RFR: 8364090: Dump JFR recording on CrashOnOutOfMemoryError

[Yasumasa Suenaga]

On Fri, 25 Jul 2025 08:21:52 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> Could you call the parameter something more fitting? Perhaps emit_old_object_samples, if that is the new purpose of the flag?

Ok, I will rename to `emit_old_object_samples`.

> I think the OldObjectSample event should only be emitted directly from native, if an emergency dump occurs , preferably only on oom. Normal exit should be handled from Java, where a user can configure the event settings.

Normally, JFR recording should already be stopped at this point because it is stopped by shutdown hook. So I guess this code (`Jfr::on_vm_shutdown` call at here) rarely works. However it might work if shutdown hook would not work for some reasons - OOM for example.

So should we keep this code?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26468#discussion_r2230583197