[jdk17u-dev] RFR: 8289524: Add JFR JIT restart event

[Matthias Baesken]

On Thu, 3 Nov 2022 20:00:45 GMT, Christoph Langer <clanger at openjdk.org> wrote:

> I know there have been discussions about backporting JFR events earlier on and I think none have ever happened. 

We had a few backports to 11  ([8003209](https://bugs.openjdk.org/browse/JDK-8003209) even backported to 8) in the past

https://bugs.openjdk.org/browse/JDK-8213617
(11.0.4)

https://bugs.openjdk.org/browse/JDK-8223438
(11.0.6)

https://bugs.openjdk.org/browse/JDK-8003209
(11.0.1)

The last one looks like a rather complex event, as far as I can see ...
Two of my examples added events, one just a field to an existing event. Not aware of any tools crashing/stopped working because of those additions (but to be fair, I do not monitor all tools that deal with JFR events).
See also 
https://github.com/openjdk/jdk11u-dev/commits/master/src/hotspot/share/jfr/metadata/metadata.xml
to get more info about the topic.

Maybe regarding this event, as a compromise we could wait until jdk20 is released (includes JDK-8289524) and then some time;  and then do the backport.

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PR: https://git.openjdk.org/jdk17u-dev/pull/853