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

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Message-ID: <20120913211705.GM3388@redhat.com>
Date:	Thu, 13 Sep 2012 23:17:05 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 10/10] thp: implement refcounting for huge zero page

Hi Kirill,

On Thu, Sep 13, 2012 at 08:37:58PM +0300, Kirill A. Shutemov wrote:
> 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@...hat.com>
> 
> Is it for the whole patchset? :)

It was meant for this one, but I reviewed the whole patchset and it
looks fine to me, so in this case it can apply to the whole patchset ;)
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