RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v26]

[Markus Grönlund]

On Sun, 1 Jun 2025 15:24:17 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Johannes Bechberger has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Refactoring
>>  - Remove convoluted native trace logic
>
> src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp line 344:
> 
>> 342: 
>> 343: // equals operator for JfrSampleRequest
>> 344: inline bool operator==(const JfrSampleRequest& lhs, const JfrSampleRequest& rhs) {
> 
> Can be removed.

Unless you still want to try the ljf JfrSampleRequest optimization for the native ljf, which I kind of like now that I understand it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2119386104