RFR(XS): 8005875: G1: Kitchensink fails with ParallelGCThreads=0

[John Cuthbertson]

Hi Everyone,

Here's a new webrev based upon feedback from Vitaly and Bengt: 
http://cr.openjdk.java.net/~johnc/8005875/webrev.1/

I've wrapped the check with the asserts suggested by Bengt into a small 
routine.

Testing:
GC test suite with ConcGCThreads=3
Kitchensink with ParallelGCThreads=0:

Thanks,

JohnC

On 1/8/2013 2:13 PM, John Cuthbertson wrote:
> Hi Everyone,
>
> Can I please have a couple of volunteers look over the fix for this CR 
> - the webrev can be found at: 
> http://cr.openjdk.java.net/~johnc/8005875/webrev.0/
>
> Summary:
> One of the modules in the Kitchensink test generates a VM_PrintThreads 
> vm operation. The JVM crashes when it tries to print out G1's 
> concurrent marking worker threads when ParallelGCThreads=0 because the 
> work gang has not been created. The fix is to add the same check 
> that's used elsewhere in G1's concurrent marking.
>
> Testing:
> Kitchensink with ParallelGCThreads=0
>
> Thanks,
>
> JohnC