RFR: 8342818: Implement CPU Time Profiling for JFR [v4]

[David Holmes]

On Thu, 31 Oct 2024 06:41:13 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> DST changes are not reflected in the low-level clocks, they come from higher-level API's that format times and account for TZ.
>> 
>> The clock underpinning `javaTimeMillis` can still jump due to NTP adjustments and so a monotonic clock source is preferable.
>
> So this issue is now resolved?

Yes using nanoTime resolves any concerns.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r1825445502