diff options
Diffstat (limited to 'mm/slab.h')
| -rw-r--r-- | mm/slab.h | 190 |
1 files changed, 186 insertions, 4 deletions
diff --git a/mm/slab.h b/mm/slab.h index 7deeb449a301..34a98d642196 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -32,19 +32,201 @@ extern struct list_head slab_caches; /* The slab cache that manages slab cache information */ extern struct kmem_cache *kmem_cache; +unsigned long calculate_alignment(unsigned long flags, + unsigned long align, unsigned long size); + /* Functions provided by the slab allocators */ extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags); +extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size, + unsigned long flags); +extern void create_boot_cache(struct kmem_cache *, const char *name, + size_t size, unsigned long flags); + +struct mem_cgroup; #ifdef CONFIG_SLUB -struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, - size_t align, unsigned long flags, void (*ctor)(void *)); +struct kmem_cache * +__kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size, + size_t align, unsigned long flags, void (*ctor)(void *)); #else -static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, - size_t align, unsigned long flags, void (*ctor)(void *)) +static inline struct kmem_cache * +__kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size, + size_t align, unsigned long flags, void (*ctor)(void *)) { return NULL; } #endif +/* Legal flag mask for kmem_cache_create(), for various configurations */ +#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \ + SLAB_DESTROY_BY_RCU | SLAB_DEBUG_OBJECTS ) + +#if defined(CONFIG_DEBUG_SLAB) +#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) +#elif defined(CONFIG_SLUB_DEBUG) +#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ + SLAB_TRACE | SLAB_DEBUG_FREE) +#else +#define SLAB_DEBUG_FLAGS (0) +#endif + +#if defined(CONFIG_SLAB) +#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \ + SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK) +#elif defined(CONFIG_SLUB) +#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ + SLAB_TEMPORARY | SLAB_NOTRACK) +#else +#define SLAB_CACHE_FLAGS (0) +#endif + +#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS) + int __kmem_cache_shutdown(struct kmem_cache *); +struct seq_file; +struct file; + +struct slabinfo { + unsigned long active_objs; + unsigned long num_objs; + unsigned long active_slabs; + unsigned long num_slabs; + unsigned long shared_avail; + unsigned int limit; + unsigned int batchcount; + unsigned int shared; + unsigned int objects_per_slab; + unsigned int cache_order; +}; + +void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); +void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); +ssize_t slabinfo_write(struct file *file, const char __user *buffer, + size_t count, loff_t *ppos); + +#ifdef CONFIG_MEMCG_KMEM +static inline bool is_root_cache(struct kmem_cache *s) +{ + return !s->memcg_params || s->memcg_params->is_root_cache; +} + +static inline bool cache_match_memcg(struct kmem_cache *cachep, + struct mem_cgroup *memcg) +{ + return (is_root_cache(cachep) && !memcg) || + (cachep->memcg_params->memcg == memcg); +} + +static inline void memcg_bind_pages(struct kmem_cache *s, int order) +{ + if (!is_root_cache(s)) + atomic_add(1 << order, &s->memcg_params->nr_pages); +} + +static inline void memcg_release_pages(struct kmem_cache *s, int order) +{ + if (is_root_cache(s)) + return; + + if (atomic_sub_and_test((1 << order), &s->memcg_params->nr_pages)) + mem_cgroup_destroy_cache(s); +} + +static inline bool slab_equal_or_root(struct kmem_cache *s, + struct kmem_cache *p) +{ + return (p == s) || + (s->memcg_params && (p == s->memcg_params->root_cache)); +} + +/* + * We use suffixes to the name in memcg because we can't have caches + * created in the system with the same name. But when we print them + * locally, better refer to them with the base name + */ +static inline const char *cache_name(struct kmem_cache *s) +{ + if (!is_root_cache(s)) + return s->memcg_params->root_cache->name; + return s->name; +} + +static inline struct kmem_cache *cache_from_memcg(struct kmem_cache *s, int idx) +{ + return s->memcg_params->memcg_caches[idx]; +} + +static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) +{ + if (is_root_cache(s)) + return s; + return s->memcg_params->root_cache; +} +#else +static inline bool is_root_cache(struct kmem_cache *s) +{ + return true; +} + +static inline bool cache_match_memcg(struct kmem_cache *cachep, + struct mem_cgroup *memcg) +{ + return true; +} + +static inline void memcg_bind_pages(struct kmem_cache *s, int order) +{ +} + +static inline void memcg_release_pages(struct kmem_cache *s, int order) +{ +} + +static inline bool slab_equal_or_root(struct kmem_cache *s, + struct kmem_cache *p) +{ + return true; +} + +static inline const char *cache_name(struct kmem_cache *s) +{ + return s->name; +} + +static inline struct kmem_cache *cache_from_memcg(struct kmem_cache *s, int idx) +{ + return NULL; +} + +static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) +{ + return s; +} +#endif + +static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) +{ + struct kmem_cache *cachep; + struct page *page; + + /* + * When kmemcg is not being used, both assignments should return the + * same value. but we don't want to pay the assignment price in that + * case. If it is not compiled in, the compiler should be smart enough + * to not do even the assignment. In that case, slab_equal_or_root + * will also be a constant. + */ + if (!memcg_kmem_enabled() && !unlikely(s->flags & SLAB_DEBUG_FREE)) + return s; + + page = virt_to_head_page(x); + cachep = page->slab_cache; + if (slab_equal_or_root(cachep, s)) + return cachep; + + pr_err("%s: Wrong slab cache. %s but object is from %s\n", + __FUNCTION__, cachep->name, s->name); + WARN_ON_ONCE(1); + return s; +} #endif |