linux-kernel - Re: [RFC][PATCH 1/3] pagemap: avoid splitting thp when reading /proc/pid/pagemap

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Message-ID: <20111219184506.GB5637@one.firstfloor.org>
Date:	Mon, 19 Dec 2011 19:45:06 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/3] pagemap: avoid splitting thp when reading /proc/pid/pagemap

On Mon, Dec 19, 2011 at 01:38:37PM -0500, Naoya Horiguchi wrote:
> Thp split is not necessary if we explicitly check whether pmds are
> mapping thps or not. This patch introduces the check and the code
> to generate pagemap entries for pmds mapping thps, which results in
> less performance impact of pagemap on thp.

Looks good.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>

-Andi
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