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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 | |
1f0ce8b3 DW |
19 | #ifndef ARCH_KMALLOC_MINALIGN |
20 | /* | |
21 | * Enforce a minimum alignment for the kmalloc caches. | |
22 | * Usually, the kmalloc caches are cache_line_size() aligned, except when | |
23 | * DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned. | |
24 | * Some archs want to perform DMA into kmalloc caches and need a guaranteed | |
25 | * alignment larger than the alignment of a 64-bit integer. | |
26 | * ARCH_KMALLOC_MINALIGN allows that. | |
27 | * Note that increasing this value may disable some debug features. | |
28 | */ | |
29 | #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) | |
30 | #endif | |
31 | ||
32 | #ifndef ARCH_SLAB_MINALIGN | |
33 | /* | |
34 | * Enforce a minimum alignment for all caches. | |
35 | * Intended for archs that get misalignment faults even for BYTES_PER_WORD | |
36 | * aligned buffers. Includes ARCH_KMALLOC_MINALIGN. | |
37 | * If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables | |
38 | * some debug features. | |
39 | */ | |
40 | #define ARCH_SLAB_MINALIGN 0 | |
41 | #endif | |
42 | ||
8eae985f PE |
43 | /* |
44 | * struct kmem_cache | |
45 | * | |
46 | * manages a cache. | |
47 | */ | |
48 | ||
49 | struct kmem_cache { | |
50 | /* 1) per-cpu data, touched during every alloc/free */ | |
51 | struct array_cache *array[NR_CPUS]; | |
52 | /* 2) Cache tunables. Protected by cache_chain_mutex */ | |
53 | unsigned int batchcount; | |
54 | unsigned int limit; | |
55 | unsigned int shared; | |
56 | ||
57 | unsigned int buffer_size; | |
58 | u32 reciprocal_buffer_size; | |
59 | /* 3) touched by every alloc & free from the backend */ | |
60 | ||
61 | unsigned int flags; /* constant flags */ | |
62 | unsigned int num; /* # of objs per slab */ | |
63 | ||
64 | /* 4) cache_grow/shrink */ | |
65 | /* order of pgs per slab (2^n) */ | |
66 | unsigned int gfporder; | |
67 | ||
68 | /* force GFP flags, e.g. GFP_DMA */ | |
69 | gfp_t gfpflags; | |
70 | ||
71 | size_t colour; /* cache colouring range */ | |
72 | unsigned int colour_off; /* colour offset */ | |
73 | struct kmem_cache *slabp_cache; | |
74 | unsigned int slab_size; | |
75 | unsigned int dflags; /* dynamic flags */ | |
76 | ||
77 | /* constructor func */ | |
78 | void (*ctor)(void *obj); | |
79 | ||
80 | /* 5) cache creation/removal */ | |
81 | const char *name; | |
82 | struct list_head next; | |
83 | ||
84 | /* 6) statistics */ | |
85 | #ifdef CONFIG_DEBUG_SLAB | |
86 | unsigned long num_active; | |
87 | unsigned long num_allocations; | |
88 | unsigned long high_mark; | |
89 | unsigned long grown; | |
90 | unsigned long reaped; | |
91 | unsigned long errors; | |
92 | unsigned long max_freeable; | |
93 | unsigned long node_allocs; | |
94 | unsigned long node_frees; | |
95 | unsigned long node_overflow; | |
96 | atomic_t allochit; | |
97 | atomic_t allocmiss; | |
98 | atomic_t freehit; | |
99 | atomic_t freemiss; | |
100 | ||
101 | /* | |
102 | * If debugging is enabled, then the allocator can add additional | |
103 | * fields and/or padding to every object. buffer_size contains the total | |
104 | * object size including these internal fields, the following two | |
105 | * variables contain the offset to the user object and its size. | |
106 | */ | |
107 | int obj_offset; | |
108 | int obj_size; | |
109 | #endif /* CONFIG_DEBUG_SLAB */ | |
110 | ||
111 | /* | |
112 | * We put nodelists[] at the end of kmem_cache, because we want to size | |
113 | * this array to nr_node_ids slots instead of MAX_NUMNODES | |
114 | * (see kmem_cache_init()) | |
115 | * We still use [MAX_NUMNODES] and not [1] or [0] because cache_cache | |
116 | * is statically defined, so we reserve the max number of nodes. | |
117 | */ | |
118 | struct kmem_list3 *nodelists[MAX_NUMNODES]; | |
119 | /* | |
120 | * Do not add fields after nodelists[] | |
121 | */ | |
122 | }; | |
123 | ||
2e892f43 CL |
124 | /* Size description struct for general caches. */ |
125 | struct cache_sizes { | |
126 | size_t cs_size; | |
127 | struct kmem_cache *cs_cachep; | |
4b51d669 | 128 | #ifdef CONFIG_ZONE_DMA |
2e892f43 | 129 | struct kmem_cache *cs_dmacachep; |
4b51d669 | 130 | #endif |
2e892f43 CL |
131 | }; |
132 | extern struct cache_sizes malloc_sizes[]; | |
133 | ||
6193a2ff PM |
134 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t); |
135 | void *__kmalloc(size_t size, gfp_t flags); | |
136 | ||
0f24f128 | 137 | #ifdef CONFIG_TRACING |
36555751 EGM |
138 | extern void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags); |
139 | extern size_t slab_buffer_size(struct kmem_cache *cachep); | |
140 | #else | |
141 | static __always_inline void * | |
142 | kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags) | |
2e892f43 | 143 | { |
36555751 EGM |
144 | return kmem_cache_alloc(cachep, flags); |
145 | } | |
146 | static inline size_t slab_buffer_size(struct kmem_cache *cachep) | |
147 | { | |
148 | return 0; | |
149 | } | |
150 | #endif | |
151 | ||
152 | static __always_inline void *kmalloc(size_t size, gfp_t flags) | |
153 | { | |
154 | struct kmem_cache *cachep; | |
155 | void *ret; | |
156 | ||
2e892f43 CL |
157 | if (__builtin_constant_p(size)) { |
158 | int i = 0; | |
6cb8f913 CL |
159 | |
160 | if (!size) | |
161 | return ZERO_SIZE_PTR; | |
162 | ||
2e892f43 CL |
163 | #define CACHE(x) \ |
164 | if (size <= x) \ | |
165 | goto found; \ | |
166 | else \ | |
167 | i++; | |
1c61fc40 | 168 | #include <linux/kmalloc_sizes.h> |
2e892f43 | 169 | #undef CACHE |
1cf3eb2f | 170 | return NULL; |
2e892f43 | 171 | found: |
4b51d669 CL |
172 | #ifdef CONFIG_ZONE_DMA |
173 | if (flags & GFP_DMA) | |
36555751 EGM |
174 | cachep = malloc_sizes[i].cs_dmacachep; |
175 | else | |
4b51d669 | 176 | #endif |
36555751 EGM |
177 | cachep = malloc_sizes[i].cs_cachep; |
178 | ||
179 | ret = kmem_cache_alloc_notrace(cachep, flags); | |
180 | ||
ca2b84cb EGM |
181 | trace_kmalloc(_THIS_IP_, ret, |
182 | size, slab_buffer_size(cachep), flags); | |
36555751 EGM |
183 | |
184 | return ret; | |
2e892f43 CL |
185 | } |
186 | return __kmalloc(size, flags); | |
187 | } | |
188 | ||
2e892f43 CL |
189 | #ifdef CONFIG_NUMA |
190 | extern void *__kmalloc_node(size_t size, gfp_t flags, int node); | |
6193a2ff | 191 | extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); |
2e892f43 | 192 | |
0f24f128 | 193 | #ifdef CONFIG_TRACING |
36555751 EGM |
194 | extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep, |
195 | gfp_t flags, | |
196 | int nodeid); | |
197 | #else | |
198 | static __always_inline void * | |
199 | kmem_cache_alloc_node_notrace(struct kmem_cache *cachep, | |
200 | gfp_t flags, | |
201 | int nodeid) | |
202 | { | |
203 | return kmem_cache_alloc_node(cachep, flags, nodeid); | |
204 | } | |
205 | #endif | |
206 | ||
207 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) | |
2e892f43 | 208 | { |
36555751 EGM |
209 | struct kmem_cache *cachep; |
210 | void *ret; | |
211 | ||
2e892f43 CL |
212 | if (__builtin_constant_p(size)) { |
213 | int i = 0; | |
6cb8f913 CL |
214 | |
215 | if (!size) | |
216 | return ZERO_SIZE_PTR; | |
217 | ||
2e892f43 CL |
218 | #define CACHE(x) \ |
219 | if (size <= x) \ | |
220 | goto found; \ | |
221 | else \ | |
222 | i++; | |
1c61fc40 | 223 | #include <linux/kmalloc_sizes.h> |
2e892f43 | 224 | #undef CACHE |
1cf3eb2f | 225 | return NULL; |
2e892f43 | 226 | found: |
4b51d669 CL |
227 | #ifdef CONFIG_ZONE_DMA |
228 | if (flags & GFP_DMA) | |
36555751 EGM |
229 | cachep = malloc_sizes[i].cs_dmacachep; |
230 | else | |
4b51d669 | 231 | #endif |
36555751 EGM |
232 | cachep = malloc_sizes[i].cs_cachep; |
233 | ||
234 | ret = kmem_cache_alloc_node_notrace(cachep, flags, node); | |
235 | ||
ca2b84cb EGM |
236 | trace_kmalloc_node(_THIS_IP_, ret, |
237 | size, slab_buffer_size(cachep), | |
238 | flags, node); | |
36555751 EGM |
239 | |
240 | return ret; | |
2e892f43 CL |
241 | } |
242 | return __kmalloc_node(size, flags, node); | |
243 | } | |
244 | ||
245 | #endif /* CONFIG_NUMA */ | |
246 | ||
247 | #endif /* _LINUX_SLAB_DEF_H */ |