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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 | ||
8ff12cfc CL |
14 | enum stat_item { |
15 | ALLOC_FASTPATH, /* Allocation from cpu slab */ | |
16 | ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */ | |
17 | FREE_FASTPATH, /* Free to cpu slub */ | |
18 | FREE_SLOWPATH, /* Freeing not to cpu slab */ | |
19 | FREE_FROZEN, /* Freeing to frozen slab */ | |
20 | FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */ | |
21 | FREE_REMOVE_PARTIAL, /* Freeing removes last object */ | |
22 | ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */ | |
23 | ALLOC_SLAB, /* Cpu slab acquired from page allocator */ | |
24 | ALLOC_REFILL, /* Refill cpu slab from slab freelist */ | |
25 | FREE_SLAB, /* Slab freed to the page allocator */ | |
26 | CPUSLAB_FLUSH, /* Abandoning of the cpu slab */ | |
27 | DEACTIVATE_FULL, /* Cpu slab was full when deactivated */ | |
28 | DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */ | |
29 | DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */ | |
30 | DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */ | |
31 | DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */ | |
65c3376a | 32 | ORDER_FALLBACK, /* Number of times fallback was necessary */ |
8ff12cfc CL |
33 | NR_SLUB_STAT_ITEMS }; |
34 | ||
dfb4f096 | 35 | struct kmem_cache_cpu { |
da89b79e CL |
36 | void **freelist; /* Pointer to first free per cpu object */ |
37 | struct page *page; /* The slab from which we are allocating */ | |
38 | int node; /* The node of the page (or -1 for debug) */ | |
39 | unsigned int offset; /* Freepointer offset (in word units) */ | |
40 | unsigned int objsize; /* Size of an object (from kmem_cache) */ | |
8ff12cfc CL |
41 | #ifdef CONFIG_SLUB_STATS |
42 | unsigned stat[NR_SLUB_STAT_ITEMS]; | |
43 | #endif | |
4c93c355 | 44 | }; |
dfb4f096 | 45 | |
81819f0f CL |
46 | struct kmem_cache_node { |
47 | spinlock_t list_lock; /* Protect partial list and nr_partial */ | |
48 | unsigned long nr_partial; | |
5595cffc | 49 | unsigned long min_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 { | |
71 | /* Used for retriving partial slabs etc */ | |
72 | unsigned long flags; | |
73 | int size; /* The size of an object including meta data */ | |
74 | int objsize; /* The size of an object without meta data */ | |
75 | int offset; /* Free pointer offset. */ | |
834f3d11 | 76 | struct kmem_cache_order_objects oo; |
81819f0f CL |
77 | |
78 | /* | |
79 | * Avoid an extra cache line for UP, SMP and for the node local to | |
80 | * struct kmem_cache. | |
81 | */ | |
82 | struct kmem_cache_node local_node; | |
83 | ||
84 | /* Allocation and freeing of slabs */ | |
205ab99d | 85 | struct kmem_cache_order_objects max; |
65c3376a | 86 | struct kmem_cache_order_objects min; |
b7a49f0d | 87 | gfp_t allocflags; /* gfp flags to use on each alloc */ |
81819f0f | 88 | int refcount; /* Refcount for slab cache destroy */ |
51cc5068 | 89 | void (*ctor)(void *); |
81819f0f CL |
90 | int inuse; /* Offset to metadata */ |
91 | int align; /* Alignment */ | |
92 | const char *name; /* Name (only for display!) */ | |
93 | struct list_head list; /* List of slab caches */ | |
0c710013 | 94 | #ifdef CONFIG_SLUB_DEBUG |
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 CL |
103 | struct kmem_cache_node *node[MAX_NUMNODES]; |
104 | #endif | |
4c93c355 CL |
105 | #ifdef CONFIG_SMP |
106 | struct kmem_cache_cpu *cpu_slab[NR_CPUS]; | |
107 | #else | |
108 | struct kmem_cache_cpu cpu_slab; | |
109 | #endif | |
81819f0f CL |
110 | }; |
111 | ||
112 | /* | |
113 | * Kmalloc subsystem. | |
114 | */ | |
4b356be0 CL |
115 | #if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8 |
116 | #define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN | |
117 | #else | |
118 | #define KMALLOC_MIN_SIZE 8 | |
119 | #endif | |
120 | ||
121 | #define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) | |
81819f0f | 122 | |
ffadd4d0 CL |
123 | /* |
124 | * Maximum kmalloc object size handled by SLUB. Larger object allocations | |
125 | * are passed through to the page allocator. The page allocator "fastpath" | |
126 | * is relatively slow so we need this value sufficiently high so that | |
127 | * performance critical objects are allocated through the SLUB fastpath. | |
128 | * | |
129 | * This should be dropped to PAGE_SIZE / 2 once the page allocator | |
130 | * "fastpath" becomes competitive with the slab allocator fastpaths. | |
131 | */ | |
132 | #define SLUB_MAX_SIZE (PAGE_SIZE) | |
133 | ||
134 | #define SLUB_PAGE_SHIFT (PAGE_SHIFT + 1) | |
135 | ||
81819f0f CL |
136 | /* |
137 | * We keep the general caches in an array of slab caches that are used for | |
138 | * 2^x bytes of allocations. | |
139 | */ | |
ffadd4d0 | 140 | extern struct kmem_cache kmalloc_caches[SLUB_PAGE_SHIFT]; |
81819f0f CL |
141 | |
142 | /* | |
143 | * Sorry that the following has to be that ugly but some versions of GCC | |
144 | * have trouble with constant propagation and loops. | |
145 | */ | |
aa137f9d | 146 | static __always_inline int kmalloc_index(size_t size) |
81819f0f | 147 | { |
272c1d21 CL |
148 | if (!size) |
149 | return 0; | |
614410d5 | 150 | |
4b356be0 CL |
151 | if (size <= KMALLOC_MIN_SIZE) |
152 | return KMALLOC_SHIFT_LOW; | |
153 | ||
41d54d3b | 154 | #if KMALLOC_MIN_SIZE <= 64 |
81819f0f CL |
155 | if (size > 64 && size <= 96) |
156 | return 1; | |
157 | if (size > 128 && size <= 192) | |
158 | return 2; | |
41d54d3b | 159 | #endif |
81819f0f CL |
160 | if (size <= 8) return 3; |
161 | if (size <= 16) return 4; | |
162 | if (size <= 32) return 5; | |
163 | if (size <= 64) return 6; | |
164 | if (size <= 128) return 7; | |
165 | if (size <= 256) return 8; | |
166 | if (size <= 512) return 9; | |
167 | if (size <= 1024) return 10; | |
168 | if (size <= 2 * 1024) return 11; | |
6446faa2 | 169 | if (size <= 4 * 1024) return 12; |
aadb4bc4 CL |
170 | /* |
171 | * The following is only needed to support architectures with a larger page | |
172 | * size than 4k. | |
173 | */ | |
81819f0f CL |
174 | if (size <= 8 * 1024) return 13; |
175 | if (size <= 16 * 1024) return 14; | |
176 | if (size <= 32 * 1024) return 15; | |
177 | if (size <= 64 * 1024) return 16; | |
178 | if (size <= 128 * 1024) return 17; | |
179 | if (size <= 256 * 1024) return 18; | |
aadb4bc4 | 180 | if (size <= 512 * 1024) return 19; |
81819f0f | 181 | if (size <= 1024 * 1024) return 20; |
81819f0f | 182 | if (size <= 2 * 1024 * 1024) return 21; |
81819f0f CL |
183 | return -1; |
184 | ||
185 | /* | |
186 | * What we really wanted to do and cannot do because of compiler issues is: | |
187 | * int i; | |
188 | * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) | |
189 | * if (size <= (1 << i)) | |
190 | * return i; | |
191 | */ | |
192 | } | |
193 | ||
194 | /* | |
195 | * Find the slab cache for a given combination of allocation flags and size. | |
196 | * | |
197 | * This ought to end up with a global pointer to the right cache | |
198 | * in kmalloc_caches. | |
199 | */ | |
aa137f9d | 200 | static __always_inline struct kmem_cache *kmalloc_slab(size_t size) |
81819f0f CL |
201 | { |
202 | int index = kmalloc_index(size); | |
203 | ||
204 | if (index == 0) | |
205 | return NULL; | |
206 | ||
81819f0f CL |
207 | return &kmalloc_caches[index]; |
208 | } | |
209 | ||
210 | #ifdef CONFIG_ZONE_DMA | |
211 | #define SLUB_DMA __GFP_DMA | |
212 | #else | |
213 | /* Disable DMA functionality */ | |
d046943c | 214 | #define SLUB_DMA (__force gfp_t)0 |
81819f0f CL |
215 | #endif |
216 | ||
6193a2ff PM |
217 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t); |
218 | void *__kmalloc(size_t size, gfp_t flags); | |
219 | ||
eada35ef PE |
220 | static __always_inline void *kmalloc_large(size_t size, gfp_t flags) |
221 | { | |
222 | return (void *)__get_free_pages(flags | __GFP_COMP, get_order(size)); | |
223 | } | |
224 | ||
aa137f9d | 225 | static __always_inline void *kmalloc(size_t size, gfp_t flags) |
81819f0f | 226 | { |
aadb4bc4 | 227 | if (__builtin_constant_p(size)) { |
ffadd4d0 | 228 | if (size > SLUB_MAX_SIZE) |
eada35ef | 229 | return kmalloc_large(size, flags); |
81819f0f | 230 | |
aadb4bc4 CL |
231 | if (!(flags & SLUB_DMA)) { |
232 | struct kmem_cache *s = kmalloc_slab(size); | |
233 | ||
234 | if (!s) | |
235 | return ZERO_SIZE_PTR; | |
81819f0f | 236 | |
aadb4bc4 CL |
237 | return kmem_cache_alloc(s, flags); |
238 | } | |
239 | } | |
240 | return __kmalloc(size, flags); | |
81819f0f CL |
241 | } |
242 | ||
81819f0f | 243 | #ifdef CONFIG_NUMA |
6193a2ff PM |
244 | void *__kmalloc_node(size_t size, gfp_t flags, int node); |
245 | void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); | |
81819f0f | 246 | |
aa137f9d | 247 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
81819f0f | 248 | { |
aadb4bc4 | 249 | if (__builtin_constant_p(size) && |
ffadd4d0 | 250 | size <= SLUB_MAX_SIZE && !(flags & SLUB_DMA)) { |
aadb4bc4 | 251 | struct kmem_cache *s = kmalloc_slab(size); |
81819f0f CL |
252 | |
253 | if (!s) | |
272c1d21 | 254 | return ZERO_SIZE_PTR; |
81819f0f CL |
255 | |
256 | return kmem_cache_alloc_node(s, flags, node); | |
aadb4bc4 CL |
257 | } |
258 | return __kmalloc_node(size, flags, node); | |
81819f0f CL |
259 | } |
260 | #endif | |
261 | ||
262 | #endif /* _LINUX_SLUB_DEF_H */ |