Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[deliverable/linux.git] / include / linux / slub_def.h
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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 *
cde53535 7 * (C) 2007 SGI, Christoph Lameter
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8 */
9#include <linux/types.h>
10#include <linux/gfp.h>
11#include <linux/workqueue.h>
12#include <linux/kobject.h>
02af61bb 13#include <linux/kmemtrace.h>
e4f7c0b4 14#include <linux/kmemleak.h>
81819f0f 15
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16enum stat_item {
17 ALLOC_FASTPATH, /* Allocation from cpu slab */
18 ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
19 FREE_FASTPATH, /* Free to cpu slub */
20 FREE_SLOWPATH, /* Freeing not to cpu slab */
21 FREE_FROZEN, /* Freeing to frozen slab */
22 FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
23 FREE_REMOVE_PARTIAL, /* Freeing removes last object */
24 ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */
25 ALLOC_SLAB, /* Cpu slab acquired from page allocator */
26 ALLOC_REFILL, /* Refill cpu slab from slab freelist */
27 FREE_SLAB, /* Slab freed to the page allocator */
28 CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
29 DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
30 DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
31 DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
32 DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
33 DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
65c3376a 34 ORDER_FALLBACK, /* Number of times fallback was necessary */
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35 NR_SLUB_STAT_ITEMS };
36
dfb4f096 37struct kmem_cache_cpu {
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38 void **freelist; /* Pointer to first free per cpu object */
39 struct page *page; /* The slab from which we are allocating */
40 int node; /* The node of the page (or -1 for debug) */
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41#ifdef CONFIG_SLUB_STATS
42 unsigned stat[NR_SLUB_STAT_ITEMS];
43#endif
4c93c355 44};
dfb4f096 45
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46struct kmem_cache_node {
47 spinlock_t list_lock; /* Protect partial list and nr_partial */
48 unsigned long nr_partial;
81819f0f 49 struct list_head partial;
0c710013 50#ifdef CONFIG_SLUB_DEBUG
0f389ec6 51 atomic_long_t nr_slabs;
205ab99d 52 atomic_long_t total_objects;
643b1138 53 struct list_head full;
0c710013 54#endif
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55};
56
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57/*
58 * Word size structure that can be atomically updated or read and that
59 * contains both the order and the number of objects that a slab of the
60 * given order would contain.
61 */
62struct kmem_cache_order_objects {
63 unsigned long x;
64};
65
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66/*
67 * Slab cache management.
68 */
69struct kmem_cache {
9dfc6e68 70 struct kmem_cache_cpu *cpu_slab;
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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;
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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 *);
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90 int inuse; /* Offset to metadata */
91 int align; /* Alignment */
3b89d7d8 92 unsigned long min_partial;
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93 const char *name; /* Name (only for display!) */
94 struct list_head list; /* List of slab caches */
0c710013 95#ifdef CONFIG_SLUB_DEBUG
81819f0f 96 struct kobject kobj; /* For sysfs */
0c710013 97#endif
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98
99#ifdef CONFIG_NUMA
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100 /*
101 * Defragmentation by allocating from a remote node.
102 */
103 int remote_node_defrag_ratio;
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104 struct kmem_cache_node *node[MAX_NUMNODES];
105#endif
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106};
107
108/*
109 * Kmalloc subsystem.
110 */
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111#if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8
112#define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN
113#else
114#define KMALLOC_MIN_SIZE 8
115#endif
116
117#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE)
81819f0f 118
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119#ifndef ARCH_KMALLOC_MINALIGN
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
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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
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140#ifdef CONFIG_ZONE_DMA
141#define SLUB_DMA __GFP_DMA
142/* Reserve extra caches for potential DMA use */
143#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT - 6)
144#else
145/* Disable DMA functionality */
146#define SLUB_DMA (__force gfp_t)0
147#define KMALLOC_CACHES SLUB_PAGE_SHIFT
148#endif
149
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150/*
151 * We keep the general caches in an array of slab caches that are used for
152 * 2^x bytes of allocations.
153 */
756dee75 154extern struct kmem_cache kmalloc_caches[KMALLOC_CACHES];
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155
156/*
157 * Sorry that the following has to be that ugly but some versions of GCC
158 * have trouble with constant propagation and loops.
159 */
aa137f9d 160static __always_inline int kmalloc_index(size_t size)
81819f0f 161{
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162 if (!size)
163 return 0;
614410d5 164
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165 if (size <= KMALLOC_MIN_SIZE)
166 return KMALLOC_SHIFT_LOW;
167
acdfcd04 168 if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96)
81819f0f 169 return 1;
acdfcd04 170 if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192)
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171 return 2;
172 if (size <= 8) return 3;
173 if (size <= 16) return 4;
174 if (size <= 32) return 5;
175 if (size <= 64) return 6;
176 if (size <= 128) return 7;
177 if (size <= 256) return 8;
178 if (size <= 512) return 9;
179 if (size <= 1024) return 10;
180 if (size <= 2 * 1024) return 11;
6446faa2 181 if (size <= 4 * 1024) return 12;
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182/*
183 * The following is only needed to support architectures with a larger page
184 * size than 4k.
185 */
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186 if (size <= 8 * 1024) return 13;
187 if (size <= 16 * 1024) return 14;
188 if (size <= 32 * 1024) return 15;
189 if (size <= 64 * 1024) return 16;
190 if (size <= 128 * 1024) return 17;
191 if (size <= 256 * 1024) return 18;
aadb4bc4 192 if (size <= 512 * 1024) return 19;
81819f0f 193 if (size <= 1024 * 1024) return 20;
81819f0f 194 if (size <= 2 * 1024 * 1024) return 21;
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195 return -1;
196
197/*
198 * What we really wanted to do and cannot do because of compiler issues is:
199 * int i;
200 * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
201 * if (size <= (1 << i))
202 * return i;
203 */
204}
205
206/*
207 * Find the slab cache for a given combination of allocation flags and size.
208 *
209 * This ought to end up with a global pointer to the right cache
210 * in kmalloc_caches.
211 */
aa137f9d 212static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
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213{
214 int index = kmalloc_index(size);
215
216 if (index == 0)
217 return NULL;
218
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219 return &kmalloc_caches[index];
220}
221
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222void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
223void *__kmalloc(size_t size, gfp_t flags);
224
0f24f128 225#ifdef CONFIG_TRACING
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226extern void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags);
227#else
228static __always_inline void *
229kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags)
230{
231 return kmem_cache_alloc(s, gfpflags);
232}
233#endif
234
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235static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
236{
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237 unsigned int order = get_order(size);
238 void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order);
239
e4f7c0b4 240 kmemleak_alloc(ret, size, 1, flags);
ca2b84cb 241 trace_kmalloc(_THIS_IP_, ret, size, PAGE_SIZE << order, flags);
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242
243 return ret;
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244}
245
aa137f9d 246static __always_inline void *kmalloc(size_t size, gfp_t flags)
81819f0f 247{
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248 void *ret;
249
aadb4bc4 250 if (__builtin_constant_p(size)) {
ffadd4d0 251 if (size > SLUB_MAX_SIZE)
eada35ef 252 return kmalloc_large(size, flags);
81819f0f 253
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254 if (!(flags & SLUB_DMA)) {
255 struct kmem_cache *s = kmalloc_slab(size);
256
257 if (!s)
258 return ZERO_SIZE_PTR;
81819f0f 259
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260 ret = kmem_cache_alloc_notrace(s, flags);
261
ca2b84cb 262 trace_kmalloc(_THIS_IP_, ret, size, s->size, flags);
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263
264 return ret;
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265 }
266 }
267 return __kmalloc(size, flags);
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268}
269
81819f0f 270#ifdef CONFIG_NUMA
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271void *__kmalloc_node(size_t size, gfp_t flags, int node);
272void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
81819f0f 273
0f24f128 274#ifdef CONFIG_TRACING
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275extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *s,
276 gfp_t gfpflags,
277 int node);
278#else
279static __always_inline void *
280kmem_cache_alloc_node_notrace(struct kmem_cache *s,
281 gfp_t gfpflags,
282 int node)
283{
284 return kmem_cache_alloc_node(s, gfpflags, node);
285}
286#endif
287
aa137f9d 288static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
81819f0f 289{
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290 void *ret;
291
aadb4bc4 292 if (__builtin_constant_p(size) &&
ffadd4d0 293 size <= SLUB_MAX_SIZE && !(flags & SLUB_DMA)) {
aadb4bc4 294 struct kmem_cache *s = kmalloc_slab(size);
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295
296 if (!s)
272c1d21 297 return ZERO_SIZE_PTR;
81819f0f 298
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299 ret = kmem_cache_alloc_node_notrace(s, flags, node);
300
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301 trace_kmalloc_node(_THIS_IP_, ret,
302 size, s->size, flags, node);
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303
304 return ret;
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305 }
306 return __kmalloc_node(size, flags, node);
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307}
308#endif
309
310#endif /* _LINUX_SLUB_DEF_H */
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