RFR (XS): 8054808: Bitmap verification sometimes fails after Full GC aborts concurrent mark

[Thomas Schatzl]

Hi Bengt and Jon,

  thanks for the reviews :)

On Thu, 2014-08-28 at 10:02 +0200, Bengt Rutisson wrote:
> Hi Thomas,
> 
> (Had an offline discussion with Thomas about this. Replying here for the 
> record.)
> 
> The proposed fix works fine but there is a slightly simpler solution. 
> For all HeapRegions we store the original end value in a variable that 
> does not change. We could use that for this fix instead of having to 
> calculate the end value.
> 
> Something like:
> 
> HeapWord* end = r->orig_end();
> return _bitmap->getNextMarkedWordAddress(r->bottom(), end) != end;
> 

New webrev implementing this at
http://cr.openjdk.java.net/~tschatzl/8054808/webrev.1/

Thanks,
  Thomas