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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> | |
e4f7c0b4 | 13 | #include <linux/kmemleak.h> |
81819f0f | 14 | |
039ca4e7 LZ |
15 | #include <trace/events/kmem.h> |
16 | ||
8ff12cfc CL |
17 | enum stat_item { |
18 | ALLOC_FASTPATH, /* Allocation from cpu slab */ | |
19 | ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */ | |
20 | FREE_FASTPATH, /* Free to cpu slub */ | |
21 | FREE_SLOWPATH, /* Freeing not to cpu slab */ | |
22 | FREE_FROZEN, /* Freeing to frozen slab */ | |
23 | FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */ | |
24 | FREE_REMOVE_PARTIAL, /* Freeing removes last object */ | |
25 | ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */ | |
26 | ALLOC_SLAB, /* Cpu slab acquired from page allocator */ | |
27 | ALLOC_REFILL, /* Refill cpu slab from slab freelist */ | |
28 | FREE_SLAB, /* Slab freed to the page allocator */ | |
29 | CPUSLAB_FLUSH, /* Abandoning of the cpu slab */ | |
30 | DEACTIVATE_FULL, /* Cpu slab was full when deactivated */ | |
31 | DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */ | |
32 | DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */ | |
33 | DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */ | |
34 | DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */ | |
65c3376a | 35 | ORDER_FALLBACK, /* Number of times fallback was necessary */ |
8ff12cfc CL |
36 | NR_SLUB_STAT_ITEMS }; |
37 | ||
dfb4f096 | 38 | struct kmem_cache_cpu { |
da89b79e CL |
39 | void **freelist; /* Pointer to first free per cpu object */ |
40 | struct page *page; /* The slab from which we are allocating */ | |
41 | int node; /* The node of the page (or -1 for debug) */ | |
8ff12cfc CL |
42 | #ifdef CONFIG_SLUB_STATS |
43 | unsigned stat[NR_SLUB_STAT_ITEMS]; | |
44 | #endif | |
4c93c355 | 45 | }; |
dfb4f096 | 46 | |
81819f0f CL |
47 | struct kmem_cache_node { |
48 | spinlock_t list_lock; /* Protect partial list and nr_partial */ | |
49 | unsigned long nr_partial; | |
81819f0f | 50 | struct list_head partial; |
0c710013 | 51 | #ifdef CONFIG_SLUB_DEBUG |
0f389ec6 | 52 | atomic_long_t nr_slabs; |
205ab99d | 53 | atomic_long_t total_objects; |
643b1138 | 54 | struct list_head full; |
0c710013 | 55 | #endif |
81819f0f CL |
56 | }; |
57 | ||
834f3d11 CL |
58 | /* |
59 | * Word size structure that can be atomically updated or read and that | |
60 | * contains both the order and the number of objects that a slab of the | |
61 | * given order would contain. | |
62 | */ | |
63 | struct kmem_cache_order_objects { | |
64 | unsigned long x; | |
65 | }; | |
66 | ||
81819f0f CL |
67 | /* |
68 | * Slab cache management. | |
69 | */ | |
70 | struct kmem_cache { | |
1b5ad248 | 71 | struct kmem_cache_cpu __percpu *cpu_slab; |
81819f0f CL |
72 | /* Used for retriving partial slabs etc */ |
73 | unsigned long flags; | |
74 | int size; /* The size of an object including meta data */ | |
75 | int objsize; /* The size of an object without meta data */ | |
76 | int offset; /* Free pointer offset. */ | |
834f3d11 | 77 | struct kmem_cache_order_objects oo; |
81819f0f | 78 | |
81819f0f | 79 | /* Allocation and freeing of slabs */ |
205ab99d | 80 | struct kmem_cache_order_objects max; |
65c3376a | 81 | struct kmem_cache_order_objects min; |
b7a49f0d | 82 | gfp_t allocflags; /* gfp flags to use on each alloc */ |
81819f0f | 83 | int refcount; /* Refcount for slab cache destroy */ |
51cc5068 | 84 | void (*ctor)(void *); |
81819f0f CL |
85 | int inuse; /* Offset to metadata */ |
86 | int align; /* Alignment */ | |
3b89d7d8 | 87 | unsigned long min_partial; |
81819f0f CL |
88 | const char *name; /* Name (only for display!) */ |
89 | struct list_head list; /* List of slab caches */ | |
0c710013 | 90 | #ifdef CONFIG_SLUB_DEBUG |
81819f0f | 91 | struct kobject kobj; /* For sysfs */ |
0c710013 | 92 | #endif |
81819f0f CL |
93 | |
94 | #ifdef CONFIG_NUMA | |
9824601e CL |
95 | /* |
96 | * Defragmentation by allocating from a remote node. | |
97 | */ | |
98 | int remote_node_defrag_ratio; | |
81819f0f | 99 | struct kmem_cache_node *node[MAX_NUMNODES]; |
73367bd8 AD |
100 | #else |
101 | /* Avoid an extra cache line for UP */ | |
102 | struct kmem_cache_node local_node; | |
81819f0f | 103 | #endif |
81819f0f CL |
104 | }; |
105 | ||
106 | /* | |
107 | * Kmalloc subsystem. | |
108 | */ | |
a6eb9fe1 FT |
109 | #if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8 |
110 | #define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN | |
4b356be0 CL |
111 | #else |
112 | #define KMALLOC_MIN_SIZE 8 | |
113 | #endif | |
114 | ||
115 | #define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) | |
81819f0f | 116 | |
a6eb9fe1 FT |
117 | #ifdef ARCH_DMA_MINALIGN |
118 | #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN | |
119 | #else | |
4581ced3 DW |
120 | #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) |
121 | #endif | |
122 | ||
123 | #ifndef ARCH_SLAB_MINALIGN | |
124 | #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) | |
125 | #endif | |
126 | ||
ffadd4d0 CL |
127 | /* |
128 | * Maximum kmalloc object size handled by SLUB. Larger object allocations | |
129 | * are passed through to the page allocator. The page allocator "fastpath" | |
130 | * is relatively slow so we need this value sufficiently high so that | |
131 | * performance critical objects are allocated through the SLUB fastpath. | |
132 | * | |
133 | * This should be dropped to PAGE_SIZE / 2 once the page allocator | |
134 | * "fastpath" becomes competitive with the slab allocator fastpaths. | |
135 | */ | |
51735a7c | 136 | #define SLUB_MAX_SIZE (2 * PAGE_SIZE) |
ffadd4d0 | 137 | |
51735a7c | 138 | #define SLUB_PAGE_SHIFT (PAGE_SHIFT + 2) |
ffadd4d0 | 139 | |
756dee75 CL |
140 | #ifdef CONFIG_ZONE_DMA |
141 | #define SLUB_DMA __GFP_DMA | |
756dee75 CL |
142 | #else |
143 | /* Disable DMA functionality */ | |
144 | #define SLUB_DMA (__force gfp_t)0 | |
756dee75 CL |
145 | #endif |
146 | ||
81819f0f CL |
147 | /* |
148 | * We keep the general caches in an array of slab caches that are used for | |
149 | * 2^x bytes of allocations. | |
150 | */ | |
51df1142 | 151 | extern struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT]; |
81819f0f CL |
152 | |
153 | /* | |
154 | * Sorry that the following has to be that ugly but some versions of GCC | |
155 | * have trouble with constant propagation and loops. | |
156 | */ | |
aa137f9d | 157 | static __always_inline int kmalloc_index(size_t size) |
81819f0f | 158 | { |
272c1d21 CL |
159 | if (!size) |
160 | return 0; | |
614410d5 | 161 | |
4b356be0 CL |
162 | if (size <= KMALLOC_MIN_SIZE) |
163 | return KMALLOC_SHIFT_LOW; | |
164 | ||
acdfcd04 | 165 | if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96) |
81819f0f | 166 | return 1; |
acdfcd04 | 167 | if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192) |
81819f0f CL |
168 | return 2; |
169 | if (size <= 8) return 3; | |
170 | if (size <= 16) return 4; | |
171 | if (size <= 32) return 5; | |
172 | if (size <= 64) return 6; | |
173 | if (size <= 128) return 7; | |
174 | if (size <= 256) return 8; | |
175 | if (size <= 512) return 9; | |
176 | if (size <= 1024) return 10; | |
177 | if (size <= 2 * 1024) return 11; | |
6446faa2 | 178 | if (size <= 4 * 1024) return 12; |
aadb4bc4 CL |
179 | /* |
180 | * The following is only needed to support architectures with a larger page | |
181 | * size than 4k. | |
182 | */ | |
81819f0f CL |
183 | if (size <= 8 * 1024) return 13; |
184 | if (size <= 16 * 1024) return 14; | |
185 | if (size <= 32 * 1024) return 15; | |
186 | if (size <= 64 * 1024) return 16; | |
187 | if (size <= 128 * 1024) return 17; | |
188 | if (size <= 256 * 1024) return 18; | |
aadb4bc4 | 189 | if (size <= 512 * 1024) return 19; |
81819f0f | 190 | if (size <= 1024 * 1024) return 20; |
81819f0f | 191 | if (size <= 2 * 1024 * 1024) return 21; |
81819f0f CL |
192 | return -1; |
193 | ||
194 | /* | |
195 | * What we really wanted to do and cannot do because of compiler issues is: | |
196 | * int i; | |
197 | * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) | |
198 | * if (size <= (1 << i)) | |
199 | * return i; | |
200 | */ | |
201 | } | |
202 | ||
203 | /* | |
204 | * Find the slab cache for a given combination of allocation flags and size. | |
205 | * | |
206 | * This ought to end up with a global pointer to the right cache | |
207 | * in kmalloc_caches. | |
208 | */ | |
aa137f9d | 209 | static __always_inline struct kmem_cache *kmalloc_slab(size_t size) |
81819f0f CL |
210 | { |
211 | int index = kmalloc_index(size); | |
212 | ||
213 | if (index == 0) | |
214 | return NULL; | |
215 | ||
51df1142 | 216 | return kmalloc_caches[index]; |
81819f0f CL |
217 | } |
218 | ||
6193a2ff PM |
219 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t); |
220 | void *__kmalloc(size_t size, gfp_t flags); | |
221 | ||
0f24f128 | 222 | #ifdef CONFIG_TRACING |
5b882be4 EGM |
223 | extern void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags); |
224 | #else | |
225 | static __always_inline void * | |
226 | kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags) | |
227 | { | |
228 | return kmem_cache_alloc(s, gfpflags); | |
229 | } | |
230 | #endif | |
231 | ||
eada35ef PE |
232 | static __always_inline void *kmalloc_large(size_t size, gfp_t flags) |
233 | { | |
5b882be4 EGM |
234 | unsigned int order = get_order(size); |
235 | void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order); | |
236 | ||
e4f7c0b4 | 237 | kmemleak_alloc(ret, size, 1, flags); |
ca2b84cb | 238 | trace_kmalloc(_THIS_IP_, ret, size, PAGE_SIZE << order, flags); |
5b882be4 EGM |
239 | |
240 | return ret; | |
eada35ef PE |
241 | } |
242 | ||
aa137f9d | 243 | static __always_inline void *kmalloc(size_t size, gfp_t flags) |
81819f0f | 244 | { |
5b882be4 EGM |
245 | void *ret; |
246 | ||
aadb4bc4 | 247 | if (__builtin_constant_p(size)) { |
ffadd4d0 | 248 | if (size > SLUB_MAX_SIZE) |
eada35ef | 249 | return kmalloc_large(size, flags); |
81819f0f | 250 | |
aadb4bc4 CL |
251 | if (!(flags & SLUB_DMA)) { |
252 | struct kmem_cache *s = kmalloc_slab(size); | |
253 | ||
254 | if (!s) | |
255 | return ZERO_SIZE_PTR; | |
81819f0f | 256 | |
5b882be4 EGM |
257 | ret = kmem_cache_alloc_notrace(s, flags); |
258 | ||
ca2b84cb | 259 | trace_kmalloc(_THIS_IP_, ret, size, s->size, flags); |
5b882be4 EGM |
260 | |
261 | return ret; | |
aadb4bc4 CL |
262 | } |
263 | } | |
264 | return __kmalloc(size, flags); | |
81819f0f CL |
265 | } |
266 | ||
81819f0f | 267 | #ifdef CONFIG_NUMA |
6193a2ff PM |
268 | void *__kmalloc_node(size_t size, gfp_t flags, int node); |
269 | void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); | |
81819f0f | 270 | |
0f24f128 | 271 | #ifdef CONFIG_TRACING |
5b882be4 EGM |
272 | extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *s, |
273 | gfp_t gfpflags, | |
274 | int node); | |
275 | #else | |
276 | static __always_inline void * | |
277 | kmem_cache_alloc_node_notrace(struct kmem_cache *s, | |
278 | gfp_t gfpflags, | |
279 | int node) | |
280 | { | |
281 | return kmem_cache_alloc_node(s, gfpflags, node); | |
282 | } | |
283 | #endif | |
284 | ||
aa137f9d | 285 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
81819f0f | 286 | { |
5b882be4 EGM |
287 | void *ret; |
288 | ||
aadb4bc4 | 289 | if (__builtin_constant_p(size) && |
ffadd4d0 | 290 | size <= SLUB_MAX_SIZE && !(flags & SLUB_DMA)) { |
aadb4bc4 | 291 | struct kmem_cache *s = kmalloc_slab(size); |
81819f0f CL |
292 | |
293 | if (!s) | |
272c1d21 | 294 | return ZERO_SIZE_PTR; |
81819f0f | 295 | |
5b882be4 EGM |
296 | ret = kmem_cache_alloc_node_notrace(s, flags, node); |
297 | ||
ca2b84cb EGM |
298 | trace_kmalloc_node(_THIS_IP_, ret, |
299 | size, s->size, flags, node); | |
5b882be4 EGM |
300 | |
301 | return ret; | |
aadb4bc4 CL |
302 | } |
303 | return __kmalloc_node(size, flags, node); | |
81819f0f CL |
304 | } |
305 | #endif | |
306 | ||
307 | #endif /* _LINUX_SLUB_DEF_H */ |