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| author | Theodore Ts'o <tytso@mit.edu> | 2009-09-30 08:32:42 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-09-30 08:32:42 +0400 |
| commit | 296c355cd6443d89fa251885a8d78778fe111dc4 (patch) | |
| tree | 5cf7c8b115617dc3829a16a5969894d37b73173c /Documentation | |
| parent | 90576c0b9a0b5323fc4bd7f23f49be0d234f36d1 (diff) | |
| download | linux-296c355cd6443d89fa251885a8d78778fe111dc4.tar.xz | |
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/proc.txt | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index b5aee7838a00..2c48f945546b 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -1113,7 +1113,6 @@ Table 1-12: Files in /proc/fs/ext4/<devname> .............................................................................. File Content mb_groups details of multiblock allocator buddy cache of free blocks - mb_history multiblock allocation history .............................................................................. |