linux-kernel - Re: [PATCH] Improve heuristic detecting sequential reads

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Date:	11 Apr 2007 00:56:51 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jan Kara <jack@...e.cz>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	npiggin@...e.de
Subject: Re: [PATCH] Improve heuristic detecting sequential reads

Jan Kara <jack@...e.cz> writes:

>   Hello!
> 
>   In thread http://lkml.org/lkml/2007/3/9/403, we discussed a problem
> with the current heuristic for detecting sequential IO in
> do_generic_mapping_read() - for small files a page is marked as accessed
> only once which can cause a performance problems.
>   Attached is a patch that improves the heuristic by introducing a
> ra.offset variable so now we can reliably detect sequetial reads.
> The patch replaces Nick's patch from http://lkml.org/lkml/2007/3/15/177
> (Nick has acked to replace the patch). Could you please put the patch
> into -mm?

There's a much more complete patchkit for this that gets reposted
regularly on l-k. Perhaps it would make sense to test that first?

-Andi
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