From: Curt Wohlgemuth <curtw@google.com>
Date: Sat, 2 May 2009 00:27:20 +0000 (-0400)
Subject: ext4: Make the length of the mb_history file tunable
X-Git-Tag: v2.6.31-rc1~396^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f40339031b04279c3fdde7ac5fe97db33b2a7694;p=pandora-kernel.git

ext4: Make the length of the mb_history file tunable

In memory-constrained systems with many partitions, the ~68K for each
partition for the mb_history buffer can be excessive.

This patch adds a new mount option, mb_history_length, as well as a
way of setting the default via a module parameter (or via a sysfs
parameter in /sys/module/ext4/parameter/default_mb_history_length).
If the mb_history_length is set to zero, the mb_history facility is
disabled entirely.

Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

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