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

[Johannes Bechberger]

On Sun, 25 May 2025 20:30:50 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/support/jfrThreadLocal.hpp line 378:
> 
>> 376: 
>> 377:   void unset_cpu_timer() {
>> 378:     _has_cpu_timer = false;
> 
> Do we really need a separate bool to understand whether the thread has a timer? Can't that information be deduced from the timer_t?

Do we want to make hard assumptions on timer_t?

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2106303634