RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v17]

[Johannes Bechberger]

On Tue, 27 May 2025 11:11:13 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove assertion
>
> src/hotspot/share/jfr/periodic/sampling/jfrSampleRequest.cpp line 174:
> 
>> 172:   assert(request._sample_pc != nullptr, "invariant");
>> 173:   assert(jt != nullptr, "invariant");
>> 174:   assert(jt->thread_state() == _thread_in_Java, "invariant");
> 
> What?

I also call this method for native stack traces in my implementation. As I have to walk native stack traces at stackwalks.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2108995311