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

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Date:	Tue, 10 Apr 2007 17:54:11 +0200
From:	Jan Kara <jack@...e.cz>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, npiggin@...e.de
Subject: [PATCH] Improve heuristic detecting sequential reads

  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?

							Bye
								Honza

-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs

View attachment "readahead-2.6.21-rc6.diff" of type "text/x-patch" (3582 bytes)