RFR: 8366847: JFR reports incorrect number of cores on hybrid CPU [v2]

[Yasumasa Suenaga]

On Tue, 9 Sep 2025 10:27:22 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> you might want to check the event in JMC just to be sure. 

I checked the flight record, but JMC 9.1 showed raw min_jlong value. I think it is a problem on JMC.

<img width="812" height="340" alt="image" src="https://github.com/user-attachments/assets/1919ac46-77c5-4658-8fa1-8aea7aa6bef2" />


> Problem might be the API, e.g. int cores = event.getInt("cores") or Integer cores = event.getValue("cores").

I hope the problem would be found by jdk_jfr tests - it passed on both GHA and my Linux box.

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PR Comment: https://git.openjdk.org/jdk/pull/27080#issuecomment-3270165692