Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1 | /* memcontrol.c - Memory Controller |
| 2 | * |
| 3 | * Copyright IBM Corporation, 2007 |
| 4 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> |
| 5 | * |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 6 | * Copyright 2007 OpenVZ SWsoft Inc |
| 7 | * Author: Pavel Emelianov <xemul@openvz.org> |
| 8 | * |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 9 | * Memory thresholds |
| 10 | * Copyright (C) 2009 Nokia Corporation |
| 11 | * Author: Kirill A. Shutemov |
| 12 | * |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/res_counter.h> |
| 25 | #include <linux/memcontrol.h> |
| 26 | #include <linux/cgroup.h> |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 27 | #include <linux/mm.h> |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 28 | #include <linux/hugetlb.h> |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 29 | #include <linux/pagemap.h> |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 30 | #include <linux/smp.h> |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 31 | #include <linux/page-flags.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 32 | #include <linux/backing-dev.h> |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 33 | #include <linux/bit_spinlock.h> |
| 34 | #include <linux/rcupdate.h> |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 35 | #include <linux/limits.h> |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 36 | #include <linux/mutex.h> |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 37 | #include <linux/rbtree.h> |
Balbir Singh | b6ac57d | 2008-04-29 01:00:19 -0700 | [diff] [blame] | 38 | #include <linux/slab.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 39 | #include <linux/swap.h> |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 40 | #include <linux/swapops.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 41 | #include <linux/spinlock.h> |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 42 | #include <linux/eventfd.h> |
| 43 | #include <linux/sort.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 44 | #include <linux/fs.h> |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 45 | #include <linux/seq_file.h> |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 46 | #include <linux/vmalloc.h> |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 47 | #include <linux/mm_inline.h> |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 48 | #include <linux/page_cgroup.h> |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 49 | #include <linux/cpu.h> |
KAMEZAWA Hiroyuki | 158e0a2 | 2010-08-10 18:03:00 -0700 | [diff] [blame] | 50 | #include <linux/oom.h> |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 51 | #include "internal.h" |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 52 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 53 | #include <asm/uaccess.h> |
| 54 | |
KOSAKI Motohiro | cc8e970 | 2010-08-09 17:19:57 -0700 | [diff] [blame] | 55 | #include <trace/events/vmscan.h> |
| 56 | |
KAMEZAWA Hiroyuki | a181b0e | 2008-07-25 01:47:08 -0700 | [diff] [blame] | 57 | struct cgroup_subsys mem_cgroup_subsys __read_mostly; |
KAMEZAWA Hiroyuki | a181b0e | 2008-07-25 01:47:08 -0700 | [diff] [blame] | 58 | #define MEM_CGROUP_RECLAIM_RETRIES 5 |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 59 | struct mem_cgroup *root_mem_cgroup __read_mostly; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 60 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 61 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
Li Zefan | 338c843 | 2009-06-17 16:27:15 -0700 | [diff] [blame] | 62 | /* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */ |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 63 | int do_swap_account __read_mostly; |
Michal Hocko | a42c390 | 2010-11-24 12:57:08 -0800 | [diff] [blame] | 64 | |
| 65 | /* for remember boot option*/ |
| 66 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED |
| 67 | static int really_do_swap_account __initdata = 1; |
| 68 | #else |
| 69 | static int really_do_swap_account __initdata = 0; |
| 70 | #endif |
| 71 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 72 | #else |
| 73 | #define do_swap_account (0) |
| 74 | #endif |
| 75 | |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 76 | /* |
| 77 | * Per memcg event counter is incremented at every pagein/pageout. This counter |
| 78 | * is used for trigger some periodic events. This is straightforward and better |
| 79 | * than using jiffies etc. to handle periodic memcg event. |
| 80 | * |
| 81 | * These values will be used as !((event) & ((1 <<(thresh)) - 1)) |
| 82 | */ |
| 83 | #define THRESHOLDS_EVENTS_THRESH (7) /* once in 128 */ |
| 84 | #define SOFTLIMIT_EVENTS_THRESH (10) /* once in 1024 */ |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 85 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 86 | /* |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 87 | * Statistics for memory cgroup. |
| 88 | */ |
| 89 | enum mem_cgroup_stat_index { |
| 90 | /* |
| 91 | * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. |
| 92 | */ |
| 93 | MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 94 | MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */ |
KAMEZAWA Hiroyuki | d804658 | 2009-12-15 16:47:09 -0800 | [diff] [blame] | 95 | MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */ |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 96 | MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */ |
| 97 | MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */ |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 98 | MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */ |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 99 | MEM_CGROUP_STAT_DATA, /* end of data requires synchronization */ |
| 100 | /* incremented at every pagein/pageout */ |
| 101 | MEM_CGROUP_EVENTS = MEM_CGROUP_STAT_DATA, |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 102 | MEM_CGROUP_ON_MOVE, /* someone is moving account between groups */ |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 103 | |
| 104 | MEM_CGROUP_STAT_NSTATS, |
| 105 | }; |
| 106 | |
| 107 | struct mem_cgroup_stat_cpu { |
| 108 | s64 count[MEM_CGROUP_STAT_NSTATS]; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 109 | }; |
| 110 | |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 111 | /* |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 112 | * per-zone information in memory controller. |
| 113 | */ |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 114 | struct mem_cgroup_per_zone { |
KAMEZAWA Hiroyuki | 072c56c | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 115 | /* |
| 116 | * spin_lock to protect the per cgroup LRU |
| 117 | */ |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 118 | struct list_head lists[NR_LRU_LISTS]; |
| 119 | unsigned long count[NR_LRU_LISTS]; |
KOSAKI Motohiro | 3e2f41f | 2009-01-07 18:08:20 -0800 | [diff] [blame] | 120 | |
| 121 | struct zone_reclaim_stat reclaim_stat; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 122 | struct rb_node tree_node; /* RB tree node */ |
| 123 | unsigned long long usage_in_excess;/* Set to the value by which */ |
| 124 | /* the soft limit is exceeded*/ |
| 125 | bool on_tree; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 126 | struct mem_cgroup *mem; /* Back pointer, we cannot */ |
| 127 | /* use container_of */ |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 128 | }; |
| 129 | /* Macro for accessing counter */ |
| 130 | #define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)]) |
| 131 | |
| 132 | struct mem_cgroup_per_node { |
| 133 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; |
| 134 | }; |
| 135 | |
| 136 | struct mem_cgroup_lru_info { |
| 137 | struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES]; |
| 138 | }; |
| 139 | |
| 140 | /* |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 141 | * Cgroups above their limits are maintained in a RB-Tree, independent of |
| 142 | * their hierarchy representation |
| 143 | */ |
| 144 | |
| 145 | struct mem_cgroup_tree_per_zone { |
| 146 | struct rb_root rb_root; |
| 147 | spinlock_t lock; |
| 148 | }; |
| 149 | |
| 150 | struct mem_cgroup_tree_per_node { |
| 151 | struct mem_cgroup_tree_per_zone rb_tree_per_zone[MAX_NR_ZONES]; |
| 152 | }; |
| 153 | |
| 154 | struct mem_cgroup_tree { |
| 155 | struct mem_cgroup_tree_per_node *rb_tree_per_node[MAX_NUMNODES]; |
| 156 | }; |
| 157 | |
| 158 | static struct mem_cgroup_tree soft_limit_tree __read_mostly; |
| 159 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 160 | struct mem_cgroup_threshold { |
| 161 | struct eventfd_ctx *eventfd; |
| 162 | u64 threshold; |
| 163 | }; |
| 164 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 165 | /* For threshold */ |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 166 | struct mem_cgroup_threshold_ary { |
| 167 | /* An array index points to threshold just below usage. */ |
Phil Carmody | 5407a56 | 2010-05-26 14:42:42 -0700 | [diff] [blame] | 168 | int current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 169 | /* Size of entries[] */ |
| 170 | unsigned int size; |
| 171 | /* Array of thresholds */ |
| 172 | struct mem_cgroup_threshold entries[0]; |
| 173 | }; |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 174 | |
| 175 | struct mem_cgroup_thresholds { |
| 176 | /* Primary thresholds array */ |
| 177 | struct mem_cgroup_threshold_ary *primary; |
| 178 | /* |
| 179 | * Spare threshold array. |
| 180 | * This is needed to make mem_cgroup_unregister_event() "never fail". |
| 181 | * It must be able to store at least primary->size - 1 entries. |
| 182 | */ |
| 183 | struct mem_cgroup_threshold_ary *spare; |
| 184 | }; |
| 185 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 186 | /* for OOM */ |
| 187 | struct mem_cgroup_eventfd_list { |
| 188 | struct list_head list; |
| 189 | struct eventfd_ctx *eventfd; |
| 190 | }; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 191 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 192 | static void mem_cgroup_threshold(struct mem_cgroup *mem); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 193 | static void mem_cgroup_oom_notify(struct mem_cgroup *mem); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 194 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 195 | /* |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 196 | * The memory controller data structure. The memory controller controls both |
| 197 | * page cache and RSS per cgroup. We would eventually like to provide |
| 198 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, |
| 199 | * to help the administrator determine what knobs to tune. |
| 200 | * |
| 201 | * TODO: Add a water mark for the memory controller. Reclaim will begin when |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 202 | * we hit the water mark. May be even add a low water mark, such that |
| 203 | * no reclaim occurs from a cgroup at it's low water mark, this is |
| 204 | * a feature that will be implemented much later in the future. |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 205 | */ |
| 206 | struct mem_cgroup { |
| 207 | struct cgroup_subsys_state css; |
| 208 | /* |
| 209 | * the counter to account for memory usage |
| 210 | */ |
| 211 | struct res_counter res; |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 212 | /* |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 213 | * the counter to account for mem+swap usage. |
| 214 | */ |
| 215 | struct res_counter memsw; |
| 216 | /* |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 217 | * Per cgroup active and inactive list, similar to the |
| 218 | * per zone LRU lists. |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 219 | */ |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 220 | struct mem_cgroup_lru_info info; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 221 | /* |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 222 | * While reclaiming in a hierarchy, we cache the last child we |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 223 | * reclaimed from. |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 224 | */ |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 225 | int last_scanned_child; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 226 | /* |
| 227 | * Should the accounting and control be hierarchical, per subtree? |
| 228 | */ |
| 229 | bool use_hierarchy; |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 230 | atomic_t oom_lock; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 231 | atomic_t refcnt; |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 232 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 233 | unsigned int swappiness; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 234 | /* OOM-Killer disable */ |
| 235 | int oom_kill_disable; |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 236 | |
KAMEZAWA Hiroyuki | 22a668d | 2009-06-17 16:27:19 -0700 | [diff] [blame] | 237 | /* set when res.limit == memsw.limit */ |
| 238 | bool memsw_is_minimum; |
| 239 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 240 | /* protect arrays of thresholds */ |
| 241 | struct mutex thresholds_lock; |
| 242 | |
| 243 | /* thresholds for memory usage. RCU-protected */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 244 | struct mem_cgroup_thresholds thresholds; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 245 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 246 | /* thresholds for mem+swap usage. RCU-protected */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 247 | struct mem_cgroup_thresholds memsw_thresholds; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 248 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 249 | /* For oom notifier event fd */ |
| 250 | struct list_head oom_notify; |
| 251 | |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 252 | /* |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 253 | * Should we move charges of a task when a task is moved into this |
| 254 | * mem_cgroup ? And what type of charges should we move ? |
| 255 | */ |
| 256 | unsigned long move_charge_at_immigrate; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 257 | /* |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 258 | * percpu counter. |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 259 | */ |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 260 | struct mem_cgroup_stat_cpu *stat; |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 261 | /* |
| 262 | * used when a cpu is offlined or other synchronizations |
| 263 | * See mem_cgroup_read_stat(). |
| 264 | */ |
| 265 | struct mem_cgroup_stat_cpu nocpu_base; |
| 266 | spinlock_t pcp_counter_lock; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 267 | }; |
| 268 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 269 | /* Stuffs for move charges at task migration. */ |
| 270 | /* |
| 271 | * Types of charges to be moved. "move_charge_at_immitgrate" is treated as a |
| 272 | * left-shifted bitmap of these types. |
| 273 | */ |
| 274 | enum move_type { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 275 | MOVE_CHARGE_TYPE_ANON, /* private anonymous page and swap of it */ |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 276 | MOVE_CHARGE_TYPE_FILE, /* file page(including tmpfs) and swap of it */ |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 277 | NR_MOVE_TYPE, |
| 278 | }; |
| 279 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 280 | /* "mc" and its members are protected by cgroup_mutex */ |
| 281 | static struct move_charge_struct { |
Daisuke Nishimura | b1dd693 | 2010-11-24 12:57:06 -0800 | [diff] [blame] | 282 | spinlock_t lock; /* for from, to */ |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 283 | struct mem_cgroup *from; |
| 284 | struct mem_cgroup *to; |
| 285 | unsigned long precharge; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 286 | unsigned long moved_charge; |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 287 | unsigned long moved_swap; |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 288 | struct task_struct *moving_task; /* a task moving charges */ |
| 289 | wait_queue_head_t waitq; /* a waitq for other context */ |
| 290 | } mc = { |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 291 | .lock = __SPIN_LOCK_UNLOCKED(mc.lock), |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 292 | .waitq = __WAIT_QUEUE_HEAD_INITIALIZER(mc.waitq), |
| 293 | }; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 294 | |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 295 | static bool move_anon(void) |
| 296 | { |
| 297 | return test_bit(MOVE_CHARGE_TYPE_ANON, |
| 298 | &mc.to->move_charge_at_immigrate); |
| 299 | } |
| 300 | |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 301 | static bool move_file(void) |
| 302 | { |
| 303 | return test_bit(MOVE_CHARGE_TYPE_FILE, |
| 304 | &mc.to->move_charge_at_immigrate); |
| 305 | } |
| 306 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 307 | /* |
| 308 | * Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft |
| 309 | * limit reclaim to prevent infinite loops, if they ever occur. |
| 310 | */ |
| 311 | #define MEM_CGROUP_MAX_RECLAIM_LOOPS (100) |
| 312 | #define MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS (2) |
| 313 | |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 314 | enum charge_type { |
| 315 | MEM_CGROUP_CHARGE_TYPE_CACHE = 0, |
| 316 | MEM_CGROUP_CHARGE_TYPE_MAPPED, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 317 | MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */ |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 318 | MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */ |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 319 | MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */ |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 320 | MEM_CGROUP_CHARGE_TYPE_DROP, /* a page was unused swap cache */ |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 321 | NR_CHARGE_TYPE, |
| 322 | }; |
| 323 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 324 | /* for encoding cft->private value on file */ |
| 325 | #define _MEM (0) |
| 326 | #define _MEMSWAP (1) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 327 | #define _OOM_TYPE (2) |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 328 | #define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
| 329 | #define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff) |
| 330 | #define MEMFILE_ATTR(val) ((val) & 0xffff) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 331 | /* Used for OOM nofiier */ |
| 332 | #define OOM_CONTROL (0) |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 333 | |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 334 | /* |
| 335 | * Reclaim flags for mem_cgroup_hierarchical_reclaim |
| 336 | */ |
| 337 | #define MEM_CGROUP_RECLAIM_NOSWAP_BIT 0x0 |
| 338 | #define MEM_CGROUP_RECLAIM_NOSWAP (1 << MEM_CGROUP_RECLAIM_NOSWAP_BIT) |
| 339 | #define MEM_CGROUP_RECLAIM_SHRINK_BIT 0x1 |
| 340 | #define MEM_CGROUP_RECLAIM_SHRINK (1 << MEM_CGROUP_RECLAIM_SHRINK_BIT) |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 341 | #define MEM_CGROUP_RECLAIM_SOFT_BIT 0x2 |
| 342 | #define MEM_CGROUP_RECLAIM_SOFT (1 << MEM_CGROUP_RECLAIM_SOFT_BIT) |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 343 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 344 | static void mem_cgroup_get(struct mem_cgroup *mem); |
| 345 | static void mem_cgroup_put(struct mem_cgroup *mem); |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 346 | static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 347 | static void drain_all_stock_async(void); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 348 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 349 | static struct mem_cgroup_per_zone * |
| 350 | mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid) |
| 351 | { |
| 352 | return &mem->info.nodeinfo[nid]->zoneinfo[zid]; |
| 353 | } |
| 354 | |
Wu Fengguang | d324236 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 355 | struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem) |
| 356 | { |
| 357 | return &mem->css; |
| 358 | } |
| 359 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 360 | static struct mem_cgroup_per_zone * |
Johannes Weiner | 97a6c37 | 2011-03-23 16:42:27 -0700 | [diff] [blame] | 361 | page_cgroup_zoneinfo(struct mem_cgroup *mem, struct page *page) |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 362 | { |
Johannes Weiner | 97a6c37 | 2011-03-23 16:42:27 -0700 | [diff] [blame] | 363 | int nid = page_to_nid(page); |
| 364 | int zid = page_zonenum(page); |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 365 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 366 | return mem_cgroup_zoneinfo(mem, nid, zid); |
| 367 | } |
| 368 | |
| 369 | static struct mem_cgroup_tree_per_zone * |
| 370 | soft_limit_tree_node_zone(int nid, int zid) |
| 371 | { |
| 372 | return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid]; |
| 373 | } |
| 374 | |
| 375 | static struct mem_cgroup_tree_per_zone * |
| 376 | soft_limit_tree_from_page(struct page *page) |
| 377 | { |
| 378 | int nid = page_to_nid(page); |
| 379 | int zid = page_zonenum(page); |
| 380 | |
| 381 | return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid]; |
| 382 | } |
| 383 | |
| 384 | static void |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 385 | __mem_cgroup_insert_exceeded(struct mem_cgroup *mem, |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 386 | struct mem_cgroup_per_zone *mz, |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 387 | struct mem_cgroup_tree_per_zone *mctz, |
| 388 | unsigned long long new_usage_in_excess) |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 389 | { |
| 390 | struct rb_node **p = &mctz->rb_root.rb_node; |
| 391 | struct rb_node *parent = NULL; |
| 392 | struct mem_cgroup_per_zone *mz_node; |
| 393 | |
| 394 | if (mz->on_tree) |
| 395 | return; |
| 396 | |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 397 | mz->usage_in_excess = new_usage_in_excess; |
| 398 | if (!mz->usage_in_excess) |
| 399 | return; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 400 | while (*p) { |
| 401 | parent = *p; |
| 402 | mz_node = rb_entry(parent, struct mem_cgroup_per_zone, |
| 403 | tree_node); |
| 404 | if (mz->usage_in_excess < mz_node->usage_in_excess) |
| 405 | p = &(*p)->rb_left; |
| 406 | /* |
| 407 | * We can't avoid mem cgroups that are over their soft |
| 408 | * limit by the same amount |
| 409 | */ |
| 410 | else if (mz->usage_in_excess >= mz_node->usage_in_excess) |
| 411 | p = &(*p)->rb_right; |
| 412 | } |
| 413 | rb_link_node(&mz->tree_node, parent, p); |
| 414 | rb_insert_color(&mz->tree_node, &mctz->rb_root); |
| 415 | mz->on_tree = true; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 416 | } |
| 417 | |
| 418 | static void |
| 419 | __mem_cgroup_remove_exceeded(struct mem_cgroup *mem, |
| 420 | struct mem_cgroup_per_zone *mz, |
| 421 | struct mem_cgroup_tree_per_zone *mctz) |
| 422 | { |
| 423 | if (!mz->on_tree) |
| 424 | return; |
| 425 | rb_erase(&mz->tree_node, &mctz->rb_root); |
| 426 | mz->on_tree = false; |
| 427 | } |
| 428 | |
| 429 | static void |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 430 | mem_cgroup_remove_exceeded(struct mem_cgroup *mem, |
| 431 | struct mem_cgroup_per_zone *mz, |
| 432 | struct mem_cgroup_tree_per_zone *mctz) |
| 433 | { |
| 434 | spin_lock(&mctz->lock); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 435 | __mem_cgroup_remove_exceeded(mem, mz, mctz); |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 436 | spin_unlock(&mctz->lock); |
| 437 | } |
| 438 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 439 | |
| 440 | static void mem_cgroup_update_tree(struct mem_cgroup *mem, struct page *page) |
| 441 | { |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 442 | unsigned long long excess; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 443 | struct mem_cgroup_per_zone *mz; |
| 444 | struct mem_cgroup_tree_per_zone *mctz; |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 445 | int nid = page_to_nid(page); |
| 446 | int zid = page_zonenum(page); |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 447 | mctz = soft_limit_tree_from_page(page); |
| 448 | |
| 449 | /* |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 450 | * Necessary to update all ancestors when hierarchy is used. |
| 451 | * because their event counter is not touched. |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 452 | */ |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 453 | for (; mem; mem = parent_mem_cgroup(mem)) { |
| 454 | mz = mem_cgroup_zoneinfo(mem, nid, zid); |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 455 | excess = res_counter_soft_limit_excess(&mem->res); |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 456 | /* |
| 457 | * We have to update the tree if mz is on RB-tree or |
| 458 | * mem is over its softlimit. |
| 459 | */ |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 460 | if (excess || mz->on_tree) { |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 461 | spin_lock(&mctz->lock); |
| 462 | /* if on-tree, remove it */ |
| 463 | if (mz->on_tree) |
| 464 | __mem_cgroup_remove_exceeded(mem, mz, mctz); |
| 465 | /* |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 466 | * Insert again. mz->usage_in_excess will be updated. |
| 467 | * If excess is 0, no tree ops. |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 468 | */ |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 469 | __mem_cgroup_insert_exceeded(mem, mz, mctz, excess); |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 470 | spin_unlock(&mctz->lock); |
| 471 | } |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 472 | } |
| 473 | } |
| 474 | |
| 475 | static void mem_cgroup_remove_from_trees(struct mem_cgroup *mem) |
| 476 | { |
| 477 | int node, zone; |
| 478 | struct mem_cgroup_per_zone *mz; |
| 479 | struct mem_cgroup_tree_per_zone *mctz; |
| 480 | |
| 481 | for_each_node_state(node, N_POSSIBLE) { |
| 482 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { |
| 483 | mz = mem_cgroup_zoneinfo(mem, node, zone); |
| 484 | mctz = soft_limit_tree_node_zone(node, zone); |
| 485 | mem_cgroup_remove_exceeded(mem, mz, mctz); |
| 486 | } |
| 487 | } |
| 488 | } |
| 489 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 490 | static struct mem_cgroup_per_zone * |
| 491 | __mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz) |
| 492 | { |
| 493 | struct rb_node *rightmost = NULL; |
KAMEZAWA Hiroyuki | 26251ea | 2009-10-01 15:44:08 -0700 | [diff] [blame] | 494 | struct mem_cgroup_per_zone *mz; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 495 | |
| 496 | retry: |
KAMEZAWA Hiroyuki | 26251ea | 2009-10-01 15:44:08 -0700 | [diff] [blame] | 497 | mz = NULL; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 498 | rightmost = rb_last(&mctz->rb_root); |
| 499 | if (!rightmost) |
| 500 | goto done; /* Nothing to reclaim from */ |
| 501 | |
| 502 | mz = rb_entry(rightmost, struct mem_cgroup_per_zone, tree_node); |
| 503 | /* |
| 504 | * Remove the node now but someone else can add it back, |
| 505 | * we will to add it back at the end of reclaim to its correct |
| 506 | * position in the tree. |
| 507 | */ |
| 508 | __mem_cgroup_remove_exceeded(mz->mem, mz, mctz); |
| 509 | if (!res_counter_soft_limit_excess(&mz->mem->res) || |
| 510 | !css_tryget(&mz->mem->css)) |
| 511 | goto retry; |
| 512 | done: |
| 513 | return mz; |
| 514 | } |
| 515 | |
| 516 | static struct mem_cgroup_per_zone * |
| 517 | mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz) |
| 518 | { |
| 519 | struct mem_cgroup_per_zone *mz; |
| 520 | |
| 521 | spin_lock(&mctz->lock); |
| 522 | mz = __mem_cgroup_largest_soft_limit_node(mctz); |
| 523 | spin_unlock(&mctz->lock); |
| 524 | return mz; |
| 525 | } |
| 526 | |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 527 | /* |
| 528 | * Implementation Note: reading percpu statistics for memcg. |
| 529 | * |
| 530 | * Both of vmstat[] and percpu_counter has threshold and do periodic |
| 531 | * synchronization to implement "quick" read. There are trade-off between |
| 532 | * reading cost and precision of value. Then, we may have a chance to implement |
| 533 | * a periodic synchronizion of counter in memcg's counter. |
| 534 | * |
| 535 | * But this _read() function is used for user interface now. The user accounts |
| 536 | * memory usage by memory cgroup and he _always_ requires exact value because |
| 537 | * he accounts memory. Even if we provide quick-and-fuzzy read, we always |
| 538 | * have to visit all online cpus and make sum. So, for now, unnecessary |
| 539 | * synchronization is not implemented. (just implemented for cpu hotplug) |
| 540 | * |
| 541 | * If there are kernel internal actions which can make use of some not-exact |
| 542 | * value, and reading all cpu value can be performance bottleneck in some |
| 543 | * common workload, threashold and synchonization as vmstat[] should be |
| 544 | * implemented. |
| 545 | */ |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 546 | static s64 mem_cgroup_read_stat(struct mem_cgroup *mem, |
| 547 | enum mem_cgroup_stat_index idx) |
| 548 | { |
| 549 | int cpu; |
| 550 | s64 val = 0; |
| 551 | |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 552 | get_online_cpus(); |
| 553 | for_each_online_cpu(cpu) |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 554 | val += per_cpu(mem->stat->count[idx], cpu); |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 555 | #ifdef CONFIG_HOTPLUG_CPU |
| 556 | spin_lock(&mem->pcp_counter_lock); |
| 557 | val += mem->nocpu_base.count[idx]; |
| 558 | spin_unlock(&mem->pcp_counter_lock); |
| 559 | #endif |
| 560 | put_online_cpus(); |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 561 | return val; |
| 562 | } |
| 563 | |
| 564 | static s64 mem_cgroup_local_usage(struct mem_cgroup *mem) |
| 565 | { |
| 566 | s64 ret; |
| 567 | |
| 568 | ret = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS); |
| 569 | ret += mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE); |
| 570 | return ret; |
| 571 | } |
| 572 | |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 573 | static void mem_cgroup_swap_statistics(struct mem_cgroup *mem, |
| 574 | bool charge) |
| 575 | { |
| 576 | int val = (charge) ? 1 : -1; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 577 | this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_SWAPOUT], val); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 578 | } |
| 579 | |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 580 | static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, |
KAMEZAWA Hiroyuki | e401f17 | 2011-01-20 14:44:23 -0800 | [diff] [blame] | 581 | bool file, int nr_pages) |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 582 | { |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 583 | preempt_disable(); |
| 584 | |
KAMEZAWA Hiroyuki | e401f17 | 2011-01-20 14:44:23 -0800 | [diff] [blame] | 585 | if (file) |
| 586 | __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_CACHE], nr_pages); |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 587 | else |
KAMEZAWA Hiroyuki | e401f17 | 2011-01-20 14:44:23 -0800 | [diff] [blame] | 588 | __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_RSS], nr_pages); |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 589 | |
KAMEZAWA Hiroyuki | e401f17 | 2011-01-20 14:44:23 -0800 | [diff] [blame] | 590 | /* pagein of a big page is an event. So, ignore page size */ |
| 591 | if (nr_pages > 0) |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 592 | __this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGIN_COUNT]); |
KAMEZAWA Hiroyuki | 3751d60 | 2011-02-01 15:52:45 -0800 | [diff] [blame] | 593 | else { |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 594 | __this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGOUT_COUNT]); |
KAMEZAWA Hiroyuki | 3751d60 | 2011-02-01 15:52:45 -0800 | [diff] [blame] | 595 | nr_pages = -nr_pages; /* for event */ |
| 596 | } |
KAMEZAWA Hiroyuki | e401f17 | 2011-01-20 14:44:23 -0800 | [diff] [blame] | 597 | |
| 598 | __this_cpu_add(mem->stat->count[MEM_CGROUP_EVENTS], nr_pages); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 599 | |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 600 | preempt_enable(); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 601 | } |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 602 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 603 | static unsigned long mem_cgroup_get_local_zonestat(struct mem_cgroup *mem, |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 604 | enum lru_list idx) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 605 | { |
| 606 | int nid, zid; |
| 607 | struct mem_cgroup_per_zone *mz; |
| 608 | u64 total = 0; |
| 609 | |
| 610 | for_each_online_node(nid) |
| 611 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { |
| 612 | mz = mem_cgroup_zoneinfo(mem, nid, zid); |
| 613 | total += MEM_CGROUP_ZSTAT(mz, idx); |
| 614 | } |
| 615 | return total; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 616 | } |
| 617 | |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 618 | static bool __memcg_event_check(struct mem_cgroup *mem, int event_mask_shift) |
| 619 | { |
| 620 | s64 val; |
| 621 | |
| 622 | val = this_cpu_read(mem->stat->count[MEM_CGROUP_EVENTS]); |
| 623 | |
| 624 | return !(val & ((1 << event_mask_shift) - 1)); |
| 625 | } |
| 626 | |
| 627 | /* |
| 628 | * Check events in order. |
| 629 | * |
| 630 | */ |
| 631 | static void memcg_check_events(struct mem_cgroup *mem, struct page *page) |
| 632 | { |
| 633 | /* threshold event is triggered in finer grain than soft limit */ |
| 634 | if (unlikely(__memcg_event_check(mem, THRESHOLDS_EVENTS_THRESH))) { |
| 635 | mem_cgroup_threshold(mem); |
| 636 | if (unlikely(__memcg_event_check(mem, SOFTLIMIT_EVENTS_THRESH))) |
| 637 | mem_cgroup_update_tree(mem, page); |
| 638 | } |
| 639 | } |
| 640 | |
Hugh Dickins | d5b69e3 | 2008-03-04 14:29:10 -0800 | [diff] [blame] | 641 | static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 642 | { |
| 643 | return container_of(cgroup_subsys_state(cont, |
| 644 | mem_cgroup_subsys_id), struct mem_cgroup, |
| 645 | css); |
| 646 | } |
| 647 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 648 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 649 | { |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 650 | /* |
| 651 | * mm_update_next_owner() may clear mm->owner to NULL |
| 652 | * if it races with swapoff, page migration, etc. |
| 653 | * So this can be called with p == NULL. |
| 654 | */ |
| 655 | if (unlikely(!p)) |
| 656 | return NULL; |
| 657 | |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 658 | return container_of(task_subsys_state(p, mem_cgroup_subsys_id), |
| 659 | struct mem_cgroup, css); |
| 660 | } |
| 661 | |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 662 | static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) |
| 663 | { |
| 664 | struct mem_cgroup *mem = NULL; |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 665 | |
| 666 | if (!mm) |
| 667 | return NULL; |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 668 | /* |
| 669 | * Because we have no locks, mm->owner's may be being moved to other |
| 670 | * cgroup. We use css_tryget() here even if this looks |
| 671 | * pessimistic (rather than adding locks here). |
| 672 | */ |
| 673 | rcu_read_lock(); |
| 674 | do { |
| 675 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
| 676 | if (unlikely(!mem)) |
| 677 | break; |
| 678 | } while (!css_tryget(&mem->css)); |
| 679 | rcu_read_unlock(); |
| 680 | return mem; |
| 681 | } |
| 682 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 683 | /* The caller has to guarantee "mem" exists before calling this */ |
| 684 | static struct mem_cgroup *mem_cgroup_start_loop(struct mem_cgroup *mem) |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 685 | { |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 686 | struct cgroup_subsys_state *css; |
| 687 | int found; |
| 688 | |
| 689 | if (!mem) /* ROOT cgroup has the smallest ID */ |
| 690 | return root_mem_cgroup; /*css_put/get against root is ignored*/ |
| 691 | if (!mem->use_hierarchy) { |
| 692 | if (css_tryget(&mem->css)) |
| 693 | return mem; |
| 694 | return NULL; |
| 695 | } |
| 696 | rcu_read_lock(); |
| 697 | /* |
| 698 | * searching a memory cgroup which has the smallest ID under given |
| 699 | * ROOT cgroup. (ID >= 1) |
| 700 | */ |
| 701 | css = css_get_next(&mem_cgroup_subsys, 1, &mem->css, &found); |
| 702 | if (css && css_tryget(css)) |
| 703 | mem = container_of(css, struct mem_cgroup, css); |
| 704 | else |
| 705 | mem = NULL; |
| 706 | rcu_read_unlock(); |
| 707 | return mem; |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 708 | } |
| 709 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 710 | static struct mem_cgroup *mem_cgroup_get_next(struct mem_cgroup *iter, |
| 711 | struct mem_cgroup *root, |
| 712 | bool cond) |
| 713 | { |
| 714 | int nextid = css_id(&iter->css) + 1; |
| 715 | int found; |
| 716 | int hierarchy_used; |
| 717 | struct cgroup_subsys_state *css; |
| 718 | |
| 719 | hierarchy_used = iter->use_hierarchy; |
| 720 | |
| 721 | css_put(&iter->css); |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 722 | /* If no ROOT, walk all, ignore hierarchy */ |
| 723 | if (!cond || (root && !hierarchy_used)) |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 724 | return NULL; |
| 725 | |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 726 | if (!root) |
| 727 | root = root_mem_cgroup; |
| 728 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 729 | do { |
| 730 | iter = NULL; |
| 731 | rcu_read_lock(); |
| 732 | |
| 733 | css = css_get_next(&mem_cgroup_subsys, nextid, |
| 734 | &root->css, &found); |
| 735 | if (css && css_tryget(css)) |
| 736 | iter = container_of(css, struct mem_cgroup, css); |
| 737 | rcu_read_unlock(); |
| 738 | /* If css is NULL, no more cgroups will be found */ |
| 739 | nextid = found + 1; |
| 740 | } while (css && !iter); |
| 741 | |
| 742 | return iter; |
| 743 | } |
| 744 | /* |
| 745 | * for_eacn_mem_cgroup_tree() for visiting all cgroup under tree. Please |
| 746 | * be careful that "break" loop is not allowed. We have reference count. |
| 747 | * Instead of that modify "cond" to be false and "continue" to exit the loop. |
| 748 | */ |
| 749 | #define for_each_mem_cgroup_tree_cond(iter, root, cond) \ |
| 750 | for (iter = mem_cgroup_start_loop(root);\ |
| 751 | iter != NULL;\ |
| 752 | iter = mem_cgroup_get_next(iter, root, cond)) |
| 753 | |
| 754 | #define for_each_mem_cgroup_tree(iter, root) \ |
| 755 | for_each_mem_cgroup_tree_cond(iter, root, true) |
| 756 | |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 757 | #define for_each_mem_cgroup_all(iter) \ |
| 758 | for_each_mem_cgroup_tree_cond(iter, NULL, true) |
| 759 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 760 | |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 761 | static inline bool mem_cgroup_is_root(struct mem_cgroup *mem) |
| 762 | { |
| 763 | return (mem == root_mem_cgroup); |
| 764 | } |
| 765 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 766 | /* |
| 767 | * Following LRU functions are allowed to be used without PCG_LOCK. |
| 768 | * Operations are called by routine of global LRU independently from memcg. |
| 769 | * What we have to take care of here is validness of pc->mem_cgroup. |
| 770 | * |
| 771 | * Changes to pc->mem_cgroup happens when |
| 772 | * 1. charge |
| 773 | * 2. moving account |
| 774 | * In typical case, "charge" is done before add-to-lru. Exception is SwapCache. |
| 775 | * It is added to LRU before charge. |
| 776 | * If PCG_USED bit is not set, page_cgroup is not added to this private LRU. |
| 777 | * When moving account, the page is not on LRU. It's isolated. |
| 778 | */ |
| 779 | |
| 780 | void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 781 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 782 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 783 | struct mem_cgroup_per_zone *mz; |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 784 | |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 785 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 786 | return; |
| 787 | pc = lookup_page_cgroup(page); |
| 788 | /* can happen while we handle swapcache. */ |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 789 | if (!TestClearPageCgroupAcctLRU(pc)) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 790 | return; |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 791 | VM_BUG_ON(!pc->mem_cgroup); |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 792 | /* |
| 793 | * We don't check PCG_USED bit. It's cleared when the "page" is finally |
| 794 | * removed from global LRU. |
| 795 | */ |
Johannes Weiner | 97a6c37 | 2011-03-23 16:42:27 -0700 | [diff] [blame] | 796 | mz = page_cgroup_zoneinfo(pc->mem_cgroup, page); |
KAMEZAWA Hiroyuki | ece35ca | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 797 | /* huge page split is done under lru_lock. so, we have no races. */ |
| 798 | MEM_CGROUP_ZSTAT(mz, lru) -= 1 << compound_order(page); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 799 | if (mem_cgroup_is_root(pc->mem_cgroup)) |
| 800 | return; |
| 801 | VM_BUG_ON(list_empty(&pc->lru)); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 802 | list_del_init(&pc->lru); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 803 | } |
| 804 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 805 | void mem_cgroup_del_lru(struct page *page) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 806 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 807 | mem_cgroup_del_lru_list(page, page_lru(page)); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 808 | } |
| 809 | |
Minchan Kim | 3f58a82 | 2011-03-22 16:32:53 -0700 | [diff] [blame] | 810 | /* |
| 811 | * Writeback is about to end against a page which has been marked for immediate |
| 812 | * reclaim. If it still appears to be reclaimable, move it to the tail of the |
| 813 | * inactive list. |
| 814 | */ |
| 815 | void mem_cgroup_rotate_reclaimable_page(struct page *page) |
| 816 | { |
| 817 | struct mem_cgroup_per_zone *mz; |
| 818 | struct page_cgroup *pc; |
| 819 | enum lru_list lru = page_lru(page); |
| 820 | |
| 821 | if (mem_cgroup_disabled()) |
| 822 | return; |
| 823 | |
| 824 | pc = lookup_page_cgroup(page); |
| 825 | /* unused or root page is not rotated. */ |
| 826 | if (!PageCgroupUsed(pc)) |
| 827 | return; |
| 828 | /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */ |
| 829 | smp_rmb(); |
| 830 | if (mem_cgroup_is_root(pc->mem_cgroup)) |
| 831 | return; |
Johannes Weiner | 97a6c37 | 2011-03-23 16:42:27 -0700 | [diff] [blame] | 832 | mz = page_cgroup_zoneinfo(pc->mem_cgroup, page); |
Minchan Kim | 3f58a82 | 2011-03-22 16:32:53 -0700 | [diff] [blame] | 833 | list_move_tail(&pc->lru, &mz->lists[lru]); |
| 834 | } |
| 835 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 836 | void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru) |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 837 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 838 | struct mem_cgroup_per_zone *mz; |
| 839 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 840 | |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 841 | if (mem_cgroup_disabled()) |
Lee Schermerhorn | 894bc31 | 2008-10-18 20:26:39 -0700 | [diff] [blame] | 842 | return; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 843 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 844 | pc = lookup_page_cgroup(page); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 845 | /* unused or root page is not rotated. */ |
Johannes Weiner | 713735b | 2011-01-20 14:44:31 -0800 | [diff] [blame] | 846 | if (!PageCgroupUsed(pc)) |
| 847 | return; |
| 848 | /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */ |
| 849 | smp_rmb(); |
| 850 | if (mem_cgroup_is_root(pc->mem_cgroup)) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 851 | return; |
Johannes Weiner | 97a6c37 | 2011-03-23 16:42:27 -0700 | [diff] [blame] | 852 | mz = page_cgroup_zoneinfo(pc->mem_cgroup, page); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 853 | list_move(&pc->lru, &mz->lists[lru]); |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 854 | } |
| 855 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 856 | void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru) |
| 857 | { |
| 858 | struct page_cgroup *pc; |
| 859 | struct mem_cgroup_per_zone *mz; |
| 860 | |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 861 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 862 | return; |
| 863 | pc = lookup_page_cgroup(page); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 864 | VM_BUG_ON(PageCgroupAcctLRU(pc)); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 865 | if (!PageCgroupUsed(pc)) |
| 866 | return; |
Johannes Weiner | 713735b | 2011-01-20 14:44:31 -0800 | [diff] [blame] | 867 | /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */ |
| 868 | smp_rmb(); |
Johannes Weiner | 97a6c37 | 2011-03-23 16:42:27 -0700 | [diff] [blame] | 869 | mz = page_cgroup_zoneinfo(pc->mem_cgroup, page); |
KAMEZAWA Hiroyuki | ece35ca | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 870 | /* huge page split is done under lru_lock. so, we have no races. */ |
| 871 | MEM_CGROUP_ZSTAT(mz, lru) += 1 << compound_order(page); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 872 | SetPageCgroupAcctLRU(pc); |
| 873 | if (mem_cgroup_is_root(pc->mem_cgroup)) |
| 874 | return; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 875 | list_add(&pc->lru, &mz->lists[lru]); |
| 876 | } |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 877 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 878 | /* |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 879 | * At handling SwapCache, pc->mem_cgroup may be changed while it's linked to |
| 880 | * lru because the page may.be reused after it's fully uncharged (because of |
| 881 | * SwapCache behavior).To handle that, unlink page_cgroup from LRU when charge |
| 882 | * it again. This function is only used to charge SwapCache. It's done under |
| 883 | * lock_page and expected that zone->lru_lock is never held. |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 884 | */ |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 885 | static void mem_cgroup_lru_del_before_commit_swapcache(struct page *page) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 886 | { |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 887 | unsigned long flags; |
| 888 | struct zone *zone = page_zone(page); |
| 889 | struct page_cgroup *pc = lookup_page_cgroup(page); |
| 890 | |
| 891 | spin_lock_irqsave(&zone->lru_lock, flags); |
| 892 | /* |
| 893 | * Forget old LRU when this page_cgroup is *not* used. This Used bit |
| 894 | * is guarded by lock_page() because the page is SwapCache. |
| 895 | */ |
| 896 | if (!PageCgroupUsed(pc)) |
| 897 | mem_cgroup_del_lru_list(page, page_lru(page)); |
| 898 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 899 | } |
| 900 | |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 901 | static void mem_cgroup_lru_add_after_commit_swapcache(struct page *page) |
| 902 | { |
| 903 | unsigned long flags; |
| 904 | struct zone *zone = page_zone(page); |
| 905 | struct page_cgroup *pc = lookup_page_cgroup(page); |
| 906 | |
| 907 | spin_lock_irqsave(&zone->lru_lock, flags); |
| 908 | /* link when the page is linked to LRU but page_cgroup isn't */ |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 909 | if (PageLRU(page) && !PageCgroupAcctLRU(pc)) |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 910 | mem_cgroup_add_lru_list(page, page_lru(page)); |
| 911 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
| 912 | } |
| 913 | |
| 914 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 915 | void mem_cgroup_move_lists(struct page *page, |
| 916 | enum lru_list from, enum lru_list to) |
| 917 | { |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 918 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 919 | return; |
| 920 | mem_cgroup_del_lru_list(page, from); |
| 921 | mem_cgroup_add_lru_list(page, to); |
| 922 | } |
| 923 | |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 924 | int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem) |
| 925 | { |
| 926 | int ret; |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 927 | struct mem_cgroup *curr = NULL; |
KAMEZAWA Hiroyuki | 158e0a2 | 2010-08-10 18:03:00 -0700 | [diff] [blame] | 928 | struct task_struct *p; |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 929 | |
KAMEZAWA Hiroyuki | 158e0a2 | 2010-08-10 18:03:00 -0700 | [diff] [blame] | 930 | p = find_lock_task_mm(task); |
| 931 | if (!p) |
| 932 | return 0; |
| 933 | curr = try_get_mem_cgroup_from_mm(p->mm); |
| 934 | task_unlock(p); |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 935 | if (!curr) |
| 936 | return 0; |
Daisuke Nishimura | d31f56d | 2009-12-15 16:47:12 -0800 | [diff] [blame] | 937 | /* |
| 938 | * We should check use_hierarchy of "mem" not "curr". Because checking |
| 939 | * use_hierarchy of "curr" here make this function true if hierarchy is |
| 940 | * enabled in "curr" and "curr" is a child of "mem" in *cgroup* |
| 941 | * hierarchy(even if use_hierarchy is disabled in "mem"). |
| 942 | */ |
| 943 | if (mem->use_hierarchy) |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 944 | ret = css_is_ancestor(&curr->css, &mem->css); |
| 945 | else |
| 946 | ret = (curr == mem); |
| 947 | css_put(&curr->css); |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 948 | return ret; |
| 949 | } |
| 950 | |
KOSAKI Motohiro | c772be9 | 2009-01-07 18:08:25 -0800 | [diff] [blame] | 951 | static int calc_inactive_ratio(struct mem_cgroup *memcg, unsigned long *present_pages) |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 952 | { |
| 953 | unsigned long active; |
| 954 | unsigned long inactive; |
KOSAKI Motohiro | c772be9 | 2009-01-07 18:08:25 -0800 | [diff] [blame] | 955 | unsigned long gb; |
| 956 | unsigned long inactive_ratio; |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 957 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 958 | inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_ANON); |
| 959 | active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_ANON); |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 960 | |
KOSAKI Motohiro | c772be9 | 2009-01-07 18:08:25 -0800 | [diff] [blame] | 961 | gb = (inactive + active) >> (30 - PAGE_SHIFT); |
| 962 | if (gb) |
| 963 | inactive_ratio = int_sqrt(10 * gb); |
| 964 | else |
| 965 | inactive_ratio = 1; |
| 966 | |
| 967 | if (present_pages) { |
| 968 | present_pages[0] = inactive; |
| 969 | present_pages[1] = active; |
| 970 | } |
| 971 | |
| 972 | return inactive_ratio; |
| 973 | } |
| 974 | |
| 975 | int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) |
| 976 | { |
| 977 | unsigned long active; |
| 978 | unsigned long inactive; |
| 979 | unsigned long present_pages[2]; |
| 980 | unsigned long inactive_ratio; |
| 981 | |
| 982 | inactive_ratio = calc_inactive_ratio(memcg, present_pages); |
| 983 | |
| 984 | inactive = present_pages[0]; |
| 985 | active = present_pages[1]; |
| 986 | |
| 987 | if (inactive * inactive_ratio < active) |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 988 | return 1; |
| 989 | |
| 990 | return 0; |
| 991 | } |
| 992 | |
Rik van Riel | 56e49d2 | 2009-06-16 15:32:28 -0700 | [diff] [blame] | 993 | int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg) |
| 994 | { |
| 995 | unsigned long active; |
| 996 | unsigned long inactive; |
| 997 | |
| 998 | inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_FILE); |
| 999 | active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_FILE); |
| 1000 | |
| 1001 | return (active > inactive); |
| 1002 | } |
| 1003 | |
KOSAKI Motohiro | a3d8e05 | 2009-01-07 18:08:19 -0800 | [diff] [blame] | 1004 | unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, |
| 1005 | struct zone *zone, |
| 1006 | enum lru_list lru) |
| 1007 | { |
KOSAKI Motohiro | 13d7e3a | 2010-08-10 18:03:06 -0700 | [diff] [blame] | 1008 | int nid = zone_to_nid(zone); |
KOSAKI Motohiro | a3d8e05 | 2009-01-07 18:08:19 -0800 | [diff] [blame] | 1009 | int zid = zone_idx(zone); |
| 1010 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid); |
| 1011 | |
| 1012 | return MEM_CGROUP_ZSTAT(mz, lru); |
| 1013 | } |
| 1014 | |
KOSAKI Motohiro | 3e2f41f | 2009-01-07 18:08:20 -0800 | [diff] [blame] | 1015 | struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, |
| 1016 | struct zone *zone) |
| 1017 | { |
KOSAKI Motohiro | 13d7e3a | 2010-08-10 18:03:06 -0700 | [diff] [blame] | 1018 | int nid = zone_to_nid(zone); |
KOSAKI Motohiro | 3e2f41f | 2009-01-07 18:08:20 -0800 | [diff] [blame] | 1019 | int zid = zone_idx(zone); |
| 1020 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid); |
| 1021 | |
| 1022 | return &mz->reclaim_stat; |
| 1023 | } |
| 1024 | |
| 1025 | struct zone_reclaim_stat * |
| 1026 | mem_cgroup_get_reclaim_stat_from_page(struct page *page) |
| 1027 | { |
| 1028 | struct page_cgroup *pc; |
| 1029 | struct mem_cgroup_per_zone *mz; |
| 1030 | |
| 1031 | if (mem_cgroup_disabled()) |
| 1032 | return NULL; |
| 1033 | |
| 1034 | pc = lookup_page_cgroup(page); |
Daisuke Nishimura | bd112db | 2009-01-15 13:51:11 -0800 | [diff] [blame] | 1035 | if (!PageCgroupUsed(pc)) |
| 1036 | return NULL; |
Johannes Weiner | 713735b | 2011-01-20 14:44:31 -0800 | [diff] [blame] | 1037 | /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */ |
| 1038 | smp_rmb(); |
Johannes Weiner | 97a6c37 | 2011-03-23 16:42:27 -0700 | [diff] [blame] | 1039 | mz = page_cgroup_zoneinfo(pc->mem_cgroup, page); |
KOSAKI Motohiro | 3e2f41f | 2009-01-07 18:08:20 -0800 | [diff] [blame] | 1040 | return &mz->reclaim_stat; |
| 1041 | } |
| 1042 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1043 | unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, |
| 1044 | struct list_head *dst, |
| 1045 | unsigned long *scanned, int order, |
| 1046 | int mode, struct zone *z, |
| 1047 | struct mem_cgroup *mem_cont, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1048 | int active, int file) |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1049 | { |
| 1050 | unsigned long nr_taken = 0; |
| 1051 | struct page *page; |
| 1052 | unsigned long scan; |
| 1053 | LIST_HEAD(pc_list); |
| 1054 | struct list_head *src; |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 1055 | struct page_cgroup *pc, *tmp; |
KOSAKI Motohiro | 13d7e3a | 2010-08-10 18:03:06 -0700 | [diff] [blame] | 1056 | int nid = zone_to_nid(z); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1057 | int zid = zone_idx(z); |
| 1058 | struct mem_cgroup_per_zone *mz; |
Johannes Weiner | b7c46d1 | 2009-09-21 17:02:56 -0700 | [diff] [blame] | 1059 | int lru = LRU_FILE * file + active; |
KAMEZAWA Hiroyuki | 2ffebca | 2009-06-17 16:27:21 -0700 | [diff] [blame] | 1060 | int ret; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1061 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 1062 | BUG_ON(!mem_cont); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1063 | mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 1064 | src = &mz->lists[lru]; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1065 | |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 1066 | scan = 0; |
| 1067 | list_for_each_entry_safe_reverse(pc, tmp, src, lru) { |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 1068 | if (scan >= nr_to_scan) |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 1069 | break; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1070 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1071 | if (unlikely(!PageCgroupUsed(pc))) |
| 1072 | continue; |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 1073 | |
Johannes Weiner | 6b3ae58 | 2011-03-23 16:42:30 -0700 | [diff] [blame] | 1074 | page = lookup_cgroup_page(pc); |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 1075 | |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 1076 | if (unlikely(!PageLRU(page))) |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 1077 | continue; |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 1078 | |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 1079 | scan++; |
KAMEZAWA Hiroyuki | 2ffebca | 2009-06-17 16:27:21 -0700 | [diff] [blame] | 1080 | ret = __isolate_lru_page(page, mode, file); |
| 1081 | switch (ret) { |
| 1082 | case 0: |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1083 | list_move(&page->lru, dst); |
KAMEZAWA Hiroyuki | 2ffebca | 2009-06-17 16:27:21 -0700 | [diff] [blame] | 1084 | mem_cgroup_del_lru(page); |
Rik van Riel | 2c888cf | 2011-01-13 15:47:13 -0800 | [diff] [blame] | 1085 | nr_taken += hpage_nr_pages(page); |
KAMEZAWA Hiroyuki | 2ffebca | 2009-06-17 16:27:21 -0700 | [diff] [blame] | 1086 | break; |
| 1087 | case -EBUSY: |
| 1088 | /* we don't affect global LRU but rotate in our LRU */ |
| 1089 | mem_cgroup_rotate_lru_list(page, page_lru(page)); |
| 1090 | break; |
| 1091 | default: |
| 1092 | break; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1093 | } |
| 1094 | } |
| 1095 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1096 | *scanned = scan; |
KOSAKI Motohiro | cc8e970 | 2010-08-09 17:19:57 -0700 | [diff] [blame] | 1097 | |
| 1098 | trace_mm_vmscan_memcg_isolate(0, nr_to_scan, scan, nr_taken, |
| 1099 | 0, 0, 0, mode); |
| 1100 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1101 | return nr_taken; |
| 1102 | } |
| 1103 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1104 | #define mem_cgroup_from_res_counter(counter, member) \ |
| 1105 | container_of(counter, struct mem_cgroup, member) |
| 1106 | |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1107 | /** |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1108 | * mem_cgroup_margin - calculate chargeable space of a memory cgroup |
| 1109 | * @mem: the memory cgroup |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1110 | * |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1111 | * Returns the maximum amount of memory @mem can be charged with, in |
| 1112 | * bytes. |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1113 | */ |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1114 | static unsigned long long mem_cgroup_margin(struct mem_cgroup *mem) |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1115 | { |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1116 | unsigned long long margin; |
| 1117 | |
| 1118 | margin = res_counter_margin(&mem->res); |
| 1119 | if (do_swap_account) |
| 1120 | margin = min(margin, res_counter_margin(&mem->memsw)); |
| 1121 | return margin; |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1122 | } |
| 1123 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 1124 | static unsigned int get_swappiness(struct mem_cgroup *memcg) |
| 1125 | { |
| 1126 | struct cgroup *cgrp = memcg->css.cgroup; |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 1127 | |
| 1128 | /* root ? */ |
| 1129 | if (cgrp->parent == NULL) |
| 1130 | return vm_swappiness; |
| 1131 | |
Johannes Weiner | bf1ff26 | 2011-03-23 16:42:32 -0700 | [diff] [blame^] | 1132 | return memcg->swappiness; |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 1133 | } |
| 1134 | |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1135 | static void mem_cgroup_start_move(struct mem_cgroup *mem) |
| 1136 | { |
| 1137 | int cpu; |
KAMEZAWA Hiroyuki | 1489eba | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1138 | |
| 1139 | get_online_cpus(); |
| 1140 | spin_lock(&mem->pcp_counter_lock); |
| 1141 | for_each_online_cpu(cpu) |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1142 | per_cpu(mem->stat->count[MEM_CGROUP_ON_MOVE], cpu) += 1; |
KAMEZAWA Hiroyuki | 1489eba | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1143 | mem->nocpu_base.count[MEM_CGROUP_ON_MOVE] += 1; |
| 1144 | spin_unlock(&mem->pcp_counter_lock); |
| 1145 | put_online_cpus(); |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1146 | |
| 1147 | synchronize_rcu(); |
| 1148 | } |
| 1149 | |
| 1150 | static void mem_cgroup_end_move(struct mem_cgroup *mem) |
| 1151 | { |
| 1152 | int cpu; |
| 1153 | |
| 1154 | if (!mem) |
| 1155 | return; |
KAMEZAWA Hiroyuki | 1489eba | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1156 | get_online_cpus(); |
| 1157 | spin_lock(&mem->pcp_counter_lock); |
| 1158 | for_each_online_cpu(cpu) |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1159 | per_cpu(mem->stat->count[MEM_CGROUP_ON_MOVE], cpu) -= 1; |
KAMEZAWA Hiroyuki | 1489eba | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1160 | mem->nocpu_base.count[MEM_CGROUP_ON_MOVE] -= 1; |
| 1161 | spin_unlock(&mem->pcp_counter_lock); |
| 1162 | put_online_cpus(); |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1163 | } |
| 1164 | /* |
| 1165 | * 2 routines for checking "mem" is under move_account() or not. |
| 1166 | * |
| 1167 | * mem_cgroup_stealed() - checking a cgroup is mc.from or not. This is used |
| 1168 | * for avoiding race in accounting. If true, |
| 1169 | * pc->mem_cgroup may be overwritten. |
| 1170 | * |
| 1171 | * mem_cgroup_under_move() - checking a cgroup is mc.from or mc.to or |
| 1172 | * under hierarchy of moving cgroups. This is for |
| 1173 | * waiting at hith-memory prressure caused by "move". |
| 1174 | */ |
| 1175 | |
| 1176 | static bool mem_cgroup_stealed(struct mem_cgroup *mem) |
| 1177 | { |
| 1178 | VM_BUG_ON(!rcu_read_lock_held()); |
| 1179 | return this_cpu_read(mem->stat->count[MEM_CGROUP_ON_MOVE]) > 0; |
| 1180 | } |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1181 | |
| 1182 | static bool mem_cgroup_under_move(struct mem_cgroup *mem) |
| 1183 | { |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 1184 | struct mem_cgroup *from; |
| 1185 | struct mem_cgroup *to; |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1186 | bool ret = false; |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 1187 | /* |
| 1188 | * Unlike task_move routines, we access mc.to, mc.from not under |
| 1189 | * mutual exclusion by cgroup_mutex. Here, we take spinlock instead. |
| 1190 | */ |
| 1191 | spin_lock(&mc.lock); |
| 1192 | from = mc.from; |
| 1193 | to = mc.to; |
| 1194 | if (!from) |
| 1195 | goto unlock; |
| 1196 | if (from == mem || to == mem |
| 1197 | || (mem->use_hierarchy && css_is_ancestor(&from->css, &mem->css)) |
| 1198 | || (mem->use_hierarchy && css_is_ancestor(&to->css, &mem->css))) |
| 1199 | ret = true; |
| 1200 | unlock: |
| 1201 | spin_unlock(&mc.lock); |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1202 | return ret; |
| 1203 | } |
| 1204 | |
| 1205 | static bool mem_cgroup_wait_acct_move(struct mem_cgroup *mem) |
| 1206 | { |
| 1207 | if (mc.moving_task && current != mc.moving_task) { |
| 1208 | if (mem_cgroup_under_move(mem)) { |
| 1209 | DEFINE_WAIT(wait); |
| 1210 | prepare_to_wait(&mc.waitq, &wait, TASK_INTERRUPTIBLE); |
| 1211 | /* moving charge context might have finished. */ |
| 1212 | if (mc.moving_task) |
| 1213 | schedule(); |
| 1214 | finish_wait(&mc.waitq, &wait); |
| 1215 | return true; |
| 1216 | } |
| 1217 | } |
| 1218 | return false; |
| 1219 | } |
| 1220 | |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1221 | /** |
Kirill A. Shutemov | 6a6135b | 2010-03-10 15:22:25 -0800 | [diff] [blame] | 1222 | * mem_cgroup_print_oom_info: Called from OOM with tasklist_lock held in read mode. |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1223 | * @memcg: The memory cgroup that went over limit |
| 1224 | * @p: Task that is going to be killed |
| 1225 | * |
| 1226 | * NOTE: @memcg and @p's mem_cgroup can be different when hierarchy is |
| 1227 | * enabled |
| 1228 | */ |
| 1229 | void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) |
| 1230 | { |
| 1231 | struct cgroup *task_cgrp; |
| 1232 | struct cgroup *mem_cgrp; |
| 1233 | /* |
| 1234 | * Need a buffer in BSS, can't rely on allocations. The code relies |
| 1235 | * on the assumption that OOM is serialized for memory controller. |
| 1236 | * If this assumption is broken, revisit this code. |
| 1237 | */ |
| 1238 | static char memcg_name[PATH_MAX]; |
| 1239 | int ret; |
| 1240 | |
Daisuke Nishimura | d31f56d | 2009-12-15 16:47:12 -0800 | [diff] [blame] | 1241 | if (!memcg || !p) |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1242 | return; |
| 1243 | |
| 1244 | |
| 1245 | rcu_read_lock(); |
| 1246 | |
| 1247 | mem_cgrp = memcg->css.cgroup; |
| 1248 | task_cgrp = task_cgroup(p, mem_cgroup_subsys_id); |
| 1249 | |
| 1250 | ret = cgroup_path(task_cgrp, memcg_name, PATH_MAX); |
| 1251 | if (ret < 0) { |
| 1252 | /* |
| 1253 | * Unfortunately, we are unable to convert to a useful name |
| 1254 | * But we'll still print out the usage information |
| 1255 | */ |
| 1256 | rcu_read_unlock(); |
| 1257 | goto done; |
| 1258 | } |
| 1259 | rcu_read_unlock(); |
| 1260 | |
| 1261 | printk(KERN_INFO "Task in %s killed", memcg_name); |
| 1262 | |
| 1263 | rcu_read_lock(); |
| 1264 | ret = cgroup_path(mem_cgrp, memcg_name, PATH_MAX); |
| 1265 | if (ret < 0) { |
| 1266 | rcu_read_unlock(); |
| 1267 | goto done; |
| 1268 | } |
| 1269 | rcu_read_unlock(); |
| 1270 | |
| 1271 | /* |
| 1272 | * Continues from above, so we don't need an KERN_ level |
| 1273 | */ |
| 1274 | printk(KERN_CONT " as a result of limit of %s\n", memcg_name); |
| 1275 | done: |
| 1276 | |
| 1277 | printk(KERN_INFO "memory: usage %llukB, limit %llukB, failcnt %llu\n", |
| 1278 | res_counter_read_u64(&memcg->res, RES_USAGE) >> 10, |
| 1279 | res_counter_read_u64(&memcg->res, RES_LIMIT) >> 10, |
| 1280 | res_counter_read_u64(&memcg->res, RES_FAILCNT)); |
| 1281 | printk(KERN_INFO "memory+swap: usage %llukB, limit %llukB, " |
| 1282 | "failcnt %llu\n", |
| 1283 | res_counter_read_u64(&memcg->memsw, RES_USAGE) >> 10, |
| 1284 | res_counter_read_u64(&memcg->memsw, RES_LIMIT) >> 10, |
| 1285 | res_counter_read_u64(&memcg->memsw, RES_FAILCNT)); |
| 1286 | } |
| 1287 | |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1288 | /* |
| 1289 | * This function returns the number of memcg under hierarchy tree. Returns |
| 1290 | * 1(self count) if no children. |
| 1291 | */ |
| 1292 | static int mem_cgroup_count_children(struct mem_cgroup *mem) |
| 1293 | { |
| 1294 | int num = 0; |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1295 | struct mem_cgroup *iter; |
| 1296 | |
| 1297 | for_each_mem_cgroup_tree(iter, mem) |
| 1298 | num++; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1299 | return num; |
| 1300 | } |
| 1301 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1302 | /* |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1303 | * Return the memory (and swap, if configured) limit for a memcg. |
| 1304 | */ |
| 1305 | u64 mem_cgroup_get_limit(struct mem_cgroup *memcg) |
| 1306 | { |
| 1307 | u64 limit; |
| 1308 | u64 memsw; |
| 1309 | |
Johannes Weiner | f3e8eb7 | 2011-01-13 15:47:39 -0800 | [diff] [blame] | 1310 | limit = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 1311 | limit += total_swap_pages << PAGE_SHIFT; |
| 1312 | |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1313 | memsw = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 1314 | /* |
| 1315 | * If memsw is finite and limits the amount of swap space available |
| 1316 | * to this memcg, return that limit. |
| 1317 | */ |
| 1318 | return min(limit, memsw); |
| 1319 | } |
| 1320 | |
| 1321 | /* |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1322 | * Visit the first child (need not be the first child as per the ordering |
| 1323 | * of the cgroup list, since we track last_scanned_child) of @mem and use |
| 1324 | * that to reclaim free pages from. |
| 1325 | */ |
| 1326 | static struct mem_cgroup * |
| 1327 | mem_cgroup_select_victim(struct mem_cgroup *root_mem) |
| 1328 | { |
| 1329 | struct mem_cgroup *ret = NULL; |
| 1330 | struct cgroup_subsys_state *css; |
| 1331 | int nextid, found; |
| 1332 | |
| 1333 | if (!root_mem->use_hierarchy) { |
| 1334 | css_get(&root_mem->css); |
| 1335 | ret = root_mem; |
| 1336 | } |
| 1337 | |
| 1338 | while (!ret) { |
| 1339 | rcu_read_lock(); |
| 1340 | nextid = root_mem->last_scanned_child + 1; |
| 1341 | css = css_get_next(&mem_cgroup_subsys, nextid, &root_mem->css, |
| 1342 | &found); |
| 1343 | if (css && css_tryget(css)) |
| 1344 | ret = container_of(css, struct mem_cgroup, css); |
| 1345 | |
| 1346 | rcu_read_unlock(); |
| 1347 | /* Updates scanning parameter */ |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1348 | if (!css) { |
| 1349 | /* this means start scan from ID:1 */ |
| 1350 | root_mem->last_scanned_child = 0; |
| 1351 | } else |
| 1352 | root_mem->last_scanned_child = found; |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1353 | } |
| 1354 | |
| 1355 | return ret; |
| 1356 | } |
| 1357 | |
| 1358 | /* |
| 1359 | * Scan the hierarchy if needed to reclaim memory. We remember the last child |
| 1360 | * we reclaimed from, so that we don't end up penalizing one child extensively |
| 1361 | * based on its position in the children list. |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1362 | * |
| 1363 | * root_mem is the original ancestor that we've been reclaim from. |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1364 | * |
| 1365 | * We give up and return to the caller when we visit root_mem twice. |
| 1366 | * (other groups can be removed while we're walking....) |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1367 | * |
| 1368 | * If shrink==true, for avoiding to free too much, this returns immedieately. |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1369 | */ |
| 1370 | static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem, |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1371 | struct zone *zone, |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 1372 | gfp_t gfp_mask, |
| 1373 | unsigned long reclaim_options) |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1374 | { |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1375 | struct mem_cgroup *victim; |
| 1376 | int ret, total = 0; |
| 1377 | int loop = 0; |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 1378 | bool noswap = reclaim_options & MEM_CGROUP_RECLAIM_NOSWAP; |
| 1379 | bool shrink = reclaim_options & MEM_CGROUP_RECLAIM_SHRINK; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1380 | bool check_soft = reclaim_options & MEM_CGROUP_RECLAIM_SOFT; |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1381 | unsigned long excess; |
| 1382 | |
| 1383 | excess = res_counter_soft_limit_excess(&root_mem->res) >> PAGE_SHIFT; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1384 | |
KAMEZAWA Hiroyuki | 22a668d | 2009-06-17 16:27:19 -0700 | [diff] [blame] | 1385 | /* If memsw_is_minimum==1, swap-out is of-no-use. */ |
| 1386 | if (root_mem->memsw_is_minimum) |
| 1387 | noswap = true; |
| 1388 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1389 | while (1) { |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1390 | victim = mem_cgroup_select_victim(root_mem); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1391 | if (victim == root_mem) { |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1392 | loop++; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1393 | if (loop >= 1) |
| 1394 | drain_all_stock_async(); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1395 | if (loop >= 2) { |
| 1396 | /* |
| 1397 | * If we have not been able to reclaim |
| 1398 | * anything, it might because there are |
| 1399 | * no reclaimable pages under this hierarchy |
| 1400 | */ |
| 1401 | if (!check_soft || !total) { |
| 1402 | css_put(&victim->css); |
| 1403 | break; |
| 1404 | } |
| 1405 | /* |
| 1406 | * We want to do more targetted reclaim. |
| 1407 | * excess >> 2 is not to excessive so as to |
| 1408 | * reclaim too much, nor too less that we keep |
| 1409 | * coming back to reclaim from this cgroup |
| 1410 | */ |
| 1411 | if (total >= (excess >> 2) || |
| 1412 | (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) { |
| 1413 | css_put(&victim->css); |
| 1414 | break; |
| 1415 | } |
| 1416 | } |
| 1417 | } |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 1418 | if (!mem_cgroup_local_usage(victim)) { |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1419 | /* this cgroup's local usage == 0 */ |
| 1420 | css_put(&victim->css); |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1421 | continue; |
| 1422 | } |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1423 | /* we use swappiness of local cgroup */ |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1424 | if (check_soft) |
| 1425 | ret = mem_cgroup_shrink_node_zone(victim, gfp_mask, |
KOSAKI Motohiro | 14fec79 | 2010-08-10 18:03:05 -0700 | [diff] [blame] | 1426 | noswap, get_swappiness(victim), zone); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1427 | else |
| 1428 | ret = try_to_free_mem_cgroup_pages(victim, gfp_mask, |
| 1429 | noswap, get_swappiness(victim)); |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1430 | css_put(&victim->css); |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1431 | /* |
| 1432 | * At shrinking usage, we can't check we should stop here or |
| 1433 | * reclaim more. It's depends on callers. last_scanned_child |
| 1434 | * will work enough for keeping fairness under tree. |
| 1435 | */ |
| 1436 | if (shrink) |
| 1437 | return ret; |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1438 | total += ret; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1439 | if (check_soft) { |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1440 | if (!res_counter_soft_limit_excess(&root_mem->res)) |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1441 | return total; |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1442 | } else if (mem_cgroup_margin(root_mem)) |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1443 | return 1 + total; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1444 | } |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1445 | return total; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1446 | } |
| 1447 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1448 | /* |
| 1449 | * Check OOM-Killer is already running under our hierarchy. |
| 1450 | * If someone is running, return false. |
| 1451 | */ |
| 1452 | static bool mem_cgroup_oom_lock(struct mem_cgroup *mem) |
| 1453 | { |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1454 | int x, lock_count = 0; |
| 1455 | struct mem_cgroup *iter; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1456 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1457 | for_each_mem_cgroup_tree(iter, mem) { |
| 1458 | x = atomic_inc_return(&iter->oom_lock); |
| 1459 | lock_count = max(x, lock_count); |
| 1460 | } |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1461 | |
| 1462 | if (lock_count == 1) |
| 1463 | return true; |
| 1464 | return false; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1465 | } |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1466 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1467 | static int mem_cgroup_oom_unlock(struct mem_cgroup *mem) |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1468 | { |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1469 | struct mem_cgroup *iter; |
| 1470 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1471 | /* |
| 1472 | * When a new child is created while the hierarchy is under oom, |
| 1473 | * mem_cgroup_oom_lock() may not be called. We have to use |
| 1474 | * atomic_add_unless() here. |
| 1475 | */ |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1476 | for_each_mem_cgroup_tree(iter, mem) |
| 1477 | atomic_add_unless(&iter->oom_lock, -1, 0); |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1478 | return 0; |
| 1479 | } |
| 1480 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1481 | |
| 1482 | static DEFINE_MUTEX(memcg_oom_mutex); |
| 1483 | static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq); |
| 1484 | |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1485 | struct oom_wait_info { |
| 1486 | struct mem_cgroup *mem; |
| 1487 | wait_queue_t wait; |
| 1488 | }; |
| 1489 | |
| 1490 | static int memcg_oom_wake_function(wait_queue_t *wait, |
| 1491 | unsigned mode, int sync, void *arg) |
| 1492 | { |
| 1493 | struct mem_cgroup *wake_mem = (struct mem_cgroup *)arg; |
| 1494 | struct oom_wait_info *oom_wait_info; |
| 1495 | |
| 1496 | oom_wait_info = container_of(wait, struct oom_wait_info, wait); |
| 1497 | |
| 1498 | if (oom_wait_info->mem == wake_mem) |
| 1499 | goto wakeup; |
| 1500 | /* if no hierarchy, no match */ |
| 1501 | if (!oom_wait_info->mem->use_hierarchy || !wake_mem->use_hierarchy) |
| 1502 | return 0; |
| 1503 | /* |
| 1504 | * Both of oom_wait_info->mem and wake_mem are stable under us. |
| 1505 | * Then we can use css_is_ancestor without taking care of RCU. |
| 1506 | */ |
| 1507 | if (!css_is_ancestor(&oom_wait_info->mem->css, &wake_mem->css) && |
| 1508 | !css_is_ancestor(&wake_mem->css, &oom_wait_info->mem->css)) |
| 1509 | return 0; |
| 1510 | |
| 1511 | wakeup: |
| 1512 | return autoremove_wake_function(wait, mode, sync, arg); |
| 1513 | } |
| 1514 | |
| 1515 | static void memcg_wakeup_oom(struct mem_cgroup *mem) |
| 1516 | { |
| 1517 | /* for filtering, pass "mem" as argument. */ |
| 1518 | __wake_up(&memcg_oom_waitq, TASK_NORMAL, 0, mem); |
| 1519 | } |
| 1520 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1521 | static void memcg_oom_recover(struct mem_cgroup *mem) |
| 1522 | { |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 1523 | if (mem && atomic_read(&mem->oom_lock)) |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1524 | memcg_wakeup_oom(mem); |
| 1525 | } |
| 1526 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1527 | /* |
| 1528 | * try to call OOM killer. returns false if we should exit memory-reclaim loop. |
| 1529 | */ |
| 1530 | bool mem_cgroup_handle_oom(struct mem_cgroup *mem, gfp_t mask) |
| 1531 | { |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1532 | struct oom_wait_info owait; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1533 | bool locked, need_to_kill; |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1534 | |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1535 | owait.mem = mem; |
| 1536 | owait.wait.flags = 0; |
| 1537 | owait.wait.func = memcg_oom_wake_function; |
| 1538 | owait.wait.private = current; |
| 1539 | INIT_LIST_HEAD(&owait.wait.task_list); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1540 | need_to_kill = true; |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1541 | /* At first, try to OOM lock hierarchy under mem.*/ |
| 1542 | mutex_lock(&memcg_oom_mutex); |
| 1543 | locked = mem_cgroup_oom_lock(mem); |
| 1544 | /* |
| 1545 | * Even if signal_pending(), we can't quit charge() loop without |
| 1546 | * accounting. So, UNINTERRUPTIBLE is appropriate. But SIGKILL |
| 1547 | * under OOM is always welcomed, use TASK_KILLABLE here. |
| 1548 | */ |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1549 | prepare_to_wait(&memcg_oom_waitq, &owait.wait, TASK_KILLABLE); |
| 1550 | if (!locked || mem->oom_kill_disable) |
| 1551 | need_to_kill = false; |
| 1552 | if (locked) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1553 | mem_cgroup_oom_notify(mem); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1554 | mutex_unlock(&memcg_oom_mutex); |
| 1555 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1556 | if (need_to_kill) { |
| 1557 | finish_wait(&memcg_oom_waitq, &owait.wait); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1558 | mem_cgroup_out_of_memory(mem, mask); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1559 | } else { |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1560 | schedule(); |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1561 | finish_wait(&memcg_oom_waitq, &owait.wait); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1562 | } |
| 1563 | mutex_lock(&memcg_oom_mutex); |
| 1564 | mem_cgroup_oom_unlock(mem); |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1565 | memcg_wakeup_oom(mem); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1566 | mutex_unlock(&memcg_oom_mutex); |
| 1567 | |
| 1568 | if (test_thread_flag(TIF_MEMDIE) || fatal_signal_pending(current)) |
| 1569 | return false; |
| 1570 | /* Give chance to dying process */ |
| 1571 | schedule_timeout(1); |
| 1572 | return true; |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1573 | } |
| 1574 | |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1575 | /* |
| 1576 | * Currently used to update mapped file statistics, but the routine can be |
| 1577 | * generalized to update other statistics as well. |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1578 | * |
| 1579 | * Notes: Race condition |
| 1580 | * |
| 1581 | * We usually use page_cgroup_lock() for accessing page_cgroup member but |
| 1582 | * it tends to be costly. But considering some conditions, we doesn't need |
| 1583 | * to do so _always_. |
| 1584 | * |
| 1585 | * Considering "charge", lock_page_cgroup() is not required because all |
| 1586 | * file-stat operations happen after a page is attached to radix-tree. There |
| 1587 | * are no race with "charge". |
| 1588 | * |
| 1589 | * Considering "uncharge", we know that memcg doesn't clear pc->mem_cgroup |
| 1590 | * at "uncharge" intentionally. So, we always see valid pc->mem_cgroup even |
| 1591 | * if there are race with "uncharge". Statistics itself is properly handled |
| 1592 | * by flags. |
| 1593 | * |
| 1594 | * Considering "move", this is an only case we see a race. To make the race |
| 1595 | * small, we check MEM_CGROUP_ON_MOVE percpu value and detect there are |
| 1596 | * possibility of race condition. If there is, we take a lock. |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1597 | */ |
KAMEZAWA Hiroyuki | 26174ef | 2010-10-27 15:33:43 -0700 | [diff] [blame] | 1598 | |
Greg Thelen | 2a7106f | 2011-01-13 15:47:37 -0800 | [diff] [blame] | 1599 | void mem_cgroup_update_page_stat(struct page *page, |
| 1600 | enum mem_cgroup_page_stat_item idx, int val) |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1601 | { |
| 1602 | struct mem_cgroup *mem; |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1603 | struct page_cgroup *pc = lookup_page_cgroup(page); |
| 1604 | bool need_unlock = false; |
KAMEZAWA Hiroyuki | dbd4ea7 | 2011-01-13 15:47:38 -0800 | [diff] [blame] | 1605 | unsigned long uninitialized_var(flags); |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1606 | |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1607 | if (unlikely(!pc)) |
| 1608 | return; |
| 1609 | |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1610 | rcu_read_lock(); |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1611 | mem = pc->mem_cgroup; |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1612 | if (unlikely(!mem || !PageCgroupUsed(pc))) |
| 1613 | goto out; |
| 1614 | /* pc->mem_cgroup is unstable ? */ |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 1615 | if (unlikely(mem_cgroup_stealed(mem)) || PageTransHuge(page)) { |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1616 | /* take a lock against to access pc->mem_cgroup */ |
KAMEZAWA Hiroyuki | dbd4ea7 | 2011-01-13 15:47:38 -0800 | [diff] [blame] | 1617 | move_lock_page_cgroup(pc, &flags); |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1618 | need_unlock = true; |
| 1619 | mem = pc->mem_cgroup; |
| 1620 | if (!mem || !PageCgroupUsed(pc)) |
| 1621 | goto out; |
| 1622 | } |
KAMEZAWA Hiroyuki | 26174ef | 2010-10-27 15:33:43 -0700 | [diff] [blame] | 1623 | |
KAMEZAWA Hiroyuki | 26174ef | 2010-10-27 15:33:43 -0700 | [diff] [blame] | 1624 | switch (idx) { |
Greg Thelen | 2a7106f | 2011-01-13 15:47:37 -0800 | [diff] [blame] | 1625 | case MEMCG_NR_FILE_MAPPED: |
KAMEZAWA Hiroyuki | 26174ef | 2010-10-27 15:33:43 -0700 | [diff] [blame] | 1626 | if (val > 0) |
| 1627 | SetPageCgroupFileMapped(pc); |
| 1628 | else if (!page_mapped(page)) |
KAMEZAWA Hiroyuki | 0c270f8 | 2010-10-27 15:33:39 -0700 | [diff] [blame] | 1629 | ClearPageCgroupFileMapped(pc); |
Greg Thelen | 2a7106f | 2011-01-13 15:47:37 -0800 | [diff] [blame] | 1630 | idx = MEM_CGROUP_STAT_FILE_MAPPED; |
KAMEZAWA Hiroyuki | 26174ef | 2010-10-27 15:33:43 -0700 | [diff] [blame] | 1631 | break; |
| 1632 | default: |
| 1633 | BUG(); |
KAMEZAWA Hiroyuki | 8725d54 | 2010-04-06 14:35:05 -0700 | [diff] [blame] | 1634 | } |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1635 | |
Greg Thelen | 2a7106f | 2011-01-13 15:47:37 -0800 | [diff] [blame] | 1636 | this_cpu_add(mem->stat->count[idx], val); |
| 1637 | |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1638 | out: |
| 1639 | if (unlikely(need_unlock)) |
KAMEZAWA Hiroyuki | dbd4ea7 | 2011-01-13 15:47:38 -0800 | [diff] [blame] | 1640 | move_unlock_page_cgroup(pc, &flags); |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1641 | rcu_read_unlock(); |
| 1642 | return; |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1643 | } |
Greg Thelen | 2a7106f | 2011-01-13 15:47:37 -0800 | [diff] [blame] | 1644 | EXPORT_SYMBOL(mem_cgroup_update_page_stat); |
KAMEZAWA Hiroyuki | 26174ef | 2010-10-27 15:33:43 -0700 | [diff] [blame] | 1645 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1646 | /* |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1647 | * size of first charge trial. "32" comes from vmscan.c's magic value. |
| 1648 | * TODO: maybe necessary to use big numbers in big irons. |
| 1649 | */ |
| 1650 | #define CHARGE_SIZE (32 * PAGE_SIZE) |
| 1651 | struct memcg_stock_pcp { |
| 1652 | struct mem_cgroup *cached; /* this never be root cgroup */ |
| 1653 | int charge; |
| 1654 | struct work_struct work; |
| 1655 | }; |
| 1656 | static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock); |
| 1657 | static atomic_t memcg_drain_count; |
| 1658 | |
| 1659 | /* |
| 1660 | * Try to consume stocked charge on this cpu. If success, PAGE_SIZE is consumed |
| 1661 | * from local stock and true is returned. If the stock is 0 or charges from a |
| 1662 | * cgroup which is not current target, returns false. This stock will be |
| 1663 | * refilled. |
| 1664 | */ |
| 1665 | static bool consume_stock(struct mem_cgroup *mem) |
| 1666 | { |
| 1667 | struct memcg_stock_pcp *stock; |
| 1668 | bool ret = true; |
| 1669 | |
| 1670 | stock = &get_cpu_var(memcg_stock); |
| 1671 | if (mem == stock->cached && stock->charge) |
| 1672 | stock->charge -= PAGE_SIZE; |
| 1673 | else /* need to call res_counter_charge */ |
| 1674 | ret = false; |
| 1675 | put_cpu_var(memcg_stock); |
| 1676 | return ret; |
| 1677 | } |
| 1678 | |
| 1679 | /* |
| 1680 | * Returns stocks cached in percpu to res_counter and reset cached information. |
| 1681 | */ |
| 1682 | static void drain_stock(struct memcg_stock_pcp *stock) |
| 1683 | { |
| 1684 | struct mem_cgroup *old = stock->cached; |
| 1685 | |
| 1686 | if (stock->charge) { |
| 1687 | res_counter_uncharge(&old->res, stock->charge); |
| 1688 | if (do_swap_account) |
| 1689 | res_counter_uncharge(&old->memsw, stock->charge); |
| 1690 | } |
| 1691 | stock->cached = NULL; |
| 1692 | stock->charge = 0; |
| 1693 | } |
| 1694 | |
| 1695 | /* |
| 1696 | * This must be called under preempt disabled or must be called by |
| 1697 | * a thread which is pinned to local cpu. |
| 1698 | */ |
| 1699 | static void drain_local_stock(struct work_struct *dummy) |
| 1700 | { |
| 1701 | struct memcg_stock_pcp *stock = &__get_cpu_var(memcg_stock); |
| 1702 | drain_stock(stock); |
| 1703 | } |
| 1704 | |
| 1705 | /* |
| 1706 | * Cache charges(val) which is from res_counter, to local per_cpu area. |
Greg Thelen | 320cc51 | 2010-03-15 15:27:28 +0100 | [diff] [blame] | 1707 | * This will be consumed by consume_stock() function, later. |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1708 | */ |
| 1709 | static void refill_stock(struct mem_cgroup *mem, int val) |
| 1710 | { |
| 1711 | struct memcg_stock_pcp *stock = &get_cpu_var(memcg_stock); |
| 1712 | |
| 1713 | if (stock->cached != mem) { /* reset if necessary */ |
| 1714 | drain_stock(stock); |
| 1715 | stock->cached = mem; |
| 1716 | } |
| 1717 | stock->charge += val; |
| 1718 | put_cpu_var(memcg_stock); |
| 1719 | } |
| 1720 | |
| 1721 | /* |
| 1722 | * Tries to drain stocked charges in other cpus. This function is asynchronous |
| 1723 | * and just put a work per cpu for draining localy on each cpu. Caller can |
| 1724 | * expects some charges will be back to res_counter later but cannot wait for |
| 1725 | * it. |
| 1726 | */ |
| 1727 | static void drain_all_stock_async(void) |
| 1728 | { |
| 1729 | int cpu; |
| 1730 | /* This function is for scheduling "drain" in asynchronous way. |
| 1731 | * The result of "drain" is not directly handled by callers. Then, |
| 1732 | * if someone is calling drain, we don't have to call drain more. |
| 1733 | * Anyway, WORK_STRUCT_PENDING check in queue_work_on() will catch if |
| 1734 | * there is a race. We just do loose check here. |
| 1735 | */ |
| 1736 | if (atomic_read(&memcg_drain_count)) |
| 1737 | return; |
| 1738 | /* Notify other cpus that system-wide "drain" is running */ |
| 1739 | atomic_inc(&memcg_drain_count); |
| 1740 | get_online_cpus(); |
| 1741 | for_each_online_cpu(cpu) { |
| 1742 | struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu); |
| 1743 | schedule_work_on(cpu, &stock->work); |
| 1744 | } |
| 1745 | put_online_cpus(); |
| 1746 | atomic_dec(&memcg_drain_count); |
| 1747 | /* We don't wait for flush_work */ |
| 1748 | } |
| 1749 | |
| 1750 | /* This is a synchronous drain interface. */ |
| 1751 | static void drain_all_stock_sync(void) |
| 1752 | { |
| 1753 | /* called when force_empty is called */ |
| 1754 | atomic_inc(&memcg_drain_count); |
| 1755 | schedule_on_each_cpu(drain_local_stock); |
| 1756 | atomic_dec(&memcg_drain_count); |
| 1757 | } |
| 1758 | |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1759 | /* |
| 1760 | * This function drains percpu counter value from DEAD cpu and |
| 1761 | * move it to local cpu. Note that this function can be preempted. |
| 1762 | */ |
| 1763 | static void mem_cgroup_drain_pcp_counter(struct mem_cgroup *mem, int cpu) |
| 1764 | { |
| 1765 | int i; |
| 1766 | |
| 1767 | spin_lock(&mem->pcp_counter_lock); |
| 1768 | for (i = 0; i < MEM_CGROUP_STAT_DATA; i++) { |
| 1769 | s64 x = per_cpu(mem->stat->count[i], cpu); |
| 1770 | |
| 1771 | per_cpu(mem->stat->count[i], cpu) = 0; |
| 1772 | mem->nocpu_base.count[i] += x; |
| 1773 | } |
KAMEZAWA Hiroyuki | 1489eba | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1774 | /* need to clear ON_MOVE value, works as a kind of lock. */ |
| 1775 | per_cpu(mem->stat->count[MEM_CGROUP_ON_MOVE], cpu) = 0; |
| 1776 | spin_unlock(&mem->pcp_counter_lock); |
| 1777 | } |
| 1778 | |
| 1779 | static void synchronize_mem_cgroup_on_move(struct mem_cgroup *mem, int cpu) |
| 1780 | { |
| 1781 | int idx = MEM_CGROUP_ON_MOVE; |
| 1782 | |
| 1783 | spin_lock(&mem->pcp_counter_lock); |
| 1784 | per_cpu(mem->stat->count[idx], cpu) = mem->nocpu_base.count[idx]; |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1785 | spin_unlock(&mem->pcp_counter_lock); |
| 1786 | } |
| 1787 | |
| 1788 | static int __cpuinit memcg_cpu_hotplug_callback(struct notifier_block *nb, |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1789 | unsigned long action, |
| 1790 | void *hcpu) |
| 1791 | { |
| 1792 | int cpu = (unsigned long)hcpu; |
| 1793 | struct memcg_stock_pcp *stock; |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1794 | struct mem_cgroup *iter; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1795 | |
KAMEZAWA Hiroyuki | 1489eba | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1796 | if ((action == CPU_ONLINE)) { |
| 1797 | for_each_mem_cgroup_all(iter) |
| 1798 | synchronize_mem_cgroup_on_move(iter, cpu); |
| 1799 | return NOTIFY_OK; |
| 1800 | } |
| 1801 | |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1802 | if ((action != CPU_DEAD) || action != CPU_DEAD_FROZEN) |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1803 | return NOTIFY_OK; |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 1804 | |
| 1805 | for_each_mem_cgroup_all(iter) |
| 1806 | mem_cgroup_drain_pcp_counter(iter, cpu); |
| 1807 | |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1808 | stock = &per_cpu(memcg_stock, cpu); |
| 1809 | drain_stock(stock); |
| 1810 | return NOTIFY_OK; |
| 1811 | } |
| 1812 | |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1813 | |
| 1814 | /* See __mem_cgroup_try_charge() for details */ |
| 1815 | enum { |
| 1816 | CHARGE_OK, /* success */ |
| 1817 | CHARGE_RETRY, /* need to retry but retry is not bad */ |
| 1818 | CHARGE_NOMEM, /* we can't do more. return -ENOMEM */ |
| 1819 | CHARGE_WOULDBLOCK, /* GFP_WAIT wasn't set and no enough res. */ |
| 1820 | CHARGE_OOM_DIE, /* the current is killed because of OOM */ |
| 1821 | }; |
| 1822 | |
| 1823 | static int __mem_cgroup_do_charge(struct mem_cgroup *mem, gfp_t gfp_mask, |
| 1824 | int csize, bool oom_check) |
| 1825 | { |
| 1826 | struct mem_cgroup *mem_over_limit; |
| 1827 | struct res_counter *fail_res; |
| 1828 | unsigned long flags = 0; |
| 1829 | int ret; |
| 1830 | |
| 1831 | ret = res_counter_charge(&mem->res, csize, &fail_res); |
| 1832 | |
| 1833 | if (likely(!ret)) { |
| 1834 | if (!do_swap_account) |
| 1835 | return CHARGE_OK; |
| 1836 | ret = res_counter_charge(&mem->memsw, csize, &fail_res); |
| 1837 | if (likely(!ret)) |
| 1838 | return CHARGE_OK; |
| 1839 | |
KAMEZAWA Hiroyuki | 01c88e2 | 2011-01-25 15:07:27 -0800 | [diff] [blame] | 1840 | res_counter_uncharge(&mem->res, csize); |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1841 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, memsw); |
| 1842 | flags |= MEM_CGROUP_RECLAIM_NOSWAP; |
| 1843 | } else |
| 1844 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, res); |
Johannes Weiner | 9221edb | 2011-02-01 15:52:42 -0800 | [diff] [blame] | 1845 | /* |
| 1846 | * csize can be either a huge page (HPAGE_SIZE), a batch of |
| 1847 | * regular pages (CHARGE_SIZE), or a single regular page |
| 1848 | * (PAGE_SIZE). |
| 1849 | * |
| 1850 | * Never reclaim on behalf of optional batching, retry with a |
| 1851 | * single page instead. |
| 1852 | */ |
| 1853 | if (csize == CHARGE_SIZE) |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1854 | return CHARGE_RETRY; |
| 1855 | |
| 1856 | if (!(gfp_mask & __GFP_WAIT)) |
| 1857 | return CHARGE_WOULDBLOCK; |
| 1858 | |
| 1859 | ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, NULL, |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1860 | gfp_mask, flags); |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1861 | if (mem_cgroup_margin(mem_over_limit) >= csize) |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1862 | return CHARGE_RETRY; |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1863 | /* |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1864 | * Even though the limit is exceeded at this point, reclaim |
| 1865 | * may have been able to free some pages. Retry the charge |
| 1866 | * before killing the task. |
| 1867 | * |
| 1868 | * Only for regular pages, though: huge pages are rather |
| 1869 | * unlikely to succeed so close to the limit, and we fall back |
| 1870 | * to regular pages anyway in case of failure. |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1871 | */ |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1872 | if (csize == PAGE_SIZE && ret) |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1873 | return CHARGE_RETRY; |
| 1874 | |
| 1875 | /* |
| 1876 | * At task move, charge accounts can be doubly counted. So, it's |
| 1877 | * better to wait until the end of task_move if something is going on. |
| 1878 | */ |
| 1879 | if (mem_cgroup_wait_acct_move(mem_over_limit)) |
| 1880 | return CHARGE_RETRY; |
| 1881 | |
| 1882 | /* If we don't need to call oom-killer at el, return immediately */ |
| 1883 | if (!oom_check) |
| 1884 | return CHARGE_NOMEM; |
| 1885 | /* check OOM */ |
| 1886 | if (!mem_cgroup_handle_oom(mem_over_limit, gfp_mask)) |
| 1887 | return CHARGE_OOM_DIE; |
| 1888 | |
| 1889 | return CHARGE_RETRY; |
| 1890 | } |
| 1891 | |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1892 | /* |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1893 | * Unlike exported interface, "oom" parameter is added. if oom==true, |
| 1894 | * oom-killer can be invoked. |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1895 | */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1896 | static int __mem_cgroup_try_charge(struct mm_struct *mm, |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 1897 | gfp_t gfp_mask, |
| 1898 | struct mem_cgroup **memcg, bool oom, |
| 1899 | int page_size) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1900 | { |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1901 | int nr_oom_retries = MEM_CGROUP_RECLAIM_RETRIES; |
| 1902 | struct mem_cgroup *mem = NULL; |
| 1903 | int ret; |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 1904 | int csize = max(CHARGE_SIZE, (unsigned long) page_size); |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1905 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1906 | /* |
| 1907 | * Unlike gloval-vm's OOM-kill, we're not in memory shortage |
| 1908 | * in system level. So, allow to go ahead dying process in addition to |
| 1909 | * MEMDIE process. |
| 1910 | */ |
| 1911 | if (unlikely(test_thread_flag(TIF_MEMDIE) |
| 1912 | || fatal_signal_pending(current))) |
| 1913 | goto bypass; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1914 | |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1915 | /* |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 1916 | * We always charge the cgroup the mm_struct belongs to. |
| 1917 | * The mm_struct's mem_cgroup changes on task migration if the |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1918 | * thread group leader migrates. It's possible that mm is not |
| 1919 | * set, if so charge the init_mm (happens for pagecache usage). |
| 1920 | */ |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1921 | if (!*memcg && !mm) |
| 1922 | goto bypass; |
| 1923 | again: |
| 1924 | if (*memcg) { /* css should be a valid one */ |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1925 | mem = *memcg; |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1926 | VM_BUG_ON(css_is_removed(&mem->css)); |
| 1927 | if (mem_cgroup_is_root(mem)) |
| 1928 | goto done; |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 1929 | if (page_size == PAGE_SIZE && consume_stock(mem)) |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1930 | goto done; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1931 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1932 | } else { |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1933 | struct task_struct *p; |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 1934 | |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1935 | rcu_read_lock(); |
| 1936 | p = rcu_dereference(mm->owner); |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1937 | /* |
KAMEZAWA Hiroyuki | ebb76ce | 2010-12-29 14:07:11 -0800 | [diff] [blame] | 1938 | * Because we don't have task_lock(), "p" can exit. |
| 1939 | * In that case, "mem" can point to root or p can be NULL with |
| 1940 | * race with swapoff. Then, we have small risk of mis-accouning. |
| 1941 | * But such kind of mis-account by race always happens because |
| 1942 | * we don't have cgroup_mutex(). It's overkill and we allo that |
| 1943 | * small race, here. |
| 1944 | * (*) swapoff at el will charge against mm-struct not against |
| 1945 | * task-struct. So, mm->owner can be NULL. |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1946 | */ |
| 1947 | mem = mem_cgroup_from_task(p); |
KAMEZAWA Hiroyuki | ebb76ce | 2010-12-29 14:07:11 -0800 | [diff] [blame] | 1948 | if (!mem || mem_cgroup_is_root(mem)) { |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1949 | rcu_read_unlock(); |
| 1950 | goto done; |
| 1951 | } |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 1952 | if (page_size == PAGE_SIZE && consume_stock(mem)) { |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1953 | /* |
| 1954 | * It seems dagerous to access memcg without css_get(). |
| 1955 | * But considering how consume_stok works, it's not |
| 1956 | * necessary. If consume_stock success, some charges |
| 1957 | * from this memcg are cached on this cpu. So, we |
| 1958 | * don't need to call css_get()/css_tryget() before |
| 1959 | * calling consume_stock(). |
| 1960 | */ |
| 1961 | rcu_read_unlock(); |
| 1962 | goto done; |
| 1963 | } |
| 1964 | /* after here, we may be blocked. we need to get refcnt */ |
| 1965 | if (!css_tryget(&mem->css)) { |
| 1966 | rcu_read_unlock(); |
| 1967 | goto again; |
| 1968 | } |
| 1969 | rcu_read_unlock(); |
| 1970 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1971 | |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1972 | do { |
| 1973 | bool oom_check; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1974 | |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1975 | /* If killed, bypass charge */ |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1976 | if (fatal_signal_pending(current)) { |
| 1977 | css_put(&mem->css); |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1978 | goto bypass; |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1979 | } |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1980 | |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1981 | oom_check = false; |
| 1982 | if (oom && !nr_oom_retries) { |
| 1983 | oom_check = true; |
| 1984 | nr_oom_retries = MEM_CGROUP_RECLAIM_RETRIES; |
| 1985 | } |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1986 | |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1987 | ret = __mem_cgroup_do_charge(mem, gfp_mask, csize, oom_check); |
| 1988 | |
| 1989 | switch (ret) { |
| 1990 | case CHARGE_OK: |
| 1991 | break; |
| 1992 | case CHARGE_RETRY: /* not in OOM situation but retry */ |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 1993 | csize = page_size; |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1994 | css_put(&mem->css); |
| 1995 | mem = NULL; |
| 1996 | goto again; |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1997 | case CHARGE_WOULDBLOCK: /* !__GFP_WAIT */ |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 1998 | css_put(&mem->css); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1999 | goto nomem; |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 2000 | case CHARGE_NOMEM: /* OOM routine works */ |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 2001 | if (!oom) { |
| 2002 | css_put(&mem->css); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 2003 | goto nomem; |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 2004 | } |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 2005 | /* If oom, we never return -ENOMEM */ |
| 2006 | nr_oom_retries--; |
| 2007 | break; |
| 2008 | case CHARGE_OOM_DIE: /* Killed by OOM Killer */ |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 2009 | css_put(&mem->css); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 2010 | goto bypass; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 2011 | } |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 2012 | } while (ret != CHARGE_OK); |
| 2013 | |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2014 | if (csize > page_size) |
| 2015 | refill_stock(mem, csize - page_size); |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 2016 | css_put(&mem->css); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2017 | done: |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 2018 | *memcg = mem; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2019 | return 0; |
| 2020 | nomem: |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 2021 | *memcg = NULL; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2022 | return -ENOMEM; |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 2023 | bypass: |
| 2024 | *memcg = NULL; |
| 2025 | return 0; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2026 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2027 | |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2028 | /* |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 2029 | * Somemtimes we have to undo a charge we got by try_charge(). |
| 2030 | * This function is for that and do uncharge, put css's refcnt. |
| 2031 | * gotten by try_charge(). |
| 2032 | */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2033 | static void __mem_cgroup_cancel_charge(struct mem_cgroup *mem, |
| 2034 | unsigned long count) |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 2035 | { |
| 2036 | if (!mem_cgroup_is_root(mem)) { |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2037 | res_counter_uncharge(&mem->res, PAGE_SIZE * count); |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 2038 | if (do_swap_account) |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2039 | res_counter_uncharge(&mem->memsw, PAGE_SIZE * count); |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 2040 | } |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2041 | } |
| 2042 | |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2043 | static void mem_cgroup_cancel_charge(struct mem_cgroup *mem, |
| 2044 | int page_size) |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2045 | { |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2046 | __mem_cgroup_cancel_charge(mem, page_size >> PAGE_SHIFT); |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 2047 | } |
| 2048 | |
| 2049 | /* |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2050 | * A helper function to get mem_cgroup from ID. must be called under |
| 2051 | * rcu_read_lock(). The caller must check css_is_removed() or some if |
| 2052 | * it's concern. (dropping refcnt from swap can be called against removed |
| 2053 | * memcg.) |
| 2054 | */ |
| 2055 | static struct mem_cgroup *mem_cgroup_lookup(unsigned short id) |
| 2056 | { |
| 2057 | struct cgroup_subsys_state *css; |
| 2058 | |
| 2059 | /* ID 0 is unused ID */ |
| 2060 | if (!id) |
| 2061 | return NULL; |
| 2062 | css = css_lookup(&mem_cgroup_subsys, id); |
| 2063 | if (!css) |
| 2064 | return NULL; |
| 2065 | return container_of(css, struct mem_cgroup, css); |
| 2066 | } |
| 2067 | |
Wu Fengguang | e42d9d5 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 2068 | struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2069 | { |
Wu Fengguang | e42d9d5 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 2070 | struct mem_cgroup *mem = NULL; |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 2071 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2072 | unsigned short id; |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2073 | swp_entry_t ent; |
| 2074 | |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 2075 | VM_BUG_ON(!PageLocked(page)); |
| 2076 | |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 2077 | pc = lookup_page_cgroup(page); |
Daisuke Nishimura | c0bd3f6 | 2009-04-30 15:08:11 -0700 | [diff] [blame] | 2078 | lock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2079 | if (PageCgroupUsed(pc)) { |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 2080 | mem = pc->mem_cgroup; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2081 | if (mem && !css_tryget(&mem->css)) |
| 2082 | mem = NULL; |
Wu Fengguang | e42d9d5 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 2083 | } else if (PageSwapCache(page)) { |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 2084 | ent.val = page_private(page); |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2085 | id = lookup_swap_cgroup(ent); |
| 2086 | rcu_read_lock(); |
| 2087 | mem = mem_cgroup_lookup(id); |
| 2088 | if (mem && !css_tryget(&mem->css)) |
| 2089 | mem = NULL; |
| 2090 | rcu_read_unlock(); |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 2091 | } |
Daisuke Nishimura | c0bd3f6 | 2009-04-30 15:08:11 -0700 | [diff] [blame] | 2092 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2093 | return mem; |
| 2094 | } |
| 2095 | |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2096 | static void __mem_cgroup_commit_charge(struct mem_cgroup *mem, |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2097 | struct page *page, |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2098 | struct page_cgroup *pc, |
| 2099 | enum charge_type ctype, |
| 2100 | int page_size) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2101 | { |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2102 | int nr_pages = page_size >> PAGE_SHIFT; |
| 2103 | |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2104 | lock_page_cgroup(pc); |
| 2105 | if (unlikely(PageCgroupUsed(pc))) { |
| 2106 | unlock_page_cgroup(pc); |
| 2107 | mem_cgroup_cancel_charge(mem, page_size); |
| 2108 | return; |
| 2109 | } |
| 2110 | /* |
| 2111 | * we don't need page_cgroup_lock about tail pages, becase they are not |
| 2112 | * accessed by any other context at this point. |
| 2113 | */ |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2114 | pc->mem_cgroup = mem; |
KAMEZAWA Hiroyuki | 261fb61 | 2009-09-23 15:56:33 -0700 | [diff] [blame] | 2115 | /* |
| 2116 | * We access a page_cgroup asynchronously without lock_page_cgroup(). |
| 2117 | * Especially when a page_cgroup is taken from a page, pc->mem_cgroup |
| 2118 | * is accessed after testing USED bit. To make pc->mem_cgroup visible |
| 2119 | * before USED bit, we need memory barrier here. |
| 2120 | * See mem_cgroup_add_lru_list(), etc. |
| 2121 | */ |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2122 | smp_wmb(); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 2123 | switch (ctype) { |
| 2124 | case MEM_CGROUP_CHARGE_TYPE_CACHE: |
| 2125 | case MEM_CGROUP_CHARGE_TYPE_SHMEM: |
| 2126 | SetPageCgroupCache(pc); |
| 2127 | SetPageCgroupUsed(pc); |
| 2128 | break; |
| 2129 | case MEM_CGROUP_CHARGE_TYPE_MAPPED: |
| 2130 | ClearPageCgroupCache(pc); |
| 2131 | SetPageCgroupUsed(pc); |
| 2132 | break; |
| 2133 | default: |
| 2134 | break; |
| 2135 | } |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 2136 | |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2137 | mem_cgroup_charge_statistics(mem, PageCgroupCache(pc), nr_pages); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2138 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 430e4863 | 2010-03-10 15:22:30 -0800 | [diff] [blame] | 2139 | /* |
| 2140 | * "charge_statistics" updated event counter. Then, check it. |
| 2141 | * Insert ancestor (and ancestor's ancestors), to softlimit RB-tree. |
| 2142 | * if they exceeds softlimit. |
| 2143 | */ |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2144 | memcg_check_events(mem, page); |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2145 | } |
| 2146 | |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2147 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 2148 | |
| 2149 | #define PCGF_NOCOPY_AT_SPLIT ((1 << PCG_LOCK) | (1 << PCG_MOVE_LOCK) |\ |
| 2150 | (1 << PCG_ACCT_LRU) | (1 << PCG_MIGRATION)) |
| 2151 | /* |
| 2152 | * Because tail pages are not marked as "used", set it. We're under |
| 2153 | * zone->lru_lock, 'splitting on pmd' and compund_lock. |
| 2154 | */ |
| 2155 | void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail) |
| 2156 | { |
| 2157 | struct page_cgroup *head_pc = lookup_page_cgroup(head); |
| 2158 | struct page_cgroup *tail_pc = lookup_page_cgroup(tail); |
| 2159 | unsigned long flags; |
| 2160 | |
KAMEZAWA Hiroyuki | 3d37c4a | 2011-01-25 15:07:28 -0800 | [diff] [blame] | 2161 | if (mem_cgroup_disabled()) |
| 2162 | return; |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2163 | /* |
KAMEZAWA Hiroyuki | ece35ca | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2164 | * We have no races with charge/uncharge but will have races with |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2165 | * page state accounting. |
| 2166 | */ |
| 2167 | move_lock_page_cgroup(head_pc, &flags); |
| 2168 | |
| 2169 | tail_pc->mem_cgroup = head_pc->mem_cgroup; |
| 2170 | smp_wmb(); /* see __commit_charge() */ |
KAMEZAWA Hiroyuki | ece35ca | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2171 | if (PageCgroupAcctLRU(head_pc)) { |
| 2172 | enum lru_list lru; |
| 2173 | struct mem_cgroup_per_zone *mz; |
| 2174 | |
| 2175 | /* |
| 2176 | * LRU flags cannot be copied because we need to add tail |
| 2177 | *.page to LRU by generic call and our hook will be called. |
| 2178 | * We hold lru_lock, then, reduce counter directly. |
| 2179 | */ |
| 2180 | lru = page_lru(head); |
Johannes Weiner | 97a6c37 | 2011-03-23 16:42:27 -0700 | [diff] [blame] | 2181 | mz = page_cgroup_zoneinfo(head_pc->mem_cgroup, head); |
KAMEZAWA Hiroyuki | ece35ca | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2182 | MEM_CGROUP_ZSTAT(mz, lru) -= 1; |
| 2183 | } |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2184 | tail_pc->flags = head_pc->flags & ~PCGF_NOCOPY_AT_SPLIT; |
| 2185 | move_unlock_page_cgroup(head_pc, &flags); |
| 2186 | } |
| 2187 | #endif |
| 2188 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2189 | /** |
Johannes Weiner | de3638d | 2011-03-23 16:42:28 -0700 | [diff] [blame] | 2190 | * mem_cgroup_move_account - move account of the page |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2191 | * @page: the page |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2192 | * @pc: page_cgroup of the page. |
| 2193 | * @from: mem_cgroup which the page is moved from. |
| 2194 | * @to: mem_cgroup which the page is moved to. @from != @to. |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2195 | * @uncharge: whether we should call uncharge and css_put against @from. |
Johannes Weiner | de3638d | 2011-03-23 16:42:28 -0700 | [diff] [blame] | 2196 | * @charge_size: number of bytes to charge (regular or huge page) |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2197 | * |
| 2198 | * The caller must confirm following. |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2199 | * - page is not on LRU (isolate_page() is useful.) |
Johannes Weiner | de3638d | 2011-03-23 16:42:28 -0700 | [diff] [blame] | 2200 | * - compound_lock is held when charge_size > PAGE_SIZE |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2201 | * |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2202 | * This function doesn't do "charge" nor css_get to new cgroup. It should be |
| 2203 | * done by a caller(__mem_cgroup_try_charge would be usefull). If @uncharge is |
| 2204 | * true, this function does "uncharge" from old cgroup, but it doesn't if |
| 2205 | * @uncharge is false, so a caller should do "uncharge". |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2206 | */ |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2207 | static int mem_cgroup_move_account(struct page *page, struct page_cgroup *pc, |
Johannes Weiner | de3638d | 2011-03-23 16:42:28 -0700 | [diff] [blame] | 2208 | struct mem_cgroup *from, struct mem_cgroup *to, |
| 2209 | bool uncharge, int charge_size) |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2210 | { |
KAMEZAWA Hiroyuki | 987eba6 | 2011-01-20 14:44:25 -0800 | [diff] [blame] | 2211 | int nr_pages = charge_size >> PAGE_SHIFT; |
Johannes Weiner | de3638d | 2011-03-23 16:42:28 -0700 | [diff] [blame] | 2212 | unsigned long flags; |
| 2213 | int ret; |
KAMEZAWA Hiroyuki | 987eba6 | 2011-01-20 14:44:25 -0800 | [diff] [blame] | 2214 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2215 | VM_BUG_ON(from == to); |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2216 | VM_BUG_ON(PageLRU(page)); |
Johannes Weiner | de3638d | 2011-03-23 16:42:28 -0700 | [diff] [blame] | 2217 | /* |
| 2218 | * The page is isolated from LRU. So, collapse function |
| 2219 | * will not handle this page. But page splitting can happen. |
| 2220 | * Do this check under compound_page_lock(). The caller should |
| 2221 | * hold it. |
| 2222 | */ |
| 2223 | ret = -EBUSY; |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2224 | if (charge_size > PAGE_SIZE && !PageTransHuge(page)) |
Johannes Weiner | de3638d | 2011-03-23 16:42:28 -0700 | [diff] [blame] | 2225 | goto out; |
| 2226 | |
| 2227 | lock_page_cgroup(pc); |
| 2228 | |
| 2229 | ret = -EINVAL; |
| 2230 | if (!PageCgroupUsed(pc) || pc->mem_cgroup != from) |
| 2231 | goto unlock; |
| 2232 | |
| 2233 | move_lock_page_cgroup(pc, &flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2234 | |
KAMEZAWA Hiroyuki | 8725d54 | 2010-04-06 14:35:05 -0700 | [diff] [blame] | 2235 | if (PageCgroupFileMapped(pc)) { |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 2236 | /* Update mapped_file data for mem_cgroup */ |
| 2237 | preempt_disable(); |
| 2238 | __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); |
| 2239 | __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); |
| 2240 | preempt_enable(); |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 2241 | } |
KAMEZAWA Hiroyuki | 987eba6 | 2011-01-20 14:44:25 -0800 | [diff] [blame] | 2242 | mem_cgroup_charge_statistics(from, PageCgroupCache(pc), -nr_pages); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2243 | if (uncharge) |
| 2244 | /* This is not "cancel", but cancel_charge does all we need. */ |
KAMEZAWA Hiroyuki | 987eba6 | 2011-01-20 14:44:25 -0800 | [diff] [blame] | 2245 | mem_cgroup_cancel_charge(from, charge_size); |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 2246 | |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2247 | /* caller should have done css_get */ |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2248 | pc->mem_cgroup = to; |
KAMEZAWA Hiroyuki | 987eba6 | 2011-01-20 14:44:25 -0800 | [diff] [blame] | 2249 | mem_cgroup_charge_statistics(to, PageCgroupCache(pc), nr_pages); |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2250 | /* |
| 2251 | * We charges against "to" which may not have any tasks. Then, "to" |
| 2252 | * can be under rmdir(). But in current implementation, caller of |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 2253 | * this function is just force_empty() and move charge, so it's |
| 2254 | * garanteed that "to" is never removed. So, we don't check rmdir |
| 2255 | * status here. |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2256 | */ |
Johannes Weiner | de3638d | 2011-03-23 16:42:28 -0700 | [diff] [blame] | 2257 | move_unlock_page_cgroup(pc, &flags); |
| 2258 | ret = 0; |
| 2259 | unlock: |
Daisuke Nishimura | 57f9fd7 | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 2260 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 2261 | /* |
| 2262 | * check events |
| 2263 | */ |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2264 | memcg_check_events(to, page); |
| 2265 | memcg_check_events(from, page); |
Johannes Weiner | de3638d | 2011-03-23 16:42:28 -0700 | [diff] [blame] | 2266 | out: |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2267 | return ret; |
| 2268 | } |
| 2269 | |
| 2270 | /* |
| 2271 | * move charges to its parent. |
| 2272 | */ |
| 2273 | |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2274 | static int mem_cgroup_move_parent(struct page *page, |
| 2275 | struct page_cgroup *pc, |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2276 | struct mem_cgroup *child, |
| 2277 | gfp_t gfp_mask) |
| 2278 | { |
| 2279 | struct cgroup *cg = child->css.cgroup; |
| 2280 | struct cgroup *pcg = cg->parent; |
| 2281 | struct mem_cgroup *parent; |
KAMEZAWA Hiroyuki | 52dbb90 | 2011-01-25 15:07:29 -0800 | [diff] [blame] | 2282 | int page_size = PAGE_SIZE; |
KAMEZAWA Hiroyuki | 987eba6 | 2011-01-20 14:44:25 -0800 | [diff] [blame] | 2283 | unsigned long flags; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2284 | int ret; |
| 2285 | |
| 2286 | /* Is ROOT ? */ |
| 2287 | if (!pcg) |
| 2288 | return -EINVAL; |
| 2289 | |
Daisuke Nishimura | 57f9fd7 | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 2290 | ret = -EBUSY; |
| 2291 | if (!get_page_unless_zero(page)) |
| 2292 | goto out; |
| 2293 | if (isolate_lru_page(page)) |
| 2294 | goto put; |
KAMEZAWA Hiroyuki | 52dbb90 | 2011-01-25 15:07:29 -0800 | [diff] [blame] | 2295 | |
| 2296 | if (PageTransHuge(page)) |
| 2297 | page_size = HPAGE_SIZE; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2298 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2299 | parent = mem_cgroup_from_cont(pcg); |
KAMEZAWA Hiroyuki | 52dbb90 | 2011-01-25 15:07:29 -0800 | [diff] [blame] | 2300 | ret = __mem_cgroup_try_charge(NULL, gfp_mask, |
| 2301 | &parent, false, page_size); |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 2302 | if (ret || !parent) |
Daisuke Nishimura | 57f9fd7 | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 2303 | goto put_back; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2304 | |
KAMEZAWA Hiroyuki | 52dbb90 | 2011-01-25 15:07:29 -0800 | [diff] [blame] | 2305 | if (page_size > PAGE_SIZE) |
KAMEZAWA Hiroyuki | 987eba6 | 2011-01-20 14:44:25 -0800 | [diff] [blame] | 2306 | flags = compound_lock_irqsave(page); |
| 2307 | |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2308 | ret = mem_cgroup_move_account(page, pc, child, parent, true, page_size); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 2309 | if (ret) |
KAMEZAWA Hiroyuki | 52dbb90 | 2011-01-25 15:07:29 -0800 | [diff] [blame] | 2310 | mem_cgroup_cancel_charge(parent, page_size); |
Jesper Juhl | 8dba474 | 2011-01-25 15:07:24 -0800 | [diff] [blame] | 2311 | |
KAMEZAWA Hiroyuki | 52dbb90 | 2011-01-25 15:07:29 -0800 | [diff] [blame] | 2312 | if (page_size > PAGE_SIZE) |
KAMEZAWA Hiroyuki | 987eba6 | 2011-01-20 14:44:25 -0800 | [diff] [blame] | 2313 | compound_unlock_irqrestore(page, flags); |
Jesper Juhl | 8dba474 | 2011-01-25 15:07:24 -0800 | [diff] [blame] | 2314 | put_back: |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2315 | putback_lru_page(page); |
Daisuke Nishimura | 57f9fd7 | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 2316 | put: |
Daisuke Nishimura | 40d5813 | 2009-01-15 13:51:12 -0800 | [diff] [blame] | 2317 | put_page(page); |
Daisuke Nishimura | 57f9fd7 | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 2318 | out: |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2319 | return ret; |
| 2320 | } |
| 2321 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2322 | /* |
| 2323 | * Charge the memory controller for page usage. |
| 2324 | * Return |
| 2325 | * 0 if the charge was successful |
| 2326 | * < 0 if the cgroup is over its limit |
| 2327 | */ |
| 2328 | static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, |
Daisuke Nishimura | 73045c4 | 2010-08-10 18:02:59 -0700 | [diff] [blame] | 2329 | gfp_t gfp_mask, enum charge_type ctype) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2330 | { |
Daisuke Nishimura | 73045c4 | 2010-08-10 18:02:59 -0700 | [diff] [blame] | 2331 | struct mem_cgroup *mem = NULL; |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2332 | int page_size = PAGE_SIZE; |
Johannes Weiner | 8493ae4 | 2011-02-01 15:52:44 -0800 | [diff] [blame] | 2333 | struct page_cgroup *pc; |
| 2334 | bool oom = true; |
| 2335 | int ret; |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2336 | |
Andrea Arcangeli | 37c2ac7 | 2011-01-13 15:47:16 -0800 | [diff] [blame] | 2337 | if (PageTransHuge(page)) { |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2338 | page_size <<= compound_order(page); |
Andrea Arcangeli | 37c2ac7 | 2011-01-13 15:47:16 -0800 | [diff] [blame] | 2339 | VM_BUG_ON(!PageTransHuge(page)); |
Johannes Weiner | 8493ae4 | 2011-02-01 15:52:44 -0800 | [diff] [blame] | 2340 | /* |
| 2341 | * Never OOM-kill a process for a huge page. The |
| 2342 | * fault handler will fall back to regular pages. |
| 2343 | */ |
| 2344 | oom = false; |
Andrea Arcangeli | 37c2ac7 | 2011-01-13 15:47:16 -0800 | [diff] [blame] | 2345 | } |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2346 | |
| 2347 | pc = lookup_page_cgroup(page); |
Johannes Weiner | af4a662 | 2011-03-23 16:42:24 -0700 | [diff] [blame] | 2348 | BUG_ON(!pc); /* XXX: remove this and move pc lookup into commit */ |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2349 | |
Johannes Weiner | 8493ae4 | 2011-02-01 15:52:44 -0800 | [diff] [blame] | 2350 | ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, oom, page_size); |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 2351 | if (ret || !mem) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2352 | return ret; |
| 2353 | |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2354 | __mem_cgroup_commit_charge(mem, page, pc, ctype, page_size); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2355 | return 0; |
| 2356 | } |
| 2357 | |
| 2358 | int mem_cgroup_newpage_charge(struct page *page, |
| 2359 | struct mm_struct *mm, gfp_t gfp_mask) |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 2360 | { |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2361 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 2362 | return 0; |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2363 | /* |
| 2364 | * If already mapped, we don't have to account. |
| 2365 | * If page cache, page->mapping has address_space. |
| 2366 | * But page->mapping may have out-of-use anon_vma pointer, |
| 2367 | * detecit it by PageAnon() check. newly-mapped-anon's page->mapping |
| 2368 | * is NULL. |
| 2369 | */ |
| 2370 | if (page_mapped(page) || (page->mapping && !PageAnon(page))) |
| 2371 | return 0; |
| 2372 | if (unlikely(!mm)) |
| 2373 | mm = &init_mm; |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 2374 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
Daisuke Nishimura | 73045c4 | 2010-08-10 18:02:59 -0700 | [diff] [blame] | 2375 | MEM_CGROUP_CHARGE_TYPE_MAPPED); |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 2376 | } |
| 2377 | |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2378 | static void |
| 2379 | __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr, |
| 2380 | enum charge_type ctype); |
| 2381 | |
Balbir Singh | e1a1cd5 | 2008-02-07 00:14:02 -0800 | [diff] [blame] | 2382 | int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, |
| 2383 | gfp_t gfp_mask) |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2384 | { |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2385 | int ret; |
| 2386 | |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2387 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 2388 | return 0; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2389 | if (PageCompound(page)) |
| 2390 | return 0; |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2391 | /* |
| 2392 | * Corner case handling. This is called from add_to_page_cache() |
| 2393 | * in usual. But some FS (shmem) precharges this page before calling it |
| 2394 | * and call add_to_page_cache() with GFP_NOWAIT. |
| 2395 | * |
| 2396 | * For GFP_NOWAIT case, the page may be pre-charged before calling |
| 2397 | * add_to_page_cache(). (See shmem.c) check it here and avoid to call |
| 2398 | * charge twice. (It works but has to pay a bit larger cost.) |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2399 | * And when the page is SwapCache, it should take swap information |
| 2400 | * into account. This is under lock_page() now. |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2401 | */ |
| 2402 | if (!(gfp_mask & __GFP_WAIT)) { |
| 2403 | struct page_cgroup *pc; |
| 2404 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2405 | pc = lookup_page_cgroup(page); |
| 2406 | if (!pc) |
| 2407 | return 0; |
| 2408 | lock_page_cgroup(pc); |
| 2409 | if (PageCgroupUsed(pc)) { |
| 2410 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2411 | return 0; |
| 2412 | } |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2413 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2414 | } |
| 2415 | |
Daisuke Nishimura | 73045c4 | 2010-08-10 18:02:59 -0700 | [diff] [blame] | 2416 | if (unlikely(!mm)) |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2417 | mm = &init_mm; |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2418 | |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 2419 | if (page_is_file_cache(page)) |
| 2420 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
Daisuke Nishimura | 73045c4 | 2010-08-10 18:02:59 -0700 | [diff] [blame] | 2421 | MEM_CGROUP_CHARGE_TYPE_CACHE); |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2422 | |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2423 | /* shmem */ |
| 2424 | if (PageSwapCache(page)) { |
KAMEZAWA Hiroyuki | 56039ef | 2011-03-23 16:42:19 -0700 | [diff] [blame] | 2425 | struct mem_cgroup *mem; |
Daisuke Nishimura | 73045c4 | 2010-08-10 18:02:59 -0700 | [diff] [blame] | 2426 | |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2427 | ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem); |
| 2428 | if (!ret) |
| 2429 | __mem_cgroup_commit_charge_swapin(page, mem, |
| 2430 | MEM_CGROUP_CHARGE_TYPE_SHMEM); |
| 2431 | } else |
| 2432 | ret = mem_cgroup_charge_common(page, mm, gfp_mask, |
Daisuke Nishimura | 73045c4 | 2010-08-10 18:02:59 -0700 | [diff] [blame] | 2433 | MEM_CGROUP_CHARGE_TYPE_SHMEM); |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2434 | |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2435 | return ret; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2436 | } |
| 2437 | |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2438 | /* |
| 2439 | * While swap-in, try_charge -> commit or cancel, the page is locked. |
| 2440 | * And when try_charge() successfully returns, one refcnt to memcg without |
Uwe Kleine-König | 21ae295 | 2009-10-07 15:21:09 +0200 | [diff] [blame] | 2441 | * struct page_cgroup is acquired. This refcnt will be consumed by |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2442 | * "commit()" or removed by "cancel()" |
| 2443 | */ |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2444 | int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
| 2445 | struct page *page, |
| 2446 | gfp_t mask, struct mem_cgroup **ptr) |
| 2447 | { |
| 2448 | struct mem_cgroup *mem; |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2449 | int ret; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2450 | |
KAMEZAWA Hiroyuki | 56039ef | 2011-03-23 16:42:19 -0700 | [diff] [blame] | 2451 | *ptr = NULL; |
| 2452 | |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2453 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2454 | return 0; |
| 2455 | |
| 2456 | if (!do_swap_account) |
| 2457 | goto charge_cur_mm; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2458 | /* |
| 2459 | * A racing thread's fault, or swapoff, may have already updated |
Hugh Dickins | 407f9c8 | 2009-12-14 17:59:30 -0800 | [diff] [blame] | 2460 | * the pte, and even removed page from swap cache: in those cases |
| 2461 | * do_swap_page()'s pte_same() test will fail; but there's also a |
| 2462 | * KSM case which does need to charge the page. |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2463 | */ |
| 2464 | if (!PageSwapCache(page)) |
Hugh Dickins | 407f9c8 | 2009-12-14 17:59:30 -0800 | [diff] [blame] | 2465 | goto charge_cur_mm; |
Wu Fengguang | e42d9d5 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 2466 | mem = try_get_mem_cgroup_from_page(page); |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2467 | if (!mem) |
| 2468 | goto charge_cur_mm; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2469 | *ptr = mem; |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2470 | ret = __mem_cgroup_try_charge(NULL, mask, ptr, true, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2471 | css_put(&mem->css); |
| 2472 | return ret; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2473 | charge_cur_mm: |
| 2474 | if (unlikely(!mm)) |
| 2475 | mm = &init_mm; |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2476 | return __mem_cgroup_try_charge(mm, mask, ptr, true, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2477 | } |
| 2478 | |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2479 | static void |
| 2480 | __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr, |
| 2481 | enum charge_type ctype) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2482 | { |
| 2483 | struct page_cgroup *pc; |
| 2484 | |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2485 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2486 | return; |
| 2487 | if (!ptr) |
| 2488 | return; |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2489 | cgroup_exclude_rmdir(&ptr->css); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2490 | pc = lookup_page_cgroup(page); |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 2491 | mem_cgroup_lru_del_before_commit_swapcache(page); |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2492 | __mem_cgroup_commit_charge(ptr, page, pc, ctype, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 2493 | mem_cgroup_lru_add_after_commit_swapcache(page); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2494 | /* |
| 2495 | * Now swap is on-memory. This means this page may be |
| 2496 | * counted both as mem and swap....double count. |
KAMEZAWA Hiroyuki | 03f3c43 | 2009-01-07 18:08:31 -0800 | [diff] [blame] | 2497 | * Fix it by uncharging from memsw. Basically, this SwapCache is stable |
| 2498 | * under lock_page(). But in do_swap_page()::memory.c, reuse_swap_page() |
| 2499 | * may call delete_from_swap_cache() before reach here. |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2500 | */ |
KAMEZAWA Hiroyuki | 03f3c43 | 2009-01-07 18:08:31 -0800 | [diff] [blame] | 2501 | if (do_swap_account && PageSwapCache(page)) { |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2502 | swp_entry_t ent = {.val = page_private(page)}; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2503 | unsigned short id; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2504 | struct mem_cgroup *memcg; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2505 | |
| 2506 | id = swap_cgroup_record(ent, 0); |
| 2507 | rcu_read_lock(); |
| 2508 | memcg = mem_cgroup_lookup(id); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2509 | if (memcg) { |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2510 | /* |
| 2511 | * This recorded memcg can be obsolete one. So, avoid |
| 2512 | * calling css_tryget |
| 2513 | */ |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2514 | if (!mem_cgroup_is_root(memcg)) |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 2515 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2516 | mem_cgroup_swap_statistics(memcg, false); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2517 | mem_cgroup_put(memcg); |
| 2518 | } |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2519 | rcu_read_unlock(); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2520 | } |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2521 | /* |
| 2522 | * At swapin, we may charge account against cgroup which has no tasks. |
| 2523 | * So, rmdir()->pre_destroy() can be called while we do this charge. |
| 2524 | * In that case, we need to call pre_destroy() again. check it here. |
| 2525 | */ |
| 2526 | cgroup_release_and_wakeup_rmdir(&ptr->css); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2527 | } |
| 2528 | |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2529 | void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr) |
| 2530 | { |
| 2531 | __mem_cgroup_commit_charge_swapin(page, ptr, |
| 2532 | MEM_CGROUP_CHARGE_TYPE_MAPPED); |
| 2533 | } |
| 2534 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2535 | void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem) |
| 2536 | { |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2537 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2538 | return; |
| 2539 | if (!mem) |
| 2540 | return; |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2541 | mem_cgroup_cancel_charge(mem, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2542 | } |
| 2543 | |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2544 | static void |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2545 | __do_uncharge(struct mem_cgroup *mem, const enum charge_type ctype, |
| 2546 | int page_size) |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2547 | { |
| 2548 | struct memcg_batch_info *batch = NULL; |
| 2549 | bool uncharge_memsw = true; |
| 2550 | /* If swapout, usage of swap doesn't decrease */ |
| 2551 | if (!do_swap_account || ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) |
| 2552 | uncharge_memsw = false; |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2553 | |
| 2554 | batch = ¤t->memcg_batch; |
| 2555 | /* |
| 2556 | * In usual, we do css_get() when we remember memcg pointer. |
| 2557 | * But in this case, we keep res->usage until end of a series of |
| 2558 | * uncharges. Then, it's ok to ignore memcg's refcnt. |
| 2559 | */ |
| 2560 | if (!batch->memcg) |
| 2561 | batch->memcg = mem; |
| 2562 | /* |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2563 | * do_batch > 0 when unmapping pages or inode invalidate/truncate. |
| 2564 | * In those cases, all pages freed continously can be expected to be in |
| 2565 | * the same cgroup and we have chance to coalesce uncharges. |
| 2566 | * But we do uncharge one by one if this is killed by OOM(TIF_MEMDIE) |
| 2567 | * because we want to do uncharge as soon as possible. |
| 2568 | */ |
| 2569 | |
| 2570 | if (!batch->do_batch || test_thread_flag(TIF_MEMDIE)) |
| 2571 | goto direct_uncharge; |
| 2572 | |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2573 | if (page_size != PAGE_SIZE) |
| 2574 | goto direct_uncharge; |
| 2575 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2576 | /* |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2577 | * In typical case, batch->memcg == mem. This means we can |
| 2578 | * merge a series of uncharges to an uncharge of res_counter. |
| 2579 | * If not, we uncharge res_counter ony by one. |
| 2580 | */ |
| 2581 | if (batch->memcg != mem) |
| 2582 | goto direct_uncharge; |
| 2583 | /* remember freed charge and uncharge it later */ |
| 2584 | batch->bytes += PAGE_SIZE; |
| 2585 | if (uncharge_memsw) |
| 2586 | batch->memsw_bytes += PAGE_SIZE; |
| 2587 | return; |
| 2588 | direct_uncharge: |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2589 | res_counter_uncharge(&mem->res, page_size); |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2590 | if (uncharge_memsw) |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2591 | res_counter_uncharge(&mem->memsw, page_size); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2592 | if (unlikely(batch->memcg != mem)) |
| 2593 | memcg_oom_recover(mem); |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2594 | return; |
| 2595 | } |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2596 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2597 | /* |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2598 | * uncharge if !page_mapped(page) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2599 | */ |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2600 | static struct mem_cgroup * |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2601 | __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2602 | { |
Daisuke Nishimura | 152c9cc | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2603 | int count; |
Hugh Dickins | 8289546 | 2008-03-04 14:29:08 -0800 | [diff] [blame] | 2604 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2605 | struct mem_cgroup *mem = NULL; |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2606 | int page_size = PAGE_SIZE; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2607 | |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2608 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2609 | return NULL; |
Balbir Singh | 4077960 | 2008-04-04 14:29:59 -0700 | [diff] [blame] | 2610 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2611 | if (PageSwapCache(page)) |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2612 | return NULL; |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2613 | |
Andrea Arcangeli | 37c2ac7 | 2011-01-13 15:47:16 -0800 | [diff] [blame] | 2614 | if (PageTransHuge(page)) { |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2615 | page_size <<= compound_order(page); |
Andrea Arcangeli | 37c2ac7 | 2011-01-13 15:47:16 -0800 | [diff] [blame] | 2616 | VM_BUG_ON(!PageTransHuge(page)); |
| 2617 | } |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2618 | |
Daisuke Nishimura | 152c9cc | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2619 | count = page_size >> PAGE_SHIFT; |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2620 | /* |
Balbir Singh | 3c541e1 | 2008-02-07 00:14:41 -0800 | [diff] [blame] | 2621 | * Check if our page_cgroup is valid |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2622 | */ |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2623 | pc = lookup_page_cgroup(page); |
| 2624 | if (unlikely(!pc || !PageCgroupUsed(pc))) |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2625 | return NULL; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2626 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2627 | lock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2628 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2629 | mem = pc->mem_cgroup; |
| 2630 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2631 | if (!PageCgroupUsed(pc)) |
| 2632 | goto unlock_out; |
| 2633 | |
| 2634 | switch (ctype) { |
| 2635 | case MEM_CGROUP_CHARGE_TYPE_MAPPED: |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2636 | case MEM_CGROUP_CHARGE_TYPE_DROP: |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2637 | /* See mem_cgroup_prepare_migration() */ |
| 2638 | if (page_mapped(page) || PageCgroupMigration(pc)) |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2639 | goto unlock_out; |
| 2640 | break; |
| 2641 | case MEM_CGROUP_CHARGE_TYPE_SWAPOUT: |
| 2642 | if (!PageAnon(page)) { /* Shared memory */ |
| 2643 | if (page->mapping && !page_is_file_cache(page)) |
| 2644 | goto unlock_out; |
| 2645 | } else if (page_mapped(page)) /* Anon */ |
| 2646 | goto unlock_out; |
| 2647 | break; |
| 2648 | default: |
| 2649 | break; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2650 | } |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2651 | |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2652 | mem_cgroup_charge_statistics(mem, PageCgroupCache(pc), -count); |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 2653 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2654 | ClearPageCgroupUsed(pc); |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 2655 | /* |
| 2656 | * pc->mem_cgroup is not cleared here. It will be accessed when it's |
| 2657 | * freed from LRU. This is safe because uncharged page is expected not |
| 2658 | * to be reused (freed soon). Exception is SwapCache, it's handled by |
| 2659 | * special functions. |
| 2660 | */ |
Hugh Dickins | b9c565d | 2008-03-04 14:29:11 -0800 | [diff] [blame] | 2661 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2662 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 2663 | /* |
| 2664 | * even after unlock, we have mem->res.usage here and this memcg |
| 2665 | * will never be freed. |
| 2666 | */ |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 2667 | memcg_check_events(mem, page); |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 2668 | if (do_swap_account && ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) { |
| 2669 | mem_cgroup_swap_statistics(mem, true); |
| 2670 | mem_cgroup_get(mem); |
| 2671 | } |
| 2672 | if (!mem_cgroup_is_root(mem)) |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2673 | __do_uncharge(mem, ctype, page_size); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2674 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2675 | return mem; |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2676 | |
| 2677 | unlock_out: |
| 2678 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2679 | return NULL; |
Balbir Singh | 3c541e1 | 2008-02-07 00:14:41 -0800 | [diff] [blame] | 2680 | } |
| 2681 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2682 | void mem_cgroup_uncharge_page(struct page *page) |
| 2683 | { |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2684 | /* early check. */ |
| 2685 | if (page_mapped(page)) |
| 2686 | return; |
| 2687 | if (page->mapping && !PageAnon(page)) |
| 2688 | return; |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2689 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED); |
| 2690 | } |
| 2691 | |
| 2692 | void mem_cgroup_uncharge_cache_page(struct page *page) |
| 2693 | { |
| 2694 | VM_BUG_ON(page_mapped(page)); |
KAMEZAWA Hiroyuki | b7abea9 | 2008-10-18 20:28:09 -0700 | [diff] [blame] | 2695 | VM_BUG_ON(page->mapping); |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2696 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE); |
| 2697 | } |
| 2698 | |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2699 | /* |
| 2700 | * Batch_start/batch_end is called in unmap_page_range/invlidate/trucate. |
| 2701 | * In that cases, pages are freed continuously and we can expect pages |
| 2702 | * are in the same memcg. All these calls itself limits the number of |
| 2703 | * pages freed at once, then uncharge_start/end() is called properly. |
| 2704 | * This may be called prural(2) times in a context, |
| 2705 | */ |
| 2706 | |
| 2707 | void mem_cgroup_uncharge_start(void) |
| 2708 | { |
| 2709 | current->memcg_batch.do_batch++; |
| 2710 | /* We can do nest. */ |
| 2711 | if (current->memcg_batch.do_batch == 1) { |
| 2712 | current->memcg_batch.memcg = NULL; |
| 2713 | current->memcg_batch.bytes = 0; |
| 2714 | current->memcg_batch.memsw_bytes = 0; |
| 2715 | } |
| 2716 | } |
| 2717 | |
| 2718 | void mem_cgroup_uncharge_end(void) |
| 2719 | { |
| 2720 | struct memcg_batch_info *batch = ¤t->memcg_batch; |
| 2721 | |
| 2722 | if (!batch->do_batch) |
| 2723 | return; |
| 2724 | |
| 2725 | batch->do_batch--; |
| 2726 | if (batch->do_batch) /* If stacked, do nothing. */ |
| 2727 | return; |
| 2728 | |
| 2729 | if (!batch->memcg) |
| 2730 | return; |
| 2731 | /* |
| 2732 | * This "batch->memcg" is valid without any css_get/put etc... |
| 2733 | * bacause we hide charges behind us. |
| 2734 | */ |
| 2735 | if (batch->bytes) |
| 2736 | res_counter_uncharge(&batch->memcg->res, batch->bytes); |
| 2737 | if (batch->memsw_bytes) |
| 2738 | res_counter_uncharge(&batch->memcg->memsw, batch->memsw_bytes); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2739 | memcg_oom_recover(batch->memcg); |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2740 | /* forget this pointer (for sanity check) */ |
| 2741 | batch->memcg = NULL; |
| 2742 | } |
| 2743 | |
Daisuke Nishimura | e767e05 | 2009-05-28 14:34:28 -0700 | [diff] [blame] | 2744 | #ifdef CONFIG_SWAP |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2745 | /* |
Daisuke Nishimura | e767e05 | 2009-05-28 14:34:28 -0700 | [diff] [blame] | 2746 | * called after __delete_from_swap_cache() and drop "page" account. |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2747 | * memcg information is recorded to swap_cgroup of "ent" |
| 2748 | */ |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2749 | void |
| 2750 | mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout) |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2751 | { |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2752 | struct mem_cgroup *memcg; |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2753 | int ctype = MEM_CGROUP_CHARGE_TYPE_SWAPOUT; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2754 | |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2755 | if (!swapout) /* this was a swap cache but the swap is unused ! */ |
| 2756 | ctype = MEM_CGROUP_CHARGE_TYPE_DROP; |
| 2757 | |
| 2758 | memcg = __mem_cgroup_uncharge_common(page, ctype); |
| 2759 | |
KAMEZAWA Hiroyuki | f75ca96 | 2010-08-10 18:03:02 -0700 | [diff] [blame] | 2760 | /* |
| 2761 | * record memcg information, if swapout && memcg != NULL, |
| 2762 | * mem_cgroup_get() was called in uncharge(). |
| 2763 | */ |
| 2764 | if (do_swap_account && swapout && memcg) |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2765 | swap_cgroup_record(ent, css_id(&memcg->css)); |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2766 | } |
Daisuke Nishimura | e767e05 | 2009-05-28 14:34:28 -0700 | [diff] [blame] | 2767 | #endif |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2768 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2769 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 2770 | /* |
| 2771 | * called from swap_entry_free(). remove record in swap_cgroup and |
| 2772 | * uncharge "memsw" account. |
| 2773 | */ |
| 2774 | void mem_cgroup_uncharge_swap(swp_entry_t ent) |
| 2775 | { |
| 2776 | struct mem_cgroup *memcg; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2777 | unsigned short id; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2778 | |
| 2779 | if (!do_swap_account) |
| 2780 | return; |
| 2781 | |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2782 | id = swap_cgroup_record(ent, 0); |
| 2783 | rcu_read_lock(); |
| 2784 | memcg = mem_cgroup_lookup(id); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2785 | if (memcg) { |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2786 | /* |
| 2787 | * We uncharge this because swap is freed. |
| 2788 | * This memcg can be obsolete one. We avoid calling css_tryget |
| 2789 | */ |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2790 | if (!mem_cgroup_is_root(memcg)) |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 2791 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2792 | mem_cgroup_swap_statistics(memcg, false); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2793 | mem_cgroup_put(memcg); |
| 2794 | } |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2795 | rcu_read_unlock(); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2796 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2797 | |
| 2798 | /** |
| 2799 | * mem_cgroup_move_swap_account - move swap charge and swap_cgroup's record. |
| 2800 | * @entry: swap entry to be moved |
| 2801 | * @from: mem_cgroup which the entry is moved from |
| 2802 | * @to: mem_cgroup which the entry is moved to |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2803 | * @need_fixup: whether we should fixup res_counters and refcounts. |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2804 | * |
| 2805 | * It succeeds only when the swap_cgroup's record for this entry is the same |
| 2806 | * as the mem_cgroup's id of @from. |
| 2807 | * |
| 2808 | * Returns 0 on success, -EINVAL on failure. |
| 2809 | * |
| 2810 | * The caller must have charged to @to, IOW, called res_counter_charge() about |
| 2811 | * both res and memsw, and called css_get(). |
| 2812 | */ |
| 2813 | static int mem_cgroup_move_swap_account(swp_entry_t entry, |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2814 | struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2815 | { |
| 2816 | unsigned short old_id, new_id; |
| 2817 | |
| 2818 | old_id = css_id(&from->css); |
| 2819 | new_id = css_id(&to->css); |
| 2820 | |
| 2821 | if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2822 | mem_cgroup_swap_statistics(from, false); |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2823 | mem_cgroup_swap_statistics(to, true); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2824 | /* |
| 2825 | * This function is only called from task migration context now. |
| 2826 | * It postpones res_counter and refcount handling till the end |
| 2827 | * of task migration(mem_cgroup_clear_mc()) for performance |
| 2828 | * improvement. But we cannot postpone mem_cgroup_get(to) |
| 2829 | * because if the process that has been moved to @to does |
| 2830 | * swap-in, the refcount of @to might be decreased to 0. |
| 2831 | */ |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2832 | mem_cgroup_get(to); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2833 | if (need_fixup) { |
| 2834 | if (!mem_cgroup_is_root(from)) |
| 2835 | res_counter_uncharge(&from->memsw, PAGE_SIZE); |
| 2836 | mem_cgroup_put(from); |
| 2837 | /* |
| 2838 | * we charged both to->res and to->memsw, so we should |
| 2839 | * uncharge to->res. |
| 2840 | */ |
| 2841 | if (!mem_cgroup_is_root(to)) |
| 2842 | res_counter_uncharge(&to->res, PAGE_SIZE); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2843 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2844 | return 0; |
| 2845 | } |
| 2846 | return -EINVAL; |
| 2847 | } |
| 2848 | #else |
| 2849 | static inline int mem_cgroup_move_swap_account(swp_entry_t entry, |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2850 | struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2851 | { |
| 2852 | return -EINVAL; |
| 2853 | } |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2854 | #endif |
| 2855 | |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 2856 | /* |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2857 | * Before starting migration, account PAGE_SIZE to mem_cgroup that the old |
| 2858 | * page belongs to. |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 2859 | */ |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2860 | int mem_cgroup_prepare_migration(struct page *page, |
Miklos Szeredi | ef6a3c6 | 2011-03-22 16:30:52 -0700 | [diff] [blame] | 2861 | struct page *newpage, struct mem_cgroup **ptr, gfp_t gfp_mask) |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 2862 | { |
| 2863 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2864 | struct mem_cgroup *mem = NULL; |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2865 | enum charge_type ctype; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2866 | int ret = 0; |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 2867 | |
KAMEZAWA Hiroyuki | 56039ef | 2011-03-23 16:42:19 -0700 | [diff] [blame] | 2868 | *ptr = NULL; |
| 2869 | |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 2870 | VM_BUG_ON(PageTransHuge(page)); |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2871 | if (mem_cgroup_disabled()) |
Balbir Singh | 4077960 | 2008-04-04 14:29:59 -0700 | [diff] [blame] | 2872 | return 0; |
| 2873 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2874 | pc = lookup_page_cgroup(page); |
| 2875 | lock_page_cgroup(pc); |
| 2876 | if (PageCgroupUsed(pc)) { |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2877 | mem = pc->mem_cgroup; |
| 2878 | css_get(&mem->css); |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2879 | /* |
| 2880 | * At migrating an anonymous page, its mapcount goes down |
| 2881 | * to 0 and uncharge() will be called. But, even if it's fully |
| 2882 | * unmapped, migration may fail and this page has to be |
| 2883 | * charged again. We set MIGRATION flag here and delay uncharge |
| 2884 | * until end_migration() is called |
| 2885 | * |
| 2886 | * Corner Case Thinking |
| 2887 | * A) |
| 2888 | * When the old page was mapped as Anon and it's unmap-and-freed |
| 2889 | * while migration was ongoing. |
| 2890 | * If unmap finds the old page, uncharge() of it will be delayed |
| 2891 | * until end_migration(). If unmap finds a new page, it's |
| 2892 | * uncharged when it make mapcount to be 1->0. If unmap code |
| 2893 | * finds swap_migration_entry, the new page will not be mapped |
| 2894 | * and end_migration() will find it(mapcount==0). |
| 2895 | * |
| 2896 | * B) |
| 2897 | * When the old page was mapped but migraion fails, the kernel |
| 2898 | * remaps it. A charge for it is kept by MIGRATION flag even |
| 2899 | * if mapcount goes down to 0. We can do remap successfully |
| 2900 | * without charging it again. |
| 2901 | * |
| 2902 | * C) |
| 2903 | * The "old" page is under lock_page() until the end of |
| 2904 | * migration, so, the old page itself will not be swapped-out. |
| 2905 | * If the new page is swapped out before end_migraton, our |
| 2906 | * hook to usual swap-out path will catch the event. |
| 2907 | */ |
| 2908 | if (PageAnon(page)) |
| 2909 | SetPageCgroupMigration(pc); |
Hugh Dickins | b9c565d | 2008-03-04 14:29:11 -0800 | [diff] [blame] | 2910 | } |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2911 | unlock_page_cgroup(pc); |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2912 | /* |
| 2913 | * If the page is not charged at this point, |
| 2914 | * we return here. |
| 2915 | */ |
| 2916 | if (!mem) |
| 2917 | return 0; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2918 | |
Andrea Arcangeli | 93d5c9b | 2010-04-23 13:17:39 -0400 | [diff] [blame] | 2919 | *ptr = mem; |
Miklos Szeredi | ef6a3c6 | 2011-03-22 16:30:52 -0700 | [diff] [blame] | 2920 | ret = __mem_cgroup_try_charge(NULL, gfp_mask, ptr, false, PAGE_SIZE); |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2921 | css_put(&mem->css);/* drop extra refcnt */ |
| 2922 | if (ret || *ptr == NULL) { |
| 2923 | if (PageAnon(page)) { |
| 2924 | lock_page_cgroup(pc); |
| 2925 | ClearPageCgroupMigration(pc); |
| 2926 | unlock_page_cgroup(pc); |
| 2927 | /* |
| 2928 | * The old page may be fully unmapped while we kept it. |
| 2929 | */ |
| 2930 | mem_cgroup_uncharge_page(page); |
| 2931 | } |
| 2932 | return -ENOMEM; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2933 | } |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2934 | /* |
| 2935 | * We charge new page before it's used/mapped. So, even if unlock_page() |
| 2936 | * is called before end_migration, we can catch all events on this new |
| 2937 | * page. In the case new page is migrated but not remapped, new page's |
| 2938 | * mapcount will be finally 0 and we call uncharge in end_migration(). |
| 2939 | */ |
| 2940 | pc = lookup_page_cgroup(newpage); |
| 2941 | if (PageAnon(page)) |
| 2942 | ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED; |
| 2943 | else if (page_is_file_cache(page)) |
| 2944 | ctype = MEM_CGROUP_CHARGE_TYPE_CACHE; |
| 2945 | else |
| 2946 | ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM; |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 2947 | __mem_cgroup_commit_charge(mem, page, pc, ctype, PAGE_SIZE); |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2948 | return ret; |
| 2949 | } |
Hugh Dickins | fb59e9f | 2008-03-04 14:29:16 -0800 | [diff] [blame] | 2950 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2951 | /* remove redundant charge if migration failed*/ |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2952 | void mem_cgroup_end_migration(struct mem_cgroup *mem, |
Daisuke Nishimura | 50de1dd | 2011-01-13 15:47:43 -0800 | [diff] [blame] | 2953 | struct page *oldpage, struct page *newpage, bool migration_ok) |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2954 | { |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2955 | struct page *used, *unused; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2956 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2957 | |
| 2958 | if (!mem) |
| 2959 | return; |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2960 | /* blocks rmdir() */ |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2961 | cgroup_exclude_rmdir(&mem->css); |
Daisuke Nishimura | 50de1dd | 2011-01-13 15:47:43 -0800 | [diff] [blame] | 2962 | if (!migration_ok) { |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2963 | used = oldpage; |
| 2964 | unused = newpage; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2965 | } else { |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2966 | used = newpage; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2967 | unused = oldpage; |
| 2968 | } |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2969 | /* |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2970 | * We disallowed uncharge of pages under migration because mapcount |
| 2971 | * of the page goes down to zero, temporarly. |
| 2972 | * Clear the flag and check the page should be charged. |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2973 | */ |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2974 | pc = lookup_page_cgroup(oldpage); |
| 2975 | lock_page_cgroup(pc); |
| 2976 | ClearPageCgroupMigration(pc); |
| 2977 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2978 | |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2979 | __mem_cgroup_uncharge_common(unused, MEM_CGROUP_CHARGE_TYPE_FORCE); |
| 2980 | |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2981 | /* |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2982 | * If a page is a file cache, radix-tree replacement is very atomic |
| 2983 | * and we can skip this check. When it was an Anon page, its mapcount |
| 2984 | * goes down to 0. But because we added MIGRATION flage, it's not |
| 2985 | * uncharged yet. There are several case but page->mapcount check |
| 2986 | * and USED bit check in mem_cgroup_uncharge_page() will do enough |
| 2987 | * check. (see prepare_charge() also) |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2988 | */ |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2989 | if (PageAnon(used)) |
| 2990 | mem_cgroup_uncharge_page(used); |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2991 | /* |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2992 | * At migration, we may charge account against cgroup which has no |
| 2993 | * tasks. |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2994 | * So, rmdir()->pre_destroy() can be called while we do this charge. |
| 2995 | * In that case, we need to call pre_destroy() again. check it here. |
| 2996 | */ |
| 2997 | cgroup_release_and_wakeup_rmdir(&mem->css); |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 2998 | } |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 2999 | |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3000 | /* |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 3001 | * A call to try to shrink memory usage on charge failure at shmem's swapin. |
| 3002 | * Calling hierarchical_reclaim is not enough because we should update |
| 3003 | * last_oom_jiffies to prevent pagefault_out_of_memory from invoking global OOM. |
| 3004 | * Moreover considering hierarchy, we should reclaim from the mem_over_limit, |
| 3005 | * not from the memcg which this page would be charged to. |
| 3006 | * try_charge_swapin does all of these works properly. |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 3007 | */ |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 3008 | int mem_cgroup_shmem_charge_fallback(struct page *page, |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 3009 | struct mm_struct *mm, |
| 3010 | gfp_t gfp_mask) |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 3011 | { |
KAMEZAWA Hiroyuki | 56039ef | 2011-03-23 16:42:19 -0700 | [diff] [blame] | 3012 | struct mem_cgroup *mem; |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 3013 | int ret; |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 3014 | |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 3015 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 3016 | return 0; |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 3017 | |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 3018 | ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem); |
| 3019 | if (!ret) |
| 3020 | mem_cgroup_cancel_charge_swapin(mem); /* it does !mem check */ |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 3021 | |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 3022 | return ret; |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 3023 | } |
| 3024 | |
Daisuke Nishimura | f212ad7 | 2011-03-23 16:42:25 -0700 | [diff] [blame] | 3025 | #ifdef CONFIG_DEBUG_VM |
| 3026 | static struct page_cgroup *lookup_page_cgroup_used(struct page *page) |
| 3027 | { |
| 3028 | struct page_cgroup *pc; |
| 3029 | |
| 3030 | pc = lookup_page_cgroup(page); |
| 3031 | if (likely(pc) && PageCgroupUsed(pc)) |
| 3032 | return pc; |
| 3033 | return NULL; |
| 3034 | } |
| 3035 | |
| 3036 | bool mem_cgroup_bad_page_check(struct page *page) |
| 3037 | { |
| 3038 | if (mem_cgroup_disabled()) |
| 3039 | return false; |
| 3040 | |
| 3041 | return lookup_page_cgroup_used(page) != NULL; |
| 3042 | } |
| 3043 | |
| 3044 | void mem_cgroup_print_bad_page(struct page *page) |
| 3045 | { |
| 3046 | struct page_cgroup *pc; |
| 3047 | |
| 3048 | pc = lookup_page_cgroup_used(page); |
| 3049 | if (pc) { |
| 3050 | int ret = -1; |
| 3051 | char *path; |
| 3052 | |
| 3053 | printk(KERN_ALERT "pc:%p pc->flags:%lx pc->mem_cgroup:%p", |
| 3054 | pc, pc->flags, pc->mem_cgroup); |
| 3055 | |
| 3056 | path = kmalloc(PATH_MAX, GFP_KERNEL); |
| 3057 | if (path) { |
| 3058 | rcu_read_lock(); |
| 3059 | ret = cgroup_path(pc->mem_cgroup->css.cgroup, |
| 3060 | path, PATH_MAX); |
| 3061 | rcu_read_unlock(); |
| 3062 | } |
| 3063 | |
| 3064 | printk(KERN_CONT "(%s)\n", |
| 3065 | (ret < 0) ? "cannot get the path" : path); |
| 3066 | kfree(path); |
| 3067 | } |
| 3068 | } |
| 3069 | #endif |
| 3070 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3071 | static DEFINE_MUTEX(set_limit_mutex); |
| 3072 | |
KOSAKI Motohiro | d38d2a7 | 2009-01-06 14:39:44 -0800 | [diff] [blame] | 3073 | static int mem_cgroup_resize_limit(struct mem_cgroup *memcg, |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3074 | unsigned long long val) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3075 | { |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 3076 | int retry_count; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3077 | u64 memswlimit, memlimit; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3078 | int ret = 0; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 3079 | int children = mem_cgroup_count_children(memcg); |
| 3080 | u64 curusage, oldusage; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3081 | int enlarge; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 3082 | |
| 3083 | /* |
| 3084 | * For keeping hierarchical_reclaim simple, how long we should retry |
| 3085 | * is depends on callers. We set our retry-count to be function |
| 3086 | * of # of children which we should visit in this loop. |
| 3087 | */ |
| 3088 | retry_count = MEM_CGROUP_RECLAIM_RETRIES * children; |
| 3089 | |
| 3090 | oldusage = res_counter_read_u64(&memcg->res, RES_USAGE); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3091 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3092 | enlarge = 0; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3093 | while (retry_count) { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3094 | if (signal_pending(current)) { |
| 3095 | ret = -EINTR; |
| 3096 | break; |
| 3097 | } |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3098 | /* |
| 3099 | * Rather than hide all in some function, I do this in |
| 3100 | * open coded manner. You see what this really does. |
| 3101 | * We have to guarantee mem->res.limit < mem->memsw.limit. |
| 3102 | */ |
| 3103 | mutex_lock(&set_limit_mutex); |
| 3104 | memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 3105 | if (memswlimit < val) { |
| 3106 | ret = -EINVAL; |
| 3107 | mutex_unlock(&set_limit_mutex); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3108 | break; |
| 3109 | } |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3110 | |
| 3111 | memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 3112 | if (memlimit < val) |
| 3113 | enlarge = 1; |
| 3114 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3115 | ret = res_counter_set_limit(&memcg->res, val); |
KAMEZAWA Hiroyuki | 22a668d | 2009-06-17 16:27:19 -0700 | [diff] [blame] | 3116 | if (!ret) { |
| 3117 | if (memswlimit == val) |
| 3118 | memcg->memsw_is_minimum = true; |
| 3119 | else |
| 3120 | memcg->memsw_is_minimum = false; |
| 3121 | } |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3122 | mutex_unlock(&set_limit_mutex); |
| 3123 | |
| 3124 | if (!ret) |
| 3125 | break; |
| 3126 | |
Bob Liu | aa20d48 | 2009-12-15 16:47:14 -0800 | [diff] [blame] | 3127 | mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL, |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3128 | MEM_CGROUP_RECLAIM_SHRINK); |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 3129 | curusage = res_counter_read_u64(&memcg->res, RES_USAGE); |
| 3130 | /* Usage is reduced ? */ |
| 3131 | if (curusage >= oldusage) |
| 3132 | retry_count--; |
| 3133 | else |
| 3134 | oldusage = curusage; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3135 | } |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3136 | if (!ret && enlarge) |
| 3137 | memcg_oom_recover(memcg); |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 3138 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3139 | return ret; |
| 3140 | } |
| 3141 | |
Li Zefan | 338c843 | 2009-06-17 16:27:15 -0700 | [diff] [blame] | 3142 | static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg, |
| 3143 | unsigned long long val) |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3144 | { |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 3145 | int retry_count; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3146 | u64 memlimit, memswlimit, oldusage, curusage; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 3147 | int children = mem_cgroup_count_children(memcg); |
| 3148 | int ret = -EBUSY; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3149 | int enlarge = 0; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3150 | |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 3151 | /* see mem_cgroup_resize_res_limit */ |
| 3152 | retry_count = children * MEM_CGROUP_RECLAIM_RETRIES; |
| 3153 | oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3154 | while (retry_count) { |
| 3155 | if (signal_pending(current)) { |
| 3156 | ret = -EINTR; |
| 3157 | break; |
| 3158 | } |
| 3159 | /* |
| 3160 | * Rather than hide all in some function, I do this in |
| 3161 | * open coded manner. You see what this really does. |
| 3162 | * We have to guarantee mem->res.limit < mem->memsw.limit. |
| 3163 | */ |
| 3164 | mutex_lock(&set_limit_mutex); |
| 3165 | memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 3166 | if (memlimit > val) { |
| 3167 | ret = -EINVAL; |
| 3168 | mutex_unlock(&set_limit_mutex); |
| 3169 | break; |
| 3170 | } |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3171 | memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 3172 | if (memswlimit < val) |
| 3173 | enlarge = 1; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3174 | ret = res_counter_set_limit(&memcg->memsw, val); |
KAMEZAWA Hiroyuki | 22a668d | 2009-06-17 16:27:19 -0700 | [diff] [blame] | 3175 | if (!ret) { |
| 3176 | if (memlimit == val) |
| 3177 | memcg->memsw_is_minimum = true; |
| 3178 | else |
| 3179 | memcg->memsw_is_minimum = false; |
| 3180 | } |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3181 | mutex_unlock(&set_limit_mutex); |
| 3182 | |
| 3183 | if (!ret) |
| 3184 | break; |
| 3185 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3186 | mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL, |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 3187 | MEM_CGROUP_RECLAIM_NOSWAP | |
| 3188 | MEM_CGROUP_RECLAIM_SHRINK); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3189 | curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 3190 | /* Usage is reduced ? */ |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3191 | if (curusage >= oldusage) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3192 | retry_count--; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 3193 | else |
| 3194 | oldusage = curusage; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3195 | } |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3196 | if (!ret && enlarge) |
| 3197 | memcg_oom_recover(memcg); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3198 | return ret; |
| 3199 | } |
| 3200 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3201 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
KOSAKI Motohiro | 00918b6 | 2010-08-10 18:03:05 -0700 | [diff] [blame] | 3202 | gfp_t gfp_mask) |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3203 | { |
| 3204 | unsigned long nr_reclaimed = 0; |
| 3205 | struct mem_cgroup_per_zone *mz, *next_mz = NULL; |
| 3206 | unsigned long reclaimed; |
| 3207 | int loop = 0; |
| 3208 | struct mem_cgroup_tree_per_zone *mctz; |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 3209 | unsigned long long excess; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3210 | |
| 3211 | if (order > 0) |
| 3212 | return 0; |
| 3213 | |
KOSAKI Motohiro | 00918b6 | 2010-08-10 18:03:05 -0700 | [diff] [blame] | 3214 | mctz = soft_limit_tree_node_zone(zone_to_nid(zone), zone_idx(zone)); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3215 | /* |
| 3216 | * This loop can run a while, specially if mem_cgroup's continuously |
| 3217 | * keep exceeding their soft limit and putting the system under |
| 3218 | * pressure |
| 3219 | */ |
| 3220 | do { |
| 3221 | if (next_mz) |
| 3222 | mz = next_mz; |
| 3223 | else |
| 3224 | mz = mem_cgroup_largest_soft_limit_node(mctz); |
| 3225 | if (!mz) |
| 3226 | break; |
| 3227 | |
| 3228 | reclaimed = mem_cgroup_hierarchical_reclaim(mz->mem, zone, |
| 3229 | gfp_mask, |
| 3230 | MEM_CGROUP_RECLAIM_SOFT); |
| 3231 | nr_reclaimed += reclaimed; |
| 3232 | spin_lock(&mctz->lock); |
| 3233 | |
| 3234 | /* |
| 3235 | * If we failed to reclaim anything from this memory cgroup |
| 3236 | * it is time to move on to the next cgroup |
| 3237 | */ |
| 3238 | next_mz = NULL; |
| 3239 | if (!reclaimed) { |
| 3240 | do { |
| 3241 | /* |
| 3242 | * Loop until we find yet another one. |
| 3243 | * |
| 3244 | * By the time we get the soft_limit lock |
| 3245 | * again, someone might have aded the |
| 3246 | * group back on the RB tree. Iterate to |
| 3247 | * make sure we get a different mem. |
| 3248 | * mem_cgroup_largest_soft_limit_node returns |
| 3249 | * NULL if no other cgroup is present on |
| 3250 | * the tree |
| 3251 | */ |
| 3252 | next_mz = |
| 3253 | __mem_cgroup_largest_soft_limit_node(mctz); |
| 3254 | if (next_mz == mz) { |
| 3255 | css_put(&next_mz->mem->css); |
| 3256 | next_mz = NULL; |
| 3257 | } else /* next_mz == NULL or other memcg */ |
| 3258 | break; |
| 3259 | } while (1); |
| 3260 | } |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3261 | __mem_cgroup_remove_exceeded(mz->mem, mz, mctz); |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 3262 | excess = res_counter_soft_limit_excess(&mz->mem->res); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3263 | /* |
| 3264 | * One school of thought says that we should not add |
| 3265 | * back the node to the tree if reclaim returns 0. |
| 3266 | * But our reclaim could return 0, simply because due |
| 3267 | * to priority we are exposing a smaller subset of |
| 3268 | * memory to reclaim from. Consider this as a longer |
| 3269 | * term TODO. |
| 3270 | */ |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 3271 | /* If excess == 0, no tree ops */ |
| 3272 | __mem_cgroup_insert_exceeded(mz->mem, mz, mctz, excess); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3273 | spin_unlock(&mctz->lock); |
| 3274 | css_put(&mz->mem->css); |
| 3275 | loop++; |
| 3276 | /* |
| 3277 | * Could not reclaim anything and there are no more |
| 3278 | * mem cgroups to try or we seem to be looping without |
| 3279 | * reclaiming anything. |
| 3280 | */ |
| 3281 | if (!nr_reclaimed && |
| 3282 | (next_mz == NULL || |
| 3283 | loop > MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS)) |
| 3284 | break; |
| 3285 | } while (!nr_reclaimed); |
| 3286 | if (next_mz) |
| 3287 | css_put(&next_mz->mem->css); |
| 3288 | return nr_reclaimed; |
| 3289 | } |
| 3290 | |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 3291 | /* |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3292 | * This routine traverse page_cgroup in given list and drop them all. |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3293 | * *And* this routine doesn't reclaim page itself, just removes page_cgroup. |
| 3294 | */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3295 | static int mem_cgroup_force_empty_list(struct mem_cgroup *mem, |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3296 | int node, int zid, enum lru_list lru) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3297 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3298 | struct zone *zone; |
| 3299 | struct mem_cgroup_per_zone *mz; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3300 | struct page_cgroup *pc, *busy; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3301 | unsigned long flags, loop; |
KAMEZAWA Hiroyuki | 072c56c | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 3302 | struct list_head *list; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3303 | int ret = 0; |
KAMEZAWA Hiroyuki | 072c56c | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 3304 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3305 | zone = &NODE_DATA(node)->node_zones[zid]; |
| 3306 | mz = mem_cgroup_zoneinfo(mem, node, zid); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 3307 | list = &mz->lists[lru]; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3308 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3309 | loop = MEM_CGROUP_ZSTAT(mz, lru); |
| 3310 | /* give some margin against EBUSY etc...*/ |
| 3311 | loop += 256; |
| 3312 | busy = NULL; |
| 3313 | while (loop--) { |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 3314 | struct page *page; |
| 3315 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3316 | ret = 0; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3317 | spin_lock_irqsave(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3318 | if (list_empty(list)) { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3319 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 3320 | break; |
| 3321 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3322 | pc = list_entry(list->prev, struct page_cgroup, lru); |
| 3323 | if (busy == pc) { |
| 3324 | list_move(&pc->lru, list); |
Thiago Farina | 648bcc7 | 2010-03-05 13:42:04 -0800 | [diff] [blame] | 3325 | busy = NULL; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3326 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3327 | continue; |
| 3328 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3329 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3330 | |
Johannes Weiner | 6b3ae58 | 2011-03-23 16:42:30 -0700 | [diff] [blame] | 3331 | page = lookup_cgroup_page(pc); |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 3332 | |
| 3333 | ret = mem_cgroup_move_parent(page, pc, mem, GFP_KERNEL); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3334 | if (ret == -ENOMEM) |
| 3335 | break; |
| 3336 | |
| 3337 | if (ret == -EBUSY || ret == -EINVAL) { |
| 3338 | /* found lock contention or "pc" is obsolete. */ |
| 3339 | busy = pc; |
| 3340 | cond_resched(); |
| 3341 | } else |
| 3342 | busy = NULL; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3343 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3344 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3345 | if (!ret && !list_empty(list)) |
| 3346 | return -EBUSY; |
| 3347 | return ret; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3348 | } |
| 3349 | |
| 3350 | /* |
| 3351 | * make mem_cgroup's charge to be 0 if there is no task. |
| 3352 | * This enables deleting this mem_cgroup. |
| 3353 | */ |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3354 | static int mem_cgroup_force_empty(struct mem_cgroup *mem, bool free_all) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3355 | { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3356 | int ret; |
| 3357 | int node, zid, shrink; |
| 3358 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3359 | struct cgroup *cgrp = mem->css.cgroup; |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 3360 | |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3361 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3362 | |
| 3363 | shrink = 0; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3364 | /* should free all ? */ |
| 3365 | if (free_all) |
| 3366 | goto try_to_free; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3367 | move_account: |
Daisuke Nishimura | fce6647 | 2010-01-15 17:01:30 -0800 | [diff] [blame] | 3368 | do { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3369 | ret = -EBUSY; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3370 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children)) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3371 | goto out; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3372 | ret = -EINTR; |
| 3373 | if (signal_pending(current)) |
| 3374 | goto out; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 3375 | /* This is for making all *used* pages to be on LRU. */ |
| 3376 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 3377 | drain_all_stock_sync(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3378 | ret = 0; |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 3379 | mem_cgroup_start_move(mem); |
KAMEZAWA Hiroyuki | 299b4ea | 2009-01-29 14:25:17 -0800 | [diff] [blame] | 3380 | for_each_node_state(node, N_HIGH_MEMORY) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3381 | for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) { |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 3382 | enum lru_list l; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3383 | for_each_lru(l) { |
| 3384 | ret = mem_cgroup_force_empty_list(mem, |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3385 | node, zid, l); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3386 | if (ret) |
| 3387 | break; |
| 3388 | } |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 3389 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3390 | if (ret) |
| 3391 | break; |
| 3392 | } |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 3393 | mem_cgroup_end_move(mem); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3394 | memcg_oom_recover(mem); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3395 | /* it seems parent cgroup doesn't have enough mem */ |
| 3396 | if (ret == -ENOMEM) |
| 3397 | goto try_to_free; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 3398 | cond_resched(); |
Daisuke Nishimura | fce6647 | 2010-01-15 17:01:30 -0800 | [diff] [blame] | 3399 | /* "ret" should also be checked to ensure all lists are empty. */ |
| 3400 | } while (mem->res.usage > 0 || ret); |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3401 | out: |
| 3402 | css_put(&mem->css); |
| 3403 | return ret; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3404 | |
| 3405 | try_to_free: |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3406 | /* returns EBUSY if there is a task or if we come here twice. */ |
| 3407 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children) || shrink) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3408 | ret = -EBUSY; |
| 3409 | goto out; |
| 3410 | } |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3411 | /* we call try-to-free pages for make this cgroup empty */ |
| 3412 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3413 | /* try to free all pages in this cgroup */ |
| 3414 | shrink = 1; |
| 3415 | while (nr_retries && mem->res.usage > 0) { |
| 3416 | int progress; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3417 | |
| 3418 | if (signal_pending(current)) { |
| 3419 | ret = -EINTR; |
| 3420 | goto out; |
| 3421 | } |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3422 | progress = try_to_free_mem_cgroup_pages(mem, GFP_KERNEL, |
| 3423 | false, get_swappiness(mem)); |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3424 | if (!progress) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3425 | nr_retries--; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3426 | /* maybe some writeback is necessary */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 3427 | congestion_wait(BLK_RW_ASYNC, HZ/10); |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3428 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3429 | |
| 3430 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3431 | lru_add_drain(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3432 | /* try move_account...there may be some *locked* pages. */ |
Daisuke Nishimura | fce6647 | 2010-01-15 17:01:30 -0800 | [diff] [blame] | 3433 | goto move_account; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3434 | } |
| 3435 | |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3436 | int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event) |
| 3437 | { |
| 3438 | return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true); |
| 3439 | } |
| 3440 | |
| 3441 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 3442 | static u64 mem_cgroup_hierarchy_read(struct cgroup *cont, struct cftype *cft) |
| 3443 | { |
| 3444 | return mem_cgroup_from_cont(cont)->use_hierarchy; |
| 3445 | } |
| 3446 | |
| 3447 | static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft, |
| 3448 | u64 val) |
| 3449 | { |
| 3450 | int retval = 0; |
| 3451 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
| 3452 | struct cgroup *parent = cont->parent; |
| 3453 | struct mem_cgroup *parent_mem = NULL; |
| 3454 | |
| 3455 | if (parent) |
| 3456 | parent_mem = mem_cgroup_from_cont(parent); |
| 3457 | |
| 3458 | cgroup_lock(); |
| 3459 | /* |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 3460 | * If parent's use_hierarchy is set, we can't make any modifications |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 3461 | * in the child subtrees. If it is unset, then the change can |
| 3462 | * occur, provided the current cgroup has no children. |
| 3463 | * |
| 3464 | * For the root cgroup, parent_mem is NULL, we allow value to be |
| 3465 | * set if there are no children. |
| 3466 | */ |
| 3467 | if ((!parent_mem || !parent_mem->use_hierarchy) && |
| 3468 | (val == 1 || val == 0)) { |
| 3469 | if (list_empty(&cont->children)) |
| 3470 | mem->use_hierarchy = val; |
| 3471 | else |
| 3472 | retval = -EBUSY; |
| 3473 | } else |
| 3474 | retval = -EINVAL; |
| 3475 | cgroup_unlock(); |
| 3476 | |
| 3477 | return retval; |
| 3478 | } |
| 3479 | |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3480 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3481 | static u64 mem_cgroup_get_recursive_idx_stat(struct mem_cgroup *mem, |
| 3482 | enum mem_cgroup_stat_index idx) |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3483 | { |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3484 | struct mem_cgroup *iter; |
| 3485 | s64 val = 0; |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3486 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3487 | /* each per cpu's value can be minus.Then, use s64 */ |
| 3488 | for_each_mem_cgroup_tree(iter, mem) |
| 3489 | val += mem_cgroup_read_stat(iter, idx); |
| 3490 | |
| 3491 | if (val < 0) /* race ? */ |
| 3492 | val = 0; |
| 3493 | return val; |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3494 | } |
| 3495 | |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3496 | static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap) |
| 3497 | { |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3498 | u64 val; |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3499 | |
| 3500 | if (!mem_cgroup_is_root(mem)) { |
| 3501 | if (!swap) |
| 3502 | return res_counter_read_u64(&mem->res, RES_USAGE); |
| 3503 | else |
| 3504 | return res_counter_read_u64(&mem->memsw, RES_USAGE); |
| 3505 | } |
| 3506 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3507 | val = mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_CACHE); |
| 3508 | val += mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_RSS); |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3509 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3510 | if (swap) |
| 3511 | val += mem_cgroup_get_recursive_idx_stat(mem, |
| 3512 | MEM_CGROUP_STAT_SWAPOUT); |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3513 | |
| 3514 | return val << PAGE_SHIFT; |
| 3515 | } |
| 3516 | |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 3517 | static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3518 | { |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3519 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3520 | u64 val; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3521 | int type, name; |
| 3522 | |
| 3523 | type = MEMFILE_TYPE(cft->private); |
| 3524 | name = MEMFILE_ATTR(cft->private); |
| 3525 | switch (type) { |
| 3526 | case _MEM: |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3527 | if (name == RES_USAGE) |
| 3528 | val = mem_cgroup_usage(mem, false); |
| 3529 | else |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3530 | val = res_counter_read_u64(&mem->res, name); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3531 | break; |
| 3532 | case _MEMSWAP: |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3533 | if (name == RES_USAGE) |
| 3534 | val = mem_cgroup_usage(mem, true); |
| 3535 | else |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3536 | val = res_counter_read_u64(&mem->memsw, name); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3537 | break; |
| 3538 | default: |
| 3539 | BUG(); |
| 3540 | break; |
| 3541 | } |
| 3542 | return val; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3543 | } |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3544 | /* |
| 3545 | * The user of this function is... |
| 3546 | * RES_LIMIT. |
| 3547 | */ |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 3548 | static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft, |
| 3549 | const char *buffer) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3550 | { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3551 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3552 | int type, name; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3553 | unsigned long long val; |
| 3554 | int ret; |
| 3555 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3556 | type = MEMFILE_TYPE(cft->private); |
| 3557 | name = MEMFILE_ATTR(cft->private); |
| 3558 | switch (name) { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3559 | case RES_LIMIT: |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 3560 | if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */ |
| 3561 | ret = -EINVAL; |
| 3562 | break; |
| 3563 | } |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3564 | /* This function does all necessary parse...reuse it */ |
| 3565 | ret = res_counter_memparse_write_strategy(buffer, &val); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3566 | if (ret) |
| 3567 | break; |
| 3568 | if (type == _MEM) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3569 | ret = mem_cgroup_resize_limit(memcg, val); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3570 | else |
| 3571 | ret = mem_cgroup_resize_memsw_limit(memcg, val); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3572 | break; |
Balbir Singh | 296c81d | 2009-09-23 15:56:36 -0700 | [diff] [blame] | 3573 | case RES_SOFT_LIMIT: |
| 3574 | ret = res_counter_memparse_write_strategy(buffer, &val); |
| 3575 | if (ret) |
| 3576 | break; |
| 3577 | /* |
| 3578 | * For memsw, soft limits are hard to implement in terms |
| 3579 | * of semantics, for now, we support soft limits for |
| 3580 | * control without swap |
| 3581 | */ |
| 3582 | if (type == _MEM) |
| 3583 | ret = res_counter_set_soft_limit(&memcg->res, val); |
| 3584 | else |
| 3585 | ret = -EINVAL; |
| 3586 | break; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3587 | default: |
| 3588 | ret = -EINVAL; /* should be BUG() ? */ |
| 3589 | break; |
| 3590 | } |
| 3591 | return ret; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3592 | } |
| 3593 | |
KAMEZAWA Hiroyuki | fee7b54 | 2009-01-07 18:08:26 -0800 | [diff] [blame] | 3594 | static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg, |
| 3595 | unsigned long long *mem_limit, unsigned long long *memsw_limit) |
| 3596 | { |
| 3597 | struct cgroup *cgroup; |
| 3598 | unsigned long long min_limit, min_memsw_limit, tmp; |
| 3599 | |
| 3600 | min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 3601 | min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 3602 | cgroup = memcg->css.cgroup; |
| 3603 | if (!memcg->use_hierarchy) |
| 3604 | goto out; |
| 3605 | |
| 3606 | while (cgroup->parent) { |
| 3607 | cgroup = cgroup->parent; |
| 3608 | memcg = mem_cgroup_from_cont(cgroup); |
| 3609 | if (!memcg->use_hierarchy) |
| 3610 | break; |
| 3611 | tmp = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 3612 | min_limit = min(min_limit, tmp); |
| 3613 | tmp = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 3614 | min_memsw_limit = min(min_memsw_limit, tmp); |
| 3615 | } |
| 3616 | out: |
| 3617 | *mem_limit = min_limit; |
| 3618 | *memsw_limit = min_memsw_limit; |
| 3619 | return; |
| 3620 | } |
| 3621 | |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3622 | static int mem_cgroup_reset(struct cgroup *cont, unsigned int event) |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3623 | { |
| 3624 | struct mem_cgroup *mem; |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3625 | int type, name; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3626 | |
| 3627 | mem = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3628 | type = MEMFILE_TYPE(event); |
| 3629 | name = MEMFILE_ATTR(event); |
| 3630 | switch (name) { |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3631 | case RES_MAX_USAGE: |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3632 | if (type == _MEM) |
| 3633 | res_counter_reset_max(&mem->res); |
| 3634 | else |
| 3635 | res_counter_reset_max(&mem->memsw); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3636 | break; |
| 3637 | case RES_FAILCNT: |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3638 | if (type == _MEM) |
| 3639 | res_counter_reset_failcnt(&mem->res); |
| 3640 | else |
| 3641 | res_counter_reset_failcnt(&mem->memsw); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3642 | break; |
| 3643 | } |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 3644 | |
Pavel Emelyanov | 85cc59d | 2008-04-29 01:00:20 -0700 | [diff] [blame] | 3645 | return 0; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3646 | } |
| 3647 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3648 | static u64 mem_cgroup_move_charge_read(struct cgroup *cgrp, |
| 3649 | struct cftype *cft) |
| 3650 | { |
| 3651 | return mem_cgroup_from_cont(cgrp)->move_charge_at_immigrate; |
| 3652 | } |
| 3653 | |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 3654 | #ifdef CONFIG_MMU |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3655 | static int mem_cgroup_move_charge_write(struct cgroup *cgrp, |
| 3656 | struct cftype *cft, u64 val) |
| 3657 | { |
| 3658 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); |
| 3659 | |
| 3660 | if (val >= (1 << NR_MOVE_TYPE)) |
| 3661 | return -EINVAL; |
| 3662 | /* |
| 3663 | * We check this value several times in both in can_attach() and |
| 3664 | * attach(), so we need cgroup lock to prevent this value from being |
| 3665 | * inconsistent. |
| 3666 | */ |
| 3667 | cgroup_lock(); |
| 3668 | mem->move_charge_at_immigrate = val; |
| 3669 | cgroup_unlock(); |
| 3670 | |
| 3671 | return 0; |
| 3672 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 3673 | #else |
| 3674 | static int mem_cgroup_move_charge_write(struct cgroup *cgrp, |
| 3675 | struct cftype *cft, u64 val) |
| 3676 | { |
| 3677 | return -ENOSYS; |
| 3678 | } |
| 3679 | #endif |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3680 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3681 | |
| 3682 | /* For read statistics */ |
| 3683 | enum { |
| 3684 | MCS_CACHE, |
| 3685 | MCS_RSS, |
KAMEZAWA Hiroyuki | d804658 | 2009-12-15 16:47:09 -0800 | [diff] [blame] | 3686 | MCS_FILE_MAPPED, |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3687 | MCS_PGPGIN, |
| 3688 | MCS_PGPGOUT, |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3689 | MCS_SWAP, |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3690 | MCS_INACTIVE_ANON, |
| 3691 | MCS_ACTIVE_ANON, |
| 3692 | MCS_INACTIVE_FILE, |
| 3693 | MCS_ACTIVE_FILE, |
| 3694 | MCS_UNEVICTABLE, |
| 3695 | NR_MCS_STAT, |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3696 | }; |
| 3697 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3698 | struct mcs_total_stat { |
| 3699 | s64 stat[NR_MCS_STAT]; |
| 3700 | }; |
| 3701 | |
| 3702 | struct { |
| 3703 | char *local_name; |
| 3704 | char *total_name; |
| 3705 | } memcg_stat_strings[NR_MCS_STAT] = { |
| 3706 | {"cache", "total_cache"}, |
| 3707 | {"rss", "total_rss"}, |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 3708 | {"mapped_file", "total_mapped_file"}, |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3709 | {"pgpgin", "total_pgpgin"}, |
| 3710 | {"pgpgout", "total_pgpgout"}, |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3711 | {"swap", "total_swap"}, |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3712 | {"inactive_anon", "total_inactive_anon"}, |
| 3713 | {"active_anon", "total_active_anon"}, |
| 3714 | {"inactive_file", "total_inactive_file"}, |
| 3715 | {"active_file", "total_active_file"}, |
| 3716 | {"unevictable", "total_unevictable"} |
| 3717 | }; |
| 3718 | |
| 3719 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3720 | static void |
| 3721 | mem_cgroup_get_local_stat(struct mem_cgroup *mem, struct mcs_total_stat *s) |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3722 | { |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3723 | s64 val; |
| 3724 | |
| 3725 | /* per cpu stat */ |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3726 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3727 | s->stat[MCS_CACHE] += val * PAGE_SIZE; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3728 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3729 | s->stat[MCS_RSS] += val * PAGE_SIZE; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3730 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_FILE_MAPPED); |
KAMEZAWA Hiroyuki | d804658 | 2009-12-15 16:47:09 -0800 | [diff] [blame] | 3731 | s->stat[MCS_FILE_MAPPED] += val * PAGE_SIZE; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3732 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGIN_COUNT); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3733 | s->stat[MCS_PGPGIN] += val; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3734 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGOUT_COUNT); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3735 | s->stat[MCS_PGPGOUT] += val; |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3736 | if (do_swap_account) { |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3737 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_SWAPOUT); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3738 | s->stat[MCS_SWAP] += val * PAGE_SIZE; |
| 3739 | } |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3740 | |
| 3741 | /* per zone stat */ |
| 3742 | val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_ANON); |
| 3743 | s->stat[MCS_INACTIVE_ANON] += val * PAGE_SIZE; |
| 3744 | val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_ANON); |
| 3745 | s->stat[MCS_ACTIVE_ANON] += val * PAGE_SIZE; |
| 3746 | val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_FILE); |
| 3747 | s->stat[MCS_INACTIVE_FILE] += val * PAGE_SIZE; |
| 3748 | val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_FILE); |
| 3749 | s->stat[MCS_ACTIVE_FILE] += val * PAGE_SIZE; |
| 3750 | val = mem_cgroup_get_local_zonestat(mem, LRU_UNEVICTABLE); |
| 3751 | s->stat[MCS_UNEVICTABLE] += val * PAGE_SIZE; |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3752 | } |
| 3753 | |
| 3754 | static void |
| 3755 | mem_cgroup_get_total_stat(struct mem_cgroup *mem, struct mcs_total_stat *s) |
| 3756 | { |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3757 | struct mem_cgroup *iter; |
| 3758 | |
| 3759 | for_each_mem_cgroup_tree(iter, mem) |
| 3760 | mem_cgroup_get_local_stat(iter, s); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3761 | } |
| 3762 | |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 3763 | static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft, |
| 3764 | struct cgroup_map_cb *cb) |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3765 | { |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3766 | struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3767 | struct mcs_total_stat mystat; |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3768 | int i; |
| 3769 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3770 | memset(&mystat, 0, sizeof(mystat)); |
| 3771 | mem_cgroup_get_local_stat(mem_cont, &mystat); |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3772 | |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3773 | for (i = 0; i < NR_MCS_STAT; i++) { |
| 3774 | if (i == MCS_SWAP && !do_swap_account) |
| 3775 | continue; |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3776 | cb->fill(cb, memcg_stat_strings[i].local_name, mystat.stat[i]); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3777 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 3778 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3779 | /* Hierarchical information */ |
KAMEZAWA Hiroyuki | fee7b54 | 2009-01-07 18:08:26 -0800 | [diff] [blame] | 3780 | { |
| 3781 | unsigned long long limit, memsw_limit; |
| 3782 | memcg_get_hierarchical_limit(mem_cont, &limit, &memsw_limit); |
| 3783 | cb->fill(cb, "hierarchical_memory_limit", limit); |
| 3784 | if (do_swap_account) |
| 3785 | cb->fill(cb, "hierarchical_memsw_limit", memsw_limit); |
| 3786 | } |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3787 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3788 | memset(&mystat, 0, sizeof(mystat)); |
| 3789 | mem_cgroup_get_total_stat(mem_cont, &mystat); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3790 | for (i = 0; i < NR_MCS_STAT; i++) { |
| 3791 | if (i == MCS_SWAP && !do_swap_account) |
| 3792 | continue; |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3793 | cb->fill(cb, memcg_stat_strings[i].total_name, mystat.stat[i]); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3794 | } |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3795 | |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3796 | #ifdef CONFIG_DEBUG_VM |
KOSAKI Motohiro | c772be9 | 2009-01-07 18:08:25 -0800 | [diff] [blame] | 3797 | cb->fill(cb, "inactive_ratio", calc_inactive_ratio(mem_cont, NULL)); |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3798 | |
| 3799 | { |
| 3800 | int nid, zid; |
| 3801 | struct mem_cgroup_per_zone *mz; |
| 3802 | unsigned long recent_rotated[2] = {0, 0}; |
| 3803 | unsigned long recent_scanned[2] = {0, 0}; |
| 3804 | |
| 3805 | for_each_online_node(nid) |
| 3806 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { |
| 3807 | mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
| 3808 | |
| 3809 | recent_rotated[0] += |
| 3810 | mz->reclaim_stat.recent_rotated[0]; |
| 3811 | recent_rotated[1] += |
| 3812 | mz->reclaim_stat.recent_rotated[1]; |
| 3813 | recent_scanned[0] += |
| 3814 | mz->reclaim_stat.recent_scanned[0]; |
| 3815 | recent_scanned[1] += |
| 3816 | mz->reclaim_stat.recent_scanned[1]; |
| 3817 | } |
| 3818 | cb->fill(cb, "recent_rotated_anon", recent_rotated[0]); |
| 3819 | cb->fill(cb, "recent_rotated_file", recent_rotated[1]); |
| 3820 | cb->fill(cb, "recent_scanned_anon", recent_scanned[0]); |
| 3821 | cb->fill(cb, "recent_scanned_file", recent_scanned[1]); |
| 3822 | } |
| 3823 | #endif |
| 3824 | |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3825 | return 0; |
| 3826 | } |
| 3827 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3828 | static u64 mem_cgroup_swappiness_read(struct cgroup *cgrp, struct cftype *cft) |
| 3829 | { |
| 3830 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
| 3831 | |
| 3832 | return get_swappiness(memcg); |
| 3833 | } |
| 3834 | |
| 3835 | static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft, |
| 3836 | u64 val) |
| 3837 | { |
| 3838 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
| 3839 | struct mem_cgroup *parent; |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3840 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3841 | if (val > 100) |
| 3842 | return -EINVAL; |
| 3843 | |
| 3844 | if (cgrp->parent == NULL) |
| 3845 | return -EINVAL; |
| 3846 | |
| 3847 | parent = mem_cgroup_from_cont(cgrp->parent); |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3848 | |
| 3849 | cgroup_lock(); |
| 3850 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3851 | /* If under hierarchy, only empty-root can set this value */ |
| 3852 | if ((parent->use_hierarchy) || |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3853 | (memcg->use_hierarchy && !list_empty(&cgrp->children))) { |
| 3854 | cgroup_unlock(); |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3855 | return -EINVAL; |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3856 | } |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3857 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3858 | memcg->swappiness = val; |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3859 | |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3860 | cgroup_unlock(); |
| 3861 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3862 | return 0; |
| 3863 | } |
| 3864 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3865 | static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap) |
| 3866 | { |
| 3867 | struct mem_cgroup_threshold_ary *t; |
| 3868 | u64 usage; |
| 3869 | int i; |
| 3870 | |
| 3871 | rcu_read_lock(); |
| 3872 | if (!swap) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3873 | t = rcu_dereference(memcg->thresholds.primary); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3874 | else |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3875 | t = rcu_dereference(memcg->memsw_thresholds.primary); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3876 | |
| 3877 | if (!t) |
| 3878 | goto unlock; |
| 3879 | |
| 3880 | usage = mem_cgroup_usage(memcg, swap); |
| 3881 | |
| 3882 | /* |
| 3883 | * current_threshold points to threshold just below usage. |
| 3884 | * If it's not true, a threshold was crossed after last |
| 3885 | * call of __mem_cgroup_threshold(). |
| 3886 | */ |
Phil Carmody | 5407a56 | 2010-05-26 14:42:42 -0700 | [diff] [blame] | 3887 | i = t->current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3888 | |
| 3889 | /* |
| 3890 | * Iterate backward over array of thresholds starting from |
| 3891 | * current_threshold and check if a threshold is crossed. |
| 3892 | * If none of thresholds below usage is crossed, we read |
| 3893 | * only one element of the array here. |
| 3894 | */ |
| 3895 | for (; i >= 0 && unlikely(t->entries[i].threshold > usage); i--) |
| 3896 | eventfd_signal(t->entries[i].eventfd, 1); |
| 3897 | |
| 3898 | /* i = current_threshold + 1 */ |
| 3899 | i++; |
| 3900 | |
| 3901 | /* |
| 3902 | * Iterate forward over array of thresholds starting from |
| 3903 | * current_threshold+1 and check if a threshold is crossed. |
| 3904 | * If none of thresholds above usage is crossed, we read |
| 3905 | * only one element of the array here. |
| 3906 | */ |
| 3907 | for (; i < t->size && unlikely(t->entries[i].threshold <= usage); i++) |
| 3908 | eventfd_signal(t->entries[i].eventfd, 1); |
| 3909 | |
| 3910 | /* Update current_threshold */ |
Phil Carmody | 5407a56 | 2010-05-26 14:42:42 -0700 | [diff] [blame] | 3911 | t->current_threshold = i - 1; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3912 | unlock: |
| 3913 | rcu_read_unlock(); |
| 3914 | } |
| 3915 | |
| 3916 | static void mem_cgroup_threshold(struct mem_cgroup *memcg) |
| 3917 | { |
Kirill A. Shutemov | ad4ca5f | 2010-10-07 12:59:27 -0700 | [diff] [blame] | 3918 | while (memcg) { |
| 3919 | __mem_cgroup_threshold(memcg, false); |
| 3920 | if (do_swap_account) |
| 3921 | __mem_cgroup_threshold(memcg, true); |
| 3922 | |
| 3923 | memcg = parent_mem_cgroup(memcg); |
| 3924 | } |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3925 | } |
| 3926 | |
| 3927 | static int compare_thresholds(const void *a, const void *b) |
| 3928 | { |
| 3929 | const struct mem_cgroup_threshold *_a = a; |
| 3930 | const struct mem_cgroup_threshold *_b = b; |
| 3931 | |
| 3932 | return _a->threshold - _b->threshold; |
| 3933 | } |
| 3934 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3935 | static int mem_cgroup_oom_notify_cb(struct mem_cgroup *mem) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3936 | { |
| 3937 | struct mem_cgroup_eventfd_list *ev; |
| 3938 | |
| 3939 | list_for_each_entry(ev, &mem->oom_notify, list) |
| 3940 | eventfd_signal(ev->eventfd, 1); |
| 3941 | return 0; |
| 3942 | } |
| 3943 | |
| 3944 | static void mem_cgroup_oom_notify(struct mem_cgroup *mem) |
| 3945 | { |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3946 | struct mem_cgroup *iter; |
| 3947 | |
| 3948 | for_each_mem_cgroup_tree(iter, mem) |
| 3949 | mem_cgroup_oom_notify_cb(iter); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3950 | } |
| 3951 | |
| 3952 | static int mem_cgroup_usage_register_event(struct cgroup *cgrp, |
| 3953 | struct cftype *cft, struct eventfd_ctx *eventfd, const char *args) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3954 | { |
| 3955 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3956 | struct mem_cgroup_thresholds *thresholds; |
| 3957 | struct mem_cgroup_threshold_ary *new; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3958 | int type = MEMFILE_TYPE(cft->private); |
| 3959 | u64 threshold, usage; |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3960 | int i, size, ret; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3961 | |
| 3962 | ret = res_counter_memparse_write_strategy(args, &threshold); |
| 3963 | if (ret) |
| 3964 | return ret; |
| 3965 | |
| 3966 | mutex_lock(&memcg->thresholds_lock); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3967 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3968 | if (type == _MEM) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3969 | thresholds = &memcg->thresholds; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3970 | else if (type == _MEMSWAP) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3971 | thresholds = &memcg->memsw_thresholds; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3972 | else |
| 3973 | BUG(); |
| 3974 | |
| 3975 | usage = mem_cgroup_usage(memcg, type == _MEMSWAP); |
| 3976 | |
| 3977 | /* Check if a threshold crossed before adding a new one */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3978 | if (thresholds->primary) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3979 | __mem_cgroup_threshold(memcg, type == _MEMSWAP); |
| 3980 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3981 | size = thresholds->primary ? thresholds->primary->size + 1 : 1; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3982 | |
| 3983 | /* Allocate memory for new array of thresholds */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3984 | new = kmalloc(sizeof(*new) + size * sizeof(struct mem_cgroup_threshold), |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3985 | GFP_KERNEL); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3986 | if (!new) { |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3987 | ret = -ENOMEM; |
| 3988 | goto unlock; |
| 3989 | } |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3990 | new->size = size; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3991 | |
| 3992 | /* Copy thresholds (if any) to new array */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3993 | if (thresholds->primary) { |
| 3994 | memcpy(new->entries, thresholds->primary->entries, (size - 1) * |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3995 | sizeof(struct mem_cgroup_threshold)); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3996 | } |
| 3997 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3998 | /* Add new threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3999 | new->entries[size - 1].eventfd = eventfd; |
| 4000 | new->entries[size - 1].threshold = threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4001 | |
| 4002 | /* Sort thresholds. Registering of new threshold isn't time-critical */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4003 | sort(new->entries, size, sizeof(struct mem_cgroup_threshold), |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4004 | compare_thresholds, NULL); |
| 4005 | |
| 4006 | /* Find current threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4007 | new->current_threshold = -1; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4008 | for (i = 0; i < size; i++) { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4009 | if (new->entries[i].threshold < usage) { |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4010 | /* |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4011 | * new->current_threshold will not be used until |
| 4012 | * rcu_assign_pointer(), so it's safe to increment |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4013 | * it here. |
| 4014 | */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4015 | ++new->current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4016 | } |
| 4017 | } |
| 4018 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4019 | /* Free old spare buffer and save old primary buffer as spare */ |
| 4020 | kfree(thresholds->spare); |
| 4021 | thresholds->spare = thresholds->primary; |
| 4022 | |
| 4023 | rcu_assign_pointer(thresholds->primary, new); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4024 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 4025 | /* To be sure that nobody uses thresholds */ |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4026 | synchronize_rcu(); |
| 4027 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4028 | unlock: |
| 4029 | mutex_unlock(&memcg->thresholds_lock); |
| 4030 | |
| 4031 | return ret; |
| 4032 | } |
| 4033 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 4034 | static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4035 | struct cftype *cft, struct eventfd_ctx *eventfd) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4036 | { |
| 4037 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4038 | struct mem_cgroup_thresholds *thresholds; |
| 4039 | struct mem_cgroup_threshold_ary *new; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4040 | int type = MEMFILE_TYPE(cft->private); |
| 4041 | u64 usage; |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4042 | int i, j, size; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4043 | |
| 4044 | mutex_lock(&memcg->thresholds_lock); |
| 4045 | if (type == _MEM) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4046 | thresholds = &memcg->thresholds; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4047 | else if (type == _MEMSWAP) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4048 | thresholds = &memcg->memsw_thresholds; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4049 | else |
| 4050 | BUG(); |
| 4051 | |
| 4052 | /* |
| 4053 | * Something went wrong if we trying to unregister a threshold |
| 4054 | * if we don't have thresholds |
| 4055 | */ |
| 4056 | BUG_ON(!thresholds); |
| 4057 | |
| 4058 | usage = mem_cgroup_usage(memcg, type == _MEMSWAP); |
| 4059 | |
| 4060 | /* Check if a threshold crossed before removing */ |
| 4061 | __mem_cgroup_threshold(memcg, type == _MEMSWAP); |
| 4062 | |
| 4063 | /* Calculate new number of threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4064 | size = 0; |
| 4065 | for (i = 0; i < thresholds->primary->size; i++) { |
| 4066 | if (thresholds->primary->entries[i].eventfd != eventfd) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4067 | size++; |
| 4068 | } |
| 4069 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4070 | new = thresholds->spare; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 4071 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4072 | /* Set thresholds array to NULL if we don't have thresholds */ |
| 4073 | if (!size) { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4074 | kfree(new); |
| 4075 | new = NULL; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 4076 | goto swap_buffers; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4077 | } |
| 4078 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4079 | new->size = size; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4080 | |
| 4081 | /* Copy thresholds and find current threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4082 | new->current_threshold = -1; |
| 4083 | for (i = 0, j = 0; i < thresholds->primary->size; i++) { |
| 4084 | if (thresholds->primary->entries[i].eventfd == eventfd) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4085 | continue; |
| 4086 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4087 | new->entries[j] = thresholds->primary->entries[i]; |
| 4088 | if (new->entries[j].threshold < usage) { |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4089 | /* |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4090 | * new->current_threshold will not be used |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4091 | * until rcu_assign_pointer(), so it's safe to increment |
| 4092 | * it here. |
| 4093 | */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4094 | ++new->current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4095 | } |
| 4096 | j++; |
| 4097 | } |
| 4098 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 4099 | swap_buffers: |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 4100 | /* Swap primary and spare array */ |
| 4101 | thresholds->spare = thresholds->primary; |
| 4102 | rcu_assign_pointer(thresholds->primary, new); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4103 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 4104 | /* To be sure that nobody uses thresholds */ |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4105 | synchronize_rcu(); |
| 4106 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4107 | mutex_unlock(&memcg->thresholds_lock); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4108 | } |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 4109 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4110 | static int mem_cgroup_oom_register_event(struct cgroup *cgrp, |
| 4111 | struct cftype *cft, struct eventfd_ctx *eventfd, const char *args) |
| 4112 | { |
| 4113 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
| 4114 | struct mem_cgroup_eventfd_list *event; |
| 4115 | int type = MEMFILE_TYPE(cft->private); |
| 4116 | |
| 4117 | BUG_ON(type != _OOM_TYPE); |
| 4118 | event = kmalloc(sizeof(*event), GFP_KERNEL); |
| 4119 | if (!event) |
| 4120 | return -ENOMEM; |
| 4121 | |
| 4122 | mutex_lock(&memcg_oom_mutex); |
| 4123 | |
| 4124 | event->eventfd = eventfd; |
| 4125 | list_add(&event->list, &memcg->oom_notify); |
| 4126 | |
| 4127 | /* already in OOM ? */ |
| 4128 | if (atomic_read(&memcg->oom_lock)) |
| 4129 | eventfd_signal(eventfd, 1); |
| 4130 | mutex_unlock(&memcg_oom_mutex); |
| 4131 | |
| 4132 | return 0; |
| 4133 | } |
| 4134 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 4135 | static void mem_cgroup_oom_unregister_event(struct cgroup *cgrp, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4136 | struct cftype *cft, struct eventfd_ctx *eventfd) |
| 4137 | { |
| 4138 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); |
| 4139 | struct mem_cgroup_eventfd_list *ev, *tmp; |
| 4140 | int type = MEMFILE_TYPE(cft->private); |
| 4141 | |
| 4142 | BUG_ON(type != _OOM_TYPE); |
| 4143 | |
| 4144 | mutex_lock(&memcg_oom_mutex); |
| 4145 | |
| 4146 | list_for_each_entry_safe(ev, tmp, &mem->oom_notify, list) { |
| 4147 | if (ev->eventfd == eventfd) { |
| 4148 | list_del(&ev->list); |
| 4149 | kfree(ev); |
| 4150 | } |
| 4151 | } |
| 4152 | |
| 4153 | mutex_unlock(&memcg_oom_mutex); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4154 | } |
| 4155 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 4156 | static int mem_cgroup_oom_control_read(struct cgroup *cgrp, |
| 4157 | struct cftype *cft, struct cgroup_map_cb *cb) |
| 4158 | { |
| 4159 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); |
| 4160 | |
| 4161 | cb->fill(cb, "oom_kill_disable", mem->oom_kill_disable); |
| 4162 | |
| 4163 | if (atomic_read(&mem->oom_lock)) |
| 4164 | cb->fill(cb, "under_oom", 1); |
| 4165 | else |
| 4166 | cb->fill(cb, "under_oom", 0); |
| 4167 | return 0; |
| 4168 | } |
| 4169 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 4170 | static int mem_cgroup_oom_control_write(struct cgroup *cgrp, |
| 4171 | struct cftype *cft, u64 val) |
| 4172 | { |
| 4173 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); |
| 4174 | struct mem_cgroup *parent; |
| 4175 | |
| 4176 | /* cannot set to root cgroup and only 0 and 1 are allowed */ |
| 4177 | if (!cgrp->parent || !((val == 0) || (val == 1))) |
| 4178 | return -EINVAL; |
| 4179 | |
| 4180 | parent = mem_cgroup_from_cont(cgrp->parent); |
| 4181 | |
| 4182 | cgroup_lock(); |
| 4183 | /* oom-kill-disable is a flag for subhierarchy. */ |
| 4184 | if ((parent->use_hierarchy) || |
| 4185 | (mem->use_hierarchy && !list_empty(&cgrp->children))) { |
| 4186 | cgroup_unlock(); |
| 4187 | return -EINVAL; |
| 4188 | } |
| 4189 | mem->oom_kill_disable = val; |
KAMEZAWA Hiroyuki | 4d845eb | 2010-06-29 15:05:18 -0700 | [diff] [blame] | 4190 | if (!val) |
| 4191 | memcg_oom_recover(mem); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 4192 | cgroup_unlock(); |
| 4193 | return 0; |
| 4194 | } |
| 4195 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4196 | static struct cftype mem_cgroup_files[] = { |
| 4197 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 4198 | .name = "usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4199 | .private = MEMFILE_PRIVATE(_MEM, RES_USAGE), |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 4200 | .read_u64 = mem_cgroup_read, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4201 | .register_event = mem_cgroup_usage_register_event, |
| 4202 | .unregister_event = mem_cgroup_usage_unregister_event, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4203 | }, |
| 4204 | { |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 4205 | .name = "max_usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4206 | .private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE), |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 4207 | .trigger = mem_cgroup_reset, |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 4208 | .read_u64 = mem_cgroup_read, |
| 4209 | }, |
| 4210 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 4211 | .name = "limit_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4212 | .private = MEMFILE_PRIVATE(_MEM, RES_LIMIT), |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 4213 | .write_string = mem_cgroup_write, |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 4214 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4215 | }, |
| 4216 | { |
Balbir Singh | 296c81d | 2009-09-23 15:56:36 -0700 | [diff] [blame] | 4217 | .name = "soft_limit_in_bytes", |
| 4218 | .private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT), |
| 4219 | .write_string = mem_cgroup_write, |
| 4220 | .read_u64 = mem_cgroup_read, |
| 4221 | }, |
| 4222 | { |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4223 | .name = "failcnt", |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4224 | .private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT), |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 4225 | .trigger = mem_cgroup_reset, |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 4226 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4227 | }, |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 4228 | { |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 4229 | .name = "stat", |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 4230 | .read_map = mem_control_stat_show, |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 4231 | }, |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 4232 | { |
| 4233 | .name = "force_empty", |
| 4234 | .trigger = mem_cgroup_force_empty_write, |
| 4235 | }, |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4236 | { |
| 4237 | .name = "use_hierarchy", |
| 4238 | .write_u64 = mem_cgroup_hierarchy_write, |
| 4239 | .read_u64 = mem_cgroup_hierarchy_read, |
| 4240 | }, |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 4241 | { |
| 4242 | .name = "swappiness", |
| 4243 | .read_u64 = mem_cgroup_swappiness_read, |
| 4244 | .write_u64 = mem_cgroup_swappiness_write, |
| 4245 | }, |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4246 | { |
| 4247 | .name = "move_charge_at_immigrate", |
| 4248 | .read_u64 = mem_cgroup_move_charge_read, |
| 4249 | .write_u64 = mem_cgroup_move_charge_write, |
| 4250 | }, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4251 | { |
| 4252 | .name = "oom_control", |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 4253 | .read_map = mem_cgroup_oom_control_read, |
| 4254 | .write_u64 = mem_cgroup_oom_control_write, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4255 | .register_event = mem_cgroup_oom_register_event, |
| 4256 | .unregister_event = mem_cgroup_oom_unregister_event, |
| 4257 | .private = MEMFILE_PRIVATE(_OOM_TYPE, OOM_CONTROL), |
| 4258 | }, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4259 | }; |
| 4260 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4261 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 4262 | static struct cftype memsw_cgroup_files[] = { |
| 4263 | { |
| 4264 | .name = "memsw.usage_in_bytes", |
| 4265 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE), |
| 4266 | .read_u64 = mem_cgroup_read, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4267 | .register_event = mem_cgroup_usage_register_event, |
| 4268 | .unregister_event = mem_cgroup_usage_unregister_event, |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4269 | }, |
| 4270 | { |
| 4271 | .name = "memsw.max_usage_in_bytes", |
| 4272 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE), |
| 4273 | .trigger = mem_cgroup_reset, |
| 4274 | .read_u64 = mem_cgroup_read, |
| 4275 | }, |
| 4276 | { |
| 4277 | .name = "memsw.limit_in_bytes", |
| 4278 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT), |
| 4279 | .write_string = mem_cgroup_write, |
| 4280 | .read_u64 = mem_cgroup_read, |
| 4281 | }, |
| 4282 | { |
| 4283 | .name = "memsw.failcnt", |
| 4284 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT), |
| 4285 | .trigger = mem_cgroup_reset, |
| 4286 | .read_u64 = mem_cgroup_read, |
| 4287 | }, |
| 4288 | }; |
| 4289 | |
| 4290 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) |
| 4291 | { |
| 4292 | if (!do_swap_account) |
| 4293 | return 0; |
| 4294 | return cgroup_add_files(cont, ss, memsw_cgroup_files, |
| 4295 | ARRAY_SIZE(memsw_cgroup_files)); |
| 4296 | }; |
| 4297 | #else |
| 4298 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) |
| 4299 | { |
| 4300 | return 0; |
| 4301 | } |
| 4302 | #endif |
| 4303 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4304 | static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
| 4305 | { |
| 4306 | struct mem_cgroup_per_node *pn; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4307 | struct mem_cgroup_per_zone *mz; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 4308 | enum lru_list l; |
KAMEZAWA Hiroyuki | 41e3355 | 2008-04-08 17:41:54 -0700 | [diff] [blame] | 4309 | int zone, tmp = node; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4310 | /* |
| 4311 | * This routine is called against possible nodes. |
| 4312 | * But it's BUG to call kmalloc() against offline node. |
| 4313 | * |
| 4314 | * TODO: this routine can waste much memory for nodes which will |
| 4315 | * never be onlined. It's better to use memory hotplug callback |
| 4316 | * function. |
| 4317 | */ |
KAMEZAWA Hiroyuki | 41e3355 | 2008-04-08 17:41:54 -0700 | [diff] [blame] | 4318 | if (!node_state(node, N_NORMAL_MEMORY)) |
| 4319 | tmp = -1; |
Jesper Juhl | 17295c8 | 2011-01-13 15:47:42 -0800 | [diff] [blame] | 4320 | pn = kzalloc_node(sizeof(*pn), GFP_KERNEL, tmp); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4321 | if (!pn) |
| 4322 | return 1; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4323 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4324 | mem->info.nodeinfo[node] = pn; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4325 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { |
| 4326 | mz = &pn->zoneinfo[zone]; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 4327 | for_each_lru(l) |
| 4328 | INIT_LIST_HEAD(&mz->lists[l]); |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 4329 | mz->usage_in_excess = 0; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 4330 | mz->on_tree = false; |
| 4331 | mz->mem = mem; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4332 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4333 | return 0; |
| 4334 | } |
| 4335 | |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4336 | static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
| 4337 | { |
| 4338 | kfree(mem->info.nodeinfo[node]); |
| 4339 | } |
| 4340 | |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4341 | static struct mem_cgroup *mem_cgroup_alloc(void) |
| 4342 | { |
| 4343 | struct mem_cgroup *mem; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 4344 | int size = sizeof(struct mem_cgroup); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4345 | |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 4346 | /* Can be very big if MAX_NUMNODES is very big */ |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 4347 | if (size < PAGE_SIZE) |
Jesper Juhl | 17295c8 | 2011-01-13 15:47:42 -0800 | [diff] [blame] | 4348 | mem = kzalloc(size, GFP_KERNEL); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4349 | else |
Jesper Juhl | 17295c8 | 2011-01-13 15:47:42 -0800 | [diff] [blame] | 4350 | mem = vzalloc(size); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4351 | |
Dan Carpenter | e7bbcdf | 2010-03-23 13:35:12 -0700 | [diff] [blame] | 4352 | if (!mem) |
| 4353 | return NULL; |
| 4354 | |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 4355 | mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu); |
Dan Carpenter | d2e61b8 | 2010-11-11 14:05:12 -0800 | [diff] [blame] | 4356 | if (!mem->stat) |
| 4357 | goto out_free; |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 4358 | spin_lock_init(&mem->pcp_counter_lock); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4359 | return mem; |
Dan Carpenter | d2e61b8 | 2010-11-11 14:05:12 -0800 | [diff] [blame] | 4360 | |
| 4361 | out_free: |
| 4362 | if (size < PAGE_SIZE) |
| 4363 | kfree(mem); |
| 4364 | else |
| 4365 | vfree(mem); |
| 4366 | return NULL; |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4367 | } |
| 4368 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4369 | /* |
| 4370 | * At destroying mem_cgroup, references from swap_cgroup can remain. |
| 4371 | * (scanning all at force_empty is too costly...) |
| 4372 | * |
| 4373 | * Instead of clearing all references at force_empty, we remember |
| 4374 | * the number of reference from swap_cgroup and free mem_cgroup when |
| 4375 | * it goes down to 0. |
| 4376 | * |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4377 | * Removal of cgroup itself succeeds regardless of refs from swap. |
| 4378 | */ |
| 4379 | |
KAMEZAWA Hiroyuki | a7ba0ee | 2009-01-07 18:08:32 -0800 | [diff] [blame] | 4380 | static void __mem_cgroup_free(struct mem_cgroup *mem) |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4381 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 4382 | int node; |
| 4383 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 4384 | mem_cgroup_remove_from_trees(mem); |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4385 | free_css_id(&mem_cgroup_subsys, &mem->css); |
| 4386 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 4387 | for_each_node_state(node, N_POSSIBLE) |
| 4388 | free_mem_cgroup_per_zone_info(mem, node); |
| 4389 | |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 4390 | free_percpu(mem->stat); |
| 4391 | if (sizeof(struct mem_cgroup) < PAGE_SIZE) |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4392 | kfree(mem); |
| 4393 | else |
| 4394 | vfree(mem); |
| 4395 | } |
| 4396 | |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4397 | static void mem_cgroup_get(struct mem_cgroup *mem) |
| 4398 | { |
| 4399 | atomic_inc(&mem->refcnt); |
| 4400 | } |
| 4401 | |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4402 | static void __mem_cgroup_put(struct mem_cgroup *mem, int count) |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4403 | { |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4404 | if (atomic_sub_and_test(count, &mem->refcnt)) { |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 4405 | struct mem_cgroup *parent = parent_mem_cgroup(mem); |
KAMEZAWA Hiroyuki | a7ba0ee | 2009-01-07 18:08:32 -0800 | [diff] [blame] | 4406 | __mem_cgroup_free(mem); |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 4407 | if (parent) |
| 4408 | mem_cgroup_put(parent); |
| 4409 | } |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4410 | } |
| 4411 | |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4412 | static void mem_cgroup_put(struct mem_cgroup *mem) |
| 4413 | { |
| 4414 | __mem_cgroup_put(mem, 1); |
| 4415 | } |
| 4416 | |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 4417 | /* |
| 4418 | * Returns the parent mem_cgroup in memcgroup hierarchy with hierarchy enabled. |
| 4419 | */ |
| 4420 | static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem) |
| 4421 | { |
| 4422 | if (!mem->res.parent) |
| 4423 | return NULL; |
| 4424 | return mem_cgroup_from_res_counter(mem->res.parent, res); |
| 4425 | } |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4426 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 4427 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 4428 | static void __init enable_swap_cgroup(void) |
| 4429 | { |
Hirokazu Takahashi | f8d6654 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 4430 | if (!mem_cgroup_disabled() && really_do_swap_account) |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 4431 | do_swap_account = 1; |
| 4432 | } |
| 4433 | #else |
| 4434 | static void __init enable_swap_cgroup(void) |
| 4435 | { |
| 4436 | } |
| 4437 | #endif |
| 4438 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 4439 | static int mem_cgroup_soft_limit_tree_init(void) |
| 4440 | { |
| 4441 | struct mem_cgroup_tree_per_node *rtpn; |
| 4442 | struct mem_cgroup_tree_per_zone *rtpz; |
| 4443 | int tmp, node, zone; |
| 4444 | |
| 4445 | for_each_node_state(node, N_POSSIBLE) { |
| 4446 | tmp = node; |
| 4447 | if (!node_state(node, N_NORMAL_MEMORY)) |
| 4448 | tmp = -1; |
| 4449 | rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp); |
| 4450 | if (!rtpn) |
| 4451 | return 1; |
| 4452 | |
| 4453 | soft_limit_tree.rb_tree_per_node[node] = rtpn; |
| 4454 | |
| 4455 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { |
| 4456 | rtpz = &rtpn->rb_tree_per_zone[zone]; |
| 4457 | rtpz->rb_root = RB_ROOT; |
| 4458 | spin_lock_init(&rtpz->lock); |
| 4459 | } |
| 4460 | } |
| 4461 | return 0; |
| 4462 | } |
| 4463 | |
Li Zefan | 0eb253e | 2009-01-15 13:51:25 -0800 | [diff] [blame] | 4464 | static struct cgroup_subsys_state * __ref |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4465 | mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) |
| 4466 | { |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4467 | struct mem_cgroup *mem, *parent; |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4468 | long error = -ENOMEM; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4469 | int node; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4470 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 4471 | mem = mem_cgroup_alloc(); |
| 4472 | if (!mem) |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4473 | return ERR_PTR(error); |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 4474 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4475 | for_each_node_state(node, N_POSSIBLE) |
| 4476 | if (alloc_mem_cgroup_per_zone_info(mem, node)) |
| 4477 | goto free_out; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 4478 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 4479 | /* root ? */ |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4480 | if (cont->parent == NULL) { |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 4481 | int cpu; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 4482 | enable_swap_cgroup(); |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4483 | parent = NULL; |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 4484 | root_mem_cgroup = mem; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 4485 | if (mem_cgroup_soft_limit_tree_init()) |
| 4486 | goto free_out; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 4487 | for_each_possible_cpu(cpu) { |
| 4488 | struct memcg_stock_pcp *stock = |
| 4489 | &per_cpu(memcg_stock, cpu); |
| 4490 | INIT_WORK(&stock->work, drain_local_stock); |
| 4491 | } |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 4492 | hotcpu_notifier(memcg_cpu_hotplug_callback, 0); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4493 | } else { |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4494 | parent = mem_cgroup_from_cont(cont->parent); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4495 | mem->use_hierarchy = parent->use_hierarchy; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 4496 | mem->oom_kill_disable = parent->oom_kill_disable; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4497 | } |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4498 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4499 | if (parent && parent->use_hierarchy) { |
| 4500 | res_counter_init(&mem->res, &parent->res); |
| 4501 | res_counter_init(&mem->memsw, &parent->memsw); |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 4502 | /* |
| 4503 | * We increment refcnt of the parent to ensure that we can |
| 4504 | * safely access it on res_counter_charge/uncharge. |
| 4505 | * This refcnt will be decremented when freeing this |
| 4506 | * mem_cgroup(see mem_cgroup_put). |
| 4507 | */ |
| 4508 | mem_cgroup_get(parent); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4509 | } else { |
| 4510 | res_counter_init(&mem->res, NULL); |
| 4511 | res_counter_init(&mem->memsw, NULL); |
| 4512 | } |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4513 | mem->last_scanned_child = 0; |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4514 | INIT_LIST_HEAD(&mem->oom_notify); |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 4515 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 4516 | if (parent) |
| 4517 | mem->swappiness = get_swappiness(parent); |
KAMEZAWA Hiroyuki | a7ba0ee | 2009-01-07 18:08:32 -0800 | [diff] [blame] | 4518 | atomic_set(&mem->refcnt, 1); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4519 | mem->move_charge_at_immigrate = 0; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4520 | mutex_init(&mem->thresholds_lock); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4521 | return &mem->css; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4522 | free_out: |
KAMEZAWA Hiroyuki | a7ba0ee | 2009-01-07 18:08:32 -0800 | [diff] [blame] | 4523 | __mem_cgroup_free(mem); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 4524 | root_mem_cgroup = NULL; |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4525 | return ERR_PTR(error); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4526 | } |
| 4527 | |
KAMEZAWA Hiroyuki | ec64f51 | 2009-04-02 16:57:26 -0700 | [diff] [blame] | 4528 | static int mem_cgroup_pre_destroy(struct cgroup_subsys *ss, |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 4529 | struct cgroup *cont) |
| 4530 | { |
| 4531 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | ec64f51 | 2009-04-02 16:57:26 -0700 | [diff] [blame] | 4532 | |
| 4533 | return mem_cgroup_force_empty(mem, false); |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 4534 | } |
| 4535 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4536 | static void mem_cgroup_destroy(struct cgroup_subsys *ss, |
| 4537 | struct cgroup *cont) |
| 4538 | { |
Daisuke Nishimura | c268e99 | 2009-01-15 13:51:13 -0800 | [diff] [blame] | 4539 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
Daisuke Nishimura | c268e99 | 2009-01-15 13:51:13 -0800 | [diff] [blame] | 4540 | |
Daisuke Nishimura | c268e99 | 2009-01-15 13:51:13 -0800 | [diff] [blame] | 4541 | mem_cgroup_put(mem); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4542 | } |
| 4543 | |
| 4544 | static int mem_cgroup_populate(struct cgroup_subsys *ss, |
| 4545 | struct cgroup *cont) |
| 4546 | { |
KAMEZAWA Hiroyuki | 8c7c6e3 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4547 | int ret; |
| 4548 | |
| 4549 | ret = cgroup_add_files(cont, ss, mem_cgroup_files, |
| 4550 | ARRAY_SIZE(mem_cgroup_files)); |
| 4551 | |
| 4552 | if (!ret) |
| 4553 | ret = register_memsw_files(cont, ss); |
| 4554 | return ret; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4555 | } |
| 4556 | |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4557 | #ifdef CONFIG_MMU |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4558 | /* Handlers for move charge at task migration. */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4559 | #define PRECHARGE_COUNT_AT_ONCE 256 |
| 4560 | static int mem_cgroup_do_precharge(unsigned long count) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4561 | { |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4562 | int ret = 0; |
| 4563 | int batch_count = PRECHARGE_COUNT_AT_ONCE; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4564 | struct mem_cgroup *mem = mc.to; |
| 4565 | |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4566 | if (mem_cgroup_is_root(mem)) { |
| 4567 | mc.precharge += count; |
| 4568 | /* we don't need css_get for root */ |
| 4569 | return ret; |
| 4570 | } |
| 4571 | /* try to charge at once */ |
| 4572 | if (count > 1) { |
| 4573 | struct res_counter *dummy; |
| 4574 | /* |
| 4575 | * "mem" cannot be under rmdir() because we've already checked |
| 4576 | * by cgroup_lock_live_cgroup() that it is not removed and we |
| 4577 | * are still under the same cgroup_mutex. So we can postpone |
| 4578 | * css_get(). |
| 4579 | */ |
| 4580 | if (res_counter_charge(&mem->res, PAGE_SIZE * count, &dummy)) |
| 4581 | goto one_by_one; |
| 4582 | if (do_swap_account && res_counter_charge(&mem->memsw, |
| 4583 | PAGE_SIZE * count, &dummy)) { |
| 4584 | res_counter_uncharge(&mem->res, PAGE_SIZE * count); |
| 4585 | goto one_by_one; |
| 4586 | } |
| 4587 | mc.precharge += count; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4588 | return ret; |
| 4589 | } |
| 4590 | one_by_one: |
| 4591 | /* fall back to one by one charge */ |
| 4592 | while (count--) { |
| 4593 | if (signal_pending(current)) { |
| 4594 | ret = -EINTR; |
| 4595 | break; |
| 4596 | } |
| 4597 | if (!batch_count--) { |
| 4598 | batch_count = PRECHARGE_COUNT_AT_ONCE; |
| 4599 | cond_resched(); |
| 4600 | } |
Andrea Arcangeli | ec16851 | 2011-01-13 15:46:56 -0800 | [diff] [blame] | 4601 | ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false, |
| 4602 | PAGE_SIZE); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4603 | if (ret || !mem) |
| 4604 | /* mem_cgroup_clear_mc() will do uncharge later */ |
| 4605 | return -ENOMEM; |
| 4606 | mc.precharge++; |
| 4607 | } |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4608 | return ret; |
| 4609 | } |
| 4610 | |
| 4611 | /** |
| 4612 | * is_target_pte_for_mc - check a pte whether it is valid for move charge |
| 4613 | * @vma: the vma the pte to be checked belongs |
| 4614 | * @addr: the address corresponding to the pte to be checked |
| 4615 | * @ptent: the pte to be checked |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4616 | * @target: the pointer the target page or swap ent will be stored(can be NULL) |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4617 | * |
| 4618 | * Returns |
| 4619 | * 0(MC_TARGET_NONE): if the pte is not a target for move charge. |
| 4620 | * 1(MC_TARGET_PAGE): if the page corresponding to this pte is a target for |
| 4621 | * move charge. if @target is not NULL, the page is stored in target->page |
| 4622 | * with extra refcnt got(Callers should handle it). |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4623 | * 2(MC_TARGET_SWAP): if the swap entry corresponding to this pte is a |
| 4624 | * target for charge migration. if @target is not NULL, the entry is stored |
| 4625 | * in target->ent. |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4626 | * |
| 4627 | * Called with pte lock held. |
| 4628 | */ |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4629 | union mc_target { |
| 4630 | struct page *page; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4631 | swp_entry_t ent; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4632 | }; |
| 4633 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4634 | enum mc_target_type { |
| 4635 | MC_TARGET_NONE, /* not used */ |
| 4636 | MC_TARGET_PAGE, |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4637 | MC_TARGET_SWAP, |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4638 | }; |
| 4639 | |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4640 | static struct page *mc_handle_present_pte(struct vm_area_struct *vma, |
| 4641 | unsigned long addr, pte_t ptent) |
| 4642 | { |
| 4643 | struct page *page = vm_normal_page(vma, addr, ptent); |
| 4644 | |
| 4645 | if (!page || !page_mapped(page)) |
| 4646 | return NULL; |
| 4647 | if (PageAnon(page)) { |
| 4648 | /* we don't move shared anon */ |
| 4649 | if (!move_anon() || page_mapcount(page) > 2) |
| 4650 | return NULL; |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4651 | } else if (!move_file()) |
| 4652 | /* we ignore mapcount for file pages */ |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4653 | return NULL; |
| 4654 | if (!get_page_unless_zero(page)) |
| 4655 | return NULL; |
| 4656 | |
| 4657 | return page; |
| 4658 | } |
| 4659 | |
| 4660 | static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, |
| 4661 | unsigned long addr, pte_t ptent, swp_entry_t *entry) |
| 4662 | { |
| 4663 | int usage_count; |
| 4664 | struct page *page = NULL; |
| 4665 | swp_entry_t ent = pte_to_swp_entry(ptent); |
| 4666 | |
| 4667 | if (!move_anon() || non_swap_entry(ent)) |
| 4668 | return NULL; |
| 4669 | usage_count = mem_cgroup_count_swap_user(ent, &page); |
| 4670 | if (usage_count > 1) { /* we don't move shared anon */ |
| 4671 | if (page) |
| 4672 | put_page(page); |
| 4673 | return NULL; |
| 4674 | } |
| 4675 | if (do_swap_account) |
| 4676 | entry->val = ent.val; |
| 4677 | |
| 4678 | return page; |
| 4679 | } |
| 4680 | |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4681 | static struct page *mc_handle_file_pte(struct vm_area_struct *vma, |
| 4682 | unsigned long addr, pte_t ptent, swp_entry_t *entry) |
| 4683 | { |
| 4684 | struct page *page = NULL; |
| 4685 | struct inode *inode; |
| 4686 | struct address_space *mapping; |
| 4687 | pgoff_t pgoff; |
| 4688 | |
| 4689 | if (!vma->vm_file) /* anonymous vma */ |
| 4690 | return NULL; |
| 4691 | if (!move_file()) |
| 4692 | return NULL; |
| 4693 | |
| 4694 | inode = vma->vm_file->f_path.dentry->d_inode; |
| 4695 | mapping = vma->vm_file->f_mapping; |
| 4696 | if (pte_none(ptent)) |
| 4697 | pgoff = linear_page_index(vma, addr); |
| 4698 | else /* pte_file(ptent) is true */ |
| 4699 | pgoff = pte_to_pgoff(ptent); |
| 4700 | |
| 4701 | /* page is moved even if it's not RSS of this task(page-faulted). */ |
| 4702 | if (!mapping_cap_swap_backed(mapping)) { /* normal file */ |
| 4703 | page = find_get_page(mapping, pgoff); |
| 4704 | } else { /* shmem/tmpfs file. we should take account of swap too. */ |
| 4705 | swp_entry_t ent; |
| 4706 | mem_cgroup_get_shmem_target(inode, pgoff, &page, &ent); |
| 4707 | if (do_swap_account) |
| 4708 | entry->val = ent.val; |
| 4709 | } |
| 4710 | |
| 4711 | return page; |
| 4712 | } |
| 4713 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4714 | static int is_target_pte_for_mc(struct vm_area_struct *vma, |
| 4715 | unsigned long addr, pte_t ptent, union mc_target *target) |
| 4716 | { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4717 | struct page *page = NULL; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4718 | struct page_cgroup *pc; |
| 4719 | int ret = 0; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4720 | swp_entry_t ent = { .val = 0 }; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4721 | |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4722 | if (pte_present(ptent)) |
| 4723 | page = mc_handle_present_pte(vma, addr, ptent); |
| 4724 | else if (is_swap_pte(ptent)) |
| 4725 | page = mc_handle_swap_pte(vma, addr, ptent, &ent); |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4726 | else if (pte_none(ptent) || pte_file(ptent)) |
| 4727 | page = mc_handle_file_pte(vma, addr, ptent, &ent); |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4728 | |
| 4729 | if (!page && !ent.val) |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4730 | return 0; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4731 | if (page) { |
| 4732 | pc = lookup_page_cgroup(page); |
| 4733 | /* |
| 4734 | * Do only loose check w/o page_cgroup lock. |
| 4735 | * mem_cgroup_move_account() checks the pc is valid or not under |
| 4736 | * the lock. |
| 4737 | */ |
| 4738 | if (PageCgroupUsed(pc) && pc->mem_cgroup == mc.from) { |
| 4739 | ret = MC_TARGET_PAGE; |
| 4740 | if (target) |
| 4741 | target->page = page; |
| 4742 | } |
| 4743 | if (!ret || !target) |
| 4744 | put_page(page); |
| 4745 | } |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4746 | /* There is a swap entry and a page doesn't exist or isn't charged */ |
| 4747 | if (ent.val && !ret && |
KAMEZAWA Hiroyuki | 7f0f154 | 2010-05-11 14:06:58 -0700 | [diff] [blame] | 4748 | css_id(&mc.from->css) == lookup_swap_cgroup(ent)) { |
| 4749 | ret = MC_TARGET_SWAP; |
| 4750 | if (target) |
| 4751 | target->ent = ent; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4752 | } |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4753 | return ret; |
| 4754 | } |
| 4755 | |
| 4756 | static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd, |
| 4757 | unsigned long addr, unsigned long end, |
| 4758 | struct mm_walk *walk) |
| 4759 | { |
| 4760 | struct vm_area_struct *vma = walk->private; |
| 4761 | pte_t *pte; |
| 4762 | spinlock_t *ptl; |
| 4763 | |
Dave Hansen | 0331932 | 2011-03-22 16:32:56 -0700 | [diff] [blame] | 4764 | split_huge_page_pmd(walk->mm, pmd); |
| 4765 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4766 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
| 4767 | for (; addr != end; pte++, addr += PAGE_SIZE) |
| 4768 | if (is_target_pte_for_mc(vma, addr, *pte, NULL)) |
| 4769 | mc.precharge++; /* increment precharge temporarily */ |
| 4770 | pte_unmap_unlock(pte - 1, ptl); |
| 4771 | cond_resched(); |
| 4772 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4773 | return 0; |
| 4774 | } |
| 4775 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4776 | static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm) |
| 4777 | { |
| 4778 | unsigned long precharge; |
| 4779 | struct vm_area_struct *vma; |
| 4780 | |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4781 | down_read(&mm->mmap_sem); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4782 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
| 4783 | struct mm_walk mem_cgroup_count_precharge_walk = { |
| 4784 | .pmd_entry = mem_cgroup_count_precharge_pte_range, |
| 4785 | .mm = mm, |
| 4786 | .private = vma, |
| 4787 | }; |
| 4788 | if (is_vm_hugetlb_page(vma)) |
| 4789 | continue; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4790 | walk_page_range(vma->vm_start, vma->vm_end, |
| 4791 | &mem_cgroup_count_precharge_walk); |
| 4792 | } |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4793 | up_read(&mm->mmap_sem); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4794 | |
| 4795 | precharge = mc.precharge; |
| 4796 | mc.precharge = 0; |
| 4797 | |
| 4798 | return precharge; |
| 4799 | } |
| 4800 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4801 | static int mem_cgroup_precharge_mc(struct mm_struct *mm) |
| 4802 | { |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4803 | unsigned long precharge = mem_cgroup_count_precharge(mm); |
| 4804 | |
| 4805 | VM_BUG_ON(mc.moving_task); |
| 4806 | mc.moving_task = current; |
| 4807 | return mem_cgroup_do_precharge(precharge); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4808 | } |
| 4809 | |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4810 | /* cancels all extra charges on mc.from and mc.to, and wakes up all waiters. */ |
| 4811 | static void __mem_cgroup_clear_mc(void) |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4812 | { |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 4813 | struct mem_cgroup *from = mc.from; |
| 4814 | struct mem_cgroup *to = mc.to; |
| 4815 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4816 | /* we must uncharge all the leftover precharges from mc.to */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4817 | if (mc.precharge) { |
| 4818 | __mem_cgroup_cancel_charge(mc.to, mc.precharge); |
| 4819 | mc.precharge = 0; |
| 4820 | } |
| 4821 | /* |
| 4822 | * we didn't uncharge from mc.from at mem_cgroup_move_account(), so |
| 4823 | * we must uncharge here. |
| 4824 | */ |
| 4825 | if (mc.moved_charge) { |
| 4826 | __mem_cgroup_cancel_charge(mc.from, mc.moved_charge); |
| 4827 | mc.moved_charge = 0; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4828 | } |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4829 | /* we must fixup refcnts and charges */ |
| 4830 | if (mc.moved_swap) { |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4831 | /* uncharge swap account from the old cgroup */ |
| 4832 | if (!mem_cgroup_is_root(mc.from)) |
| 4833 | res_counter_uncharge(&mc.from->memsw, |
| 4834 | PAGE_SIZE * mc.moved_swap); |
| 4835 | __mem_cgroup_put(mc.from, mc.moved_swap); |
| 4836 | |
| 4837 | if (!mem_cgroup_is_root(mc.to)) { |
| 4838 | /* |
| 4839 | * we charged both to->res and to->memsw, so we should |
| 4840 | * uncharge to->res. |
| 4841 | */ |
| 4842 | res_counter_uncharge(&mc.to->res, |
| 4843 | PAGE_SIZE * mc.moved_swap); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4844 | } |
| 4845 | /* we've already done mem_cgroup_get(mc.to) */ |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4846 | mc.moved_swap = 0; |
| 4847 | } |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4848 | memcg_oom_recover(from); |
| 4849 | memcg_oom_recover(to); |
| 4850 | wake_up_all(&mc.waitq); |
| 4851 | } |
| 4852 | |
| 4853 | static void mem_cgroup_clear_mc(void) |
| 4854 | { |
| 4855 | struct mem_cgroup *from = mc.from; |
| 4856 | |
| 4857 | /* |
| 4858 | * we must clear moving_task before waking up waiters at the end of |
| 4859 | * task migration. |
| 4860 | */ |
| 4861 | mc.moving_task = NULL; |
| 4862 | __mem_cgroup_clear_mc(); |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 4863 | spin_lock(&mc.lock); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4864 | mc.from = NULL; |
| 4865 | mc.to = NULL; |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 4866 | spin_unlock(&mc.lock); |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 4867 | mem_cgroup_end_move(from); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4868 | } |
| 4869 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4870 | static int mem_cgroup_can_attach(struct cgroup_subsys *ss, |
| 4871 | struct cgroup *cgroup, |
| 4872 | struct task_struct *p, |
| 4873 | bool threadgroup) |
| 4874 | { |
| 4875 | int ret = 0; |
| 4876 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup); |
| 4877 | |
| 4878 | if (mem->move_charge_at_immigrate) { |
| 4879 | struct mm_struct *mm; |
| 4880 | struct mem_cgroup *from = mem_cgroup_from_task(p); |
| 4881 | |
| 4882 | VM_BUG_ON(from == mem); |
| 4883 | |
| 4884 | mm = get_task_mm(p); |
| 4885 | if (!mm) |
| 4886 | return 0; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4887 | /* We move charges only when we move a owner of the mm */ |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4888 | if (mm->owner == p) { |
| 4889 | VM_BUG_ON(mc.from); |
| 4890 | VM_BUG_ON(mc.to); |
| 4891 | VM_BUG_ON(mc.precharge); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4892 | VM_BUG_ON(mc.moved_charge); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4893 | VM_BUG_ON(mc.moved_swap); |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 4894 | mem_cgroup_start_move(from); |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 4895 | spin_lock(&mc.lock); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4896 | mc.from = from; |
| 4897 | mc.to = mem; |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 4898 | spin_unlock(&mc.lock); |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4899 | /* We set mc.moving_task later */ |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4900 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4901 | ret = mem_cgroup_precharge_mc(mm); |
| 4902 | if (ret) |
| 4903 | mem_cgroup_clear_mc(); |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4904 | } |
| 4905 | mmput(mm); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4906 | } |
| 4907 | return ret; |
| 4908 | } |
| 4909 | |
| 4910 | static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, |
| 4911 | struct cgroup *cgroup, |
| 4912 | struct task_struct *p, |
| 4913 | bool threadgroup) |
| 4914 | { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4915 | mem_cgroup_clear_mc(); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4916 | } |
| 4917 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4918 | static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, |
| 4919 | unsigned long addr, unsigned long end, |
| 4920 | struct mm_walk *walk) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4921 | { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4922 | int ret = 0; |
| 4923 | struct vm_area_struct *vma = walk->private; |
| 4924 | pte_t *pte; |
| 4925 | spinlock_t *ptl; |
| 4926 | |
Dave Hansen | 0331932 | 2011-03-22 16:32:56 -0700 | [diff] [blame] | 4927 | split_huge_page_pmd(walk->mm, pmd); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4928 | retry: |
| 4929 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
| 4930 | for (; addr != end; addr += PAGE_SIZE) { |
| 4931 | pte_t ptent = *(pte++); |
| 4932 | union mc_target target; |
| 4933 | int type; |
| 4934 | struct page *page; |
| 4935 | struct page_cgroup *pc; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4936 | swp_entry_t ent; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4937 | |
| 4938 | if (!mc.precharge) |
| 4939 | break; |
| 4940 | |
| 4941 | type = is_target_pte_for_mc(vma, addr, ptent, &target); |
| 4942 | switch (type) { |
| 4943 | case MC_TARGET_PAGE: |
| 4944 | page = target.page; |
| 4945 | if (isolate_lru_page(page)) |
| 4946 | goto put; |
| 4947 | pc = lookup_page_cgroup(page); |
Johannes Weiner | 5564e88 | 2011-03-23 16:42:29 -0700 | [diff] [blame] | 4948 | if (!mem_cgroup_move_account(page, pc, |
KAMEZAWA Hiroyuki | 987eba6 | 2011-01-20 14:44:25 -0800 | [diff] [blame] | 4949 | mc.from, mc.to, false, PAGE_SIZE)) { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4950 | mc.precharge--; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4951 | /* we uncharge from mc.from later. */ |
| 4952 | mc.moved_charge++; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4953 | } |
| 4954 | putback_lru_page(page); |
| 4955 | put: /* is_target_pte_for_mc() gets the page */ |
| 4956 | put_page(page); |
| 4957 | break; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4958 | case MC_TARGET_SWAP: |
| 4959 | ent = target.ent; |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4960 | if (!mem_cgroup_move_swap_account(ent, |
| 4961 | mc.from, mc.to, false)) { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4962 | mc.precharge--; |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4963 | /* we fixup refcnts and charges later. */ |
| 4964 | mc.moved_swap++; |
| 4965 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4966 | break; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4967 | default: |
| 4968 | break; |
| 4969 | } |
| 4970 | } |
| 4971 | pte_unmap_unlock(pte - 1, ptl); |
| 4972 | cond_resched(); |
| 4973 | |
| 4974 | if (addr != end) { |
| 4975 | /* |
| 4976 | * We have consumed all precharges we got in can_attach(). |
| 4977 | * We try charge one by one, but don't do any additional |
| 4978 | * charges to mc.to if we have failed in charge once in attach() |
| 4979 | * phase. |
| 4980 | */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4981 | ret = mem_cgroup_do_precharge(1); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4982 | if (!ret) |
| 4983 | goto retry; |
| 4984 | } |
| 4985 | |
| 4986 | return ret; |
| 4987 | } |
| 4988 | |
| 4989 | static void mem_cgroup_move_charge(struct mm_struct *mm) |
| 4990 | { |
| 4991 | struct vm_area_struct *vma; |
| 4992 | |
| 4993 | lru_add_drain_all(); |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4994 | retry: |
| 4995 | if (unlikely(!down_read_trylock(&mm->mmap_sem))) { |
| 4996 | /* |
| 4997 | * Someone who are holding the mmap_sem might be waiting in |
| 4998 | * waitq. So we cancel all extra charges, wake up all waiters, |
| 4999 | * and retry. Because we cancel precharges, we might not be able |
| 5000 | * to move enough charges, but moving charge is a best-effort |
| 5001 | * feature anyway, so it wouldn't be a big problem. |
| 5002 | */ |
| 5003 | __mem_cgroup_clear_mc(); |
| 5004 | cond_resched(); |
| 5005 | goto retry; |
| 5006 | } |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5007 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
| 5008 | int ret; |
| 5009 | struct mm_walk mem_cgroup_move_charge_walk = { |
| 5010 | .pmd_entry = mem_cgroup_move_charge_pte_range, |
| 5011 | .mm = mm, |
| 5012 | .private = vma, |
| 5013 | }; |
| 5014 | if (is_vm_hugetlb_page(vma)) |
| 5015 | continue; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5016 | ret = walk_page_range(vma->vm_start, vma->vm_end, |
| 5017 | &mem_cgroup_move_charge_walk); |
| 5018 | if (ret) |
| 5019 | /* |
| 5020 | * means we have consumed all precharges and failed in |
| 5021 | * doing additional charge. Just abandon here. |
| 5022 | */ |
| 5023 | break; |
| 5024 | } |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 5025 | up_read(&mm->mmap_sem); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 5026 | } |
| 5027 | |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 5028 | static void mem_cgroup_move_task(struct cgroup_subsys *ss, |
| 5029 | struct cgroup *cont, |
| 5030 | struct cgroup *old_cont, |
Ben Blum | be367d0 | 2009-09-23 15:56:31 -0700 | [diff] [blame] | 5031 | struct task_struct *p, |
| 5032 | bool threadgroup) |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 5033 | { |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 5034 | struct mm_struct *mm; |
| 5035 | |
| 5036 | if (!mc.to) |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5037 | /* no need to move charge */ |
| 5038 | return; |
| 5039 | |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 5040 | mm = get_task_mm(p); |
| 5041 | if (mm) { |
| 5042 | mem_cgroup_move_charge(mm); |
| 5043 | mmput(mm); |
| 5044 | } |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5045 | mem_cgroup_clear_mc(); |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 5046 | } |
Daisuke Nishimura | 5cfb80a | 2010-03-23 13:35:11 -0700 | [diff] [blame] | 5047 | #else /* !CONFIG_MMU */ |
| 5048 | static int mem_cgroup_can_attach(struct cgroup_subsys *ss, |
| 5049 | struct cgroup *cgroup, |
| 5050 | struct task_struct *p, |
| 5051 | bool threadgroup) |
| 5052 | { |
| 5053 | return 0; |
| 5054 | } |
| 5055 | static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, |
| 5056 | struct cgroup *cgroup, |
| 5057 | struct task_struct *p, |
| 5058 | bool threadgroup) |
| 5059 | { |
| 5060 | } |
| 5061 | static void mem_cgroup_move_task(struct cgroup_subsys *ss, |
| 5062 | struct cgroup *cont, |
| 5063 | struct cgroup *old_cont, |
| 5064 | struct task_struct *p, |
| 5065 | bool threadgroup) |
| 5066 | { |
| 5067 | } |
| 5068 | #endif |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 5069 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 5070 | struct cgroup_subsys mem_cgroup_subsys = { |
| 5071 | .name = "memory", |
| 5072 | .subsys_id = mem_cgroup_subsys_id, |
| 5073 | .create = mem_cgroup_create, |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 5074 | .pre_destroy = mem_cgroup_pre_destroy, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 5075 | .destroy = mem_cgroup_destroy, |
| 5076 | .populate = mem_cgroup_populate, |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 5077 | .can_attach = mem_cgroup_can_attach, |
| 5078 | .cancel_attach = mem_cgroup_cancel_attach, |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 5079 | .attach = mem_cgroup_move_task, |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 5080 | .early_init = 0, |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 5081 | .use_id = 1, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 5082 | }; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 5083 | |
| 5084 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
Michal Hocko | a42c390 | 2010-11-24 12:57:08 -0800 | [diff] [blame] | 5085 | static int __init enable_swap_account(char *s) |
| 5086 | { |
| 5087 | /* consider enabled if no parameter or 1 is given */ |
Michal Hocko | fceda1b | 2011-02-01 15:52:30 -0800 | [diff] [blame] | 5088 | if (!(*s) || !strcmp(s, "=1")) |
Michal Hocko | a42c390 | 2010-11-24 12:57:08 -0800 | [diff] [blame] | 5089 | really_do_swap_account = 1; |
Michal Hocko | fceda1b | 2011-02-01 15:52:30 -0800 | [diff] [blame] | 5090 | else if (!strcmp(s, "=0")) |
Michal Hocko | a42c390 | 2010-11-24 12:57:08 -0800 | [diff] [blame] | 5091 | really_do_swap_account = 0; |
| 5092 | return 1; |
| 5093 | } |
| 5094 | __setup("swapaccount", enable_swap_account); |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 5095 | |
| 5096 | static int __init disable_swap_account(char *s) |
| 5097 | { |
Michal Hocko | 552b372 | 2011-02-01 15:52:31 -0800 | [diff] [blame] | 5098 | printk_once("noswapaccount is deprecated and will be removed in 2.6.40. Use swapaccount=0 instead\n"); |
Michal Hocko | fceda1b | 2011-02-01 15:52:30 -0800 | [diff] [blame] | 5099 | enable_swap_account("=0"); |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 5100 | return 1; |
| 5101 | } |
| 5102 | __setup("noswapaccount", disable_swap_account); |
| 5103 | #endif |