From: Theodore Ts'o <tytso@mit.edu>
Date: Fri, 10 Oct 2008 03:53:47 +0000 (-0400)
Subject: ext4: Use readahead when reading an inode from the inode table
X-Git-Tag: v2.6.28-rc1~709^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=240799cdf22bd789ea6852653c3b879d35ad0a6c;p=pandora-kernel.git

ext4: Use readahead when reading an inode from the inode table

With modern hard drives, reading 64k takes roughly the same time as
reading a 4k block.  So request readahead for adjacent inode table
blocks to reduce the time it takes when iterating over directories
(especially when doing this in htree sort order) in a cold cache case.
With this patch, the time it takes to run "git status" on a kernel
tree after flushing the caches via "echo 3 > /proc/sys/vm/drop_caches"
is reduced by 21%.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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