Use a special function to create kmalloc caches and use that function in
SLAB and SLUB.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slab.c | 53 +++++++++++++++++++++++------------------------------
1 file changed, 23 insertions(+), 30 deletions(-)
Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c 2012-08-08 14:33:32.438009523 -0500
+++ linux-2.6/mm/slab.c 2012-08-08 14:33:32.846012306 -0500
@@ -1681,23 +1681,13 @@ void __init kmem_cache_init(void)
* bug.
*/
- sizes[INDEX_AC].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
- 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);
+ sizes[INDEX_AC].cs_cachep = create_kmalloc_cache(names[INDEX_AC].name,
+ sizes[INDEX_AC].cs_size, ARCH_KMALLOC_FLAGS);
- if (INDEX_AC != INDEX_L3) {
- sizes[INDEX_L3].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
- 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);
- }
+ if (INDEX_AC != INDEX_L3)
+ sizes[INDEX_L3].cs_cachep =
+ create_kmalloc_cache(names[INDEX_L3].name,
+ sizes[INDEX_L3].cs_size, ARCH_KMALLOC_FLAGS);
slab_early_init = 0;
@@ -1709,24 +1699,14 @@ void __init kmem_cache_init(void)
* Note for systems short on memory removing the alignment will
* allow tighter packing of the smaller caches.
*/
- if (!sizes->cs_cachep) {
- sizes->cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
- 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);
- }
+ if (!sizes->cs_cachep)
+ sizes->cs_cachep = create_kmalloc_cache(names->name,
+ sizes->cs_size, ARCH_KMALLOC_FLAGS);
+
#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,
- ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| SLAB_PANIC);
- list_add(&sizes->cs_dmacachep->list, &slab_caches);
+ sizes->cs_dmacachep = create_kmalloc_cache(
+ names->name_dma, sizes->cs_size,
+ SLAB_CACHE_DMA|ARCH_KMALLOC_FLAGS);
#endif
sizes++;
names++;
Index: linux-2.6/mm/slab.h
===================================================================
--- linux-2.6.orig/mm/slab.h 2012-08-08 14:33:18.357913392 -0500
+++ linux-2.6/mm/slab.h 2012-08-08 14:33:32.846012306 -0500
@@ -35,6 +35,11 @@ extern struct kmem_cache *kmem_cache;
/* Functions provided by the slab allocators */
extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
+extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
+ unsigned long flags);
+extern void create_boot_cache(struct kmem_cache *, const char *name,
+ size_t size, unsigned long flags);
+
#ifdef CONFIG_SLUB
struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
size_t align, unsigned long flags, void (*ctor)(void *));
Index: linux-2.6/mm/slab_common.c
===================================================================
--- linux-2.6.orig/mm/slab_common.c 2012-08-08 14:33:31.934006086 -0500
+++ linux-2.6/mm/slab_common.c 2012-08-08 14:33:32.846012306 -0500
@@ -185,3 +185,35 @@ int slab_is_available(void)
{
return slab_state >= UP;
}
+
+/* Create a cache during boot when no slab services are available yet */
+void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t size,
+ unsigned long flags)
+{
+ int err;
+
+ s->name = name;
+ s->size = s->object_size = size;
+ s->align = ARCH_KMALLOC_MINALIGN;
+ err = __kmem_cache_create(s, flags);
+
+ if (err)
+ panic("Creation of kmalloc slab %s size=%ld failed. Reason %d\n",
+ name, size, err);
+
+ list_add(&s->list, &slab_caches);
+ s->refcount = -1; /* Exempt from merging for now */
+}
+
+struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size,
+ unsigned long flags)
+{
+ struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+
+ if (!s)
+ panic("Out of memory when creating slab %s\n", name);
+
+ create_boot_cache(s, name, size, flags);
+ s->refcount = 1;
+ return s;
+}
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2012-08-08 14:33:31.938006113 -0500
+++ linux-2.6/mm/slub.c 2012-08-08 14:33:38.738052474 -0500
@@ -3239,32 +3239,6 @@ static int __init setup_slub_nomerge(cha
__setup("slub_nomerge", setup_slub_nomerge);
-static struct kmem_cache *__init create_kmalloc_cache(const char *name,
- int size, unsigned int flags)
-{
- struct kmem_cache *s;
-
- s = kmem_cache_alloc(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, flags))
- goto panic;
-
- list_add(&s->list, &slab_caches);
- return s;
-
-panic:
- panic("Creation of kmalloc slab %s size=%d failed.\n", name, size);
- return NULL;
-}
-
/*
* Conversion table for small slabs sizes / 8 to the index in the
* kmalloc array. This is necessary for slabs < 192 since we have non power
@@ -3707,10 +3681,8 @@ void __init kmem_cache_init(void)
*/
kmem_cache_node = (void *)kmem_cache + kmalloc_size;
- 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);
+ create_boot_cache(kmem_cache_node, "kmem_cache_node",
+ sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN);
hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
@@ -3718,9 +3690,7 @@ void __init kmem_cache_init(void)
slab_state = PARTIAL;
temp_kmem_cache = kmem_cache;
- kmem_cache->name = "kmem_cache";
- kmem_cache->size = kmem_cache->object_size = kmem_size;
- kmem_cache_open(kmem_cache, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
+ create_boot_cache(kmem_cache, "kmem_cache", kmem_size, SLAB_HWCACHE_ALIGN);
kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
memcpy(kmem_cache, temp_kmem_cache, kmem_size);
--
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