diff options
author | Christoph Lameter <cl@linux.com> | 2012-11-28 16:23:07 +0000 |
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committer | Pekka Enberg <penberg@kernel.org> | 2012-12-11 12:14:27 +0200 |
commit | dffb4d605c23110e3ad54b8c9f244a8235c013c2 (patch) | |
tree | ba69e37ef8c5c69ea4ae68b2f3679ab77697613a | |
parent | 45530c4474d258b822e2639c786606d8257aad8b (diff) | |
download | linux-dffb4d605c23110e3ad54b8c9f244a8235c013c2.tar.bz2 |
slub: Use statically allocated kmem_cache boot structure for bootstrap
Simplify bootstrap by statically allocated two kmem_cache structures. These are
freed after bootup is complete. Allows us to no longer worry about calculations
of sizes of kmem_cache structures during bootstrap.
Reviewed-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
-rw-r--r-- | mm/slub.c | 67 |
1 files changed, 20 insertions, 47 deletions
diff --git a/mm/slub.c b/mm/slub.c index 1be172c157c3..c82453ac812a 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -176,8 +176,6 @@ static inline int kmem_cache_debug(struct kmem_cache *s) #define __OBJECT_POISON 0x80000000UL /* Poison object */ #define __CMPXCHG_DOUBLE 0x40000000UL /* Use cmpxchg_double */ -static int kmem_size = sizeof(struct kmem_cache); - #ifdef CONFIG_SMP static struct notifier_block slab_notifier; #endif @@ -3634,15 +3632,16 @@ static int slab_memory_callback(struct notifier_block *self, /* * Used for early kmem_cache structures that were allocated using - * the page allocator + * the page allocator. Allocate them properly then fix up the pointers + * that may be pointing to the wrong kmem_cache structure. */ -static void __init kmem_cache_bootstrap_fixup(struct kmem_cache *s) +static struct kmem_cache * __init bootstrap(struct kmem_cache *static_cache) { int node; + struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); - list_add(&s->list, &slab_caches); - s->refcount = -1; + memcpy(s, static_cache, kmem_cache->object_size); for_each_node_state(node, N_NORMAL_MEMORY) { struct kmem_cache_node *n = get_node(s, node); @@ -3658,70 +3657,44 @@ static void __init kmem_cache_bootstrap_fixup(struct kmem_cache *s) #endif } } + list_add(&s->list, &slab_caches); + return s; } void __init kmem_cache_init(void) { + static __initdata struct kmem_cache boot_kmem_cache, + boot_kmem_cache_node; int i; - int caches = 0; - struct kmem_cache *temp_kmem_cache; - int order; - struct kmem_cache *temp_kmem_cache_node; - unsigned long kmalloc_size; + int caches = 2; if (debug_guardpage_minorder()) slub_max_order = 0; - kmem_size = offsetof(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()); - order = get_order(2 * kmalloc_size); - kmem_cache = (void *)__get_free_pages(GFP_NOWAIT | __GFP_ZERO, order); + kmem_cache_node = &boot_kmem_cache_node; + kmem_cache = &boot_kmem_cache; - /* - * Must first have the slab cache available for the allocations of the - * struct kmem_cache_node's. There is special bootstrap code in - * kmem_cache_open for slab_state == DOWN. - */ - 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); /* Able to allocate the per node structures */ 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", + offsetof(struct kmem_cache, node) + + nr_node_ids * sizeof(struct kmem_cache_node *), + SLAB_HWCACHE_ALIGN); - kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); - memcpy(kmem_cache, temp_kmem_cache, kmem_size); + kmem_cache = bootstrap(&boot_kmem_cache); /* * Allocate kmem_cache_node properly from the kmem_cache slab. * kmem_cache_node is separately allocated so no need to * update any list pointers. */ - temp_kmem_cache_node = kmem_cache_node; - - kmem_cache_node = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); - memcpy(kmem_cache_node, temp_kmem_cache_node, kmem_size); - - kmem_cache_bootstrap_fixup(kmem_cache_node); - - caches++; - kmem_cache_bootstrap_fixup(kmem_cache); - caches++; - /* Free temporary boot structure */ - free_pages((unsigned long)temp_kmem_cache, order); + kmem_cache_node = bootstrap(&boot_kmem_cache_node); /* Now we can use the kmem_cache to allocate kmalloc slabs */ |