RFR: 8342818: Implement CPU Time Profiling for JFR [v10]

[Markus Grönlund]

On Wed, 6 Nov 2024 10:57:59 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 two additional commits since the last revision:
> 
>  - Only do timer init and removal at global safepoint
>  - Only do timer init and removal at global safepoint

src/hotspot/share/jfr/recorder/storage/jfrMemorySpaceRetrieval.hpp line 88:

> 86:       if (node == nullptr) return nullptr;
> 87:       assert(node->free_size() >= size, "invariant");
> 88:       assert(node->identity() == nullptr, "invariant");

This is not the right way to do it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20752#discussion_r1831561202