RFR: 8028787: tmtools/jstat/gcoldcapacity/jstat_gcoldcapacity02 fails nsk.share.Failure: OGC < OGCMN in RT_Baseline

Stefan Karlsson stefan.karlsson at oracle.com
Tue Aug 26 10:05:29 UTC 2014


On 26/08/14 11:46, Stefan Johansson wrote:
> Hi,
>
> Please review this fix for:
> https://bugs.openjdk.java.net/browse/JDK-8028787
>
> Webrev:
> http://cr.openjdk.java.net/~sjohanss/8028787/webrev.00

Looks good. Thanks for fixing this!

StefanK

>
> Summary:
> When setting up the counters used by jstat for determining the min and 
> max size of the generations we currently do not use the collector 
> policy to get these values. Instead the underlying space has been 
> used, and that do not have any notion of a minimum. Changing to use 
> the collector policy will avoid the problems we are seeing where the 
> current capacity is smaller than the minimum. This was previously 
> possible if a generation was resized to something smaller than the 
> initial size (which was setup as minimum for the counter).
>
> Testing:
> I did not manage to reproduce the failure with the test in question on 
> my machine but I was able to manually construct the same symptoms 
> (getting a smaller OGC than OGCMN) using the default collector and 
> with this fix they are gone.
>
> Thanks,
> StefanJ



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