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

[Stefan Johansson]

Hi,

Please review this fix for:
https://bugs.openjdk.java.net/browse/JDK-8028787

Webrev:
http://cr.openjdk.java.net/~sjohanss/8028787/webrev.00

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