RFR(XXS): 7147806: G1: Crash in vm bootstrap when running with -XX:+UseG1GC -XX:-UsePerfData

Igor Veresov igor.veresov at oracle.com
Wed Feb 22 16:38:30 PST 2012

Looks good. 


On Wednesday, February 22, 2012 at 12:10 PM, John Cuthbertson wrote:

> Hi Everyone,
> Can I have a couple of volunteers to review the changes for this CR? The 
> webrev can be found at: http://cr.openjdk.java.net/~johnc/7147806/webrev.0/
> The issues here was that some updates to the G1 performance counter 
> variables were not guarded. In the other collectors, the generation and 
> collector performance counters are allocated/initialized 
> unconditionally. The performance counter variables that these counters 
> contain, however, are allocated and updated only if UsePerfData is 
> enabled. In G1, some of these updates were not suitably guarded and so 
> we tried to update some unallocated performance counter variables.
> Testing:
> * Small test case (gcbasher) with the offending command line flag 
> combination and with just G1.
> Thanks,
> JohnC 

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