RFR: 8337217: Port VirtualMemoryTracker to use VMATree

[Afshin Zafari]

On Mon, 14 Oct 2024 12:37:05 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Yes, but this code is incorrect. So we should have a test detecting this, but we do not, and so this is under-tested.

This code finds committed regions within a Stack region if they are not accounted by NMT so far, IIUC.
By running this incorrect code, we may get some extra committed size in NMT reports. This is hard in NMT tests to catch. How can we expect a NMT test to measure X bytes of committed stack and not Y bytes? We need to know exactly the X and/or Y to test this code.

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PR Comment: https://git.openjdk.org/jdk/pull/20425#issuecomment-2411263187