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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_NODE, /* SLAB: kmalloc size for node 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 | #ifndef CONFIG_SLOB |
39 | /* Kmalloc array related functions */ |
40 | void create_kmalloc_caches(unsigned long); |
41 | |
42 | /* Find the kmalloc slab corresponding for a certain size */ |
43 | struct kmem_cache *kmalloc_slab(size_t, gfp_t); |
44 | #endif |
45 | |
46 | |
47 | /* Functions provided by the slab allocators */ |
48 | extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags); |
49 | |
50 | extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size, |
51 | unsigned long flags); |
52 | extern void create_boot_cache(struct kmem_cache *, const char *name, |
53 | size_t size, unsigned long flags); |
54 | |
55 | struct mem_cgroup; |
56 | #ifdef CONFIG_SLUB |
57 | struct kmem_cache * |
58 | __kmem_cache_alias(const char *name, size_t size, size_t align, |
59 | unsigned long flags, void (*ctor)(void *)); |
60 | #else |
61 | static inline struct kmem_cache * |
62 | __kmem_cache_alias(const char *name, size_t size, size_t align, |
63 | unsigned long flags, void (*ctor)(void *)) |
64 | { return NULL; } |
65 | #endif |
66 | |
67 | |
68 | /* Legal flag mask for kmem_cache_create(), for various configurations */ |
69 | #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \ |
70 | SLAB_DESTROY_BY_RCU | SLAB_DEBUG_OBJECTS ) |
71 | |
72 | #if defined(CONFIG_DEBUG_SLAB) |
73 | #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) |
74 | #elif defined(CONFIG_SLUB_DEBUG) |
75 | #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ |
76 | SLAB_TRACE | SLAB_DEBUG_FREE) |
77 | #else |
78 | #define SLAB_DEBUG_FLAGS (0) |
79 | #endif |
80 | |
81 | #if defined(CONFIG_SLAB) |
82 | #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \ |
83 | SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK) |
84 | #elif defined(CONFIG_SLUB) |
85 | #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ |
86 | SLAB_TEMPORARY | SLAB_NOTRACK) |
87 | #else |
88 | #define SLAB_CACHE_FLAGS (0) |
89 | #endif |
90 | |
91 | #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS) |
92 | |
93 | int __kmem_cache_shutdown(struct kmem_cache *); |
94 | int __kmem_cache_shrink(struct kmem_cache *); |
95 | void slab_kmem_cache_release(struct kmem_cache *); |
96 | |
97 | struct seq_file; |
98 | struct file; |
99 | |
100 | struct slabinfo { |
101 | unsigned long active_objs; |
102 | unsigned long num_objs; |
103 | unsigned long active_slabs; |
104 | unsigned long num_slabs; |
105 | unsigned long shared_avail; |
106 | unsigned int limit; |
107 | unsigned int batchcount; |
108 | unsigned int shared; |
109 | unsigned int objects_per_slab; |
110 | unsigned int cache_order; |
111 | }; |
112 | |
113 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); |
114 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); |
115 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
116 | size_t count, loff_t *ppos); |
117 | |
118 | #ifdef CONFIG_MEMCG_KMEM |
119 | static inline bool is_root_cache(struct kmem_cache *s) |
120 | { |
121 | return !s->memcg_params || s->memcg_params->is_root_cache; |
122 | } |
123 | |
124 | static inline bool slab_equal_or_root(struct kmem_cache *s, |
125 | struct kmem_cache *p) |
126 | { |
127 | return (p == s) || |
128 | (s->memcg_params && (p == s->memcg_params->root_cache)); |
129 | } |
130 | |
131 | /* |
132 | * We use suffixes to the name in memcg because we can't have caches |
133 | * created in the system with the same name. But when we print them |
134 | * locally, better refer to them with the base name |
135 | */ |
136 | static inline const char *cache_name(struct kmem_cache *s) |
137 | { |
138 | if (!is_root_cache(s)) |
139 | return s->memcg_params->root_cache->name; |
140 | return s->name; |
141 | } |
142 | |
143 | /* |
144 | * Note, we protect with RCU only the memcg_caches array, not per-memcg caches. |
145 | * That said the caller must assure the memcg's cache won't go away. Since once |
146 | * created a memcg's cache is destroyed only along with the root cache, it is |
147 | * true if we are going to allocate from the cache or hold a reference to the |
148 | * root cache by other means. Otherwise, we should hold either the slab_mutex |
149 | * or the memcg's slab_caches_mutex while calling this function and accessing |
150 | * the returned value. |
151 | */ |
152 | static inline struct kmem_cache * |
153 | cache_from_memcg_idx(struct kmem_cache *s, int idx) |
154 | { |
155 | struct kmem_cache *cachep; |
156 | struct memcg_cache_params *params; |
157 | |
158 | if (!s->memcg_params) |
159 | return NULL; |
160 | |
161 | rcu_read_lock(); |
162 | params = rcu_dereference(s->memcg_params); |
163 | cachep = params->memcg_caches[idx]; |
164 | rcu_read_unlock(); |
165 | |
166 | /* |
167 | * Make sure we will access the up-to-date value. The code updating |
168 | * memcg_caches issues a write barrier to match this (see |
169 | * memcg_register_cache()). |
170 | */ |
171 | smp_read_barrier_depends(); |
172 | return cachep; |
173 | } |
174 | |
175 | static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) |
176 | { |
177 | if (is_root_cache(s)) |
178 | return s; |
179 | return s->memcg_params->root_cache; |
180 | } |
181 | |
182 | static __always_inline int memcg_charge_slab(struct kmem_cache *s, |
183 | gfp_t gfp, int order) |
184 | { |
185 | if (!memcg_kmem_enabled()) |
186 | return 0; |
187 | if (is_root_cache(s)) |
188 | return 0; |
189 | return __memcg_charge_slab(s, gfp, order); |
190 | } |
191 | |
192 | static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order) |
193 | { |
194 | if (!memcg_kmem_enabled()) |
195 | return; |
196 | if (is_root_cache(s)) |
197 | return; |
198 | __memcg_uncharge_slab(s, order); |
199 | } |
200 | #else |
201 | static inline bool is_root_cache(struct kmem_cache *s) |
202 | { |
203 | return true; |
204 | } |
205 | |
206 | static inline bool slab_equal_or_root(struct kmem_cache *s, |
207 | struct kmem_cache *p) |
208 | { |
209 | return true; |
210 | } |
211 | |
212 | static inline const char *cache_name(struct kmem_cache *s) |
213 | { |
214 | return s->name; |
215 | } |
216 | |
217 | static inline struct kmem_cache * |
218 | cache_from_memcg_idx(struct kmem_cache *s, int idx) |
219 | { |
220 | return NULL; |
221 | } |
222 | |
223 | static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) |
224 | { |
225 | return s; |
226 | } |
227 | |
228 | static inline int memcg_charge_slab(struct kmem_cache *s, gfp_t gfp, int order) |
229 | { |
230 | return 0; |
231 | } |
232 | |
233 | static inline void memcg_uncharge_slab(struct kmem_cache *s, int order) |
234 | { |
235 | } |
236 | #endif |
237 | |
238 | static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) |
239 | { |
240 | struct kmem_cache *cachep; |
241 | struct page *page; |
242 | |
243 | /* |
244 | * When kmemcg is not being used, both assignments should return the |
245 | * same value. but we don't want to pay the assignment price in that |
246 | * case. If it is not compiled in, the compiler should be smart enough |
247 | * to not do even the assignment. In that case, slab_equal_or_root |
248 | * will also be a constant. |
249 | */ |
250 | if (!memcg_kmem_enabled() && !unlikely(s->flags & SLAB_DEBUG_FREE)) |
251 | return s; |
252 | |
253 | page = virt_to_head_page(x); |
254 | cachep = page->slab_cache; |
255 | if (slab_equal_or_root(cachep, s)) |
256 | return cachep; |
257 | |
258 | pr_err("%s: Wrong slab cache. %s but object is from %s\n", |
259 | __FUNCTION__, cachep->name, s->name); |
260 | WARN_ON_ONCE(1); |
261 | return s; |
262 | } |
263 | #endif |
264 | |
265 | |
266 | /* |
267 | * The slab lists for all objects. |
268 | */ |
269 | struct kmem_cache_node { |
270 | spinlock_t list_lock; |
271 | |
272 | #ifdef CONFIG_SLAB |
273 | struct list_head slabs_partial; /* partial list first, better asm code */ |
274 | struct list_head slabs_full; |
275 | struct list_head slabs_free; |
276 | unsigned long free_objects; |
277 | unsigned int free_limit; |
278 | unsigned int colour_next; /* Per-node cache coloring */ |
279 | struct array_cache *shared; /* shared per node */ |
280 | struct array_cache **alien; /* on other nodes */ |
281 | unsigned long next_reap; /* updated without locking */ |
282 | int free_touched; /* updated without locking */ |
283 | #endif |
284 | |
285 | #ifdef CONFIG_SLUB |
286 | unsigned long nr_partial; |
287 | struct list_head partial; |
288 | #ifdef CONFIG_SLUB_DEBUG |
289 | atomic_long_t nr_slabs; |
290 | atomic_long_t total_objects; |
291 | struct list_head full; |
292 | #endif |
293 | #endif |
294 | |
295 | }; |
296 | |
297 | void *slab_next(struct seq_file *m, void *p, loff_t *pos); |
298 | void slab_stop(struct seq_file *m, void *p); |
299 |
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