RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v29]

[Markus Grönlund]

On Mon, 2 Jun 2025 13:50:49 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:
> 
>   Fix bug related to async stack walking

src/hotspot/share/memory/resourceArea.hpp line 46:

> 44: // A ResourceArea is an Arena that supports safe usage of ResourceMark.
> 45: class ResourceArea: public Arena {
> 46: 

Changes in this file are unrelated, so revert this entire file.

src/hotspot/share/prims/forte.cpp line 575:

> 573: extern "C" {
> 574: JNIEXPORT
> 575: void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext) {

Unrelated changes, please revert file.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2121757461
PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2121757998