RFR: JDK-8289524: Add JFR JIT restart event

[Matthias Baesken]

On Thu, 30 Jun 2022 13:17:09 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The JIT compiler restarts (see restart_compiler in NMethodSweeper::sweep_code_cache) would be a helpful addition to the JFR events. Currently we log the JIT stop operations in JFR (EventCodeCacheFull) but no restart.

Hi Markus, another question that came up while looking into this - the current SweepCodeCache event has a threshold of 100 ms set in both default.jfc and profile.jfc .  This was probably fine for existing usages.  But would we loose the JIT restart events sometimes in case we incorporate the Jit restart and frred memory into the current SweepCodeCache   event ?

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PR: https://git.openjdk.org/jdk/pull/9334