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  1. JDK
  2. JDK-8277411

C2 fast_unlock intrinsic on AArch64 has unnecessary ownership check

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 18
    • Fix Version/s: 18
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b26
    • CPU:
      aarch64

      Description

      The AArch64 fast_unlock C2 code checks if the current thread owns the lock. This can be surprisingly expensive in workload where locking is contended. The check is however optional (helpful only for finding JNI code bugs), and indeed not emitted for x86_64. We should consider removing it on AArch64.

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          relates to

          Enhancement - null JDK-8277877 C2 fast_unlock intrinsic on riscv has unnecessary ownership check

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

          Commit Commit openjdk/jdk/3d810ad6

          Review Review openjdk/jdk/6498

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              People

              Assignee:
              eosterlund Erik Österlund
              Reporter:
              eosterlund Erik Österlund
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                Dates

                Created:
                Updated:
                Resolved: