RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v61]

[Johannes Bechberger]

On Thu, 5 Jun 2025 01:09:01 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Renaming
>
> src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp line 88:
> 
>> 86:       return false;
>> 87:     }
>> 88:   } while (Atomic::cmpxchg(&_head, elementIndex, elementIndex + 1) != elementIndex);
> 
> Why do we need atomic operations if we hold the enqueue lock. ??

Valid Point, I was probably over cautious.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2127957148