RFR: 8252103: Parallel heap inspection for ParallelScavengeHeap [v9]

[Lin Zang]

On Fri, 30 Oct 2020 19:27:01 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Lin Zang 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 seven additional commits since the last revision:
>> 
>>  - Merge remote-tracking branch 'upstream/master' into jmap-par
>>  - Merge remote-tracking branch 'upstream/master' into jmap-par
>>  - update the return type of iterable_blocks to size_t
>>  - cast iterable_blocks to int in claim_and_get_block()
>>  - fix constant coding style and do code refine
>>  - Refine HeapBlockClaimer implementation
>>  - 8252103: Parallel heap inspection for ParallelScavengeHeap
>>    
>>    - Parallel heap iteration support for PSS
>>    - JBS:  https://bugs.openjdk.java.net/browse/JDK-8252103
>
> Changes requested by tschatzl (Reviewer).

Dear @tschatzl , 
    Thanks for your proposed fix, I also prefer it because it could avoid the conversion between signed and unsigned. I will make a new commit to incorporate it. 

Thanks!
Lin

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PR: https://git.openjdk.java.net/jdk/pull/25