RFR: 8291753: Add JFR event for GC CPU Time

[Sangheon Kim]

On Fri, 12 Aug 2022 12:18:10 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> Do you see any issues adding the event for those GCs (as a separate enhancement)? There are no limitation in the information the OS can provide (per thread) or how the GCs are implemented. The reason I am asking is because we want the design of the event to be future proof, so we don't end up with multiple GC CPU events. Users are likely to complain if the event is missing for some GCs. It seems like a very useful event, so I think the demand will be high for other GCs as well. Could you write in the event description which GCs that are supported?

I don't see any issues for other GCs. The only reason is that other GCs don't use the class.
And I agree with you, so I filed "JDK-8292373 Add JFR event for GC CPU Time (other GCs)" for future enhancement. Updated the description as well.

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PR: https://git.openjdk.org/jdk/pull/9760