linux-kernel - Re: 2.6.38 page

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Message-ID: <20110414233842.GJ15707@random.random>
Date:	Fri, 15 Apr 2011 01:38:42 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	raz ben yehuda <raziebe@...il.com>,
	lkml <linux-kernel@...r.kernel.org>, riel@...hat.com,
	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org
Subject: Re: 2.6.38 page_test regression

On Fri, Apr 15, 2011 at 12:16:48AM +0100, Mel Gorman wrote:
> Theories better than slightly-different-register-use are welcome.

__pte_alloc_one is now skipped 511 times every 512 page faults, so we
call alloc_pages 512 times less and we take page_table_lock 512 times
less, that explains it I think. We need it...
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