On Tue, 13 Jan 2026 09:22:14 GMT, Alan Bateman <[email protected]> wrote:
> This PR is for the jdk26 branch, not main line. > > The changes in [JDK-8360046](https://bugs.openjdk.org/browse/JDK-8360046) > improve the scalability of virtual threads but introduce a subtle issue with > signal filtering and a regression in some SPECjbb2015 runs. > [pull/28797](https://git.openjdk.org/jdk/pull/28797) is in progress for main > line to address these issues. > > For the jdk26 branch, the proposal is to backout the changes to ForkJoinPool > from JDK-8360046 but leave the small change to setParallelism to trigger > worker activation and the small change to VirtualThread to > submit(ForkJoinTask) consistently. As part of the change, the acquire fence > change to address [JDK-8372835](https://bugs.openjdk.org/browse/JDK-8372835) > are proposed to be included, to avoid bringing back an issue that was fixed > by JDK-8360046. So a somewhat complicated story due to jdk26 being in RDP1. > > > Testing: test1-5, repeat testing of java/util/concurrent and > java/lang/Thread/virtual tests. This pull request has now been integrated. Changeset: 283da4dd Author: Alan Bateman <[email protected]> URL: https://git.openjdk.org/jdk/commit/283da4ddcbd7e0f46d996c698c9c7195c6545197 Stats: 467 lines in 2 files changed: 143 ins; 140 del; 184 mod 8375130: [BACKOUT] Scalability issue when submitting virtual threads with almost empty tasks Reviewed-by: vklang ------------- PR: https://git.openjdk.org/jdk/pull/29187
