RFR: 8157023: Integrate NMT with JFR [v3]

[Stefan Johansson]

On Tue, 6 Dec 2022 12:53:31 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Stefan Johansson has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Special snapshot for NMT events in JFR
>
> src/hotspot/share/services/memSnapshot.cpp line 99:
> 
>> 97:   if (_snapshot_options.update_thread_stacks) {
>> 98:     walk_thread_stacks();
>> 99:   }
> 
> It does not make sense to walk_thread_stacks independently from the VM snapshot, since it piggy-backs on it. I would move this into the _snapshot_options.include_vm condition.

True and this is why I kind of think malloc and vm should not be optional. But I can move this into the "vm" condition.

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PR: https://git.openjdk.org/jdk/pull/11449