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authorEric Dumazet <eric.dumazet@gmail.com>2011-07-28 06:55:13 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2011-08-01 01:41:17 -0400
commitc4ae0c65455c1bb30d1b71c6dd9a1a62aadde8ef (patch)
tree75d45726ff5f09955054a665e368b919faf4c105 /fs/inode.c
parentf2ee7abf4c40c8e6bffced923a7c01ea2d1f6c97 (diff)
downloadlinux-c4ae0c65455c1bb30d1b71c6dd9a1a62aadde8ef.tar.gz
vfs: avoid call to inode_lru_list_del() if possible
inode_lru_list_del() is expensive because of per superblock lru locking, while some inodes are not in lru list. Adding a check in iput_final() can speedup pipe/sockets workloads on SMP. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/inode.c b/fs/inode.c
index e445be2a18f..5aab80dc008 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1330,7 +1330,8 @@ static void iput_final(struct inode *inode)
}
inode->i_state |= I_FREEING;
- inode_lru_list_del(inode);
+ if (!list_empty(&inode->i_lru))
+ inode_lru_list_del(inode);
spin_unlock(&inode->i_lock);
evict(inode);