RFR(S): 7190666: G1: assert(_unused == 0) failed: Inconsistency in PLAB stats

[Thomas Schatzl]

Hi,

On Mon, 2012-08-27 at 17:36 -0700, John Cuthbertson wrote:
> Hi Everyone,
> 
> Can I have a couple of volunteers review the changes for this CR? The 
> webrev can be found at: http://cr.openjdk.java.net/~johnc/7190666/webrev.0/
> 
>
> Note while testing this I ran into some assertion and guarantee failures 
> from G1's block offset table. I've only seen and been able (so far) to 
> reproduce these failures on a single machine in the jprt pool. I will be 
> submitting a new CR for these failures. I do not believe that the 
> failures are related to this fix (or the change that enabled resize-able 
> PLABS) as I've been able to reproduce the failures with disabling 
> ResizePLAB and setting OldPLABSize=8k, 16k, and 32k.

Could you describe the failure/assertion and possibly any circumstances
it occurs? I've run into some card table issues some time ago too.
(or the CR to see the description)

Maybe, coincidently, they're the same.

Thomas