linux-kernel - [PATCH 1/4] ext2: remove inode constructor

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Date:	Sat, 5 May 2007 12:57:46 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	akpm@...ux-foundation.org
cc:	linux-kernel@...r.kernel.org, sct@...hat.com,
	adilger@...sterfs.com, clameter@....com
Subject: [PATCH 1/4] ext2: remove inode constructor

From: Pekka Enberg <penberg@...helsinki.fi>

As alloc_inode() touches the same cache line as init_once(), we gain
nothing from using slab constructors.

Cc: Stephen C. Tweedie <sct@...hat.com>
Cc: Andreas Dilger <adilger@...sterfs.com>
Cc: Christoph Lameter <clameter@....com>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 fs/ext2/super.c |   32 +++++++++++++-------------------
 1 file changed, 13 insertions(+), 19 deletions(-)

Index: 26-mm/fs/ext2/super.c
===================================================================
--- 26-mm.orig/fs/ext2/super.c	2007-05-05 12:26:15.000000000 +0300
+++ 26-mm/fs/ext2/super.c	2007-05-05 12:30:50.000000000 +0300
@@ -140,16 +140,24 @@ static struct kmem_cache * ext2_inode_ca
 static struct inode *ext2_alloc_inode(struct super_block *sb)
 {
 	struct ext2_inode_info *ei;
-	ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep,
-						GFP_KERNEL|__GFP_RECLAIMABLE);
+	struct inode *inode;
+
+	ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL|__GFP_RECLAIMABLE);
 	if (!ei)
 		return NULL;
+	rwlock_init(&ei->i_meta_lock);
+#ifdef CONFIG_EXT2_FS_XATTR
+	init_rwsem(&ei->xattr_sem);
+#endif
+	mutex_init(&ei->truncate_mutex);
 #ifdef CONFIG_EXT2_FS_POSIX_ACL
 	ei->i_acl = EXT2_ACL_NOT_CACHED;
 	ei->i_default_acl = EXT2_ACL_NOT_CACHED;
 #endif
-	ei->vfs_inode.i_version = 1;
-	return &ei->vfs_inode;
+	inode = &ei->vfs_inode;
+	inode_init_once(inode);
+	inode->i_version = 1;
+	return inode;
 }
 
 static void ext2_destroy_inode(struct inode *inode)
@@ -157,27 +165,13 @@ static void ext2_destroy_inode(struct in
 	kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
 }
 
-static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
-{
-	struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
-
-	if (flags & SLAB_CTOR_CONSTRUCTOR) {
-		rwlock_init(&ei->i_meta_lock);
-#ifdef CONFIG_EXT2_FS_XATTR
-		init_rwsem(&ei->xattr_sem);
-#endif
-		mutex_init(&ei->truncate_mutex);
-		inode_init_once(&ei->vfs_inode);
-	}
-}
- 
 static int init_inodecache(void)
 {
 	ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
 					     sizeof(struct ext2_inode_info),
 					     0, (SLAB_RECLAIM_ACCOUNT|
 						SLAB_MEM_SPREAD),
-					     init_once, NULL);
+					     NULL, NULL);
 	if (ext2_inode_cachep == NULL)
 		return -ENOMEM;
 	return 0;
-
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