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From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Subject: Re: [PATCH 1/6] pagemap: avoid splitting thp when reading /proc/pid/pagemap
Date: Mon, 30 Jan 2012 14:23:52 -0500
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To: Hillf Danton <dhillf@gmail.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>, David Rientjes <rientjes@google.com>, Andi Kleen <andi@firstfloor.org>, Wu Fengguang <fengguang.wu@intel.com>, Andrea Arcangeli <aarcange@redhat.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, LKML <linux-kernel@vger.kernel.org>

On Sun, Jan 29, 2012 at 09:17:32PM +0800, Hillf Danton wrote:
> Hi Naoya
> 
> On Sat, Jan 28, 2012 at 7:02 AM, Naoya Horiguchi
> <n-horiguchi@ah.jp.nec.com> wrote:
> > Thp split is not necessary if we explicitly check whether pmds are
> > mapping thps or not. This patch introduces this check and adds code
> > to generate pagemap entries for pmds mapping thps, which results in
> > less performance impact of pagemap on thp.
> >
> 
> Could the method proposed here cover the two cases of split THP in mem cgroup?

No for now, but yes if "move charge" function supports THP.
I think this can be a bit large step so it is the next work.

Thanks,
Naoya

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