RFR: 8196341: Add JFR events for parallel phases of G1

[Thomas Schatzl]

Hi Leo,

On Wed, 2018-09-05 at 14:27 +0200, Leo Korinth wrote:
> Hi,
> 
> I have added JFR events for the parallel phases of G1.
> 
> This change adds JFR events for most values of the enumeration 
> GCParPhases. I have also added a test case
> (TestG1ParallelPhases.java).
> 
> This is a rebase/rework of a previous post I did 31th of January
> that 
> never got pushed.
> 
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8196341
> 
> Webrev:
> http://cr.openjdk.java.net/~lkorinth/8196341/00/
> 
> Testing:
> - mach5 hs-tier1,hs-tier2,hs-tier3
> - brief visual inspection of result in JMC
> - new test TestG1ParallelPhases.java (100 runs)

  looks good.

We discussed this in private earlier, please consider implementing some
way to wrap JFR events in scoped objects. That would make the code much
simpler to read, and easier to add JFR events in the future too.

However this seems out of scope for this particular change.

Thanks,
  Thomas