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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/namespace.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/namespace.c')
-rw-r--r--fs/namespace.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 71e75bcf4d28..e069a4c5e389 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -43,9 +43,9 @@ __cacheline_aligned_in_smp DEFINE_SPINLOCK(vfsmount_lock);
43 43
44static int event; 44static int event;
45 45
46static struct list_head *mount_hashtable; 46static struct list_head *mount_hashtable __read_mostly;
47static int hash_mask __read_mostly, hash_bits __read_mostly; 47static int hash_mask __read_mostly, hash_bits __read_mostly;
48static kmem_cache_t *mnt_cache; 48static kmem_cache_t *mnt_cache __read_mostly;
49static struct rw_semaphore namespace_sem; 49static struct rw_semaphore namespace_sem;
50 50
51/* /sys/fs */ 51/* /sys/fs */