RFR (S): 7176220 'Full GC' events miss date stamp information occasionally

[Andreas Eriksson]

Hi all,

Please take a look at my changes for bug 7176220.
The problem is that CMS sometimes misses datestamps for time trace 
printouts.

The proposed fix is to move the datestamp print logic into the class 
that handles time trace printouts, GCTraceTime.
This would make it consistent with timestamps, which are already printed 
from there.

Bugs.sun:
http://bugs.sun.com/view_bug.do?bug_id=7176220

JIRA:
https://jbs.oracle.com/bugs/browse/JDK-7176220

Webrev:
http://cr.openjdk.java.net/~aeriksso/7176220/webrev.00/

Testing:
jprt, jtreg

Thanks,
Andreas