linux-kernel - Re: [patch 00/14] Page cache cleanup in anticipation of Large Blocksize support

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Message-Id: <1182135603.22999.15.camel@laptopd505.fenrus.org>
Date:	Sun, 17 Jun 2007 20:00:02 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, hch@...radead.org
Subject: Re: [patch 00/14] Page cache cleanup in anticipation of Large
	Blocksize support

On Sun, 2007-06-17 at 19:08 -0700, Christoph Lameter wrote:
> On Sun, 17 Jun 2007, Matt Mackall wrote:
> 
> > Is it? Last I looked it had reverted to handing out reverse-contiguous
> > pages.
> 
> I thought that was fixed? Bill Irwin was working on it.
> 
> But the contiguous pages usually only work shortly after boot. After 
> awhile memory gets sufficiently scrambled that the coalescing in the I/O 
> layer becomes ineffective.

the buddy allocator at least defragments itself somewhat (granted, it's
not perfect and the per cpu page queues spoil the game too...)

-- 
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