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vfs: avoid call to inode_lru_list_del() if possible

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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>
This commit is contained in:
Eric Dumazet 2011-07-28 06:55:13 +02:00 committed by Al Viro
parent f2ee7abf4c
commit c4ae0c6545
1 changed files with 2 additions and 1 deletions
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3
fs/inode.c
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@ -1330,7 +1330,8 @@ static void iput_final(struct inode *inode)
} }
inode->i_state |= I_FREEING; 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); spin_unlock(&inode->i_lock);
evict(inode); evict(inode);