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TOMOYO Linux Cross Reference
Linux/mm/slab.h

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  1 #ifndef MM_SLAB_H
  2 #define MM_SLAB_H
  3 /*
  4  * Internal slab definitions
  5  */
  6 
  7 #ifdef CONFIG_SLOB
  8 /*
  9  * Common fields provided in kmem_cache by all slab allocators
 10  * This struct is either used directly by the allocator (SLOB)
 11  * or the allocator must include definitions for all fields
 12  * provided in kmem_cache_common in their definition of kmem_cache.
 13  *
 14  * Once we can do anonymous structs (C11 standard) we could put a
 15  * anonymous struct definition in these allocators so that the
 16  * separate allocations in the kmem_cache structure of SLAB and
 17  * SLUB is no longer needed.
 18  */
 19 struct kmem_cache {
 20         unsigned int object_size;/* The original size of the object */
 21         unsigned int size;      /* The aligned/padded/added on size  */
 22         unsigned int align;     /* Alignment as calculated */
 23         unsigned long flags;    /* Active flags on the slab */
 24         const char *name;       /* Slab name for sysfs */
 25         int refcount;           /* Use counter */
 26         void (*ctor)(void *);   /* Called on object slot creation */
 27         struct list_head list;  /* List of all slab caches on the system */
 28 };
 29 
 30 #endif /* CONFIG_SLOB */
 31 
 32 #ifdef CONFIG_SLAB
 33 #include <linux/slab_def.h>
 34 #endif
 35 
 36 #ifdef CONFIG_SLUB
 37 #include <linux/slub_def.h>
 38 #endif
 39 
 40 #include <linux/memcontrol.h>
 41 
 42 /*
 43  * State of the slab allocator.
 44  *
 45  * This is used to describe the states of the allocator during bootup.
 46  * Allocators use this to gradually bootstrap themselves. Most allocators
 47  * have the problem that the structures used for managing slab caches are
 48  * allocated from slab caches themselves.
 49  */
 50 enum slab_state {
 51         DOWN,                   /* No slab functionality yet */
 52         PARTIAL,                /* SLUB: kmem_cache_node available */
 53         PARTIAL_NODE,           /* SLAB: kmalloc size for node struct available */
 54         UP,                     /* Slab caches usable but not all extras yet */
 55         FULL                    /* Everything is working */
 56 };
 57 
 58 extern enum slab_state slab_state;
 59 
 60 /* The slab cache mutex protects the management structures during changes */
 61 extern struct mutex slab_mutex;
 62 
 63 /* The list of all slab caches on the system */
 64 extern struct list_head slab_caches;
 65 
 66 /* The slab cache that manages slab cache information */
 67 extern struct kmem_cache *kmem_cache;
 68 
 69 unsigned long calculate_alignment(unsigned long flags,
 70                 unsigned long align, unsigned long size);
 71 
 72 #ifndef CONFIG_SLOB
 73 /* Kmalloc array related functions */
 74 void create_kmalloc_caches(unsigned long);
 75 
 76 /* Find the kmalloc slab corresponding for a certain size */
 77 struct kmem_cache *kmalloc_slab(size_t, gfp_t);
 78 #endif
 79 
 80 
 81 /* Functions provided by the slab allocators */
 82 extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
 83 
 84 extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
 85                         unsigned long flags);
 86 extern void create_boot_cache(struct kmem_cache *, const char *name,
 87                         size_t size, unsigned long flags);
 88 
 89 int slab_unmergeable(struct kmem_cache *s);
 90 struct kmem_cache *find_mergeable(size_t size, size_t align,
 91                 unsigned long flags, const char *name, void (*ctor)(void *));
 92 #ifndef CONFIG_SLOB
 93 struct kmem_cache *
 94 __kmem_cache_alias(const char *name, size_t size, size_t align,
 95                    unsigned long flags, void (*ctor)(void *));
 96 
 97 unsigned long kmem_cache_flags(unsigned long object_size,
 98         unsigned long flags, const char *name,
 99         void (*ctor)(void *));
100 #else
101 static inline struct kmem_cache *
102 __kmem_cache_alias(const char *name, size_t size, size_t align,
103                    unsigned long flags, void (*ctor)(void *))
104 { return NULL; }
105 
106 static inline unsigned long kmem_cache_flags(unsigned long object_size,
107         unsigned long flags, const char *name,
108         void (*ctor)(void *))
109 {
110         return flags;
111 }
112 #endif
113 
114 
115 /* Legal flag mask for kmem_cache_create(), for various configurations */
116 #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \
117                          SLAB_DESTROY_BY_RCU | SLAB_DEBUG_OBJECTS )
118 
119 #if defined(CONFIG_DEBUG_SLAB)
120 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
121 #elif defined(CONFIG_SLUB_DEBUG)
122 #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
123                           SLAB_TRACE | SLAB_DEBUG_FREE)
124 #else
125 #define SLAB_DEBUG_FLAGS (0)
126 #endif
127 
128 #if defined(CONFIG_SLAB)
129 #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
130                           SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK)
131 #elif defined(CONFIG_SLUB)
132 #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
133                           SLAB_TEMPORARY | SLAB_NOTRACK)
134 #else
135 #define SLAB_CACHE_FLAGS (0)
136 #endif
137 
138 #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
139 
140 int __kmem_cache_shutdown(struct kmem_cache *);
141 int __kmem_cache_shrink(struct kmem_cache *, bool);
142 void slab_kmem_cache_release(struct kmem_cache *);
143 
144 struct seq_file;
145 struct file;
146 
147 struct slabinfo {
148         unsigned long active_objs;
149         unsigned long num_objs;
150         unsigned long active_slabs;
151         unsigned long num_slabs;
152         unsigned long shared_avail;
153         unsigned int limit;
154         unsigned int batchcount;
155         unsigned int shared;
156         unsigned int objects_per_slab;
157         unsigned int cache_order;
158 };
159 
160 void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
161 void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
162 ssize_t slabinfo_write(struct file *file, const char __user *buffer,
163                        size_t count, loff_t *ppos);
164 
165 #ifdef CONFIG_MEMCG_KMEM
166 /*
167  * Iterate over all memcg caches of the given root cache. The caller must hold
168  * slab_mutex.
169  */
170 #define for_each_memcg_cache(iter, root) \
171         list_for_each_entry(iter, &(root)->memcg_params.list, \
172                             memcg_params.list)
173 
174 #define for_each_memcg_cache_safe(iter, tmp, root) \
175         list_for_each_entry_safe(iter, tmp, &(root)->memcg_params.list, \
176                                  memcg_params.list)
177 
178 static inline bool is_root_cache(struct kmem_cache *s)
179 {
180         return s->memcg_params.is_root_cache;
181 }
182 
183 static inline bool slab_equal_or_root(struct kmem_cache *s,
184                                       struct kmem_cache *p)
185 {
186         return p == s || p == s->memcg_params.root_cache;
187 }
188 
189 /*
190  * We use suffixes to the name in memcg because we can't have caches
191  * created in the system with the same name. But when we print them
192  * locally, better refer to them with the base name
193  */
194 static inline const char *cache_name(struct kmem_cache *s)
195 {
196         if (!is_root_cache(s))
197                 s = s->memcg_params.root_cache;
198         return s->name;
199 }
200 
201 /*
202  * Note, we protect with RCU only the memcg_caches array, not per-memcg caches.
203  * That said the caller must assure the memcg's cache won't go away by either
204  * taking a css reference to the owner cgroup, or holding the slab_mutex.
205  */
206 static inline struct kmem_cache *
207 cache_from_memcg_idx(struct kmem_cache *s, int idx)
208 {
209         struct kmem_cache *cachep;
210         struct memcg_cache_array *arr;
211 
212         rcu_read_lock();
213         arr = rcu_dereference(s->memcg_params.memcg_caches);
214 
215         /*
216          * Make sure we will access the up-to-date value. The code updating
217          * memcg_caches issues a write barrier to match this (see
218          * memcg_create_kmem_cache()).
219          */
220         cachep = lockless_dereference(arr->entries[idx]);
221         rcu_read_unlock();
222 
223         return cachep;
224 }
225 
226 static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
227 {
228         if (is_root_cache(s))
229                 return s;
230         return s->memcg_params.root_cache;
231 }
232 
233 static __always_inline int memcg_charge_slab(struct kmem_cache *s,
234                                              gfp_t gfp, int order)
235 {
236         if (!memcg_kmem_enabled())
237                 return 0;
238         if (is_root_cache(s))
239                 return 0;
240         return memcg_charge_kmem(s->memcg_params.memcg, gfp, 1 << order);
241 }
242 
243 static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
244 {
245         if (!memcg_kmem_enabled())
246                 return;
247         if (is_root_cache(s))
248                 return;
249         memcg_uncharge_kmem(s->memcg_params.memcg, 1 << order);
250 }
251 
252 extern void slab_init_memcg_params(struct kmem_cache *);
253 
254 #else /* !CONFIG_MEMCG_KMEM */
255 
256 #define for_each_memcg_cache(iter, root) \
257         for ((void)(iter), (void)(root); 0; )
258 #define for_each_memcg_cache_safe(iter, tmp, root) \
259         for ((void)(iter), (void)(tmp), (void)(root); 0; )
260 
261 static inline bool is_root_cache(struct kmem_cache *s)
262 {
263         return true;
264 }
265 
266 static inline bool slab_equal_or_root(struct kmem_cache *s,
267                                       struct kmem_cache *p)
268 {
269         return true;
270 }
271 
272 static inline const char *cache_name(struct kmem_cache *s)
273 {
274         return s->name;
275 }
276 
277 static inline struct kmem_cache *
278 cache_from_memcg_idx(struct kmem_cache *s, int idx)
279 {
280         return NULL;
281 }
282 
283 static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
284 {
285         return s;
286 }
287 
288 static inline int memcg_charge_slab(struct kmem_cache *s, gfp_t gfp, int order)
289 {
290         return 0;
291 }
292 
293 static inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
294 {
295 }
296 
297 static inline void slab_init_memcg_params(struct kmem_cache *s)
298 {
299 }
300 #endif /* CONFIG_MEMCG_KMEM */
301 
302 static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
303 {
304         struct kmem_cache *cachep;
305         struct page *page;
306 
307         /*
308          * When kmemcg is not being used, both assignments should return the
309          * same value. but we don't want to pay the assignment price in that
310          * case. If it is not compiled in, the compiler should be smart enough
311          * to not do even the assignment. In that case, slab_equal_or_root
312          * will also be a constant.
313          */
314         if (!memcg_kmem_enabled() && !unlikely(s->flags & SLAB_DEBUG_FREE))
315                 return s;
316 
317         page = virt_to_head_page(x);
318         cachep = page->slab_cache;
319         if (slab_equal_or_root(cachep, s))
320                 return cachep;
321 
322         pr_err("%s: Wrong slab cache. %s but object is from %s\n",
323                __func__, cachep->name, s->name);
324         WARN_ON_ONCE(1);
325         return s;
326 }
327 
328 #ifndef CONFIG_SLOB
329 /*
330  * The slab lists for all objects.
331  */
332 struct kmem_cache_node {
333         spinlock_t list_lock;
334 
335 #ifdef CONFIG_SLAB
336         struct list_head slabs_partial; /* partial list first, better asm code */
337         struct list_head slabs_full;
338         struct list_head slabs_free;
339         unsigned long free_objects;
340         unsigned int free_limit;
341         unsigned int colour_next;       /* Per-node cache coloring */
342         struct array_cache *shared;     /* shared per node */
343         struct alien_cache **alien;     /* on other nodes */
344         unsigned long next_reap;        /* updated without locking */
345         int free_touched;               /* updated without locking */
346 #endif
347 
348 #ifdef CONFIG_SLUB
349         unsigned long nr_partial;
350         struct list_head partial;
351 #ifdef CONFIG_SLUB_DEBUG
352         atomic_long_t nr_slabs;
353         atomic_long_t total_objects;
354         struct list_head full;
355 #endif
356 #endif
357 
358 };
359 
360 static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
361 {
362         return s->node[node];
363 }
364 
365 /*
366  * Iterator over all nodes. The body will be executed for each node that has
367  * a kmem_cache_node structure allocated (which is true for all online nodes)
368  */
369 #define for_each_kmem_cache_node(__s, __node, __n) \
370         for (__node = 0; __node < nr_node_ids; __node++) \
371                  if ((__n = get_node(__s, __node)))
372 
373 #endif
374 
375 void *slab_start(struct seq_file *m, loff_t *pos);
376 void *slab_next(struct seq_file *m, void *p, loff_t *pos);
377 void slab_stop(struct seq_file *m, void *p);
378 int memcg_slab_show(struct seq_file *m, void *p);
379 
380 #endif /* MM_SLAB_H */
381 

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