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Date: Mon, 3 Dec 2012 10:15:04 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Bob Liu <lliubbo@gmail.com>
Cc: Jiri Slaby <jslaby@suse.cz>, linux-mm@kvack.org,
        LKML <linux-kernel@vger.kernel.org>,
        David Rientjes <rientjes@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH 1/2] thp: fix anononymous page accounting in fallback
 path for COW of HZP
Message-ID: <20121203081504.GA12070@otc-wbsnb-06>
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On Mon, Dec 03, 2012 at 11:14:38AM +0800, Bob Liu wrote:
> On Fri, Nov 30, 2012 at 11:03 PM, Kirill A. Shutemov
> <kirill.shutemov@linux.intel.com> wrote:
> > From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> >
> > Don't forget to account newly allocated page in fallback path for
> > copy-on-write of huge zero page.
> >
>=20
> What about fallback path in do_huge_pmd_wp_page_fallback()?
> I think we should also account newly allocated page in it.

No. Normal huge pages has already accounted on fork(). See
copy_huge_pmd().

Huge zero page (as 4k zero page) doesn't contribute to RSS, so we need to
account the page which replaces huge zero page on COW.
--=20
 Kirill A. Shutemov

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