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

[Johannes Bechberger]

On Sun, 25 May 2025 10:14:14 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix compilation
>
> src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp line 25:
> 
>> 23:  */
>> 24: 
>> 25: #include "gc/shared/barrierSet.hpp"
> 
> Is this used / needed?

Good catch

> src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp line 219:
> 
>> 217:   void stop_timer();
>> 218: 
>> 219:   void trigger_out_of_safepoint_sampling();
> 
> What is "out of safepoint sampling"?

See above

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2106811373
PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2106805944