RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning

[Patricio Chilano Mateo]

On Tue, 5 Nov 2024 08:19:34 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> src/hotspot/share/jfr/metadata/metadata.xml line 160:
>> 
>>> 158: 
>>> 159:   <Event name="VirtualThreadPinned" category="Java Virtual Machine, Runtime" label="Virtual Thread Pinned" thread="true" stackTrace="true">
>>> 160:     <Field type="string" name="blockingOperation" label="Blocking operation" />
>> 
>> Previously, the event was in the "Java Application" category. I think that was a better fit because it meant it was visualized in the same lane in a thread graph. See here for more information about the category:
>> 
>> https://docs.oracle.com/en/java/javase/21/docs/api/jdk.jfr/jdk/jfr/Category.html
>> 
>> (Note: The fact that the event is now written in the JVM doesn't determine the category.)
>
> Thanks for spotting this, it wasn't intended to change the category. I think it's that Event element was copied from another event when adding it to metadata.xml and value from `@Category` wasn't carried over.

Fixed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1829462765