RFR: 8297692: Avoid sending per-region GCPhaseParallel JFR events in G1ScanCollectionSetRegionClosure

[Thomas Schatzl]

On Thu, 14 Nov 2024 03:56:05 GMT, Sangheon Kim <sangheki at openjdk.org> wrote:

>> Hi all,
>> 
>>   please review this change that significantly reduces the amount of "Code Roots" and "Optional Roots" JFR events to reduce default recording sizes significantly.
>> 
>> E.g. a 10min BigRamTester run creates a 23MB recording without this change, with like hundreds of thousands of these events (#gcs * #gc threads * #regions in collection set). With this change, the recording is reduced to 4MB (#gcs * #gc threads)
>> 
>> Testing: gha, tier1-3
>> 
>> Thanks,
>>   Thomas
>
> LGTM

Thanks @sangheon @walulyai @albertnetymk for your reviews

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PR Comment: https://git.openjdk.org/jdk/pull/21984#issuecomment-2476365240