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From: Andrea Arcangeli <aarcange@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: raz ben yehuda <raziebe@gmail.com>,
	lkml <linux-kernel@vger.kernel.org>,
	riel@redhat.com, kosaki.motohiro@jp.fujitsu.com,
	akpm@linux-foundation.org
Subject: Re: 2.6.38 page_test regression
Date: Fri, 15 Apr 2011 01:38:42 +0200	[thread overview]
Message-ID: <20110414233842.GJ15707@random.random> (raw)
In-Reply-To: <20110414231648.GA30898@csn.ul.ie>

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...

  reply	other threads:[~2011-04-14 23:39 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1302692638.15225.14.camel@raz.scalemp.com>
     [not found] ` <20110413125146.GR29444@random.random>
2011-04-13 13:48   ` 2.6.38 sbrk regression raz ben yehuda
2011-04-13 14:06   ` raz ben yehuda
2011-04-13 17:21     ` Andrea Arcangeli
2011-04-14  8:13       ` raz ben yehuda
2011-04-14 11:49       ` raz ben yehuda
2011-04-14 15:09         ` Andrea Arcangeli
2011-04-14 20:07           ` 2.6.38 page_test regression raz ben yehuda
2011-04-14 21:53             ` Mel Gorman
2011-04-14 23:16               ` Mel Gorman
2011-04-14 23:38                 ` Andrea Arcangeli [this message]
2011-04-14 23:32               ` Andrea Arcangeli
2011-04-14 23:44                 ` Andrea Arcangeli
2011-04-15  9:11                   ` Mel Gorman

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