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authorTheodore Ts'o <tytso@mit.edu>2010-08-03 21:35:12 -0400
committerTheodore Ts'o <tytso@mit.edu>2010-08-03 21:35:12 -0400
commita931da6ac9331a6c80dd91c199105806f2336188 (patch)
tree2d4ea766def9a98d21c2379f41e796b0e57ccd6b /include/linux/jbd2.h
parenta51dca9cd3bb4ec5a05bfb6feabf024a5c808a37 (diff)
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op-kernel-dev-a931da6ac9331a6c80dd91c199105806f2336188.tar.gz
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.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index a72ce21..15d5743 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]
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