Details
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Enhancement
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Status: Resolved
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P4
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Resolution: Fixed
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17, 18
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b26
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aarch64
Backports
Issue | Fix Version | Assignee | Priority | Status | Resolution | Resolved In Build |
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JDK-8294123 | 17.0.6-oracle | Tobias Hartmann | P4 | Resolved | Fixed | b01 |
JDK-8293750 | 17.0.6 | Dmitry Chuyko | P4 | Resolved | Fixed | b01 |
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.
Attachments
Issue Links
- backported by
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JDK-8293750 C2 fast_unlock intrinsic on AArch64 has unnecessary ownership check
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- Resolved
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JDK-8294123 C2 fast_unlock intrinsic on AArch64 has unnecessary ownership check
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- Resolved
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- relates to
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JDK-8277877 C2 fast_unlock intrinsic on riscv has unnecessary ownership check
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- Resolved
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- links to
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Commit openjdk/jdk17u-dev/b196bc4c
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Commit openjdk/jdk/3d810ad6
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Review openjdk/jdk17u-dev/660
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Review openjdk/jdk/6498
(2 links to)