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2e892f43 CL |
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> | |
02af61bb | 17 | #include <linux/kmemtrace.h> |
2e892f43 | 18 | |
8eae985f PE |
19 | /* |
20 | * struct kmem_cache | |
21 | * | |
22 | * manages a cache. | |
23 | */ | |
24 | ||
25 | struct kmem_cache { | |
26 | /* 1) per-cpu data, touched during every alloc/free */ | |
27 | struct array_cache *array[NR_CPUS]; | |
28 | /* 2) Cache tunables. Protected by cache_chain_mutex */ | |
29 | unsigned int batchcount; | |
30 | unsigned int limit; | |
31 | unsigned int shared; | |
32 | ||
33 | unsigned int buffer_size; | |
34 | u32 reciprocal_buffer_size; | |
35 | /* 3) touched by every alloc & free from the backend */ | |
36 | ||
37 | unsigned int flags; /* constant flags */ | |
38 | unsigned int num; /* # of objs per slab */ | |
39 | ||
40 | /* 4) cache_grow/shrink */ | |
41 | /* order of pgs per slab (2^n) */ | |
42 | unsigned int gfporder; | |
43 | ||
44 | /* force GFP flags, e.g. GFP_DMA */ | |
45 | gfp_t gfpflags; | |
46 | ||
47 | size_t colour; /* cache colouring range */ | |
48 | unsigned int colour_off; /* colour offset */ | |
49 | struct kmem_cache *slabp_cache; | |
50 | unsigned int slab_size; | |
51 | unsigned int dflags; /* dynamic flags */ | |
52 | ||
53 | /* constructor func */ | |
54 | void (*ctor)(void *obj); | |
55 | ||
56 | /* 5) cache creation/removal */ | |
57 | const char *name; | |
58 | struct list_head next; | |
59 | ||
60 | /* 6) statistics */ | |
61 | #ifdef CONFIG_DEBUG_SLAB | |
62 | unsigned long num_active; | |
63 | unsigned long num_allocations; | |
64 | unsigned long high_mark; | |
65 | unsigned long grown; | |
66 | unsigned long reaped; | |
67 | unsigned long errors; | |
68 | unsigned long max_freeable; | |
69 | unsigned long node_allocs; | |
70 | unsigned long node_frees; | |
71 | unsigned long node_overflow; | |
72 | atomic_t allochit; | |
73 | atomic_t allocmiss; | |
74 | atomic_t freehit; | |
75 | atomic_t freemiss; | |
76 | ||
77 | /* | |
78 | * If debugging is enabled, then the allocator can add additional | |
79 | * fields and/or padding to every object. buffer_size contains the total | |
80 | * object size including these internal fields, the following two | |
81 | * variables contain the offset to the user object and its size. | |
82 | */ | |
83 | int obj_offset; | |
84 | int obj_size; | |
85 | #endif /* CONFIG_DEBUG_SLAB */ | |
86 | ||
87 | /* | |
88 | * We put nodelists[] at the end of kmem_cache, because we want to size | |
89 | * this array to nr_node_ids slots instead of MAX_NUMNODES | |
90 | * (see kmem_cache_init()) | |
91 | * We still use [MAX_NUMNODES] and not [1] or [0] because cache_cache | |
92 | * is statically defined, so we reserve the max number of nodes. | |
93 | */ | |
94 | struct kmem_list3 *nodelists[MAX_NUMNODES]; | |
95 | /* | |
96 | * Do not add fields after nodelists[] | |
97 | */ | |
98 | }; | |
99 | ||
2e892f43 CL |
100 | /* Size description struct for general caches. */ |
101 | struct cache_sizes { | |
102 | size_t cs_size; | |
103 | struct kmem_cache *cs_cachep; | |
4b51d669 | 104 | #ifdef CONFIG_ZONE_DMA |
2e892f43 | 105 | struct kmem_cache *cs_dmacachep; |
4b51d669 | 106 | #endif |
2e892f43 CL |
107 | }; |
108 | extern struct cache_sizes malloc_sizes[]; | |
109 | ||
6193a2ff PM |
110 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t); |
111 | void *__kmalloc(size_t size, gfp_t flags); | |
112 | ||
0f24f128 | 113 | #ifdef CONFIG_TRACING |
36555751 EGM |
114 | extern void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags); |
115 | extern size_t slab_buffer_size(struct kmem_cache *cachep); | |
116 | #else | |
117 | static __always_inline void * | |
118 | kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags) | |
2e892f43 | 119 | { |
36555751 EGM |
120 | return kmem_cache_alloc(cachep, flags); |
121 | } | |
122 | static inline size_t slab_buffer_size(struct kmem_cache *cachep) | |
123 | { | |
124 | return 0; | |
125 | } | |
126 | #endif | |
127 | ||
128 | static __always_inline void *kmalloc(size_t size, gfp_t flags) | |
129 | { | |
130 | struct kmem_cache *cachep; | |
131 | void *ret; | |
132 | ||
2e892f43 CL |
133 | if (__builtin_constant_p(size)) { |
134 | int i = 0; | |
6cb8f913 CL |
135 | |
136 | if (!size) | |
137 | return ZERO_SIZE_PTR; | |
138 | ||
2e892f43 CL |
139 | #define CACHE(x) \ |
140 | if (size <= x) \ | |
141 | goto found; \ | |
142 | else \ | |
143 | i++; | |
1c61fc40 | 144 | #include <linux/kmalloc_sizes.h> |
2e892f43 | 145 | #undef CACHE |
1cf3eb2f | 146 | return NULL; |
2e892f43 | 147 | found: |
4b51d669 CL |
148 | #ifdef CONFIG_ZONE_DMA |
149 | if (flags & GFP_DMA) | |
36555751 EGM |
150 | cachep = malloc_sizes[i].cs_dmacachep; |
151 | else | |
4b51d669 | 152 | #endif |
36555751 EGM |
153 | cachep = malloc_sizes[i].cs_cachep; |
154 | ||
155 | ret = kmem_cache_alloc_notrace(cachep, flags); | |
156 | ||
ca2b84cb EGM |
157 | trace_kmalloc(_THIS_IP_, ret, |
158 | size, slab_buffer_size(cachep), flags); | |
36555751 EGM |
159 | |
160 | return ret; | |
2e892f43 CL |
161 | } |
162 | return __kmalloc(size, flags); | |
163 | } | |
164 | ||
2e892f43 CL |
165 | #ifdef CONFIG_NUMA |
166 | extern void *__kmalloc_node(size_t size, gfp_t flags, int node); | |
6193a2ff | 167 | extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); |
2e892f43 | 168 | |
0f24f128 | 169 | #ifdef CONFIG_TRACING |
36555751 EGM |
170 | extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep, |
171 | gfp_t flags, | |
172 | int nodeid); | |
173 | #else | |
174 | static __always_inline void * | |
175 | kmem_cache_alloc_node_notrace(struct kmem_cache *cachep, | |
176 | gfp_t flags, | |
177 | int nodeid) | |
178 | { | |
179 | return kmem_cache_alloc_node(cachep, flags, nodeid); | |
180 | } | |
181 | #endif | |
182 | ||
183 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) | |
2e892f43 | 184 | { |
36555751 EGM |
185 | struct kmem_cache *cachep; |
186 | void *ret; | |
187 | ||
2e892f43 CL |
188 | if (__builtin_constant_p(size)) { |
189 | int i = 0; | |
6cb8f913 CL |
190 | |
191 | if (!size) | |
192 | return ZERO_SIZE_PTR; | |
193 | ||
2e892f43 CL |
194 | #define CACHE(x) \ |
195 | if (size <= x) \ | |
196 | goto found; \ | |
197 | else \ | |
198 | i++; | |
1c61fc40 | 199 | #include <linux/kmalloc_sizes.h> |
2e892f43 | 200 | #undef CACHE |
1cf3eb2f | 201 | return NULL; |
2e892f43 | 202 | found: |
4b51d669 CL |
203 | #ifdef CONFIG_ZONE_DMA |
204 | if (flags & GFP_DMA) | |
36555751 EGM |
205 | cachep = malloc_sizes[i].cs_dmacachep; |
206 | else | |
4b51d669 | 207 | #endif |
36555751 EGM |
208 | cachep = malloc_sizes[i].cs_cachep; |
209 | ||
210 | ret = kmem_cache_alloc_node_notrace(cachep, flags, node); | |
211 | ||
ca2b84cb EGM |
212 | trace_kmalloc_node(_THIS_IP_, ret, |
213 | size, slab_buffer_size(cachep), | |
214 | flags, node); | |
36555751 EGM |
215 | |
216 | return ret; | |
2e892f43 CL |
217 | } |
218 | return __kmalloc_node(size, flags, node); | |
219 | } | |
220 | ||
221 | #endif /* CONFIG_NUMA */ | |
222 | ||
223 | #endif /* _LINUX_SLAB_DEF_H */ |