Integrated: 8367378: GenShen: Missing timing stats when old mark buffers are flushed during final update refs

[William Kemper]

On Thu, 11 Sep 2025 20:28:08 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This change adds timing to the 'flush old SATB buffers' subphase of final update refs. Ultimately, we hope to move this phase to a handshake (or not have it all). In the interim, we should at least know how long it takes. The updated phase timings message in the logs has the form:
> 
> [2025-09-11T18:43:11.463+0000][291.626s][3541][info ][gc,stats       ] Pause Final Update Refs (N)         377 us, workers (us): ---, ---, ---, ---, ---, ---, ---, ---, 
> [2025-09-11T18:43:11.463+0000][291.626s][3541][info ][gc,stats       ]   Update Region States               98 us
> [2025-09-11T18:43:11.463+0000][291.626s][3541][info ][gc,stats       ]   Transfer Old From SATB             74 us
> [2025-09-11T18:43:11.463+0000][291.626s][3541][info ][gc,stats       ]   Trash Collection Set               48 us
> [2025-09-11T18:43:11.463+0000][291.626s][3541][info ][gc,stats       ]   Rebuild Free Set                  132 us
> [2025-09-11T18:43:11.463+0000][291.626s][3541][info ][gc,stats       ]   Propagate GC State                  6 us
> 
> The `Transfer Old From SATB` is new.

This pull request has now been integrated.

Changeset: 11df2891
Author:    William Kemper <wkemper at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/11df28916af4c2bfd69b2829c74e046ad953ee6c
Stats:     2 lines in 2 files changed: 2 ins; 0 del; 0 mod

8367378: GenShen: Missing timing stats when old mark buffers are flushed during final update refs

Reviewed-by: kdnilsen, xpeng, phh

-------------

PR: https://git.openjdk.org/jdk/pull/27234