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[PATCH] Use __read_mostly on some hot fs variables

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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>
This commit is contained in:
Eric Dumazet
2006-03-26 01:37:24 -08:00
committed by Linus Torvalds
parent 878a9f30d7
commit fa3536cc14
12 changed files with 35 additions and 35 deletions
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6
fs/dcookies.c
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@@ -38,9 +38,9 @@ struct dcookie_struct {
static LIST_HEAD(dcookie_users);
static DEFINE_MUTEX(dcookie_mutex);
static kmem_cache_t * dcookie_cache;
static struct list_head * dcookie_hashtable;
static size_t hash_size;
static kmem_cache_t *dcookie_cache __read_mostly;
static struct list_head *dcookie_hashtable __read_mostly;
static size_t hash_size __read_mostly;
static inline int is_live(void)
{