diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/slab.h | 34 | ||||
| -rw-r--r-- | include/linux/slub_def.h | 19 |
2 files changed, 27 insertions, 26 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h index c97fe92532d1..c01780540054 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -163,7 +163,12 @@ struct kmem_cache { #else /* CONFIG_SLOB */ /* - * The largest kmalloc size supported by the slab allocators is + * Kmalloc array related definitions + */ + +#ifdef CONFIG_SLAB +/* + * The largest kmalloc size supported by the SLAB allocators is * 32 megabyte (2^25) or the maximum allocatable page order if that is * less than 32 MB. * @@ -173,9 +178,24 @@ struct kmem_cache { */ #define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \ (MAX_ORDER + PAGE_SHIFT - 1) : 25) +#define KMALLOC_SHIFT_MAX KMALLOC_SHIFT_HIGH +#define KMALLOC_SHIFT_LOW 5 +#else +/* + * SLUB allocates up to order 2 pages directly and otherwise + * passes the request to the page allocator. + */ +#define KMALLOC_SHIFT_HIGH (PAGE_SHIFT + 1) +#define KMALLOC_SHIFT_MAX (MAX_ORDER + PAGE_SHIFT) +#define KMALLOC_SHIFT_LOW 3 +#endif -#define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_HIGH) -#define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_HIGH - PAGE_SHIFT) +/* Maximum allocatable size */ +#define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_MAX) +/* Maximum size for which we actually use a slab cache */ +#define KMALLOC_MAX_CACHE_SIZE (1UL << KMALLOC_SHIFT_HIGH) +/* Maximum order allocatable via the slab allocagtor */ +#define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_MAX - PAGE_SHIFT) /* * Kmalloc subsystem. @@ -183,15 +203,9 @@ struct kmem_cache { #if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8 #define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN #else -#ifdef CONFIG_SLAB -#define KMALLOC_MIN_SIZE 32 -#else -#define KMALLOC_MIN_SIZE 8 -#endif +#define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW) #endif -#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) - /* * Figure out which kmalloc slab an allocation of a certain size * belongs to. diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index 99c3e05ff1f0..032028ef9a34 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -115,19 +115,6 @@ struct kmem_cache { struct kmem_cache_node *node[MAX_NUMNODES]; }; -/* - * 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 @@ -139,7 +126,7 @@ struct kmem_cache { * 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]; +extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1]; /* * Find the slab cache for a given combination of allocation flags and size. @@ -211,7 +198,7 @@ static __always_inline void *kmalloc_large(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)) { @@ -247,7 +234,7 @@ kmem_cache_alloc_node_trace(struct kmem_cache *s, 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)) { + size <= KMALLOC_MAX_CACHE_SIZE && !(flags & SLUB_DMA)) { struct kmem_cache *s = kmalloc_slab(size); if (!s) |