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

[Johannes Bechberger]

On Sun, 1 Jun 2025 13:41:44 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp line 558:
>> 
>>> 556:       jt->is_JfrRecorder_thread()) {
>>> 557:       queue.increment_lost_samples();
>>> 558:       tl->set_do_async_processing_of_cpu_time_jfr_requests(false);
>> 
>> Why is this restored here?
>
> Because I shouldn't sample if the thread isn't in native state anymore. The thread is probably sampled anyway on the outgoing safepoint.

But you might be right, I removed it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2120481274