RFR: 8336707: Contention of ForkJoinPool grows when stealing works [v30]

[Viktor Klang]

On Tue, 19 Nov 2024 22:51:04 GMT, Doug Lea <dl at openjdk.org> wrote:

>> This addresses tendencies in previous update to increase fencing, scanning, and signalling that can increase contention, and slow down performance especially on ARM platforms. It also uses more ARM-friendly constructions to reduce overhead (leading to several changes that all of the same form),
>
> Doug Lea has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 52 additional commits since the last revision:
> 
>  - Merge branch 'openjdk:master' into JDK-8336707
>  - Add comments
>  - Ensure InnocuousForkJoinWorkerThread usable with or without SecurityManager
>  - Merge branch 'openjdk:master' into JDK-8336707
>  - Merge branch 'openjdk:master' into JDK-8336707
>  - Rename variable
>  - Merge branch 'openjdk:master' into JDK-8336707
>  - Improve readbility; tweak runState checks
>  - Address review comments
>  - Merge remote-tracking branch 'refs/remotes/origin/JDK-8336707' into JDK-8336707
>  - ... and 42 more: https://git.openjdk.org/jdk/compare/544bc3cc...b0fe90e0

Great work, @DougLea!

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Marked as reviewed by vklang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21507#pullrequestreview-2450684522