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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 /fs/ext4/inode.c | |
| parent | a51dca9cd3bb4ec5a05bfb6feabf024a5c808a37 (diff) | |
| download | linux-stable-a931da6ac9331a6c80dd91c199105806f2336188.tar.gz linux-stable-a931da6ac9331a6c80dd91c199105806f2336188.tar.bz2 linux-stable-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 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 533b607f9cb5..ab2247d642c6 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5066,7 +5066,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino) transaction_t *transaction; tid_t tid; - spin_lock(&journal->j_state_lock); + read_lock(&journal->j_state_lock); if (journal->j_running_transaction) transaction = journal->j_running_transaction; else @@ -5075,7 +5075,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino) tid = transaction->t_tid; else tid = journal->j_commit_sequence; - spin_unlock(&journal->j_state_lock); + read_unlock(&journal->j_state_lock); ei->i_sync_tid = tid; ei->i_datasync_tid = tid; } |