RFR: 8252103: Parallel heap inspection for ParallelScavengeHeap [v4]

[Lin Zang]

On Thu, 22 Oct 2020 08:54:58 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Lin Zang has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.
>
> Took a second look today and found two additional problems. 
> 
> I would also be interested in what kind of testing you've done with this patch.

Dear @kstefanj, 
     I have made a new commit that refined the HeapBlockClaimer. Thanks a lot for your review!
     And I have conduced the following tests: (on x86_64 ubuntu system)
     * tier1 test with no regression
     * jmap -histo:parallel=[N]  [pid] with N = 0,1,2,3,4, 10000, with a java thread running with "-XX:+UseParallelGC -XX:ParaelGCThreads=4" options.  All test worked as expected (All test worked normally and "histo" data dumped are same)

Thanks, 
Lin

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