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