From c4ae0c65455c1bb30d1b71c6dd9a1a62aadde8ef Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 28 Jul 2011 06:55:13 +0200 Subject: [PATCH] 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 Signed-off-by: Al Viro --- fs/inode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/inode.c b/fs/inode.c index e445be2..5aab80d 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); -- 2.7.4