RFR: 8342818: Implement CPU Time Profiling for JFR [v20]

[Erik Gahlin]

On Mon, 11 Nov 2024 13:37:49 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> This is the code for the [JEP draft: CPU Time based profiling for JFR].
>
> Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix ActiveSetting event for CPUTimeSamples

src/jdk.jfr/share/classes/jdk/jfr/internal/util/TimespanRate.java line 50:

> 48:             return new TimespanRate(Runtime.getRuntime().availableProcessors() / (period / 1_000_000_000.0), false);
> 49:         }
> 50:         return new TimespanRate(Rate.of(text).perSecond(), true);

What if the rate contained in text is not valid? Shouldn't it be:

Rate r = Rate.of(text);
return r == null ? null : new TimespanRate(r.perSecond(), true);

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r1836854538