RFR: 8342818: Implement CPU Time Profiling for JFR

[Andrei Pangin]

On Wed, 28 Aug 2024 16:47:21 GMT, Johannes Bechberger <jbechberger 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.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r1783615298