Request for review (S): 8005489: VM hangs during GC with ParallelGC and ParallelGCThreads=0

[Bengt Rutisson]

Thanks for the reviews, Vitaly, Erik and Stefan!

Pushing this now.

Bengt

On 1/9/13 9:45 AM, Stefan Karlsson wrote:
> Looks good.
>
> StefanK
>
> On 01/08/2013 11:16 AM, Bengt Rutisson wrote:
>>
>> Hi all,
>>
>> Could I have a couple of reviews for this change. The parallel 
>> collector needs at least one GC worker thread to function properly . 
>> Setting ParallelGCThreads=0 on the command line causes the parallel 
>> collector to hang in product builds and assert in debug builds. This 
>> has been the case back to JDK6u14.
>>
>> The fix will instead print an error message and exit the VM if 
>> ParallelGCThreads=0 is used with UseParallelGC. This is similar to 
>> what we recently did for the ParNew collector.
>>
>> http://cr.openjdk.java.net/~brutisso/8005489/webrev.00/
>>
>> Thanks,
>> Bengt
>