Commit c4ae0c65 authored Jul 28, 2011 by Eric Dumazet Committed by Al Viro Aug 01, 2011

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>

parent f2ee7abf

fs/inode.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1330,6 +1330,7 @@ static void iput_final(struct inode *inode)
		}

		inode->i_state \|= I_FREEING;
		if (!list_empty(&inode->i_lru))
		inode_lru_list_del(inode);
		spin_unlock(&inode->i_lock);