Re: [PATCH v3 10/10] thp: implement refcounting for huge zero page

From: Kirill A. Shutemov
Date: Thu Sep 13 2012 - 13:37:58 EST

On Thu, Sep 13, 2012 at 07:16:13PM +0200, Andrea Arcangeli wrote:
> Hi Kirill,
> On Wed, Sep 12, 2012 at 01:07:53PM +0300, Kirill A. Shutemov wrote:
> > - hpage = alloc_pages(GFP_TRANSHUGE | __GFP_ZERO, HPAGE_PMD_ORDER);
> The page is likely as large as a pageblock so it's unlikely to create
> much fragmentation even if the __GFP_MOVABLE is set. Said that I guess
> it would be more correct if __GFP_MOVABLE was clear, like
> (GFP_TRANSHUGE | __GFP_ZERO) & ~__GFP_MOVABLE because this page isn't
> really movable (it's only reclaimable).

Good point. I'll update the patchset.

> The xchg vs xchgcmp locking also looks good.
> Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>

Is it for the whole patchset? :)

Kirill A. Shutemov
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