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81819f0f CL |
1 | #ifndef _LINUX_SLUB_DEF_H |
2 | #define _LINUX_SLUB_DEF_H | |
3 | ||
4 | /* | |
5 | * SLUB : A Slab allocator without object queues. | |
6 | * | |
cde53535 | 7 | * (C) 2007 SGI, Christoph Lameter |
81819f0f CL |
8 | */ |
9 | #include <linux/types.h> | |
10 | #include <linux/gfp.h> | |
11 | #include <linux/workqueue.h> | |
12 | #include <linux/kobject.h> | |
13 | ||
4a92379b | 14 | #include <linux/kmemleak.h> |
039ca4e7 | 15 | |
8ff12cfc CL |
16 | enum stat_item { |
17 | ALLOC_FASTPATH, /* Allocation from cpu slab */ | |
18 | ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */ | |
19 | FREE_FASTPATH, /* Free to cpu slub */ | |
20 | FREE_SLOWPATH, /* Freeing not to cpu slab */ | |
21 | FREE_FROZEN, /* Freeing to frozen slab */ | |
22 | FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */ | |
23 | FREE_REMOVE_PARTIAL, /* Freeing removes last object */ | |
24 | ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */ | |
25 | ALLOC_SLAB, /* Cpu slab acquired from page allocator */ | |
26 | ALLOC_REFILL, /* Refill cpu slab from slab freelist */ | |
27 | FREE_SLAB, /* Slab freed to the page allocator */ | |
28 | CPUSLAB_FLUSH, /* Abandoning of the cpu slab */ | |
29 | DEACTIVATE_FULL, /* Cpu slab was full when deactivated */ | |
30 | DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */ | |
31 | DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */ | |
32 | DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */ | |
33 | DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */ | |
65c3376a | 34 | ORDER_FALLBACK, /* Number of times fallback was necessary */ |
4fdccdfb | 35 | CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */ |
8ff12cfc CL |
36 | NR_SLUB_STAT_ITEMS }; |
37 | ||
dfb4f096 | 38 | struct kmem_cache_cpu { |
8a5ec0ba CL |
39 | void **freelist; /* Pointer to next available object */ |
40 | #ifdef CONFIG_CMPXCHG_LOCAL | |
41 | unsigned long tid; /* Globally unique transaction id */ | |
42 | #endif | |
da89b79e CL |
43 | struct page *page; /* The slab from which we are allocating */ |
44 | int node; /* The node of the page (or -1 for debug) */ | |
8ff12cfc CL |
45 | #ifdef CONFIG_SLUB_STATS |
46 | unsigned stat[NR_SLUB_STAT_ITEMS]; | |
47 | #endif | |
4c93c355 | 48 | }; |
dfb4f096 | 49 | |
81819f0f CL |
50 | struct kmem_cache_node { |
51 | spinlock_t list_lock; /* Protect partial list and nr_partial */ | |
52 | unsigned long nr_partial; | |
81819f0f | 53 | struct list_head partial; |
0c710013 | 54 | #ifdef CONFIG_SLUB_DEBUG |
0f389ec6 | 55 | atomic_long_t nr_slabs; |
205ab99d | 56 | atomic_long_t total_objects; |
643b1138 | 57 | struct list_head full; |
0c710013 | 58 | #endif |
81819f0f CL |
59 | }; |
60 | ||
834f3d11 CL |
61 | /* |
62 | * Word size structure that can be atomically updated or read and that | |
63 | * contains both the order and the number of objects that a slab of the | |
64 | * given order would contain. | |
65 | */ | |
66 | struct kmem_cache_order_objects { | |
67 | unsigned long x; | |
68 | }; | |
69 | ||
81819f0f CL |
70 | /* |
71 | * Slab cache management. | |
72 | */ | |
73 | struct kmem_cache { | |
1b5ad248 | 74 | struct kmem_cache_cpu __percpu *cpu_slab; |
81819f0f CL |
75 | /* Used for retriving partial slabs etc */ |
76 | unsigned long flags; | |
1a757fe5 | 77 | unsigned long min_partial; |
81819f0f CL |
78 | int size; /* The size of an object including meta data */ |
79 | int objsize; /* The size of an object without meta data */ | |
80 | int offset; /* Free pointer offset. */ | |
834f3d11 | 81 | struct kmem_cache_order_objects oo; |
81819f0f | 82 | |
81819f0f | 83 | /* Allocation and freeing of slabs */ |
205ab99d | 84 | struct kmem_cache_order_objects max; |
65c3376a | 85 | struct kmem_cache_order_objects min; |
b7a49f0d | 86 | gfp_t allocflags; /* gfp flags to use on each alloc */ |
81819f0f | 87 | int refcount; /* Refcount for slab cache destroy */ |
51cc5068 | 88 | void (*ctor)(void *); |
81819f0f CL |
89 | int inuse; /* Offset to metadata */ |
90 | int align; /* Alignment */ | |
ab9a0f19 | 91 | int reserved; /* Reserved bytes at the end of slabs */ |
81819f0f CL |
92 | const char *name; /* Name (only for display!) */ |
93 | struct list_head list; /* List of slab caches */ | |
ab4d5ed5 | 94 | #ifdef CONFIG_SYSFS |
81819f0f | 95 | struct kobject kobj; /* For sysfs */ |
0c710013 | 96 | #endif |
81819f0f CL |
97 | |
98 | #ifdef CONFIG_NUMA | |
9824601e CL |
99 | /* |
100 | * Defragmentation by allocating from a remote node. | |
101 | */ | |
102 | int remote_node_defrag_ratio; | |
81819f0f | 103 | #endif |
7340cc84 | 104 | struct kmem_cache_node *node[MAX_NUMNODES]; |
81819f0f CL |
105 | }; |
106 | ||
107 | /* | |
108 | * Kmalloc subsystem. | |
109 | */ | |
a6eb9fe1 FT |
110 | #if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8 |
111 | #define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN | |
4b356be0 CL |
112 | #else |
113 | #define KMALLOC_MIN_SIZE 8 | |
114 | #endif | |
115 | ||
116 | #define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) | |
81819f0f | 117 | |
a6eb9fe1 FT |
118 | #ifdef ARCH_DMA_MINALIGN |
119 | #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN | |
120 | #else | |
4581ced3 DW |
121 | #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) |
122 | #endif | |
123 | ||
124 | #ifndef ARCH_SLAB_MINALIGN | |
125 | #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) | |
126 | #endif | |
127 | ||
ffadd4d0 CL |
128 | /* |
129 | * Maximum kmalloc object size handled by SLUB. Larger object allocations | |
130 | * are passed through to the page allocator. The page allocator "fastpath" | |
131 | * is relatively slow so we need this value sufficiently high so that | |
132 | * performance critical objects are allocated through the SLUB fastpath. | |
133 | * | |
134 | * This should be dropped to PAGE_SIZE / 2 once the page allocator | |
135 | * "fastpath" becomes competitive with the slab allocator fastpaths. | |
136 | */ | |
51735a7c | 137 | #define SLUB_MAX_SIZE (2 * PAGE_SIZE) |
ffadd4d0 | 138 | |
51735a7c | 139 | #define SLUB_PAGE_SHIFT (PAGE_SHIFT + 2) |
ffadd4d0 | 140 | |
756dee75 CL |
141 | #ifdef CONFIG_ZONE_DMA |
142 | #define SLUB_DMA __GFP_DMA | |
756dee75 CL |
143 | #else |
144 | /* Disable DMA functionality */ | |
145 | #define SLUB_DMA (__force gfp_t)0 | |
756dee75 CL |
146 | #endif |
147 | ||
81819f0f CL |
148 | /* |
149 | * We keep the general caches in an array of slab caches that are used for | |
150 | * 2^x bytes of allocations. | |
151 | */ | |
51df1142 | 152 | extern struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT]; |
81819f0f CL |
153 | |
154 | /* | |
155 | * Sorry that the following has to be that ugly but some versions of GCC | |
156 | * have trouble with constant propagation and loops. | |
157 | */ | |
aa137f9d | 158 | static __always_inline int kmalloc_index(size_t size) |
81819f0f | 159 | { |
272c1d21 CL |
160 | if (!size) |
161 | return 0; | |
614410d5 | 162 | |
4b356be0 CL |
163 | if (size <= KMALLOC_MIN_SIZE) |
164 | return KMALLOC_SHIFT_LOW; | |
165 | ||
acdfcd04 | 166 | if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96) |
81819f0f | 167 | return 1; |
acdfcd04 | 168 | if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192) |
81819f0f CL |
169 | return 2; |
170 | if (size <= 8) return 3; | |
171 | if (size <= 16) return 4; | |
172 | if (size <= 32) return 5; | |
173 | if (size <= 64) return 6; | |
174 | if (size <= 128) return 7; | |
175 | if (size <= 256) return 8; | |
176 | if (size <= 512) return 9; | |
177 | if (size <= 1024) return 10; | |
178 | if (size <= 2 * 1024) return 11; | |
6446faa2 | 179 | if (size <= 4 * 1024) return 12; |
aadb4bc4 CL |
180 | /* |
181 | * The following is only needed to support architectures with a larger page | |
182 | * size than 4k. | |
183 | */ | |
81819f0f CL |
184 | if (size <= 8 * 1024) return 13; |
185 | if (size <= 16 * 1024) return 14; | |
186 | if (size <= 32 * 1024) return 15; | |
187 | if (size <= 64 * 1024) return 16; | |
188 | if (size <= 128 * 1024) return 17; | |
189 | if (size <= 256 * 1024) return 18; | |
aadb4bc4 | 190 | if (size <= 512 * 1024) return 19; |
81819f0f | 191 | if (size <= 1024 * 1024) return 20; |
81819f0f | 192 | if (size <= 2 * 1024 * 1024) return 21; |
81819f0f CL |
193 | return -1; |
194 | ||
195 | /* | |
196 | * What we really wanted to do and cannot do because of compiler issues is: | |
197 | * int i; | |
198 | * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) | |
199 | * if (size <= (1 << i)) | |
200 | * return i; | |
201 | */ | |
202 | } | |
203 | ||
204 | /* | |
205 | * Find the slab cache for a given combination of allocation flags and size. | |
206 | * | |
207 | * This ought to end up with a global pointer to the right cache | |
208 | * in kmalloc_caches. | |
209 | */ | |
aa137f9d | 210 | static __always_inline struct kmem_cache *kmalloc_slab(size_t size) |
81819f0f CL |
211 | { |
212 | int index = kmalloc_index(size); | |
213 | ||
214 | if (index == 0) | |
215 | return NULL; | |
216 | ||
51df1142 | 217 | return kmalloc_caches[index]; |
81819f0f CL |
218 | } |
219 | ||
6193a2ff PM |
220 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t); |
221 | void *__kmalloc(size_t size, gfp_t flags); | |
222 | ||
4a92379b RK |
223 | static __always_inline void * |
224 | kmalloc_order(size_t size, gfp_t flags, unsigned int order) | |
225 | { | |
226 | void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order); | |
227 | kmemleak_alloc(ret, size, 1, flags); | |
228 | return ret; | |
229 | } | |
230 | ||
0f24f128 | 231 | #ifdef CONFIG_TRACING |
4a92379b RK |
232 | extern void * |
233 | kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size); | |
234 | extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order); | |
5b882be4 EGM |
235 | #else |
236 | static __always_inline void * | |
4a92379b | 237 | kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size) |
5b882be4 EGM |
238 | { |
239 | return kmem_cache_alloc(s, gfpflags); | |
240 | } | |
4a92379b RK |
241 | |
242 | static __always_inline void * | |
243 | kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) | |
244 | { | |
245 | return kmalloc_order(size, flags, order); | |
246 | } | |
5b882be4 EGM |
247 | #endif |
248 | ||
eada35ef PE |
249 | static __always_inline void *kmalloc_large(size_t size, gfp_t flags) |
250 | { | |
5b882be4 | 251 | unsigned int order = get_order(size); |
4a92379b | 252 | return kmalloc_order_trace(size, flags, order); |
eada35ef PE |
253 | } |
254 | ||
aa137f9d | 255 | static __always_inline void *kmalloc(size_t size, gfp_t flags) |
81819f0f | 256 | { |
aadb4bc4 | 257 | if (__builtin_constant_p(size)) { |
ffadd4d0 | 258 | if (size > SLUB_MAX_SIZE) |
eada35ef | 259 | return kmalloc_large(size, flags); |
81819f0f | 260 | |
aadb4bc4 CL |
261 | if (!(flags & SLUB_DMA)) { |
262 | struct kmem_cache *s = kmalloc_slab(size); | |
263 | ||
264 | if (!s) | |
265 | return ZERO_SIZE_PTR; | |
81819f0f | 266 | |
4a92379b | 267 | return kmem_cache_alloc_trace(s, flags, size); |
aadb4bc4 CL |
268 | } |
269 | } | |
270 | return __kmalloc(size, flags); | |
81819f0f CL |
271 | } |
272 | ||
81819f0f | 273 | #ifdef CONFIG_NUMA |
6193a2ff PM |
274 | void *__kmalloc_node(size_t size, gfp_t flags, int node); |
275 | void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); | |
81819f0f | 276 | |
0f24f128 | 277 | #ifdef CONFIG_TRACING |
4a92379b | 278 | extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
5b882be4 | 279 | gfp_t gfpflags, |
4a92379b | 280 | int node, size_t size); |
5b882be4 EGM |
281 | #else |
282 | static __always_inline void * | |
4a92379b | 283 | kmem_cache_alloc_node_trace(struct kmem_cache *s, |
5b882be4 | 284 | gfp_t gfpflags, |
4a92379b | 285 | int node, size_t size) |
5b882be4 EGM |
286 | { |
287 | return kmem_cache_alloc_node(s, gfpflags, node); | |
288 | } | |
289 | #endif | |
290 | ||
aa137f9d | 291 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
81819f0f | 292 | { |
aadb4bc4 | 293 | if (__builtin_constant_p(size) && |
ffadd4d0 | 294 | size <= SLUB_MAX_SIZE && !(flags & SLUB_DMA)) { |
aadb4bc4 | 295 | struct kmem_cache *s = kmalloc_slab(size); |
81819f0f CL |
296 | |
297 | if (!s) | |
272c1d21 | 298 | return ZERO_SIZE_PTR; |
81819f0f | 299 | |
4a92379b | 300 | return kmem_cache_alloc_node_trace(s, flags, node, size); |
aadb4bc4 CL |
301 | } |
302 | return __kmalloc_node(size, flags, node); | |
81819f0f CL |
303 | } |
304 | #endif | |
305 | ||
306 | #endif /* _LINUX_SLUB_DEF_H */ |