aboutsummaryrefslogtreecommitdiffstats
path: root/fs/locks.c
diff options
context:
space:
mode:
authorEric Dumazet <dada1@cosmosbay.com>2006-03-26 04:37:24 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-26 11:56:56 -0500
commitfa3536cc144c1298f2ed9416c33f3b77fa2cd37a (patch)
tree5484541319b86ae7dac0def4db7925f7cc7008e7 /fs/locks.c
parent878a9f30d7b13015f3aa4534d7877d985f150183 (diff)
[PATCH] Use __read_mostly on some hot fs variables
I discovered on oprofile hunting on a SMP platform that dentry lookups were slowed down because d_hash_mask, d_hash_shift and dentry_hashtable were in a cache line that contained inodes_stat. So each time inodes_stats is changed by a cpu, other cpus have to refill their cache line. This patch moves some variables to the __read_mostly section, in order to avoid false sharing. RCU dentry lookups can go full speed. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 56f996e98bbc..709450a7b89d 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -142,7 +142,7 @@ int lease_break_time = 45;
142static LIST_HEAD(file_lock_list); 142static LIST_HEAD(file_lock_list);
143static LIST_HEAD(blocked_list); 143static LIST_HEAD(blocked_list);
144 144
145static kmem_cache_t *filelock_cache; 145static kmem_cache_t *filelock_cache __read_mostly;
146 146
147/* Allocate an empty lock structure. */ 147/* Allocate an empty lock structure. */
148static struct file_lock *locks_alloc_lock(void) 148static struct file_lock *locks_alloc_lock(void)