RFR: 8342818: Implement CPU Time Profiling for JFR [v4]

[Johannes Bechberger]

On Thu, 31 Oct 2024 13:02:06 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

> Are you enqueuing entries that have already been unloaded?

Into the JFR buffers? It is possible that we access the methods of unloaded classes, when they are unloaded between the signal handler enqueue and the capture. I thought that this would crash in the method resolve, which would then be caught via the used ThreadCrashProtection. But apparently not. I'm unsure how to solve this. Maybe I could check whether the methods class is unloaded?

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PR Comment: https://git.openjdk.org/jdk/pull/20752#issuecomment-2449797887