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| author | Eric Dumazet <dada1@cosmosbay.com> | 2006-03-26 01:37:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-26 08:56:56 -0800 |
| commit | fa3536cc144c1298f2ed9416c33f3b77fa2cd37a (patch) | |
| tree | 5484541319b86ae7dac0def4db7925f7cc7008e7 /fs/pipe.c | |
| parent | 878a9f30d7b13015f3aa4534d7877d985f150183 (diff) | |
| download | lwn-fa3536cc144c1298f2ed9416c33f3b77fa2cd37a.tar.gz lwn-fa3536cc144c1298f2ed9416c33f3b77fa2cd37a.zip | |
[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/pipe.c')
| -rw-r--r-- | fs/pipe.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/pipe.c b/fs/pipe.c index d976866a115b..4384c9290943 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -675,7 +675,7 @@ fail_page: return NULL; } -static struct vfsmount *pipe_mnt; +static struct vfsmount *pipe_mnt __read_mostly; static int pipefs_delete_dentry(struct dentry *dentry) { return 1; |