RFR: 8360046: Scalability issue when submitting virtual threads with almost empty tasks [v22]

[Viktor Klang]

On Wed, 26 Nov 2025 15:35:13 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:
> 
>   For testing

src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java line 1435:

> 1433:          */
> 1434:         final void topLevelExec(ForkJoinTask<?> task, int cfg) {
> 1435:             int fifo = cfg & FIFO, clr = cfg & CLEAR_TLS;

@DougLea `clr` isn't used (so there's no clearing of TLs)

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PR Review Comment: https://git.openjdk.org/jdk/pull/26479#discussion_r2569349951