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

[Markus Grönlund]

On Sun, 25 May 2025 15:29:38 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/recorder/service/jfrEventThrottler.cpp line 118:
> 
>> 116: bool JfrEventThrottler::accept(JfrEventId event_id, int64_t timestamp /* 0 */) {
>> 117:   JfrEventThrottler* const throttler = for_event(event_id);
>> 118:   if (throttler == nullptr) {
> 
> Unfortunately, two checks have been introduced on the throttler hot path. Can we avoid this in some way?

Can the settings system be updated so the throttle bit is not set in the native settings struct?

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2106235088