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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>
e4f7c0b4 13#include <linux/kmemleak.h>
81819f0f 14
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15#include <trace/events/kmem.h>
16
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17enum stat_item {
18 ALLOC_FASTPATH, /* Allocation from cpu slab */
19 ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
20 FREE_FASTPATH, /* Free to cpu slub */
21 FREE_SLOWPATH, /* Freeing not to cpu slab */
22 FREE_FROZEN, /* Freeing to frozen slab */
23 FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
24 FREE_REMOVE_PARTIAL, /* Freeing removes last object */
25 ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */
26 ALLOC_SLAB, /* Cpu slab acquired from page allocator */
27 ALLOC_REFILL, /* Refill cpu slab from slab freelist */
28 FREE_SLAB, /* Slab freed to the page allocator */
29 CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
30 DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
31 DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
32 DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
33 DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
34 DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
65c3376a 35 ORDER_FALLBACK, /* Number of times fallback was necessary */
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36 NR_SLUB_STAT_ITEMS };
37
dfb4f096 38struct kmem_cache_cpu {
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39 void **freelist; /* Pointer to first free per cpu object */
40 struct page *page; /* The slab from which we are allocating */
41 int node; /* The node of the page (or -1 for debug) */
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42#ifdef CONFIG_SLUB_STATS
43 unsigned stat[NR_SLUB_STAT_ITEMS];
44#endif
4c93c355 45};
dfb4f096 46
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47struct kmem_cache_node {
48 spinlock_t list_lock; /* Protect partial list and nr_partial */
49 unsigned long nr_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
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56};
57
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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 */
63struct kmem_cache_order_objects {
64 unsigned long x;
65};
66
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67/*
68 * Slab cache management.
69 */
70struct kmem_cache {
9dfc6e68 71 struct kmem_cache_cpu *cpu_slab;
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72 /* Used for retriving partial slabs etc */
73 unsigned long flags;
74 int size; /* The size of an object including meta data */
75 int objsize; /* The size of an object without meta data */
76 int offset; /* Free pointer offset. */
834f3d11 77 struct kmem_cache_order_objects oo;
81819f0f 78
81819f0f 79 /* Allocation and freeing of slabs */
205ab99d 80 struct kmem_cache_order_objects max;
65c3376a 81 struct kmem_cache_order_objects min;
b7a49f0d 82 gfp_t allocflags; /* gfp flags to use on each alloc */
81819f0f 83 int refcount; /* Refcount for slab cache destroy */
51cc5068 84 void (*ctor)(void *);
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85 int inuse; /* Offset to metadata */
86 int align; /* Alignment */
3b89d7d8 87 unsigned long min_partial;
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88 const char *name; /* Name (only for display!) */
89 struct list_head list; /* List of slab caches */
0c710013 90#ifdef CONFIG_SLUB_DEBUG
81819f0f 91 struct kobject kobj; /* For sysfs */
0c710013 92#endif
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93
94#ifdef CONFIG_NUMA
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95 /*
96 * Defragmentation by allocating from a remote node.
97 */
98 int remote_node_defrag_ratio;
81819f0f 99 struct kmem_cache_node *node[MAX_NUMNODES];
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100#else
101 /* Avoid an extra cache line for UP */
102 struct kmem_cache_node local_node;
81819f0f 103#endif
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104};
105
106/*
107 * Kmalloc subsystem.
108 */
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109#if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8
110#define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN
111#else
112#define KMALLOC_MIN_SIZE 8
113#endif
114
115#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE)
81819f0f 116
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117#ifndef ARCH_KMALLOC_MINALIGN
118#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
119#endif
120
121#ifndef ARCH_SLAB_MINALIGN
122#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
123#endif
124
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125/*
126 * Maximum kmalloc object size handled by SLUB. Larger object allocations
127 * are passed through to the page allocator. The page allocator "fastpath"
128 * is relatively slow so we need this value sufficiently high so that
129 * performance critical objects are allocated through the SLUB fastpath.
130 *
131 * This should be dropped to PAGE_SIZE / 2 once the page allocator
132 * "fastpath" becomes competitive with the slab allocator fastpaths.
133 */
51735a7c 134#define SLUB_MAX_SIZE (2 * PAGE_SIZE)
ffadd4d0 135
51735a7c 136#define SLUB_PAGE_SHIFT (PAGE_SHIFT + 2)
ffadd4d0 137
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138#ifdef CONFIG_ZONE_DMA
139#define SLUB_DMA __GFP_DMA
140/* Reserve extra caches for potential DMA use */
0f1f6942 141#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT)
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142#else
143/* Disable DMA functionality */
144#define SLUB_DMA (__force gfp_t)0
145#define KMALLOC_CACHES SLUB_PAGE_SHIFT
146#endif
147
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148/*
149 * We keep the general caches in an array of slab caches that are used for
150 * 2^x bytes of allocations.
151 */
756dee75 152extern struct kmem_cache kmalloc_caches[KMALLOC_CACHES];
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153
154/*
155 * Sorry that the following has to be that ugly but some versions of GCC
156 * have trouble with constant propagation and loops.
157 */
aa137f9d 158static __always_inline int kmalloc_index(size_t size)
81819f0f 159{
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160 if (!size)
161 return 0;
614410d5 162
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163 if (size <= KMALLOC_MIN_SIZE)
164 return KMALLOC_SHIFT_LOW;
165
acdfcd04 166 if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96)
81819f0f 167 return 1;
acdfcd04 168 if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192)
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169 return 2;
170 if (size <= 8) return 3;
171 if (size <= 16) return 4;
172 if (size <= 32) return 5;
173 if (size <= 64) return 6;
174 if (size <= 128) return 7;
175 if (size <= 256) return 8;
176 if (size <= 512) return 9;
177 if (size <= 1024) return 10;
178 if (size <= 2 * 1024) return 11;
6446faa2 179 if (size <= 4 * 1024) return 12;
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180/*
181 * The following is only needed to support architectures with a larger page
182 * size than 4k.
183 */
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184 if (size <= 8 * 1024) return 13;
185 if (size <= 16 * 1024) return 14;
186 if (size <= 32 * 1024) return 15;
187 if (size <= 64 * 1024) return 16;
188 if (size <= 128 * 1024) return 17;
189 if (size <= 256 * 1024) return 18;
aadb4bc4 190 if (size <= 512 * 1024) return 19;
81819f0f 191 if (size <= 1024 * 1024) return 20;
81819f0f 192 if (size <= 2 * 1024 * 1024) return 21;
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193 return -1;
194
195/*
196 * What we really wanted to do and cannot do because of compiler issues is:
197 * int i;
198 * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++)
199 * if (size <= (1 << i))
200 * return i;
201 */
202}
203
204/*
205 * Find the slab cache for a given combination of allocation flags and size.
206 *
207 * This ought to end up with a global pointer to the right cache
208 * in kmalloc_caches.
209 */
aa137f9d 210static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
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211{
212 int index = kmalloc_index(size);
213
214 if (index == 0)
215 return NULL;
216
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217 return &kmalloc_caches[index];
218}
219
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220void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
221void *__kmalloc(size_t size, gfp_t flags);
222
0f24f128 223#ifdef CONFIG_TRACING
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224extern void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags);
225#else
226static __always_inline void *
227kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags)
228{
229 return kmem_cache_alloc(s, gfpflags);
230}
231#endif
232
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233static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
234{
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235 unsigned int order = get_order(size);
236 void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order);
237
e4f7c0b4 238 kmemleak_alloc(ret, size, 1, flags);
ca2b84cb 239 trace_kmalloc(_THIS_IP_, ret, size, PAGE_SIZE << order, flags);
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240
241 return ret;
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242}
243
aa137f9d 244static __always_inline void *kmalloc(size_t size, gfp_t flags)
81819f0f 245{
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246 void *ret;
247
aadb4bc4 248 if (__builtin_constant_p(size)) {
ffadd4d0 249 if (size > SLUB_MAX_SIZE)
eada35ef 250 return kmalloc_large(size, flags);
81819f0f 251
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252 if (!(flags & SLUB_DMA)) {
253 struct kmem_cache *s = kmalloc_slab(size);
254
255 if (!s)
256 return ZERO_SIZE_PTR;
81819f0f 257
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258 ret = kmem_cache_alloc_notrace(s, flags);
259
ca2b84cb 260 trace_kmalloc(_THIS_IP_, ret, size, s->size, flags);
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261
262 return ret;
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263 }
264 }
265 return __kmalloc(size, flags);
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266}
267
81819f0f 268#ifdef CONFIG_NUMA
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269void *__kmalloc_node(size_t size, gfp_t flags, int node);
270void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
81819f0f 271
0f24f128 272#ifdef CONFIG_TRACING
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273extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *s,
274 gfp_t gfpflags,
275 int node);
276#else
277static __always_inline void *
278kmem_cache_alloc_node_notrace(struct kmem_cache *s,
279 gfp_t gfpflags,
280 int node)
281{
282 return kmem_cache_alloc_node(s, gfpflags, node);
283}
284#endif
285
aa137f9d 286static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
81819f0f 287{
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288 void *ret;
289
aadb4bc4 290 if (__builtin_constant_p(size) &&
ffadd4d0 291 size <= SLUB_MAX_SIZE && !(flags & SLUB_DMA)) {
aadb4bc4 292 struct kmem_cache *s = kmalloc_slab(size);
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293
294 if (!s)
272c1d21 295 return ZERO_SIZE_PTR;
81819f0f 296
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297 ret = kmem_cache_alloc_node_notrace(s, flags, node);
298
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299 trace_kmalloc_node(_THIS_IP_, ret,
300 size, s->size, flags, node);
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301
302 return ret;
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303 }
304 return __kmalloc_node(size, flags, node);
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305}
306#endif
307
308#endif /* _LINUX_SLUB_DEF_H */