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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 | ||
dfb4f096 CL |
14 | struct kmem_cache_cpu { |
15 | void **freelist; | |
16 | struct page *page; | |
17 | int node; | |
b3fba8da | 18 | unsigned int offset; |
4c93c355 | 19 | }; |
dfb4f096 | 20 | |
81819f0f CL |
21 | struct kmem_cache_node { |
22 | spinlock_t list_lock; /* Protect partial list and nr_partial */ | |
23 | unsigned long nr_partial; | |
24 | atomic_long_t nr_slabs; | |
25 | struct list_head partial; | |
0c710013 | 26 | #ifdef CONFIG_SLUB_DEBUG |
643b1138 | 27 | struct list_head full; |
0c710013 | 28 | #endif |
81819f0f CL |
29 | }; |
30 | ||
31 | /* | |
32 | * Slab cache management. | |
33 | */ | |
34 | struct kmem_cache { | |
35 | /* Used for retriving partial slabs etc */ | |
36 | unsigned long flags; | |
37 | int size; /* The size of an object including meta data */ | |
38 | int objsize; /* The size of an object without meta data */ | |
39 | int offset; /* Free pointer offset. */ | |
4b356be0 | 40 | int order; |
81819f0f CL |
41 | |
42 | /* | |
43 | * Avoid an extra cache line for UP, SMP and for the node local to | |
44 | * struct kmem_cache. | |
45 | */ | |
46 | struct kmem_cache_node local_node; | |
47 | ||
48 | /* Allocation and freeing of slabs */ | |
49 | int objects; /* Number of objects in slab */ | |
50 | int refcount; /* Refcount for slab cache destroy */ | |
51 | void (*ctor)(void *, struct kmem_cache *, unsigned long); | |
81819f0f CL |
52 | int inuse; /* Offset to metadata */ |
53 | int align; /* Alignment */ | |
54 | const char *name; /* Name (only for display!) */ | |
55 | struct list_head list; /* List of slab caches */ | |
0c710013 | 56 | #ifdef CONFIG_SLUB_DEBUG |
81819f0f | 57 | struct kobject kobj; /* For sysfs */ |
0c710013 | 58 | #endif |
81819f0f CL |
59 | |
60 | #ifdef CONFIG_NUMA | |
61 | int defrag_ratio; | |
62 | struct kmem_cache_node *node[MAX_NUMNODES]; | |
63 | #endif | |
4c93c355 CL |
64 | #ifdef CONFIG_SMP |
65 | struct kmem_cache_cpu *cpu_slab[NR_CPUS]; | |
66 | #else | |
67 | struct kmem_cache_cpu cpu_slab; | |
68 | #endif | |
81819f0f CL |
69 | }; |
70 | ||
71 | /* | |
72 | * Kmalloc subsystem. | |
73 | */ | |
4b356be0 CL |
74 | #if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8 |
75 | #define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN | |
76 | #else | |
77 | #define KMALLOC_MIN_SIZE 8 | |
78 | #endif | |
79 | ||
80 | #define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) | |
81819f0f | 81 | |
81819f0f CL |
82 | /* |
83 | * We keep the general caches in an array of slab caches that are used for | |
84 | * 2^x bytes of allocations. | |
85 | */ | |
aadb4bc4 | 86 | extern struct kmem_cache kmalloc_caches[PAGE_SHIFT]; |
81819f0f CL |
87 | |
88 | /* | |
89 | * Sorry that the following has to be that ugly but some versions of GCC | |
90 | * have trouble with constant propagation and loops. | |
91 | */ | |
aa137f9d | 92 | static __always_inline int kmalloc_index(size_t size) |
81819f0f | 93 | { |
272c1d21 CL |
94 | if (!size) |
95 | return 0; | |
614410d5 | 96 | |
4b356be0 CL |
97 | if (size <= KMALLOC_MIN_SIZE) |
98 | return KMALLOC_SHIFT_LOW; | |
99 | ||
81819f0f CL |
100 | if (size > 64 && size <= 96) |
101 | return 1; | |
102 | if (size > 128 && size <= 192) | |
103 | return 2; | |
104 | if (size <= 8) return 3; | |
105 | if (size <= 16) return 4; | |
106 | if (size <= 32) return 5; | |
107 | if (size <= 64) return 6; | |
108 | if (size <= 128) return 7; | |
109 | if (size <= 256) return 8; | |
110 | if (size <= 512) return 9; | |
111 | if (size <= 1024) return 10; | |
112 | if (size <= 2 * 1024) return 11; | |
aadb4bc4 CL |
113 | /* |
114 | * The following is only needed to support architectures with a larger page | |
115 | * size than 4k. | |
116 | */ | |
81819f0f CL |
117 | if (size <= 4 * 1024) return 12; |
118 | if (size <= 8 * 1024) return 13; | |
119 | if (size <= 16 * 1024) return 14; | |
120 | if (size <= 32 * 1024) return 15; | |
121 | if (size <= 64 * 1024) return 16; | |
122 | if (size <= 128 * 1024) return 17; | |
123 | if (size <= 256 * 1024) return 18; | |
aadb4bc4 | 124 | if (size <= 512 * 1024) return 19; |
81819f0f | 125 | if (size <= 1024 * 1024) return 20; |
81819f0f | 126 | if (size <= 2 * 1024 * 1024) return 21; |
81819f0f CL |
127 | return -1; |
128 | ||
129 | /* | |
130 | * What we really wanted to do and cannot do because of compiler issues is: | |
131 | * int i; | |
132 | * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) | |
133 | * if (size <= (1 << i)) | |
134 | * return i; | |
135 | */ | |
136 | } | |
137 | ||
138 | /* | |
139 | * Find the slab cache for a given combination of allocation flags and size. | |
140 | * | |
141 | * This ought to end up with a global pointer to the right cache | |
142 | * in kmalloc_caches. | |
143 | */ | |
aa137f9d | 144 | static __always_inline struct kmem_cache *kmalloc_slab(size_t size) |
81819f0f CL |
145 | { |
146 | int index = kmalloc_index(size); | |
147 | ||
148 | if (index == 0) | |
149 | return NULL; | |
150 | ||
81819f0f CL |
151 | return &kmalloc_caches[index]; |
152 | } | |
153 | ||
154 | #ifdef CONFIG_ZONE_DMA | |
155 | #define SLUB_DMA __GFP_DMA | |
156 | #else | |
157 | /* Disable DMA functionality */ | |
d046943c | 158 | #define SLUB_DMA (__force gfp_t)0 |
81819f0f CL |
159 | #endif |
160 | ||
6193a2ff PM |
161 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t); |
162 | void *__kmalloc(size_t size, gfp_t flags); | |
163 | ||
aa137f9d | 164 | static __always_inline void *kmalloc(size_t size, gfp_t flags) |
81819f0f | 165 | { |
aadb4bc4 CL |
166 | if (__builtin_constant_p(size)) { |
167 | if (size > PAGE_SIZE / 2) | |
168 | return (void *)__get_free_pages(flags | __GFP_COMP, | |
169 | get_order(size)); | |
81819f0f | 170 | |
aadb4bc4 CL |
171 | if (!(flags & SLUB_DMA)) { |
172 | struct kmem_cache *s = kmalloc_slab(size); | |
173 | ||
174 | if (!s) | |
175 | return ZERO_SIZE_PTR; | |
81819f0f | 176 | |
aadb4bc4 CL |
177 | return kmem_cache_alloc(s, flags); |
178 | } | |
179 | } | |
180 | return __kmalloc(size, flags); | |
81819f0f CL |
181 | } |
182 | ||
81819f0f | 183 | #ifdef CONFIG_NUMA |
6193a2ff PM |
184 | void *__kmalloc_node(size_t size, gfp_t flags, int node); |
185 | void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); | |
81819f0f | 186 | |
aa137f9d | 187 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
81819f0f | 188 | { |
aadb4bc4 CL |
189 | if (__builtin_constant_p(size) && |
190 | size <= PAGE_SIZE / 2 && !(flags & SLUB_DMA)) { | |
191 | struct kmem_cache *s = kmalloc_slab(size); | |
81819f0f CL |
192 | |
193 | if (!s) | |
272c1d21 | 194 | return ZERO_SIZE_PTR; |
81819f0f CL |
195 | |
196 | return kmem_cache_alloc_node(s, flags, node); | |
aadb4bc4 CL |
197 | } |
198 | return __kmalloc_node(size, flags, node); | |
81819f0f CL |
199 | } |
200 | #endif | |
201 | ||
202 | #endif /* _LINUX_SLUB_DEF_H */ |