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

[Johannes Bechberger]

On Mon, 2 Jun 2025 04:28:02 GMT, David Holmes <dholmes 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 119:
> 
>> 117:   _data = new_data;
>> 118:   _capacity = capacity;
>> 119: }
> 
> I assume there is a lock protecting this so it happens atomically?

This happens before the signal handler is attached to thread. So it does happen before any parallelism is introduced on thread creation.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2120557327