RFR: 8157023: Integrate NMT with JFR [v2]

[Stefan Johansson]

On Fri, 2 Dec 2022 16:34:41 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> I did some tests and on my box probing 20k threads - if we get ThreadCritical right away - takes about 50-100ms.

Ok, so the summary is stalled that long because somebody is already in a `ThreadCritical` (like registering a new thread stack) or do you mean that the actual baseline (stack-walk) takes that long, so we potentially stall other caller of `ThreadCritical`?

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