RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v46]

[Johannes Bechberger]

On Wed, 4 Jun 2025 11:28:51 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

>> This is the code for the [JEP 509: CPU Time based profiling for JFR](https://openjdk.org/jeps/509).
>> 
>> Currently tested using [this test suite](https://github.com/parttimenerd/basic-profiler-tests). This runs profiles the [Renaissance](https://renaissance.dev/) benchmark with
>> - ... different heap sizes
>> - ... different GCs
>> - ... different samplers (the standard JFR and the new CPU Time Sampler and both)
>> - ... different JFR recording durations
>> - ... different chunk-sizes
>
> Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Improve error message

> [a419dab](https://github.com/openjdk/jdk/commit/a419dabab213e78a2ff7f3c62cd4af72a0fdabed)
> Since the implementation has changed from Loss to Lost, the JEP document needs to be changed back to the original, Lost.

Good catch, I updated the JEP.

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PR Comment: https://git.openjdk.org/jdk/pull/25302#issuecomment-2939723399