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| author | Theodore Ts'o <tytso@mit.edu> | 2010-08-03 21:35:12 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-08-03 21:35:12 -0400 |
| commit | a931da6ac9331a6c80dd91c199105806f2336188 (patch) | |
| tree | 2d4ea766def9a98d21c2379f41e796b0e57ccd6b /include/linux/jbd2.h | |
| parent | a51dca9cd3bb4ec5a05bfb6feabf024a5c808a37 (diff) | |
| download | lwn-a931da6ac9331a6c80dd91c199105806f2336188.tar.gz lwn-a931da6ac9331a6c80dd91c199105806f2336188.zip | |
jbd2: Change j_state_lock to be a rwlock_t
Lockstat reports have shown that j_state_lock is a major source of
lock contention, especially on systems with more than 4 CPU cores. So
change it to be a read/write spinlock.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'include/linux/jbd2.h')
| -rw-r--r-- | include/linux/jbd2.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h index a72ce21de0e1..15d5743ccfbb 100644 --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -764,7 +764,7 @@ struct journal_s /* * Protect the various scalars in the journal */ - spinlock_t j_state_lock; + rwlock_t j_state_lock; /* * Number of processes waiting to create a barrier lock [j_state_lock] |