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 unsigned long calculate_alignment(unsigned long flags,
  36                 unsigned long align, unsigned long size);
  37
  38 /* Functions provided by the slab allocators */
  39 extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
  40
  41 extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
  42                         unsigned long flags);
  43 extern void create_boot_cache(struct kmem_cache *, const char *name,
  44                         size_t size, unsigned long flags);
  45
  46 struct mem_cgroup;
  47 #ifdef CONFIG_SLUB
  48 struct kmem_cache *
  49 __kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
  50                    size_t align, unsigned long flags, void (*ctor)(void *));
  51 #else
  52 static inline struct kmem_cache *
  53 __kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
  54                    size_t align, unsigned long flags, void (*ctor)(void *))
  55 { return NULL; }
  56 #endif
  57
  58
  59 /* Legal flag mask for kmem_cache_create(), for various configurations */
  60 #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \
  61                          SLAB_DESTROY_BY_RCU | SLAB_DEBUG_OBJECTS )
  62
  63 #if defined(CONFIG_DEBUG_SLAB)
  64 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
  65 #elif defined(CONFIG_SLUB_DEBUG)
  66 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
  67                           SLAB_TRACE | SLAB_DEBUG_FREE)
  68 #else
  69 #define SLAB_DEBUG_FLAGS (0)
  70 #endif
  71
  72 #if defined(CONFIG_SLAB)
  73 #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
  74                           SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK)
  75 #elif defined(CONFIG_SLUB)
  76 #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
  77                           SLAB_TEMPORARY | SLAB_NOTRACK)
  78 #else
  79 #define SLAB_CACHE_FLAGS (0)
  80 #endif
  81
  82 #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
  83
  84 int __kmem_cache_shutdown(struct kmem_cache *);
  85
  86 struct seq_file;
  87 struct file;
  88
  89 struct slabinfo {
  90         unsigned long active_objs;
  91         unsigned long num_objs;
  92         unsigned long active_slabs;
  93         unsigned long num_slabs;
  94         unsigned long shared_avail;
  95         unsigned int limit;
  96         unsigned int batchcount;
  97         unsigned int shared;
  98         unsigned int objects_per_slab;
  99         unsigned int cache_order;
 100 };
 101
 102 void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
 103 void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
 104 ssize_t slabinfo_write(struct file *file, const char __user *buffer,
 105                        size_t count, loff_t *ppos);
 106
 107 #ifdef CONFIG_MEMCG_KMEM
 108 static inline bool is_root_cache(struct kmem_cache *s)
 109 {
 110         return !s->memcg_params || s->memcg_params->is_root_cache;
 111 }
 112
 113 static inline bool cache_match_memcg(struct kmem_cache *cachep,
 114                                      struct mem_cgroup *memcg)
 115 {
 116         return (is_root_cache(cachep) && !memcg) ||
 117                                 (cachep->memcg_params->memcg == memcg);
 118 }
 119 #else
 120 static inline bool is_root_cache(struct kmem_cache *s)
 121 {
 122         return true;
 123 }
 124
 125 static inline bool cache_match_memcg(struct kmem_cache *cachep,
 126                                      struct mem_cgroup *memcg)
 127 {
 128         return true;
 129 }
 130 #endif
 131 #endif