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 extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
  39                         unsigned long flags);
  40 extern void create_boot_cache(struct kmem_cache *, const char *name,
  41                         size_t size, unsigned long flags);
  42
  43 #ifdef CONFIG_SLUB
  44 struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
  45         size_t align, unsigned long flags, void (*ctor)(void *));
  46 #else
  47 static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size,
  48         size_t align, unsigned long flags, void (*ctor)(void *))
  49 { return NULL; }
  50 #endif
  51
  52
  53 /* Legal flag mask for kmem_cache_create(), for various configurations */
  54 #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \
  55                          SLAB_DESTROY_BY_RCU | SLAB_DEBUG_OBJECTS )
  56
  57 #if defined(CONFIG_DEBUG_SLAB)
  58 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
  59 #elif defined(CONFIG_SLUB_DEBUG)
  60 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
  61                           SLAB_TRACE | SLAB_DEBUG_FREE)
  62 #else
  63 #define SLAB_DEBUG_FLAGS (0)
  64 #endif
  65
  66 #if defined(CONFIG_SLAB)
  67 #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
  68                           SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK)
  69 #elif defined(CONFIG_SLUB)
  70 #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
  71                           SLAB_TEMPORARY | SLAB_NOTRACK)
  72 #else
  73 #define SLAB_CACHE_FLAGS (0)
  74 #endif
  75
  76 #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
  77
  78 int __kmem_cache_shutdown(struct kmem_cache *);
  79
  80 struct seq_file;
  81 struct file;
  82
  83 struct slabinfo {
  84         unsigned long active_objs;
  85         unsigned long num_objs;
  86         unsigned long active_slabs;
  87         unsigned long num_slabs;
  88         unsigned long shared_avail;
  89         unsigned int limit;
  90         unsigned int batchcount;
  91         unsigned int shared;
  92         unsigned int objects_per_slab;
  93         unsigned int cache_order;
  94 };
  95
  96 void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
  97 void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
  98 ssize_t slabinfo_write(struct file *file, const char __user *buffer,
  99                        size_t count, loff_t *ppos);
 100 #endif