Integrated: 8364282: ZGC: Improve ZPageAllocation JFR event sending

[Joel Sikström]

On Tue, 29 Jul 2025 13:51:16 GMT, Joel Sikström <jsikstro at openjdk.org> wrote:

> Hello,
> 
> This is a follow up to [JDK-8350441](https://bugs.openjdk.org/browse/JDK-8350441), improving on how the ZPageAllocation JFR event is sent. 
> 
> The starting time for the event is measured separately from creating a local event varaible (EventZPageAllocation). This means it is better to use the anonymous EventZPageAllocation::commit rather than creating an event and sending that event, which would record the starting time again, unnecessarily.
> 
> Additionally, if the event is not enabled (either specifically or if JFR is disabled), we should not waste time sampling statistics for the event.
> 
> Testing:
> * Oracle's tier1-4

This pull request has now been integrated.

Changeset: b9f7caed
Author:    Joel Sikström <jsikstro at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/b9f7caed775e86e71f7d37789cb196fb1444ef12
Stats:     14 lines in 1 file changed: 3 ins; 0 del; 11 mod

8364282: ZGC: Improve ZPageAllocation JFR event sending

Reviewed-by: stefank, aboldtch

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PR: https://git.openjdk.org/jdk/pull/26534