RFR: 8352738: Implement JEP 520: JFR Method Timing and Tracing

[Markus Grönlund]

On Fri, 23 May 2025 15:24:48 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Why release_store_fence() over release_store() in this context?
>
> `release_store_fence` would get stronger seqcst mode, instead of more relaxed acquire/release with just `release_store`. My rule of thumb is to default to a strongest mode, unless we can prove weaker mode is sufficient. Acquire/release is okay for simple uni-directional pub/sub transfer, which this one _looks_ to be, but I am not 100% sure.

A good rule of thumb.

In this case, it is an unidirectional pub/sub transfer, so release_store() will be good enough.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25306#discussion_r2105095604