RFR: 8271722: [TESTBUG] gc/g1/TestMixedGCLiveThreshold.java can fail if G1 Full GC uses >1 workers [v3]

[Richard Reingruber]

On Wed, 4 Aug 2021 07:51:07 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>> I tried to make this pr is dependent on #4968. Hope this works...
>> 
>> The change fixes a test issue in gc/g1/TestMixedGCLiveThreshold.java by adding
>> the option `-XX:ParallelGCThreads=1`. This prevents the full gc from running
>> with more than one worker because if it would do that, live data could be
>> distributed into several regions and one of them could be selected for
>> collection which is unexpected with `-XX:G1MixedGCLiveThresholdPercent=25`.
>> 
>> Please refer to the JBS-Item for more details.
>> 
>> Thanks, Richard.
>
> Richard Reingruber 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 three additional commits since the last revision:
> 
>  - Merge branch 'master'
>  - 8271722: [TESTBUG] gc/g1/TestMixedGCLiveThreshold.java can fail if G1 Full GC uses >1 workers
>  - start

Thanks for the reviews Albert and Thomas!

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PR: https://git.openjdk.java.net/jdk/pull/4971