JDK-8331714 : Make OopMapCache installation lock-free
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 11,17,21,22,23
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2024-05-06
  • Updated: 2025-01-08
  • Resolved: 2024-05-07
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JDK 21 JDK 22 JDK 23
21.0.5Fixed 22.0.2Fixed 23 b22Fixed
Related Reports
Blocks :  
JDK-8331771 - ZGC: Remove OopMapCacheAlloc_lock ordering workaround
Blocks :  
JDK-8331572 - Allow using OopMapCache outside of STW GC phases
Description
Trying to solve JDK-8331572 runs into all sorts of lock ranking issues with `OopMapCacheAlloc_lock`. I think it would be a bit saner to rewrite the double-checked locking installation to atomic lock-free.
Comments
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/19100 Date: 2024-05-06 10:02:40 +0000
08-01-2025
[jdk21u-fix-request] Approval Request from Aleksey Shipilëv Clean backport to improve internal locking. Also makes future backports clean by avoiding lock ranking problems. The patch was in mainline for 3 weeks without bugtail. The change is simple, and thus the risk is on the lower side.
28-05-2024
[jdk22u-fix-request] Approval Request from Aleksey Shipilëv Clean backport to improve internal locking. Also makes future backports clean by avoiding lock ranking problems. The patch was in mainline for 3 weeks without bugtail. The change is simple, and thus the risk is on the lower side.
28-05-2024
A pull request was submitted for review. URL: https://git.openjdk.org/jdk21u-dev/pull/608 Date: 2024-05-28 08:54:54 +0000
28-05-2024
A pull request was submitted for review. URL: https://git.openjdk.org/jdk22u/pull/225 Date: 2024-05-28 08:42:21 +0000
28-05-2024
Changeset: a2584a83 Author: Aleksey Shipilev <shade@openjdk.org> Date: 2024-05-07 08:30:26 +0000 URL: https://git.openjdk.org/jdk/commit/a2584a8341b2dc9c102abd373a890b2108d3f57e
07-05-2024