RFR: 8351661: NMT: VMATree should support separate call-stacks for reserve and commit operations [v2]

[Afshin Zafari]

On Fri, 14 Mar 2025 16:04:04 GMT, Gerard Ziemski <gziemski at openjdk.org> wrote:

>> One StackIndex is used for all reserve/commit/uncommit/release operations.
>> We need another one just used for committing and uncommitting the start-node of the reserved region.
>> So names like ReserveXXX and CommitXXX would not fit. 
>> I do not insist on the chosen names and am open to proper alternatives.
>
> In your gtest you have a test called "SeparateStacksForCommitAndReserve", which seems to say to me, that commit and reserve would be good names?

The full name should be something like:
commit_stack_at_start_of_region
or
stack_for_commit_at_region_base
Although it is also used for uncommit but we don't show uncommit stack traces in NMT report. 
What do you think? Any other better naming?

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PR Review Comment: https://git.openjdk.org/jdk/pull/24028#discussion_r1998362656