C14 [01/14] [PATCH 10/28] slub: Add debugging to verify correct cache use on kmem_cache_free()

C14 [01/14] [PATCH 10/28] slub: Add debugging to verify correct cache use on kmem_cache_free()

[Christoph Lameter]

Add additional debugging to check that the objects is actually from the cache
the caller claims. Doing so currently trips up some other debugging code. It
takes a lot to infer from that what was happening.

V2: Only warn once.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slub.c |    7 +++++++
 1 file changed, 7 insertions(+)

Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:13.218025791 -0500
+++ linux/mm/slub.c	2012-09-04 18:02:00.947707104 -0500
@@ -2614,6 +2614,13 @@ void kmem_cache_free(struct kmem_cache *
 
 	page = virt_to_head_page(x);
 
+	if (kmem_cache_debug(s) && page->slab != s) {
+		printk("kmem_cache_free: Wrong slab cache. %s but object"
+			" is from  %s\n", page->slab->name, s->name);
+		WARN_ON_ONCE(1);
+		return;
+	}
+
 	slab_free(s, page, x, _RET_IP_);
 
 	trace_kmem_cache_free(_RET_IP_, x);

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C14 [02/14] slub: Use kmem_cache for the kmem_cache structure

[Christoph Lameter]

Do not use kmalloc() but kmem_cache_alloc() for the allocation
of the kmem_cache structures in slub.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slub.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.710080309 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:59.767688688 -0500
@@ -213,7 +213,7 @@ static inline int sysfs_slab_alias(struc
 static inline void sysfs_slab_remove(struct kmem_cache *s)
 {
 	kfree(s->name);
-	kfree(s);
+	kmem_cache_free(kmem_cache, s);
 }
 
 #endif
@@ -3969,7 +3969,7 @@ struct kmem_cache *__kmem_cache_create(c
 	if (!n)
 		return NULL;
 
-	s = kmalloc(kmem_size, GFP_KERNEL);
+	s = kmem_cache_alloc(kmem_cache, GFP_KERNEL);
 	if (s) {
 		if (kmem_cache_open(s, n,
 				size, align, flags, ctor)) {
@@ -3986,7 +3986,7 @@ struct kmem_cache *__kmem_cache_create(c
 			list_del(&s->list);
 			kmem_cache_close(s);
 		}
-		kfree(s);
+		kmem_cache_free(kmem_cache, s);
 	}
 	kfree(n);
 	return NULL;
@@ -5224,7 +5224,7 @@ static void kmem_cache_release(struct ko
 	struct kmem_cache *s = to_slab(kobj);
 
 	kfree(s->name);
-	kfree(s);
+	kmem_cache_free(kmem_cache, s);
 }
 
 static const struct sysfs_ops slab_sysfs_ops = {

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C14 [09/14] Move duping of slab name to slab_common.c

[Christoph Lameter]

Duping of the slabname has to be done by each slab. Moving this code
to slab_common avoids duplicate implementations.

With this patch we have common string handling for all slab allocators.
Strings passed to kmem_cache_create() are copied internally. Subsystems
can create temporary strings to create slab caches.

Slabs allocated in early states of bootstrap will never be freed (and those
can never be freed since they are essential to slab allocator operations).
During bootstrap we therefore do not have to worry about duping names.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab_common.c |   30 +++++++++++++++++++++---------
 mm/slub.c        |   21 ++-------------------
 2 files changed, 23 insertions(+), 28 deletions(-)

Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.802081734 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:55.531622575 -0500
@@ -100,6 +100,7 @@ struct kmem_cache *kmem_cache_create(con
 {
 	struct kmem_cache *s = NULL;
 	int err = 0;
+	char *n;
 
 	get_online_cpus();
 	mutex_lock(&slab_mutex);
@@ -108,16 +109,26 @@ struct kmem_cache *kmem_cache_create(con
 		goto out_locked;
 
 
-	s = __kmem_cache_create(name, size, align, flags, ctor);
-	if (!s)
-		err = -ENOSYS; /* Until __kmem_cache_create returns code */
+	n = kstrdup(name, GFP_KERNEL);
+	if (!n) {
+		err = -ENOMEM;
+		goto out_locked;
+	}
+
+	s = __kmem_cache_create(n, size, align, flags, ctor);
 
-	/*
-	 * Check if the slab has actually been created and if it was a
-	 * real instatiation. Aliases do not belong on the list
-	 */
-	if (s && s->refcount == 1)
-		list_add(&s->list, &slab_caches);
+	if (s) {
+		/*
+		 * Check if the slab has actually been created and if it was a
+		 * real instatiation. Aliases do not belong on the list
+		 */
+		if (s->refcount == 1)
+			list_add(&s->list, &slab_caches);
+
+	} else {
+		kfree(n);
+		err = -ENOSYS; /* Until __kmem_cache_create returns code */
+	}
 
 out_locked:
 	mutex_unlock(&slab_mutex);
@@ -153,6 +164,7 @@ void kmem_cache_destroy(struct kmem_cach
 			if (s->flags & SLAB_DESTROY_BY_RCU)
 				rcu_barrier();
 
+			kfree(s->name);
 			kmem_cache_free(kmem_cache, s);
 		} else {
 			list_add(&s->list, &slab_caches);
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.806081796 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:55.543622767 -0500
@@ -210,10 +210,7 @@ static void sysfs_slab_remove(struct kme
 static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
 static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
 							{ return 0; }
-static inline void sysfs_slab_remove(struct kmem_cache *s)
-{
-	kfree(s->name);
-}
+static inline void sysfs_slab_remove(struct kmem_cache *s) { }
 
 #endif
 
@@ -3929,7 +3926,6 @@ struct kmem_cache *__kmem_cache_create(c
 		size_t align, unsigned long flags, void (*ctor)(void *))
 {
 	struct kmem_cache *s;
-	char *n;
 
 	s = find_mergeable(size, align, flags, name, ctor);
 	if (s) {
@@ -3948,13 +3944,9 @@ struct kmem_cache *__kmem_cache_create(c
 		return s;
 	}
 
-	n = kstrdup(name, GFP_KERNEL);
-	if (!n)
-		return NULL;
-
 	s = kmem_cache_alloc(kmem_cache, GFP_KERNEL);
 	if (s) {
-		if (kmem_cache_open(s, n,
+		if (kmem_cache_open(s, name,
 				size, align, flags, ctor)) {
 			int r;
 
@@ -3969,7 +3961,6 @@ struct kmem_cache *__kmem_cache_create(c
 		}
 		kmem_cache_free(kmem_cache, s);
 	}
-	kfree(n);
 	return NULL;
 }
 
@@ -5200,13 +5191,6 @@ static ssize_t slab_attr_store(struct ko
 	return err;
 }
 
-static void kmem_cache_release(struct kobject *kobj)
-{
-	struct kmem_cache *s = to_slab(kobj);
-
-	kfree(s->name);
-}
-
 static const struct sysfs_ops slab_sysfs_ops = {
 	.show = slab_attr_show,
 	.store = slab_attr_store,
@@ -5214,7 +5198,6 @@ static const struct sysfs_ops slab_sysfs
 
 static struct kobj_type slab_ktype = {
 	.sysfs_ops = &slab_sysfs_ops,
-	.release = kmem_cache_release
 };
 
 static int uevent_filter(struct kset *kset, struct kobject *kobj)

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C14 [13/14] Shrink __kmem_cache_create() parameter lists

[Christoph Lameter]

Do the initial settings of the fields in common code. This will allow
us to push more processing into common code later and improve readability.

Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.c        |   91 ++++++++++++++++++++++++------------------------------
 mm/slab.h        |    3 +-
 mm/slab_common.c |   26 ++++++++--------
 mm/slob.c        |    8 ++---
 mm/slub.c        |   39 +++++++++++------------
 5 files changed, 76 insertions(+), 91 deletions(-)

Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c	2012-09-04 18:00:16.854082538 -0500
+++ linux/mm/slab.c	2012-09-04 18:01:51.863565333 -0500
@@ -1677,20 +1677,20 @@ void __init kmem_cache_init(void)
 	 */
 
 	sizes[INDEX_AC].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
-	__kmem_cache_create(sizes[INDEX_AC].cs_cachep, names[INDEX_AC].name,
-					sizes[INDEX_AC].cs_size,
-					ARCH_KMALLOC_MINALIGN,
-					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
-					NULL);
-
+	sizes[INDEX_AC].cs_cachep->name = names[INDEX_AC].name;
+	sizes[INDEX_AC].cs_cachep->size = sizes[INDEX_AC].cs_size;
+	sizes[INDEX_AC].cs_cachep->object_size = sizes[INDEX_AC].cs_size;
+	sizes[INDEX_AC].cs_cachep->align = ARCH_KMALLOC_MINALIGN;
+	__kmem_cache_create(sizes[INDEX_AC].cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC);
 	list_add(&sizes[INDEX_AC].cs_cachep->list, &slab_caches);
+
 	if (INDEX_AC != INDEX_L3) {
 		sizes[INDEX_L3].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
-		__kmem_cache_create(sizes[INDEX_L3].cs_cachep, names[INDEX_L3].name,
-				sizes[INDEX_L3].cs_size,
-				ARCH_KMALLOC_MINALIGN,
-				ARCH_KMALLOC_FLAGS|SLAB_PANIC,
-				NULL);
+		sizes[INDEX_L3].cs_cachep->name = names[INDEX_L3].name;
+		sizes[INDEX_L3].cs_cachep->size = sizes[INDEX_L3].cs_size;
+		sizes[INDEX_L3].cs_cachep->object_size = sizes[INDEX_L3].cs_size;
+		sizes[INDEX_L3].cs_cachep->align = ARCH_KMALLOC_MINALIGN;
+		__kmem_cache_create(sizes[INDEX_L3].cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC);
 		list_add(&sizes[INDEX_L3].cs_cachep->list, &slab_caches);
 	}
 
@@ -1706,22 +1706,21 @@ void __init kmem_cache_init(void)
 		 */
 		if (!sizes->cs_cachep) {
 			sizes->cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
-			__kmem_cache_create(sizes->cs_cachep, names->name,
-					sizes->cs_size,
-					ARCH_KMALLOC_MINALIGN,
-					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
-					NULL);
+			sizes->cs_cachep->name = names->name;
+			sizes->cs_cachep->size = sizes->cs_size;
+			sizes->cs_cachep->object_size = sizes->cs_size;
+			sizes->cs_cachep->align = ARCH_KMALLOC_MINALIGN;
+			__kmem_cache_create(sizes->cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC);
 			list_add(&sizes->cs_cachep->list, &slab_caches);
 		}
 #ifdef CONFIG_ZONE_DMA
 		sizes->cs_dmacachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+		sizes->cs_dmacachep->name = names->name_dma;
+		sizes->cs_dmacachep->size = sizes->cs_size;
+		sizes->cs_dmacachep->object_size = sizes->cs_size;
+		sizes->cs_dmacachep->align = ARCH_KMALLOC_MINALIGN;
 		__kmem_cache_create(sizes->cs_dmacachep,
-					names->name_dma,
-					sizes->cs_size,
-					ARCH_KMALLOC_MINALIGN,
-					ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA|
-						SLAB_PANIC,
-					NULL);
+			       ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| SLAB_PANIC);
 		list_add(&sizes->cs_dmacachep->list, &slab_caches);
 #endif
 		sizes++;
@@ -2360,12 +2359,12 @@ static int __init_refok setup_cpu_cache(
  * as davem.
  */
 int
-__kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, size_t align,
-	unsigned long flags, void (*ctor)(void *))
+__kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
 {
 	size_t left_over, slab_size, ralign;
 	gfp_t gfp;
 	int err;
+	size_t size = cachep->size;
 
 #if DEBUG
 #if FORCED_DEBUG
@@ -2437,8 +2436,8 @@ __kmem_cache_create (struct kmem_cache *
 		ralign = ARCH_SLAB_MINALIGN;
 	}
 	/* 3) caller mandated alignment */
-	if (ralign < align) {
-		ralign = align;
+	if (ralign < cachep->align) {
+		ralign = cachep->align;
 	}
 	/* disable debug if necessary */
 	if (ralign > __alignof__(unsigned long long))
@@ -2446,7 +2445,7 @@ __kmem_cache_create (struct kmem_cache *
 	/*
 	 * 4) Store it.
 	 */
-	align = ralign;
+	cachep->align = ralign;
 
 	if (slab_is_available())
 		gfp = GFP_KERNEL;
@@ -2454,8 +2453,6 @@ __kmem_cache_create (struct kmem_cache *
 		gfp = GFP_NOWAIT;
 
 	cachep->nodelists = (struct kmem_list3 **)&cachep->array[nr_cpu_ids];
-	cachep->object_size = size;
-	cachep->align = align;
 #if DEBUG
 
 	/*
@@ -2500,17 +2497,15 @@ __kmem_cache_create (struct kmem_cache *
 		 */
 		flags |= CFLGS_OFF_SLAB;
 
-	size = ALIGN(size, align);
+	size = ALIGN(size, cachep->align);
 
-	left_over = calculate_slab_order(cachep, size, align, flags);
+	left_over = calculate_slab_order(cachep, size, cachep->align, flags);
 
-	if (!cachep->num) {
-		printk(KERN_ERR
-		       "kmem_cache_create: couldn't create cache %s.\n", name);
+	if (!cachep->num)
 		return -E2BIG;
-	}
+
 	slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t)
-			  + sizeof(struct slab), align);
+			  + sizeof(struct slab), cachep->align);
 
 	/*
 	 * If the slab has been placed off-slab, and we have enough space then
@@ -2538,8 +2533,8 @@ __kmem_cache_create (struct kmem_cache *
 
 	cachep->colour_off = cache_line_size();
 	/* Offset must be a multiple of the alignment. */
-	if (cachep->colour_off < align)
-		cachep->colour_off = align;
+	if (cachep->colour_off < cachep->align)
+		cachep->colour_off = cachep->align;
 	cachep->colour = left_over / cachep->colour_off;
 	cachep->slab_size = slab_size;
 	cachep->flags = flags;
@@ -2560,8 +2555,6 @@ __kmem_cache_create (struct kmem_cache *
 		 */
 		BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache));
 	}
-	cachep->ctor = ctor;
-	cachep->name = name;
 	cachep->refcount = 1;
 
 	err = setup_cpu_cache(cachep, gfp);
Index: linux/mm/slab.h
===================================================================
--- linux.orig/mm/slab.h	2012-09-04 18:00:16.854082538 -0500
+++ linux/mm/slab.h	2012-09-04 18:00:16.870082786 -0500
@@ -33,8 +33,7 @@ extern struct list_head slab_caches;
 extern struct kmem_cache *kmem_cache;
 
 /* Functions provided by the slab allocators */
-extern int __kmem_cache_create(struct kmem_cache *, const char *name,
-	size_t size, size_t align, unsigned long flags, void (*ctor)(void *));
+extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
 
 #ifdef CONFIG_SLUB
 struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.854082538 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:51.883565645 -0500
@@ -100,7 +100,6 @@ struct kmem_cache *kmem_cache_create(con
 {
 	struct kmem_cache *s = NULL;
 	int err = 0;
-	char *n;
 
 	get_online_cpus();
 	mutex_lock(&slab_mutex);
@@ -109,32 +108,33 @@ struct kmem_cache *kmem_cache_create(con
 		goto out_locked;
 
 
-	n = kstrdup(name, GFP_KERNEL);
-	if (!n) {
-		err = -ENOMEM;
-		goto out_locked;
-	}
-
 	s = __kmem_cache_alias(name, size, align, flags, ctor);
 	if (s)
 		goto out_locked;
 
 	s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL);
 	if (s) {
-		err = __kmem_cache_create(s, n, size, align, flags, ctor);
+		s->object_size = s->size = size;
+		s->align = align;
+		s->ctor = ctor;
+		s->name = kstrdup(name, GFP_KERNEL);
+		if (!s->name) {
+			kmem_cache_free(kmem_cache, s);
+			err = -ENOMEM;
+			goto out_locked;
+		}
+
+		err = __kmem_cache_create(s, flags);
 		if (!err)
 
 			list_add(&s->list, &slab_caches);
 
 		else {
-			kfree(n);
+			kfree(s->name);
 			kmem_cache_free(kmem_cache, s);
 		}
-
-	} else {
-		kfree(n);
+	} else
 		err = -ENOMEM;
-	}
 
 out_locked:
 	mutex_unlock(&slab_mutex);
Index: linux/mm/slob.c
===================================================================
--- linux.orig/mm/slob.c	2012-09-04 18:00:16.854082538 -0500
+++ linux/mm/slob.c	2012-09-04 18:01:51.875565516 -0500
@@ -508,17 +508,15 @@ size_t ksize(const void *block)
 }
 EXPORT_SYMBOL(ksize);
 
-int __kmem_cache_create(struct kmem_cache *c, const char *name, size_t size,
-	size_t align, unsigned long flags, void (*ctor)(void *))
+int __kmem_cache_create(struct kmem_cache *c, unsigned long flags)
 {
-	c->name = name;
-	c->size = size;
+	size_t align = c->size;
+
 	if (flags & SLAB_DESTROY_BY_RCU) {
 		/* leave room for rcu footer at the end of object */
 		c->size += sizeof(struct slob_rcu);
 	}
 	c->flags = flags;
-	c->ctor = ctor;
 	/* ignore alignment unless it's forced */
 	c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0;
 	if (c->align < ARCH_SLAB_MINALIGN)
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.858082603 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:51.895565828 -0500
@@ -3029,16 +3029,9 @@ static int calculate_sizes(struct kmem_c
 
 }
 
-static int kmem_cache_open(struct kmem_cache *s,
-		const char *name, size_t size,
-		size_t align, unsigned long flags,
-		void (*ctor)(void *))
+static int kmem_cache_open(struct kmem_cache *s, unsigned long flags)
 {
-	s->name = name;
-	s->ctor = ctor;
-	s->object_size = size;
-	s->align = align;
-	s->flags = kmem_cache_flags(size, flags, name, ctor);
+	s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor);
 	s->reserved = 0;
 
 	if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU))
@@ -3115,7 +3108,7 @@ error:
 	if (flags & SLAB_PANIC)
 		panic("Cannot create slab %s size=%lu realsize=%u "
 			"order=%u offset=%u flags=%lx\n",
-			s->name, (unsigned long)size, s->size, oo_order(s->oo),
+			s->name, (unsigned long)s->size, s->size, oo_order(s->oo),
 			s->offset, flags);
 	return -EINVAL;
 }
@@ -3261,12 +3254,15 @@ static struct kmem_cache *__init create_
 
 	s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
 
+	s->name = name;
+	s->size = s->object_size = size;
+	s->align = ARCH_KMALLOC_MINALIGN;
+
 	/*
 	 * This function is called with IRQs disabled during early-boot on
 	 * single CPU so there's no need to take slab_mutex here.
 	 */
-	if (kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN,
-								flags, NULL))
+	if (kmem_cache_open(s, flags))
 		goto panic;
 
 	list_add(&s->list, &slab_caches);
@@ -3719,9 +3715,10 @@ void __init kmem_cache_init(void)
 	 */
 	kmem_cache_node = (void *)kmem_cache + kmalloc_size;
 
-	kmem_cache_open(kmem_cache_node, "kmem_cache_node",
-		sizeof(struct kmem_cache_node),
-		0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+	kmem_cache_node->name = "kmem_cache_node";
+	kmem_cache_node->size = kmem_cache_node->object_size =
+		sizeof(struct kmem_cache_node);
+	kmem_cache_open(kmem_cache_node, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
 
 	hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
 
@@ -3729,8 +3726,10 @@ void __init kmem_cache_init(void)
 	slab_state = PARTIAL;
 
 	temp_kmem_cache = kmem_cache;
-	kmem_cache_open(kmem_cache, "kmem_cache", kmem_size,
-		0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+	kmem_cache->name = "kmem_cache";
+	kmem_cache->size = kmem_cache->object_size = kmem_size;
+	kmem_cache_open(kmem_cache, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
+
 	kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
 	memcpy(kmem_cache, temp_kmem_cache, kmem_size);
 
@@ -3943,11 +3942,9 @@ struct kmem_cache *__kmem_cache_alias(co
 	return s;
 }
 
-int __kmem_cache_create(struct kmem_cache *s,
-		const char *name, size_t size,
-		size_t align, unsigned long flags, void (*ctor)(void *))
+int __kmem_cache_create(struct kmem_cache *s, unsigned long flags)
 {
-	return kmem_cache_open(s, name, size, align, flags, ctor);
+	return kmem_cache_open(s, flags);
 }
 
 #ifdef CONFIG_SMP

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C14 [05/14] Extract a common function for kmem_cache_destroy

[Christoph Lameter]

kmem_cache_destroy does basically the same in all allocators.

Extract common code which is easy since we already have common mutex handling.

V1-V2:
	- Move percpu freeing to later so that we fail cleaner if
		objects are left in the cache [JoonSoo Kim]

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.c        |   55 +++---------------------------------------------------
 mm/slab.h        |    3 +++
 mm/slab_common.c |   25 +++++++++++++++++++++++++
 mm/slob.c        |   15 +++++++--------
 mm/slub.c        |   36 +++++++++++------------------------
 5 files changed, 49 insertions(+), 85 deletions(-)

Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c	2012-09-04 18:00:16.746080846 -0500
+++ linux/mm/slab.c	2012-09-04 18:01:58.303665841 -0500
@@ -2206,7 +2206,7 @@ static void slab_destroy(struct kmem_cac
 	}
 }
 
-static void __kmem_cache_destroy(struct kmem_cache *cachep)
+void __kmem_cache_destroy(struct kmem_cache *cachep)
 {
 	int i;
 	struct kmem_list3 *l3;
@@ -2763,49 +2763,10 @@ int kmem_cache_shrink(struct kmem_cache
 }
 EXPORT_SYMBOL(kmem_cache_shrink);
 
-/**
- * kmem_cache_destroy - delete a cache
- * @cachep: the cache to destroy
- *
- * Remove a &struct kmem_cache object from the slab cache.
- *
- * It is expected this function will be called by a module when it is
- * unloaded.  This will remove the cache completely, and avoid a duplicate
- * cache being allocated each time a module is loaded and unloaded, if the
- * module doesn't have persistent in-kernel storage across loads and unloads.
- *
- * The cache must be empty before calling this function.
- *
- * The caller must guarantee that no one will allocate memory from the cache
- * during the kmem_cache_destroy().
- */
-void kmem_cache_destroy(struct kmem_cache *cachep)
+int __kmem_cache_shutdown(struct kmem_cache *cachep)
 {
-	BUG_ON(!cachep || in_interrupt());
-
-	/* Find the cache in the chain of caches. */
-	get_online_cpus();
-	mutex_lock(&slab_mutex);
-	/*
-	 * the chain is never empty, cache_cache is never destroyed
-	 */
-	list_del(&cachep->list);
-	if (__cache_shrink(cachep)) {
-		slab_error(cachep, "Can't free all objects");
-		list_add(&cachep->list, &slab_caches);
-		mutex_unlock(&slab_mutex);
-		put_online_cpus();
-		return;
-	}
-
-	if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU))
-		rcu_barrier();
-
-	__kmem_cache_destroy(cachep);
-	mutex_unlock(&slab_mutex);
-	put_online_cpus();
+	return __cache_shrink(cachep);
 }
-EXPORT_SYMBOL(kmem_cache_destroy);
 
 /*
  * Get the memory for a slab management obj.
Index: linux/mm/slab.h
===================================================================
--- linux.orig/mm/slab.h	2012-09-04 17:57:07.447126505 -0500
+++ linux/mm/slab.h	2012-09-04 18:01:58.295665715 -0500
@@ -30,4 +30,7 @@ extern struct list_head slab_caches;
 struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *));
 
+int __kmem_cache_shutdown(struct kmem_cache *);
+void __kmem_cache_destroy(struct kmem_cache *);
+
 #endif
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.746080846 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:58.323666153 -0500
@@ -140,6 +140,31 @@ out_locked:
 }
 EXPORT_SYMBOL(kmem_cache_create);
 
+void kmem_cache_destroy(struct kmem_cache *s)
+{
+	get_online_cpus();
+	mutex_lock(&slab_mutex);
+	s->refcount--;
+	if (!s->refcount) {
+		list_del(&s->list);
+
+		if (!__kmem_cache_shutdown(s)) {
+			if (s->flags & SLAB_DESTROY_BY_RCU)
+				rcu_barrier();
+
+			__kmem_cache_destroy(s);
+		} else {
+			list_add(&s->list, &slab_caches);
+			printk(KERN_ERR "kmem_cache_destroy %s: Slab cache still has objects\n",
+				s->name);
+			dump_stack();
+		}
+	}
+	mutex_unlock(&slab_mutex);
+	put_online_cpus();
+}
+EXPORT_SYMBOL(kmem_cache_destroy);
+
 int slab_is_available(void)
 {
 	return slab_state >= UP;
Index: linux/mm/slob.c
===================================================================
--- linux.orig/mm/slob.c	2012-09-04 18:00:16.746080846 -0500
+++ linux/mm/slob.c	2012-09-04 18:01:58.315666027 -0500
@@ -538,18 +538,11 @@ struct kmem_cache *__kmem_cache_create(c
 	return c;
 }
 
-void kmem_cache_destroy(struct kmem_cache *c)
+void __kmem_cache_destroy(struct kmem_cache *c)
 {
-	mutex_lock(&slab_mutex);
-	list_del(&c->list);
-	mutex_unlock(&slab_mutex);
-
 	kmemleak_free(c);
-	if (c->flags & SLAB_DESTROY_BY_RCU)
-		rcu_barrier();
 	slob_free(c, sizeof(struct kmem_cache));
 }
-EXPORT_SYMBOL(kmem_cache_destroy);
 
 void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
 {
@@ -617,6 +610,12 @@ unsigned int kmem_cache_size(struct kmem
 }
 EXPORT_SYMBOL(kmem_cache_size);
 
+int __kmem_cache_shutdown(struct kmem_cache *c)
+{
+	/* No way to check for remaining objects */
+	return 0;
+}
+
 int kmem_cache_shrink(struct kmem_cache *d)
 {
 	return 0;
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.750080900 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:58.335666339 -0500
@@ -624,7 +624,7 @@ static void object_err(struct kmem_cache
 	print_trailer(s, page, object);
 }
 
-static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...)
+static void slab_err(struct kmem_cache *s, struct page *page, const char *fmt, ...)
 {
 	va_list args;
 	char buf[100];
@@ -3146,7 +3146,7 @@ static void list_slab_objects(struct kme
 				     sizeof(long), GFP_ATOMIC);
 	if (!map)
 		return;
-	slab_err(s, page, "%s", text);
+	slab_err(s, page, text, s->name);
 	slab_lock(page);
 
 	get_map(s, page, map);
@@ -3178,7 +3178,7 @@ static void free_partial(struct kmem_cac
 			discard_slab(s, page);
 		} else {
 			list_slab_objects(s, page,
-				"Objects remaining on kmem_cache_close()");
+			"Objects remaining in %s on kmem_cache_close()");
 		}
 	}
 }
@@ -3191,7 +3191,6 @@ static inline int kmem_cache_close(struc
 	int node;
 
 	flush_all(s);
-	free_percpu(s->cpu_slab);
 	/* Attempt to free all objects */
 	for_each_node_state(node, N_NORMAL_MEMORY) {
 		struct kmem_cache_node *n = get_node(s, node);
@@ -3200,33 +3199,20 @@ static inline int kmem_cache_close(struc
 		if (n->nr_partial || slabs_node(s, node))
 			return 1;
 	}
+	free_percpu(s->cpu_slab);
 	free_kmem_cache_nodes(s);
 	return 0;
 }
 
-/*
- * Close a cache and release the kmem_cache structure
- * (must be used for caches created using kmem_cache_create)
- */
-void kmem_cache_destroy(struct kmem_cache *s)
+int __kmem_cache_shutdown(struct kmem_cache *s)
 {
-	mutex_lock(&slab_mutex);
-	s->refcount--;
-	if (!s->refcount) {
-		list_del(&s->list);
-		mutex_unlock(&slab_mutex);
-		if (kmem_cache_close(s)) {
-			printk(KERN_ERR "SLUB %s: %s called for cache that "
-				"still has objects.\n", s->name, __func__);
-			dump_stack();
-		}
-		if (s->flags & SLAB_DESTROY_BY_RCU)
-			rcu_barrier();
-		sysfs_slab_remove(s);
-	} else
-		mutex_unlock(&slab_mutex);
+	return kmem_cache_close(s);
+}
+
+void __kmem_cache_destroy(struct kmem_cache *s)
+{
+	sysfs_slab_remove(s);
 }
-EXPORT_SYMBOL(kmem_cache_destroy);
 
 /********************************************************************
  *		Kmalloc subsystem

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C14 [14/14] [PATCH 23/28] Move kmem_cache refcounting to common code

[Christoph Lameter]

Get rid of the refcount stuff in the allocators and do that
part of kmem_cache management in the common code.

Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.c        |    1 -
 mm/slab_common.c |    5 +++--
 mm/slob.c        |    2 --
 mm/slub.c        |    1 -
 4 files changed, 3 insertions(+), 6 deletions(-)

Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c	2012-09-04 18:00:16.870082786 -0500
+++ linux/mm/slab.c	2012-09-04 18:00:16.882082975 -0500
@@ -2555,7 +2555,6 @@ __kmem_cache_create (struct kmem_cache *
 		 */
 		BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache));
 	}
-	cachep->refcount = 1;
 
 	err = setup_cpu_cache(cachep, gfp);
 	if (err) {
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.870082786 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:00:16.886083040 -0500
@@ -125,11 +125,12 @@ struct kmem_cache *kmem_cache_create(con
 		}
 
 		err = __kmem_cache_create(s, flags);
-		if (!err)
+		if (!err) {
 
+			s->refcount = 1;
 			list_add(&s->list, &slab_caches);
 
-		else {
+		} else {
 			kfree(s->name);
 			kmem_cache_free(kmem_cache, s);
 		}
Index: linux/mm/slob.c
===================================================================
--- linux.orig/mm/slob.c	2012-09-04 18:00:16.870082786 -0500
+++ linux/mm/slob.c	2012-09-04 18:00:16.886083040 -0500
@@ -524,7 +524,6 @@ int __kmem_cache_create(struct kmem_cach
 	if (c->align < align)
 		c->align = align;
 
-	c->refcount = 1;
 	return 0;
 }
 
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.870082786 -0500
+++ linux/mm/slub.c	2012-09-04 18:00:16.886083040 -0500
@@ -3093,7 +3093,6 @@ static int kmem_cache_open(struct kmem_c
 	else
 		s->cpu_partial = 30;
 
-	s->refcount = 1;
 #ifdef CONFIG_NUMA
 	s->remote_node_defrag_ratio = 1000;
 #endif

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C14 [08/14] Get rid of __kmem_cache_destroy

[Christoph Lameter]

What is done there can be done in __kmem_cache_shutdown.

This affects RCU handling somewhat. On rcu free all slab allocators
do not refer to other management structures than the kmem_cache structure.
Therefore these other structures can be freed before the rcu deferred
free to the page allocator occurs.

Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.c        |   46 +++++++++++++++++++++-------------------------
 mm/slab.h        |    1 -
 mm/slab_common.c |    1 -
 mm/slob.c        |    4 ----
 mm/slub.c        |   10 +++++-----
 5 files changed, 26 insertions(+), 36 deletions(-)

Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c	2012-09-04 18:00:16.790081538 -0500
+++ linux/mm/slab.c	2012-09-04 18:01:54.239602415 -0500
@@ -2208,26 +2208,6 @@ static void slab_destroy(struct kmem_cac
 	}
 }
 
-void __kmem_cache_destroy(struct kmem_cache *cachep)
-{
-	int i;
-	struct kmem_list3 *l3;
-
-	for_each_online_cpu(i)
-	    kfree(cachep->array[i]);
-
-	/* NUMA: free the list3 structures */
-	for_each_online_node(i) {
-		l3 = cachep->nodelists[i];
-		if (l3) {
-			kfree(l3->shared);
-			free_alien_cache(l3->alien);
-			kfree(l3);
-		}
-	}
-}
-
-
 /**
  * calculate_slab_order - calculate size (page order) of slabs
  * @cachep: pointer to the cache that is being created
@@ -2364,9 +2344,6 @@ static int __init_refok setup_cpu_cache(
  * Cannot be called within a int, but can be interrupted.
  * The @ctor is run when new pages are allocated by the cache.
  *
- * @name must be valid until the cache is destroyed. This implies that
- * the module calling this has to destroy the cache before getting unloaded.
- *
  * The flags are
  *
  * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
@@ -2591,7 +2568,7 @@ __kmem_cache_create (const char *name, s
 	cachep->refcount = 1;
 
 	if (setup_cpu_cache(cachep, gfp)) {
-		__kmem_cache_destroy(cachep);
+		__kmem_cache_shutdown(cachep);
 		return NULL;
 	}
 
@@ -2766,7 +2743,26 @@ EXPORT_SYMBOL(kmem_cache_shrink);
 
 int __kmem_cache_shutdown(struct kmem_cache *cachep)
 {
-	return __cache_shrink(cachep);
+	int i;
+	struct kmem_list3 *l3;
+	int rc = __cache_shrink(cachep);
+
+	if (rc)
+		return rc;
+
+	for_each_online_cpu(i)
+	    kfree(cachep->array[i]);
+
+	/* NUMA: free the list3 structures */
+	for_each_online_node(i) {
+		l3 = cachep->nodelists[i];
+		if (l3) {
+			kfree(l3->shared);
+			free_alien_cache(l3->alien);
+			kfree(l3);
+		}
+	}
+	return 0;
 }
 
 /*
Index: linux/mm/slab.h
===================================================================
--- linux.orig/mm/slab.h	2012-09-04 18:00:16.774081296 -0500
+++ linux/mm/slab.h	2012-09-04 18:01:55.523622455 -0500
@@ -37,6 +37,5 @@ struct kmem_cache *__kmem_cache_create(c
 	size_t align, unsigned long flags, void (*ctor)(void *));
 
 int __kmem_cache_shutdown(struct kmem_cache *);
-void __kmem_cache_destroy(struct kmem_cache *);
 
 #endif
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.790081538 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:56.147632189 -0500
@@ -153,7 +153,6 @@ void kmem_cache_destroy(struct kmem_cach
 			if (s->flags & SLAB_DESTROY_BY_RCU)
 				rcu_barrier();
 
-			__kmem_cache_destroy(s);
 			kmem_cache_free(kmem_cache, s);
 		} else {
 			list_add(&s->list, &slab_caches);
Index: linux/mm/slob.c
===================================================================
--- linux.orig/mm/slob.c	2012-09-04 18:00:16.790081538 -0500
+++ linux/mm/slob.c	2012-09-04 18:01:54.247602537 -0500
@@ -538,10 +538,6 @@ struct kmem_cache *__kmem_cache_create(c
 	return c;
 }
 
-void __kmem_cache_destroy(struct kmem_cache *c)
-{
-}
-
 void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
 {
 	void *b;
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.790081538 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:56.159632381 -0500
@@ -3205,12 +3205,12 @@ static inline int kmem_cache_close(struc
 
 int __kmem_cache_shutdown(struct kmem_cache *s)
 {
-	return kmem_cache_close(s);
-}
+	int rc = kmem_cache_close(s);
 
-void __kmem_cache_destroy(struct kmem_cache *s)
-{
-	sysfs_slab_remove(s);
+	if (!rc)
+		sysfs_slab_remove(s);
+
+	return rc;
 }
 
 /********************************************************************

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C14 [04/14] Move list_add() to slab_common.c

[Christoph Lameter]

Move the code to append the new kmem_cache to the list of slab caches to
the kmem_cache_create code in the shared code.

This is possible now since the acquisition of the mutex was moved into
kmem_cache_create().

V1->V2:
	- SLOB: Add code to remove the slab from list
	 (will be removed a couple of patches down when we also move the
	 list_del to common code).

Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.c        |    7 +++++--
 mm/slab_common.c |    7 +++++++
 mm/slob.c        |    4 ++++
 mm/slub.c        |    2 --
 4 files changed, 16 insertions(+), 4 deletions(-)

Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c	2012-09-04 18:00:13.010022624 -0500
+++ linux/mm/slab.c	2012-09-04 18:01:58.979676391 -0500
@@ -1680,6 +1680,7 @@ void __init kmem_cache_init(void)
 					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
 					NULL);
 
+	list_add(&sizes[INDEX_AC].cs_cachep->list, &slab_caches);
 	if (INDEX_AC != INDEX_L3) {
 		sizes[INDEX_L3].cs_cachep =
 			__kmem_cache_create(names[INDEX_L3].name,
@@ -1687,6 +1688,7 @@ void __init kmem_cache_init(void)
 				ARCH_KMALLOC_MINALIGN,
 				ARCH_KMALLOC_FLAGS|SLAB_PANIC,
 				NULL);
+		list_add(&sizes[INDEX_L3].cs_cachep->list, &slab_caches);
 	}
 
 	slab_early_init = 0;
@@ -1705,6 +1707,7 @@ void __init kmem_cache_init(void)
 					ARCH_KMALLOC_MINALIGN,
 					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
 					NULL);
+			list_add(&sizes->cs_cachep->list, &slab_caches);
 		}
 #ifdef CONFIG_ZONE_DMA
 		sizes->cs_dmacachep = __kmem_cache_create(
@@ -1714,6 +1717,7 @@ void __init kmem_cache_init(void)
 					ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA|
 						SLAB_PANIC,
 					NULL);
+		list_add(&sizes->cs_dmacachep->list, &slab_caches);
 #endif
 		sizes++;
 		names++;
@@ -2583,6 +2587,7 @@ __kmem_cache_create (const char *name, s
 	}
 	cachep->ctor = ctor;
 	cachep->name = name;
+	cachep->refcount = 1;
 
 	if (setup_cpu_cache(cachep, gfp)) {
 		__kmem_cache_destroy(cachep);
@@ -2599,8 +2604,6 @@ __kmem_cache_create (const char *name, s
 		slab_set_debugobj_lock_classes(cachep);
 	}
 
-	/* cache setup completed, link it into the list */
-	list_add(&cachep->list, &slab_caches);
 	return cachep;
 }
 
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.734080689 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:58.999676703 -0500
@@ -111,6 +111,13 @@ struct kmem_cache *kmem_cache_create(con
 	if (!s)
 		err = -ENOSYS; /* Until __kmem_cache_create returns code */
 
+	/*
+	 * Check if the slab has actually been created and if it was a
+	 * real instatiation. Aliases do not belong on the list
+	 */
+	if (s && s->refcount == 1)
+		list_add(&s->list, &slab_caches);
+
 out_locked:
 	mutex_unlock(&slab_mutex);
 	put_online_cpus();
Index: linux/mm/slob.c
===================================================================
--- linux.orig/mm/slob.c	2012-09-04 18:00:13.018022700 -0500
+++ linux/mm/slob.c	2012-09-04 18:01:58.991676576 -0500
@@ -540,6 +540,10 @@ struct kmem_cache *__kmem_cache_create(c
 
 void kmem_cache_destroy(struct kmem_cache *c)
 {
+	mutex_lock(&slab_mutex);
+	list_del(&c->list);
+	mutex_unlock(&slab_mutex);
+
 	kmemleak_free(c);
 	if (c->flags & SLAB_DESTROY_BY_RCU)
 		rcu_barrier();
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.722080462 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:59.011676888 -0500
@@ -3975,7 +3975,6 @@ struct kmem_cache *__kmem_cache_create(c
 				size, align, flags, ctor)) {
 			int r;
 
-			list_add(&s->list, &slab_caches);
 			mutex_unlock(&slab_mutex);
 			r = sysfs_slab_add(s);
 			mutex_lock(&slab_mutex);
@@ -3983,7 +3982,6 @@ struct kmem_cache *__kmem_cache_create(c
 			if (!r)
 				return s;
 
-			list_del(&s->list);
 			kmem_cache_close(s);
 		}
 		kmem_cache_free(kmem_cache, s);

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C14 [11/14] Move sysfs_slab_add to common

[Christoph Lameter]

Simplify locking by moving the slab_add_sysfs after all locks
have been dropped. Eases the upcoming move to provide sysfs
support for all allocators.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.h        |    3 +++
 mm/slab_common.c |    8 ++++++++
 mm/slub.c        |   15 ++-------------
 3 files changed, 13 insertions(+), 13 deletions(-)

Index: linux/mm/slab.h
===================================================================
--- linux.orig/mm/slab.h	2012-09-04 18:00:16.830082166 -0500
+++ linux/mm/slab.h	2012-09-04 18:01:54.227602225 -0500
@@ -39,10 +39,13 @@ struct kmem_cache *__kmem_cache_create(c
 #ifdef CONFIG_SLUB
 struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *));
+extern int sysfs_slab_add(struct kmem_cache *s);
 #else
 static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *))
 { return NULL; }
+static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
+
 #endif
 
 
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.830082166 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:54.255602662 -0500
@@ -152,6 +152,14 @@ out_locked:
 		return NULL;
 	}
 
+	if (s->refcount == 1) {
+		err = sysfs_slab_add(s);
+		if (err)
+			printk(KERN_WARNING "kmem_cache_create(%s) failed to"
+				" create sysfs entry. Error %d\n",
+					name, err);
+	}
+
 	return s;
 }
 EXPORT_SYMBOL(kmem_cache_create);
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.830082166 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:54.267602849 -0500
@@ -202,12 +202,10 @@ struct track {
 enum track_item { TRACK_ALLOC, TRACK_FREE };
 
 #ifdef CONFIG_SYSFS
-static int sysfs_slab_add(struct kmem_cache *);
 static int sysfs_slab_alias(struct kmem_cache *, const char *);
 static void sysfs_slab_remove(struct kmem_cache *);
 
 #else
-static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
 static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
 							{ return 0; }
 static inline void sysfs_slab_remove(struct kmem_cache *s) { }
@@ -3955,16 +3953,7 @@ struct kmem_cache *__kmem_cache_create(c
 	if (s) {
 		if (kmem_cache_open(s, name,
 				size, align, flags, ctor)) {
-			int r;
-
-			mutex_unlock(&slab_mutex);
-			r = sysfs_slab_add(s);
-			mutex_lock(&slab_mutex);
-
-			if (!r)
-				return s;
-
-			kmem_cache_close(s);
+			return s;
 		}
 		kmem_cache_free(kmem_cache, s);
 	}
@@ -5258,7 +5247,7 @@ static char *create_unique_id(struct kme
 	return name;
 }
 
-static int sysfs_slab_add(struct kmem_cache *s)
+int sysfs_slab_add(struct kmem_cache *s)
 {
 	int err;
 	const char *name;

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C14 [07/14] Move freeing of kmem_cache structure to common code

[Christoph Lameter]

The freeing action is basically the same in all slab allocators.
Move to the common kmem_cache_destroy() function.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.c        |    1 -
 mm/slab_common.c |    1 +
 mm/slob.c        |    2 --
 mm/slub.c        |    2 --
 4 files changed, 1 insertion(+), 5 deletions(-)

Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c	2012-09-04 18:00:16.774081296 -0500
+++ linux/mm/slab.c	2012-09-04 18:01:56.855643242 -0500
@@ -2225,7 +2225,6 @@ void __kmem_cache_destroy(struct kmem_ca
 			kfree(l3);
 		}
 	}
-	kmem_cache_free(kmem_cache, cachep);
 }
 
 
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.774081296 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:56.871643489 -0500
@@ -154,6 +154,7 @@ void kmem_cache_destroy(struct kmem_cach
 				rcu_barrier();
 
 			__kmem_cache_destroy(s);
+			kmem_cache_free(kmem_cache, s);
 		} else {
 			list_add(&s->list, &slab_caches);
 			printk(KERN_ERR "kmem_cache_destroy %s: Slab cache still has objects\n",
Index: linux/mm/slob.c
===================================================================
--- linux.orig/mm/slob.c	2012-09-04 18:00:16.774081296 -0500
+++ linux/mm/slob.c	2012-09-04 18:01:56.863643366 -0500
@@ -540,8 +540,6 @@ struct kmem_cache *__kmem_cache_create(c
 
 void __kmem_cache_destroy(struct kmem_cache *c)
 {
-	kmemleak_free(c);
-	slob_free(c, sizeof(struct kmem_cache));
 }
 
 void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.778081353 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:56.883643678 -0500
@@ -213,7 +213,6 @@ static inline int sysfs_slab_alias(struc
 static inline void sysfs_slab_remove(struct kmem_cache *s)
 {
 	kfree(s->name);
-	kmem_cache_free(kmem_cache, s);
 }
 
 #endif
@@ -5206,7 +5205,6 @@ static void kmem_cache_release(struct ko
 	struct kmem_cache *s = to_slab(kobj);
 
 	kfree(s->name);
-	kmem_cache_free(kmem_cache, s);
 }
 
 static const struct sysfs_ops slab_sysfs_ops = {

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C14 [10/14] Do slab aliasing call from common code

[Christoph Lameter]

The slab aliasing logic causes some strange contortions in
slub. So add a call to deal with aliases to slab_common.c
but disable it for other slab allocators by providng stubs
that fail to create aliases.

Full general support for aliases will require additional
cleanup passes and more standardization of fields in
kmem_cache.

V1->V2:
	- Move kstrdup before kmem_cache_alias invocation.
	(JoonSoo Kim)

Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.h        |   10 ++++++++++
 mm/slab_common.c |    4 ++++
 mm/slub.c        |   15 +++++++++++----
 3 files changed, 25 insertions(+), 4 deletions(-)

Index: linux/mm/slab.h
===================================================================
--- linux.orig/mm/slab.h	2012-09-04 18:00:16.802081734 -0500
+++ linux/mm/slab.h	2012-09-04 18:01:54.947613462 -0500
@@ -36,6 +36,16 @@ extern struct kmem_cache *kmem_cache;
 struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *));
 
+#ifdef CONFIG_SLUB
+struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
+	size_t align, unsigned long flags, void (*ctor)(void *));
+#else
+static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
+	size_t align, unsigned long flags, void (*ctor)(void *))
+{ return NULL; }
+#endif
+
+
 int __kmem_cache_shutdown(struct kmem_cache *);
 
 #endif
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.814081912 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:54.959613652 -0500
@@ -115,6 +115,10 @@ struct kmem_cache *kmem_cache_create(con
 		goto out_locked;
 	}
 
+	s = __kmem_cache_alias(name, size, align, flags, ctor);
+	if (s)
+		goto out_locked;
+
 	s = __kmem_cache_create(n, size, align, flags, ctor);
 
 	if (s) {
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.818081972 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:54.971613835 -0500
@@ -3708,7 +3708,7 @@ void __init kmem_cache_init(void)
 		slub_max_order = 0;
 
 	kmem_size = offsetof(struct kmem_cache, node) +
-				nr_node_ids * sizeof(struct kmem_cache_node *);
+			nr_node_ids * sizeof(struct kmem_cache_node *);
 
 	/* Allocate two kmem_caches from the page allocator */
 	kmalloc_size = ALIGN(kmem_size, cache_line_size());
@@ -3922,7 +3922,7 @@ static struct kmem_cache *find_mergeable
 	return NULL;
 }
 
-struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
+struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
 		size_t align, unsigned long flags, void (*ctor)(void *))
 {
 	struct kmem_cache *s;
@@ -3939,11 +3939,18 @@ struct kmem_cache *__kmem_cache_create(c
 
 		if (sysfs_slab_alias(s, name)) {
 			s->refcount--;
-			return NULL;
+			s = NULL;
 		}
-		return s;
 	}
 
+	return s;
+}
+
+struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
+		size_t align, unsigned long flags, void (*ctor)(void *))
+{
+	struct kmem_cache *s;
+
 	s = kmem_cache_alloc(kmem_cache, GFP_KERNEL);
 	if (s) {
 		if (kmem_cache_open(s, name,

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C14 [03/14] Improve error handling in kmem_cache_create

[Christoph Lameter]

Instead of using s == NULL use an errorcode. This allows much more
detailed diagnostics as to what went wrong. As we add more functionality
from the slab allocators to the common kmem_cache_create() function we will
also add more error conditions.

Print the error code during the panic as well as in a warning if the module
can handle failure. The API for kmem_cache_create() currently does not allow
the returning of an error code. Return NULL but log the cause of the problem
in the syslog.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab_common.c |   30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:13.098023913 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:59.755688501 -0500
@@ -98,16 +98,36 @@ struct kmem_cache *kmem_cache_create(con
 		unsigned long flags, void (*ctor)(void *))
 {
 	struct kmem_cache *s = NULL;
+	int err = 0;
 
 	get_online_cpus();
 	mutex_lock(&slab_mutex);
-	if (kmem_cache_sanity_check(name, size) == 0)
-		s = __kmem_cache_create(name, size, align, flags, ctor);
+
+	if (!kmem_cache_sanity_check(name, size) == 0)
+		goto out_locked;
+
+
+	s = __kmem_cache_create(name, size, align, flags, ctor);
+	if (!s)
+		err = -ENOSYS; /* Until __kmem_cache_create returns code */
+
+out_locked:
 	mutex_unlock(&slab_mutex);
 	put_online_cpus();
 
-	if (!s && (flags & SLAB_PANIC))
-		panic("kmem_cache_create: Failed to create slab '%s'\n", name);
+	if (err) {
+
+		if (flags & SLAB_PANIC)
+			panic("kmem_cache_create: Failed to create slab '%s'. Error %d\n",
+				name, err);
+		else {
+			printk(KERN_WARNING "kmem_cache_create(%s) failed with error %d",
+				name, err);
+			dump_stack();
+		}
+
+		return NULL;
+	}
 
 	return s;
 }

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C14 [06/14] Always use the name "kmem_cache" for the slab cache with the kmem_cache structure.

[Christoph Lameter]

Make all allocators use the "kmem_cache" slabname for the "kmem_cache" structure.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.c        |   72 ++++++++++++++++++++++++++++--------------------------
 mm/slab.h        |    6 +++++
 mm/slab_common.c |    1 +
 mm/slob.c        |    8 ++++++
 mm/slub.c        |    2 --
 5 files changed, 52 insertions(+), 37 deletions(-)

Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c	2012-09-04 18:00:16.762081112 -0500
+++ linux/mm/slab.c	2012-09-04 18:01:57.579654538 -0500
@@ -578,9 +578,9 @@ static struct arraycache_init initarray_
     { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} };
 
 /* internal cache of cache description objs */
-static struct kmem_list3 *cache_cache_nodelists[MAX_NUMNODES];
-static struct kmem_cache cache_cache = {
-	.nodelists = cache_cache_nodelists,
+static struct kmem_list3 *kmem_cache_nodelists[MAX_NUMNODES];
+static struct kmem_cache kmem_cache_boot = {
+	.nodelists = kmem_cache_nodelists,
 	.batchcount = 1,
 	.limit = BOOT_CPUCACHE_ENTRIES,
 	.shared = 1,
@@ -1594,15 +1594,17 @@ void __init kmem_cache_init(void)
 	int order;
 	int node;
 
+	kmem_cache = &kmem_cache_boot;
+
 	if (num_possible_nodes() == 1)
 		use_alien_caches = 0;
 
 	for (i = 0; i < NUM_INIT_LISTS; i++) {
 		kmem_list3_init(&initkmem_list3[i]);
 		if (i < MAX_NUMNODES)
-			cache_cache.nodelists[i] = NULL;
+			kmem_cache->nodelists[i] = NULL;
 	}
-	set_up_list3s(&cache_cache, CACHE_CACHE);
+	set_up_list3s(kmem_cache, CACHE_CACHE);
 
 	/*
 	 * Fragmentation resistance on low memory - only use bigger
@@ -1614,9 +1616,9 @@ void __init kmem_cache_init(void)
 
 	/* Bootstrap is tricky, because several objects are allocated
 	 * from caches that do not exist yet:
-	 * 1) initialize the cache_cache cache: it contains the struct
-	 *    kmem_cache structures of all caches, except cache_cache itself:
-	 *    cache_cache is statically allocated.
+	 * 1) initialize the kmem_cache cache: it contains the struct
+	 *    kmem_cache structures of all caches, except kmem_cache itself:
+	 *    kmem_cache is statically allocated.
 	 *    Initially an __init data area is used for the head array and the
 	 *    kmem_list3 structures, it's replaced with a kmalloc allocated
 	 *    array at the end of the bootstrap.
@@ -1625,43 +1627,43 @@ void __init kmem_cache_init(void)
 	 *    An __init data area is used for the head array.
 	 * 3) Create the remaining kmalloc caches, with minimally sized
 	 *    head arrays.
-	 * 4) Replace the __init data head arrays for cache_cache and the first
+	 * 4) Replace the __init data head arrays for kmem_cache and the first
 	 *    kmalloc cache with kmalloc allocated arrays.
-	 * 5) Replace the __init data for kmem_list3 for cache_cache and
+	 * 5) Replace the __init data for kmem_list3 for kmem_cache and
 	 *    the other cache's with kmalloc allocated memory.
 	 * 6) Resize the head arrays of the kmalloc caches to their final sizes.
 	 */
 
 	node = numa_mem_id();
 
-	/* 1) create the cache_cache */
+	/* 1) create the kmem_cache */
 	INIT_LIST_HEAD(&slab_caches);
-	list_add(&cache_cache.list, &slab_caches);
-	cache_cache.colour_off = cache_line_size();
-	cache_cache.array[smp_processor_id()] = &initarray_cache.cache;
-	cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE + node];
+	list_add(&kmem_cache->list, &slab_caches);
+	kmem_cache->colour_off = cache_line_size();
+	kmem_cache->array[smp_processor_id()] = &initarray_cache.cache;
+	kmem_cache->nodelists[node] = &initkmem_list3[CACHE_CACHE + node];
 
 	/*
 	 * struct kmem_cache size depends on nr_node_ids & nr_cpu_ids
 	 */
-	cache_cache.size = offsetof(struct kmem_cache, array[nr_cpu_ids]) +
+	kmem_cache->size = offsetof(struct kmem_cache, array[nr_cpu_ids]) +
 				  nr_node_ids * sizeof(struct kmem_list3 *);
-	cache_cache.object_size = cache_cache.size;
-	cache_cache.size = ALIGN(cache_cache.size,
+	kmem_cache->object_size = kmem_cache->size;
+	kmem_cache->size = ALIGN(kmem_cache->object_size,
 					cache_line_size());
-	cache_cache.reciprocal_buffer_size =
-		reciprocal_value(cache_cache.size);
+	kmem_cache->reciprocal_buffer_size =
+		reciprocal_value(kmem_cache->size);
 
 	for (order = 0; order < MAX_ORDER; order++) {
-		cache_estimate(order, cache_cache.size,
-			cache_line_size(), 0, &left_over, &cache_cache.num);
-		if (cache_cache.num)
+		cache_estimate(order, kmem_cache->size,
+			cache_line_size(), 0, &left_over, &kmem_cache->num);
+		if (kmem_cache->num)
 			break;
 	}
-	BUG_ON(!cache_cache.num);
-	cache_cache.gfporder = order;
-	cache_cache.colour = left_over / cache_cache.colour_off;
-	cache_cache.slab_size = ALIGN(cache_cache.num * sizeof(kmem_bufctl_t) +
+	BUG_ON(!kmem_cache->num);
+	kmem_cache->gfporder = order;
+	kmem_cache->colour = left_over / kmem_cache->colour_off;
+	kmem_cache->slab_size = ALIGN(kmem_cache->num * sizeof(kmem_bufctl_t) +
 				      sizeof(struct slab), cache_line_size());
 
 	/* 2+3) create the kmalloc caches */
@@ -1728,15 +1730,15 @@ void __init kmem_cache_init(void)
 
 		ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT);
 
-		BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache);
-		memcpy(ptr, cpu_cache_get(&cache_cache),
+		BUG_ON(cpu_cache_get(kmem_cache) != &initarray_cache.cache);
+		memcpy(ptr, cpu_cache_get(kmem_cache),
 		       sizeof(struct arraycache_init));
 		/*
 		 * Do not assume that spinlocks can be initialized via memcpy:
 		 */
 		spin_lock_init(&ptr->lock);
 
-		cache_cache.array[smp_processor_id()] = ptr;
+		kmem_cache->array[smp_processor_id()] = ptr;
 
 		ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT);
 
@@ -1757,7 +1759,7 @@ void __init kmem_cache_init(void)
 		int nid;
 
 		for_each_online_node(nid) {
-			init_list(&cache_cache, &initkmem_list3[CACHE_CACHE + nid], nid);
+			init_list(kmem_cache, &initkmem_list3[CACHE_CACHE + nid], nid);
 
 			init_list(malloc_sizes[INDEX_AC].cs_cachep,
 				  &initkmem_list3[SIZE_AC + nid], nid);
@@ -2223,7 +2225,7 @@ void __kmem_cache_destroy(struct kmem_ca
 			kfree(l3);
 		}
 	}
-	kmem_cache_free(&cache_cache, cachep);
+	kmem_cache_free(kmem_cache, cachep);
 }
 
 
@@ -2473,7 +2475,7 @@ __kmem_cache_create (const char *name, s
 		gfp = GFP_NOWAIT;
 
 	/* Get cache's description obj. */
-	cachep = kmem_cache_zalloc(&cache_cache, gfp);
+	cachep = kmem_cache_zalloc(kmem_cache, gfp);
 	if (!cachep)
 		return NULL;
 
@@ -2531,7 +2533,7 @@ __kmem_cache_create (const char *name, s
 	if (!cachep->num) {
 		printk(KERN_ERR
 		       "kmem_cache_create: couldn't create cache %s.\n", name);
-		kmem_cache_free(&cache_cache, cachep);
+		kmem_cache_free(kmem_cache, cachep);
 		return NULL;
 	}
 	slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t)
@@ -3300,7 +3302,7 @@ static void *cache_alloc_debugcheck_afte
 
 static bool slab_should_failslab(struct kmem_cache *cachep, gfp_t flags)
 {
-	if (cachep == &cache_cache)
+	if (cachep == kmem_cache)
 		return false;
 
 	return should_failslab(cachep->object_size, flags, cachep->flags);
Index: linux/mm/slab.h
===================================================================
--- linux.orig/mm/slab.h	2012-09-04 18:00:16.762081112 -0500
+++ linux/mm/slab.h	2012-09-04 18:01:56.843643054 -0500
@@ -25,8 +25,14 @@ extern enum slab_state slab_state;
 
 /* The slab cache mutex protects the management structures during changes */
 extern struct mutex slab_mutex;
+
+/* The list of all slab caches on the system */
 extern struct list_head slab_caches;
 
+/* The slab cache that manages slab cache information */
+extern struct kmem_cache *kmem_cache;
+
+/* Functions provided by the slab allocators */
 struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *));
 
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.762081112 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:57.595654791 -0500
@@ -22,6 +22,7 @@
 enum slab_state slab_state;
 LIST_HEAD(slab_caches);
 DEFINE_MUTEX(slab_mutex);
+struct kmem_cache *kmem_cache;
 
 #ifdef CONFIG_DEBUG_VM
 static int kmem_cache_sanity_check(const char *name, size_t size)
Index: linux/mm/slob.c
===================================================================
--- linux.orig/mm/slob.c	2012-09-04 18:00:16.762081112 -0500
+++ linux/mm/slob.c	2012-09-04 18:01:57.587654667 -0500
@@ -622,8 +622,16 @@ int kmem_cache_shrink(struct kmem_cache
 }
 EXPORT_SYMBOL(kmem_cache_shrink);
 
+struct kmem_cache kmem_cache_boot = {
+	.name = "kmem_cache",
+	.size = sizeof(struct kmem_cache),
+	.flags = SLAB_PANIC,
+	.align = ARCH_KMALLOC_MINALIGN,
+};
+
 void __init kmem_cache_init(void)
 {
+	kmem_cache = &kmem_cache_boot;
 	slab_state = UP;
 }
 
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.762081112 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:57.607654976 -0500
@@ -3221,8 +3221,6 @@ void __kmem_cache_destroy(struct kmem_ca
 struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT];
 EXPORT_SYMBOL(kmalloc_caches);
 
-static struct kmem_cache *kmem_cache;
-
 #ifdef CONFIG_ZONE_DMA
 static struct kmem_cache *kmalloc_dma_caches[SLUB_PAGE_SHIFT];
 #endif

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C14 [12/14] Move kmem_cache allocations into common code.

[Christoph Lameter]

Shift the allocations to common code. That way the allocation
and freeing of the kmem_cache structures is handled by common code.

V3->V4: Remove kmemleak_alloc() from slob (goes with the slob_alloc)
V2->V3: Use GFP_KERNEL instead of GFP_NOWAIT (JoonSoo Kim).
V1->V2: Use the return code from setup_cpucache() in slab instead of returning -ENOSPC

Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
---
 mm/slab.c        |   34 ++++++++++++++++------------------
 mm/slab.h        |    4 ++--
 mm/slab_common.c |   18 ++++++++++--------
 mm/slob.c        |   43 ++++++++++++++++++-------------------------
 mm/slub.c        |   22 ++++++----------------
 5 files changed, 52 insertions(+), 69 deletions(-)

Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c	2012-09-04 18:00:16.802081734 -0500
+++ linux/mm/slab.c	2012-09-04 18:01:53.443589991 -0500
@@ -1676,7 +1676,8 @@ void __init kmem_cache_init(void)
 	 * bug.
 	 */
 
-	sizes[INDEX_AC].cs_cachep = __kmem_cache_create(names[INDEX_AC].name,
+	sizes[INDEX_AC].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+	__kmem_cache_create(sizes[INDEX_AC].cs_cachep, names[INDEX_AC].name,
 					sizes[INDEX_AC].cs_size,
 					ARCH_KMALLOC_MINALIGN,
 					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
@@ -1684,8 +1685,8 @@ void __init kmem_cache_init(void)
 
 	list_add(&sizes[INDEX_AC].cs_cachep->list, &slab_caches);
 	if (INDEX_AC != INDEX_L3) {
-		sizes[INDEX_L3].cs_cachep =
-			__kmem_cache_create(names[INDEX_L3].name,
+		sizes[INDEX_L3].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+		__kmem_cache_create(sizes[INDEX_L3].cs_cachep, names[INDEX_L3].name,
 				sizes[INDEX_L3].cs_size,
 				ARCH_KMALLOC_MINALIGN,
 				ARCH_KMALLOC_FLAGS|SLAB_PANIC,
@@ -1704,7 +1705,8 @@ void __init kmem_cache_init(void)
 		 * allow tighter packing of the smaller caches.
 		 */
 		if (!sizes->cs_cachep) {
-			sizes->cs_cachep = __kmem_cache_create(names->name,
+			sizes->cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+			__kmem_cache_create(sizes->cs_cachep, names->name,
 					sizes->cs_size,
 					ARCH_KMALLOC_MINALIGN,
 					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
@@ -1712,7 +1714,8 @@ void __init kmem_cache_init(void)
 			list_add(&sizes->cs_cachep->list, &slab_caches);
 		}
 #ifdef CONFIG_ZONE_DMA
-		sizes->cs_dmacachep = __kmem_cache_create(
+		sizes->cs_dmacachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+		__kmem_cache_create(sizes->cs_dmacachep,
 					names->name_dma,
 					sizes->cs_size,
 					ARCH_KMALLOC_MINALIGN,
@@ -2356,13 +2359,13 @@ static int __init_refok setup_cpu_cache(
  * cacheline.  This can be beneficial if you're counting cycles as closely
  * as davem.
  */
-struct kmem_cache *
-__kmem_cache_create (const char *name, size_t size, size_t align,
+int
+__kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, size_t align,
 	unsigned long flags, void (*ctor)(void *))
 {
 	size_t left_over, slab_size, ralign;
-	struct kmem_cache *cachep = NULL;
 	gfp_t gfp;
+	int err;
 
 #if DEBUG
 #if FORCED_DEBUG
@@ -2450,11 +2453,6 @@ __kmem_cache_create (const char *name, s
 	else
 		gfp = GFP_NOWAIT;
 
-	/* Get cache's description obj. */
-	cachep = kmem_cache_zalloc(kmem_cache, gfp);
-	if (!cachep)
-		return NULL;
-
 	cachep->nodelists = (struct kmem_list3 **)&cachep->array[nr_cpu_ids];
 	cachep->object_size = size;
 	cachep->align = align;
@@ -2509,8 +2507,7 @@ __kmem_cache_create (const char *name, s
 	if (!cachep->num) {
 		printk(KERN_ERR
 		       "kmem_cache_create: couldn't create cache %s.\n", name);
-		kmem_cache_free(kmem_cache, cachep);
-		return NULL;
+		return -E2BIG;
 	}
 	slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t)
 			  + sizeof(struct slab), align);
@@ -2567,9 +2564,10 @@ __kmem_cache_create (const char *name, s
 	cachep->name = name;
 	cachep->refcount = 1;
 
-	if (setup_cpu_cache(cachep, gfp)) {
+	err = setup_cpu_cache(cachep, gfp);
+	if (err) {
 		__kmem_cache_shutdown(cachep);
-		return NULL;
+		return err;
 	}
 
 	if (flags & SLAB_DEBUG_OBJECTS) {
@@ -2582,7 +2580,7 @@ __kmem_cache_create (const char *name, s
 		slab_set_debugobj_lock_classes(cachep);
 	}
 
-	return cachep;
+	return 0;
 }
 
 #if DEBUG
Index: linux/mm/slab.h
===================================================================
--- linux.orig/mm/slab.h	2012-09-04 18:00:16.842082349 -0500
+++ linux/mm/slab.h	2012-09-04 18:01:53.435589865 -0500
@@ -33,8 +33,8 @@ extern struct list_head slab_caches;
 extern struct kmem_cache *kmem_cache;
 
 /* Functions provided by the slab allocators */
-struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
-	size_t align, unsigned long flags, void (*ctor)(void *));
+extern int __kmem_cache_create(struct kmem_cache *, const char *name,
+	size_t size, size_t align, unsigned long flags, void (*ctor)(void *));
 
 #ifdef CONFIG_SLUB
 struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c	2012-09-04 18:00:16.842082349 -0500
+++ linux/mm/slab_common.c	2012-09-04 18:01:53.463590303 -0500
@@ -119,19 +119,21 @@ struct kmem_cache *kmem_cache_create(con
 	if (s)
 		goto out_locked;
 
-	s = __kmem_cache_create(n, size, align, flags, ctor);
-
+	s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL);
 	if (s) {
-		/*
-		 * Check if the slab has actually been created and if it was a
-		 * real instatiation. Aliases do not belong on the list
-		 */
-		if (s->refcount == 1)
+		err = __kmem_cache_create(s, n, size, align, flags, ctor);
+		if (!err)
+
 			list_add(&s->list, &slab_caches);
 
+		else {
+			kfree(n);
+			kmem_cache_free(kmem_cache, s);
+		}
+
 	} else {
 		kfree(n);
-		err = -ENOSYS; /* Until __kmem_cache_create returns code */
+		err = -ENOMEM;
 	}
 
 out_locked:
Index: linux/mm/slob.c
===================================================================
--- linux.orig/mm/slob.c	2012-09-04 18:00:16.802081734 -0500
+++ linux/mm/slob.c	2012-09-04 18:01:53.451590115 -0500
@@ -508,34 +508,26 @@ size_t ksize(const void *block)
 }
 EXPORT_SYMBOL(ksize);
 
-struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
+int __kmem_cache_create(struct kmem_cache *c, const char *name, size_t size,
 	size_t align, unsigned long flags, void (*ctor)(void *))
 {
-	struct kmem_cache *c;
-
-	c = slob_alloc(sizeof(struct kmem_cache),
-		GFP_KERNEL, ARCH_KMALLOC_MINALIGN, -1);
-
-	if (c) {
-		c->name = name;
-		c->size = size;
-		if (flags & SLAB_DESTROY_BY_RCU) {
-			/* leave room for rcu footer at the end of object */
-			c->size += sizeof(struct slob_rcu);
-		}
-		c->flags = flags;
-		c->ctor = ctor;
-		/* ignore alignment unless it's forced */
-		c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0;
-		if (c->align < ARCH_SLAB_MINALIGN)
-			c->align = ARCH_SLAB_MINALIGN;
-		if (c->align < align)
-			c->align = align;
-
-		kmemleak_alloc(c, sizeof(struct kmem_cache), 1, GFP_KERNEL);
-		c->refcount = 1;
+	c->name = name;
+	c->size = size;
+	if (flags & SLAB_DESTROY_BY_RCU) {
+		/* leave room for rcu footer at the end of object */
+		c->size += sizeof(struct slob_rcu);
 	}
-	return c;
+	c->flags = flags;
+	c->ctor = ctor;
+	/* ignore alignment unless it's forced */
+	c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0;
+	if (c->align < ARCH_SLAB_MINALIGN)
+		c->align = ARCH_SLAB_MINALIGN;
+	if (c->align < align)
+		c->align = align;
+
+	c->refcount = 1;
+	return 0;
 }
 
 void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
Index: linux/mm/slub.c
===================================================================
--- linux.orig/mm/slub.c	2012-09-04 18:00:16.842082349 -0500
+++ linux/mm/slub.c	2012-09-04 18:01:53.475590489 -0500
@@ -3034,7 +3034,6 @@ static int kmem_cache_open(struct kmem_c
 		size_t align, unsigned long flags,
 		void (*ctor)(void *))
 {
-	memset(s, 0, kmem_size);
 	s->name = name;
 	s->ctor = ctor;
 	s->object_size = size;
@@ -3109,7 +3108,7 @@ static int kmem_cache_open(struct kmem_c
 		goto error;
 
 	if (alloc_kmem_cache_cpus(s))
-		return 1;
+		return 0;
 
 	free_kmem_cache_nodes(s);
 error:
@@ -3118,7 +3117,7 @@ error:
 			"order=%u offset=%u flags=%lx\n",
 			s->name, (unsigned long)size, s->size, oo_order(s->oo),
 			s->offset, flags);
-	return 0;
+	return -EINVAL;
 }
 
 /*
@@ -3260,13 +3259,13 @@ static struct kmem_cache *__init create_
 {
 	struct kmem_cache *s;
 
-	s = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
+	s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
 
 	/*
 	 * This function is called with IRQs disabled during early-boot on
 	 * single CPU so there's no need to take slab_mutex here.
 	 */
-	if (!kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN,
+	if (kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN,
 								flags, NULL))
 		goto panic;
 
@@ -3944,20 +3943,11 @@ struct kmem_cache *__kmem_cache_alias(co
 	return s;
 }
 
-struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
+int __kmem_cache_create(struct kmem_cache *s,
+		const char *name, size_t size,
 		size_t align, unsigned long flags, void (*ctor)(void *))
 {
-	struct kmem_cache *s;
-
-	s = kmem_cache_alloc(kmem_cache, GFP_KERNEL);
-	if (s) {
-		if (kmem_cache_open(s, name,
-				size, align, flags, ctor)) {
-			return s;
-		}
-		kmem_cache_free(kmem_cache, s);
-	}
-	return NULL;
+	return kmem_cache_open(s, name, size, align, flags, ctor);
 }
 
 #ifdef CONFIG_SMP

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