JDK-6291341: jstat: FGC counter confusing when CMS GC is used

Jon Masamitsu jon.masamitsu at oracle.com
Tue Mar 8 22:08:27 UTC 2016


We're discussing this.

What would the result be if the GC team made the
JVM changes that you want to contribute.  Meaning,
without the jdk changes, will jstat continue to work
as it currently does?  Would the changes in the JVM
be useful to you without the jstat changes?  By the
JVM changes, I mean the changes for the counters.

The reason I ask is that the GC team does not
own jstat.   If I can integrate the JVM changes
without the jstat changes, it makes it a little


On 3/8/2016 6:38 AM, Yasumasa Suenaga wrote:
> Hi all,
> I discussed about FullGC counter for Concurrent GC:
>      http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2016-March/016774.html
> I found same issue on JBS:
>      JDK-6291341: jstat: FGC counter confusing when CMS GC is used
> JDK-6291341 was closed with Cannot Reproduce.
> However, I showed cause of this issue in above thread.
> I uploaded patches for this issue:
>      hotspot:http://cr.openjdk.java.net/~ysuenaga/JDK-6291341/poc/hotspot/
>          jdk:http://cr.openjdk.java.net/~ysuenaga/JDK-6291341/poc/jdk/
> JDK webrev includes testcase update.
> All tests for jstat work fine.
> Should I work for it as new issue? Or should I reopen JDK-6291341?
> I cannot access JPRT.
> So I need a sponsor.
> Thanks,
> Yasumasa

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