RFR: 8166811: Missing memory fences between memory allocation and refinement

[Kim Barrett]

> On Nov 17, 2016, at 12:28 PM, Erik Helin <erik.helin at oracle.com> wrote:
> 
> First of all, thanks for doing this tricky work. One initial comment:
> 
> 659   // Iterate over the objects overlapping the card designated by
> 660   // card_ptr, applying cl to all references in the region.  This
> 661   // is a helper for G1RemSet::refine_card, and is tightly coupled
> 662   // with it.
> 
> In the first sentence you mention the now removed argument card_ptr. Maybe just reword this to "Iterate over the objects covered by the memory region, applying cl to all references in the region”?

You’re right, I missed updating the comment when the signature was changed.
Changing to:

  // Iterate over the objects overlapping part of a card, applying cl
  // to all references in the region.  This is a helper for
  // G1RemSet::refine_card, and is tightly coupled with it.

which is still immediately followed by:

  // mr: the memory region covered by the card, trimmed to the
  // allocated space for this region.  Must not be empty.