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

[Serguei Spitsyn]

On Sun, 7 Feb 2021 12:38:55 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> parallel -histo of jmap was added by JDK-8214535, it's better to support parallel for jcmd GC.class_histogram too.
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   improve jcmd GC.class_histogram to support parallel

Hi @Hamlin-Li,

It looks good in general.
A question: What is going to happen if the number of parallel threads passed to the command is too big? Is there any limit, and what has to be the expected behavior in such a case? I'll look at the CSR.
Thanks,
Serguei

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