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

[Christoph Langer]

On Thu, 3 Nov 2022 18:06:53 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> > Having a couple of additional interesting (and not too complex !) events in the latest LTS is not a bad thing but this is my personal impression. On the other hand I do not care that much, if it is rejected than probably all additional events would be rejected because the others I looked at that were interesting were more complex.
> 
> I think the bar should be high and there should be a good reason, for example to support new hardware or OS versions. Improve security. Things that are essential to be able to use the existing JDK release. I don't see this JFR event fall into that category.

I know there have been discussions about backporting JFR events earlier on and I think none have ever happened. But I think we should constantly reconsider our decisions. Regarding JFR event backports, we have been very conservative overall and I think that is not bad. We need to be careful regarding stability and not to break things. Also, major feature improvements need to come with newer JDK releases. However, we still need and want to support our customers that are running on LTS releases of the OpenJDK. And that's what additional/improved JFR events will help to achieve. So, while we should err on the path of caution as to not break anything, I think we should not reject JFR enhancements per se. At least that's my current thinking...

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