Shift the allocations to common code. That way the allocation
and freeing of the kmem_cache structures is handled by common code.
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
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c 2012-08-08 12:56:08.517806807 -0500
+++ linux-2.6/mm/slab.c 2012-08-08 12:56:19.405836235 -0500
@@ -1673,7 +1673,8 @@ 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,
@@ -1681,8 +1682,8 @@ 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,
@@ -1701,7 +1702,8 @@ 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,
@@ -1709,7 +1711,8 @@ 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,
@@ -2353,13 +2356,13 @@ 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
@@ -2447,11 +2450,6 @@ __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;
@@ -2506,8 +2504,7 @@ __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);
@@ -2564,9 +2561,10 @@ __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) {
@@ -2579,7 +2577,7 @@ __kmem_cache_create (const char *name, s
slab_set_debugobj_lock_classes(cachep);
}
- return cachep;
+ return 0;
}
#if DEBUG
Index: linux-2.6/mm/slab.h
===================================================================
--- linux-2.6.orig/mm/slab.h 2012-08-08 12:56:08.505806774 -0500
+++ linux-2.6/mm/slab.h 2012-08-08 12:56:19.405836235 -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-2.6/mm/slab_common.c
===================================================================
--- linux-2.6.orig/mm/slab_common.c 2012-08-08 12:56:08.533806800 -0500
+++ linux-2.6/mm/slab_common.c 2012-08-08 12:56:19.405836235 -0500
@@ -104,19 +104,21 @@ 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-2.6/mm/slob.c
===================================================================
--- linux-2.6.orig/mm/slob.c 2012-08-08 12:56:08.525806780 -0500
+++ linux-2.6/mm/slob.c 2012-08-08 12:56:19.405836235 -0500
@@ -508,34 +508,27 @@ 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;
+
+ kmemleak_alloc(c, sizeof(struct kmem_cache), 1, GFP_KERNEL);
+ c->refcount = 1;
+ return 0;
}
void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2012-08-08 12:56:08.545806872 -0500
+++ linux-2.6/mm/slub.c 2012-08-08 12:56:38.981888970 -0500
@@ -3027,7 +3027,6 @@ 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;
@@ -3102,7 +3101,7 @@ 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:
@@ -3111,7 +3110,7 @@ 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;
}
/*
@@ -3259,7 +3258,7 @@ static struct kmem_cache *__init create_
* 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;
@@ -3937,20 +3936,11 @@ 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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