From: Theodore Ts'o <tytso@mit.edu>
Date: Wed, 30 Sep 2009 04:32:42 +0000 (-0400)
Subject: ext4: Use tracepoints for mb_history trace file
X-Git-Tag: v2.6.32-rc3~60^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=296c355cd6443d89fa251885a8d78778fe111dc4;p=pandora-kernel.git

ext4: Use tracepoints for mb_history trace file

The /proc/fs/ext4/<dev>/mb_history was maintained manually, and had a
number of problems: it required a largish amount of memory to be
allocated for each ext4 filesystem, and the s_mb_history_lock
introduced a CPU contention problem.

By ripping out the mb_history code and replacing it with ftrace
tracepoints, and we get more functionality: timestamps, event
filtering, the ability to correlate mballoc history with other ext4
tracepoints, etc.

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