RFR: 8359110: Log accumulated GC and process CPU time upon VM exit [v9]
Jonas Norlinder
duke at openjdk.org
Mon Jun 23 13:12:28 UTC 2025
> Add support to log CPU cost for GC during VM exit with `-Xlog:gc`.
>
>
> [1.500s][info ][gc] GC CPU cost: 1.75%
>
>
> Additionally, detailed information may be retrieved with `-Xlog:gc=trace`
>
>
> [1.500s][trace][gc] Process CPU time: 4.945370s
> [1.500s][trace][gc] GC CPU time: 0.086382s
> [1.500s][info ][gc] GC CPU cost: 1.75%
Jonas Norlinder has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 16 commits:
- Remove incorrect is_gc_operation call after rebase
- More clean up, remove virtual
- Fixes after feedback from @stefank
- Remove extra whitespace
- operation_is_gc -> is_gc_operation per @stefank suggestion
- Only sample if needed
- Remove explicit super call and minor fixes
- Add CPU time tracking for string deduplication to log_gc_vtime
- Replace calls to log_gc_vtime with super-class method calls
- Add bug fix after refactor and fixes for review
- ... and 6 more: https://git.openjdk.org/jdk/compare/c748d358...553edc48
-------------
Changes: https://git.openjdk.org/jdk/pull/25779/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25779&range=08
Stats: 233 lines in 15 files changed: 223 ins; 7 del; 3 mod
Patch: https://git.openjdk.org/jdk/pull/25779.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/25779/head:pull/25779
PR: https://git.openjdk.org/jdk/pull/25779
More information about the hotspot-gc-dev
mailing list