RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v25]

[Johannes Bechberger]

On Sat, 31 May 2025 10:37:29 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove debug printf
>
> src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.hpp line 139:
> 
>> 137: 
>> 138:   // Trigger sampling while a thread is not in a safepoint, from a seperate thread
>> 139:   static void trigger_is_thread_in_native_stackwalking();
> 
> Is it sampling that is triggered? Sampling refers to the asynchronous signal received from the operating system (OS).
> 
> You are asking for the sampler thread to process already taken JFR Sample Requests in the queue, right?

Yes and I like your implied name better.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2118819169