Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame^] | 1 | #ifndef _LINUX_SLAB_DEF_H |
| 2 | #define _LINUX_SLAB_DEF_H |
| 3 | |
| 4 | /* |
| 5 | * Definitions unique to the original Linux SLAB allocator. |
| 6 | * |
| 7 | * What we provide here is a way to optimize the frequent kmalloc |
| 8 | * calls in the kernel by selecting the appropriate general cache |
| 9 | * if kmalloc was called with a size that can be established at |
| 10 | * compile time. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/init.h> |
| 14 | #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */ |
| 15 | #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */ |
| 16 | #include <linux/compiler.h> |
| 17 | |
| 18 | /* Size description struct for general caches. */ |
| 19 | struct cache_sizes { |
| 20 | size_t cs_size; |
| 21 | struct kmem_cache *cs_cachep; |
| 22 | struct kmem_cache *cs_dmacachep; |
| 23 | }; |
| 24 | extern struct cache_sizes malloc_sizes[]; |
| 25 | |
| 26 | static inline void *kmalloc(size_t size, gfp_t flags) |
| 27 | { |
| 28 | if (__builtin_constant_p(size)) { |
| 29 | int i = 0; |
| 30 | #define CACHE(x) \ |
| 31 | if (size <= x) \ |
| 32 | goto found; \ |
| 33 | else \ |
| 34 | i++; |
| 35 | #include "kmalloc_sizes.h" |
| 36 | #undef CACHE |
| 37 | { |
| 38 | extern void __you_cannot_kmalloc_that_much(void); |
| 39 | __you_cannot_kmalloc_that_much(); |
| 40 | } |
| 41 | found: |
| 42 | return kmem_cache_alloc((flags & GFP_DMA) ? |
| 43 | malloc_sizes[i].cs_dmacachep : |
| 44 | malloc_sizes[i].cs_cachep, flags); |
| 45 | } |
| 46 | return __kmalloc(size, flags); |
| 47 | } |
| 48 | |
| 49 | static inline void *kzalloc(size_t size, gfp_t flags) |
| 50 | { |
| 51 | if (__builtin_constant_p(size)) { |
| 52 | int i = 0; |
| 53 | #define CACHE(x) \ |
| 54 | if (size <= x) \ |
| 55 | goto found; \ |
| 56 | else \ |
| 57 | i++; |
| 58 | #include "kmalloc_sizes.h" |
| 59 | #undef CACHE |
| 60 | { |
| 61 | extern void __you_cannot_kzalloc_that_much(void); |
| 62 | __you_cannot_kzalloc_that_much(); |
| 63 | } |
| 64 | found: |
| 65 | return kmem_cache_zalloc((flags & GFP_DMA) ? |
| 66 | malloc_sizes[i].cs_dmacachep : |
| 67 | malloc_sizes[i].cs_cachep, flags); |
| 68 | } |
| 69 | return __kzalloc(size, flags); |
| 70 | } |
| 71 | |
| 72 | #ifdef CONFIG_NUMA |
| 73 | extern void *__kmalloc_node(size_t size, gfp_t flags, int node); |
| 74 | |
| 75 | static inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
| 76 | { |
| 77 | if (__builtin_constant_p(size)) { |
| 78 | int i = 0; |
| 79 | #define CACHE(x) \ |
| 80 | if (size <= x) \ |
| 81 | goto found; \ |
| 82 | else \ |
| 83 | i++; |
| 84 | #include "kmalloc_sizes.h" |
| 85 | #undef CACHE |
| 86 | { |
| 87 | extern void __you_cannot_kmalloc_that_much(void); |
| 88 | __you_cannot_kmalloc_that_much(); |
| 89 | } |
| 90 | found: |
| 91 | return kmem_cache_alloc_node((flags & GFP_DMA) ? |
| 92 | malloc_sizes[i].cs_dmacachep : |
| 93 | malloc_sizes[i].cs_cachep, flags, node); |
| 94 | } |
| 95 | return __kmalloc_node(size, flags, node); |
| 96 | } |
| 97 | |
| 98 | #endif /* CONFIG_NUMA */ |
| 99 | |
| 100 | #endif /* _LINUX_SLAB_DEF_H */ |