RFR: 8352251: Implement Cooperative JFR Sampling [v15]

[Markus Grönlund]

On Mon, 5 May 2025 08:09:10 GMT, Johannes Bechberger <jbechberger at openjdk.org> wrote:

> Is there the possibility of adding a `bias` flag to the ExecutionSample events to record when an event has a clear safepoint bias? This could mark all samples where the sampler falls back on the safepoint frame.

The next phase, called "Sampling Accuracy," will address how to monitor and improve on safepoint biases and failures. It might involve separate events for failure reason tracking, so I prefer to delay the decision until then.

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PR Comment: https://git.openjdk.org/jdk/pull/24296#issuecomment-2851136287