RFR: 8335902: Parallel: Refactor VM_ParallelGCFailedAllocation and VM_ParallelGCSystemGC [v4]

[Albert Mingkun Yang]

On Thu, 11 Jul 2024 18:06:34 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Similar cleanup as https://github.com/openjdk/jdk/pull/19056 but in Parallel. As a result, the corresponding code in `SerialHeap` and `ParallelScavengeHeap` share much similarity.
>> 
>> The easiest way to review is to start from these two VM operations, `VM_ParallelCollectForAllocation` and `VM_ParallelGCCollect` and follow the new code directly, where one can see how allocation-failure triggers various GCs with different collection efforts.
>> 
>> Test: tier1-6; perf-neural for dacapo, specjvm2008, specjbb2015 and cachestresser.
>
> Albert Mingkun Yang 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 five additional commits since the last revision:
> 
>  - Merge branch 'master' into pgc-vm-operation
>  - review
>  - review
>  - Merge branch 'master' into pgc-vm-operation
>  - pgc-vm-operation

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/20077#issuecomment-2225527435