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  1. JDK
  2. JDK-8291555

Implement alternative fast-locking scheme

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 21
    • 20
    • hotspot
    • b22
    • generic
    • generic

    Description

      Current stack-locking overloads object headers with pointers into the stack. This makes it difficult to get hold of the actual mark word, because locking can change the header at any time.

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        Issue Links

          blocks

          Enhancement - null JDK-8305895 Implementation: JEP 450: Compact Object Headers (Experimental)

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8307493 Use thread register C2MacroAssembler::fast_lock()

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open
          csr for

          CSR - null JDK-8305999 Add experimental -XX:LockingMode flag

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8307810 Consistently use LockingMode instead of UseHeavyMonitors

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8307532 Implement LM_LIGHTWEIGHT for Zero

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8310023 [lworld] Implement alternative fast-locking scheme in Valhalla

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8320167 aarch64: lightweight locking could possibly use fewer memory barriers

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Enhancement - null JDK-8295849 Consolidate Threads::owning_thread*

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8300440 [Lilliput] Implement alternative fast-locking scheme

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8307758 RISC-V: Improve bit test code introduced by JDK-8291555

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8315061 Make LockingMode a product flag

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8318015 Lock inflation not needed for OSR or Deopt for new locking modes

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8315880 Change LockingMode default from LM_LEGACY to LM_LIGHTWEIGHT

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. JDK-8311993 Test serviceability/sa/UniqueVtableTest.java failed: duplicate vtables detected

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. JDK-8316880 AArch64: "stop: Header is not fast-locked" with -XX:-UseLSE since JDK-8315880

          • P2 - Crashes, loss of data, severe memory leak.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8317262 LockStack::contains(oop) fails "assert(t->is_Java_thread()) failed: incorrect cast to JavaThread"

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8318895 Deoptimization results in incorrect lightweight locking stack

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8323781 [lworld] Synchronization on inline type does not throw IllegalMonitorStateException with lightweight locking

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8316746 Top of lock-stack does not match the unlocked object

          • P2 - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. JDK-8316751 IllegalMonitorStateException: current thread is not owner

          • P3 - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. JDK-8316921 Perf regressions up to 14% in b16 many benchmarks all platforms

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Enhancement - null JDK-8308469 [PPC64] Implement alternative fast-locking scheme

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8308479 [s390x] Implement alternative fast-locking scheme

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8316735 Print LockStack in hs_err files

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8317452 [JVMCI] Export symbols used by lightweight locking to JVMCI compilers.

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          links to

          Commit Commit openjdk/jdk/7f6358a8

          Review Review openjdk/jdk/9680

          Review Review openjdk/jdk/10590

          Review Review openjdk/jdk/10907

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              rkennke Roman Kennke
              rkennke Roman Kennke
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              Dates

                Created:
                Updated:
                Resolved: