RFR: 8337217: Port VirtualMemoryTracker to use VMATree [v31]

[Gerard Ziemski]

On Tue, 25 Feb 2025 11:06:26 GMT, Afshin Zafari <azafari at openjdk.org> wrote:

>> - `VMATree` is used instead of `SortedLinkList` in new class `VirtualMemoryTracker`.
>>  -  A wrapper/helper `RegionTree` is made around VMATree to make some calls easier.
>>  - `find_reserved_region()` is used in 4 cases, it will be removed in further PRs.
>>  - All tier1 tests pass except this https://bugs.openjdk.org/browse/JDK-8335167.
>
> Afshin Zafari has updated the pull request incrementally with one additional commit since the last revision:
> 
>   reviews applied.

How would I go about verifying the performance gain? You mentioned previously that you wrote a microbenchmark for testing this?

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PR Comment: https://git.openjdk.org/jdk/pull/20425#issuecomment-2682420600