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Commit f2ee7abf authored by Eric Dumazet's avatar Eric Dumazet Committed by Al Viro
Browse files

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: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent b12362bd

fs/inode.c

+3 −3
Original line number Diff line number Diff line
@@ -399,12 +399,12 @@ void __insert_inode_hash(struct inode *inode, unsigned long hashval) 
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

 *

 *	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->i_lock);
@@ -412,7 +412,7 @@ void remove_inode_hash(struct inode *inode) 
	spin_unlock(&inode->i_lock);

	spin_unlock(&inode_hash_lock);

}

EXPORT_SYMBOL(remove_inode_hash);

EXPORT_SYMBOL(__remove_inode_hash);



void end_writeback(struct inode *inode)

{

include/linux/fs.h

+8 −1
Original line number Diff line number Diff line
@@ -2317,11 +2317,18 @@ extern int should_remove_suid(struct dentry *); 
extern int file_remove_suid(struct file *);



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)

{

	__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);



#ifdef CONFIG_BLOCK