RFR: 8342818: Implement CPU Time Profiling for JFR

[Johannes Bechberger]

On Tue, 1 Oct 2024 22:43:11 GMT, Andrei Pangin <apangin at openjdk.org> wrote:

>> This is the code for the [JEP draft: CPU Time based profiling for JFR].
>
> src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp line 457:
> 
>> 455:   int64_t new_value = 0;
>> 456:   if (throttle < 0) { // off
>> 457:     new_value = period_millis;
> 
> Here `new_value` can be set to `-1` thus causing an invalid interval passed to `timer_settime` later.

Good catch, fixed it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r1784308182