       1 /*
       2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
       3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
       4  *
       5  * This code is free software; you can redistribute it and/or modify it
       6  * under the terms of the GNU General Public License version 2 only, as
       7  * published by the Free Software Foundation.
       8  *
       9  * This code is distributed in the hope that it will be useful, but WITHOUT
      10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      12  * version 2 for more details (a copy is included in the LICENSE file that
      13  * accompanied this code).
      14  *
      15  * You should have received a copy of the GNU General Public License version
      16  * 2 along with this work; if not, write to the Free Software Foundation,
      17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
      18  *
      19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
      20  * or visit www.oracle.com if you need additional information or have any
      21  * questions.
      22  *
      23  */
      24
      25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
      26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
      27
      28 #include "utilities/debug.hpp"
      29
      30 // use this for flags that are true per default in the tiered build
      31 // but false in non-tiered builds, and vice versa
      32 #ifdef TIERED
      33 #define  trueInTiered true
      34 #define falseInTiered false
      35 #else
      36 #define  trueInTiered false
      37 #define falseInTiered true
      38 #endif
      39
      40 #ifdef TARGET_ARCH_x86
      41 # include "globals_x86.hpp"
      42 #endif
      43 #ifdef TARGET_ARCH_sparc
      44 # include "globals_sparc.hpp"
      45 #endif
      46 #ifdef TARGET_ARCH_zero
      47 # include "globals_zero.hpp"
      48 #endif
      49 #ifdef TARGET_ARCH_arm
      50 # include "globals_arm.hpp"
      51 #endif
      52 #ifdef TARGET_ARCH_ppc
      53 # include "globals_ppc.hpp"
      54 #endif
      55 #ifdef TARGET_OS_FAMILY_linux
      56 # include "globals_linux.hpp"
      57 #endif
      58 #ifdef TARGET_OS_FAMILY_solaris
      59 # include "globals_solaris.hpp"
      60 #endif
      61 #ifdef TARGET_OS_FAMILY_windows
      62 # include "globals_windows.hpp"
      63 #endif
      64 #ifdef TARGET_OS_FAMILY_aix
      65 # include "globals_aix.hpp"
      66 #endif
      67 #ifdef TARGET_OS_FAMILY_bsd
      68 # include "globals_bsd.hpp"
      69 #endif
      70 #ifdef TARGET_OS_ARCH_linux_x86
      71 # include "globals_linux_x86.hpp"
      72 #endif
      73 #ifdef TARGET_OS_ARCH_linux_sparc
      74 # include "globals_linux_sparc.hpp"
      75 #endif
      76 #ifdef TARGET_OS_ARCH_linux_zero
      77 # include "globals_linux_zero.hpp"
      78 #endif
      79 #ifdef TARGET_OS_ARCH_solaris_x86
      80 # include "globals_solaris_x86.hpp"
      81 #endif
      82 #ifdef TARGET_OS_ARCH_solaris_sparc
      83 # include "globals_solaris_sparc.hpp"
      84 #endif
      85 #ifdef TARGET_OS_ARCH_windows_x86
      86 # include "globals_windows_x86.hpp"
      87 #endif
      88 #ifdef TARGET_OS_ARCH_linux_arm
      89 # include "globals_linux_arm.hpp"
      90 #endif
      91 #ifdef TARGET_OS_ARCH_linux_ppc
      92 # include "globals_linux_ppc.hpp"
      93 #endif
      94 #ifdef TARGET_OS_ARCH_aix_ppc
      95 # include "globals_aix_ppc.hpp"
      96 #endif
      97 #ifdef TARGET_OS_ARCH_bsd_x86
      98 # include "globals_bsd_x86.hpp"
      99 #endif
     100 #ifdef TARGET_OS_ARCH_bsd_zero
     101 # include "globals_bsd_zero.hpp"
     102 #endif
     103 #ifdef COMPILER1
     104 #ifdef TARGET_ARCH_x86
     105 # include "c1_globals_x86.hpp"
     106 #endif
     107 #ifdef TARGET_ARCH_sparc
     108 # include "c1_globals_sparc.hpp"
     109 #endif
     110 #ifdef TARGET_ARCH_arm
     111 # include "c1_globals_arm.hpp"
     112 #endif
     113 #ifdef TARGET_ARCH_ppc
     114 # include "c1_globals_ppc.hpp"
     115 #endif
     116 #ifdef TARGET_OS_FAMILY_linux
     117 # include "c1_globals_linux.hpp"
     118 #endif
     119 #ifdef TARGET_OS_FAMILY_solaris
     120 # include "c1_globals_solaris.hpp"
     121 #endif
     122 #ifdef TARGET_OS_FAMILY_windows
     123 # include "c1_globals_windows.hpp"
     124 #endif
     125 #ifdef TARGET_OS_FAMILY_aix
     126 # include "c1_globals_aix.hpp"
     127 #endif
     128 #ifdef TARGET_OS_FAMILY_bsd
     129 # include "c1_globals_bsd.hpp"
     130 #endif
     131 #endif
     132 #ifdef COMPILER2
     133 #ifdef TARGET_ARCH_x86
     134 # include "c2_globals_x86.hpp"
     135 #endif
     136 #ifdef TARGET_ARCH_sparc
     137 # include "c2_globals_sparc.hpp"
     138 #endif
     139 #ifdef TARGET_ARCH_arm
     140 # include "c2_globals_arm.hpp"
     141 #endif
     142 #ifdef TARGET_ARCH_ppc
     143 # include "c2_globals_ppc.hpp"
     144 #endif
     145 #ifdef TARGET_OS_FAMILY_linux
     146 # include "c2_globals_linux.hpp"
     147 #endif
     148 #ifdef TARGET_OS_FAMILY_solaris
     149 # include "c2_globals_solaris.hpp"
     150 #endif
     151 #ifdef TARGET_OS_FAMILY_windows
     152 # include "c2_globals_windows.hpp"
     153 #endif
     154 #ifdef TARGET_OS_FAMILY_aix
     155 # include "c2_globals_aix.hpp"
     156 #endif
     157 #ifdef TARGET_OS_FAMILY_bsd
     158 # include "c2_globals_bsd.hpp"
     159 #endif
     160 #endif
     161 #ifdef SHARK
     162 #ifdef TARGET_ARCH_zero
     163 # include "shark_globals_zero.hpp"
     164 #endif
     165 #endif
     166
     167 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
     168 define_pd_global(bool, BackgroundCompilation,        false);
     169 define_pd_global(bool, UseTLAB,                      false);
     170 define_pd_global(bool, CICompileOSR,                 false);
     171 define_pd_global(bool, UseTypeProfile,               false);
     172 define_pd_global(bool, UseOnStackReplacement,        false);
     173 define_pd_global(bool, InlineIntrinsics,             false);
     174 define_pd_global(bool, PreferInterpreterNativeStubs, true);
     175 define_pd_global(bool, ProfileInterpreter,           false);
     176 define_pd_global(bool, ProfileTraps,                 false);
     177 define_pd_global(bool, TieredCompilation,            false);
     178
     179 define_pd_global(intx, CompileThreshold,             0);
     180 define_pd_global(intx, BackEdgeThreshold,            0);
     181
     182 define_pd_global(intx, OnStackReplacePercentage,     0);
     183 define_pd_global(bool, ResizeTLAB,                   false);
     184 define_pd_global(intx, FreqInlineSize,               0);
     185 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
     186 define_pd_global(intx, InlineClassNatives,           true);
     187 define_pd_global(intx, InlineUnsafeOps,              true);
     188 define_pd_global(intx, InitialCodeCacheSize,         160*K);
     189 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
     190 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
     191 define_pd_global(intx, CodeCacheMinBlockLength,      1);
     192 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
     193 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
     194 define_pd_global(bool, NeverActAsServerClassMachine, true);
     195 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
     196 #define CI_COMPILER_COUNT 0
     197 #else
     198
     199 #ifdef COMPILER2
     200 #define CI_COMPILER_COUNT 2
     201 #else
     202 #define CI_COMPILER_COUNT 1
     203 #endif // COMPILER2
     204
     205 #endif // no compilers
     206
     207 // string type aliases used only in this file
     208 typedef const char* ccstr;
     209 typedef const char* ccstrlist;   // represents string arguments which accumulate
     210
     211 struct Flag {
     212   enum Flags {
     213     // value origin
     214     DEFAULT          = 0,
     215     COMMAND_LINE     = 1,
     216     ENVIRON_VAR      = 2,
     217     CONFIG_FILE      = 3,
     218     MANAGEMENT       = 4,
     219     ERGONOMIC        = 5,
     220     ATTACH_ON_DEMAND = 6,
     221     INTERNAL         = 7,
     222
     223     LAST_VALUE_ORIGIN = INTERNAL,
     224     VALUE_ORIGIN_BITS = 4,
     225     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
     226
     227     // flag kind
     228     KIND_PRODUCT            = 1 << 4,
     229     KIND_MANAGEABLE         = 1 << 5,
     230     KIND_DIAGNOSTIC         = 1 << 6,
     231     KIND_EXPERIMENTAL       = 1 << 7,
     232     KIND_NOT_PRODUCT        = 1 << 8,
     233     KIND_DEVELOP            = 1 << 9,
     234     KIND_PLATFORM_DEPENDENT = 1 << 10,
     235     KIND_READ_WRITE         = 1 << 11,
     236     KIND_C1                 = 1 << 12,
     237     KIND_C2                 = 1 << 13,
     238     KIND_ARCH               = 1 << 14,
     239     KIND_SHARK              = 1 << 15,
     240     KIND_LP64_PRODUCT       = 1 << 16,
     241     KIND_COMMERCIAL         = 1 << 17,
     242
     243     KIND_MASK = ~VALUE_ORIGIN_MASK
     244   };
     245
     246   const char* _type;
     247   const char* _name;
     248   void* _addr;
     249   NOT_PRODUCT(const char* _doc;)
     250   Flags _flags;
     251
     252   // points to all Flags static array
     253   static Flag* flags;
     254
     255   // number of flags
     256   static size_t numFlags;
     257
     258   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
     259   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
     260
     261   void check_writable();
     262
     263   bool is_bool() const;
     264   bool get_bool() const;
     265   void set_bool(bool value);
     266
     267   bool is_intx() const;
     268   intx get_intx() const;
     269   void set_intx(intx value);
     270
     271   bool is_uintx() const;
     272   uintx get_uintx() const;
     273   void set_uintx(uintx value);
     274
     275   bool is_uint64_t() const;
     276   uint64_t get_uint64_t() const;
     277   void set_uint64_t(uint64_t value);
     278
     279   bool is_double() const;
     280   double get_double() const;
     281   void set_double(double value);
     282
     283   bool is_ccstr() const;
     284   bool ccstr_accumulates() const;
     285   ccstr get_ccstr() const;
     286   void set_ccstr(ccstr value);
     287
     288   Flags get_origin();
     289   void set_origin(Flags origin);
     290
     291   bool is_default();
     292   bool is_ergonomic();
     293   bool is_command_line();
     294
     295   bool is_product() const;
     296   bool is_manageable() const;
     297   bool is_diagnostic() const;
     298   bool is_experimental() const;
     299   bool is_notproduct() const;
     300   bool is_develop() const;
     301   bool is_read_write() const;
     302   bool is_commercial() const;
     303
     304   bool is_constant_in_binary() const;
     305
     306   bool is_unlocker() const;
     307   bool is_unlocked() const;
     308   bool is_writeable() const;
     309   bool is_external() const;
     310
     311   bool is_unlocker_ext() const;
     312   bool is_unlocked_ext() const;
     313   bool is_writeable_ext() const;
     314   bool is_external_ext() const;
     315
     316   void unlock_diagnostic();
     317
     318   void get_locked_message(char*, int) const;
     319   void get_locked_message_ext(char*, int) const;
     320
     321   void print_on(outputStream* st, bool withComments = false );
     322   void print_kind(outputStream* st);
     323   void print_as_flag(outputStream* st);
     324 };
     325
     326 // debug flags control various aspects of the VM and are global accessible
     327
     328 // use FlagSetting to temporarily change some debug flag
     329 // e.g. FlagSetting fs(DebugThisAndThat, true);
     330 // restored to previous value upon leaving scope
     331 class FlagSetting {
     332   bool val;
     333   bool* flag;
     334  public:
     335   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
     336   ~FlagSetting()                       { *flag = val; }
     337 };
     338
     339
     340 class CounterSetting {
     341   intx* counter;
     342  public:
     343   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
     344   ~CounterSetting()         { (*counter)--; }
     345 };
     346
     347
     348 class UIntFlagSetting {
     349   uintx val;
     350   uintx* flag;
     351  public:
     352   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
     353   ~UIntFlagSetting()                         { *flag = val; }
     354 };
     355
     356
     357 class DoubleFlagSetting {
     358   double val;
     359   double* flag;
     360  public:
     361   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
     362   ~DoubleFlagSetting()                           { *flag = val; }
     363 };
     364
     365
     366 class CommandLineFlags {
     367  public:
     368   static bool boolAt(const char* name, size_t len, bool* value);
     369   static bool boolAt(const char* name, bool* value)      { return boolAt(name, strlen(name), value); }
     370   static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
     371   static bool boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
     372
     373   static bool intxAt(const char* name, size_t len, intx* value);
     374   static bool intxAt(const char* name, intx* value)      { return intxAt(name, strlen(name), value); }
     375   static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
     376   static bool intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
     377
     378   static bool uintxAt(const char* name, size_t len, uintx* value);
     379   static bool uintxAt(const char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
     380   static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
     381   static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
     382
     383   static bool uint64_tAt(const char* name, size_t len, uint64_t* value);
     384   static bool uint64_tAt(const char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
     385   static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
     386   static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
     387
     388   static bool doubleAt(const char* name, size_t len, double* value);
     389   static bool doubleAt(const char* name, double* value)    { return doubleAt(name, strlen(name), value); }
     390   static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
     391   static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
     392
     393   static bool ccstrAt(const char* name, size_t len, ccstr* value);
     394   static bool ccstrAt(const char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
     395   // Contract:  Flag will make private copy of the incoming value.
     396   // Outgoing value is always malloc-ed, and caller MUST call free.
     397   static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
     398   static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
     399
     400   // Returns false if name is not a command line flag.
     401   static bool wasSetOnCmdline(const char* name, bool* value);
     402   static void printSetFlags(outputStream* out);
     403
     404   static void printFlags(outputStream* out, bool withComments);
     405
     406   static void verify() PRODUCT_RETURN;
     407 };
     408
     409 // use this for flags that are true by default in the debug version but
     410 // false in the optimized version, and vice versa
     411 #ifdef ASSERT
     412 #define trueInDebug  true
     413 #define falseInDebug false
     414 #else
     415 #define trueInDebug  false
     416 #define falseInDebug true
     417 #endif
     418
     419 // use this for flags that are true per default in the product build
     420 // but false in development builds, and vice versa
     421 #ifdef PRODUCT
     422 #define trueInProduct  true
     423 #define falseInProduct false
     424 #else
     425 #define trueInProduct  false
     426 #define falseInProduct true
     427 #endif
     428
     429 #ifdef JAVASE_EMBEDDED
     430 #define falseInEmbedded false
     431 #else
     432 #define falseInEmbedded true
     433 #endif
     434
     435 // develop flags are settable / visible only during development and are constant in the PRODUCT version
     436 // product flags are always settable / visible
     437 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
     438
     439 // A flag must be declared with one of the following types:
     440 // bool, intx, uintx, ccstr.
     441 // The type "ccstr" is an alias for "const char*" and is used
     442 // only in this file, because the macrology requires single-token type names.
     443
     444 // Note: Diagnostic options not meant for VM tuning or for product modes.
     445 // They are to be used for VM quality assurance or field diagnosis
     446 // of VM bugs.  They are hidden so that users will not be encouraged to
     447 // try them as if they were VM ordinary execution options.  However, they
     448 // are available in the product version of the VM.  Under instruction
     449 // from support engineers, VM customers can turn them on to collect
     450 // diagnostic information about VM problems.  To use a VM diagnostic
     451 // option, you must first specify +UnlockDiagnosticVMOptions.
     452 // (This master switch also affects the behavior of -Xprintflags.)
     453 //
     454 // experimental flags are in support of features that are not
     455 //    part of the officially supported product, but are available
     456 //    for experimenting with. They could, for example, be performance
     457 //    features that may not have undergone full or rigorous QA, but which may
     458 //    help performance in some cases and released for experimentation
     459 //    by the community of users and developers. This flag also allows one to
     460 //    be able to build a fully supported product that nonetheless also
     461 //    ships with some unsupported, lightly tested, experimental features.
     462 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
     463 //    UnlockExperimentalVMOptions flag, which allows the control and
     464 //    modification of the experimental flags.
     465 //
     466 // Nota bene: neither diagnostic nor experimental options should be used casually,
     467 //    and they are not supported on production loads, except under explicit
     468 //    direction from support engineers.
     469 //
     470 // manageable flags are writeable external product flags.
     471 //    They are dynamically writeable through the JDK management interface
     472 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
     473 //    These flags are external exported interface (see CCC).  The list of
     474 //    manageable flags can be queried programmatically through the management
     475 //    interface.
     476 //
     477 //    A flag can be made as "manageable" only if
     478 //    - the flag is defined in a CCC as an external exported interface.
     479 //    - the VM implementation supports dynamic setting of the flag.
     480 //      This implies that the VM must *always* query the flag variable
     481 //      and not reuse state related to the flag state at any given time.
     482 //    - you want the flag to be queried programmatically by the customers.
     483 //
     484 // product_rw flags are writeable internal product flags.
     485 //    They are like "manageable" flags but for internal/private use.
     486 //    The list of product_rw flags are internal/private flags which
     487 //    may be changed/removed in a future release.  It can be set
     488 //    through the management interface to get/set value
     489 //    when the name of flag is supplied.
     490 //
     491 //    A flag can be made as "product_rw" only if
     492 //    - the VM implementation supports dynamic setting of the flag.
     493 //      This implies that the VM must *always* query the flag variable
     494 //      and not reuse state related to the flag state at any given time.
     495 //
     496 // Note that when there is a need to support develop flags to be writeable,
     497 // it can be done in the same way as product_rw.
     498
     499 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
     500                                                                             \
     501   lp64_product(bool, UseCompressedOops, false,                              \
     502           "Use 32-bit object references in 64-bit VM. "                     \
     503           "lp64_product means flag is always constant in 32 bit VM")        \
     504                                                                             \
     505   lp64_product(bool, UseCompressedClassPointers, false,                     \
     506           "Use 32-bit class pointers in 64-bit VM. "                        \
     507           "lp64_product means flag is always constant in 32 bit VM")        \
     508                                                                             \
     509   notproduct(bool, CheckCompressedOops, true,                               \
     510           "Generate checks in encoding/decoding code in debug VM")          \
     511                                                                             \
     512   product_pd(uintx, HeapBaseMinAddress,                                     \
     513           "OS specific low limit for heap base address")                    \
     514                                                                             \
     515   diagnostic(bool, PrintCompressedOopsMode, false,                          \
     516           "Print compressed oops base address and encoding mode")           \
     517                                                                             \
     518   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
     519           "Default object alignment in bytes, 8 is minimum")                \
     520                                                                             \
     521   product(bool, AssumeMP, false,                                            \
     522           "Instruct the VM to assume multiple processors are available")    \
     523                                                                             \
     524   /* UseMembar is theoretically a temp flag used for memory barrier         \
     525    * removal testing.  It was supposed to be removed before FCS but has     \
     526    * been re-added (see 6401008) */                                         \
     527   product_pd(bool, UseMembar,                                               \
     528           "(Unstable) Issues membars on thread state transitions")          \
     529                                                                             \
     530   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
     531           "Clean the chunk pool asynchronously")                            \
     532                                                                             \
     533   /* Temporary: See 6948537 */                                              \
     534   experimental(bool, UseMemSetInBOT, true,                                  \
     535           "(Unstable) uses memset in BOT updates in GC code")               \
     536                                                                             \
     537   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
     538           "Enable normal processing of flags relating to field diagnostics")\
     539                                                                             \
     540   experimental(bool, UnlockExperimentalVMOptions, false,                    \
     541           "Enable normal processing of flags relating to experimental "     \
     542           "features")                                                       \
     543                                                                             \
     544   product(bool, JavaMonitorsInStackTrace, true,                             \
     545           "Print information about Java monitor locks when the stacks are"  \
     546           "dumped")                                                         \
     547                                                                             \
     548   product_pd(bool, UseLargePages,                                           \
     549           "Use large page memory")                                          \
     550                                                                             \
     551   product_pd(bool, UseLargePagesIndividualAllocation,                       \
     552           "Allocate large pages individually for better affinity")          \
     553                                                                             \
     554   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
     555           "Fail large pages individual allocation")                         \
     556                                                                             \
     557   product(bool, UseLargePagesInMetaspace, false,                            \
     558           "Use large page memory in metaspace. "                            \
     559           "Only used if UseLargePages is enabled.")                         \
     560                                                                             \
     561   develop(bool, TracePageSizes, false,                                      \
     562           "Trace page size selection and usage")                            \
     563                                                                             \
     564   product(bool, UseNUMA, false,                                             \
     565           "Use NUMA if available")                                          \
     566                                                                             \
     567   product(bool, UseNUMAInterleaving, false,                                 \
     568           "Interleave memory across NUMA nodes if available")               \
     569                                                                             \
     570   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
     571           "Granularity to use for NUMA interleaving on Windows OS")         \
     572                                                                             \
     573   product(bool, ForceNUMA, false,                                           \
     574           "Force NUMA optimizations on single-node/UMA systems")            \
     575                                                                             \
     576   product(uintx, NUMAChunkResizeWeight, 20,                                 \
     577           "Percentage (0-100) used to weigh the current sample when "       \
     578           "computing exponentially decaying average for "                   \
     579           "AdaptiveNUMAChunkSizing")                                        \
     580                                                                             \
     581   product(uintx, NUMASpaceResizeRate, 1*G,                                  \
     582           "Do not reallocate more than this amount per collection")         \
     583                                                                             \
     584   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
     585           "Enable adaptive chunk sizing for NUMA")                          \
     586                                                                             \
     587   product(bool, NUMAStats, false,                                           \
     588           "Print NUMA stats in detailed heap information")                  \
     589                                                                             \
     590   product(uintx, NUMAPageScanRate, 256,                                     \
     591           "Maximum number of pages to include in the page scan procedure")  \
     592                                                                             \
     593   product_pd(bool, NeedsDeoptSuspend,                                       \
     594           "True for register window machines (sparc/ia64)")                 \
     595                                                                             \
     596   product(intx, UseSSE, 99,                                                 \
     597           "Highest supported SSE instructions set on x86/x64")              \
     598                                                                             \
     599   product(bool, UseAES, false,                                              \
     600           "Control whether AES instructions can be used on x86/x64")        \
     601                                                                             \
     602   product(bool, UseSHA, false,                                              \
     603           "Control whether SHA instructions can be used on SPARC")          \
     604                                                                             \
     605   product(uintx, LargePageSizeInBytes, 0,                                   \
     606           "Large page size (0 to let VM choose the page size)")             \
     607                                                                             \
     608   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
     609           "Use large pages if maximum heap is at least this big")           \
     610                                                                             \
     611   product(bool, ForceTimeHighResolution, false,                             \
     612           "Using high time resolution (for Win32 only)")                    \
     613                                                                             \
     614   develop(bool, TraceItables, false,                                        \
     615           "Trace initialization and use of itables")                        \
     616                                                                             \
     617   develop(bool, TracePcPatching, false,                                     \
     618           "Trace usage of frame::patch_pc")                                 \
     619                                                                             \
     620   develop(bool, TraceJumps, false,                                          \
     621           "Trace assembly jumps in thread ring buffer")                     \
     622                                                                             \
     623   develop(bool, TraceRelocator, false,                                      \
     624           "Trace the bytecode relocator")                                   \
     625                                                                             \
     626   develop(bool, TraceLongCompiles, false,                                   \
     627           "Print out every time compilation is longer than "                \
     628           "a given threshold")                                              \
     629                                                                             \
     630   develop(bool, SafepointALot, false,                                       \
     631           "Generate a lot of safepoints. This works with "                  \
     632           "GuaranteedSafepointInterval")                                    \
     633                                                                             \
     634   product_pd(bool, BackgroundCompilation,                                   \
     635           "A thread requesting compilation is not blocked during "          \
     636           "compilation")                                                    \
     637                                                                             \
     638   product(bool, PrintVMQWaitTime, false,                                    \
     639           "Print out the waiting time in VM operation queue")               \
     640                                                                             \
     641   develop(bool, NoYieldsInMicrolock, false,                                 \
     642           "Disable yields in microlock")                                    \
     643                                                                             \
     644   develop(bool, TraceOopMapGeneration, false,                               \
     645           "Show OopMapGeneration")                                          \
     646                                                                             \
     647   product(bool, MethodFlushing, true,                                       \
     648           "Reclamation of zombie and not-entrant methods")                  \
     649                                                                             \
     650   develop(bool, VerifyStack, false,                                         \
     651           "Verify stack of each thread when it is entering a runtime call") \
     652                                                                             \
     653   diagnostic(bool, ForceUnreachable, false,                                 \
     654           "Make all non code cache addresses to be unreachable by "         \
     655           "forcing use of 64bit literal fixups")                            \
     656                                                                             \
     657   notproduct(bool, StressDerivedPointers, false,                            \
     658           "Force scavenge when a derived pointer is detected on stack "     \
     659           "after rtm call")                                                 \
     660                                                                             \
     661   develop(bool, TraceDerivedPointers, false,                                \
     662           "Trace traversal of derived pointers on stack")                   \
     663                                                                             \
     664   notproduct(bool, TraceCodeBlobStacks, false,                              \
     665           "Trace stack-walk of codeblobs")                                  \
     666                                                                             \
     667   product(bool, PrintJNIResolving, false,                                   \
     668           "Used to implement -v:jni")                                       \
     669                                                                             \
     670   notproduct(bool, PrintRewrites, false,                                    \
     671           "Print methods that are being rewritten")                         \
     672                                                                             \
     673   product(bool, UseInlineCaches, true,                                      \
     674           "Use Inline Caches for virtual calls ")                           \
     675                                                                             \
     676   develop(bool, InlineArrayCopy, true,                                      \
     677           "Inline arraycopy native that is known to be part of "            \
     678           "base library DLL")                                               \
     679                                                                             \
     680   develop(bool, InlineObjectHash, true,                                     \
     681           "Inline Object::hashCode() native that is known to be part "      \
     682           "of base library DLL")                                            \
     683                                                                             \
     684   develop(bool, InlineNatives, true,                                        \
     685           "Inline natives that are known to be part of base library DLL")   \
     686                                                                             \
     687   develop(bool, InlineMathNatives, true,                                    \
     688           "Inline SinD, CosD, etc.")                                        \
     689                                                                             \
     690   develop(bool, InlineClassNatives, true,                                   \
     691           "Inline Class.isInstance, etc")                                   \
     692                                                                             \
     693   develop(bool, InlineThreadNatives, true,                                  \
     694           "Inline Thread.currentThread, etc")                               \
     695                                                                             \
     696   develop(bool, InlineUnsafeOps, true,                                      \
     697           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
     698                                                                             \
     699   product(bool, CriticalJNINatives, true,                                   \
     700           "Check for critical JNI entry points")                            \
     701                                                                             \
     702   notproduct(bool, StressCriticalJNINatives, false,                         \
     703           "Exercise register saving code in critical natives")              \
     704                                                                             \
     705   product(bool, UseSSE42Intrinsics, false,                                  \
     706           "SSE4.2 versions of intrinsics")                                  \
     707                                                                             \
     708   product(bool, UseAESIntrinsics, false,                                    \
     709           "Use intrinsics for AES versions of crypto")                      \
     710                                                                             \
     711   product(bool, UseSHA1Intrinsics, false,                                   \
     712           "Use intrinsics for SHA-1 crypto hash function")                  \
     713                                                                             \
     714   product(bool, UseSHA256Intrinsics, false,                                 \
     715           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions")   \
     716                                                                             \
     717   product(bool, UseSHA512Intrinsics, false,                                 \
     718           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions")   \
     719                                                                             \
     720   product(bool, UseCRC32Intrinsics, false,                                  \
     721           "use intrinsics for java.util.zip.CRC32")                         \
     722                                                                             \
     723   develop(bool, TraceCallFixup, false,                                      \
     724           "Trace all call fixups")                                          \
     725                                                                             \
     726   develop(bool, DeoptimizeALot, false,                                      \
     727           "Deoptimize at every exit from the runtime system")               \
     728                                                                             \
     729   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
     730           "A comma separated list of bcis to deoptimize at")                \
     731                                                                             \
     732   product(bool, DeoptimizeRandom, false,                                    \
     733           "Deoptimize random frames on random exit from the runtime system")\
     734                                                                             \
     735   notproduct(bool, ZombieALot, false,                                       \
     736           "Create zombies (non-entrant) at exit from the runtime system")   \
     737                                                                             \
     738   product(bool, UnlinkSymbolsALot, false,                                   \
     739           "Unlink unreferenced symbols from the symbol table at safepoints")\
     740                                                                             \
     741   notproduct(bool, WalkStackALot, false,                                    \
     742           "Trace stack (no print) at every exit from the runtime system")   \
     743                                                                             \
     744   product(bool, Debugging, false,                                           \
     745           "Set when executing debug methods in debug.cpp "                  \
     746           "(to prevent triggering assertions)")                             \
     747                                                                             \
     748   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
     749           "Enable strict checks that safepoints cannot happen for threads " \
     750           "that use No_Safepoint_Verifier")                                 \
     751                                                                             \
     752   notproduct(bool, VerifyLastFrame, false,                                  \
     753           "Verify oops on last frame on entry to VM")                       \
     754                                                                             \
     755   develop(bool, TraceHandleAllocation, false,                               \
     756           "Print out warnings when suspiciously many handles are allocated")\
     757                                                                             \
     758   product(bool, UseCompilerSafepoints, true,                                \
     759           "Stop at safepoints in compiled code")                            \
     760                                                                             \
     761   product(bool, FailOverToOldVerifier, true,                                \
     762           "Fail over to old verifier when split verifier fails")            \
     763                                                                             \
     764   develop(bool, ShowSafepointMsgs, false,                                   \
     765           "Show message about safepoint synchronization")                   \
     766                                                                             \
     767   product(bool, SafepointTimeout, false,                                    \
     768           "Time out and warn or fail after SafepointTimeoutDelay "          \
     769           "milliseconds if failed to reach safepoint")                      \
     770                                                                             \
     771   develop(bool, DieOnSafepointTimeout, false,                               \
     772           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
     773                                                                             \
     774   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
     775   /* typically, at most a few retries are needed */                         \
     776   product(intx, SuspendRetryCount, 50,                                      \
     777           "Maximum retry count for an external suspend request")            \
     778                                                                             \
     779   product(intx, SuspendRetryDelay, 5,                                       \
     780           "Milliseconds to delay per retry (* current_retry_count)")        \
     781                                                                             \
     782   product(bool, AssertOnSuspendWaitFailure, false,                          \
     783           "Assert/Guarantee on external suspend wait failure")              \
     784                                                                             \
     785   product(bool, TraceSuspendWaitFailures, false,                            \
     786           "Trace external suspend wait failures")                           \
     787                                                                             \
     788   product(bool, MaxFDLimit, true,                                           \
     789           "Bump the number of file descriptors to maximum in Solaris")      \
     790                                                                             \
     791   diagnostic(bool, LogEvents, true,                                         \
     792           "Enable the various ring buffer event logs")                      \
     793                                                                             \
     794   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
     795           "Number of ring buffer event logs")                               \
     796                                                                             \
     797   product(bool, BytecodeVerificationRemote, true,                           \
     798           "Enable the Java bytecode verifier for remote classes")           \
     799                                                                             \
     800   product(bool, BytecodeVerificationLocal, false,                           \
     801           "Enable the Java bytecode verifier for local classes")            \
     802                                                                             \
     803   develop(bool, ForceFloatExceptions, trueInDebug,                          \
     804           "Force exceptions on FP stack under/overflow")                    \
     805                                                                             \
     806   develop(bool, VerifyStackAtCalls, false,                                  \
     807           "Verify that the stack pointer is unchanged after calls")         \
     808                                                                             \
     809   develop(bool, TraceJavaAssertions, false,                                 \
     810           "Trace java language assertions")                                 \
     811                                                                             \
     812   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
     813           "Temporary - see javaClasses.cpp")                                \
     814                                                                             \
     815   notproduct(bool, PrintMallocFree, false,                                  \
     816           "Trace calls to C heap malloc/free allocation")                   \
     817                                                                             \
     818   product(bool, PrintOopAddress, false,                                     \
     819           "Always print the location of the oop")                           \
     820                                                                             \
     821   notproduct(bool, VerifyCodeCacheOften, false,                             \
     822           "Verify compiled-code cache often")                               \
     823                                                                             \
     824   develop(bool, ZapDeadCompiledLocals, false,                               \
     825           "Zap dead locals in compiler frames")                             \
     826                                                                             \
     827   notproduct(bool, ZapDeadLocalsOld, false,                                 \
     828           "Zap dead locals (old version, zaps all frames when "             \
     829           "entering the VM")                                                \
     830                                                                             \
     831   notproduct(bool, CheckOopishValues, false,                                \
     832           "Warn if value contains oop (requires ZapDeadLocals)")            \
     833                                                                             \
     834   develop(bool, UseMallocOnly, false,                                       \
     835           "Use only malloc/free for allocation (no resource area/arena)")   \
     836                                                                             \
     837   develop(bool, PrintMalloc, false,                                         \
     838           "Print all malloc/free calls")                                    \
     839                                                                             \
     840   develop(bool, PrintMallocStatistics, false,                               \
     841           "Print malloc/free statistics")                                   \
     842                                                                             \
     843   develop(bool, ZapResourceArea, trueInDebug,                               \
     844           "Zap freed resource/arena space with 0xABABABAB")                 \
     845                                                                             \
     846   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
     847           "Zap freed VM handle space with 0xBCBCBCBC")                      \
     848                                                                             \
     849   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
     850           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
     851                                                                             \
     852   notproduct(bool, ZapStackSegments, trueInDebug,                           \
     853           "Zap allocated/freed stack segments with 0xFADFADED")             \
     854                                                                             \
     855   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
     856           "Zap unused heap space with 0xBAADBABE")                          \
     857                                                                             \
     858   develop(bool, TraceZapUnusedHeapArea, false,                              \
     859           "Trace zapping of unused heap space")                             \
     860                                                                             \
     861   develop(bool, CheckZapUnusedHeapArea, false,                              \
     862           "Check zapping of unused heap space")                             \
     863                                                                             \
     864   develop(bool, ZapFillerObjects, trueInDebug,                              \
     865           "Zap filler objects with 0xDEAFBABE")                             \
     866                                                                             \
     867   develop(bool, PrintVMMessages, true,                                      \
     868           "Print VM messages on console")                                   \
     869                                                                             \
     870   product(bool, PrintGCApplicationConcurrentTime, false,                    \
     871           "Print the time the application has been running")                \
     872                                                                             \
     873   product(bool, PrintGCApplicationStoppedTime, false,                       \
     874           "Print the time the application has been stopped")                \
     875                                                                             \
     876   diagnostic(bool, VerboseVerification, false,                              \
     877           "Display detailed verification details")                          \
     878                                                                             \
     879   notproduct(uintx, ErrorHandlerTest, 0,                                    \
     880           "If > 0, provokes an error after VM initialization; the value "   \
     881           "determines which error to provoke. See test_error_handler() "    \
     882           "in debug.cpp.")                                                  \
     883                                                                             \
     884   develop(bool, Verbose, false,                                             \
     885           "Print additional debugging information from other modes")        \
     886                                                                             \
     887   develop(bool, PrintMiscellaneous, false,                                  \
     888           "Print uncategorized debugging information (requires +Verbose)")  \
     889                                                                             \
     890   develop(bool, WizardMode, false,                                          \
     891           "Print much more debugging information")                          \
     892                                                                             \
     893   product(bool, ShowMessageBoxOnError, false,                               \
     894           "Keep process alive on VM fatal error")                           \
     895                                                                             \
     896   product(bool, CreateMinidumpOnCrash, false,                               \
     897           "Create minidump on VM fatal error")                              \
     898                                                                             \
     899   product_pd(bool, UseOSErrorReporting,                                     \
     900           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
     901                                                                             \
     902   product(bool, SuppressFatalErrorMessage, false,                           \
     903           "Report NO fatal error message (avoid deadlock)")                 \
     904                                                                             \
     905   product(ccstrlist, OnError, "",                                           \
     906           "Run user-defined commands on fatal error; see VMError.cpp "      \
     907           "for examples")                                                   \
     908                                                                             \
     909   product(ccstrlist, OnOutOfMemoryError, "",                                \
     910           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
     911                                                                             \
     912   manageable(bool, HeapDumpBeforeFullGC, false,                             \
     913           "Dump heap to file before any major stop-the-world GC")           \
     914                                                                             \
     915   manageable(bool, HeapDumpAfterFullGC, false,                              \
     916           "Dump heap to file after any major stop-the-world GC")            \
     917                                                                             \
     918   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
     919           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
     920                                                                             \
     921   manageable(ccstr, HeapDumpPath, NULL,                                     \
     922           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
     923           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
     924           "in the working directory)")                                      \
     925                                                                             \
     926   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
     927           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
     928           "when the heap usage is larger than this")                        \
     929                                                                             \
     930   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
     931           "Approximate segment size when generating a segmented heap dump") \
     932                                                                             \
     933   develop(bool, BreakAtWarning, false,                                      \
     934           "Execute breakpoint upon encountering VM warning")                \
     935                                                                             \
     936   develop(bool, TraceVMOperation, false,                                    \
     937           "Trace VM operations")                                            \
     938                                                                             \
     939   develop(bool, UseFakeTimers, false,                                       \
     940           "Tell whether the VM should use system time or a fake timer")     \
     941                                                                             \
     942   product(ccstr, NativeMemoryTracking, "off",                               \
     943           "Native memory tracking options")                                 \
     944                                                                             \
     945   diagnostic(bool, PrintNMTStatistics, false,                               \
     946           "Print native memory tracking summary data if it is on")          \
     947                                                                             \
     948   diagnostic(bool, LogCompilation, false,                                   \
     949           "Log compilation activity in detail to LogFile")                  \
     950                                                                             \
     951   product(bool, PrintCompilation, false,                                    \
     952           "Print compilations")                                             \
     953                                                                             \
     954   diagnostic(bool, TraceNMethodInstalls, false,                             \
     955           "Trace nmethod installation")                                     \
     956                                                                             \
     957   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
     958           "0: do not allow scavengable oops in the code cache; "            \
     959           "1: allow scavenging from the code cache; "                       \
     960           "2: emit as many constants as the compiler can see")              \
     961                                                                             \
     962   product(bool, AlwaysRestoreFPU, false,                                    \
     963           "Restore the FPU control word after every JNI call (expensive)")  \
     964                                                                             \
     965   diagnostic(bool, PrintCompilation2, false,                                \
     966           "Print additional statistics per compilation")                    \
     967                                                                             \
     968   diagnostic(bool, PrintAdapterHandlers, false,                             \
     969           "Print code generated for i2c/c2i adapters")                      \
     970                                                                             \
     971   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
     972           "Verify that i2c/c2i adapters are called properly")               \
     973                                                                             \
     974   develop(bool, VerifyAdapterSharing, false,                                \
     975           "Verify that the code for shared adapters is the equivalent")     \
     976                                                                             \
     977   diagnostic(bool, PrintAssembly, false,                                    \
     978           "Print assembly code (using external disassembler.so)")           \
     979                                                                             \
     980   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
     981           "Print options string passed to disassembler.so")                 \
     982                                                                             \
     983   diagnostic(bool, PrintNMethods, false,                                    \
     984           "Print assembly code for nmethods when generated")                \
     985                                                                             \
     986   diagnostic(bool, PrintNativeNMethods, false,                              \
     987           "Print assembly code for native nmethods when generated")         \
     988                                                                             \
     989   develop(bool, PrintDebugInfo, false,                                      \
     990           "Print debug information for all nmethods when generated")        \
     991                                                                             \
     992   develop(bool, PrintRelocations, false,                                    \
     993           "Print relocation information for all nmethods when generated")   \
     994                                                                             \
     995   develop(bool, PrintDependencies, false,                                   \
     996           "Print dependency information for all nmethods when generated")   \
     997                                                                             \
     998   develop(bool, PrintExceptionHandlers, false,                              \
     999           "Print exception handler tables for all nmethods when generated") \
    1000                                                                             \
    1001   develop(bool, StressCompiledExceptionHandlers, false,                     \
    1002           "Exercise compiled exception handlers")                           \
    1003                                                                             \
    1004   develop(bool, InterceptOSException, false,                                \
    1005           "Start debugger when an implicit OS (e.g. NULL) "                 \
    1006           "exception happens")                                              \
    1007                                                                             \
    1008   product(bool, PrintCodeCache, false,                                      \
    1009           "Print the code cache memory usage when exiting")                 \
    1010                                                                             \
    1011   develop(bool, PrintCodeCache2, false,                                     \
    1012           "Print detailed usage information on the code cache when exiting")\
    1013                                                                             \
    1014   product(bool, PrintCodeCacheOnCompilation, false,                         \
    1015           "Print the code cache memory usage each time a method is "        \
    1016           "compiled")                                                       \
    1017                                                                             \
    1018   diagnostic(bool, PrintStubCode, false,                                    \
    1019           "Print generated stub code")                                      \
    1020                                                                             \
    1021   product(bool, StackTraceInThrowable, true,                                \
    1022           "Collect backtrace in throwable when exception happens")          \
    1023                                                                             \
    1024   product(bool, OmitStackTraceInFastThrow, true,                            \
    1025           "Omit backtraces for some 'hot' exceptions in optimized code")    \
    1026                                                                             \
    1027   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
    1028           "Print bytecode statistics when dumping profiler output")         \
    1029                                                                             \
    1030   product(bool, ProfilerRecordPC, false,                                    \
    1031           "Collect ticks for each 16 byte interval of compiled code")       \
    1032                                                                             \
    1033   product(bool, ProfileVM, false,                                           \
    1034           "Profile ticks that fall within VM (either in the VM Thread "     \
    1035           "or VM code called through stubs)")                               \
    1036                                                                             \
    1037   product(bool, ProfileIntervals, false,                                    \
    1038           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
    1039                                                                             \
    1040   notproduct(bool, ProfilerCheckIntervals, false,                           \
    1041           "Collect and print information on spacing of profiler ticks")     \
    1042                                                                             \
    1043   develop(bool, PrintJVMWarnings, false,                                    \
    1044           "Print warnings for unimplemented JVM functions")                 \
    1045                                                                             \
    1046   product(bool, PrintWarnings, true,                                        \
    1047           "Print JVM warnings to output stream")                            \
    1048                                                                             \
    1049   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
    1050           "Print warnings for stalled SpinLocks")                           \
    1051                                                                             \
    1052   product(bool, RegisterFinalizersAtInit, true,                             \
    1053           "Register finalizable objects at end of Object.<init> or "        \
    1054           "after allocation")                                               \
    1055                                                                             \
    1056   develop(bool, RegisterReferences, true,                                   \
    1057           "Tell whether the VM should register soft/weak/final/phantom "    \
    1058           "references")                                                     \
    1059                                                                             \
    1060   develop(bool, IgnoreRewrites, false,                                      \
    1061           "Suppress rewrites of bytecodes in the oopmap generator. "        \
    1062           "This is unsafe!")                                                \
    1063                                                                             \
    1064   develop(bool, PrintCodeCacheExtension, false,                             \
    1065           "Print extension of code cache")                                  \
    1066                                                                             \
    1067   develop(bool, UsePrivilegedStack, true,                                   \
    1068           "Enable the security JVM functions")                              \
    1069                                                                             \
    1070   develop(bool, ProtectionDomainVerification, true,                         \
    1071           "Verify protection domain before resolution in system dictionary")\
    1072                                                                             \
    1073   product(bool, ClassUnloading, true,                                       \
    1074           "Do unloading of classes")                                        \
    1075                                                                             \
    1076   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
    1077           "Do unloading of classes with a concurrent marking cycle")        \
    1078                                                                             \
    1079   develop(bool, DisableStartThread, false,                                  \
    1080           "Disable starting of additional Java threads "                    \
    1081           "(for debugging only)")                                           \
    1082                                                                             \
    1083   develop(bool, MemProfiling, false,                                        \
    1084           "Write memory usage profiling to log file")                       \
    1085                                                                             \

    1086   diagnostic(bool, UnsyncloadClass, false,                                  \
    1087           "Unstable: VM calls loadClass unsynchronized. Custom "            \
    1088           "class loader must call VM synchronized for findClass "           \
    1089           "and defineClass.")                                               \
    1090                                                                             \
    1091   product(bool, AlwaysLockClassLoader, false,                               \
    1092           "Require the VM to acquire the class loader lock before calling " \
    1093           "loadClass() even for class loaders registering "                 \
    1094           "as parallel capable")                                            \
    1095                                                                             \
    1096   product(bool, AllowParallelDefineClass, false,                            \
    1097           "Allow parallel defineClass requests for class loaders "          \
    1098           "registering as parallel capable")                                \
    1099                                                                             \
    1100   product(bool, MustCallLoadClassInternal, false,                           \
    1101           "Call loadClassInternal() rather than loadClass()")               \
    1102                                                                             \
    1103   product_pd(bool, DontYieldALot,                                           \
    1104           "Throw away obvious excess yield calls (for Solaris only)")       \
    1105                                                                             \
    1106   product_pd(bool, ConvertSleepToYield,                                     \
    1107           "Convert sleep(0) to thread yield "                               \
    1108           "(may be off for Solaris to improve GUI)")                        \
    1109                                                                             \
    1110   product(bool, ConvertYieldToSleep, false,                                 \
    1111           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
    1112           "behavior (Solaris only)")                                        \
    1113                                                                             \
    1114   product(bool, UseBoundThreads, true,                                      \
    1115           "Bind user level threads to kernel threads (for Solaris only)")   \
    1116                                                                             \
    1117   develop(bool, UseDetachedThreads, true,                                   \
    1118           "Use detached threads that are recycled upon termination "        \
    1119           "(for Solaris only)")                                             \
    1120                                                                             \
    1121   product(bool, UseLWPSynchronization, true,                                \
    1122           "Use LWP-based instead of libthread-based synchronization "       \
    1123           "(SPARC only)")                                                   \
    1124                                                                             \
    1125   product(ccstr, SyncKnobs, NULL,                                           \
    1126           "(Unstable) Various monitor synchronization tunables")            \
    1127                                                                             \
    1128   product(intx, EmitSync, 0,                                                \
    1129           "(Unsafe, Unstable) "                                             \
    1130           "Control emission of inline sync fast-path code")                 \
    1131                                                                             \
    1132   product(intx, MonitorBound, 0, "Bound Monitor population")                \
    1133                                                                             \
    1134   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
    1135                                                                             \
    1136   product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
    1137                                                                             \
    1138   product(intx, SyncVerbose, 0, "(Unstable)")                               \
    1139                                                                             \
    1140   product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")                    \
    1141                                                                             \
    1142   product(intx, hashCode, 5,                                                \
    1143           "(Unstable) select hashCode generation algorithm")                \
    1144                                                                             \
    1145   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
    1146           "(Unstable, Linux-specific) "                                     \
    1147           "avoid NPTL-FUTEX hang pthread_cond_timedwait")                   \
    1148                                                                             \
    1149   product(bool, FilterSpuriousWakeups, true,                                \
    1150           "Prevent spurious or premature wakeups from object.wait "         \
    1151           "(Solaris only)")                                                 \
    1152                                                                             \
    1153   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
    1154                                                                             \
    1155   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
    1156                                                                             \
    1157   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
    1158                                                                             \
    1159   develop(bool, UsePthreads, false,                                         \
    1160           "Use pthread-based instead of libthread-based synchronization "   \
    1161           "(SPARC only)")                                                   \
    1162                                                                             \
    1163   product(bool, AdjustConcurrency, false,                                   \
    1164           "Call thr_setconcurrency at thread creation time to avoid "       \
    1165           "LWP starvation on MP systems (for Solaris Only)")                \
    1166                                                                             \
    1167   product(bool, ReduceSignalUsage, false,                                   \
    1168           "Reduce the use of OS signals in Java and/or the VM")             \
    1169                                                                             \
    1170   develop_pd(bool, ShareVtableStubs,                                        \
    1171           "Share vtable stubs (smaller code but worse branch prediction")   \
    1172                                                                             \
    1173   develop(bool, LoadLineNumberTables, true,                                 \
    1174           "Tell whether the class file parser loads line number tables")    \
    1175                                                                             \
    1176   develop(bool, LoadLocalVariableTables, true,                              \
    1177           "Tell whether the class file parser loads local variable tables") \
    1178                                                                             \
    1179   develop(bool, LoadLocalVariableTypeTables, true,                          \
    1180           "Tell whether the class file parser loads local variable type"    \
    1181           "tables")                                                         \
    1182                                                                             \
    1183   product(bool, AllowUserSignalHandlers, false,                             \
    1184           "Do not complain if the application installs signal handlers "    \
    1185           "(Solaris & Linux only)")                                         \
    1186                                                                             \
    1187   product(bool, UseSignalChaining, true,                                    \
    1188           "Use signal-chaining to invoke signal handlers installed "        \
    1189           "by the application (Solaris & Linux only)")                      \
    1190                                                                             \
    1191   product(bool, UseAltSigs, false,                                          \
    1192           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
    1193           "internal signals (Solaris only)")                                \
    1194                                                                             \
    1195   product(bool, AllowJNIEnvProxy, false,                                    \
    1196           "Allow JNIEnv proxies for jdbx")                                  \
    1197                                                                             \
    1198   product(bool, JNIDetachReleasesMonitors, true,                            \
    1199           "JNI DetachCurrentThread releases monitors owned by thread")      \
    1200                                                                             \
    1201   product(bool, RestoreMXCSROnJNICalls, false,                              \
    1202           "Restore MXCSR when returning from JNI calls")                    \
    1203                                                                             \
    1204   product(bool, CheckJNICalls, false,                                       \
    1205           "Verify all arguments to JNI calls")                              \
    1206                                                                             \
    1207   product(bool, CheckEndorsedAndExtDirs, false,                             \
    1208           "Verify the endorsed and extension directories are not used")     \
    1209                                                                             \
    1210   product(bool, UseFastJNIAccessors, true,                                  \
    1211           "Use optimized versions of Get<Primitive>Field")                  \
    1212                                                                             \
    1213   product(intx, MaxJNILocalCapacity, 65536,                                 \
    1214           "Maximum allowable local JNI handle capacity to "                 \
    1215           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
    1216           "where <= 0 is unlimited, default: 65536")                        \
    1217                                                                             \
    1218   product(bool, EagerXrunInit, false,                                       \
    1219           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
    1220           "but not all -Xrun libraries may support the state of the VM "    \
    1221           "at this time")                                                   \
    1222                                                                             \
    1223   product(bool, PreserveAllAnnotations, false,                              \
    1224           "Preserve RuntimeInvisibleAnnotations as well "                   \
    1225           "as RuntimeVisibleAnnotations")                                   \
    1226                                                                             \
    1227   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
    1228           "Number of OutOfMemoryErrors preallocated with backtrace")        \
    1229                                                                             \
    1230   product(bool, LazyBootClassLoader, true,                                  \
    1231           "Enable/disable lazy opening of boot class path entries")         \
    1232                                                                             \
    1233   product(bool, UseXMMForArrayCopy, false,                                  \
    1234           "Use SSE2 MOVQ instruction for Arraycopy")                        \
    1235                                                                             \
    1236   product(intx, FieldsAllocationStyle, 1,                                   \
    1237           "0 - type based with oops first, 1 - with oops last, "            \
    1238           "2 - oops in super and sub classes are together")                 \
    1239                                                                             \
    1240   product(bool, CompactFields, true,                                        \
    1241           "Allocate nonstatic fields in gaps between previous fields")      \
    1242                                                                             \
    1243   notproduct(bool, PrintFieldLayout, false,                                 \
    1244           "Print field layout for each class")                              \
    1245                                                                             \
    1246   product(intx, ContendedPaddingWidth, 128,                                 \
    1247           "How many bytes to pad the fields/classes marked @Contended with")\
    1248                                                                             \
    1249   product(bool, EnableContended, true,                                      \
    1250           "Enable @Contended annotation support")                           \
    1251                                                                             \
    1252   product(bool, RestrictContended, true,                                    \
    1253           "Restrict @Contended to trusted classes")                         \
    1254                                                                             \
    1255   product(bool, UseBiasedLocking, true,                                     \
    1256           "Enable biased locking in JVM")                                   \
    1257                                                                             \
    1258   product(intx, BiasedLockingStartupDelay, 4000,                            \
    1259           "Number of milliseconds to wait before enabling biased locking")  \
    1260                                                                             \
    1261   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
    1262           "Print statistics of biased locking in JVM")                      \
    1263                                                                             \
    1264   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
    1265           "Threshold of number of revocations per type to try to "          \
    1266           "rebias all objects in the heap of that type")                    \
    1267                                                                             \
    1268   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
    1269           "Threshold of number of revocations per type to permanently "     \
    1270           "revoke biases of all objects in the heap of that type")          \
    1271                                                                             \
    1272   product(intx, BiasedLockingDecayTime, 25000,                              \
    1273           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
    1274           "type after previous bulk rebias")                                \
    1275                                                                             \
    1276   /* tracing */                                                             \
    1277                                                                             \
    1278   notproduct(bool, TraceRuntimeCalls, false,                                \
    1279           "Trace run-time calls")                                           \
    1280                                                                             \
    1281   develop(bool, TraceJNICalls, false,                                       \
    1282           "Trace JNI calls")                                                \
    1283                                                                             \
    1284   develop(bool, StressRewriter, false,                                      \
    1285           "Stress linktime bytecode rewriting")                             \
    1286                                                                             \
    1287   notproduct(bool, TraceJVMCalls, false,                                    \
    1288           "Trace JVM calls")                                                \
    1289                                                                             \
    1290   product(ccstr, TraceJVMTI, NULL,                                          \
    1291           "Trace flags for JVMTI functions and events")                     \
    1292                                                                             \
    1293   /* This option can change an EMCP method into an obsolete method. */      \
    1294   /* This can affect tests that except specific methods to be EMCP. */      \
    1295   /* This option should be used with caution. */                            \
    1296   product(bool, StressLdcRewrite, false,                                    \
    1297           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
    1298                                                                             \
    1299   product(intx, TraceRedefineClasses, 0,                                    \
    1300           "Trace level for JVMTI RedefineClasses")                          \
    1301                                                                             \
    1302   develop(bool, StressMethodComparator, false,                              \
    1303           "Run the MethodComparator on all loaded methods")                 \
    1304                                                                             \
    1305   /* change to false by default sometime after Mustang */                   \
    1306   product(bool, VerifyMergedCPBytecodes, true,                              \
    1307           "Verify bytecodes after RedefineClasses constant pool merging")   \
    1308                                                                             \
    1309   develop(bool, TraceJNIHandleAllocation, false,                            \
    1310           "Trace allocation/deallocation of JNI handle blocks")             \
    1311                                                                             \
    1312   develop(bool, TraceThreadEvents, false,                                   \
    1313           "Trace all thread events")                                        \
    1314                                                                             \
    1315   develop(bool, TraceBytecodes, false,                                      \
    1316           "Trace bytecode execution")                                       \
    1317                                                                             \
    1318   develop(bool, TraceClassInitialization, false,                            \
    1319           "Trace class initialization")                                     \
    1320                                                                             \
    1321   develop(bool, TraceExceptions, false,                                     \
    1322           "Trace exceptions")                                               \
    1323                                                                             \
    1324   develop(bool, TraceICs, false,                                            \
    1325           "Trace inline cache changes")                                     \
    1326                                                                             \
    1327   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
    1328           "Trace method invocation counter overflow")                       \
    1329                                                                             \
    1330   develop(bool, TraceInlineCacheClearing, false,                            \
    1331           "Trace clearing of inline caches in nmethods")                    \
    1332                                                                             \
    1333   develop(bool, TraceDependencies, false,                                   \
    1334           "Trace dependencies")                                             \
    1335                                                                             \
    1336   develop(bool, VerifyDependencies, trueInDebug,                            \
    1337           "Exercise and verify the compilation dependency mechanism")       \
    1338                                                                             \
    1339   develop(bool, TraceNewOopMapGeneration, false,                            \
    1340           "Trace OopMapGeneration")                                         \
    1341                                                                             \
    1342   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
    1343           "Trace OopMapGeneration: print detailed cell states")             \
    1344                                                                             \
    1345   develop(bool, TimeOopMap, false,                                          \
    1346           "Time calls to GenerateOopMap::compute_map() in sum")             \
    1347                                                                             \
    1348   develop(bool, TimeOopMap2, false,                                         \
    1349           "Time calls to GenerateOopMap::compute_map() individually")       \
    1350                                                                             \
    1351   develop(bool, TraceMonitorMismatch, false,                                \
    1352           "Trace monitor matching failures during OopMapGeneration")        \
    1353                                                                             \
    1354   develop(bool, TraceOopMapRewrites, false,                                 \
    1355           "Trace rewriting of method oops during oop map generation")       \
    1356                                                                             \
    1357   develop(bool, TraceSafepoint, false,                                      \
    1358           "Trace safepoint operations")                                     \
    1359                                                                             \
    1360   develop(bool, TraceICBuffer, false,                                       \
    1361           "Trace usage of IC buffer")                                       \
    1362                                                                             \
    1363   develop(bool, TraceCompiledIC, false,                                     \
    1364           "Trace changes of compiled IC")                                   \
    1365                                                                             \
    1366   notproduct(bool, TraceZapDeadLocals, false,                               \
    1367           "Trace zapping dead locals")                                      \
    1368                                                                             \
    1369   develop(bool, TraceStartupTime, false,                                    \
    1370           "Trace setup time")                                               \
    1371                                                                             \
    1372   develop(bool, TraceProtectionDomainVerification, false,                   \
    1373           "Trace protection domain verification")                           \
    1374                                                                             \
    1375   develop(bool, TraceClearedExceptions, false,                              \
    1376           "Print when an exception is forcibly cleared")                    \
    1377                                                                             \
    1378   product(bool, TraceClassResolution, false,                                \
    1379           "Trace all constant pool resolutions (for debugging)")            \
    1380                                                                             \
    1381   product(bool, TraceBiasedLocking, false,                                  \
    1382           "Trace biased locking in JVM")                                    \
    1383                                                                             \
    1384   product(bool, TraceMonitorInflation, false,                               \
    1385           "Trace monitor inflation in JVM")                                 \
    1386                                                                             \
    1387   /* gc */                                                                  \
    1388                                                                             \
    1389   product(bool, UseSerialGC, false,                                         \
    1390           "Use the Serial garbage collector")                               \
    1391                                                                             \
    1392   product(bool, UseG1GC, false,                                             \
    1393           "Use the Garbage-First garbage collector")                        \
    1394                                                                             \
    1395   product(bool, UseParallelGC, false,                                       \
    1396           "Use the Parallel Scavenge garbage collector")                    \
    1397                                                                             \
    1398   product(bool, UseParallelOldGC, false,                                    \
    1399           "Use the Parallel Old garbage collector")                         \
    1400                                                                             \
    1401   product(uintx, HeapMaximumCompactionInterval, 20,                         \
    1402           "How often should we maximally compact the heap (not allowing "   \
    1403           "any dead space)")                                                \
    1404                                                                             \
    1405   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
    1406           "The collection count for the first maximum compaction")          \
    1407                                                                             \
    1408   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
    1409           "Use maximum compaction in the Parallel Old garbage collector "   \
    1410           "for a system GC")                                                \
    1411                                                                             \
    1412   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
    1413           "The mean used by the parallel compact dead wood "                \
    1414           "limiter (a number between 0-100)")                               \
    1415                                                                             \
    1416   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
    1417           "The standard deviation used by the parallel compact dead wood "  \
    1418           "limiter (a number between 0-100)")                               \
    1419                                                                             \
    1420   product(uintx, ParallelGCThreads, 0,                                      \
    1421           "Number of parallel threads parallel gc will use")                \
    1422                                                                             \
    1423   product(bool, UseDynamicNumberOfGCThreads, false,                         \
    1424           "Dynamically choose the number of parallel threads "              \
    1425           "parallel gc will use")                                           \
    1426                                                                             \
    1427   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
    1428           "Force dynamic selection of the number of "                       \
    1429           "parallel threads parallel gc will use to aid debugging")         \
    1430                                                                             \
    1431   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
    1432           "Size of heap (bytes) per GC thread used in calculating the "     \
    1433           "number of GC threads")                                           \
    1434                                                                             \
    1435   product(bool, TraceDynamicGCThreads, false,                               \
    1436           "Trace the dynamic GC thread usage")                              \
    1437                                                                             \
    1438   develop(bool, ParallelOldGCSplitALot, false,                              \
    1439           "Provoke splitting (copying data from a young gen space to "      \
    1440           "multiple destination spaces)")                                   \
    1441                                                                             \
    1442   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
    1443           "How often to provoke splitting a young gen space")               \
    1444                                                                             \
    1445   product(uintx, ConcGCThreads, 0,                                          \
    1446           "Number of threads concurrent gc will use")                       \
    1447                                                                             \
    1448   product(uintx, YoungPLABSize, 4096,                                       \
    1449           "Size of young gen promotion LAB's (in HeapWords)")               \
    1450                                                                             \
    1451   product(uintx, OldPLABSize, 1024,                                         \
    1452           "Size of old gen promotion LAB's (in HeapWords)")                 \
    1453                                                                             \
    1454   product(uintx, GCTaskTimeStampEntries, 200,                               \
    1455           "Number of time stamp entries per gc worker thread")              \
    1456                                                                             \
    1457   product(bool, AlwaysTenure, false,                                        \
    1458           "Always tenure objects in eden (ParallelGC only)")                \
    1459                                                                             \
    1460   product(bool, NeverTenure, false,                                         \
    1461           "Never tenure objects in eden, may tenure on overflow "           \
    1462           "(ParallelGC only)")                                              \
    1463                                                                             \
    1464   product(bool, ScavengeBeforeFullGC, true,                                 \
    1465           "Scavenge youngest generation before each full GC, "              \
    1466           "used with UseParallelGC")                                        \
    1467                                                                             \
    1468   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
    1469           "Allow scavenges to occur when to-space contains objects")        \
    1470                                                                             \
    1471   product(bool, UseConcMarkSweepGC, false,                                  \
    1472           "Use Concurrent Mark-Sweep GC in the old generation")             \
    1473                                                                             \
    1474   product(bool, ExplicitGCInvokesConcurrent, false,                         \
    1475           "A System.gc() request invokes a concurrent collection; "         \
    1476           "(effective only when UseConcMarkSweepGC)")                       \
    1477                                                                             \
    1478   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
    1479           "A System.gc() request invokes a concurrent collection and "      \
    1480           "also unloads classes during such a concurrent gc cycle "         \
    1481           "(effective only when UseConcMarkSweepGC)")                       \
    1482                                                                             \
    1483   product(bool, GCLockerInvokesConcurrent, false,                           \
    1484           "The exit of a JNI critical section necessitating a scavenge, "   \
    1485           "also kicks off a background concurrent collection")              \
    1486                                                                             \
    1487   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
    1488           "How much the GC can expand the eden by while the GC locker "     \
    1489           "is active (as a percentage)")                                    \
    1490                                                                             \
    1491   diagnostic(intx, GCLockerRetryAllocationCount, 2,                         \
    1492           "Number of times to retry allocations when "                      \
    1493           "blocked by the GC locker")                                       \
    1494                                                                             \
    1495   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
    1496           "Use adaptive free lists in the CMS generation")                  \
    1497                                                                             \
    1498   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
    1499           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
    1500                                                                             \
    1501   develop(bool, RotateCMSCollectionTypes, false,                            \
    1502           "Rotate the CMS collections among concurrent and STW")            \
    1503                                                                             \
    1504   product(bool, UseCMSBestFit, true,                                        \
    1505           "Use CMS best fit allocation strategy")                           \
    1506                                                                             \
    1507   product(bool, UseCMSCollectionPassing, true,                              \
    1508           "Use passing of collection from background to foreground")        \
    1509                                                                             \
    1510   product(bool, UseParNewGC, false,                                         \
    1511           "Use parallel threads in the new generation")                     \
    1512                                                                             \
    1513   product(bool, ParallelGCVerbose, false,                                   \
    1514           "Verbose output for parallel gc")                                 \
    1515                                                                             \
    1516   product(uintx, ParallelGCBufferWastePct, 10,                              \
    1517           "Wasted fraction of parallel allocation buffer")                  \
    1518                                                                             \
    1519   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
    1520           "Retain parallel allocation buffers across scavenges; "           \
    1521           "it is disabled because this currently conflicts with "           \
    1522           "parallel card scanning under certain conditions.")               \
    1523                                                                             \
    1524   product(uintx, TargetPLABWastePct, 10,                                    \
    1525           "Target wasted space in last buffer as percent of overall "       \
    1526           "allocation")                                                     \
    1527                                                                             \
    1528   product(uintx, PLABWeight, 75,                                            \
    1529           "Percentage (0-100) used to weigh the current sample when "       \
    1530           "computing exponentially decaying average for ResizePLAB")        \
    1531                                                                             \
    1532   product(bool, ResizePLAB, true,                                           \
    1533           "Dynamically resize (survivor space) promotion LAB's")            \
    1534                                                                             \
    1535   product(bool, PrintPLAB, false,                                           \
    1536           "Print (survivor space) promotion LAB's sizing decisions")        \
    1537                                                                             \
    1538   product(intx, ParGCArrayScanChunk, 50,                                    \
    1539           "Scan a subset of object array and push remainder, if array is "  \
    1540           "bigger than this")                                               \
    1541                                                                             \
    1542   product(bool, ParGCUseLocalOverflow, false,                               \
    1543           "Instead of a global overflow list, use local overflow stacks")   \
    1544                                                                             \
    1545   product(bool, ParGCTrimOverflow, true,                                    \
    1546           "Eagerly trim the local overflow lists "                          \
    1547           "(when ParGCUseLocalOverflow)")                                   \
    1548                                                                             \
    1549   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
    1550           "Simulate work queue overflow in ParNew")                         \
    1551                                                                             \
    1552   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
    1553           "An `interval' counter that determines how frequently "           \
    1554           "we simulate overflow; a smaller number increases frequency")     \
    1555                                                                             \
    1556   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
    1557           "The desired number of objects to claim from the overflow list")  \
    1558                                                                             \
    1559   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
    1560           "The number of strides per worker thread that we divide up the "  \
    1561           "card table scanning work into")                                  \
    1562                                                                             \
    1563   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
    1564           "The number of cards in each chunk of the parallel chunks used "  \
    1565           "during card table scanning")                                     \
    1566                                                                             \
    1567   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
    1568           "Number of blocks to attempt to claim when refilling CMS LAB's "  \
    1569           "for parallel GC")                                                \
    1570                                                                             \
    1571   product(uintx, OldPLABWeight, 50,                                         \
    1572           "Percentage (0-100) used to weight the current sample when "      \
    1573           "computing exponentially decaying average for resizing "          \
    1574           "CMSParPromoteBlocksToClaim")                                     \
    1575                                                                             \
    1576   product(bool, ResizeOldPLAB, true,                                        \
    1577           "Dynamically resize (old gen) promotion LAB's")                   \
    1578                                                                             \
    1579   product(bool, PrintOldPLAB, false,                                        \
    1580           "Print (old gen) promotion LAB's sizing decisions")               \
    1581                                                                             \
    1582   product(uintx, CMSOldPLABMin, 16,                                         \
    1583           "Minimum size of CMS gen promotion LAB caches per worker "        \
    1584           "per block size")                                                 \
    1585                                                                             \
    1586   product(uintx, CMSOldPLABMax, 1024,                                       \
    1587           "Maximum size of CMS gen promotion LAB caches per worker "        \
    1588           "per block size")                                                 \
    1589                                                                             \
    1590   product(uintx, CMSOldPLABNumRefills, 4,                                   \
    1591           "Nominal number of refills of CMS gen promotion LAB cache "       \
    1592           "per worker per block size")                                      \
    1593                                                                             \
    1594   product(bool, CMSOldPLABResizeQuicker, false,                             \
    1595           "React on-the-fly during a scavenge to a sudden "                 \
    1596           "change in block demand rate")                                    \
    1597                                                                             \
    1598   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
    1599           "The tolerance of the phase-change detector for on-the-fly "      \
    1600           "PLAB resizing during a scavenge")                                \
    1601                                                                             \
    1602   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
    1603           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
    1604           "during a scavenge")                                              \
    1605                                                                             \
    1606   product(bool, AlwaysPreTouch, false,                                      \
    1607           "Force all freshly committed pages to be pre-touched")            \
    1608                                                                             \
    1609   product_pd(uintx, CMSYoungGenPerWorker,                                   \
    1610           "The maximum size of young gen chosen by default per GC worker "  \
    1611           "thread available")                                               \
    1612                                                                             \
    1613   product(bool, CMSIncrementalMode, false,                                  \
    1614           "Whether CMS GC should operate in \"incremental\" mode")          \
    1615                                                                             \
    1616   product(uintx, CMSIncrementalDutyCycle, 10,                               \
    1617           "Percentage (0-100) of CMS incremental mode duty cycle. If "      \
    1618           "CMSIncrementalPacing is enabled, then this is just the initial " \
    1619           "value.")                                                         \
    1620                                                                             \
    1621   product(bool, CMSIncrementalPacing, true,                                 \
    1622           "Whether the CMS incremental mode duty cycle should be "          \
    1623           "automatically adjusted")                                         \
    1624                                                                             \
    1625   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
    1626           "Minimum percentage (0-100) of the CMS incremental duty cycle "   \
    1627           "used when CMSIncrementalPacing is enabled")                      \
    1628                                                                             \
    1629   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
    1630           "Percentage (0-100) used to add conservatism when computing the " \
    1631           "duty cycle")                                                     \
    1632                                                                             \
    1633   product(uintx, CMSIncrementalOffset, 0,                                   \
    1634           "Percentage (0-100) by which the CMS incremental mode duty cycle "\
    1635           "is shifted to the right within the period between young GCs")    \
    1636                                                                             \
    1637   product(uintx, CMSExpAvgFactor, 50,                                       \
    1638           "Percentage (0-100) used to weigh the current sample when "       \
    1639           "computing exponential averages for CMS statistics")              \
    1640                                                                             \
    1641   product(uintx, CMS_FLSWeight, 75,                                         \
    1642           "Percentage (0-100) used to weigh the current sample when "       \
    1643           "computing exponentially decaying averages for CMS FLS "          \
    1644           "statistics")                                                     \
    1645                                                                             \
    1646   product(uintx, CMS_FLSPadding, 1,                                         \
    1647           "The multiple of deviation from mean to use for buffering "       \
    1648           "against volatility in free list demand")                         \
    1649                                                                             \
    1650   product(uintx, FLSCoalescePolicy, 2,                                      \
    1651           "CMS: aggressiveness level for coalescing, increasing "           \
    1652           "from 0 to 4")                                                    \
    1653                                                                             \
    1654   product(bool, FLSAlwaysCoalesceLarge, false,                              \
    1655           "CMS: larger free blocks are always available for coalescing")    \
    1656                                                                             \
    1657   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
    1658           "CMS: the smaller the percentage the greater the coalescing "     \
    1659           "force")                                                          \
    1660                                                                             \
    1661   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
    1662           "CMS: the factor by which to inflate estimated demand of small "  \
    1663           "block sizes to prevent coalescing with an adjoining block")      \
    1664                                                                             \
    1665   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
    1666           "CMS: the factor by which to inflate estimated demand of large "  \
    1667           "block sizes to prevent coalescing with an adjoining block")      \
    1668                                                                             \
    1669   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
    1670           "CMS: the factor by which to inflate estimated demand of small "  \
    1671           "block sizes to prevent splitting to supply demand for smaller "  \
    1672           "blocks")                                                         \
    1673                                                                             \
    1674   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
    1675           "CMS: the factor by which to inflate estimated demand of large "  \
    1676           "block sizes to prevent splitting to supply demand for smaller "  \
    1677           "blocks")                                                         \
    1678                                                                             \
    1679   product(bool, CMSExtrapolateSweep, false,                                 \
    1680           "CMS: cushion for block demand during sweep")                     \
    1681                                                                             \
    1682   product(uintx, CMS_SweepWeight, 75,                                       \
    1683           "Percentage (0-100) used to weight the current sample when "      \
    1684           "computing exponentially decaying average for inter-sweep "       \
    1685           "duration")                                                       \
    1686                                                                             \
    1687   product(uintx, CMS_SweepPadding, 1,                                       \
    1688           "The multiple of deviation from mean to use for buffering "       \
    1689           "against volatility in inter-sweep duration")                     \
    1690                                                                             \
    1691   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
    1692           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
    1693           "duration exceeds this threshold in milliseconds")                \
    1694                                                                             \
    1695   develop(bool, CMSTraceIncrementalMode, false,                             \
    1696           "Trace CMS incremental mode")                                     \
    1697                                                                             \
    1698   develop(bool, CMSTraceIncrementalPacing, false,                           \
    1699           "Trace CMS incremental mode pacing computation")                  \
    1700                                                                             \
    1701   develop(bool, CMSTraceThreadState, false,                                 \
    1702           "Trace the CMS thread state (enable the trace_state() method)")   \
    1703                                                                             \
    1704   product(bool, CMSClassUnloadingEnabled, true,                             \
    1705           "Whether class unloading enabled when using CMS GC")              \
    1706                                                                             \
    1707   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
    1708           "When CMS class unloading is enabled, the maximum CMS cycle "     \
    1709           "count for which classes may not be unloaded")                    \
    1710                                                                             \
    1711   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
    1712           "Compact when asked to collect CMS gen with "                     \
    1713           "clear_all_soft_refs()")                                          \
    1714                                                                             \
    1715   product(bool, UseCMSCompactAtFullCollection, true,                        \
    1716           "Use Mark-Sweep-Compact algorithm at full collections")           \
    1717                                                                             \
    1718   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
    1719           "Number of CMS full collection done before compaction if > 0")    \
    1720                                                                             \
    1721   develop(intx, CMSDictionaryChoice, 0,                                     \
    1722           "Use BinaryTreeDictionary as default in the CMS generation")      \
    1723                                                                             \
    1724   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
    1725           "Replenish an indexed free list with this number of chunks")      \
    1726                                                                             \
    1727   product(bool, CMSReplenishIntermediate, true,                             \
    1728           "Replenish all intermediate free-list caches")                    \
    1729                                                                             \
    1730   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
    1731           "When satisfying batched demand, split blocks from the "          \
    1732           "IndexedFreeList whose size is a multiple of requested size")     \
    1733                                                                             \
    1734   product(bool, CMSLoopWarn, false,                                         \
    1735           "Warn in case of excessive CMS looping")                          \
    1736                                                                             \
    1737   develop(bool, CMSOverflowEarlyRestoration, false,                         \
    1738           "Restore preserved marks early")                                  \
    1739                                                                             \
    1740   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
    1741           "Size of marking stack")                                          \
    1742                                                                             \
    1743   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
    1744           "Maximum size of marking stack")                                  \
    1745                                                                             \
    1746   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
    1747           "Simulate frequent marking stack / work queue overflow")          \
    1748                                                                             \
    1749   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
    1750           "An \"interval\" counter that determines how frequently "         \
    1751           "to simulate overflow; a smaller number increases frequency")     \
    1752                                                                             \
    1753   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
    1754           "(Temporary, subject to experimentation) "                        \
    1755           "Maximum number of abortable preclean iterations, if > 0")        \
    1756                                                                             \
    1757   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
    1758           "(Temporary, subject to experimentation) "                        \
    1759           "Maximum time in abortable preclean (in milliseconds)")           \
    1760                                                                             \
    1761   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
    1762           "(Temporary, subject to experimentation) "                        \
    1763           "Nominal minimum work per abortable preclean iteration")          \
    1764                                                                             \
    1765   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
    1766           "(Temporary, subject to experimentation) "                        \
    1767           "Time that we sleep between iterations when not given "           \
    1768           "enough work per iteration")                                      \
    1769                                                                             \
    1770   product(uintx, CMSRescanMultiple, 32,                                     \
    1771           "Size (in cards) of CMS parallel rescan task")                    \
    1772                                                                             \
    1773   product(uintx, CMSConcMarkMultiple, 32,                                   \
    1774           "Size (in cards) of CMS concurrent MT marking task")              \
    1775                                                                             \
    1776   product(bool, CMSAbortSemantics, false,                                   \
    1777           "Whether abort-on-overflow semantics is implemented")             \
    1778                                                                             \
    1779   product(bool, CMSParallelInitialMarkEnabled, true,                        \
    1780           "Use the parallel initial mark.")                                 \
    1781                                                                             \
    1782   product(bool, CMSParallelRemarkEnabled, true,                             \
    1783           "Whether parallel remark enabled (only if ParNewGC)")             \
    1784                                                                             \
    1785   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
    1786           "Whether parallel remark of survivor space "                      \
    1787           "enabled (effective only if CMSParallelRemarkEnabled)")           \
    1788                                                                             \
    1789   product(bool, CMSPLABRecordAlways, true,                                  \
    1790           "Always record survivor space PLAB boundaries (effective only "   \
    1791           "if CMSParallelSurvivorRemarkEnabled)")                           \
    1792                                                                             \
    1793   product(bool, CMSEdenChunksRecordAlways, true,                            \
    1794           "Always record eden chunks used for the parallel initial mark "   \
    1795           "or remark of eden")                                              \
    1796                                                                             \
    1797   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
    1798           "Print the eden and the survivor chunks used for the parallel "   \
    1799           "initial mark or remark of the eden/survivor spaces")             \
    1800                                                                             \
    1801   product(bool, CMSConcurrentMTEnabled, true,                               \
    1802           "Whether multi-threaded concurrent work enabled "                 \
    1803           "(effective only if ParNewGC)")                                   \
    1804                                                                             \
    1805   product(bool, CMSPrecleaningEnabled, true,                                \
    1806           "Whether concurrent precleaning enabled")                         \
    1807                                                                             \
    1808   product(uintx, CMSPrecleanIter, 3,                                        \
    1809           "Maximum number of precleaning iteration passes")                 \
    1810                                                                             \
    1811   product(uintx, CMSPrecleanNumerator, 2,                                   \
    1812           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
    1813           "ratio")                                                          \
    1814                                                                             \
    1815   product(uintx, CMSPrecleanDenominator, 3,                                 \
    1816           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
    1817           "ratio")                                                          \
    1818                                                                             \
    1819   product(bool, CMSPrecleanRefLists1, true,                                 \
    1820           "Preclean ref lists during (initial) preclean phase")             \
    1821                                                                             \
    1822   product(bool, CMSPrecleanRefLists2, false,                                \
    1823           "Preclean ref lists during abortable preclean phase")             \
    1824                                                                             \
    1825   product(bool, CMSPrecleanSurvivors1, false,                               \
    1826           "Preclean survivors during (initial) preclean phase")             \
    1827                                                                             \
    1828   product(bool, CMSPrecleanSurvivors2, true,                                \
    1829           "Preclean survivors during abortable preclean phase")             \
    1830                                                                             \
    1831   product(uintx, CMSPrecleanThreshold, 1000,                                \
    1832           "Do not iterate again if number of dirty cards is less than this")\
    1833                                                                             \
    1834   product(bool, CMSCleanOnEnter, true,                                      \
    1835           "Clean-on-enter optimization for reducing number of dirty cards") \
    1836                                                                             \
    1837   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
    1838           "Choose variant (1,2) of verification following remark")          \
    1839                                                                             \
    1840   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
    1841           "If Eden size is below this, do not try to schedule remark")      \
    1842                                                                             \
    1843   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
    1844           "The Eden occupancy percentage (0-100) at which "                 \
    1845           "to try and schedule remark pause")                               \
    1846                                                                             \
    1847   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
    1848           "Start sampling eden top at least before young gen "              \
    1849           "occupancy reaches 1/<ratio> of the size at which "               \
    1850           "we plan to schedule remark")                                     \
    1851                                                                             \
    1852   product(uintx, CMSSamplingGrain, 16*K,                                    \
    1853           "The minimum distance between eden samples for CMS (see above)")  \
    1854                                                                             \
    1855   product(bool, CMSScavengeBeforeRemark, false,                             \
    1856           "Attempt scavenge before the CMS remark step")                    \
    1857                                                                             \
    1858   develop(bool, CMSTraceSweeper, false,                                     \
    1859           "Trace some actions of the CMS sweeper")                          \
    1860                                                                             \
    1861   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
    1862           "Don't drain below this size per parallel worker/thief")          \
    1863                                                                             \
    1864   manageable(intx, CMSWaitDuration, 2000,                                   \
    1865           "Time in milliseconds that CMS thread waits for young GC")        \
    1866                                                                             \
    1867   develop(uintx, CMSCheckInterval, 1000,                                    \
    1868           "Interval in milliseconds that CMS thread checks if it "          \
    1869           "should start a collection cycle")                                \
    1870                                                                             \
    1871   product(bool, CMSYield, true,                                             \
    1872           "Yield between steps of CMS")                                     \
    1873                                                                             \
    1874   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
    1875           "Bitmap operations should process at most this many bits "        \
    1876           "between yields")                                                 \
    1877                                                                             \
    1878   product(bool, CMSDumpAtPromotionFailure, false,                           \
    1879           "Dump useful information about the state of the CMS old "         \
    1880           "generation upon a promotion failure")                            \
    1881                                                                             \
    1882   product(bool, CMSPrintChunksInDump, false,                                \
    1883           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
    1884           "more detailed information about the free chunks")                \
    1885                                                                             \
    1886   product(bool, CMSPrintObjectsInDump, false,                               \
    1887           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
    1888           "more detailed information about the allocated objects")          \
    1889                                                                             \
    1890   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
    1891           "Verify that all references across the FLS boundary "             \
    1892           "are to valid objects")                                           \
    1893                                                                             \
    1894   diagnostic(bool, FLSVerifyLists, false,                                   \
    1895           "Do lots of (expensive) FreeListSpace verification")              \
    1896                                                                             \
    1897   diagnostic(bool, FLSVerifyIndexTable, false,                              \
    1898           "Do lots of (expensive) FLS index table verification")            \
    1899                                                                             \
    1900   develop(bool, FLSVerifyDictionary, false,                                 \
    1901           "Do lots of (expensive) FLS dictionary verification")             \
    1902                                                                             \
    1903   develop(bool, VerifyBlockOffsetArray, false,                              \
    1904           "Do (expensive) block offset array verification")                 \
    1905                                                                             \
    1906   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
    1907           "Maintain _unallocated_block in BlockOffsetArray "                \
    1908           "(currently applicable only to CMS collector)")                   \
    1909                                                                             \
    1910   develop(bool, TraceCMSState, false,                                       \
    1911           "Trace the state of the CMS collection")                          \
    1912                                                                             \
    1913   product(intx, RefDiscoveryPolicy, 0,                                      \
    1914           "Select type of reference discovery policy: "                     \
    1915           "reference-based(0) or referent-based(1)")                        \
    1916                                                                             \
    1917   product(bool, ParallelRefProcEnabled, false,                              \
    1918           "Enable parallel reference processing whenever possible")         \
    1919                                                                             \
    1920   product(bool, ParallelRefProcBalancingEnabled, true,                      \
    1921           "Enable balancing of reference processing queues")                \
    1922                                                                             \
    1923   product(uintx, CMSTriggerRatio, 80,                                       \
    1924           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
    1925           "allocated before a CMS collection cycle commences")              \
    1926                                                                             \
    1927   product(uintx, CMSBootstrapOccupancy, 50,                                 \
    1928           "Percentage CMS generation occupancy at which to "                \
    1929           "initiate CMS collection for bootstrapping collection stats")     \
    1930                                                                             \
    1931   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
    1932           "Percentage CMS generation occupancy to start a CMS collection "  \
    1933           "cycle. A negative value means that CMSTriggerRatio is used")     \
    1934                                                                             \
    1935   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
    1936           "Percentage of the (entire) heap occupancy to start a "           \
    1937           "concurrent GC cycle. It is used by GCs that trigger a "          \
    1938           "concurrent GC cycle based on the occupancy of the entire heap, " \
    1939           "not just one of the generations (e.g., G1). A value of 0 "       \
    1940           "denotes 'do constant GC cycles'.")                               \
    1941                                                                             \
    1942   manageable(intx, CMSTriggerInterval, -1,                                  \
    1943           "Commence a CMS collection cycle (at least) every so many "       \
    1944           "milliseconds (0 permanently, -1 disabled)")                      \
    1945                                                                             \
    1946   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
    1947           "Only use occupancy as a criterion for starting a CMS collection")\
    1948                                                                             \
    1949   product(uintx, CMSIsTooFullPercentage, 98,                                \
    1950           "An absolute ceiling above which CMS will always consider the "   \
    1951           "unloading of classes when class unloading is enabled")           \
    1952                                                                             \
    1953   develop(bool, CMSTestInFreeList, false,                                   \
    1954           "Check if the coalesced range is already in the "                 \
    1955           "free lists as claimed")                                          \
    1956                                                                             \
    1957   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
    1958           "Check that all the garbage collected was returned to the "       \
    1959           "free lists")                                                     \
    1960                                                                             \
    1961   notproduct(bool, ScavengeALot, false,                                     \
    1962           "Force scavenge at every Nth exit from the runtime system "       \
    1963           "(N=ScavengeALotInterval)")                                       \
    1964                                                                             \
    1965   develop(bool, FullGCALot, false,                                          \
    1966           "Force full gc at every Nth exit from the runtime system "        \
    1967           "(N=FullGCALotInterval)")                                         \
    1968                                                                             \
    1969   notproduct(bool, GCALotAtAllSafepoints, false,                            \
    1970           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
    1971                                                                             \
    1972   product(bool, PrintPromotionFailure, false,                               \
    1973           "Print additional diagnostic information following "              \
    1974           "promotion failure")                                              \
    1975                                                                             \
    1976   notproduct(bool, PromotionFailureALot, false,                             \
    1977           "Use promotion failure handling on every youngest generation "    \
    1978           "collection")                                                     \
    1979                                                                             \
    1980   develop(uintx, PromotionFailureALotCount, 1000,                           \
    1981           "Number of promotion failures occurring at ParGCAllocBuffer "     \
    1982           "refill attempts (ParNew) or promotion attempts "                 \
    1983           "(other young collectors)")                                       \
    1984                                                                             \
    1985   develop(uintx, PromotionFailureALotInterval, 5,                           \
    1986           "Total collections between promotion failures alot")              \
    1987                                                                             \
    1988   experimental(uintx, WorkStealingSleepMillis, 1,                           \
    1989           "Sleep time when sleep is used for yields")                       \
    1990                                                                             \
    1991   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
    1992           "Number of yields before a sleep is done during workstealing")    \
    1993                                                                             \
    1994   experimental(uintx, WorkStealingHardSpins, 4096,                          \
    1995           "Number of iterations in a spin loop between checks on "          \
    1996           "time out of hard spin")                                          \
    1997                                                                             \
    1998   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
    1999           "Ratio of hard spins to calls to yield")                          \
    2000                                                                             \
    2001   develop(uintx, ObjArrayMarkingStride, 512,                                \
    2002           "Number of object array elements to push onto the marking stack " \
    2003           "before pushing a continuation entry")                            \
    2004                                                                             \
    2005   develop(bool, MetadataAllocationFailALot, false,                          \
    2006           "Fail metadata allocations at intervals controlled by "           \
    2007           "MetadataAllocationFailALotInterval")                             \
    2008                                                                             \
    2009   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
    2010           "Metadata allocation failure a lot interval")                     \
    2011                                                                             \
    2012   develop(bool, TraceMetadataChunkAllocation, false,                        \
    2013           "Trace chunk metadata allocations")                               \
    2014                                                                             \
    2015   product(bool, TraceMetadataHumongousAllocation, false,                    \
    2016           "Trace humongous metadata allocations")                           \
    2017                                                                             \
    2018   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
    2019           "Trace virtual space metadata allocations")                       \
    2020                                                                             \
    2021   notproduct(bool, ExecuteInternalVMTests, false,                           \
    2022           "Enable execution of internal VM tests")                          \
    2023                                                                             \
    2024   notproduct(bool, VerboseInternalVMTests, false,                           \
    2025           "Turn on logging for internal VM tests.")                         \
    2026                                                                             \
    2027   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
    2028                                                                             \
    2029   product_pd(bool, ResizeTLAB,                                              \
    2030           "Dynamically resize TLAB size for threads")                       \
    2031                                                                             \
    2032   product(bool, ZeroTLAB, false,                                            \
    2033           "Zero out the newly created TLAB")                                \
    2034                                                                             \
    2035   product(bool, FastTLABRefill, true,                                       \
    2036           "Use fast TLAB refill code")                                      \
    2037                                                                             \
    2038   product(bool, PrintTLAB, false,                                           \
    2039           "Print various TLAB related information")                         \
    2040                                                                             \
    2041   product(bool, TLABStats, true,                                            \
    2042           "Provide more detailed and expensive TLAB statistics "            \
    2043           "(with PrintTLAB)")                                               \
    2044                                                                             \
    2045   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
    2046           "Enable LowMemoryProtection"))                                    \
    2047                                                                             \
    2048   product_pd(bool, NeverActAsServerClassMachine,                            \
    2049           "Never act like a server-class machine")                          \
    2050                                                                             \
    2051   product(bool, AlwaysActAsServerClassMachine, false,                       \
    2052           "Always act like a server-class machine")                         \
    2053                                                                             \
    2054   product_pd(uint64_t, MaxRAM,                                              \
    2055           "Real memory size (in bytes) used to set maximum heap size")      \
    2056                                                                             \
    2057   product(uintx, ErgoHeapSizeLimit, 0,                                      \
    2058           "Maximum ergonomically set heap size (in bytes); zero means use " \
    2059           "MaxRAM / MaxRAMFraction")                                        \
    2060                                                                             \
    2061   product(uintx, MaxRAMFraction, 4,                                         \
    2062           "Maximum fraction (1/n) of real memory used for maximum heap "    \
    2063           "size")                                                           \
    2064                                                                             \
    2065   product(uintx, DefaultMaxRAMFraction, 4,                                  \
    2066           "Maximum fraction (1/n) of real memory used for maximum heap "    \
    2067           "size; deprecated: to be renamed to MaxRAMFraction")              \
    2068                                                                             \
    2069   product(uintx, MinRAMFraction, 2,                                         \
    2070           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
    2071           "size on systems with small physical memory size")                \
    2072                                                                             \
    2073   product(uintx, InitialRAMFraction, 64,                                    \
    2074           "Fraction (1/n) of real memory used for initial heap size")       \
    2075                                                                             \
    2076   develop(uintx, MaxVirtMemFraction, 2,                                     \
    2077           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
    2078           "determining maximum heap size")                                  \
    2079                                                                             \
    2080   product(bool, UseAutoGCSelectPolicy, false,                               \
    2081           "Use automatic collection selection policy")                      \
    2082                                                                             \
    2083   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
    2084           "Automatic GC selection pause threshold in milliseconds")         \
    2085                                                                             \
    2086   product(bool, UseAdaptiveSizePolicy, true,                                \
    2087           "Use adaptive generation sizing policies")                        \
    2088                                                                             \
    2089   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
    2090           "Use adaptive survivor sizing policies")                          \
    2091                                                                             \
    2092   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
    2093           "Use adaptive young-old sizing policies at minor collections")    \
    2094                                                                             \
    2095   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
    2096           "Use adaptive young-old sizing policies at major collections")    \
    2097                                                                             \
    2098   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
    2099           "Include statistics from System.gc() for adaptive size policy")   \
    2100                                                                             \
    2101   product(bool, UseAdaptiveGCBoundary, false,                               \
    2102           "Allow young-old boundary to move")                               \
    2103                                                                             \
    2104   develop(bool, TraceAdaptiveGCBoundary, false,                             \
    2105           "Trace young-old boundary moves")                                 \
    2106                                                                             \
    2107   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
    2108           "Resize the virtual spaces of the young or old generations")      \
    2109                                                                             \
    2110   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
    2111           "Policy for changing generation size for throughput goals")       \
    2112                                                                             \
    2113   product(uintx, AdaptiveSizePausePolicy, 0,                                \
    2114           "Policy for changing generation size for pause goals")            \
    2115                                                                             \
    2116   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
    2117           "Adjust tenured generation to achieve a minor pause goal")        \
    2118                                                                             \
    2119   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
    2120           "Adjust young generation to achieve a major pause goal")          \
    2121                                                                             \
    2122   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
    2123           "Number of steps where heuristics is used before data is used")   \
    2124                                                                             \
    2125   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
    2126           "Number of collections before the adaptive sizing is started")    \
    2127                                                                             \
    2128   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
    2129           "Collection interval for printing information; zero means never") \
    2130                                                                             \
    2131   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
    2132           "Use adaptive minimum footprint as a goal")                       \
    2133                                                                             \
    2134   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
    2135           "Weight given to exponential resizing, between 0 and 100")        \
    2136                                                                             \
    2137   product(uintx, AdaptiveTimeWeight,       25,                              \
    2138           "Weight given to time in adaptive policy, between 0 and 100")     \
    2139                                                                             \
    2140   product(uintx, PausePadding, 1,                                           \
    2141           "How much buffer to keep for pause time")                         \
    2142                                                                             \
    2143   product(uintx, PromotedPadding, 3,                                        \
    2144           "How much buffer to keep for promotion failure")                  \
    2145                                                                             \
    2146   product(uintx, SurvivorPadding, 3,                                        \
    2147           "How much buffer to keep for survivor overflow")                  \
    2148                                                                             \
    2149   product(uintx, ThresholdTolerance, 10,                                    \
    2150           "Allowed collection cost difference between generations")         \
    2151                                                                             \
    2152   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
    2153           "If collection costs are within margin, reduce both by full "     \
    2154           "delta")                                                          \
    2155                                                                             \
    2156   product(uintx, YoungGenerationSizeIncrement, 20,                          \
    2157           "Adaptive size percentage change in young generation")            \
    2158                                                                             \
    2159   product(uintx, YoungGenerationSizeSupplement, 80,                         \
    2160           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
    2161                                                                             \
    2162   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
    2163           "Decay factor to YoungedGenerationSizeSupplement")                \
    2164                                                                             \
    2165   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
    2166           "Adaptive size percentage change in tenured generation")          \
    2167                                                                             \
    2168   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
    2169           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
    2170                                                                             \
    2171   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
    2172           "Decay factor to TenuredGenerationSizeIncrement")                 \
    2173                                                                             \
    2174   product(uintx, MaxGCPauseMillis, max_uintx,                               \
    2175           "Adaptive size policy maximum GC pause time goal in millisecond, "\
    2176           "or (G1 Only) the maximum GC time per MMU time slice")            \
    2177                                                                             \
    2178   product(uintx, GCPauseIntervalMillis, 0,                                  \
    2179           "Time slice for MMU specification")                               \
    2180                                                                             \
    2181   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
    2182           "Adaptive size policy maximum GC minor pause time goal "          \
    2183           "in millisecond")                                                 \
    2184                                                                             \
    2185   product(uintx, GCTimeRatio, 99,                                           \
    2186           "Adaptive size policy application time to GC time ratio")         \
    2187                                                                             \
    2188   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
    2189           "Adaptive size scale down factor for shrinking")                  \
    2190                                                                             \
    2191   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
    2192           "Adaptive size decays the major cost for long major intervals")   \
    2193                                                                             \
    2194   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
    2195           "Time scale over which major costs decay")                        \
    2196                                                                             \
    2197   product(uintx, MinSurvivorRatio, 3,                                       \
    2198           "Minimum ratio of young generation/survivor space size")          \
    2199                                                                             \
    2200   product(uintx, InitialSurvivorRatio, 8,                                   \
    2201           "Initial ratio of young generation/survivor space size")          \
    2202                                                                             \
    2203   product(uintx, BaseFootPrintEstimate, 256*M,                              \
    2204           "Estimate of footprint other than Java Heap")                     \
    2205                                                                             \
    2206   product(bool, UseGCOverheadLimit, true,                                   \
    2207           "Use policy to limit of proportion of time spent in GC "          \
    2208           "before an OutOfMemory error is thrown")                          \
    2209                                                                             \
    2210   product(uintx, GCTimeLimit, 98,                                           \
    2211           "Limit of the proportion of time spent in GC before "             \
    2212           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
    2213                                                                             \
    2214   product(uintx, GCHeapFreeLimit, 2,                                        \
    2215           "Minimum percentage of free space after a full GC before an "     \
    2216           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
    2217                                                                             \
    2218   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
    2219           "Number of consecutive collections before gc time limit fires")   \
    2220                                                                             \
    2221   product(bool, PrintAdaptiveSizePolicy, false,                             \
    2222           "Print information about AdaptiveSizePolicy")                     \
    2223                                                                             \
    2224   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
    2225           "How far ahead to prefetch destination area (<= 0 means off)")    \
    2226                                                                             \
    2227   product(intx, PrefetchScanIntervalInBytes, -1,                            \
    2228           "How far ahead to prefetch scan area (<= 0 means off)")           \
    2229                                                                             \
    2230   product(intx, PrefetchFieldsAhead, -1,                                    \
    2231           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
    2232                                                                             \
    2233   diagnostic(bool, VerifySilently, false,                                   \
    2234           "Do not print the verification progress")                         \
    2235                                                                             \
    2236   diagnostic(bool, VerifyDuringStartup, false,                              \
    2237           "Verify memory system before executing any Java code "            \
    2238           "during VM initialization")                                       \
    2239                                                                             \
    2240   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
    2241           "Verify system before exiting")                                   \
    2242                                                                             \
    2243   diagnostic(bool, VerifyBeforeGC, false,                                   \
    2244           "Verify memory system before GC")                                 \
    2245                                                                             \
    2246   diagnostic(bool, VerifyAfterGC, false,                                    \
    2247           "Verify memory system after GC")                                  \
    2248                                                                             \
    2249   diagnostic(bool, VerifyDuringGC, false,                                   \
    2250           "Verify memory system during GC (between phases)")                \
    2251                                                                             \
    2252   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
    2253           "Enable parallel memory system verification")                     \
    2254                                                                             \
    2255   diagnostic(bool, DeferInitialCardMark, false,                             \
    2256           "When +ReduceInitialCardMarks, explicitly defer any that "        \
    2257           "may arise from new_pre_store_barrier")                           \
    2258                                                                             \
    2259   diagnostic(bool, VerifyRememberedSets, false,                             \
    2260           "Verify GC remembered sets")                                      \
    2261                                                                             \
    2262   diagnostic(bool, VerifyObjectStartArray, true,                            \
    2263           "Verify GC object start array if verify before/after")            \
    2264                                                                             \
    2265   product(bool, DisableExplicitGC, false,                                   \
    2266           "Ignore calls to System.gc()")                                    \
    2267                                                                             \
    2268   notproduct(bool, CheckMemoryInitialization, false,                        \
    2269           "Check memory initialization")                                    \
    2270                                                                             \
    2271   product(bool, CollectGen0First, false,                                    \
    2272           "Collect youngest generation before each full GC")                \
    2273                                                                             \
    2274   diagnostic(bool, BindCMSThreadToCPU, false,                               \
    2275           "Bind CMS Thread to CPU if possible")                             \
    2276                                                                             \
    2277   diagnostic(uintx, CPUForCMSThread, 0,                                     \
    2278           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
    2279                                                                             \
    2280   product(bool, BindGCTaskThreadsToCPUs, false,                             \
    2281           "Bind GCTaskThreads to CPUs if possible")                         \
    2282                                                                             \
    2283   product(bool, UseGCTaskAffinity, false,                                   \
    2284           "Use worker affinity when asking for GCTasks")                    \
    2285                                                                             \
    2286   product(uintx, ProcessDistributionStride, 4,                              \
    2287           "Stride through processors when distributing processes")          \
    2288                                                                             \
    2289   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
    2290           "Number of times the coordinator GC thread will sleep while "     \
    2291           "yielding before giving up and resuming GC")                      \
    2292                                                                             \
    2293   product(uintx, CMSYieldSleepCount, 0,                                     \
    2294           "Number of times a GC thread (minus the coordinator) "            \
    2295           "will sleep while yielding before giving up and resuming GC")     \
    2296                                                                             \
    2297   /* gc tracing */                                                          \
    2298   manageable(bool, PrintGC, false,                                          \
    2299           "Print message at garbage collection")                            \
    2300                                                                             \
    2301   manageable(bool, PrintGCDetails, false,                                   \
    2302           "Print more details at garbage collection")                       \
    2303                                                                             \
    2304   manageable(bool, PrintGCDateStamps, false,                                \
    2305           "Print date stamps at garbage collection")                        \
    2306                                                                             \
    2307   manageable(bool, PrintGCTimeStamps, false,                                \
    2308           "Print timestamps at garbage collection")                         \
    2309                                                                             \
    2310   manageable(bool, PrintGCID, false,                                        \
    2311           "Print an identifier for each garbage collection")                \
    2312                                                                             \
    2313   product(bool, PrintGCTaskTimeStamps, false,                               \
    2314           "Print timestamps for individual gc worker thread tasks")         \
    2315                                                                             \
    2316   develop(intx, ConcGCYieldTimeout, 0,                                      \
    2317           "If non-zero, assert that GC threads yield within this "          \
    2318           "number of milliseconds")                                         \
    2319                                                                             \
    2320   notproduct(bool, TraceMarkSweep, false,                                   \
    2321           "Trace mark sweep")                                               \
    2322                                                                             \
    2323   product(bool, PrintReferenceGC, false,                                    \
    2324           "Print times spent handling reference objects during GC "         \
    2325           "(enabled only when PrintGCDetails)")                             \
    2326                                                                             \
    2327   develop(bool, TraceReferenceGC, false,                                    \
    2328           "Trace handling of soft/weak/final/phantom references")           \
    2329                                                                             \
    2330   develop(bool, TraceFinalizerRegistration, false,                          \
    2331           "Trace registration of final references")                         \
    2332                                                                             \
    2333   notproduct(bool, TraceScavenge, false,                                    \
    2334           "Trace scavenge")                                                 \
    2335                                                                             \
    2336   product(bool, IgnoreEmptyClassPaths, false,                               \
    2337           "Ignore empty path elements in -classpath")                       \
    2338                                                                             \
    2339   product(bool, TraceClassPaths, false,                                     \
    2340           "Trace processing of class paths")                                \
    2341                                                                             \
    2342   product_rw(bool, TraceClassLoading, false,                                \
    2343           "Trace all classes loaded")                                       \
    2344                                                                             \
    2345   product(bool, TraceClassLoadingPreorder, false,                           \
    2346           "Trace all classes loaded in order referenced (not loaded)")      \
    2347                                                                             \
    2348   product_rw(bool, TraceClassUnloading, false,                              \
    2349           "Trace unloading of classes")                                     \
    2350                                                                             \
    2351   product_rw(bool, TraceLoaderConstraints, false,                           \
    2352           "Trace loader constraints")                                       \
    2353                                                                             \
    2354   develop(bool, TraceClassLoaderData, false,                                \
    2355           "Trace class loader loader_data lifetime")                        \
    2356                                                                             \
    2357   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
    2358           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
    2359           "Initial size of the boot class loader data metaspace")           \
    2360                                                                             \
    2361   product(bool, TraceGen0Time, false,                                       \
    2362           "Trace accumulated time for Gen 0 collection")                    \
    2363                                                                             \
    2364   product(bool, TraceGen1Time, false,                                       \
    2365           "Trace accumulated time for Gen 1 collection")                    \
    2366                                                                             \
    2367   product(bool, PrintTenuringDistribution, false,                           \
    2368           "Print tenuring age information")                                 \
    2369                                                                             \
    2370   product_rw(bool, PrintHeapAtGC, false,                                    \
    2371           "Print heap layout before and after each GC")                     \
    2372                                                                             \
    2373   product_rw(bool, PrintHeapAtGCExtended, false,                            \
    2374           "Print extended information about the layout of the heap "        \
    2375           "when -XX:+PrintHeapAtGC is set")                                 \
    2376                                                                             \
    2377   product(bool, PrintHeapAtSIGBREAK, true,                                  \
    2378           "Print heap layout in response to SIGBREAK")                      \
    2379                                                                             \
    2380   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
    2381           "Print a class histogram before any major stop-world GC")         \
    2382                                                                             \
    2383   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
    2384           "Print a class histogram after any major stop-world GC")          \
    2385                                                                             \
    2386   manageable(bool, PrintClassHistogram, false,                              \
    2387           "Print a histogram of class instances")                           \
    2388                                                                             \
    2389   develop(bool, TraceWorkGang, false,                                       \
    2390           "Trace activities of work gangs")                                 \
    2391                                                                             \
    2392   product(bool, TraceParallelOldGCTasks, false,                             \
    2393           "Trace multithreaded GC activity")                                \
    2394                                                                             \
    2395   develop(bool, TraceBlockOffsetTable, false,                               \
    2396           "Print BlockOffsetTable maps")                                    \
    2397                                                                             \
    2398   develop(bool, TraceCardTableModRefBS, false,                              \
    2399           "Print CardTableModRefBS maps")                                   \
    2400                                                                             \
    2401   develop(bool, TraceGCTaskManager, false,                                  \
    2402           "Trace actions of the GC task manager")                           \
    2403                                                                             \
    2404   develop(bool, TraceGCTaskQueue, false,                                    \
    2405           "Trace actions of the GC task queues")                            \
    2406                                                                             \
    2407   diagnostic(bool, TraceGCTaskThread, false,                                \
    2408           "Trace actions of the GC task threads")                           \
    2409                                                                             \
    2410   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
    2411           "Print the time taken by each phase in ParallelOldGC "            \
    2412           "(PrintGCDetails must also be enabled)")                          \
    2413                                                                             \
    2414   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
    2415           "Trace marking phase in ParallelOldGC")                           \
    2416                                                                             \
    2417   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
    2418           "Trace summary phase in ParallelOldGC")                           \
    2419                                                                             \
    2420   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
    2421           "Trace compaction phase in ParallelOldGC")                        \
    2422                                                                             \
    2423   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
    2424           "Trace dense prefix computation for ParallelOldGC")               \
    2425                                                                             \
    2426   develop(bool, IgnoreLibthreadGPFault, false,                              \
    2427           "Suppress workaround for libthread GP fault")                     \
    2428                                                                             \
    2429   product(bool, PrintJNIGCStalls, false,                                    \
    2430           "Print diagnostic message when GC is stalled "                    \
    2431           "by JNI critical section")                                        \
    2432                                                                             \
    2433   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
    2434           "The percentage of the used heap that the instances of a class "  \
    2435           "must occupy for the class to generate a trace event")            \
    2436                                                                             \
    2437   /* GC log rotation setting */                                             \
    2438                                                                             \
    2439   product(bool, UseGCLogFileRotation, false,                                \
    2440           "Rotate gclog files (for long running applications). It requires "\
    2441           "-Xloggc:<filename>")                                             \
    2442                                                                             \
    2443   product(uintx, NumberOfGCLogFiles, 0,                                     \
    2444           "Number of gclog files in rotation "                              \
    2445           "(default: 0, no rotation)")                                      \
    2446                                                                             \
    2447   product(uintx, GCLogFileSize, 8*K,                                        \
    2448           "GC log file size, requires UseGCLogFileRotation. "               \
    2449           "Set to 0 to only trigger rotation via jcmd")                     \
    2450                                                                             \
    2451   /* JVMTI heap profiling */                                                \
    2452                                                                             \
    2453   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
    2454           "Trace JVMTI object tagging calls")                               \
    2455                                                                             \
    2456   diagnostic(bool, VerifyBeforeIteration, false,                            \
    2457           "Verify memory system before JVMTI iteration")                    \
    2458                                                                             \
    2459   /* compiler interface */                                                  \
    2460                                                                             \
    2461   develop(bool, CIPrintCompilerName, false,                                 \
    2462           "when CIPrint is active, print the name of the active compiler")  \
    2463                                                                             \
    2464   develop(bool, CIPrintCompileQueue, false,                                 \
    2465           "display the contents of the compile queue whenever a "           \
    2466           "compilation is enqueued")                                        \
    2467                                                                             \
    2468   develop(bool, CIPrintRequests, false,                                     \
    2469           "display every request for compilation")                          \
    2470                                                                             \
    2471   product(bool, CITime, false,                                              \
    2472           "collect timing information for compilation")                     \
    2473                                                                             \
    2474   develop(bool, CITimeEach, false,                                          \
    2475           "display timing information after each successful compilation")   \
    2476                                                                             \
    2477   develop(bool, CICountOSR, false,                                          \
    2478           "use a separate counter when assigning ids to osr compilations")  \
    2479                                                                             \
    2480   develop(bool, CICompileNatives, true,                                     \
    2481           "compile native methods if supported by the compiler")            \
    2482                                                                             \
    2483   develop_pd(bool, CICompileOSR,                                            \
    2484           "compile on stack replacement methods if supported by the "       \
    2485           "compiler")                                                       \
    2486                                                                             \
    2487   develop(bool, CIPrintMethodCodes, false,                                  \
    2488           "print method bytecodes of the compiled code")                    \
    2489                                                                             \
    2490   develop(bool, CIPrintTypeFlow, false,                                     \
    2491           "print the results of ciTypeFlow analysis")                       \
    2492                                                                             \
    2493   develop(bool, CITraceTypeFlow, false,                                     \
    2494           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
    2495                                                                             \
    2496   develop(intx, OSROnlyBCI, -1,                                             \
    2497           "OSR only at this bci.  Negative values mean exclude that bci")   \
    2498                                                                             \
    2499   /* compiler */                                                            \
    2500                                                                             \
    2501   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
    2502           "Number of compiler threads to run")                              \
    2503                                                                             \
    2504   product(intx, CompilationPolicyChoice, 0,                                 \
    2505           "which compilation policy (0/1)")                                 \
    2506                                                                             \
    2507   develop(bool, UseStackBanging, true,                                      \
    2508           "use stack banging for stack overflow checks (required for "      \
    2509           "proper StackOverflow handling; disable only to measure cost "    \
    2510           "of stackbanging)")                                               \
    2511                                                                             \
    2512   develop(bool, UseStrictFP, true,                                          \
    2513           "use strict fp if modifier strictfp is set")                      \
    2514                                                                             \
    2515   develop(bool, GenerateSynchronizationCode, true,                          \
    2516           "generate locking/unlocking code for synchronized methods and "   \
    2517           "monitors")                                                       \
    2518                                                                             \
    2519   develop(bool, GenerateCompilerNullChecks, true,                           \
    2520           "Generate explicit null checks for loads/stores/calls")           \
    2521                                                                             \
    2522   develop(bool, GenerateRangeChecks, true,                                  \
    2523           "Generate range checks for array accesses")                       \
    2524                                                                             \
    2525   develop_pd(bool, ImplicitNullChecks,                                      \
    2526           "Generate code for implicit null checks")                         \
    2527                                                                             \
    2528   product_pd(bool, TrapBasedNullChecks,                                     \
    2529           "Generate code for null checks that uses a cmp and trap "         \
    2530           "instruction raising SIGTRAP.  This is only used if an access to" \
    2531           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
    2532           "ImplicitNullChecks don't work (PPC64).")                         \
    2533                                                                             \
    2534   product(bool, PrintSafepointStatistics, false,                            \
    2535           "Print statistics about safepoint synchronization")               \
    2536                                                                             \
    2537   product(intx, PrintSafepointStatisticsCount, 300,                         \
    2538           "Total number of safepoint statistics collected "                 \
    2539           "before printing them out")                                       \
    2540                                                                             \
    2541   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
    2542           "Print safepoint statistics only when safepoint takes "           \
    2543           "more than PrintSafepointSatisticsTimeout in millis")             \
    2544                                                                             \
    2545   product(bool, TraceSafepointCleanupTime, false,                           \
    2546           "Print the break down of clean up tasks performed during "        \
    2547           "safepoint")                                                      \
    2548                                                                             \
    2549   product(bool, Inline, true,                                               \
    2550           "Enable inlining")                                                \
    2551                                                                             \
    2552   product(bool, ClipInlining, true,                                         \
    2553           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
    2554                                                                             \
    2555   develop(bool, UseCHA, true,                                               \
    2556           "Enable CHA")                                                     \
    2557                                                                             \
    2558   product(bool, UseTypeProfile, true,                                       \
    2559           "Check interpreter profile for historically monomorphic calls")   \
    2560                                                                             \
    2561   notproduct(bool, TimeCompiler, false,                                     \
    2562           "Time the compiler")                                              \
    2563                                                                             \
    2564   diagnostic(bool, PrintInlining, false,                                    \
    2565           "Print inlining optimizations")                                   \
    2566                                                                             \
    2567   product(bool, UsePopCountInstruction, false,                              \
    2568           "Use population count instruction")                               \
    2569                                                                             \
    2570   develop(bool, EagerInitialization, false,                                 \
    2571           "Eagerly initialize classes if possible")                         \
    2572                                                                             \
    2573   develop(bool, TraceMethodReplacement, false,                              \
    2574           "Print when methods are replaced do to recompilation")            \
    2575                                                                             \
    2576   develop(bool, PrintMethodFlushing, false,                                 \
    2577           "Print the nmethods being flushed")                               \
    2578                                                                             \
    2579   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
    2580           "print statistics about method flushing")                         \
    2581                                                                             \
    2582   develop(bool, UseRelocIndex, false,                                       \
    2583           "Use an index to speed random access to relocations")             \
    2584                                                                             \
    2585   develop(bool, StressCodeBuffers, false,                                   \
    2586           "Exercise code buffer expansion and other rare state changes")    \
    2587                                                                             \
    2588   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
    2589           "Generate extra debugging information for non-safepoints in "     \
    2590           "nmethods")                                                       \
    2591                                                                             \
    2592   product(bool, PrintVMOptions, false,                                      \
    2593           "Print flags that appeared on the command line")                  \
    2594                                                                             \
    2595   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
    2596           "Ignore unrecognized VM options")                                 \
    2597                                                                             \
    2598   product(bool, PrintCommandLineFlags, false,                               \
    2599           "Print flags specified on command line or set by ergonomics")     \
    2600                                                                             \
    2601   product(bool, PrintFlagsInitial, false,                                   \
    2602           "Print all VM flags before argument processing and exit VM")      \
    2603                                                                             \
    2604   product(bool, PrintFlagsFinal, false,                                     \
    2605           "Print all VM flags after argument and ergonomic processing")     \
    2606                                                                             \
    2607   notproduct(bool, PrintFlagsWithComments, false,                           \
    2608           "Print all VM flags with default values and descriptions and "    \
    2609           "exit")                                                           \
    2610                                                                             \
    2611   diagnostic(bool, SerializeVMOutput, true,                                 \
    2612           "Use a mutex to serialize output to tty and LogFile")             \
    2613                                                                             \
    2614   diagnostic(bool, DisplayVMOutput, true,                                   \
    2615           "Display all VM output on the tty, independently of LogVMOutput") \
    2616                                                                             \
    2617   diagnostic(bool, LogVMOutput, false,                                      \
    2618           "Save VM output to LogFile")                                      \
    2619                                                                             \
    2620   diagnostic(ccstr, LogFile, NULL,                                          \
    2621           "If LogVMOutput or LogCompilation is on, save VM output to "      \
    2622           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
    2623                                                                             \
    2624   product(ccstr, ErrorFile, NULL,                                           \
    2625           "If an error occurs, save the error data to this file "           \
    2626           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
    2627                                                                             \
    2628   product(bool, DisplayVMOutputToStderr, false,                             \
    2629           "If DisplayVMOutput is true, display all VM output to stderr")    \
    2630                                                                             \
    2631   product(bool, DisplayVMOutputToStdout, false,                             \
    2632           "If DisplayVMOutput is true, display all VM output to stdout")    \
    2633                                                                             \
    2634   product(bool, UseHeavyMonitors, false,                                    \
    2635           "use heavyweight instead of lightweight Java monitors")           \
    2636                                                                             \
    2637   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
    2638           "Print statistics about the system dictionary at exit. "          \
    2639           "Deprecated: Please use PrintSystemDictionaryStatisticsAtExit"    \
    2640           "instead")                                                        \
    2641                                                                             \
    2642   experimental(intx, PredictedLoadedClassCount, 0,                          \
    2643           "Experimental: Tune loaded class cache starting size.")           \
    2644                                                                             \
    2645   product(bool, PrintStringTableStatistics, false,                          \
    2646           "Print statistics about the StringTable and SymbolTable. "        \
    2647           "Deprecated: Please use PrintStringTableStatisticsAtExit "        \
    2648           "and PrintStringTableStatisticsAtExit instead")                   \
    2649                                                                             \
    2650   diagnostic(bool, VerifyStringTableAtExit, false,                          \
    2651           "verify StringTable contents at exit")                            \
    2652                                                                             \
    2653   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
    2654           "print histogram of the symbol table")                            \
    2655                                                                             \
    2656   experimental(bool, PrintStringTableStatisticsAtExit, false,               \
    2657           "Print statistics about the string table at exit")                \
    2658                                                                             \
    2659   experimental(bool, PrintSymbolTableStatisticsAtExit, false,               \
    2660           "Print statistics about the symbol table at exit")                \
    2661                                                                             \
    2662   experimental(bool, PrintSystemDictionaryStatisticsAtExit, false,          \
    2663           "Print statistics about the system dictionary at exit")           \
    2664                                                                             \
    2665   experimental(bool, PrintStringTableStatisticsTimeline, false,             \
    2666           "Print timeline statistics about the string table")               \
    2667                                                                             \
    2668   experimental(bool, PrintSymbolTableStatisticsTimeline, false,             \
    2669           "Print timeline statistics about the symbol table")               \
    2670                                                                             \
    2671   experimental(bool, PrintSystemDictionaryStatisticsTimeline, false,        \
    2672           "Print timeline statistics about the system dictionary")          \
    2673                                                                             \
    2674   experimental(bool, HashtablesResizeSymbolTable, true,                     \
    2675           "Experimental: Turns on/off SymbolTable resizing")                \
    2676                                                                             \
    2677   experimental(bool, HashtablesResizeStringTable, true,                     \
    2678           "Experimental: Turns on/off StringTable resizing")                \
    2679                                                                             \
    2680   experimental(bool, HashtablesResizeSystemDictionary, true,                \
    2681           "Experimental: Turns on/off SystemDictionary resizing")           \
    2682                                                                             \
    2683   experimental(bool, HashtablesVerifyBeforeResize, false,                   \
    2684           "Experimental: Verify hashtable before resizing")                 \
    2685                                                                             \
    2686   experimental(bool, HashtablesVerifyAfterResize, false,                    \
    2687           "Experimental: Verify hashtable after resizing")                  \
    2688                                                                             \
    2689   experimental(double, HashtablesResizeSymbolTableTriggerLoadFactor, 12.0,   \
    2690           "Experimental: Heurstic for calculating when to resize "          \
    2691           "SymbolTable")                                                    \
    2692                                                                             \
    2693   experimental(double, HashtablesResizeStringTableTriggerLoadFactor, 12.0,   \
    2694           "Experimental: Heurstic for calculating when to resize "          \
    2695           "StringTable")                                                    \
    2696                                                                             \
    2697   experimental(double, HashtablesResizeSystemDictionaryTriggerLoadFactor, 12.0,\
    2698           "Experimental: Heurstic for calculating when to resize "          \
    2699           "SystemDictionary")                                               \
    2700                                                                             \
    2701   experimental(double, HashtablesResizeSymbolTableDesiredLoadFactor, 4.0,   \
    2702           "Experimental: Heurstic for calculating by how much to resize "   \
    2703           "SymbolTable")                                                    \
    2704                                                                             \
    2705   experimental(double, HashtablesResizeStringTableDesiredLoadFactor, 4.0,   \
    2706           "Experimental: Heurstic for calculating by how much to resize "   \
    2707           "StringTable")                                                    \
    2708                                                                             \
    2709   experimental(double, HashtablesResizeSystemDictionaryDesiredLoadFactor, 4.0,\
    2710           "Experimental: Heurstic for calculating by how much to resize "   \
    2711           "SystemDictionary")                                               \
    2712                                                                             \
    2713   experimental(bool, HashtablesResizeSort, false,                           \
    2714           "Experimental: Heurstic for sorting entries according to their "  \
    2715           "lookup counters, when resizing hash tables")                     \
    2716                                                                             \
    2717   experimental(bool, HashtablesUseEvenSize, false,                          \
    2718           "Experimental: Use even sizes for hashtables")                    \
    2719                                                                             \
    2720   notproduct(bool, ExitVMOnVerifyError, false,                              \
    2721           "standard exit from VM if bytecode verify error "                 \
    2722           "(only in debug mode)")                                           \
    2723                                                                             \
    2724   notproduct(ccstr, AbortVMOnException, NULL,                               \
    2725           "Call fatal if this exception is thrown.  Example: "              \
    2726           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
    2727                                                                             \
    2728   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
    2729           "Call fatal if the exception pointed by AbortVMOnException "      \
    2730           "has this message")                                               \
    2731                                                                             \
    2732   develop(bool, DebugVtables, false,                                        \
    2733           "add debugging code to vtable dispatch")                          \
    2734                                                                             \
    2735   develop(bool, PrintVtables, false,                                        \
    2736           "print vtables when printing klass")                              \
    2737                                                                             \
    2738   notproduct(bool, PrintVtableStats, false,                                 \
    2739           "print vtables stats at end of run")                              \
    2740                                                                             \
    2741   develop(bool, TraceCreateZombies, false,                                  \
    2742           "trace creation of zombie nmethods")                              \
    2743                                                                             \
    2744   notproduct(bool, IgnoreLockingAssertions, false,                          \
    2745           "disable locking assertions (for speed)")                         \
    2746                                                                             \
    2747   product(bool, RangeCheckElimination, true,                                \
    2748           "Eliminate range checks")                                         \
    2749                                                                             \
    2750   develop_pd(bool, UncommonNullCast,                                        \
    2751           "track occurrences of null in casts; adjust compiler tactics")    \
    2752                                                                             \
    2753   develop(bool, TypeProfileCasts,  true,                                    \
    2754           "treat casts like calls for purposes of type profiling")          \
    2755                                                                             \
    2756   develop(bool, DelayCompilationDuringStartup, true,                        \
    2757           "Delay invoking the compiler until main application class is "    \
    2758           "loaded")                                                         \
    2759                                                                             \
    2760   develop(bool, CompileTheWorld, false,                                     \
    2761           "Compile all methods in all classes in bootstrap class path "     \
    2762           "(stress test)")                                                  \
    2763                                                                             \
    2764   develop(bool, CompileTheWorldPreloadClasses, true,                        \
    2765           "Preload all classes used by a class before start loading")       \
    2766                                                                             \
    2767   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
    2768           "Force a safepoint every n compiles so sweeper can keep up")      \
    2769                                                                             \
    2770   develop(bool, FillDelaySlots, true,                                       \
    2771           "Fill delay slots (on SPARC only)")                               \
    2772                                                                             \
    2773   develop(bool, TimeLivenessAnalysis, false,                                \
    2774           "Time computation of bytecode liveness analysis")                 \
    2775                                                                             \
    2776   develop(bool, TraceLivenessGen, false,                                    \
    2777           "Trace the generation of liveness analysis information")          \
    2778                                                                             \
    2779   notproduct(bool, TraceLivenessQuery, false,                               \
    2780           "Trace queries of liveness analysis information")                 \
    2781                                                                             \
    2782   notproduct(bool, CollectIndexSetStatistics, false,                        \
    2783           "Collect information about IndexSets")                            \
    2784                                                                             \
    2785   develop(bool, UseLoopSafepoints, true,                                    \
    2786           "Generate Safepoint nodes in every loop")                         \
    2787                                                                             \
    2788   develop(intx, FastAllocateSizeLimit, 128*K,                               \
    2789           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
    2790           "Inline allocations larger than this in doublewords must go slow")\
    2791                                                                             \
    2792   product(bool, AggressiveOpts, false,                                      \
    2793           "Enable aggressive optimizations - see arguments.cpp")            \
    2794                                                                             \
    2795   product_pd(uintx, TypeProfileLevel,                                       \
    2796           "=XYZ, with Z: Type profiling of arguments at call; "             \
    2797                      "Y: Type profiling of return value at call; "          \
    2798                      "X: Type profiling of parameters to methods; "         \
    2799           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
    2800                                                                             \
    2801   product(intx, TypeProfileArgsLimit,     2,                                \
    2802           "max number of call arguments to consider for type profiling")    \
    2803                                                                             \
    2804   product(intx, TypeProfileParmsLimit,    2,                                \
    2805           "max number of incoming parameters to consider for type profiling"\
    2806           ", -1 for all")                                                   \
    2807                                                                             \
    2808   /* statistics */                                                          \
    2809   develop(bool, CountCompiledCalls, false,                                  \
    2810           "Count method invocations")                                       \
    2811                                                                             \
    2812   notproduct(bool, CountRuntimeCalls, false,                                \
    2813           "Count VM runtime calls")                                         \
    2814                                                                             \
    2815   develop(bool, CountJNICalls, false,                                       \
    2816           "Count jni method invocations")                                   \
    2817                                                                             \
    2818   notproduct(bool, CountJVMCalls, false,                                    \
    2819           "Count jvm method invocations")                                   \
    2820                                                                             \
    2821   notproduct(bool, CountRemovableExceptions, false,                         \
    2822           "Count exceptions that could be replaced by branches due to "     \
    2823           "inlining")                                                       \
    2824                                                                             \
    2825   notproduct(bool, ICMissHistogram, false,                                  \
    2826           "Produce histogram of IC misses")                                 \
    2827                                                                             \
    2828   notproduct(bool, PrintClassStatistics, false,                             \
    2829           "Print class statistics at end of run")                           \
    2830                                                                             \
    2831   notproduct(bool, PrintMethodStatistics, false,                            \
    2832           "Print method statistics at end of run")                          \
    2833                                                                             \
    2834   /* interpreter */                                                         \
    2835   develop(bool, ClearInterpreterLocals, false,                              \
    2836           "Always clear local variables of interpreter activations upon "   \
    2837           "entry")                                                          \
    2838                                                                             \
    2839   product_pd(bool, RewriteBytecodes,                                        \
    2840           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
    2841                                                                             \
    2842   product_pd(bool, RewriteFrequentPairs,                                    \
    2843           "Rewrite frequently used bytecode pairs into a single bytecode")  \
    2844                                                                             \
    2845   diagnostic(bool, PrintInterpreter, false,                                 \
    2846           "Print the generated interpreter code")                           \
    2847                                                                             \
    2848   product(bool, UseInterpreter, true,                                       \
    2849           "Use interpreter for non-compiled methods")                       \
    2850                                                                             \
    2851   develop(bool, UseFastSignatureHandlers, true,                             \
    2852           "Use fast signature handlers for native calls")                   \
    2853                                                                             \
    2854   product(bool, UseLoopCounter, true,                                       \
    2855           "Increment invocation counter on backward branch")                \
    2856                                                                             \
    2857   product(bool, UseFastEmptyMethods, true,                                  \
    2858           "Use fast method entry code for empty methods")                   \
    2859                                                                             \
    2860   product(bool, UseFastAccessorMethods, true,                               \
    2861           "Use fast method entry code for accessor methods")                \
    2862                                                                             \
    2863   product_pd(bool, UseOnStackReplacement,                                   \
    2864           "Use on stack replacement, calls runtime if invoc. counter "      \
    2865           "overflows in loop")                                              \
    2866                                                                             \
    2867   notproduct(bool, TraceOnStackReplacement, false,                          \
    2868           "Trace on stack replacement")                                     \
    2869                                                                             \
    2870   product_pd(bool, PreferInterpreterNativeStubs,                            \
    2871           "Use always interpreter stubs for native methods invoked via "    \
    2872           "interpreter")                                                    \
    2873                                                                             \
    2874   develop(bool, CountBytecodes, false,                                      \
    2875           "Count number of bytecodes executed")                             \
    2876                                                                             \
    2877   develop(bool, PrintBytecodeHistogram, false,                              \
    2878           "Print histogram of the executed bytecodes")                      \
    2879                                                                             \
    2880   develop(bool, PrintBytecodePairHistogram, false,                          \
    2881           "Print histogram of the executed bytecode pairs")                 \
    2882                                                                             \
    2883   diagnostic(bool, PrintSignatureHandlers, false,                           \
    2884           "Print code generated for native method signature handlers")      \
    2885                                                                             \
    2886   develop(bool, VerifyOops, false,                                          \
    2887           "Do plausibility checks for oops")                                \
    2888                                                                             \
    2889   develop(bool, CheckUnhandledOops, false,                                  \
    2890           "Check for unhandled oops in VM code")                            \
    2891                                                                             \
    2892   develop(bool, VerifyJNIFields, trueInDebug,                               \
    2893           "Verify jfieldIDs for instance fields")                           \
    2894                                                                             \
    2895   notproduct(bool, VerifyJNIEnvThread, false,                               \
    2896           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
    2897           "from JNI")                                                       \
    2898                                                                             \
    2899   develop(bool, VerifyFPU, false,                                           \
    2900           "Verify FPU state (check for NaN's, etc.)")                       \
    2901                                                                             \
    2902   develop(bool, VerifyThread, false,                                        \
    2903           "Watch the thread register for corruption (SPARC only)")          \
    2904                                                                             \
    2905   develop(bool, VerifyActivationFrameSize, false,                           \
    2906           "Verify that activation frame didn't become smaller than its "    \
    2907           "minimal size")                                                   \
    2908                                                                             \
    2909   develop(bool, TraceFrequencyInlining, false,                              \
    2910           "Trace frequency based inlining")                                 \
    2911                                                                             \
    2912   develop_pd(bool, InlineIntrinsics,                                        \
    2913           "Inline intrinsics that can be statically resolved")              \
    2914                                                                             \
    2915   product_pd(bool, ProfileInterpreter,                                      \
    2916           "Profile at the bytecode level during interpretation")            \
    2917                                                                             \
    2918   develop(bool, TraceProfileInterpreter, false,                             \
    2919           "Trace profiling at the bytecode level during interpretation. "   \
    2920           "This outputs the profiling information collected to improve "    \
    2921           "jit compilation.")                                               \
    2922                                                                             \
    2923   develop_pd(bool, ProfileTraps,                                            \
    2924           "Profile deoptimization traps at the bytecode level")             \
    2925                                                                             \
    2926   product(intx, ProfileMaturityPercentage, 20,                              \
    2927           "number of method invocations/branches (expressed as % of "       \
    2928           "CompileThreshold) before using the method's profile")            \
    2929                                                                             \
    2930   develop(bool, PrintMethodData, false,                                     \
    2931           "Print the results of +ProfileInterpreter at end of run")         \
    2932                                                                             \
    2933   develop(bool, VerifyDataPointer, trueInDebug,                             \
    2934           "Verify the method data pointer during interpreter profiling")    \
    2935                                                                             \
    2936   develop(bool, VerifyCompiledCode, false,                                  \
    2937           "Include miscellaneous runtime verifications in nmethod code; "   \
    2938           "default off because it disturbs nmethod size heuristics")        \
    2939                                                                             \
    2940   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
    2941           "Manually make GC thread crash then dump java stack trace;  "     \
    2942           "Test only")                                                      \
    2943                                                                             \
    2944   /* compilation */                                                         \
    2945   product(bool, UseCompiler, true,                                          \
    2946           "Use Just-In-Time compilation")                                   \
    2947                                                                             \
    2948   develop(bool, TraceCompilationPolicy, false,                              \
    2949           "Trace compilation policy")                                       \
    2950                                                                             \
    2951   develop(bool, TimeCompilationPolicy, false,                               \
    2952           "Time the compilation policy")                                    \
    2953                                                                             \
    2954   product(bool, UseCounterDecay, true,                                      \
    2955           "Adjust recompilation counters")                                  \
    2956                                                                             \
    2957   develop(intx, CounterHalfLifeTime,    30,                                 \
    2958           "Half-life time of invocation counters (in seconds)")             \
    2959                                                                             \
    2960   develop(intx, CounterDecayMinIntervalLength,   500,                       \
    2961           "The minimum interval (in milliseconds) between invocation of "   \
    2962           "CounterDecay")                                                   \
    2963                                                                             \
    2964   product(bool, AlwaysCompileLoopMethods, false,                            \
    2965           "When using recompilation, never interpret methods "              \
    2966           "containing loops")                                               \
    2967                                                                             \
    2968   product(bool, DontCompileHugeMethods, true,                               \
    2969           "Do not compile methods > HugeMethodLimit")                       \
    2970                                                                             \
    2971   /* Bytecode escape analysis estimation. */                                \
    2972   product(bool, EstimateArgEscape, true,                                    \
    2973           "Analyze bytecodes to estimate escape state of arguments")        \
    2974                                                                             \
    2975   product(intx, BCEATraceLevel, 0,                                          \
    2976           "How much tracing to do of bytecode escape analysis estimates")   \
    2977                                                                             \
    2978   product(intx, MaxBCEAEstimateLevel, 5,                                    \
    2979           "Maximum number of nested calls that are analyzed by BC EA")      \
    2980                                                                             \
    2981   product(intx, MaxBCEAEstimateSize, 150,                                   \
    2982           "Maximum bytecode size of a method to be analyzed by BC EA")      \
    2983                                                                             \
    2984   product(intx,  AllocatePrefetchStyle, 1,                                  \
    2985           "0 = no prefetch, "                                               \
    2986           "1 = prefetch instructions for each allocation, "                 \
    2987           "2 = use TLAB watermark to gate allocation prefetch, "            \
    2988           "3 = use BIS instruction on Sparc for allocation prefetch")       \
    2989                                                                             \
    2990   product(intx,  AllocatePrefetchDistance, -1,                              \
    2991           "Distance to prefetch ahead of allocation pointer")               \
    2992                                                                             \
    2993   product(intx,  AllocatePrefetchLines, 3,                                  \
    2994           "Number of lines to prefetch ahead of array allocation pointer")  \
    2995                                                                             \
    2996   product(intx,  AllocateInstancePrefetchLines, 1,                          \
    2997           "Number of lines to prefetch ahead of instance allocation "       \
    2998           "pointer")                                                        \
    2999                                                                             \
    3000   product(intx,  AllocatePrefetchStepSize, 16,                              \
    3001           "Step size in bytes of sequential prefetch instructions")         \
    3002                                                                             \
    3003   product(intx,  AllocatePrefetchInstr, 0,                                  \
    3004           "Prefetch instruction to prefetch ahead of allocation pointer")   \
    3005                                                                             \
    3006   /* deoptimization */                                                      \
    3007   develop(bool, TraceDeoptimization, false,                                 \
    3008           "Trace deoptimization")                                           \
    3009                                                                             \
    3010   develop(bool, DebugDeoptimization, false,                                 \
    3011           "Tracing various information while debugging deoptimization")     \
    3012                                                                             \
    3013   product(intx, SelfDestructTimer, 0,                                       \
    3014           "Will cause VM to terminate after a given time (in minutes) "     \
    3015           "(0 means off)")                                                  \
    3016                                                                             \
    3017   product(intx, MaxJavaStackTraceDepth, 1024,                               \
    3018           "The maximum number of lines in the stack trace for Java "        \
    3019           "exceptions (0 means all)")                                       \
    3020                                                                             \
    3021   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
    3022           "Guarantee a safepoint (at least) every so many milliseconds "    \
    3023           "(0 means none)"))                                                \
    3024                                                                             \
    3025   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
    3026           "Guarantee a safepoint (at least) every so many milliseconds "    \
    3027           "(0 means none)"))                                                \
    3028                                                                             \
    3029   product(intx, SafepointTimeoutDelay, 10000,                               \
    3030           "Delay in milliseconds for option SafepointTimeout")              \
    3031                                                                             \
    3032   product(intx, NmethodSweepFraction, 16,                                   \
    3033           "Number of invocations of sweeper to cover all nmethods")         \
    3034                                                                             \
    3035   product(intx, NmethodSweepCheckInterval, 5,                               \
    3036           "Compilers wake up every n seconds to possibly sweep nmethods")   \
    3037                                                                             \
    3038   product(intx, NmethodSweepActivity, 10,                                   \
    3039           "Removes cold nmethods from code cache if > 0. Higher values "    \
    3040           "result in more aggressive sweeping")                             \
    3041                                                                             \
    3042   notproduct(bool, LogSweeper, false,                                       \
    3043           "Keep a ring buffer of sweeper activity")                         \
    3044                                                                             \
    3045   notproduct(intx, SweeperLogEntries, 1024,                                 \
    3046           "Number of records in the ring buffer of sweeper activity")       \
    3047                                                                             \
    3048   notproduct(intx, MemProfilingInterval, 500,                               \
    3049           "Time between each invocation of the MemProfiler")                \
    3050                                                                             \
    3051   develop(intx, MallocCatchPtr, -1,                                         \
    3052           "Hit breakpoint when mallocing/freeing this pointer")             \
    3053                                                                             \
    3054   notproduct(intx, AssertRepeat, 1,                                         \
    3055           "number of times to evaluate expression in assert "               \
    3056           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
    3057                                                                             \
    3058   notproduct(ccstrlist, SuppressErrorAt, "",                                \
    3059           "List of assertions (file:line) to muzzle")                       \
    3060                                                                             \
    3061   notproduct(uintx, HandleAllocationLimit, 1024,                            \
    3062           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
    3063           "is used")                                                        \
    3064                                                                             \
    3065   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
    3066           "Threshold for total handle allocation when "                     \
    3067           "+TraceHandleAllocation is used")                                 \
    3068                                                                             \
    3069   develop(intx, StackPrintLimit, 100,                                       \
    3070           "number of stack frames to print in VM-level stack dump")         \
    3071                                                                             \
    3072   notproduct(intx, MaxElementPrintSize, 256,                                \
    3073           "maximum number of elements to print")                            \
    3074                                                                             \
    3075   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
    3076           "maximum number of subklasses to print when printing klass")      \
    3077                                                                             \
    3078   product(intx, MaxInlineLevel, 9,                                          \
    3079           "maximum number of nested calls that are inlined")                \
    3080                                                                             \
    3081   product(intx, MaxRecursiveInlineLevel, 1,                                 \
    3082           "maximum number of nested recursive calls that are inlined")      \
    3083                                                                             \
    3084   develop(intx, MaxForceInlineLevel, 100,                                   \
    3085           "maximum number of nested calls that are forced for inlining "    \
    3086           "(using CompilerOracle or marked w/ @ForceInline)")               \
    3087                                                                             \
    3088   product_pd(intx, InlineSmallCode,                                         \
    3089           "Only inline already compiled methods if their code size is "     \
    3090           "less than this")                                                 \
    3091                                                                             \
    3092   product(intx, MaxInlineSize, 35,                                          \
    3093           "The maximum bytecode size of a method to be inlined")            \
    3094                                                                             \
    3095   product_pd(intx, FreqInlineSize,                                          \
    3096           "The maximum bytecode size of a frequent method to be inlined")   \
    3097                                                                             \
    3098   product(intx, MaxTrivialSize, 6,                                          \
    3099           "The maximum bytecode size of a trivial method to be inlined")    \
    3100                                                                             \
    3101   product(intx, MinInliningThreshold, 250,                                  \
    3102           "The minimum invocation count a method needs to have to be "      \
    3103           "inlined")                                                        \
    3104                                                                             \
    3105   develop(intx, MethodHistogramCutoff, 100,                                 \
    3106           "The cutoff value for method invocation histogram (+CountCalls)") \
    3107                                                                             \
    3108   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
    3109           "Number of interpreted methods to show in profile")               \
    3110                                                                             \
    3111   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
    3112           "Number of compiled methods to show in profile")                  \
    3113                                                                             \
    3114   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
    3115           "Number of stub methods to show in profile")                      \
    3116                                                                             \
    3117   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
    3118           "Number of runtime stub nodes to show in profile")                \
    3119                                                                             \
    3120   product(intx, ProfileIntervalsTicks, 100,                                 \
    3121           "Number of ticks between printing of interval profile "           \
    3122           "(+ProfileIntervals)")                                            \
    3123                                                                             \
    3124   notproduct(intx, ScavengeALotInterval,     1,                             \
    3125           "Interval between which scavenge will occur with +ScavengeALot")  \
    3126                                                                             \
    3127   notproduct(intx, FullGCALotInterval,     1,                               \
    3128           "Interval between which full gc will occur with +FullGCALot")     \
    3129                                                                             \
    3130   notproduct(intx, FullGCALotStart,     0,                                  \
    3131           "For which invocation to start FullGCAlot")                       \
    3132                                                                             \
    3133   notproduct(intx, FullGCALotDummies,  32*K,                                \
    3134           "Dummy object allocated with +FullGCALot, forcing all objects "   \
    3135           "to move")                                                        \
    3136                                                                             \
    3137   develop(intx, DontYieldALotInterval,    10,                               \
    3138           "Interval between which yields will be dropped (milliseconds)")   \
    3139                                                                             \
    3140   develop(intx, MinSleepInterval,     1,                                    \
    3141           "Minimum sleep() interval (milliseconds) when "                   \
    3142           "ConvertSleepToYield is off (used for Solaris)")                  \
    3143                                                                             \
    3144   develop(intx, ProfilerPCTickThreshold,    15,                             \
    3145           "Number of ticks in a PC buckets to be a hotspot")                \
    3146                                                                             \
    3147   notproduct(intx, DeoptimizeALotInterval,     5,                           \
    3148           "Number of exits until DeoptimizeALot kicks in")                  \
    3149                                                                             \
    3150   notproduct(intx, ZombieALotInterval,     5,                               \
    3151           "Number of exits until ZombieALot kicks in")                      \
    3152                                                                             \
    3153   diagnostic(intx, MallocVerifyInterval,     0,                             \
    3154           "If non-zero, verify C heap after every N calls to "              \
    3155           "malloc/realloc/free")                                            \
    3156                                                                             \
    3157   diagnostic(intx, MallocVerifyStart,     0,                                \
    3158           "If non-zero, start verifying C heap after Nth call to "          \
    3159           "malloc/realloc/free")                                            \
    3160                                                                             \
    3161   diagnostic(uintx, MallocMaxTestWords,     0,                              \
    3162           "If non-zero, maximum number of words that malloc/realloc can "   \
    3163           "allocate (for testing only)")                                    \
    3164                                                                             \
    3165   product(intx, TypeProfileWidth,     2,                                    \
    3166           "Number of receiver types to record in call/cast profile")        \
    3167                                                                             \
    3168   develop(intx, BciProfileWidth,      2,                                    \
    3169           "Number of return bci's to record in ret profile")                \
    3170                                                                             \
    3171   product(intx, PerMethodRecompilationCutoff, 400,                          \
    3172           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
    3173                                                                             \
    3174   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
    3175           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
    3176                                                                             \
    3177   product(intx, PerMethodTrapLimit,  100,                                   \
    3178           "Limit on traps (of one kind) in a method (includes inlines)")    \
    3179                                                                             \
    3180   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
    3181           "Limit on speculative traps (of one kind) in a method (includes inlines)") \
    3182                                                                             \
    3183   product(intx, PerBytecodeTrapLimit,  4,                                   \
    3184           "Limit on traps (of one kind) at a particular BCI")               \
    3185                                                                             \
    3186   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
    3187           "Extra method data trap entries for speculation")                 \
    3188                                                                             \
    3189   develop(intx, InlineFrequencyRatio,    20,                                \
    3190           "Ratio of call site execution to caller method invocation")       \
    3191                                                                             \
    3192   develop_pd(intx, InlineFrequencyCount,                                    \
    3193           "Count of call site execution necessary to trigger frequent "     \
    3194           "inlining")                                                       \
    3195                                                                             \
    3196   develop(intx, InlineThrowCount,    50,                                    \
    3197           "Force inlining of interpreted methods that throw this often")    \
    3198                                                                             \
    3199   develop(intx, InlineThrowMaxSize,   200,                                  \
    3200           "Force inlining of throwing methods smaller than this")           \
    3201                                                                             \
    3202   develop(intx, ProfilerNodeSize,  1024,                                    \
    3203           "Size in K to allocate for the Profile Nodes of each thread")     \
    3204                                                                             \
    3205   product_pd(intx, PreInflateSpin,                                          \
    3206           "Number of times to spin wait before inflation")                  \
    3207                                                                             \
    3208   /* gc parameters */                                                       \
    3209   product(uintx, InitialHeapSize, 0,                                        \
    3210           "Initial heap size (in bytes); zero means use ergonomics")        \
    3211                                                                             \
    3212   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
    3213           "Maximum heap size (in bytes)")                                   \
    3214                                                                             \
    3215   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
    3216           "Initial tenured generation size (in bytes)")                     \
    3217                                                                             \
    3218   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
    3219           "Initial new generation size (in bytes)")                         \
    3220                                                                             \
    3221   product(uintx, MaxNewSize, max_uintx,                                     \
    3222           "Maximum new generation size (in bytes), max_uintx means set "    \
    3223           "ergonomically")                                                  \
    3224                                                                             \
    3225   product(uintx, PretenureSizeThreshold, 0,                                 \
    3226           "Maximum size in bytes of objects allocated in DefNew "           \
    3227           "generation; zero means no maximum")                              \
    3228                                                                             \
    3229   product(uintx, TLABSize, 0,                                               \
    3230           "Starting TLAB size (in bytes); zero means set ergonomically")    \
    3231                                                                             \
    3232   product(uintx, MinTLABSize, 2*K,                                          \
    3233           "Minimum allowed TLAB size (in bytes)")                           \
    3234                                                                             \
    3235   product(uintx, TLABAllocationWeight, 35,                                  \
    3236           "Allocation averaging weight")                                    \
    3237                                                                             \
    3238   product(uintx, TLABWasteTargetPercent, 1,                                 \
    3239           "Percentage of Eden that can be wasted")                          \
    3240                                                                             \
    3241   product(uintx, TLABRefillWasteFraction,    64,                            \
    3242           "Maximum TLAB waste at a refill (internal fragmentation)")        \
    3243                                                                             \
    3244   product(uintx, TLABWasteIncrement,    4,                                  \
    3245           "Increment allowed waste at slow allocation")                     \
    3246                                                                             \
    3247   product(uintx, SurvivorRatio, 8,                                          \
    3248           "Ratio of eden/survivor space size")                              \
    3249                                                                             \
    3250   product(uintx, NewRatio, 2,                                               \
    3251           "Ratio of old/new generation sizes")                              \
    3252                                                                             \
    3253   product_pd(uintx, NewSizeThreadIncrease,                                  \
    3254           "Additional size added to desired new generation size per "       \
    3255           "non-daemon thread (in bytes)")                                   \
    3256                                                                             \
    3257   product_pd(uintx, MetaspaceSize,                                          \
    3258           "Initial size of Metaspaces (in bytes)")                          \
    3259                                                                             \
    3260   product(uintx, MaxMetaspaceSize, max_uintx,                               \
    3261           "Maximum size of Metaspaces (in bytes)")                          \
    3262                                                                             \
    3263   product(uintx, CompressedClassSpaceSize, 1*G,                             \
    3264           "Maximum size of class area in Metaspace when compressed "        \
    3265           "class pointers are used")                                        \
    3266                                                                             \
    3267   manageable(uintx, MinHeapFreeRatio, 40,                                   \
    3268           "The minimum percentage of heap free after GC to avoid expansion."\
    3269           " For most GCs this applies to the old generation. In G1 and"     \
    3270           " ParallelGC it applies to the whole heap.")                      \
    3271                                                                             \
    3272   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
    3273           "The maximum percentage of heap free after GC to avoid shrinking."\
    3274           " For most GCs this applies to the old generation. In G1 and"     \
    3275           " ParallelGC it applies to the whole heap.")                      \
    3276                                                                             \
    3277   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
    3278           "Number of milliseconds per MB of free space in the heap")        \
    3279                                                                             \
    3280   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
    3281           "The minimum change in heap space due to GC (in bytes)")          \
    3282                                                                             \
    3283   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
    3284           "The minimum expansion of Metaspace (in bytes)")                  \
    3285                                                                             \
    3286   product(uintx, MinMetaspaceFreeRatio,    40,                              \
    3287           "The minimum percentage of Metaspace free after GC to avoid "     \
    3288           "expansion")                                                      \
    3289                                                                             \
    3290   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
    3291           "The maximum percentage of Metaspace free after GC to avoid "     \
    3292           "shrinking")                                                      \
    3293                                                                             \
    3294   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
    3295           "The maximum expansion of Metaspace without full GC (in bytes)")  \
    3296                                                                             \
    3297   product(uintx, QueuedAllocationWarningCount, 0,                           \
    3298           "Number of times an allocation that queues behind a GC "          \
    3299           "will retry before printing a warning")                           \
    3300                                                                             \
    3301   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
    3302           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
    3303                                                                             \
    3304   diagnostic(intx, VerifyGCLevel,     0,                                    \
    3305           "Generation level at which to start +VerifyBefore/AfterGC")       \
    3306                                                                             \
    3307   product(uintx, MaxTenuringThreshold,    15,                               \
    3308           "Maximum value for tenuring threshold")                           \
    3309                                                                             \
    3310   product(uintx, InitialTenuringThreshold,    7,                            \
    3311           "Initial value for tenuring threshold")                           \
    3312                                                                             \
    3313   product(uintx, TargetSurvivorRatio,    50,                                \
    3314           "Desired percentage of survivor space used after scavenge")       \
    3315                                                                             \
    3316   product(uintx, MarkSweepDeadRatio,     5,                                 \
    3317           "Percentage (0-100) of the old gen allowed as dead wood. "        \
    3318           "Serial mark sweep treats this as both the minimum and maximum "  \
    3319           "value. "                                                         \
    3320           "CMS uses this value only if it falls back to mark sweep. "       \
    3321           "Par compact uses a variable scale based on the density of the "  \
    3322           "generation and treats this as the maximum value when the heap "  \
    3323           "is either completely full or completely empty.  Par compact "    \
    3324           "also has a smaller default value; see arguments.cpp.")           \
    3325                                                                             \
    3326   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
    3327           "How often should we fully compact the heap (ignoring the dead "  \
    3328           "space parameters)")                                              \
    3329                                                                             \
    3330   product(intx, PrintCMSStatistics, 0,                                      \
    3331           "Statistics for CMS")                                             \
    3332                                                                             \
    3333   product(bool, PrintCMSInitiationStatistics, false,                        \
    3334           "Statistics for initiating a CMS collection")                     \
    3335                                                                             \
    3336   product(intx, PrintFLSStatistics, 0,                                      \
    3337           "Statistics for CMS' FreeListSpace")                              \
    3338                                                                             \
    3339   product(intx, PrintFLSCensus, 0,                                          \
    3340           "Census for CMS' FreeListSpace")                                  \
    3341                                                                             \
    3342   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
    3343           "Delay between expansion and allocation (in milliseconds)")       \
    3344                                                                             \
    3345   develop(uintx, GCWorkerDelayMillis, 0,                                    \
    3346           "Delay in scheduling GC workers (in milliseconds)")               \
    3347                                                                             \
    3348   product(intx, DeferThrSuspendLoopCount,     4000,                         \
    3349           "(Unstable) Number of times to iterate in safepoint loop "        \
    3350           "before blocking VM threads ")                                    \
    3351                                                                             \
    3352   product(intx, DeferPollingPageLoopCount,     -1,                          \
    3353           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
    3354           "before changing safepoint polling page to RO ")                  \
    3355                                                                             \
    3356   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
    3357                                                                             \
    3358   product(bool, PSChunkLargeArrays, true,                                   \
    3359           "Process large arrays in chunks")                                 \
    3360                                                                             \
    3361   product(uintx, GCDrainStackTargetSize, 64,                                \
    3362           "Number of entries we will try to leave on the stack "            \
    3363           "during parallel gc")                                             \
    3364                                                                             \
    3365   /* stack parameters */                                                    \
    3366   product_pd(intx, StackYellowPages,                                        \
    3367           "Number of yellow zone (recoverable overflows) pages")            \
    3368                                                                             \
    3369   product_pd(intx, StackRedPages,                                           \
    3370           "Number of red zone (unrecoverable overflows) pages")             \
    3371                                                                             \
    3372   product_pd(intx, StackShadowPages,                                        \
    3373           "Number of shadow zone (for overflow checking) pages "            \
    3374           "this should exceed the depth of the VM and native call stack")   \
    3375                                                                             \
    3376   product_pd(intx, ThreadStackSize,                                         \
    3377           "Thread Stack Size (in Kbytes)")                                  \
    3378                                                                             \
    3379   product_pd(intx, VMThreadStackSize,                                       \
    3380           "Non-Java Thread Stack Size (in Kbytes)")                         \
    3381                                                                             \
    3382   product_pd(intx, CompilerThreadStackSize,                                 \
    3383           "Compiler Thread Stack Size (in Kbytes)")                         \
    3384                                                                             \
    3385   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
    3386           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
    3387                                                                             \
    3388   product(uintx, ThreadSafetyMargin, 50*M,                                  \
    3389           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
    3390           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
    3391           "disable this feature")                                           \
    3392                                                                             \
    3393   /* code cache parameters */                                               \
    3394   /* ppc64 has large code-entry alignment. */                               \
    3395   develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64),                  \
    3396           "Code cache segment size (in bytes) - smallest unit of "          \
    3397           "allocation")                                                     \
    3398                                                                             \
    3399   develop_pd(intx, CodeEntryAlignment,                                      \
    3400           "Code entry alignment for generated code (in bytes)")             \
    3401                                                                             \
    3402   product_pd(intx, OptoLoopAlignment,                                       \
    3403           "Align inner loops to zero relative to this modulus")             \
    3404                                                                             \
    3405   product_pd(uintx, InitialCodeCacheSize,                                   \
    3406           "Initial code cache size (in bytes)")                             \
    3407                                                                             \
    3408   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
    3409           "Minimum code cache size (in bytes) required to start VM.")       \
    3410                                                                             \
    3411   product_pd(uintx, ReservedCodeCacheSize,                                  \
    3412           "Reserved code cache size (in bytes) - maximum code cache size")  \
    3413                                                                             \
    3414   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
    3415           "When less than X space left, we stop compiling")                 \
    3416                                                                             \
    3417   product_pd(uintx, CodeCacheExpansionSize,                                 \
    3418           "Code cache expansion size (in bytes)")                           \
    3419                                                                             \
    3420   develop_pd(uintx, CodeCacheMinBlockLength,                                \
    3421           "Minimum number of segments in a code cache block")               \
    3422                                                                             \
    3423   notproduct(bool, ExitOnFullCodeCache, false,                              \
    3424           "Exit the VM if we fill the code cache")                          \
    3425                                                                             \
    3426   product(bool, UseCodeCacheFlushing, true,                                 \
    3427           "Remove cold/old nmethods from the code cache")                   \
    3428                                                                             \
    3429   /* interpreter debugging */                                               \
    3430   develop(intx, BinarySwitchThreshold, 5,                                   \
    3431           "Minimal number of lookupswitch entries for rewriting to binary " \
    3432           "switch")                                                         \
    3433                                                                             \
    3434   develop(intx, StopInterpreterAt, 0,                                       \
    3435           "Stop interpreter execution at specified bytecode number")        \
    3436                                                                             \
    3437   develop(intx, TraceBytecodesAt, 0,                                        \
    3438           "Trace bytecodes starting with specified bytecode number")        \
    3439                                                                             \
    3440   /* compiler interface */                                                  \
    3441   develop(intx, CIStart, 0,                                                 \
    3442           "The id of the first compilation to permit")                      \
    3443                                                                             \
    3444   develop(intx, CIStop, max_jint,                                           \
    3445           "The id of the last compilation to permit")                       \
    3446                                                                             \
    3447   develop(intx, CIStartOSR, 0,                                              \
    3448           "The id of the first osr compilation to permit "                  \
    3449           "(CICountOSR must be on)")                                        \
    3450                                                                             \
    3451   develop(intx, CIStopOSR, max_jint,                                        \
    3452           "The id of the last osr compilation to permit "                   \
    3453           "(CICountOSR must be on)")                                        \
    3454                                                                             \
    3455   develop(intx, CIBreakAtOSR, -1,                                           \
    3456           "The id of osr compilation to break at")                          \
    3457                                                                             \
    3458   develop(intx, CIBreakAt, -1,                                              \
    3459           "The id of compilation to break at")                              \
    3460                                                                             \
    3461   product(ccstrlist, CompileOnly, "",                                       \
    3462           "List of methods (pkg/class.name) to restrict compilation to")    \
    3463                                                                             \
    3464   product(ccstr, CompileCommandFile, NULL,                                  \
    3465           "Read compiler commands from this file [.hotspot_compiler]")      \
    3466                                                                             \
    3467   product(ccstrlist, CompileCommand, "",                                    \
    3468           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
    3469                                                                             \
    3470   develop(bool, ReplayCompiles, false,                                      \
    3471           "Enable replay of compilations from ReplayDataFile")              \
    3472                                                                             \
    3473   product(ccstr, ReplayDataFile, NULL,                                      \
    3474           "File containing compilation replay information"                  \
    3475           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
    3476                                                                             \
    3477    product(ccstr, InlineDataFile, NULL,                                     \
    3478           "File containing inlining replay information"                     \
    3479           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
    3480                                                                             \
    3481   develop(intx, ReplaySuppressInitializers, 2,                              \
    3482           "Control handling of class initialization during replay: "        \
    3483           "0 - don't do anything special; "                                 \
    3484           "1 - treat all class initializers as empty; "                     \
    3485           "2 - treat class initializers for application classes as empty; " \
    3486           "3 - allow all class initializers to run during bootstrap but "   \
    3487           "    pretend they are empty after starting replay")               \
    3488                                                                             \
    3489   develop(bool, ReplayIgnoreInitErrors, false,                              \
    3490           "Ignore exceptions thrown during initialization for replay")      \
    3491                                                                             \
    3492   product(bool, DumpReplayDataOnError, true,                                \
    3493           "Record replay data for crashing compiler threads")               \
    3494                                                                             \
    3495   product(bool, CICompilerCountPerCPU, false,                               \
    3496           "1 compiler thread for log(N CPUs)")                              \
    3497                                                                             \
    3498   develop(intx, CIFireOOMAt,    -1,                                         \
    3499           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
    3500           "(non-negative value throws OOM after this many CI accesses "     \
    3501           "in each compile)")                                               \
    3502   notproduct(intx, CICrashAt, -1,                                           \
    3503           "id of compilation to trigger assert in compiler thread for "     \
    3504           "the purpose of testing, e.g. generation of replay data")         \
    3505   notproduct(bool, CIObjectFactoryVerify, false,                            \
    3506           "enable potentially expensive verification in ciObjectFactory")   \
    3507                                                                             \
    3508   /* Priorities */                                                          \
    3509   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
    3510                                                                             \
    3511   product(intx, ThreadPriorityPolicy, 0,                                    \
    3512           "0 : Normal.                                                     "\
    3513           "    VM chooses priorities that are appropriate for normal       "\
    3514           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
    3515           "    to normal native priority. Java priorities below "           \
    3516           "    NORM_PRIORITY map to lower native priority values. On       "\
    3517           "    Windows applications are allowed to use higher native       "\
    3518           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
    3519           "    not use the highest possible native priority,               "\
    3520           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
    3521           "    system threads. On Linux thread priorities are ignored      "\
    3522           "    because the OS does not support static priority in          "\
    3523           "    SCHED_OTHER scheduling class which is the only choice for   "\
    3524           "    non-root, non-realtime applications.                        "\
    3525           "1 : Aggressive.                                                 "\
    3526           "    Java thread priorities map over to the entire range of      "\
    3527           "    native thread priorities. Higher Java thread priorities map "\
    3528           "    to higher native thread priorities. This policy should be   "\
    3529           "    used with care, as sometimes it can cause performance       "\
    3530           "    degradation in the application and/or the entire system. On "\
    3531           "    Linux this policy requires root privilege.")                 \
    3532                                                                             \
    3533   product(bool, ThreadPriorityVerbose, false,                               \
    3534           "Print priority changes")                                         \
    3535                                                                             \
    3536   product(intx, DefaultThreadPriority, -1,                                  \
    3537           "The native priority at which threads run if not elsewhere "      \
    3538           "specified (-1 means no change)")                                 \
    3539                                                                             \
    3540   product(intx, CompilerThreadPriority, -1,                                 \
    3541           "The native priority at which compiler threads should run "       \
    3542           "(-1 means no change)")                                           \
    3543                                                                             \
    3544   product(intx, VMThreadPriority, -1,                                       \
    3545           "The native priority at which the VM thread should run "          \
    3546           "(-1 means no change)")                                           \
    3547                                                                             \
    3548   product(bool, CompilerThreadHintNoPreempt, true,                          \
    3549           "(Solaris only) Give compiler threads an extra quanta")           \
    3550                                                                             \
    3551   product(bool, VMThreadHintNoPreempt, false,                               \
    3552           "(Solaris only) Give VM thread an extra quanta")                  \
    3553                                                                             \
    3554   product(intx, JavaPriority1_To_OSPriority, -1,                            \
    3555           "Map Java priorities to OS priorities")                           \
    3556                                                                             \
    3557   product(intx, JavaPriority2_To_OSPriority, -1,                            \
    3558           "Map Java priorities to OS priorities")                           \
    3559                                                                             \
    3560   product(intx, JavaPriority3_To_OSPriority, -1,                            \
    3561           "Map Java priorities to OS priorities")                           \
    3562                                                                             \
    3563   product(intx, JavaPriority4_To_OSPriority, -1,                            \
    3564           "Map Java priorities to OS priorities")                           \
    3565                                                                             \
    3566   product(intx, JavaPriority5_To_OSPriority, -1,                            \
    3567           "Map Java priorities to OS priorities")                           \
    3568                                                                             \
    3569   product(intx, JavaPriority6_To_OSPriority, -1,                            \
    3570           "Map Java priorities to OS priorities")                           \
    3571                                                                             \
    3572   product(intx, JavaPriority7_To_OSPriority, -1,                            \
    3573           "Map Java priorities to OS priorities")                           \
    3574                                                                             \
    3575   product(intx, JavaPriority8_To_OSPriority, -1,                            \
    3576           "Map Java priorities to OS priorities")                           \
    3577                                                                             \
    3578   product(intx, JavaPriority9_To_OSPriority, -1,                            \
    3579           "Map Java priorities to OS priorities")                           \
    3580                                                                             \
    3581   product(intx, JavaPriority10_To_OSPriority,-1,                            \
    3582           "Map Java priorities to OS priorities")                           \
    3583                                                                             \
    3584   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
    3585           "Java thread priority 10 maps to critical scheduling priority")   \
    3586                                                                             \
    3587   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
    3588           "Compiler thread(s) run at critical scheduling priority")         \
    3589                                                                             \
    3590   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
    3591           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
    3592                                                                             \
    3593   /* compiler debugging */                                                  \
    3594   notproduct(intx, CompileTheWorldStartAt,     1,                           \
    3595           "First class to consider when using +CompileTheWorld")            \
    3596                                                                             \
    3597   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
    3598           "Last class to consider when using +CompileTheWorld")             \
    3599                                                                             \
    3600   develop(intx, NewCodeParameter,      0,                                   \
    3601           "Testing Only: Create a dedicated integer parameter before "      \
    3602           "putback")                                                        \
    3603                                                                             \
    3604   /* new oopmap storage allocation */                                       \
    3605   develop(intx, MinOopMapAllocation,     8,                                 \
    3606           "Minimum number of OopMap entries in an OopMapSet")               \
    3607                                                                             \
    3608   /* Background Compilation */                                              \
    3609   develop(intx, LongCompileThreshold,     50,                               \
    3610           "Used with +TraceLongCompiles")                                   \
    3611                                                                             \
    3612   product(intx, StarvationMonitorInterval,    200,                          \
    3613           "Pause between each check (in milliseconds)")                     \
    3614                                                                             \
    3615   /* recompilation */                                                       \
    3616   product_pd(intx, CompileThreshold,                                        \
    3617           "number of interpreted method invocations before (re-)compiling") \
    3618                                                                             \
    3619   product_pd(intx, BackEdgeThreshold,                                       \
    3620           "Interpreter Back edge threshold at which an OSR compilation is " \
    3621           "invoked")                                                        \
    3622                                                                             \
    3623   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
    3624           "Interpreter (tier 0) invocation notification frequency")         \
    3625                                                                             \
    3626   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
    3627           "C1 without MDO (tier 2) invocation notification frequency")      \
    3628                                                                             \
    3629   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
    3630           "C1 with MDO profiling (tier 3) invocation notification "         \
    3631           "frequency")                                                      \
    3632                                                                             \
    3633   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
    3634           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
    3635                                                                             \
    3636   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
    3637           "Interpreter (tier 0) invocation notification frequency")         \
    3638                                                                             \
    3639   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
    3640           "C1 without MDO (tier 2) invocation notification frequency")      \
    3641                                                                             \
    3642   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
    3643           "C1 with MDO profiling (tier 3) invocation notification "         \
    3644           "frequency")                                                      \
    3645                                                                             \
    3646   product(intx, Tier2CompileThreshold, 0,                                   \
    3647           "threshold at which tier 2 compilation is invoked")               \
    3648                                                                             \
    3649   product(intx, Tier2BackEdgeThreshold, 0,                                  \
    3650           "Back edge threshold at which tier 2 compilation is invoked")     \
    3651                                                                             \
    3652   product(intx, Tier3InvocationThreshold, 200,                              \
    3653           "Compile if number of method invocations crosses this "           \
    3654           "threshold")                                                      \
    3655                                                                             \
    3656   product(intx, Tier3MinInvocationThreshold, 100,                           \
    3657           "Minimum invocation to compile at tier 3")                        \
    3658                                                                             \
    3659   product(intx, Tier3CompileThreshold, 2000,                                \
    3660           "Threshold at which tier 3 compilation is invoked (invocation "   \
    3661           "minimum must be satisfied")                                      \
    3662                                                                             \
    3663   product(intx, Tier3BackEdgeThreshold,  60000,                             \
    3664           "Back edge threshold at which tier 3 OSR compilation is invoked") \
    3665                                                                             \
    3666   product(intx, Tier4InvocationThreshold, 5000,                             \
    3667           "Compile if number of method invocations crosses this "           \
    3668           "threshold")                                                      \
    3669                                                                             \
    3670   product(intx, Tier4MinInvocationThreshold, 600,                           \
    3671           "Minimum invocation to compile at tier 4")                        \
    3672                                                                             \
    3673   product(intx, Tier4CompileThreshold, 15000,                               \
    3674           "Threshold at which tier 4 compilation is invoked (invocation "   \
    3675           "minimum must be satisfied")                                      \
    3676                                                                             \
    3677   product(intx, Tier4BackEdgeThreshold, 40000,                              \
    3678           "Back edge threshold at which tier 4 OSR compilation is invoked") \
    3679                                                                             \
    3680   product(intx, Tier3DelayOn, 5,                                            \
    3681           "If C2 queue size grows over this amount per compiler thread "    \
    3682           "stop compiling at tier 3 and start compiling at tier 2")         \
    3683                                                                             \
    3684   product(intx, Tier3DelayOff, 2,                                           \
    3685           "If C2 queue size is less than this amount per compiler thread "  \
    3686           "allow methods compiled at tier 2 transition to tier 3")          \
    3687                                                                             \
    3688   product(intx, Tier3LoadFeedback, 5,                                       \
    3689           "Tier 3 thresholds will increase twofold when C1 queue size "     \
    3690           "reaches this amount per compiler thread")                        \
    3691                                                                             \
    3692   product(intx, Tier4LoadFeedback, 3,                                       \
    3693           "Tier 4 thresholds will increase twofold when C2 queue size "     \
    3694           "reaches this amount per compiler thread")                        \
    3695                                                                             \
    3696   product(intx, TieredCompileTaskTimeout, 50,                               \
    3697           "Kill compile task if method was not used within "                \
    3698           "given timeout in milliseconds")                                  \
    3699                                                                             \
    3700   product(intx, TieredStopAtLevel, 4,                                       \
    3701           "Stop at given compilation level")                                \
    3702                                                                             \
    3703   product(intx, Tier0ProfilingStartPercentage, 200,                         \
    3704           "Start profiling in interpreter if the counters exceed tier 3 "   \
    3705           "thresholds by the specified percentage")                         \
    3706                                                                             \
    3707   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
    3708           "Increase the compile threshold for C1 compilation if the code "  \
    3709           "cache is filled by the specified percentage")                    \
    3710                                                                             \
    3711   product(intx, TieredRateUpdateMinTime, 1,                                 \
    3712           "Minimum rate sampling interval (in milliseconds)")               \
    3713                                                                             \
    3714   product(intx, TieredRateUpdateMaxTime, 25,                                \
    3715           "Maximum rate sampling interval (in milliseconds)")               \
    3716                                                                             \
    3717   product_pd(bool, TieredCompilation,                                       \
    3718           "Enable tiered compilation")                                      \
    3719                                                                             \
    3720   product(bool, PrintTieredEvents, false,                                   \
    3721           "Print tiered events notifications")                              \
    3722                                                                             \
    3723   product_pd(intx, OnStackReplacePercentage,                                \
    3724           "NON_TIERED number of method invocations/branches (expressed as " \
    3725           "% of CompileThreshold) before (re-)compiling OSR code")          \
    3726                                                                             \
    3727   product(intx, InterpreterProfilePercentage, 33,                           \
    3728           "NON_TIERED number of method invocations/branches (expressed as " \
    3729           "% of CompileThreshold) before profiling in the interpreter")     \
    3730                                                                             \
    3731   develop(intx, MaxRecompilationSearchLength,    10,                        \
    3732           "The maximum number of frames to inspect when searching for "     \
    3733           "recompilee")                                                     \
    3734                                                                             \
    3735   develop(intx, MaxInterpretedSearchLength,     3,                          \
    3736           "The maximum number of interpreted frames to skip when searching "\
    3737           "for recompilee")                                                 \
    3738                                                                             \
    3739   develop(intx, DesiredMethodLimit,  8000,                                  \
    3740           "The desired maximum method size (in bytecodes) after inlining")  \
    3741                                                                             \
    3742   develop(intx, HugeMethodLimit,  8000,                                     \
    3743           "Don't compile methods larger than this if "                      \
    3744           "+DontCompileHugeMethods")                                        \
    3745                                                                             \
    3746   /* New JDK 1.4 reflection implementation */                               \
    3747                                                                             \
    3748   develop(bool, UseNewReflection, true,                                     \
    3749           "Temporary flag for transition to reflection based on dynamic "   \
    3750           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
    3751           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
    3752           "changes were needed")                                            \
    3753                                                                             \
    3754   develop(bool, VerifyReflectionBytecodes, false,                           \
    3755           "Force verification of 1.4 reflection bytecodes. Does not work "  \
    3756           "in situations like that described in 4486457 or for "            \
    3757           "constructors generated for serialization, so can not be enabled "\
    3758           "in product.")                                                    \
    3759                                                                             \
    3760   product(bool, ReflectionWrapResolutionErrors, true,                       \
    3761           "Temporary flag for transition to AbstractMethodError wrapped "   \
    3762           "in InvocationTargetException. See 6531596")                      \
    3763                                                                             \
    3764   develop(intx, FastSuperclassLimit, 8,                                     \
    3765           "Depth of hardwired instanceof accelerator array")                \
    3766                                                                             \
    3767   /* Properties for Java libraries  */                                      \
    3768                                                                             \
    3769   product(uintx, MaxDirectMemorySize, 0,                                    \
    3770           "Maximum total size of NIO direct-buffer allocations")            \
    3771                                                                             \
    3772   /* temporary developer defined flags  */                                  \
    3773                                                                             \
    3774   diagnostic(bool, UseNewCode, false,                                       \
    3775           "Testing Only: Use the new version while testing")                \
    3776                                                                             \
    3777   diagnostic(bool, UseNewCode2, false,                                      \
    3778           "Testing Only: Use the new version while testing")                \
    3779                                                                             \
    3780   diagnostic(bool, UseNewCode3, false,                                      \
    3781           "Testing Only: Use the new version while testing")                \
    3782                                                                             \
    3783   /* flags for performance data collection */                               \
    3784                                                                             \
    3785   product(bool, UsePerfData, falseInEmbedded,                               \
    3786           "Flag to disable jvmstat instrumentation for performance testing "\
    3787           "and problem isolation purposes")                                 \
    3788                                                                             \
    3789   product(bool, PerfDataSaveToFile, false,                                  \
    3790           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
    3791                                                                             \
    3792   product(ccstr, PerfDataSaveFile, NULL,                                    \
    3793           "Save PerfData memory to the specified absolute pathname. "       \
    3794           "The string %p in the file name (if present) "                    \
    3795           "will be replaced by pid")                                        \
    3796                                                                             \
    3797   product(intx, PerfDataSamplingInterval, 50,                               \
    3798           "Data sampling interval (in milliseconds)")                       \
    3799                                                                             \
    3800   develop(bool, PerfTraceDataCreation, false,                               \
    3801           "Trace creation of Performance Data Entries")                     \
    3802                                                                             \
    3803   develop(bool, PerfTraceMemOps, false,                                     \
    3804           "Trace PerfMemory create/attach/detach calls")                    \
    3805                                                                             \
    3806   product(bool, PerfDisableSharedMem, false,                                \
    3807           "Store performance data in standard memory")                      \
    3808                                                                             \
    3809   product(intx, PerfDataMemorySize, 32*K,                                   \
    3810           "Size of performance data memory region. Will be rounded "        \
    3811           "up to a multiple of the native os page size.")                   \
    3812                                                                             \
    3813   product(intx, PerfMaxStringConstLength, 1024,                             \
    3814           "Maximum PerfStringConstant string length before truncation")     \
    3815                                                                             \
    3816   product(bool, PerfAllowAtExitRegistration, false,                         \
    3817           "Allow registration of atexit() methods")                         \
    3818                                                                             \
    3819   product(bool, PerfBypassFileSystemCheck, false,                           \
    3820           "Bypass Win32 file system criteria checks (Windows Only)")        \
    3821                                                                             \
    3822   product(intx, UnguardOnExecutionViolation, 0,                             \
    3823           "Unguard page and retry on no-execute fault (Win32 only) "        \
    3824           "0=off, 1=conservative, 2=aggressive")                            \
    3825                                                                             \
    3826   /* Serviceability Support */                                              \
    3827                                                                             \
    3828   product(bool, ManagementServer, false,                                    \
    3829           "Create JMX Management Server")                                   \
    3830                                                                             \
    3831   product(bool, DisableAttachMechanism, false,                              \
    3832           "Disable mechanism that allows tools to attach to this VM")       \
    3833                                                                             \
    3834   product(bool, StartAttachListener, false,                                 \
    3835           "Always start Attach Listener at VM startup")                     \
    3836                                                                             \
    3837   manageable(bool, PrintConcurrentLocks, false,                             \
    3838           "Print java.util.concurrent locks in thread dump")                \
    3839                                                                             \
    3840   product(bool, TransmitErrorReport, false,                                 \
    3841           "Enable error report transmission on erroneous termination")      \
    3842                                                                             \
    3843   product(ccstr, ErrorReportServer, NULL,                                   \
    3844           "Override built-in error report server address")                  \
    3845                                                                             \
    3846   /* Shared spaces */                                                       \
    3847                                                                             \
    3848   product(bool, UseSharedSpaces, true,                                      \
    3849           "Use shared spaces for metadata")                                 \
    3850                                                                             \
    3851   product(bool, VerifySharedSpaces, false,                                  \
    3852           "Verify shared spaces (false for default archive, true for "      \
    3853           "archive specified by -XX:SharedArchiveFile)")                    \
    3854                                                                             \
    3855   product(bool, RequireSharedSpaces, false,                                 \
    3856           "Require shared spaces for metadata")                             \
    3857                                                                             \
    3858   product(bool, DumpSharedSpaces, false,                                    \
    3859           "Special mode: JVM reads a class list, loads classes, builds "    \
    3860           "shared spaces, and dumps the shared spaces to a file to be "     \
    3861           "used in future JVM runs")                                        \
    3862                                                                             \
    3863   product(bool, PrintSharedSpaces, false,                                   \
    3864           "Print usage of shared spaces")                                   \
    3865                                                                             \
    3866   product(bool, PrintSharedArchiveAndExit, false,                           \
    3867           "Print shared archive file contents")                             \
    3868                                                                             \
    3869   product(bool, PrintSharedDictionary, false,                               \
    3870           "If PrintSharedArchiveAndExit is true, also print the shared "    \
    3871           "dictionary")                                                     \
    3872                                                                             \
    3873   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
    3874           "Size of read-write space for metadata (in bytes)")               \
    3875                                                                             \
    3876   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
    3877           "Size of read-only space for metadata (in bytes)")                \
    3878                                                                             \
    3879   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
    3880           "Size of the shared miscellaneous data area (in bytes)")          \
    3881                                                                             \
    3882   product(uintx, SharedMiscCodeSize,    120*K,                              \
    3883           "Size of the shared miscellaneous code area (in bytes)")          \
    3884                                                                             \
    3885   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
    3886           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
    3887           "Address to allocate shared memory region for class data")        \
    3888                                                                             \
    3889   diagnostic(bool, EnableInvokeDynamic, true,                               \
    3890           "support JSR 292 (method handles, invokedynamic, "                \
    3891           "anonymous classes")                                              \
    3892                                                                             \
    3893   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
    3894           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
    3895           "classes. Just exclude them from the shared dictionary.")         \
    3896                                                                             \
    3897   diagnostic(bool, PrintMethodHandleStubs, false,                           \
    3898           "Print generated stub code for method handles")                   \
    3899                                                                             \
    3900   develop(bool, TraceMethodHandles, false,                                  \
    3901           "trace internal method handle operations")                        \
    3902                                                                             \
    3903   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
    3904           "perform extra checks when constructing method handles")          \
    3905                                                                             \
    3906   diagnostic(bool, ShowHiddenFrames, false,                                 \
    3907           "show method handle implementation frames (usually hidden)")      \
    3908                                                                             \
    3909   experimental(bool, TrustFinalNonStaticFields, false,                      \
    3910           "trust final non-static declarations for constant folding")       \
    3911                                                                             \
    3912   diagnostic(bool, FoldStableValues, true,                                  \
    3913           "Optimize loads from stable fields (marked w/ @Stable)")          \
    3914                                                                             \
    3915   develop(bool, TraceInvokeDynamic, false,                                  \
    3916           "trace internal invoke dynamic operations")                       \
    3917                                                                             \
    3918   diagnostic(bool, PauseAtStartup,      false,                              \
    3919           "Causes the VM to pause at startup time and wait for the pause "  \
    3920           "file to be removed (default: ./vm.paused.<pid>)")                \
    3921                                                                             \
    3922   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
    3923           "The file to create and for whose removal to await when pausing " \
    3924           "at startup. (default: ./vm.paused.<pid>)")                       \
    3925                                                                             \
    3926   diagnostic(bool, PauseAtExit, false,                                      \
    3927           "Pause and wait for keypress on exit if a debugger is attached")  \
    3928                                                                             \
    3929   product(bool, ExtendedDTraceProbes,    false,                             \
    3930           "Enable performance-impacting dtrace probes")                     \
    3931                                                                             \
    3932   product(bool, DTraceMethodProbes, false,                                  \
    3933           "Enable dtrace probes for method-entry and method-exit")          \
    3934                                                                             \
    3935   product(bool, DTraceAllocProbes, false,                                   \
    3936           "Enable dtrace probes for object allocation")                     \
    3937                                                                             \
    3938   product(bool, DTraceMonitorProbes, false,                                 \
    3939           "Enable dtrace probes for monitor events")                        \
    3940                                                                             \
    3941   product(bool, RelaxAccessControlCheck, false,                             \
    3942           "Relax the access control checks in the verifier")                \
    3943                                                                             \
    3944   diagnostic(bool, PrintDTraceDOF, false,                                   \
    3945           "Print the DTrace DOF passed to the system for JSDT probes")      \
    3946                                                                             \
    3947   product(uintx, StringTableSize, defaultStringTableSize,                   \
    3948           "Number of buckets in the interned String table")                 \
    3949                                                                             \
    3950   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
    3951           "Number of buckets in the JVM internal Symbol table")             \
    3952                                                                             \
    3953   product(bool, UseStringDeduplication, false,                              \
    3954           "Use string deduplication")                                       \
    3955                                                                             \
    3956   product(bool, PrintStringDeduplicationStatistics, false,                  \
    3957           "Print string deduplication statistics")                          \
    3958                                                                             \
    3959   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
    3960           "A string must reach this age (or be promoted to an old region) " \
    3961           "to be considered for deduplication")                             \
    3962                                                                             \
    3963   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
    3964           "Force table resize every time the table is scanned")             \
    3965                                                                             \
    3966   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
    3967           "Force table rehash every time the table is scanned")             \
    3968                                                                             \
    3969   develop(bool, TraceDefaultMethods, false,                                 \
    3970           "Trace the default method processing steps")                      \
    3971                                                                             \
    3972   develop(bool, VerifyGenericSignatures, false,                             \
    3973           "Abort VM on erroneous or inconsistent generic signatures")       \
    3974                                                                             \
    3975   product(bool, UseVMInterruptibleIO, false,                                \
    3976           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
    3977           "EINTR for I/O operations results in OS_INTRPT. The default "     \
    3978           "value of this flag is true for JDK 6 and earlier")               \
    3979                                                                             \
    3980   diagnostic(bool, WhiteBoxAPI, false,                                      \
    3981           "Enable internal testing APIs")                                   \
    3982                                                                             \
    3983   product(bool, PrintGCCause, true,                                         \
    3984           "Include GC cause in GC logging")                                 \
    3985                                                                             \
    3986   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
    3987            "Default survivor space alignment in bytes")                     \
    3988                                                                             \
    3989   product(bool , AllowNonVirtualCalls, false,                               \
    3990           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
    3991                                                                             \
    3992   product(ccstr, DumpLoadedClassList, NULL,                                 \
    3993           "Dump the names all loaded classes, that could be stored into "   \
    3994           "the CDS archive, in the specified file")                         \
    3995                                                                             \
    3996   product(ccstr, SharedClassListFile, NULL,                                 \
    3997           "Override the default CDS class list")                            \
    3998                                                                             \
    3999   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
    4000           "Override the default location of the CDS archive file")          \
    4001                                                                             \
    4002   product(ccstr, ExtraSharedClassListFile, NULL,                            \
    4003           "Extra classlist for building the CDS archive file")              \
    4004                                                                             \
    4005   experimental(uintx, ArrayAllocatorMallocLimit,                            \
    4006           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
    4007           "Allocation less than this value will be allocated "              \
    4008           "using malloc. Larger allocations will use mmap.")                \
    4009                                                                             \
    4010   product(bool, EnableTracing, false,                                       \
    4011           "Enable event-based tracing")                                     \
    4012                                                                             \
    4013   product(bool, UseLockedTracing, false,                                    \
    4014           "Use locked-tracing when doing event-based tracing")
    4015
    4016 /*
    4017  *  Macros for factoring of globals
    4018  */
    4019
    4020 // Interface macros
    4021 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
    4022 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
    4023 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
    4024 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
    4025 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
    4026 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
    4027 #ifdef PRODUCT
    4028 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
    4029 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
    4030 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
    4031 #else
    4032 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
    4033 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
    4034 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
    4035 #endif
    4036 // Special LP64 flags, product only needed for now.
    4037 #ifdef _LP64
    4038 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
    4039 #else
    4040 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
    4041 #endif // _LP64
    4042
    4043 // Implementation macros
    4044 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
    4045 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
    4046 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
    4047 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
    4048 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
    4049 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
    4050 #ifdef PRODUCT
    4051 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
    4052 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
    4053 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
    4054 #else
    4055 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
    4056 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
    4057 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
    4058 #endif
    4059 #ifdef _LP64
    4060 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
    4061 #else
    4062 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
    4063 #endif // _LP64
    4064
    4065 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
    4066
    4067 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
    4068
    4069 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
    4070
    4071 // Extensions
    4072
    4073 #include "runtime/globals_ext.hpp"
    4074
    4075 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
    --- EOF ---