RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v55]

[Johannes Bechberger]

On Wed, 4 Jun 2025 17:24:07 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Please file the follow-ups to figure out the memory ordering story in `JfrCPUTimeTraceQueue`.

I created a preliminary issue at https://bugs.openjdk.org/browse/JDK-8358616

> src/hotspot/share/runtime/vmOperation.hpp line 119:
> 
>> 117:   template(RendezvousGCThreads)                   \
>> 118:   template(CPUTimeSamplerThreadInitializer)       \
>> 119:   template(CPUTimeSamplerThreadTerminator)        \
> 
> I think these better be prefixed with `JFR`. E.g.: `JFRInitializeCPUTimeSampler` / `JFRTerminateCPUTimeSampler`?

Good point

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PR Comment: https://git.openjdk.org/jdk/pull/25302#issuecomment-2940863550
PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2127113247