Fix tenuring threshold reported in GCYoungGarbageCollection event

[Erik Helin]

Hi Carsten,

On 2015-10-07, Carsten Varming wrote:
> Dear Hotspot-gc-dev members,
> 
> I noticed that the GCYoungGarbageCollection trace event reports the
> tenuring threshold of the next gc, i.e., not the gc with the gcId in the
> event, when using ParellelGC or ParNew (G1 seems to be correct). It looks
> like the variable _tenuring_threshold is adjusted for the next gc before
> the event is fired.
> 
> I attached a small patch against the current jdk9 repo that fixes the issue.

nice catch and thanks for the patch! The GC and runtime team usually
work in the hotspot repo at
http://hg.openjdk.java.net/jdk9/hs-rt/hotspot, but the patch applied
there as well. I created a bug and also uploaded a webrev to make it
easier for other reviewers to have a look:

Bug:
https://bugs.openjdk.java.net/browse/JDK-8139134

Webrev:
http://cr.openjdk.java.net/~ehelin/carsten/8139134/webrev.00/

The patch looks good, Reviewed. I will sponsor the patch (push it to
the repository) once another reviewer have had a look. I didn't find your
name the OCA signatories list [0], so you need the sign the OCA [1]
before I can push the patch.

On 2015-10-07, Carsten Varming wrote:
> Let me know if this is the wrong email list for this type of change.

This is the correct list.

Thanks,
Erik

> Carsten

[0]: http://www.oracle.com/technetwork/community/oca-486395.html
[1]: http://openjdk.java.net/contribute/