linux-kernel - Re: [PATCH 1/6] pagemap: avoid splitting thp when reading /proc/pid/pagemap

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Message-ID: <CAJd=RBDLEWuAKmRcaUJXuz=h9_3kaexbdGyqv7KXn+dmMeUvCQ@mail.gmail.com>
Date:	Sun, 29 Jan 2012 21:17:32 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Hillf Danton <dhillf@...il.com>
Subject: Re: [PATCH 1/6] pagemap: avoid splitting thp when reading /proc/pid/pagemap

Hi Naoya

On Sat, Jan 28, 2012 at 7:02 AM, Naoya Horiguchi
<n-horiguchi@...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?

Thanks
Hillf
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