4 * Internal slab definitions
8 * State of the slab allocator.
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.
16 DOWN, /* No slab functionality yet */
17 PARTIAL, /* SLUB: kmem_cache_node available */
18 PARTIAL_ARRAYCACHE, /* SLAB: kmalloc size for arraycache available */
19 PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */
20 UP, /* Slab caches usable but not all extras yet */
21 FULL /* Everything is working */
24 extern enum slab_state slab_state;
26 /* The slab cache mutex protects the management structures during changes */
27 extern struct mutex slab_mutex;
29 /* The list of all slab caches on the system */
30 extern struct list_head slab_caches;
32 /* The slab cache that manages slab cache information */
33 extern struct kmem_cache *kmem_cache;
35 unsigned long calculate_alignment(unsigned long flags,
36 unsigned long align, unsigned long size);
39 /* Kmalloc array related functions */
40 void create_kmalloc_caches(unsigned long);
42 /* Find the kmalloc slab corresponding for a certain size */
43 struct kmem_cache *kmalloc_slab(size_t, gfp_t);
47 /* Functions provided by the slab allocators */
48 extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
50 extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
52 extern void create_boot_cache(struct kmem_cache *, const char *name,
53 size_t size, unsigned long flags);
58 __kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
59 size_t align, unsigned long flags, void (*ctor)(void *));
61 static 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 *))
68 /* 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 )
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)
78 #define SLAB_DEBUG_FLAGS (0)
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)
88 #define SLAB_CACHE_FLAGS (0)
91 #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
93 int __kmem_cache_shutdown(struct kmem_cache *);
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;
105 unsigned int batchcount;
107 unsigned int objects_per_slab;
108 unsigned int cache_order;
111 void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
112 void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
113 ssize_t slabinfo_write(struct file *file, const char __user *buffer,
114 size_t count, loff_t *ppos);
116 #ifdef CONFIG_MEMCG_KMEM
117 static inline bool is_root_cache(struct kmem_cache *s)
119 return !s->memcg_params || s->memcg_params->is_root_cache;
122 static inline bool cache_match_memcg(struct kmem_cache *cachep,
123 struct mem_cgroup *memcg)
125 return (is_root_cache(cachep) && !memcg) ||
126 (cachep->memcg_params->memcg == memcg);
129 static inline void memcg_bind_pages(struct kmem_cache *s, int order)
131 if (!is_root_cache(s))
132 atomic_add(1 << order, &s->memcg_params->nr_pages);
135 static inline void memcg_release_pages(struct kmem_cache *s, int order)
137 if (is_root_cache(s))
140 if (atomic_sub_and_test((1 << order), &s->memcg_params->nr_pages))
141 mem_cgroup_destroy_cache(s);
144 static inline bool slab_equal_or_root(struct kmem_cache *s,
145 struct kmem_cache *p)
148 (s->memcg_params && (p == s->memcg_params->root_cache));
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
156 static inline const char *cache_name(struct kmem_cache *s)
158 if (!is_root_cache(s))
159 return s->memcg_params->root_cache->name;
163 static inline struct kmem_cache *cache_from_memcg(struct kmem_cache *s, int idx)
165 if (!s->memcg_params)
167 return s->memcg_params->memcg_caches[idx];
170 static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
172 if (is_root_cache(s))
174 return s->memcg_params->root_cache;
177 static inline bool is_root_cache(struct kmem_cache *s)
182 static inline bool cache_match_memcg(struct kmem_cache *cachep,
183 struct mem_cgroup *memcg)
188 static inline void memcg_bind_pages(struct kmem_cache *s, int order)
192 static inline void memcg_release_pages(struct kmem_cache *s, int order)
196 static inline bool slab_equal_or_root(struct kmem_cache *s,
197 struct kmem_cache *p)
202 static inline const char *cache_name(struct kmem_cache *s)
207 static inline struct kmem_cache *cache_from_memcg(struct kmem_cache *s, int idx)
212 static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
218 static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
220 struct kmem_cache *cachep;
224 * When kmemcg is not being used, both assignments should return the
225 * same value. but we don't want to pay the assignment price in that
226 * case. If it is not compiled in, the compiler should be smart enough
227 * to not do even the assignment. In that case, slab_equal_or_root
228 * will also be a constant.
230 if (!memcg_kmem_enabled() && !unlikely(s->flags & SLAB_DEBUG_FREE))
233 page = virt_to_head_page(x);
234 cachep = page->slab_cache;
235 if (slab_equal_or_root(cachep, s))
238 pr_err("%s: Wrong slab cache. %s but object is from %s\n",
239 __FUNCTION__, cachep->name, s->name);
247 * The slab lists for all objects.
249 struct kmem_cache_node {
250 spinlock_t list_lock;
253 struct list_head slabs_partial; /* partial list first, better asm code */
254 struct list_head slabs_full;
255 struct list_head slabs_free;
256 unsigned long free_objects;
257 unsigned int free_limit;
258 unsigned int colour_next; /* Per-node cache coloring */
259 struct array_cache *shared; /* shared per node */
260 struct array_cache **alien; /* on other nodes */
261 unsigned long next_reap; /* updated without locking */
262 int free_touched; /* updated without locking */
266 unsigned long nr_partial;
267 struct list_head partial;
268 #ifdef CONFIG_SLUB_DEBUG
269 atomic_long_t nr_slabs;
270 atomic_long_t total_objects;
271 struct list_head full;
277 void *slab_next(struct seq_file *m, void *p, loff_t *pos);
278 void slab_stop(struct seq_file *m, void *p);