On Wed, 10 Jun 2026 17:35:43 GMT, Mat Carter <[email protected]> wrote:
> With -UseLSE the Starvation test on Windows ARM64 timeouts close to 100% > whereas this only happens on Linux ARM64 on larger machines with many cores. > The issue is that C2 outputs an LDR following the CAS in LinkedTransferQueue > which can execute before the STLXR breaking the Dekker protocol. > > Replacing the LDR with LADR by using getAcquire solves the issue as it won't > be reordered before the STLXR. This does impact the +UseLSE case as the LADR > was not necessary and is slightly more expensive than LDR. But to handle > this case would require larger changes to Hotspot > > Starvation test passes on Windows ARM64 and Linux ARM64, with no regressions > on tier1 > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai). This pull request has now been integrated. Changeset: 5bb5a88f Author: Mat Carter <[email protected]> URL: https://git.openjdk.org/jdk/commit/5bb5a88f51ec8ff12493ba511572468b424da932 Stats: 48 lines in 6 files changed: 46 ins; 0 del; 2 mod 8386428: With -UseLSE the Starvation test on Windows ARM64 timeouts Reviewed-by: aph, qamai, vklang, gcao ------------- PR: https://git.openjdk.org/jdk/pull/31465
