linux-kernel - Re: [PATCH 8/9] readahead: convert ext3/ext4 invocations

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Message-ID: <20070519121956.GD25563@one.firstfloor.org>
Date:	Sat, 19 May 2007 14:19:56 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Fengguang Wu <wfg@...l.ustc.edu.cn>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	Steven Pratt <slpratt@...tin.ibm.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH 8/9] readahead: convert ext3/ext4 invocations

On Thu, May 17, 2007 at 06:48:00AM +0800, Fengguang Wu wrote:
> Convert ext3/ext4 dir reads to use on-demand readahead.
> 
> Readahead for dirs operates _not_ on file level, but on blockdev level.
> This makes a difference when the data blocks are not continuous.
> And the read routine is somehow opaque: there's no handy info about the status
> of current page. So a simplified call scheme is employed: to call into
> readahead whenever the current page falls out of readahead windows.

ext2 too would be nice. Also when it goes in it might be worth
contacting linux-fsdevel with a quick pointer to this so that other
file systems can possibly benefit too.
-Andi

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