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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 | * | |
7 | * (C) 2007 SGI, Christoph Lameter <clameter@sgi.com> | |
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 */ | |
32 | NR_SLUB_STAT_ITEMS }; | |
33 | ||
dfb4f096 | 34 | struct kmem_cache_cpu { |
da89b79e CL |
35 | void **freelist; /* Pointer to first free per cpu object */ |
36 | struct page *page; /* The slab from which we are allocating */ | |
37 | int node; /* The node of the page (or -1 for debug) */ | |
38 | unsigned int offset; /* Freepointer offset (in word units) */ | |
39 | unsigned int objsize; /* Size of an object (from kmem_cache) */ | |
8ff12cfc CL |
40 | #ifdef CONFIG_SLUB_STATS |
41 | unsigned stat[NR_SLUB_STAT_ITEMS]; | |
42 | #endif | |
4c93c355 | 43 | }; |
dfb4f096 | 44 | |
81819f0f CL |
45 | struct kmem_cache_node { |
46 | spinlock_t list_lock; /* Protect partial list and nr_partial */ | |
47 | unsigned long nr_partial; | |
48 | atomic_long_t nr_slabs; | |
49 | struct list_head partial; | |
0c710013 | 50 | #ifdef CONFIG_SLUB_DEBUG |
643b1138 | 51 | struct list_head full; |
0c710013 | 52 | #endif |
81819f0f CL |
53 | }; |
54 | ||
55 | /* | |
56 | * Slab cache management. | |
57 | */ | |
58 | struct kmem_cache { | |
59 | /* Used for retriving partial slabs etc */ | |
60 | unsigned long flags; | |
61 | int size; /* The size of an object including meta data */ | |
62 | int objsize; /* The size of an object without meta data */ | |
63 | int offset; /* Free pointer offset. */ | |
4b356be0 | 64 | int order; |
81819f0f CL |
65 | |
66 | /* | |
67 | * Avoid an extra cache line for UP, SMP and for the node local to | |
68 | * struct kmem_cache. | |
69 | */ | |
70 | struct kmem_cache_node local_node; | |
71 | ||
72 | /* Allocation and freeing of slabs */ | |
73 | int objects; /* Number of objects in slab */ | |
b7a49f0d | 74 | gfp_t allocflags; /* gfp flags to use on each alloc */ |
81819f0f | 75 | int refcount; /* Refcount for slab cache destroy */ |
4ba9b9d0 | 76 | void (*ctor)(struct kmem_cache *, void *); |
81819f0f CL |
77 | int inuse; /* Offset to metadata */ |
78 | int align; /* Alignment */ | |
79 | const char *name; /* Name (only for display!) */ | |
80 | struct list_head list; /* List of slab caches */ | |
0c710013 | 81 | #ifdef CONFIG_SLUB_DEBUG |
81819f0f | 82 | struct kobject kobj; /* For sysfs */ |
0c710013 | 83 | #endif |
81819f0f CL |
84 | |
85 | #ifdef CONFIG_NUMA | |
9824601e CL |
86 | /* |
87 | * Defragmentation by allocating from a remote node. | |
88 | */ | |
89 | int remote_node_defrag_ratio; | |
81819f0f CL |
90 | struct kmem_cache_node *node[MAX_NUMNODES]; |
91 | #endif | |
4c93c355 CL |
92 | #ifdef CONFIG_SMP |
93 | struct kmem_cache_cpu *cpu_slab[NR_CPUS]; | |
94 | #else | |
95 | struct kmem_cache_cpu cpu_slab; | |
96 | #endif | |
81819f0f CL |
97 | }; |
98 | ||
99 | /* | |
100 | * Kmalloc subsystem. | |
101 | */ | |
4b356be0 CL |
102 | #if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8 |
103 | #define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN | |
104 | #else | |
105 | #define KMALLOC_MIN_SIZE 8 | |
106 | #endif | |
107 | ||
108 | #define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) | |
81819f0f | 109 | |
81819f0f CL |
110 | /* |
111 | * We keep the general caches in an array of slab caches that are used for | |
112 | * 2^x bytes of allocations. | |
113 | */ | |
aadb4bc4 | 114 | extern struct kmem_cache kmalloc_caches[PAGE_SHIFT]; |
81819f0f CL |
115 | |
116 | /* | |
117 | * Sorry that the following has to be that ugly but some versions of GCC | |
118 | * have trouble with constant propagation and loops. | |
119 | */ | |
aa137f9d | 120 | static __always_inline int kmalloc_index(size_t size) |
81819f0f | 121 | { |
272c1d21 CL |
122 | if (!size) |
123 | return 0; | |
614410d5 | 124 | |
4b356be0 CL |
125 | if (size <= KMALLOC_MIN_SIZE) |
126 | return KMALLOC_SHIFT_LOW; | |
127 | ||
81819f0f CL |
128 | if (size > 64 && size <= 96) |
129 | return 1; | |
130 | if (size > 128 && size <= 192) | |
131 | return 2; | |
132 | if (size <= 8) return 3; | |
133 | if (size <= 16) return 4; | |
134 | if (size <= 32) return 5; | |
135 | if (size <= 64) return 6; | |
136 | if (size <= 128) return 7; | |
137 | if (size <= 256) return 8; | |
138 | if (size <= 512) return 9; | |
139 | if (size <= 1024) return 10; | |
140 | if (size <= 2 * 1024) return 11; | |
aadb4bc4 CL |
141 | /* |
142 | * The following is only needed to support architectures with a larger page | |
143 | * size than 4k. | |
144 | */ | |
81819f0f CL |
145 | if (size <= 4 * 1024) return 12; |
146 | if (size <= 8 * 1024) return 13; | |
147 | if (size <= 16 * 1024) return 14; | |
148 | if (size <= 32 * 1024) return 15; | |
149 | if (size <= 64 * 1024) return 16; | |
150 | if (size <= 128 * 1024) return 17; | |
151 | if (size <= 256 * 1024) return 18; | |
aadb4bc4 | 152 | if (size <= 512 * 1024) return 19; |
81819f0f | 153 | if (size <= 1024 * 1024) return 20; |
81819f0f | 154 | if (size <= 2 * 1024 * 1024) return 21; |
81819f0f CL |
155 | return -1; |
156 | ||
157 | /* | |
158 | * What we really wanted to do and cannot do because of compiler issues is: | |
159 | * int i; | |
160 | * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) | |
161 | * if (size <= (1 << i)) | |
162 | * return i; | |
163 | */ | |
164 | } | |
165 | ||
166 | /* | |
167 | * Find the slab cache for a given combination of allocation flags and size. | |
168 | * | |
169 | * This ought to end up with a global pointer to the right cache | |
170 | * in kmalloc_caches. | |
171 | */ | |
aa137f9d | 172 | static __always_inline struct kmem_cache *kmalloc_slab(size_t size) |
81819f0f CL |
173 | { |
174 | int index = kmalloc_index(size); | |
175 | ||
176 | if (index == 0) | |
177 | return NULL; | |
178 | ||
81819f0f CL |
179 | return &kmalloc_caches[index]; |
180 | } | |
181 | ||
182 | #ifdef CONFIG_ZONE_DMA | |
183 | #define SLUB_DMA __GFP_DMA | |
184 | #else | |
185 | /* Disable DMA functionality */ | |
d046943c | 186 | #define SLUB_DMA (__force gfp_t)0 |
81819f0f CL |
187 | #endif |
188 | ||
6193a2ff PM |
189 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t); |
190 | void *__kmalloc(size_t size, gfp_t flags); | |
191 | ||
eada35ef PE |
192 | static __always_inline void *kmalloc_large(size_t size, gfp_t flags) |
193 | { | |
194 | return (void *)__get_free_pages(flags | __GFP_COMP, get_order(size)); | |
195 | } | |
196 | ||
aa137f9d | 197 | static __always_inline void *kmalloc(size_t size, gfp_t flags) |
81819f0f | 198 | { |
aadb4bc4 CL |
199 | if (__builtin_constant_p(size)) { |
200 | if (size > PAGE_SIZE / 2) | |
eada35ef | 201 | return kmalloc_large(size, flags); |
81819f0f | 202 | |
aadb4bc4 CL |
203 | if (!(flags & SLUB_DMA)) { |
204 | struct kmem_cache *s = kmalloc_slab(size); | |
205 | ||
206 | if (!s) | |
207 | return ZERO_SIZE_PTR; | |
81819f0f | 208 | |
aadb4bc4 CL |
209 | return kmem_cache_alloc(s, flags); |
210 | } | |
211 | } | |
212 | return __kmalloc(size, flags); | |
81819f0f CL |
213 | } |
214 | ||
81819f0f | 215 | #ifdef CONFIG_NUMA |
6193a2ff PM |
216 | void *__kmalloc_node(size_t size, gfp_t flags, int node); |
217 | void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); | |
81819f0f | 218 | |
aa137f9d | 219 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
81819f0f | 220 | { |
aadb4bc4 CL |
221 | if (__builtin_constant_p(size) && |
222 | size <= PAGE_SIZE / 2 && !(flags & SLUB_DMA)) { | |
223 | struct kmem_cache *s = kmalloc_slab(size); | |
81819f0f CL |
224 | |
225 | if (!s) | |
272c1d21 | 226 | return ZERO_SIZE_PTR; |
81819f0f CL |
227 | |
228 | return kmem_cache_alloc_node(s, flags, node); | |
aadb4bc4 CL |
229 | } |
230 | return __kmalloc_node(size, flags, node); | |
81819f0f CL |
231 | } |
232 | #endif | |
233 | ||
234 | #endif /* _LINUX_SLUB_DEF_H */ |