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ext4: Use tracepoints for mb_history trace file

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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>
This commit is contained in:
Theodore Ts'o
2009-09-30 00:32:42 -04:00
parent 90576c0b9a
commit 296c355cd6
6 changed files with 182 additions and 348 deletions
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Documentation/filesystems/proc.txt
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@@ -1113,7 +1113,6 @@ Table 1-12: Files in /proc/fs/ext4/<devname>
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File Content
mb_groups details of multiblock allocator buddy cache of free blocks
mb_history multiblock allocation history
..............................................................................