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authorTheodore Ts'o <tytso@mit.edu>2009-09-30 00:32:42 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-09-30 00:32:42 -0400
commit296c355cd6443d89fa251885a8d78778fe111dc4 (patch)
tree5cf7c8b115617dc3829a16a5969894d37b73173c /fs/jbd2
parent90576c0b9a0b5323fc4bd7f23f49be0d234f36d1 (diff)
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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