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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 /fs/ext4/inode.c
parenta51dca9cd3bb4ec5a05bfb6feabf024a5c808a37 (diff)
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.c4
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;
}