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_L3, /* SLAB: kmalloc size for l3 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);
38 /* Functions provided by the slab allocators */
39 extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
41 extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
43 extern void create_boot_cache(struct kmem_cache *, const char *name,
44 size_t size, unsigned long flags);
47 struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
48 size_t align, unsigned long flags, void (*ctor)(void *));
50 static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
51 size_t align, unsigned long flags, void (*ctor)(void *))
56 /* Legal flag mask for kmem_cache_create(), for various configurations */
57 #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \
58 SLAB_DESTROY_BY_RCU | SLAB_DEBUG_OBJECTS )
60 #if defined(CONFIG_DEBUG_SLAB)
61 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
62 #elif defined(CONFIG_SLUB_DEBUG)
63 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
64 SLAB_TRACE | SLAB_DEBUG_FREE)
66 #define SLAB_DEBUG_FLAGS (0)
69 #if defined(CONFIG_SLAB)
70 #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
71 SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK)
72 #elif defined(CONFIG_SLUB)
73 #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
74 SLAB_TEMPORARY | SLAB_NOTRACK)
76 #define SLAB_CACHE_FLAGS (0)
79 #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
81 int __kmem_cache_shutdown(struct kmem_cache *);
87 unsigned long active_objs;
88 unsigned long num_objs;
89 unsigned long active_slabs;
90 unsigned long num_slabs;
91 unsigned long shared_avail;
93 unsigned int batchcount;
95 unsigned int objects_per_slab;
96 unsigned int cache_order;
99 void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
100 void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
101 ssize_t slabinfo_write(struct file *file, const char __user *buffer,
102 size_t count, loff_t *ppos);
104 #ifdef CONFIG_MEMCG_KMEM
105 static inline bool is_root_cache(struct kmem_cache *s)
107 return !s->memcg_params || s->memcg_params->is_root_cache;
110 static inline bool is_root_cache(struct kmem_cache *s)