#endif
};
-struct kmem_cache_node {
- spinlock_t list_lock; /* Protect partial list and nr_partial */
- unsigned long nr_partial;
- struct list_head partial;
-#ifdef CONFIG_SLUB_DEBUG
- atomic_long_t nr_slabs;
- atomic_long_t total_objects;
- struct list_head full;
-#endif
-};
-
/*
* Word size structure that can be atomically updated or read and that
* contains both the order and the number of objects that a slab of the
struct kmem_cache_node *node[MAX_NUMNODES];
};
-/*
- * Kmalloc subsystem.
- */
-#if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8
-#define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN
-#else
-#define KMALLOC_MIN_SIZE 8
-#endif
-
-#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE)
-
-/*
- * Maximum kmalloc object size handled by SLUB. Larger object allocations
- * are passed through to the page allocator. The page allocator "fastpath"
- * is relatively slow so we need this value sufficiently high so that
- * performance critical objects are allocated through the SLUB fastpath.
- *
- * This should be dropped to PAGE_SIZE / 2 once the page allocator
- * "fastpath" becomes competitive with the slab allocator fastpaths.
- */
-#define SLUB_MAX_SIZE (2 * PAGE_SIZE)
-
-#define SLUB_PAGE_SHIFT (PAGE_SHIFT + 2)
-
-#ifdef CONFIG_ZONE_DMA
-#define SLUB_DMA __GFP_DMA
-#else
-/* Disable DMA functionality */
-#define SLUB_DMA (__force gfp_t)0
-#endif
-
-/*
- * We keep the general caches in an array of slab caches that are used for
- * 2^x bytes of allocations.
- */
-extern struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT];
-
-/*
- * Sorry that the following has to be that ugly but some versions of GCC
- * have trouble with constant propagation and loops.
- */
-static __always_inline int kmalloc_index(size_t size)
-{
- if (!size)
- return 0;
-
- if (size <= KMALLOC_MIN_SIZE)
- return KMALLOC_SHIFT_LOW;
-
- if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96)
- return 1;
- if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192)
- return 2;
- if (size <= 8) return 3;
- if (size <= 16) return 4;
- if (size <= 32) return 5;
- if (size <= 64) return 6;
- if (size <= 128) return 7;
- if (size <= 256) return 8;
- if (size <= 512) return 9;
- if (size <= 1024) return 10;
- if (size <= 2 * 1024) return 11;
- if (size <= 4 * 1024) return 12;
-/*
- * The following is only needed to support architectures with a larger page
- * size than 4k. We need to support 2 * PAGE_SIZE here. So for a 64k page
- * size we would have to go up to 128k.
- */
- if (size <= 8 * 1024) return 13;
- if (size <= 16 * 1024) return 14;
- if (size <= 32 * 1024) return 15;
- if (size <= 64 * 1024) return 16;
- if (size <= 128 * 1024) return 17;
- if (size <= 256 * 1024) return 18;
- if (size <= 512 * 1024) return 19;
- if (size <= 1024 * 1024) return 20;
- if (size <= 2 * 1024 * 1024) return 21;
- BUG();
- return -1; /* Will never be reached */
-
-/*
- * What we really wanted to do and cannot do because of compiler issues is:
- * int i;
- * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
- * if (size <= (1 << i))
- * return i;
- */
-}
-
-/*
- * Find the slab cache for a given combination of allocation flags and size.
- *
- * This ought to end up with a global pointer to the right cache
- * in kmalloc_caches.
- */
-static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
-{
- int index = kmalloc_index(size);
-
- if (index == 0)
- return NULL;
-
- return kmalloc_caches[index];
-}
-
void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
void *__kmalloc(size_t size, gfp_t flags);
static __always_inline void *kmalloc(size_t size, gfp_t flags)
{
if (__builtin_constant_p(size)) {
- if (size > SLUB_MAX_SIZE)
+ if (size > KMALLOC_MAX_CACHE_SIZE)
return kmalloc_large(size, flags);
- if (!(flags & SLUB_DMA)) {
- struct kmem_cache *s = kmalloc_slab(size);
+ if (!(flags & GFP_DMA)) {
+ int index = kmalloc_index(size);
- if (!s)
+ if (!index)
return ZERO_SIZE_PTR;
- return kmem_cache_alloc_trace(s, flags, size);
+ return kmem_cache_alloc_trace(kmalloc_caches[index],
+ flags, size);
}
}
return __kmalloc(size, flags);
static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
if (__builtin_constant_p(size) &&
- size <= SLUB_MAX_SIZE && !(flags & SLUB_DMA)) {
- struct kmem_cache *s = kmalloc_slab(size);
+ size <= KMALLOC_MAX_CACHE_SIZE && !(flags & GFP_DMA)) {
+ int index = kmalloc_index(size);
- if (!s)
+ if (!index)
return ZERO_SIZE_PTR;
- return kmem_cache_alloc_node_trace(s, flags, node, size);
+ return kmem_cache_alloc_node_trace(kmalloc_caches[index],
+ flags, node, size);
}
return __kmalloc_node(size, flags, node);
}
projects / linux-2.6-block.git / blobdiff