RFR: JDK-8319662 ForkJoinPool trims worker threads too slowly [v3]

[Andrey Turbanov]

On Tue, 21 Nov 2023 17:12:39 GMT, Doug Lea <dl at openjdk.org> wrote:

>> This update cascades timeouts to trim subsequent workers after the first  keepAlive inactive period.
>
> 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 three additional commits since the last revision:
> 
>  - Merge branch 'openjdk:master' into JDK-8319662
>  - tweak cascades; reinstate an @Contended; resolve JDK-8319498
>  - Support cascading idle timeouts

src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 2149:

> 2147:                 deadline - System.currentTimeMillis() < TIMEOUT_SLOP) {
> 2148:                 long sp = w.stackPred & LMASK, c;
> 2149:                 if ((nextPhase & SMASK) == ((int)(c = ctl) & SMASK)  &&

Suggestion:

                if ((nextPhase & SMASK) == ((int)(c = ctl) & SMASK) &&

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PR Review Comment: https://git.openjdk.org/jdk/pull/16725#discussion_r1401649883