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>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/inode.c b/fs/inode.c
index e445be2a18f9..5aab80dc008c 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);