RFR: 8360046: Scalability issue when submitting virtual threads with almost empty tasks [v10]

[Viktor Klang]

On Sat, 20 Sep 2025 17:32:31 GMT, Doug Lea <dl at openjdk.org> wrote:

>> This set of updates reduces contention-based performance loss under heavy over-subscription, while also improving perfomance more generally.
>
> Doug Lea has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add @Contended WorkQueue region. Adapt accordingly.

src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 1320:

> 1318:                 (t = (ForkJoinTask<?>)U.getAndSetReference(a, k, null)) != null)
> 1319:                 updateTop(s);
> 1320:             return t;

Nice!

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PR Review Comment: https://git.openjdk.org/jdk/pull/26479#discussion_r2367464512