[jdk17u-dev] RFR: 8307348: Parallelize heap walk for ObjectCount(AfterGC) JFR event collection [v2]
Goetz Lindenmaier
goetz at openjdk.org
Thu Jul 6 06:25:10 UTC 2023
On Wed, 5 Jul 2023 09:17:14 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:
>> Improves ObjectCount JFR events that take considerable time at GC pause. While the event is still heavy, the parallelization helps to avoid unnecessarily large stalls.
>>
>> The backport is not clean, because there are number of contextual differences: `WorkGang`, `WithUpdatedActiveWorkers` and other renames did not happen yet. I had to massage the patch to fit 17u better.
>>
>> Additional testing:
>> - [x] Linux x86_64 fastdebug `jdk/jfr serviceability/sa`
>> - [x] Linux x86_64 fastdebug `tier1 tier2 tier3`
>> - [x] Linux AArch64 fastdebug `tier1 tier2 tier3`
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains one additional commit since the last revision:
>
> Backport 540c706bbcbb809ae1304aac4f2a16a5e83cb458
Passes SAP nighlty testing.
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PR Comment: https://git.openjdk.org/jdk17u-dev/pull/1441#issuecomment-1623061080
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