RFR: 8252842: Extend jmap to support parallel heap dump [v20]

[Chris Plummer]

On Wed, 14 Apr 2021 12:35:27 GMT, Lin Zang <lzang at openjdk.org> wrote:

>> 8252842: Extend jmap to support parallel heap dump
>
> Lin Zang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 25 commits:
> 
>  - Merge branch 'master' into par-dump
>  - Merge branch 'master' into par-dump
>  - Typo fix
>  - remove parallel option and dumpheapext command
>  - Revert "hide the dumpheapext error message"
>    
>    This reverts commit 1af0e1e2bfab4f5d079c03ff0cb25067acacdac4.
>  - resize large object threshold
>  - Merge branch 'master' into par-dump
>  - Merge branch 'master' into par-dump
>  - code clean
>  - fix trailing white space issue
>  - ... and 15 more: https://git.openjdk.java.net/jdk/compare/e2106d5a...997784b1

> Hi Chris,
> I am going to close the CSR https://bugs.openjdk.java.net/browse/JDK-8260424.
> But it seems this PR also revised the `parallel` option's help message for `jmap -histo`, Do you think it is ok to keep the change in the PR?
> 
> FYI, here is the commits [6789ba2](https://github.com/openjdk/jdk/commit/6789ba291a97a01fdc70258fb25dbf0d6464dba8)
> 
> Thanks,
> Lin

I think it would be best to create a separate PR for that change. No CSR is needed for it.

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PR: https://git.openjdk.java.net/jdk/pull/2261