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Christoph Lameter97d06602012-07-06 15:25:11 -05001#ifndef MM_SLAB_H
2#define MM_SLAB_H
3/*
4 * Internal slab definitions
5 */
6
7/*
8 * State of the slab allocator.
9 *
10 * This is used to describe the states of the allocator during bootup.
11 * Allocators use this to gradually bootstrap themselves. Most allocators
12 * have the problem that the structures used for managing slab caches are
13 * allocated from slab caches themselves.
14 */
15enum slab_state {
16 DOWN, /* No slab functionality yet */
17 PARTIAL, /* SLUB: kmem_cache_node available */
18 PARTIAL_ARRAYCACHE, /* SLAB: kmalloc size for arraycache available */
Christoph Lameterce8eb6c2013-01-10 19:14:19 +000019 PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */
Christoph Lameter97d06602012-07-06 15:25:11 -050020 UP, /* Slab caches usable but not all extras yet */
21 FULL /* Everything is working */
22};
23
24extern enum slab_state slab_state;
25
Christoph Lameter18004c52012-07-06 15:25:12 -050026/* The slab cache mutex protects the management structures during changes */
27extern struct mutex slab_mutex;
Christoph Lameter9b030cb2012-09-05 00:20:33 +000028
29/* The list of all slab caches on the system */
Christoph Lameter18004c52012-07-06 15:25:12 -050030extern struct list_head slab_caches;
31
Christoph Lameter9b030cb2012-09-05 00:20:33 +000032/* The slab cache that manages slab cache information */
33extern struct kmem_cache *kmem_cache;
34
Christoph Lameter45906852012-11-28 16:23:16 +000035unsigned long calculate_alignment(unsigned long flags,
36 unsigned long align, unsigned long size);
37
Christoph Lameterf97d5f62013-01-10 19:12:17 +000038#ifndef CONFIG_SLOB
39/* Kmalloc array related functions */
40void create_kmalloc_caches(unsigned long);
Christoph Lameter2c59dd62013-01-10 19:14:19 +000041
42/* Find the kmalloc slab corresponding for a certain size */
43struct kmem_cache *kmalloc_slab(size_t, gfp_t);
Christoph Lameterf97d5f62013-01-10 19:12:17 +000044#endif
45
46
Christoph Lameter9b030cb2012-09-05 00:20:33 +000047/* Functions provided by the slab allocators */
Christoph Lameter8a13a4c2012-09-04 23:18:33 +000048extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
Christoph Lameter97d06602012-07-06 15:25:11 -050049
Christoph Lameter45530c42012-11-28 16:23:07 +000050extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
51 unsigned long flags);
52extern void create_boot_cache(struct kmem_cache *, const char *name,
53 size_t size, unsigned long flags);
54
Glauber Costa2633d7a2012-12-18 14:22:34 -080055struct mem_cgroup;
Christoph Lametercbb79692012-09-05 00:18:32 +000056#ifdef CONFIG_SLUB
Glauber Costa2633d7a2012-12-18 14:22:34 -080057struct kmem_cache *
58__kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
59 size_t align, unsigned long flags, void (*ctor)(void *));
Christoph Lametercbb79692012-09-05 00:18:32 +000060#else
Glauber Costa2633d7a2012-12-18 14:22:34 -080061static inline struct kmem_cache *
62__kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
63 size_t align, unsigned long flags, void (*ctor)(void *))
Christoph Lametercbb79692012-09-05 00:18:32 +000064{ return NULL; }
65#endif
66
67
Glauber Costad8843922012-10-17 15:36:51 +040068/* Legal flag mask for kmem_cache_create(), for various configurations */
69#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \
70 SLAB_DESTROY_BY_RCU | SLAB_DEBUG_OBJECTS )
71
72#if defined(CONFIG_DEBUG_SLAB)
73#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
74#elif defined(CONFIG_SLUB_DEBUG)
75#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
76 SLAB_TRACE | SLAB_DEBUG_FREE)
77#else
78#define SLAB_DEBUG_FLAGS (0)
79#endif
80
81#if defined(CONFIG_SLAB)
82#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
83 SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK)
84#elif defined(CONFIG_SLUB)
85#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
86 SLAB_TEMPORARY | SLAB_NOTRACK)
87#else
88#define SLAB_CACHE_FLAGS (0)
89#endif
90
91#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
92
Christoph Lameter945cf2b2012-09-04 23:18:33 +000093int __kmem_cache_shutdown(struct kmem_cache *);
Christoph Lameter945cf2b2012-09-04 23:18:33 +000094
Glauber Costab7454ad2012-10-19 18:20:25 +040095struct seq_file;
96struct file;
Glauber Costab7454ad2012-10-19 18:20:25 +040097
Glauber Costa0d7561c2012-10-19 18:20:27 +040098struct slabinfo {
99 unsigned long active_objs;
100 unsigned long num_objs;
101 unsigned long active_slabs;
102 unsigned long num_slabs;
103 unsigned long shared_avail;
104 unsigned int limit;
105 unsigned int batchcount;
106 unsigned int shared;
107 unsigned int objects_per_slab;
108 unsigned int cache_order;
109};
110
111void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
112void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
Glauber Costab7454ad2012-10-19 18:20:25 +0400113ssize_t slabinfo_write(struct file *file, const char __user *buffer,
114 size_t count, loff_t *ppos);
Glauber Costaba6c4962012-12-18 14:22:27 -0800115
116#ifdef CONFIG_MEMCG_KMEM
117static inline bool is_root_cache(struct kmem_cache *s)
118{
119 return !s->memcg_params || s->memcg_params->is_root_cache;
120}
Glauber Costa2633d7a2012-12-18 14:22:34 -0800121
122static inline bool cache_match_memcg(struct kmem_cache *cachep,
123 struct mem_cgroup *memcg)
124{
125 return (is_root_cache(cachep) && !memcg) ||
126 (cachep->memcg_params->memcg == memcg);
127}
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800128
Glauber Costa1f458cb2012-12-18 14:22:50 -0800129static inline void memcg_bind_pages(struct kmem_cache *s, int order)
130{
131 if (!is_root_cache(s))
132 atomic_add(1 << order, &s->memcg_params->nr_pages);
133}
134
135static inline void memcg_release_pages(struct kmem_cache *s, int order)
136{
137 if (is_root_cache(s))
138 return;
139
140 if (atomic_sub_and_test((1 << order), &s->memcg_params->nr_pages))
141 mem_cgroup_destroy_cache(s);
142}
143
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800144static inline bool slab_equal_or_root(struct kmem_cache *s,
145 struct kmem_cache *p)
146{
147 return (p == s) ||
148 (s->memcg_params && (p == s->memcg_params->root_cache));
149}
Glauber Costa749c5412012-12-18 14:23:01 -0800150
151/*
152 * We use suffixes to the name in memcg because we can't have caches
153 * created in the system with the same name. But when we print them
154 * locally, better refer to them with the base name
155 */
156static inline const char *cache_name(struct kmem_cache *s)
157{
158 if (!is_root_cache(s))
159 return s->memcg_params->root_cache->name;
160 return s->name;
161}
162
163static inline struct kmem_cache *cache_from_memcg(struct kmem_cache *s, int idx)
164{
165 return s->memcg_params->memcg_caches[idx];
166}
Glauber Costa943a4512012-12-18 14:23:03 -0800167
168static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
169{
170 if (is_root_cache(s))
171 return s;
172 return s->memcg_params->root_cache;
173}
Glauber Costaba6c4962012-12-18 14:22:27 -0800174#else
175static inline bool is_root_cache(struct kmem_cache *s)
176{
177 return true;
178}
179
Glauber Costa2633d7a2012-12-18 14:22:34 -0800180static inline bool cache_match_memcg(struct kmem_cache *cachep,
181 struct mem_cgroup *memcg)
182{
183 return true;
184}
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800185
Glauber Costa1f458cb2012-12-18 14:22:50 -0800186static inline void memcg_bind_pages(struct kmem_cache *s, int order)
187{
188}
189
190static inline void memcg_release_pages(struct kmem_cache *s, int order)
191{
192}
193
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800194static inline bool slab_equal_or_root(struct kmem_cache *s,
195 struct kmem_cache *p)
196{
197 return true;
198}
Glauber Costa749c5412012-12-18 14:23:01 -0800199
200static inline const char *cache_name(struct kmem_cache *s)
201{
202 return s->name;
203}
204
205static inline struct kmem_cache *cache_from_memcg(struct kmem_cache *s, int idx)
206{
207 return NULL;
208}
Glauber Costa943a4512012-12-18 14:23:03 -0800209
210static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
211{
212 return s;
213}
Glauber Costaba6c4962012-12-18 14:22:27 -0800214#endif
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800215
216static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
217{
218 struct kmem_cache *cachep;
219 struct page *page;
220
221 /*
222 * When kmemcg is not being used, both assignments should return the
223 * same value. but we don't want to pay the assignment price in that
224 * case. If it is not compiled in, the compiler should be smart enough
225 * to not do even the assignment. In that case, slab_equal_or_root
226 * will also be a constant.
227 */
228 if (!memcg_kmem_enabled() && !unlikely(s->flags & SLAB_DEBUG_FREE))
229 return s;
230
231 page = virt_to_head_page(x);
232 cachep = page->slab_cache;
233 if (slab_equal_or_root(cachep, s))
234 return cachep;
235
236 pr_err("%s: Wrong slab cache. %s but object is from %s\n",
237 __FUNCTION__, cachep->name, s->name);
238 WARN_ON_ONCE(1);
239 return s;
240}
Christoph Lameter97d06602012-07-06 15:25:11 -0500241#endif
Christoph Lameterca349562013-01-10 19:14:19 +0000242
243
244/*
245 * The slab lists for all objects.
246 */
247struct kmem_cache_node {
248 spinlock_t list_lock;
249
250#ifdef CONFIG_SLAB
251 struct list_head slabs_partial; /* partial list first, better asm code */
252 struct list_head slabs_full;
253 struct list_head slabs_free;
254 unsigned long free_objects;
255 unsigned int free_limit;
256 unsigned int colour_next; /* Per-node cache coloring */
257 struct array_cache *shared; /* shared per node */
258 struct array_cache **alien; /* on other nodes */
259 unsigned long next_reap; /* updated without locking */
260 int free_touched; /* updated without locking */
261#endif
262
263#ifdef CONFIG_SLUB
264 unsigned long nr_partial;
265 struct list_head partial;
266#ifdef CONFIG_SLUB_DEBUG
267 atomic_long_t nr_slabs;
268 atomic_long_t total_objects;
269 struct list_head full;
270#endif
271#endif
272
273};