RFR: 8278475: G1 dirty card refinement by Java threads may get unnecessarily paused

Thu Jan 20 10:41:48 UTC 2022

On Wed, 19 Jan 2022 22:31:19 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to avoid attempts to refine dirty cards by Java
> threads when there is an active STS yield request, as the attempt will just
> end up being paused.  When going into a safepoint this avoids wasted work and
> transfer of buffers into the paused list.  More importantly, when coming out
> of a pause this avoids deferring buffers to after the next safepoint, due to
> the yield request being cleared after Java threads are restarted.
> 
> Testing:
> mach5 tier1
> 
> Lots of testing as part of investigation of JDK-8273383.

Lgtm.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7148