mm/slab.h

   1 #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  */
  15 enum slab_state {
  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 */
  22 };
  23
  24 extern enum slab_state slab_state;
  25
  26 /* The slab cache mutex protects the management structures during changes */
  27 extern struct mutex slab_mutex;
  28
  29 /* The list of all slab caches on the system */
  30 extern struct list_head slab_caches;
  31
  32 /* The slab cache that manages slab cache information */
  33 extern struct kmem_cache *kmem_cache;
  34
  35 /* Functions provided by the slab allocators */
  36 extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
  37
  38 #ifdef CONFIG_SLUB
  39 struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
  40         size_t align, unsigned long flags, void (*ctor)(void *));
  41 #else
  42 static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
  43         size_t align, unsigned long flags, void (*ctor)(void *))
  44 { return NULL; }
  45 #endif
  46
  47
  48 int __kmem_cache_shutdown(struct kmem_cache *);
  49
  50 struct seq_file;
  51 struct file;
  52
  53 struct slabinfo {
  54         unsigned long active_objs;
  55         unsigned long num_objs;
  56         unsigned long active_slabs;
  57         unsigned long num_slabs;
  58         unsigned long shared_avail;
  59         unsigned int limit;
  60         unsigned int batchcount;
  61         unsigned int shared;
  62         unsigned int objects_per_slab;
  63         unsigned int cache_order;
  64 };
  65
  66 void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
  67 void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
  68 ssize_t slabinfo_write(struct file *file, const char __user *buffer,
  69                        size_t count, loff_t *ppos);
  70 #endif