RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v5]

[Johannes Bechberger]

On Mon, 26 May 2025 09:07:12 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> That's fine. Its the term "out of safepoint" which is a concept that does not refer to anything concrete.
>> 
>> "Sampling" is the process of saving and enqueing a JfrSampleRequest.
>> 
>> "Stackwalking" or "processing of enqueued requests" is another thing. Are you referring to the second here?
>> 
>> "out of safepoint" does not make any sense.
>
> Walking from an ljf is walking at a safepoint by design. Its just that in this case, you delegate to another thread to do it.

I improved the names (changed it to `thread_in_native_stackwalking`)

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2106909231