RFR: JDK-8261034: improve jcmd GC.class_histogram to support parallel [v7]

[Hamlin Li]

On Mon, 8 Feb 2021 02:35:17 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   improve jcmd GC.class_histogram to support parallel
>
> Marked as reviewed by cjplummer (Reviewer).

Hi Chris, Would you mind also help to review the related CSR https://bugs.openjdk.java.net/browse/JDK-8261105? Thanks

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PR: https://git.openjdk.java.net/jdk/pull/2379