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 | c0a5b560 | 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 | c0a5b560 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 14 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 15 | #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB) |
Vladimir Davydov | c0a5b560 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 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 | } |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 40 | #endif /* CONFIG_MEMCG && !CONFIG_SLOB */ |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 41 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 42 | #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB) |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 43 | static inline bool list_lru_memcg_aware(struct list_lru *lru) |
| 44 | { |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 45 | /* |
| 46 | * This needs node 0 to be always present, even |
| 47 | * in the systems supporting sparse numa ids. |
| 48 | */ |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 49 | return !!lru->node[0].memcg_lrus; |
| 50 | } |
| 51 | |
| 52 | static inline struct list_lru_one * |
| 53 | list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx) |
| 54 | { |
| 55 | /* |
| 56 | * The lock protects the array of per cgroup lists from relocation |
| 57 | * (see memcg_update_list_lru_node). |
| 58 | */ |
| 59 | lockdep_assert_held(&nlru->lock); |
| 60 | if (nlru->memcg_lrus && idx >= 0) |
| 61 | return nlru->memcg_lrus->lru[idx]; |
| 62 | |
| 63 | return &nlru->lru; |
| 64 | } |
| 65 | |
Vladimir Davydov | df40655 | 2015-11-05 18:49:04 -0800 | [diff] [blame] | 66 | static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr) |
| 67 | { |
| 68 | struct page *page; |
| 69 | |
| 70 | if (!memcg_kmem_enabled()) |
| 71 | return NULL; |
| 72 | page = virt_to_head_page(ptr); |
| 73 | return page->mem_cgroup; |
| 74 | } |
| 75 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 76 | static inline struct list_lru_one * |
| 77 | list_lru_from_kmem(struct list_lru_node *nlru, void *ptr) |
| 78 | { |
| 79 | struct mem_cgroup *memcg; |
| 80 | |
| 81 | if (!nlru->memcg_lrus) |
| 82 | return &nlru->lru; |
| 83 | |
| 84 | memcg = mem_cgroup_from_kmem(ptr); |
| 85 | if (!memcg) |
| 86 | return &nlru->lru; |
| 87 | |
| 88 | return list_lru_from_memcg_idx(nlru, memcg_cache_id(memcg)); |
| 89 | } |
| 90 | #else |
| 91 | static inline bool list_lru_memcg_aware(struct list_lru *lru) |
| 92 | { |
| 93 | return false; |
| 94 | } |
| 95 | |
| 96 | static inline struct list_lru_one * |
| 97 | list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx) |
| 98 | { |
| 99 | return &nlru->lru; |
| 100 | } |
| 101 | |
| 102 | static inline struct list_lru_one * |
| 103 | list_lru_from_kmem(struct list_lru_node *nlru, void *ptr) |
| 104 | { |
| 105 | return &nlru->lru; |
| 106 | } |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 107 | #endif /* CONFIG_MEMCG && !CONFIG_SLOB */ |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 108 | |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 109 | bool list_lru_add(struct list_lru *lru, struct list_head *item) |
| 110 | { |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 111 | int nid = page_to_nid(virt_to_page(item)); |
| 112 | struct list_lru_node *nlru = &lru->node[nid]; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 113 | struct list_lru_one *l; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 114 | |
| 115 | spin_lock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 116 | if (list_empty(item)) { |
Jeff Layton | 26f5d76 | 2015-09-08 15:03:44 -0700 | [diff] [blame] | 117 | l = list_lru_from_kmem(nlru, item); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 118 | list_add_tail(item, &l->list); |
| 119 | l->nr_items++; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 120 | spin_unlock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 121 | return true; |
| 122 | } |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 123 | spin_unlock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 124 | return false; |
| 125 | } |
| 126 | EXPORT_SYMBOL_GPL(list_lru_add); |
| 127 | |
| 128 | bool list_lru_del(struct list_lru *lru, struct list_head *item) |
| 129 | { |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 130 | int nid = page_to_nid(virt_to_page(item)); |
| 131 | struct list_lru_node *nlru = &lru->node[nid]; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 132 | struct list_lru_one *l; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 133 | |
| 134 | spin_lock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 135 | if (!list_empty(item)) { |
Jeff Layton | 26f5d76 | 2015-09-08 15:03:44 -0700 | [diff] [blame] | 136 | l = list_lru_from_kmem(nlru, item); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 137 | list_del_init(item); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 138 | l->nr_items--; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 139 | spin_unlock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 140 | return true; |
| 141 | } |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 142 | spin_unlock(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 143 | return false; |
| 144 | } |
| 145 | EXPORT_SYMBOL_GPL(list_lru_del); |
| 146 | |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame] | 147 | void list_lru_isolate(struct list_lru_one *list, struct list_head *item) |
| 148 | { |
| 149 | list_del_init(item); |
| 150 | list->nr_items--; |
| 151 | } |
| 152 | EXPORT_SYMBOL_GPL(list_lru_isolate); |
| 153 | |
| 154 | void list_lru_isolate_move(struct list_lru_one *list, struct list_head *item, |
| 155 | struct list_head *head) |
| 156 | { |
| 157 | list_move(item, head); |
| 158 | list->nr_items--; |
| 159 | } |
| 160 | EXPORT_SYMBOL_GPL(list_lru_isolate_move); |
| 161 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 162 | static unsigned long __list_lru_count_one(struct list_lru *lru, |
| 163 | int nid, int memcg_idx) |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 164 | { |
Glauber Costa | 6a4f496 | 2013-08-28 10:18:02 +1000 | [diff] [blame] | 165 | struct list_lru_node *nlru = &lru->node[nid]; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 166 | struct list_lru_one *l; |
| 167 | unsigned long count; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 168 | |
Glauber Costa | 6a4f496 | 2013-08-28 10:18:02 +1000 | [diff] [blame] | 169 | spin_lock(&nlru->lock); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 170 | l = list_lru_from_memcg_idx(nlru, memcg_idx); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 171 | count = l->nr_items; |
Glauber Costa | 6a4f496 | 2013-08-28 10:18:02 +1000 | [diff] [blame] | 172 | spin_unlock(&nlru->lock); |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 173 | |
| 174 | return count; |
| 175 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 176 | |
| 177 | unsigned long list_lru_count_one(struct list_lru *lru, |
| 178 | int nid, struct mem_cgroup *memcg) |
| 179 | { |
| 180 | return __list_lru_count_one(lru, nid, memcg_cache_id(memcg)); |
| 181 | } |
| 182 | EXPORT_SYMBOL_GPL(list_lru_count_one); |
| 183 | |
| 184 | unsigned long list_lru_count_node(struct list_lru *lru, int nid) |
| 185 | { |
| 186 | long count = 0; |
| 187 | int memcg_idx; |
| 188 | |
| 189 | count += __list_lru_count_one(lru, nid, -1); |
| 190 | if (list_lru_memcg_aware(lru)) { |
| 191 | for_each_memcg_cache_index(memcg_idx) |
| 192 | count += __list_lru_count_one(lru, nid, memcg_idx); |
| 193 | } |
| 194 | return count; |
| 195 | } |
Glauber Costa | 6a4f496 | 2013-08-28 10:18:02 +1000 | [diff] [blame] | 196 | EXPORT_SYMBOL_GPL(list_lru_count_node); |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 197 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 198 | static unsigned long |
| 199 | __list_lru_walk_one(struct list_lru *lru, int nid, int memcg_idx, |
| 200 | list_lru_walk_cb isolate, void *cb_arg, |
| 201 | unsigned long *nr_to_walk) |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 202 | { |
| 203 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 204 | struct list_lru_node *nlru = &lru->node[nid]; |
| 205 | struct list_lru_one *l; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 206 | struct list_head *item, *n; |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 207 | unsigned long isolated = 0; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 208 | |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 209 | spin_lock(&nlru->lock); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 210 | l = list_lru_from_memcg_idx(nlru, memcg_idx); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 211 | restart: |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 212 | list_for_each_safe(item, n, &l->list) { |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 213 | enum lru_status ret; |
Dave Chinner | 5cedf721 | 2013-08-28 10:18:01 +1000 | [diff] [blame] | 214 | |
| 215 | /* |
| 216 | * decrement nr_to_walk first so that we don't livelock if we |
| 217 | * get stuck on large numbesr of LRU_RETRY items |
| 218 | */ |
Russell King | c56b097 | 2013-10-30 14:16:16 +0000 | [diff] [blame] | 219 | if (!*nr_to_walk) |
Dave Chinner | 5cedf721 | 2013-08-28 10:18:01 +1000 | [diff] [blame] | 220 | break; |
Russell King | c56b097 | 2013-10-30 14:16:16 +0000 | [diff] [blame] | 221 | --*nr_to_walk; |
Dave Chinner | 5cedf721 | 2013-08-28 10:18:01 +1000 | [diff] [blame] | 222 | |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame] | 223 | ret = isolate(item, l, &nlru->lock, cb_arg); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 224 | switch (ret) { |
Johannes Weiner | 449dd69 | 2014-04-03 14:47:56 -0700 | [diff] [blame] | 225 | case LRU_REMOVED_RETRY: |
| 226 | assert_spin_locked(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 227 | case LRU_REMOVED: |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 228 | isolated++; |
Johannes Weiner | 449dd69 | 2014-04-03 14:47:56 -0700 | [diff] [blame] | 229 | /* |
| 230 | * If the lru lock has been dropped, our list |
| 231 | * traversal is now invalid and so we have to |
| 232 | * restart from scratch. |
| 233 | */ |
| 234 | if (ret == LRU_REMOVED_RETRY) |
| 235 | goto restart; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 236 | break; |
| 237 | case LRU_ROTATE: |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 238 | list_move_tail(item, &l->list); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 239 | break; |
| 240 | case LRU_SKIP: |
| 241 | break; |
| 242 | case LRU_RETRY: |
Dave Chinner | 5cedf721 | 2013-08-28 10:18:01 +1000 | [diff] [blame] | 243 | /* |
| 244 | * The lru lock has been dropped, our list traversal is |
| 245 | * now invalid and so we have to restart from scratch. |
| 246 | */ |
Johannes Weiner | 449dd69 | 2014-04-03 14:47:56 -0700 | [diff] [blame] | 247 | assert_spin_locked(&nlru->lock); |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 248 | goto restart; |
| 249 | default: |
| 250 | BUG(); |
| 251 | } |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 252 | } |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 253 | |
| 254 | spin_unlock(&nlru->lock); |
| 255 | return isolated; |
| 256 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 257 | |
| 258 | unsigned long |
| 259 | list_lru_walk_one(struct list_lru *lru, int nid, struct mem_cgroup *memcg, |
| 260 | list_lru_walk_cb isolate, void *cb_arg, |
| 261 | unsigned long *nr_to_walk) |
| 262 | { |
| 263 | return __list_lru_walk_one(lru, nid, memcg_cache_id(memcg), |
| 264 | isolate, cb_arg, nr_to_walk); |
| 265 | } |
| 266 | EXPORT_SYMBOL_GPL(list_lru_walk_one); |
| 267 | |
| 268 | unsigned long list_lru_walk_node(struct list_lru *lru, int nid, |
| 269 | list_lru_walk_cb isolate, void *cb_arg, |
| 270 | unsigned long *nr_to_walk) |
| 271 | { |
| 272 | long isolated = 0; |
| 273 | int memcg_idx; |
| 274 | |
| 275 | isolated += __list_lru_walk_one(lru, nid, -1, isolate, cb_arg, |
| 276 | nr_to_walk); |
| 277 | if (*nr_to_walk > 0 && list_lru_memcg_aware(lru)) { |
| 278 | for_each_memcg_cache_index(memcg_idx) { |
| 279 | isolated += __list_lru_walk_one(lru, nid, memcg_idx, |
| 280 | isolate, cb_arg, nr_to_walk); |
| 281 | if (*nr_to_walk <= 0) |
| 282 | break; |
| 283 | } |
| 284 | } |
| 285 | return isolated; |
| 286 | } |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 287 | EXPORT_SYMBOL_GPL(list_lru_walk_node); |
| 288 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 289 | static void init_one_lru(struct list_lru_one *l) |
| 290 | { |
| 291 | INIT_LIST_HEAD(&l->list); |
| 292 | l->nr_items = 0; |
| 293 | } |
| 294 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 295 | #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB) |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 296 | static void __memcg_destroy_list_lru_node(struct list_lru_memcg *memcg_lrus, |
| 297 | int begin, int end) |
| 298 | { |
| 299 | int i; |
| 300 | |
| 301 | for (i = begin; i < end; i++) |
| 302 | kfree(memcg_lrus->lru[i]); |
| 303 | } |
| 304 | |
| 305 | static int __memcg_init_list_lru_node(struct list_lru_memcg *memcg_lrus, |
| 306 | int begin, int end) |
| 307 | { |
| 308 | int i; |
| 309 | |
| 310 | for (i = begin; i < end; i++) { |
| 311 | struct list_lru_one *l; |
| 312 | |
| 313 | l = kmalloc(sizeof(struct list_lru_one), GFP_KERNEL); |
| 314 | if (!l) |
| 315 | goto fail; |
| 316 | |
| 317 | init_one_lru(l); |
| 318 | memcg_lrus->lru[i] = l; |
| 319 | } |
| 320 | return 0; |
| 321 | fail: |
| 322 | __memcg_destroy_list_lru_node(memcg_lrus, begin, i - 1); |
| 323 | return -ENOMEM; |
| 324 | } |
| 325 | |
| 326 | static int memcg_init_list_lru_node(struct list_lru_node *nlru) |
| 327 | { |
| 328 | int size = memcg_nr_cache_ids; |
| 329 | |
| 330 | nlru->memcg_lrus = kmalloc(size * sizeof(void *), GFP_KERNEL); |
| 331 | if (!nlru->memcg_lrus) |
| 332 | return -ENOMEM; |
| 333 | |
| 334 | if (__memcg_init_list_lru_node(nlru->memcg_lrus, 0, size)) { |
| 335 | kfree(nlru->memcg_lrus); |
| 336 | return -ENOMEM; |
| 337 | } |
| 338 | |
| 339 | return 0; |
| 340 | } |
| 341 | |
| 342 | static void memcg_destroy_list_lru_node(struct list_lru_node *nlru) |
| 343 | { |
| 344 | __memcg_destroy_list_lru_node(nlru->memcg_lrus, 0, memcg_nr_cache_ids); |
| 345 | kfree(nlru->memcg_lrus); |
| 346 | } |
| 347 | |
| 348 | static int memcg_update_list_lru_node(struct list_lru_node *nlru, |
| 349 | int old_size, int new_size) |
| 350 | { |
| 351 | struct list_lru_memcg *old, *new; |
| 352 | |
| 353 | BUG_ON(old_size > new_size); |
| 354 | |
| 355 | old = nlru->memcg_lrus; |
| 356 | new = kmalloc(new_size * sizeof(void *), GFP_KERNEL); |
| 357 | if (!new) |
| 358 | return -ENOMEM; |
| 359 | |
| 360 | if (__memcg_init_list_lru_node(new, old_size, new_size)) { |
| 361 | kfree(new); |
| 362 | return -ENOMEM; |
| 363 | } |
| 364 | |
| 365 | memcpy(new, old, old_size * sizeof(void *)); |
| 366 | |
| 367 | /* |
| 368 | * The lock guarantees that we won't race with a reader |
| 369 | * (see list_lru_from_memcg_idx). |
| 370 | * |
| 371 | * Since list_lru_{add,del} may be called under an IRQ-safe lock, |
| 372 | * we have to use IRQ-safe primitives here to avoid deadlock. |
| 373 | */ |
| 374 | spin_lock_irq(&nlru->lock); |
| 375 | nlru->memcg_lrus = new; |
| 376 | spin_unlock_irq(&nlru->lock); |
| 377 | |
| 378 | kfree(old); |
| 379 | return 0; |
| 380 | } |
| 381 | |
| 382 | static void memcg_cancel_update_list_lru_node(struct list_lru_node *nlru, |
| 383 | int old_size, int new_size) |
| 384 | { |
| 385 | /* do not bother shrinking the array back to the old size, because we |
| 386 | * cannot handle allocation failures here */ |
| 387 | __memcg_destroy_list_lru_node(nlru->memcg_lrus, old_size, new_size); |
| 388 | } |
| 389 | |
| 390 | static int memcg_init_list_lru(struct list_lru *lru, bool memcg_aware) |
| 391 | { |
| 392 | int i; |
| 393 | |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 394 | if (!memcg_aware) |
| 395 | return 0; |
| 396 | |
| 397 | for_each_node(i) { |
| 398 | if (memcg_init_list_lru_node(&lru->node[i])) |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 399 | goto fail; |
| 400 | } |
| 401 | return 0; |
| 402 | fail: |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 403 | for (i = i - 1; i >= 0; i--) { |
| 404 | if (!lru->node[i].memcg_lrus) |
| 405 | continue; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 406 | memcg_destroy_list_lru_node(&lru->node[i]); |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 407 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 408 | return -ENOMEM; |
| 409 | } |
| 410 | |
| 411 | static void memcg_destroy_list_lru(struct list_lru *lru) |
| 412 | { |
| 413 | int i; |
| 414 | |
| 415 | if (!list_lru_memcg_aware(lru)) |
| 416 | return; |
| 417 | |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 418 | for_each_node(i) |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 419 | memcg_destroy_list_lru_node(&lru->node[i]); |
| 420 | } |
| 421 | |
| 422 | static int memcg_update_list_lru(struct list_lru *lru, |
| 423 | int old_size, int new_size) |
| 424 | { |
| 425 | int i; |
| 426 | |
| 427 | if (!list_lru_memcg_aware(lru)) |
| 428 | return 0; |
| 429 | |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 430 | for_each_node(i) { |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 431 | if (memcg_update_list_lru_node(&lru->node[i], |
| 432 | old_size, new_size)) |
| 433 | goto fail; |
| 434 | } |
| 435 | return 0; |
| 436 | fail: |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 437 | for (i = i - 1; i >= 0; i--) { |
| 438 | if (!lru->node[i].memcg_lrus) |
| 439 | continue; |
| 440 | |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 441 | memcg_cancel_update_list_lru_node(&lru->node[i], |
| 442 | old_size, new_size); |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 443 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 444 | return -ENOMEM; |
| 445 | } |
| 446 | |
| 447 | static void memcg_cancel_update_list_lru(struct list_lru *lru, |
| 448 | int old_size, int new_size) |
| 449 | { |
| 450 | int i; |
| 451 | |
| 452 | if (!list_lru_memcg_aware(lru)) |
| 453 | return; |
| 454 | |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 455 | for_each_node(i) |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 456 | memcg_cancel_update_list_lru_node(&lru->node[i], |
| 457 | old_size, new_size); |
| 458 | } |
| 459 | |
| 460 | int memcg_update_all_list_lrus(int new_size) |
| 461 | { |
| 462 | int ret = 0; |
| 463 | struct list_lru *lru; |
| 464 | int old_size = memcg_nr_cache_ids; |
| 465 | |
| 466 | mutex_lock(&list_lrus_mutex); |
| 467 | list_for_each_entry(lru, &list_lrus, list) { |
| 468 | ret = memcg_update_list_lru(lru, old_size, new_size); |
| 469 | if (ret) |
| 470 | goto fail; |
| 471 | } |
| 472 | out: |
| 473 | mutex_unlock(&list_lrus_mutex); |
| 474 | return ret; |
| 475 | fail: |
| 476 | list_for_each_entry_continue_reverse(lru, &list_lrus, list) |
| 477 | memcg_cancel_update_list_lru(lru, old_size, new_size); |
| 478 | goto out; |
| 479 | } |
Vladimir Davydov | 2788cf0 | 2015-02-12 14:59:38 -0800 | [diff] [blame] | 480 | |
| 481 | static void memcg_drain_list_lru_node(struct list_lru_node *nlru, |
| 482 | int src_idx, int dst_idx) |
| 483 | { |
| 484 | struct list_lru_one *src, *dst; |
| 485 | |
| 486 | /* |
| 487 | * Since list_lru_{add,del} may be called under an IRQ-safe lock, |
| 488 | * we have to use IRQ-safe primitives here to avoid deadlock. |
| 489 | */ |
| 490 | spin_lock_irq(&nlru->lock); |
| 491 | |
| 492 | src = list_lru_from_memcg_idx(nlru, src_idx); |
| 493 | dst = list_lru_from_memcg_idx(nlru, dst_idx); |
| 494 | |
| 495 | list_splice_init(&src->list, &dst->list); |
| 496 | dst->nr_items += src->nr_items; |
| 497 | src->nr_items = 0; |
| 498 | |
| 499 | spin_unlock_irq(&nlru->lock); |
| 500 | } |
| 501 | |
| 502 | static void memcg_drain_list_lru(struct list_lru *lru, |
| 503 | int src_idx, int dst_idx) |
| 504 | { |
| 505 | int i; |
| 506 | |
| 507 | if (!list_lru_memcg_aware(lru)) |
| 508 | return; |
| 509 | |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 510 | for_each_node(i) |
Vladimir Davydov | 2788cf0 | 2015-02-12 14:59:38 -0800 | [diff] [blame] | 511 | memcg_drain_list_lru_node(&lru->node[i], src_idx, dst_idx); |
| 512 | } |
| 513 | |
| 514 | void memcg_drain_all_list_lrus(int src_idx, int dst_idx) |
| 515 | { |
| 516 | struct list_lru *lru; |
| 517 | |
| 518 | mutex_lock(&list_lrus_mutex); |
| 519 | list_for_each_entry(lru, &list_lrus, list) |
| 520 | memcg_drain_list_lru(lru, src_idx, dst_idx); |
| 521 | mutex_unlock(&list_lrus_mutex); |
| 522 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 523 | #else |
| 524 | static int memcg_init_list_lru(struct list_lru *lru, bool memcg_aware) |
| 525 | { |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | static void memcg_destroy_list_lru(struct list_lru *lru) |
| 530 | { |
| 531 | } |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 532 | #endif /* CONFIG_MEMCG && !CONFIG_SLOB */ |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 533 | |
| 534 | int __list_lru_init(struct list_lru *lru, bool memcg_aware, |
| 535 | struct lock_class_key *key) |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 536 | { |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 537 | int i; |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 538 | size_t size = sizeof(*lru->node) * nr_node_ids; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 539 | int err = -ENOMEM; |
| 540 | |
| 541 | memcg_get_cache_ids(); |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 542 | |
| 543 | lru->node = kzalloc(size, GFP_KERNEL); |
| 544 | if (!lru->node) |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 545 | goto out; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 546 | |
Raghavendra K T | 145949a | 2015-11-05 18:46:26 -0800 | [diff] [blame] | 547 | for_each_node(i) { |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 548 | spin_lock_init(&lru->node[i].lock); |
Johannes Weiner | 449dd69 | 2014-04-03 14:47:56 -0700 | [diff] [blame] | 549 | if (key) |
| 550 | lockdep_set_class(&lru->node[i].lock, key); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 551 | init_one_lru(&lru->node[i].lru); |
Dave Chinner | 3b1d58a | 2013-08-28 10:18:00 +1000 | [diff] [blame] | 552 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 553 | |
| 554 | err = memcg_init_list_lru(lru, memcg_aware); |
| 555 | if (err) { |
| 556 | kfree(lru->node); |
| 557 | goto out; |
| 558 | } |
| 559 | |
Vladimir Davydov | c0a5b560 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 560 | list_lru_register(lru); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 561 | out: |
| 562 | memcg_put_cache_ids(); |
| 563 | return err; |
Dave Chinner | a38e408 | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 564 | } |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 565 | EXPORT_SYMBOL_GPL(__list_lru_init); |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 566 | |
| 567 | void list_lru_destroy(struct list_lru *lru) |
| 568 | { |
Vladimir Davydov | c0a5b560 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 569 | /* Already destroyed or not yet initialized? */ |
| 570 | if (!lru->node) |
| 571 | return; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 572 | |
| 573 | memcg_get_cache_ids(); |
| 574 | |
Vladimir Davydov | c0a5b560 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 575 | list_lru_unregister(lru); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 576 | |
| 577 | memcg_destroy_list_lru(lru); |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 578 | kfree(lru->node); |
Vladimir Davydov | c0a5b560 | 2015-02-12 14:59:07 -0800 | [diff] [blame] | 579 | lru->node = NULL; |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 580 | |
| 581 | memcg_put_cache_ids(); |
Glauber Costa | 5ca302c | 2013-08-28 10:18:18 +1000 | [diff] [blame] | 582 | } |
| 583 | EXPORT_SYMBOL_GPL(list_lru_destroy); |