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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(struct mem_cgroup *memcg, const char *name, size_t size, |
59 | size_t align, unsigned long flags, void (*ctor)(void *)); |
60 | #else |
61 | static inline struct kmem_cache * |
62 | __kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size, |
63 | size_t align, 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 | |
95 | struct seq_file; |
96 | struct file; |
97 | |
98 | struct slabinfo { |
99 | unsigned long active_objs; |
100 | unsigned long num_objs; |
101 | unsigned long active_slabs; |
102 | unsigned long num_slabs; |
103 | unsigned long shared_avail; |
104 | unsigned int limit; |
105 | unsigned int batchcount; |
106 | unsigned int shared; |
107 | unsigned int objects_per_slab; |
108 | unsigned int cache_order; |
109 | }; |
110 | |
111 | void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); |
112 | void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); |
113 | ssize_t slabinfo_write(struct file *file, const char __user *buffer, |
114 | size_t count, loff_t *ppos); |
115 | |
116 | #ifdef CONFIG_MEMCG_KMEM |
117 | static inline bool is_root_cache(struct kmem_cache *s) |
118 | { |
119 | return !s->memcg_params || s->memcg_params->is_root_cache; |
120 | } |
121 | |
122 | static inline bool cache_match_memcg(struct kmem_cache *cachep, |
123 | struct mem_cgroup *memcg) |
124 | { |
125 | return (is_root_cache(cachep) && !memcg) || |
126 | (cachep->memcg_params->memcg == memcg); |
127 | } |
128 | |
129 | static inline void memcg_bind_pages(struct kmem_cache *s, int order) |
130 | { |
131 | if (!is_root_cache(s)) |
132 | atomic_add(1 << order, &s->memcg_params->nr_pages); |
133 | } |
134 | |
135 | static inline void memcg_release_pages(struct kmem_cache *s, int order) |
136 | { |
137 | if (is_root_cache(s)) |
138 | return; |
139 | |
140 | if (atomic_sub_and_test((1 << order), &s->memcg_params->nr_pages)) |
141 | mem_cgroup_destroy_cache(s); |
142 | } |
143 | |
144 | static inline bool slab_equal_or_root(struct kmem_cache *s, |
145 | struct kmem_cache *p) |
146 | { |
147 | return (p == s) || |
148 | (s->memcg_params && (p == s->memcg_params->root_cache)); |
149 | } |
150 | |
151 | /* |
152 | * We use suffixes to the name in memcg because we can't have caches |
153 | * created in the system with the same name. But when we print them |
154 | * locally, better refer to them with the base name |
155 | */ |
156 | static inline const char *cache_name(struct kmem_cache *s) |
157 | { |
158 | if (!is_root_cache(s)) |
159 | return s->memcg_params->root_cache->name; |
160 | return s->name; |
161 | } |
162 | |
163 | static inline struct kmem_cache * |
164 | cache_from_memcg_idx(struct kmem_cache *s, int idx) |
165 | { |
166 | if (!s->memcg_params) |
167 | return NULL; |
168 | return s->memcg_params->memcg_caches[idx]; |
169 | } |
170 | |
171 | static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) |
172 | { |
173 | if (is_root_cache(s)) |
174 | return s; |
175 | return s->memcg_params->root_cache; |
176 | } |
177 | #else |
178 | static inline bool is_root_cache(struct kmem_cache *s) |
179 | { |
180 | return true; |
181 | } |
182 | |
183 | static inline bool cache_match_memcg(struct kmem_cache *cachep, |
184 | struct mem_cgroup *memcg) |
185 | { |
186 | return true; |
187 | } |
188 | |
189 | static inline void memcg_bind_pages(struct kmem_cache *s, int order) |
190 | { |
191 | } |
192 | |
193 | static inline void memcg_release_pages(struct kmem_cache *s, int order) |
194 | { |
195 | } |
196 | |
197 | static inline bool slab_equal_or_root(struct kmem_cache *s, |
198 | struct kmem_cache *p) |
199 | { |
200 | return true; |
201 | } |
202 | |
203 | static inline const char *cache_name(struct kmem_cache *s) |
204 | { |
205 | return s->name; |
206 | } |
207 | |
208 | static inline struct kmem_cache * |
209 | cache_from_memcg_idx(struct kmem_cache *s, int idx) |
210 | { |
211 | return NULL; |
212 | } |
213 | |
214 | static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) |
215 | { |
216 | return s; |
217 | } |
218 | #endif |
219 | |
220 | static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) |
221 | { |
222 | struct kmem_cache *cachep; |
223 | struct page *page; |
224 | |
225 | /* |
226 | * When kmemcg is not being used, both assignments should return the |
227 | * same value. but we don't want to pay the assignment price in that |
228 | * case. If it is not compiled in, the compiler should be smart enough |
229 | * to not do even the assignment. In that case, slab_equal_or_root |
230 | * will also be a constant. |
231 | */ |
232 | if (!memcg_kmem_enabled() && !unlikely(s->flags & SLAB_DEBUG_FREE)) |
233 | return s; |
234 | |
235 | page = virt_to_head_page(x); |
236 | cachep = page->slab_cache; |
237 | if (slab_equal_or_root(cachep, s)) |
238 | return cachep; |
239 | |
240 | pr_err("%s: Wrong slab cache. %s but object is from %s\n", |
241 | __FUNCTION__, cachep->name, s->name); |
242 | WARN_ON_ONCE(1); |
243 | return s; |
244 | } |
245 | #endif |
246 | |
247 | |
248 | /* |
249 | * The slab lists for all objects. |
250 | */ |
251 | struct kmem_cache_node { |
252 | spinlock_t list_lock; |
253 | |
254 | #ifdef CONFIG_SLAB |
255 | struct list_head slabs_partial; /* partial list first, better asm code */ |
256 | struct list_head slabs_full; |
257 | struct list_head slabs_free; |
258 | unsigned long free_objects; |
259 | unsigned int free_limit; |
260 | unsigned int colour_next; /* Per-node cache coloring */ |
261 | struct array_cache *shared; /* shared per node */ |
262 | struct array_cache **alien; /* on other nodes */ |
263 | unsigned long next_reap; /* updated without locking */ |
264 | int free_touched; /* updated without locking */ |
265 | #endif |
266 | |
267 | #ifdef CONFIG_SLUB |
268 | unsigned long nr_partial; |
269 | struct list_head partial; |
270 | #ifdef CONFIG_SLUB_DEBUG |
271 | atomic_long_t nr_slabs; |
272 | atomic_long_t total_objects; |
273 | struct list_head full; |
274 | #endif |
275 | #endif |
276 | |
277 | }; |
278 | |
279 | void *slab_next(struct seq_file *m, void *p, loff_t *pos); |
280 | void slab_stop(struct seq_file *m, void *p); |
281 |
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