RFR: 8291753: Add JFR event for GC CPU Time

[Erik Gahlin]

On Thu, 4 Aug 2022 23:58:02 GMT, Sangheon Kim <sangheki at openjdk.org> wrote:

> Hi all,
> 
> Could I have reviews to add new JFR event for GC CPU time?
> Currently only log message is available for CPU time (user, system, real).
> As there is already GCTraceCPUTime class which is used for a log message, I added GCTracer to deliver the event.
> The log message of CPU time is printed after GC is completed and tried to keep same.
> 
> For G1, manually checked there is not difference.
> 
> For test, I had to add an exception as GCCpuTime will be generated after GC end.
> 
> Testing: tier 1 ~ 3
> 
> Thanks,
> Sangheon

Does this event doesn't provide CPU usage for ZGC and Shenandoah?

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