RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v10]

[Erik Gahlin]

On Mon, 26 May 2025 12:29:13 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:
> 
>   Don't mention throttling

Having four views for the CPU-Time events seems excessive, especially since it's an experimental event. Is it possible to reduce this to two views: the hot-methods table and a "form" view where all the aggregates are displayed?

Labels should use headline-style capitalization, capitalize the first and last words, and all nouns, pronouns, adjectives, verbs and adverbs. Do not include ending punctuation.
https://docs.oracle.com/en/java/javase/24/docs/api/jdk.jfr/jdk/jfr/Label.html

Also, put (Experimental) at the end of the title.

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PR Comment: https://git.openjdk.org/jdk/pull/25302#issuecomment-2909886888