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vfs: avoid taking inode_hash_lock on pipes and sockets 

Some inodes (pipes, sockets, ...) are not hashed, no need to take
contended inode_hash_lock at dismantle time.

nice speedup on SMP machines on socket intensive workloads.

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 06:41:09 +02:00 committed by Al Viro
parent b12362bdb6
commit f2ee7abf4c
2 changed files with 11 additions and 4 deletions
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6
fs/inode.c
View File

@ -399,12 +399,12 @@ void __insert_inode_hash(struct inode *inode, unsigned long hashval)
EXPORT_SYMBOL(__insert_inode_hash); EXPORT_SYMBOL(__insert_inode_hash);
/** /**
* remove_inode_hash - remove an inode from the hash * __remove_inode_hash - remove an inode from the hash
* @inode: inode to unhash * @inode: inode to unhash
* *
* Remove an inode from the superblock. * Remove an inode from the superblock.
*/ */
void remove_inode_hash(struct inode *inode) void __remove_inode_hash(struct inode *inode)
{ {
spin_lock(&inode_hash_lock); spin_lock(&inode_hash_lock);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
@ -412,7 +412,7 @@ void remove_inode_hash(struct inode *inode)
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
spin_unlock(&inode_hash_lock); spin_unlock(&inode_hash_lock);
} }
EXPORT_SYMBOL(remove_inode_hash); EXPORT_SYMBOL(__remove_inode_hash);
void end_writeback(struct inode *inode) void end_writeback(struct inode *inode)
{ {

9
include/linux/fs.h
View File

@ -2317,11 +2317,18 @@ extern int should_remove_suid(struct dentry *);
extern int file_remove_suid(struct file *); extern int file_remove_suid(struct file *);
extern void __insert_inode_hash(struct inode *, unsigned long hashval); extern void __insert_inode_hash(struct inode *, unsigned long hashval);
extern void remove_inode_hash(struct inode *);
static inline void insert_inode_hash(struct inode *inode) static inline void insert_inode_hash(struct inode *inode)
{ {
__insert_inode_hash(inode, inode->i_ino); __insert_inode_hash(inode, inode->i_ino);
} }
extern void __remove_inode_hash(struct inode *);
static inline void remove_inode_hash(struct inode *inode)
{
if (!inode_unhashed(inode))
__remove_inode_hash(inode);
}
extern void inode_sb_list_add(struct inode *inode); extern void inode_sb_list_add(struct inode *inode);
#ifdef CONFIG_BLOCK #ifdef CONFIG_BLOCK