RFR: 8342818: Implement CPU Time Profiling for JFR [v21]

[Jaroslav Bachorik]

On Wed, 13 Nov 2024 09:11:46 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> src/hotspot/share/jfr/recorder/stacktrace/jfrAsyncStackTrace.cpp line 68:
>> 
>>> 66:   _reached_root = true;
>>> 67: 
>>> 68:   JfrVframeStream vfs(jt, frame, false, true, false);
>> 
>> Does this mean we are not going to get frames from virtual threads/continuations?
>
> Only the ones that are currently on the stack, as far as I understand.
> 
> But this change is required, as walking continuations in a signal causes crashes.

Ok. This is benign then. Since the carrier thread is being executed the virtual thread frames (if any is mounted) will be on stack.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r1842644581