Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2013 Red Hat, Inc. and Parallels Inc. All rights reserved. |
| 3 | * Authors: David Chinner and Glauber Costa |
| 4 | * |
| 5 | * Generic LRU infrastructure |
| 6 | */ |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/module.h> |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 9 | #include <linux/mm.h> |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 10 | #include <linux/list_lru.h> |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 11 | #include <linux/slab.h> |
Vladimir Davydov | c0a5b56 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 12 | #include <linux/mutex.h> |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 13 | #include <linux/memcontrol.h> |
Vladimir Davydov | c0a5b56 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 14 | |
| 15 | #ifdef CONFIG_MEMCG_KMEM |
| 16 | static LIST_HEAD(list_lrus); |
| 17 | static DEFINE_MUTEX(list_lrus_mutex); |
| 18 | |
| 19 | static void list_lru_register(struct list_lru *lru) |
| 20 | { |
| 21 | mutex_lock(&list_lrus_mutex); |
| 22 | list_add(&lru->list, &list_lrus); |
| 23 | mutex_unlock(&list_lrus_mutex); |
| 24 | } |
| 25 | |
| 26 | static void list_lru_unregister(struct list_lru *lru) |
| 27 | { |
| 28 | mutex_lock(&list_lrus_mutex); |
| 29 | list_del(&lru->list); |
| 30 | mutex_unlock(&list_lrus_mutex); |
| 31 | } |
| 32 | #else |
| 33 | static void list_lru_register(struct list_lru *lru) |
| 34 | { |
| 35 | } |
| 36 | |
| 37 | static void list_lru_unregister(struct list_lru *lru) |
| 38 | { |
| 39 | } |
| 40 | #endif /* CONFIG_MEMCG_KMEM */ |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 41 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 42 | #ifdef CONFIG_MEMCG_KMEM |
| 43 | static inline bool list_lru_memcg_aware(struct list_lru *lru) |
| 44 | { |
| 45 | return !!lru->node[0].memcg_lrus; |
| 46 | } |
| 47 | |
| 48 | static inline struct list_lru_one * |
| 49 | list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx) |
| 50 | { |
| 51 | /* |
| 52 | * The lock protects the array of per cgroup lists from relocation |
| 53 | * (see memcg_update_list_lru_node). |
| 54 | */ |
| 55 | lockdep_assert_held(&nlru->lock); |
| 56 | if (nlru->memcg_lrus && idx >= 0) |
| 57 | return nlru->memcg_lrus->lru[idx]; |
| 58 | |
| 59 | return &nlru->lru; |
| 60 | } |
| 61 | |
| 62 | static inline struct list_lru_one * |
| 63 | list_lru_from_kmem(struct list_lru_node *nlru, void *ptr) |
| 64 | { |
| 65 | struct mem_cgroup *memcg; |
| 66 | |
| 67 | if (!nlru->memcg_lrus) |
| 68 | return &nlru->lru; |
| 69 | |
| 70 | memcg = mem_cgroup_from_kmem(ptr); |
| 71 | if (!memcg) |
| 72 | return &nlru->lru; |
| 73 | |
| 74 | return list_lru_from_memcg_idx(nlru, memcg_cache_id(memcg)); |
| 75 | } |
| 76 | #else |
| 77 | static inline bool list_lru_memcg_aware(struct list_lru *lru) |
| 78 | { |
| 79 | return false; |
| 80 | } |
| 81 | |
| 82 | static inline struct list_lru_one * |
| 83 | list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx) |
| 84 | { |
| 85 | return &nlru->lru; |
| 86 | } |
| 87 | |
| 88 | static inline struct list_lru_one * |
| 89 | list_lru_from_kmem(struct list_lru_node *nlru, void *ptr) |
| 90 | { |
| 91 | return &nlru->lru; |
| 92 | } |
| 93 | #endif /* CONFIG_MEMCG_KMEM */ |
| 94 | |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 95 | bool list_lru_add(struct list_lru *lru, struct list_head *item) |
| 96 | { |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 97 | int nid = page_to_nid(virt_to_page(item)); |
| 98 | struct list_lru_node *nlru = &lru->node[nid]; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 99 | struct list_lru_one *l; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 100 | |
| 101 | spin_lock(&nlru->lock); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 102 | l = list_lru_from_kmem(nlru, item); |
| 103 | WARN_ON_ONCE(l->nr_items < 0); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 104 | if (list_empty(item)) { |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 105 | list_add_tail(item, &l->list); |
| 106 | l->nr_items++; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 107 | spin_unlock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 108 | return true; |
| 109 | } |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 110 | spin_unlock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 111 | return false; |
| 112 | } |
| 113 | EXPORT_SYMBOL_GPL(list_lru_add); |
| 114 | |
| 115 | bool list_lru_del(struct list_lru *lru, struct list_head *item) |
| 116 | { |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 117 | int nid = page_to_nid(virt_to_page(item)); |
| 118 | struct list_lru_node *nlru = &lru->node[nid]; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 119 | struct list_lru_one *l; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 120 | |
| 121 | spin_lock(&nlru->lock); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 122 | l = list_lru_from_kmem(nlru, item); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 123 | if (!list_empty(item)) { |
| 124 | list_del_init(item); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 125 | l->nr_items--; |
| 126 | WARN_ON_ONCE(l->nr_items < 0); |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 127 | spin_unlock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 128 | return true; |
| 129 | } |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 130 | spin_unlock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 131 | return false; |
| 132 | } |
| 133 | EXPORT_SYMBOL_GPL(list_lru_del); |
| 134 | |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame^] | 135 | void list_lru_isolate(struct list_lru_one *list, struct list_head *item) |
| 136 | { |
| 137 | list_del_init(item); |
| 138 | list->nr_items--; |
| 139 | } |
| 140 | EXPORT_SYMBOL_GPL(list_lru_isolate); |
| 141 | |
| 142 | void list_lru_isolate_move(struct list_lru_one *list, struct list_head *item, |
| 143 | struct list_head *head) |
| 144 | { |
| 145 | list_move(item, head); |
| 146 | list->nr_items--; |
| 147 | } |
| 148 | EXPORT_SYMBOL_GPL(list_lru_isolate_move); |
| 149 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 150 | static unsigned long __list_lru_count_one(struct list_lru *lru, |
| 151 | int nid, int memcg_idx) |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 152 | { |
Glauber Costa | 6a4f496 | 2013-08-28 10:18:02 +1000 | [diff] [blame] | 153 | struct list_lru_node *nlru = &lru->node[nid]; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 154 | struct list_lru_one *l; |
| 155 | unsigned long count; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 156 | |
Glauber Costa | 6a4f496 | 2013-08-28 10:18:02 +1000 | [diff] [blame] | 157 | spin_lock(&nlru->lock); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 158 | l = list_lru_from_memcg_idx(nlru, memcg_idx); |
| 159 | WARN_ON_ONCE(l->nr_items < 0); |
| 160 | count = l->nr_items; |
Glauber Costa | 6a4f496 | 2013-08-28 10:18:02 +1000 | [diff] [blame] | 161 | spin_unlock(&nlru->lock); |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 162 | |
| 163 | return count; |
| 164 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 165 | |
| 166 | unsigned long list_lru_count_one(struct list_lru *lru, |
| 167 | int nid, struct mem_cgroup *memcg) |
| 168 | { |
| 169 | return __list_lru_count_one(lru, nid, memcg_cache_id(memcg)); |
| 170 | } |
| 171 | EXPORT_SYMBOL_GPL(list_lru_count_one); |
| 172 | |
| 173 | unsigned long list_lru_count_node(struct list_lru *lru, int nid) |
| 174 | { |
| 175 | long count = 0; |
| 176 | int memcg_idx; |
| 177 | |
| 178 | count += __list_lru_count_one(lru, nid, -1); |
| 179 | if (list_lru_memcg_aware(lru)) { |
| 180 | for_each_memcg_cache_index(memcg_idx) |
| 181 | count += __list_lru_count_one(lru, nid, memcg_idx); |
| 182 | } |
| 183 | return count; |
| 184 | } |
Glauber Costa | 6a4f496 | 2013-08-28 10:18:02 +1000 | [diff] [blame] | 185 | EXPORT_SYMBOL_GPL(list_lru_count_node); |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 186 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 187 | static unsigned long |
| 188 | __list_lru_walk_one(struct list_lru *lru, int nid, int memcg_idx, |
| 189 | list_lru_walk_cb isolate, void *cb_arg, |
| 190 | unsigned long *nr_to_walk) |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 191 | { |
| 192 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 193 | struct list_lru_node *nlru = &lru->node[nid]; |
| 194 | struct list_lru_one *l; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 195 | struct list_head *item, *n; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 196 | unsigned long isolated = 0; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 197 | |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 198 | spin_lock(&nlru->lock); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 199 | l = list_lru_from_memcg_idx(nlru, memcg_idx); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 200 | restart: |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 201 | list_for_each_safe(item, n, &l->list) { |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 202 | enum lru_status ret; |
Dave Chinner | 5cedf721 | 2013-08-28 10:18:01 +1000 | [diff] [blame] | 203 | |
| 204 | /* |
| 205 | * decrement nr_to_walk first so that we don't livelock if we |
| 206 | * get stuck on large numbesr of LRU_RETRY items |
| 207 | */ |
Russell King | c56b097 | 2013-10-30 14:16:16 +0000 | [diff] [blame] | 208 | if (!*nr_to_walk) |
Dave Chinner | 5cedf721 | 2013-08-28 10:18:01 +1000 | [diff] [blame] | 209 | break; |
Russell King | c56b097 | 2013-10-30 14:16:16 +0000 | [diff] [blame] | 210 | --*nr_to_walk; |
Dave Chinner | 5cedf721 | 2013-08-28 10:18:01 +1000 | [diff] [blame] | 211 | |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame^] | 212 | ret = isolate(item, l, &nlru->lock, cb_arg); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 213 | switch (ret) { |
Johannes Weiner | 449dd69 | 2014-04-03 14:47:56 -0700 | [diff] [blame] | 214 | case LRU_REMOVED_RETRY: |
| 215 | assert_spin_locked(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 216 | case LRU_REMOVED: |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 217 | isolated++; |
Johannes Weiner | 449dd69 | 2014-04-03 14:47:56 -0700 | [diff] [blame] | 218 | /* |
| 219 | * If the lru lock has been dropped, our list |
| 220 | * traversal is now invalid and so we have to |
| 221 | * restart from scratch. |
| 222 | */ |
| 223 | if (ret == LRU_REMOVED_RETRY) |
| 224 | goto restart; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 225 | break; |
| 226 | case LRU_ROTATE: |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 227 | list_move_tail(item, &l->list); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 228 | break; |
| 229 | case LRU_SKIP: |
| 230 | break; |
| 231 | case LRU_RETRY: |
Dave Chinner | 5cedf721 | 2013-08-28 10:18:01 +1000 | [diff] [blame] | 232 | /* |
| 233 | * The lru lock has been dropped, our list traversal is |
| 234 | * now invalid and so we have to restart from scratch. |
| 235 | */ |
Johannes Weiner | 449dd69 | 2014-04-03 14:47:56 -0700 | [diff] [blame] | 236 | assert_spin_locked(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 237 | goto restart; |
| 238 | default: |
| 239 | BUG(); |
| 240 | } |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 241 | } |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 242 | |
| 243 | spin_unlock(&nlru->lock); |
| 244 | return isolated; |
| 245 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 246 | |
| 247 | unsigned long |
| 248 | list_lru_walk_one(struct list_lru *lru, int nid, struct mem_cgroup *memcg, |
| 249 | list_lru_walk_cb isolate, void *cb_arg, |
| 250 | unsigned long *nr_to_walk) |
| 251 | { |
| 252 | return __list_lru_walk_one(lru, nid, memcg_cache_id(memcg), |
| 253 | isolate, cb_arg, nr_to_walk); |
| 254 | } |
| 255 | EXPORT_SYMBOL_GPL(list_lru_walk_one); |
| 256 | |
| 257 | unsigned long list_lru_walk_node(struct list_lru *lru, int nid, |
| 258 | list_lru_walk_cb isolate, void *cb_arg, |
| 259 | unsigned long *nr_to_walk) |
| 260 | { |
| 261 | long isolated = 0; |
| 262 | int memcg_idx; |
| 263 | |
| 264 | isolated += __list_lru_walk_one(lru, nid, -1, isolate, cb_arg, |
| 265 | nr_to_walk); |
| 266 | if (*nr_to_walk > 0 && list_lru_memcg_aware(lru)) { |
| 267 | for_each_memcg_cache_index(memcg_idx) { |
| 268 | isolated += __list_lru_walk_one(lru, nid, memcg_idx, |
| 269 | isolate, cb_arg, nr_to_walk); |
| 270 | if (*nr_to_walk <= 0) |
| 271 | break; |
| 272 | } |
| 273 | } |
| 274 | return isolated; |
| 275 | } |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 276 | EXPORT_SYMBOL_GPL(list_lru_walk_node); |
| 277 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 278 | static void init_one_lru(struct list_lru_one *l) |
| 279 | { |
| 280 | INIT_LIST_HEAD(&l->list); |
| 281 | l->nr_items = 0; |
| 282 | } |
| 283 | |
| 284 | #ifdef CONFIG_MEMCG_KMEM |
| 285 | static void __memcg_destroy_list_lru_node(struct list_lru_memcg *memcg_lrus, |
| 286 | int begin, int end) |
| 287 | { |
| 288 | int i; |
| 289 | |
| 290 | for (i = begin; i < end; i++) |
| 291 | kfree(memcg_lrus->lru[i]); |
| 292 | } |
| 293 | |
| 294 | static int __memcg_init_list_lru_node(struct list_lru_memcg *memcg_lrus, |
| 295 | int begin, int end) |
| 296 | { |
| 297 | int i; |
| 298 | |
| 299 | for (i = begin; i < end; i++) { |
| 300 | struct list_lru_one *l; |
| 301 | |
| 302 | l = kmalloc(sizeof(struct list_lru_one), GFP_KERNEL); |
| 303 | if (!l) |
| 304 | goto fail; |
| 305 | |
| 306 | init_one_lru(l); |
| 307 | memcg_lrus->lru[i] = l; |
| 308 | } |
| 309 | return 0; |
| 310 | fail: |
| 311 | __memcg_destroy_list_lru_node(memcg_lrus, begin, i - 1); |
| 312 | return -ENOMEM; |
| 313 | } |
| 314 | |
| 315 | static int memcg_init_list_lru_node(struct list_lru_node *nlru) |
| 316 | { |
| 317 | int size = memcg_nr_cache_ids; |
| 318 | |
| 319 | nlru->memcg_lrus = kmalloc(size * sizeof(void *), GFP_KERNEL); |
| 320 | if (!nlru->memcg_lrus) |
| 321 | return -ENOMEM; |
| 322 | |
| 323 | if (__memcg_init_list_lru_node(nlru->memcg_lrus, 0, size)) { |
| 324 | kfree(nlru->memcg_lrus); |
| 325 | return -ENOMEM; |
| 326 | } |
| 327 | |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | static void memcg_destroy_list_lru_node(struct list_lru_node *nlru) |
| 332 | { |
| 333 | __memcg_destroy_list_lru_node(nlru->memcg_lrus, 0, memcg_nr_cache_ids); |
| 334 | kfree(nlru->memcg_lrus); |
| 335 | } |
| 336 | |
| 337 | static int memcg_update_list_lru_node(struct list_lru_node *nlru, |
| 338 | int old_size, int new_size) |
| 339 | { |
| 340 | struct list_lru_memcg *old, *new; |
| 341 | |
| 342 | BUG_ON(old_size > new_size); |
| 343 | |
| 344 | old = nlru->memcg_lrus; |
| 345 | new = kmalloc(new_size * sizeof(void *), GFP_KERNEL); |
| 346 | if (!new) |
| 347 | return -ENOMEM; |
| 348 | |
| 349 | if (__memcg_init_list_lru_node(new, old_size, new_size)) { |
| 350 | kfree(new); |
| 351 | return -ENOMEM; |
| 352 | } |
| 353 | |
| 354 | memcpy(new, old, old_size * sizeof(void *)); |
| 355 | |
| 356 | /* |
| 357 | * The lock guarantees that we won't race with a reader |
| 358 | * (see list_lru_from_memcg_idx). |
| 359 | * |
| 360 | * Since list_lru_{add,del} may be called under an IRQ-safe lock, |
| 361 | * we have to use IRQ-safe primitives here to avoid deadlock. |
| 362 | */ |
| 363 | spin_lock_irq(&nlru->lock); |
| 364 | nlru->memcg_lrus = new; |
| 365 | spin_unlock_irq(&nlru->lock); |
| 366 | |
| 367 | kfree(old); |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | static void memcg_cancel_update_list_lru_node(struct list_lru_node *nlru, |
| 372 | int old_size, int new_size) |
| 373 | { |
| 374 | /* do not bother shrinking the array back to the old size, because we |
| 375 | * cannot handle allocation failures here */ |
| 376 | __memcg_destroy_list_lru_node(nlru->memcg_lrus, old_size, new_size); |
| 377 | } |
| 378 | |
| 379 | static int memcg_init_list_lru(struct list_lru *lru, bool memcg_aware) |
| 380 | { |
| 381 | int i; |
| 382 | |
| 383 | for (i = 0; i < nr_node_ids; i++) { |
| 384 | if (!memcg_aware) |
| 385 | lru->node[i].memcg_lrus = NULL; |
| 386 | else if (memcg_init_list_lru_node(&lru->node[i])) |
| 387 | goto fail; |
| 388 | } |
| 389 | return 0; |
| 390 | fail: |
| 391 | for (i = i - 1; i >= 0; i--) |
| 392 | memcg_destroy_list_lru_node(&lru->node[i]); |
| 393 | return -ENOMEM; |
| 394 | } |
| 395 | |
| 396 | static void memcg_destroy_list_lru(struct list_lru *lru) |
| 397 | { |
| 398 | int i; |
| 399 | |
| 400 | if (!list_lru_memcg_aware(lru)) |
| 401 | return; |
| 402 | |
| 403 | for (i = 0; i < nr_node_ids; i++) |
| 404 | memcg_destroy_list_lru_node(&lru->node[i]); |
| 405 | } |
| 406 | |
| 407 | static int memcg_update_list_lru(struct list_lru *lru, |
| 408 | int old_size, int new_size) |
| 409 | { |
| 410 | int i; |
| 411 | |
| 412 | if (!list_lru_memcg_aware(lru)) |
| 413 | return 0; |
| 414 | |
| 415 | for (i = 0; i < nr_node_ids; i++) { |
| 416 | if (memcg_update_list_lru_node(&lru->node[i], |
| 417 | old_size, new_size)) |
| 418 | goto fail; |
| 419 | } |
| 420 | return 0; |
| 421 | fail: |
| 422 | for (i = i - 1; i >= 0; i--) |
| 423 | memcg_cancel_update_list_lru_node(&lru->node[i], |
| 424 | old_size, new_size); |
| 425 | return -ENOMEM; |
| 426 | } |
| 427 | |
| 428 | static void memcg_cancel_update_list_lru(struct list_lru *lru, |
| 429 | int old_size, int new_size) |
| 430 | { |
| 431 | int i; |
| 432 | |
| 433 | if (!list_lru_memcg_aware(lru)) |
| 434 | return; |
| 435 | |
| 436 | for (i = 0; i < nr_node_ids; i++) |
| 437 | memcg_cancel_update_list_lru_node(&lru->node[i], |
| 438 | old_size, new_size); |
| 439 | } |
| 440 | |
| 441 | int memcg_update_all_list_lrus(int new_size) |
| 442 | { |
| 443 | int ret = 0; |
| 444 | struct list_lru *lru; |
| 445 | int old_size = memcg_nr_cache_ids; |
| 446 | |
| 447 | mutex_lock(&list_lrus_mutex); |
| 448 | list_for_each_entry(lru, &list_lrus, list) { |
| 449 | ret = memcg_update_list_lru(lru, old_size, new_size); |
| 450 | if (ret) |
| 451 | goto fail; |
| 452 | } |
| 453 | out: |
| 454 | mutex_unlock(&list_lrus_mutex); |
| 455 | return ret; |
| 456 | fail: |
| 457 | list_for_each_entry_continue_reverse(lru, &list_lrus, list) |
| 458 | memcg_cancel_update_list_lru(lru, old_size, new_size); |
| 459 | goto out; |
| 460 | } |
| 461 | #else |
| 462 | static int memcg_init_list_lru(struct list_lru *lru, bool memcg_aware) |
| 463 | { |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | static void memcg_destroy_list_lru(struct list_lru *lru) |
| 468 | { |
| 469 | } |
| 470 | #endif /* CONFIG_MEMCG_KMEM */ |
| 471 | |
| 472 | int __list_lru_init(struct list_lru *lru, bool memcg_aware, |
| 473 | struct lock_class_key *key) |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 474 | { |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 475 | int i; |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 476 | size_t size = sizeof(*lru->node) * nr_node_ids; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 477 | int err = -ENOMEM; |
| 478 | |
| 479 | memcg_get_cache_ids(); |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 480 | |
| 481 | lru->node = kzalloc(size, GFP_KERNEL); |
| 482 | if (!lru->node) |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 483 | goto out; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 484 | |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 485 | for (i = 0; i < nr_node_ids; i++) { |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 486 | spin_lock_init(&lru->node[i].lock); |
Johannes Weiner | 449dd69 | 2014-04-03 14:47:56 -0700 | [diff] [blame] | 487 | if (key) |
| 488 | lockdep_set_class(&lru->node[i].lock, key); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 489 | init_one_lru(&lru->node[i].lru); |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 490 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 491 | |
| 492 | err = memcg_init_list_lru(lru, memcg_aware); |
| 493 | if (err) { |
| 494 | kfree(lru->node); |
| 495 | goto out; |
| 496 | } |
| 497 | |
Vladimir Davydov | c0a5b56 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 498 | list_lru_register(lru); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 499 | out: |
| 500 | memcg_put_cache_ids(); |
| 501 | return err; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 502 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 503 | EXPORT_SYMBOL_GPL(__list_lru_init); |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 504 | |
| 505 | void list_lru_destroy(struct list_lru *lru) |
| 506 | { |
Vladimir Davydov | c0a5b56 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 507 | /* Already destroyed or not yet initialized? */ |
| 508 | if (!lru->node) |
| 509 | return; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 510 | |
| 511 | memcg_get_cache_ids(); |
| 512 | |
Vladimir Davydov | c0a5b56 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 513 | list_lru_unregister(lru); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 514 | |
| 515 | memcg_destroy_list_lru(lru); |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 516 | kfree(lru->node); |
Vladimir Davydov | c0a5b56 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 517 | lru->node = NULL; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 518 | |
| 519 | memcg_put_cache_ids(); |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 520 | } |
| 521 | EXPORT_SYMBOL_GPL(list_lru_destroy); |