linux-kernel - Re: [patch 10/21] buffer heads: Support slab defrag

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Message-ID: <Pine.LNX.4.64.0805151041230.18708@schroedinger.engr.sgi.com>
Date:	Thu, 15 May 2008 10:42:15 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Chinner <dgc@....com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	andi@...stfloor.org, Rik van Riel <riel@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>, mpm@...enic.com
Subject: Re: [patch 10/21] buffer heads: Support slab defrag

On Mon, 12 May 2008, David Chinner wrote:

> If you are going to clean bufferheads (or pages), please clean entire
> mappings via ->writepages as it leads to far superior I/O patterns
> and a far higher aggregate rate of page cleaning.....

That brings up another issue: Lets say I use writepages on a large file 
(couple of gig). How much do you want to write back?

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