RFR: JDK-8318636: Add jcmd to print annotated process memory map [v6]

[Thomas Stuefe]

On Wed, 1 Nov 2023 10:01:43 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix various builds
>
> src/hotspot/share/nmt/memMapPrinter.cpp line 105:
> 
>> 103:       _ranges[_count - 1].to = to;
>> 104:       return true;
>> 105:     }
> 
> I'm pretty sure that the virtual memory tracker already gives you the minimal set of regions, have you observed this branch being taken?

Yes, it resulted in a significant performance gain for a test run where I interleaved non-committed and committed memory of the same tag. I may have been mistaken, of course.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16301#discussion_r1378613209