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authorTheodore Ts'o <tytso@mit.edu>2010-08-04 03:35:12 +0200
committerTheodore Ts'o <tytso@mit.edu>2010-08-04 03:35:12 +0200
commita931da6ac9331a6c80dd91c199105806f2336188 (patch)
tree2d4ea766def9a98d21c2379f41e796b0e57ccd6b /fs/ocfs2
parentjbd2: Use atomic variables to avoid taking t_handle_lock in jbd2_journal_stop (diff)
downloadlinux-a931da6ac9331a6c80dd91c199105806f2336188.tar.xz
linux-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/ocfs2')
-rw-r--r--fs/ocfs2/journal.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 47878cf16418..9c1b92ebeb94 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -760,13 +760,13 @@ void ocfs2_set_journal_params(struct ocfs2_super *osb)
if (osb->osb_commit_interval)
commit_interval = osb->osb_commit_interval;
- spin_lock(&journal->j_state_lock);
+ write_lock(&journal->j_state_lock);
journal->j_commit_interval = commit_interval;
if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
journal->j_flags |= JBD2_BARRIER;
else
journal->j_flags &= ~JBD2_BARRIER;
- spin_unlock(&journal->j_state_lock);
+ write_unlock(&journal->j_state_lock);
}
int ocfs2_journal_init(struct ocfs2_journal *journal, int *dirty)