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  1. JDK
  2. JDK-8315880

Change LockingMode default from LM_LEGACY to LM_LIGHTWEIGHT

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    • b16
    • generic
    • generic
    • Fix failed

    Description

      The LockingMode flag from JDK-8291555 was implemented as an
      experimental flag. We made it a regular product flag in JDK22 in
      preparation for project Lilliput (See JDK-8315061).

      In the next release, we plan to change the default of the LockingMode
      flag from LM_LEGACY to LM_LIGHTWEIGHT. Project Lilliput needs
      the LockingMode flag to be LM_LIGHTWEIGHT. In a release sometime
      after the next release, we place to remove support for LM_LEGACY.

      Insert additional justification for Lilliput here.

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          csr for

          CSR - null JDK-8315881 Change LockingMode default from LM_LEGACY to LM_LIGHTWEIGHT

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

          Enhancement - null JDK-8319251 [REDO] Change LockingMode default from LM_LEGACY to LM_LIGHTWEIGHT

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

          Sub-task - The sub-task of the issue JDK-8319253 [BACKOUT] Change LockingMode default from LM_LEGACY to LM_LIGHTWEIGHT

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8316397 StackTrace/Suspended/GetStackTraceSuspendedStressTest.java failed with "SingleStep event is NOT expected"

          • 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-8316401 sun/tools/jhsdb/JStackStressTest.java failed with "InternalError: We should have found a thread that owns the anonymous lock"

          • 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-8324114 [lworld] GTestWrapper.java fails with "assert(LockingMode == LM_LEGACY) failed: should only be called with legacy stack 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-8315884 New Object to ObjectMonitor mapping

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

          Enhancement - null JDK-8331073 Deprecate LockingMode=LM_LEGACY

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

          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

          Enhancement - null JDK-8291555 Implement alternative fast-locking scheme

          • 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-8316735 Print LockStack in hs_err files

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

          Commit Commit openjdk/jdk/455cfae1

          Review Review openjdk/jdk/15797

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              dcubed Daniel Daugherty
              dcubed Daniel Daugherty
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              Dates

                Created:
                Updated:
                Resolved: