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 | 8c7c6e34 | 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 | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 50 | #include "internal.h" |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 51 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 52 | #include <asm/uaccess.h> |
| 53 | |
KAMEZAWA Hiroyuki | a181b0e | 2008-07-25 01:47:08 -0700 | [diff] [blame] | 54 | struct cgroup_subsys mem_cgroup_subsys __read_mostly; |
KAMEZAWA Hiroyuki | a181b0e | 2008-07-25 01:47:08 -0700 | [diff] [blame] | 55 | #define MEM_CGROUP_RECLAIM_RETRIES 5 |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 56 | struct mem_cgroup *root_mem_cgroup __read_mostly; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 57 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 58 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
Li Zefan | 338c843 | 2009-06-17 16:27:15 -0700 | [diff] [blame] | 59 | /* 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] | 60 | int do_swap_account __read_mostly; |
| 61 | static int really_do_swap_account __initdata = 1; /* for remember boot option*/ |
| 62 | #else |
| 63 | #define do_swap_account (0) |
| 64 | #endif |
| 65 | |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 66 | /* |
| 67 | * Per memcg event counter is incremented at every pagein/pageout. This counter |
| 68 | * is used for trigger some periodic events. This is straightforward and better |
| 69 | * than using jiffies etc. to handle periodic memcg event. |
| 70 | * |
| 71 | * These values will be used as !((event) & ((1 <<(thresh)) - 1)) |
| 72 | */ |
| 73 | #define THRESHOLDS_EVENTS_THRESH (7) /* once in 128 */ |
| 74 | #define SOFTLIMIT_EVENTS_THRESH (10) /* once in 1024 */ |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 75 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 76 | /* |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 77 | * Statistics for memory cgroup. |
| 78 | */ |
| 79 | enum mem_cgroup_stat_index { |
| 80 | /* |
| 81 | * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. |
| 82 | */ |
| 83 | MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 84 | MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */ |
KAMEZAWA Hiroyuki | d804658 | 2009-12-15 16:47:09 -0800 | [diff] [blame] | 85 | MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */ |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 86 | MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */ |
| 87 | MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */ |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 88 | MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */ |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 89 | MEM_CGROUP_EVENTS, /* incremented at every pagein/pageout */ |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 90 | |
| 91 | MEM_CGROUP_STAT_NSTATS, |
| 92 | }; |
| 93 | |
| 94 | struct mem_cgroup_stat_cpu { |
| 95 | s64 count[MEM_CGROUP_STAT_NSTATS]; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 96 | }; |
| 97 | |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 98 | /* |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 99 | * per-zone information in memory controller. |
| 100 | */ |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 101 | struct mem_cgroup_per_zone { |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 102 | /* |
| 103 | * spin_lock to protect the per cgroup LRU |
| 104 | */ |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 105 | struct list_head lists[NR_LRU_LISTS]; |
| 106 | unsigned long count[NR_LRU_LISTS]; |
KOSAKI Motohiro | 3e2f41f | 2009-01-07 18:08:20 -0800 | [diff] [blame] | 107 | |
| 108 | struct zone_reclaim_stat reclaim_stat; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 109 | struct rb_node tree_node; /* RB tree node */ |
| 110 | unsigned long long usage_in_excess;/* Set to the value by which */ |
| 111 | /* the soft limit is exceeded*/ |
| 112 | bool on_tree; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 113 | struct mem_cgroup *mem; /* Back pointer, we cannot */ |
| 114 | /* use container_of */ |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 115 | }; |
| 116 | /* Macro for accessing counter */ |
| 117 | #define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)]) |
| 118 | |
| 119 | struct mem_cgroup_per_node { |
| 120 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; |
| 121 | }; |
| 122 | |
| 123 | struct mem_cgroup_lru_info { |
| 124 | struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES]; |
| 125 | }; |
| 126 | |
| 127 | /* |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 128 | * Cgroups above their limits are maintained in a RB-Tree, independent of |
| 129 | * their hierarchy representation |
| 130 | */ |
| 131 | |
| 132 | struct mem_cgroup_tree_per_zone { |
| 133 | struct rb_root rb_root; |
| 134 | spinlock_t lock; |
| 135 | }; |
| 136 | |
| 137 | struct mem_cgroup_tree_per_node { |
| 138 | struct mem_cgroup_tree_per_zone rb_tree_per_zone[MAX_NR_ZONES]; |
| 139 | }; |
| 140 | |
| 141 | struct mem_cgroup_tree { |
| 142 | struct mem_cgroup_tree_per_node *rb_tree_per_node[MAX_NUMNODES]; |
| 143 | }; |
| 144 | |
| 145 | static struct mem_cgroup_tree soft_limit_tree __read_mostly; |
| 146 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 147 | struct mem_cgroup_threshold { |
| 148 | struct eventfd_ctx *eventfd; |
| 149 | u64 threshold; |
| 150 | }; |
| 151 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 152 | /* For threshold */ |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 153 | struct mem_cgroup_threshold_ary { |
| 154 | /* An array index points to threshold just below usage. */ |
Phil Carmody | 5407a56 | 2010-05-26 14:42:42 -0700 | [diff] [blame] | 155 | int current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 156 | /* Size of entries[] */ |
| 157 | unsigned int size; |
| 158 | /* Array of thresholds */ |
| 159 | struct mem_cgroup_threshold entries[0]; |
| 160 | }; |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 161 | |
| 162 | struct mem_cgroup_thresholds { |
| 163 | /* Primary thresholds array */ |
| 164 | struct mem_cgroup_threshold_ary *primary; |
| 165 | /* |
| 166 | * Spare threshold array. |
| 167 | * This is needed to make mem_cgroup_unregister_event() "never fail". |
| 168 | * It must be able to store at least primary->size - 1 entries. |
| 169 | */ |
| 170 | struct mem_cgroup_threshold_ary *spare; |
| 171 | }; |
| 172 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 173 | /* for OOM */ |
| 174 | struct mem_cgroup_eventfd_list { |
| 175 | struct list_head list; |
| 176 | struct eventfd_ctx *eventfd; |
| 177 | }; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 178 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 179 | static void mem_cgroup_threshold(struct mem_cgroup *mem); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 180 | static void mem_cgroup_oom_notify(struct mem_cgroup *mem); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 181 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 182 | /* |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 183 | * The memory controller data structure. The memory controller controls both |
| 184 | * page cache and RSS per cgroup. We would eventually like to provide |
| 185 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, |
| 186 | * to help the administrator determine what knobs to tune. |
| 187 | * |
| 188 | * 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] | 189 | * we hit the water mark. May be even add a low water mark, such that |
| 190 | * no reclaim occurs from a cgroup at it's low water mark, this is |
| 191 | * a feature that will be implemented much later in the future. |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 192 | */ |
| 193 | struct mem_cgroup { |
| 194 | struct cgroup_subsys_state css; |
| 195 | /* |
| 196 | * the counter to account for memory usage |
| 197 | */ |
| 198 | struct res_counter res; |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 199 | /* |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 200 | * the counter to account for mem+swap usage. |
| 201 | */ |
| 202 | struct res_counter memsw; |
| 203 | /* |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 204 | * Per cgroup active and inactive list, similar to the |
| 205 | * per zone LRU lists. |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 206 | */ |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 207 | struct mem_cgroup_lru_info info; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 208 | |
KOSAKI Motohiro | 2733c06 | 2009-01-07 18:08:23 -0800 | [diff] [blame] | 209 | /* |
| 210 | protect against reclaim related member. |
| 211 | */ |
| 212 | spinlock_t reclaim_param_lock; |
| 213 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 214 | /* |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 215 | * While reclaiming in a hierarchy, we cache the last child we |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 216 | * reclaimed from. |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 217 | */ |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 218 | int last_scanned_child; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 219 | /* |
| 220 | * Should the accounting and control be hierarchical, per subtree? |
| 221 | */ |
| 222 | bool use_hierarchy; |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 223 | atomic_t oom_lock; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 224 | atomic_t refcnt; |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 225 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 226 | unsigned int swappiness; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 227 | /* OOM-Killer disable */ |
| 228 | int oom_kill_disable; |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 229 | |
KAMEZAWA Hiroyuki | 22a668d | 2009-06-17 16:27:19 -0700 | [diff] [blame] | 230 | /* set when res.limit == memsw.limit */ |
| 231 | bool memsw_is_minimum; |
| 232 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 233 | /* protect arrays of thresholds */ |
| 234 | struct mutex thresholds_lock; |
| 235 | |
| 236 | /* thresholds for memory usage. RCU-protected */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 237 | struct mem_cgroup_thresholds thresholds; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 238 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 239 | /* thresholds for mem+swap usage. RCU-protected */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 240 | struct mem_cgroup_thresholds memsw_thresholds; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 241 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 242 | /* For oom notifier event fd */ |
| 243 | struct list_head oom_notify; |
| 244 | |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 245 | /* |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 246 | * Should we move charges of a task when a task is moved into this |
| 247 | * mem_cgroup ? And what type of charges should we move ? |
| 248 | */ |
| 249 | unsigned long move_charge_at_immigrate; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 250 | /* |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 251 | * percpu counter. |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 252 | */ |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 253 | struct mem_cgroup_stat_cpu *stat; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 254 | }; |
| 255 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 256 | /* Stuffs for move charges at task migration. */ |
| 257 | /* |
| 258 | * Types of charges to be moved. "move_charge_at_immitgrate" is treated as a |
| 259 | * left-shifted bitmap of these types. |
| 260 | */ |
| 261 | enum move_type { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 262 | MOVE_CHARGE_TYPE_ANON, /* private anonymous page and swap of it */ |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 263 | MOVE_CHARGE_TYPE_FILE, /* file page(including tmpfs) and swap of it */ |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 264 | NR_MOVE_TYPE, |
| 265 | }; |
| 266 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 267 | /* "mc" and its members are protected by cgroup_mutex */ |
| 268 | static struct move_charge_struct { |
| 269 | struct mem_cgroup *from; |
| 270 | struct mem_cgroup *to; |
| 271 | unsigned long precharge; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 272 | unsigned long moved_charge; |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 273 | unsigned long moved_swap; |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 274 | struct task_struct *moving_task; /* a task moving charges */ |
| 275 | wait_queue_head_t waitq; /* a waitq for other context */ |
| 276 | } mc = { |
| 277 | .waitq = __WAIT_QUEUE_HEAD_INITIALIZER(mc.waitq), |
| 278 | }; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 279 | |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 280 | static bool move_anon(void) |
| 281 | { |
| 282 | return test_bit(MOVE_CHARGE_TYPE_ANON, |
| 283 | &mc.to->move_charge_at_immigrate); |
| 284 | } |
| 285 | |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 286 | static bool move_file(void) |
| 287 | { |
| 288 | return test_bit(MOVE_CHARGE_TYPE_FILE, |
| 289 | &mc.to->move_charge_at_immigrate); |
| 290 | } |
| 291 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 292 | /* |
| 293 | * Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft |
| 294 | * limit reclaim to prevent infinite loops, if they ever occur. |
| 295 | */ |
| 296 | #define MEM_CGROUP_MAX_RECLAIM_LOOPS (100) |
| 297 | #define MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS (2) |
| 298 | |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 299 | enum charge_type { |
| 300 | MEM_CGROUP_CHARGE_TYPE_CACHE = 0, |
| 301 | MEM_CGROUP_CHARGE_TYPE_MAPPED, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 302 | MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */ |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 303 | MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */ |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 304 | MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */ |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 305 | MEM_CGROUP_CHARGE_TYPE_DROP, /* a page was unused swap cache */ |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 306 | NR_CHARGE_TYPE, |
| 307 | }; |
| 308 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 309 | /* only for here (for easy reading.) */ |
| 310 | #define PCGF_CACHE (1UL << PCG_CACHE) |
| 311 | #define PCGF_USED (1UL << PCG_USED) |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 312 | #define PCGF_LOCK (1UL << PCG_LOCK) |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 313 | /* Not used, but added here for completeness */ |
| 314 | #define PCGF_ACCT (1UL << PCG_ACCT) |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 315 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 316 | /* for encoding cft->private value on file */ |
| 317 | #define _MEM (0) |
| 318 | #define _MEMSWAP (1) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 319 | #define _OOM_TYPE (2) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 320 | #define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
| 321 | #define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff) |
| 322 | #define MEMFILE_ATTR(val) ((val) & 0xffff) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 323 | /* Used for OOM nofiier */ |
| 324 | #define OOM_CONTROL (0) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 325 | |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 326 | /* |
| 327 | * Reclaim flags for mem_cgroup_hierarchical_reclaim |
| 328 | */ |
| 329 | #define MEM_CGROUP_RECLAIM_NOSWAP_BIT 0x0 |
| 330 | #define MEM_CGROUP_RECLAIM_NOSWAP (1 << MEM_CGROUP_RECLAIM_NOSWAP_BIT) |
| 331 | #define MEM_CGROUP_RECLAIM_SHRINK_BIT 0x1 |
| 332 | #define MEM_CGROUP_RECLAIM_SHRINK (1 << MEM_CGROUP_RECLAIM_SHRINK_BIT) |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 333 | #define MEM_CGROUP_RECLAIM_SOFT_BIT 0x2 |
| 334 | #define MEM_CGROUP_RECLAIM_SOFT (1 << MEM_CGROUP_RECLAIM_SOFT_BIT) |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 335 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 336 | static void mem_cgroup_get(struct mem_cgroup *mem); |
| 337 | static void mem_cgroup_put(struct mem_cgroup *mem); |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 338 | static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 339 | static void drain_all_stock_async(void); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 340 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 341 | static struct mem_cgroup_per_zone * |
| 342 | mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid) |
| 343 | { |
| 344 | return &mem->info.nodeinfo[nid]->zoneinfo[zid]; |
| 345 | } |
| 346 | |
Wu Fengguang | d324236 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 347 | struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem) |
| 348 | { |
| 349 | return &mem->css; |
| 350 | } |
| 351 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 352 | static struct mem_cgroup_per_zone * |
| 353 | page_cgroup_zoneinfo(struct page_cgroup *pc) |
| 354 | { |
| 355 | struct mem_cgroup *mem = pc->mem_cgroup; |
| 356 | int nid = page_cgroup_nid(pc); |
| 357 | int zid = page_cgroup_zid(pc); |
| 358 | |
| 359 | if (!mem) |
| 360 | return NULL; |
| 361 | |
| 362 | return mem_cgroup_zoneinfo(mem, nid, zid); |
| 363 | } |
| 364 | |
| 365 | static struct mem_cgroup_tree_per_zone * |
| 366 | soft_limit_tree_node_zone(int nid, int zid) |
| 367 | { |
| 368 | return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid]; |
| 369 | } |
| 370 | |
| 371 | static struct mem_cgroup_tree_per_zone * |
| 372 | soft_limit_tree_from_page(struct page *page) |
| 373 | { |
| 374 | int nid = page_to_nid(page); |
| 375 | int zid = page_zonenum(page); |
| 376 | |
| 377 | return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid]; |
| 378 | } |
| 379 | |
| 380 | static void |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 381 | __mem_cgroup_insert_exceeded(struct mem_cgroup *mem, |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 382 | struct mem_cgroup_per_zone *mz, |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 383 | struct mem_cgroup_tree_per_zone *mctz, |
| 384 | unsigned long long new_usage_in_excess) |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 385 | { |
| 386 | struct rb_node **p = &mctz->rb_root.rb_node; |
| 387 | struct rb_node *parent = NULL; |
| 388 | struct mem_cgroup_per_zone *mz_node; |
| 389 | |
| 390 | if (mz->on_tree) |
| 391 | return; |
| 392 | |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 393 | mz->usage_in_excess = new_usage_in_excess; |
| 394 | if (!mz->usage_in_excess) |
| 395 | return; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 396 | while (*p) { |
| 397 | parent = *p; |
| 398 | mz_node = rb_entry(parent, struct mem_cgroup_per_zone, |
| 399 | tree_node); |
| 400 | if (mz->usage_in_excess < mz_node->usage_in_excess) |
| 401 | p = &(*p)->rb_left; |
| 402 | /* |
| 403 | * We can't avoid mem cgroups that are over their soft |
| 404 | * limit by the same amount |
| 405 | */ |
| 406 | else if (mz->usage_in_excess >= mz_node->usage_in_excess) |
| 407 | p = &(*p)->rb_right; |
| 408 | } |
| 409 | rb_link_node(&mz->tree_node, parent, p); |
| 410 | rb_insert_color(&mz->tree_node, &mctz->rb_root); |
| 411 | mz->on_tree = true; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | static void |
| 415 | __mem_cgroup_remove_exceeded(struct mem_cgroup *mem, |
| 416 | struct mem_cgroup_per_zone *mz, |
| 417 | struct mem_cgroup_tree_per_zone *mctz) |
| 418 | { |
| 419 | if (!mz->on_tree) |
| 420 | return; |
| 421 | rb_erase(&mz->tree_node, &mctz->rb_root); |
| 422 | mz->on_tree = false; |
| 423 | } |
| 424 | |
| 425 | static void |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 426 | mem_cgroup_remove_exceeded(struct mem_cgroup *mem, |
| 427 | struct mem_cgroup_per_zone *mz, |
| 428 | struct mem_cgroup_tree_per_zone *mctz) |
| 429 | { |
| 430 | spin_lock(&mctz->lock); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 431 | __mem_cgroup_remove_exceeded(mem, mz, mctz); |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 432 | spin_unlock(&mctz->lock); |
| 433 | } |
| 434 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 435 | |
| 436 | static void mem_cgroup_update_tree(struct mem_cgroup *mem, struct page *page) |
| 437 | { |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 438 | unsigned long long excess; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 439 | struct mem_cgroup_per_zone *mz; |
| 440 | struct mem_cgroup_tree_per_zone *mctz; |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 441 | int nid = page_to_nid(page); |
| 442 | int zid = page_zonenum(page); |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 443 | mctz = soft_limit_tree_from_page(page); |
| 444 | |
| 445 | /* |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 446 | * Necessary to update all ancestors when hierarchy is used. |
| 447 | * because their event counter is not touched. |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 448 | */ |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 449 | for (; mem; mem = parent_mem_cgroup(mem)) { |
| 450 | mz = mem_cgroup_zoneinfo(mem, nid, zid); |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 451 | excess = res_counter_soft_limit_excess(&mem->res); |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 452 | /* |
| 453 | * We have to update the tree if mz is on RB-tree or |
| 454 | * mem is over its softlimit. |
| 455 | */ |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 456 | if (excess || mz->on_tree) { |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 457 | spin_lock(&mctz->lock); |
| 458 | /* if on-tree, remove it */ |
| 459 | if (mz->on_tree) |
| 460 | __mem_cgroup_remove_exceeded(mem, mz, mctz); |
| 461 | /* |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 462 | * Insert again. mz->usage_in_excess will be updated. |
| 463 | * If excess is 0, no tree ops. |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 464 | */ |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 465 | __mem_cgroup_insert_exceeded(mem, mz, mctz, excess); |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 466 | spin_unlock(&mctz->lock); |
| 467 | } |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 468 | } |
| 469 | } |
| 470 | |
| 471 | static void mem_cgroup_remove_from_trees(struct mem_cgroup *mem) |
| 472 | { |
| 473 | int node, zone; |
| 474 | struct mem_cgroup_per_zone *mz; |
| 475 | struct mem_cgroup_tree_per_zone *mctz; |
| 476 | |
| 477 | for_each_node_state(node, N_POSSIBLE) { |
| 478 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { |
| 479 | mz = mem_cgroup_zoneinfo(mem, node, zone); |
| 480 | mctz = soft_limit_tree_node_zone(node, zone); |
| 481 | mem_cgroup_remove_exceeded(mem, mz, mctz); |
| 482 | } |
| 483 | } |
| 484 | } |
| 485 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 486 | static inline unsigned long mem_cgroup_get_excess(struct mem_cgroup *mem) |
| 487 | { |
| 488 | return res_counter_soft_limit_excess(&mem->res) >> PAGE_SHIFT; |
| 489 | } |
| 490 | |
| 491 | static struct mem_cgroup_per_zone * |
| 492 | __mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz) |
| 493 | { |
| 494 | struct rb_node *rightmost = NULL; |
KAMEZAWA Hiroyuki | 26251ea | 2009-10-01 15:44:08 -0700 | [diff] [blame] | 495 | struct mem_cgroup_per_zone *mz; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 496 | |
| 497 | retry: |
KAMEZAWA Hiroyuki | 26251ea | 2009-10-01 15:44:08 -0700 | [diff] [blame] | 498 | mz = NULL; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 499 | rightmost = rb_last(&mctz->rb_root); |
| 500 | if (!rightmost) |
| 501 | goto done; /* Nothing to reclaim from */ |
| 502 | |
| 503 | mz = rb_entry(rightmost, struct mem_cgroup_per_zone, tree_node); |
| 504 | /* |
| 505 | * Remove the node now but someone else can add it back, |
| 506 | * we will to add it back at the end of reclaim to its correct |
| 507 | * position in the tree. |
| 508 | */ |
| 509 | __mem_cgroup_remove_exceeded(mz->mem, mz, mctz); |
| 510 | if (!res_counter_soft_limit_excess(&mz->mem->res) || |
| 511 | !css_tryget(&mz->mem->css)) |
| 512 | goto retry; |
| 513 | done: |
| 514 | return mz; |
| 515 | } |
| 516 | |
| 517 | static struct mem_cgroup_per_zone * |
| 518 | mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz) |
| 519 | { |
| 520 | struct mem_cgroup_per_zone *mz; |
| 521 | |
| 522 | spin_lock(&mctz->lock); |
| 523 | mz = __mem_cgroup_largest_soft_limit_node(mctz); |
| 524 | spin_unlock(&mctz->lock); |
| 525 | return mz; |
| 526 | } |
| 527 | |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 528 | static s64 mem_cgroup_read_stat(struct mem_cgroup *mem, |
| 529 | enum mem_cgroup_stat_index idx) |
| 530 | { |
| 531 | int cpu; |
| 532 | s64 val = 0; |
| 533 | |
| 534 | for_each_possible_cpu(cpu) |
| 535 | val += per_cpu(mem->stat->count[idx], cpu); |
| 536 | return val; |
| 537 | } |
| 538 | |
| 539 | static s64 mem_cgroup_local_usage(struct mem_cgroup *mem) |
| 540 | { |
| 541 | s64 ret; |
| 542 | |
| 543 | ret = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS); |
| 544 | ret += mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE); |
| 545 | return ret; |
| 546 | } |
| 547 | |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 548 | static void mem_cgroup_swap_statistics(struct mem_cgroup *mem, |
| 549 | bool charge) |
| 550 | { |
| 551 | int val = (charge) ? 1 : -1; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 552 | this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_SWAPOUT], val); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 553 | } |
| 554 | |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 555 | static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, |
| 556 | struct page_cgroup *pc, |
| 557 | bool charge) |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 558 | { |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 559 | int val = (charge) ? 1 : -1; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 560 | |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 561 | preempt_disable(); |
| 562 | |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 563 | if (PageCgroupCache(pc)) |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 564 | __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_CACHE], val); |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 565 | else |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 566 | __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_RSS], val); |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 567 | |
| 568 | if (charge) |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 569 | __this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGIN_COUNT]); |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 570 | else |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 571 | __this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGOUT_COUNT]); |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 572 | __this_cpu_inc(mem->stat->count[MEM_CGROUP_EVENTS]); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 573 | |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 574 | preempt_enable(); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 575 | } |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 576 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 577 | static unsigned long mem_cgroup_get_local_zonestat(struct mem_cgroup *mem, |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 578 | enum lru_list idx) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 579 | { |
| 580 | int nid, zid; |
| 581 | struct mem_cgroup_per_zone *mz; |
| 582 | u64 total = 0; |
| 583 | |
| 584 | for_each_online_node(nid) |
| 585 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { |
| 586 | mz = mem_cgroup_zoneinfo(mem, nid, zid); |
| 587 | total += MEM_CGROUP_ZSTAT(mz, idx); |
| 588 | } |
| 589 | return total; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 590 | } |
| 591 | |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 592 | static bool __memcg_event_check(struct mem_cgroup *mem, int event_mask_shift) |
| 593 | { |
| 594 | s64 val; |
| 595 | |
| 596 | val = this_cpu_read(mem->stat->count[MEM_CGROUP_EVENTS]); |
| 597 | |
| 598 | return !(val & ((1 << event_mask_shift) - 1)); |
| 599 | } |
| 600 | |
| 601 | /* |
| 602 | * Check events in order. |
| 603 | * |
| 604 | */ |
| 605 | static void memcg_check_events(struct mem_cgroup *mem, struct page *page) |
| 606 | { |
| 607 | /* threshold event is triggered in finer grain than soft limit */ |
| 608 | if (unlikely(__memcg_event_check(mem, THRESHOLDS_EVENTS_THRESH))) { |
| 609 | mem_cgroup_threshold(mem); |
| 610 | if (unlikely(__memcg_event_check(mem, SOFTLIMIT_EVENTS_THRESH))) |
| 611 | mem_cgroup_update_tree(mem, page); |
| 612 | } |
| 613 | } |
| 614 | |
Hugh Dickins | d5b69e3 | 2008-03-04 14:29:10 -0800 | [diff] [blame] | 615 | static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 616 | { |
| 617 | return container_of(cgroup_subsys_state(cont, |
| 618 | mem_cgroup_subsys_id), struct mem_cgroup, |
| 619 | css); |
| 620 | } |
| 621 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 622 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 623 | { |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 624 | /* |
| 625 | * mm_update_next_owner() may clear mm->owner to NULL |
| 626 | * if it races with swapoff, page migration, etc. |
| 627 | * So this can be called with p == NULL. |
| 628 | */ |
| 629 | if (unlikely(!p)) |
| 630 | return NULL; |
| 631 | |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 632 | return container_of(task_subsys_state(p, mem_cgroup_subsys_id), |
| 633 | struct mem_cgroup, css); |
| 634 | } |
| 635 | |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 636 | static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm) |
| 637 | { |
| 638 | struct mem_cgroup *mem = NULL; |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 639 | |
| 640 | if (!mm) |
| 641 | return NULL; |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 642 | /* |
| 643 | * Because we have no locks, mm->owner's may be being moved to other |
| 644 | * cgroup. We use css_tryget() here even if this looks |
| 645 | * pessimistic (rather than adding locks here). |
| 646 | */ |
| 647 | rcu_read_lock(); |
| 648 | do { |
| 649 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
| 650 | if (unlikely(!mem)) |
| 651 | break; |
| 652 | } while (!css_tryget(&mem->css)); |
| 653 | rcu_read_unlock(); |
| 654 | return mem; |
| 655 | } |
| 656 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 657 | /* |
| 658 | * Call callback function against all cgroup under hierarchy tree. |
| 659 | */ |
| 660 | static int mem_cgroup_walk_tree(struct mem_cgroup *root, void *data, |
| 661 | int (*func)(struct mem_cgroup *, void *)) |
| 662 | { |
| 663 | int found, ret, nextid; |
| 664 | struct cgroup_subsys_state *css; |
| 665 | struct mem_cgroup *mem; |
| 666 | |
| 667 | if (!root->use_hierarchy) |
| 668 | return (*func)(root, data); |
| 669 | |
| 670 | nextid = 1; |
| 671 | do { |
| 672 | ret = 0; |
| 673 | mem = NULL; |
| 674 | |
| 675 | rcu_read_lock(); |
| 676 | css = css_get_next(&mem_cgroup_subsys, nextid, &root->css, |
| 677 | &found); |
| 678 | if (css && css_tryget(css)) |
| 679 | mem = container_of(css, struct mem_cgroup, css); |
| 680 | rcu_read_unlock(); |
| 681 | |
| 682 | if (mem) { |
| 683 | ret = (*func)(mem, data); |
| 684 | css_put(&mem->css); |
| 685 | } |
| 686 | nextid = found + 1; |
| 687 | } while (!ret && css); |
| 688 | |
| 689 | return ret; |
| 690 | } |
| 691 | |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 692 | static inline bool mem_cgroup_is_root(struct mem_cgroup *mem) |
| 693 | { |
| 694 | return (mem == root_mem_cgroup); |
| 695 | } |
| 696 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 697 | /* |
| 698 | * Following LRU functions are allowed to be used without PCG_LOCK. |
| 699 | * Operations are called by routine of global LRU independently from memcg. |
| 700 | * What we have to take care of here is validness of pc->mem_cgroup. |
| 701 | * |
| 702 | * Changes to pc->mem_cgroup happens when |
| 703 | * 1. charge |
| 704 | * 2. moving account |
| 705 | * In typical case, "charge" is done before add-to-lru. Exception is SwapCache. |
| 706 | * It is added to LRU before charge. |
| 707 | * If PCG_USED bit is not set, page_cgroup is not added to this private LRU. |
| 708 | * When moving account, the page is not on LRU. It's isolated. |
| 709 | */ |
| 710 | |
| 711 | 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] | 712 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 713 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 714 | struct mem_cgroup_per_zone *mz; |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 715 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 716 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 717 | return; |
| 718 | pc = lookup_page_cgroup(page); |
| 719 | /* can happen while we handle swapcache. */ |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 720 | if (!TestClearPageCgroupAcctLRU(pc)) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 721 | return; |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 722 | VM_BUG_ON(!pc->mem_cgroup); |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 723 | /* |
| 724 | * We don't check PCG_USED bit. It's cleared when the "page" is finally |
| 725 | * removed from global LRU. |
| 726 | */ |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 727 | mz = page_cgroup_zoneinfo(pc); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 728 | MEM_CGROUP_ZSTAT(mz, lru) -= 1; |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 729 | if (mem_cgroup_is_root(pc->mem_cgroup)) |
| 730 | return; |
| 731 | VM_BUG_ON(list_empty(&pc->lru)); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 732 | list_del_init(&pc->lru); |
| 733 | return; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 734 | } |
| 735 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 736 | void mem_cgroup_del_lru(struct page *page) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 737 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 738 | mem_cgroup_del_lru_list(page, page_lru(page)); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 739 | } |
| 740 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 741 | 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] | 742 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 743 | struct mem_cgroup_per_zone *mz; |
| 744 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 745 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 746 | if (mem_cgroup_disabled()) |
Lee Schermerhorn | 894bc31 | 2008-10-18 20:26:39 -0700 | [diff] [blame] | 747 | return; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 748 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 749 | pc = lookup_page_cgroup(page); |
Daisuke Nishimura | bd112db | 2009-01-15 13:51:11 -0800 | [diff] [blame] | 750 | /* |
| 751 | * Used bit is set without atomic ops but after smp_wmb(). |
| 752 | * For making pc->mem_cgroup visible, insert smp_rmb() here. |
| 753 | */ |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 754 | smp_rmb(); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 755 | /* unused or root page is not rotated. */ |
| 756 | if (!PageCgroupUsed(pc) || mem_cgroup_is_root(pc->mem_cgroup)) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 757 | return; |
| 758 | mz = page_cgroup_zoneinfo(pc); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 759 | list_move(&pc->lru, &mz->lists[lru]); |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 760 | } |
| 761 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 762 | void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru) |
| 763 | { |
| 764 | struct page_cgroup *pc; |
| 765 | struct mem_cgroup_per_zone *mz; |
| 766 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 767 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 768 | return; |
| 769 | pc = lookup_page_cgroup(page); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 770 | VM_BUG_ON(PageCgroupAcctLRU(pc)); |
Daisuke Nishimura | bd112db | 2009-01-15 13:51:11 -0800 | [diff] [blame] | 771 | /* |
| 772 | * Used bit is set without atomic ops but after smp_wmb(). |
| 773 | * For making pc->mem_cgroup visible, insert smp_rmb() here. |
| 774 | */ |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 775 | smp_rmb(); |
| 776 | if (!PageCgroupUsed(pc)) |
| 777 | return; |
| 778 | |
| 779 | mz = page_cgroup_zoneinfo(pc); |
| 780 | MEM_CGROUP_ZSTAT(mz, lru) += 1; |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 781 | SetPageCgroupAcctLRU(pc); |
| 782 | if (mem_cgroup_is_root(pc->mem_cgroup)) |
| 783 | return; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 784 | list_add(&pc->lru, &mz->lists[lru]); |
| 785 | } |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 786 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 787 | /* |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 788 | * At handling SwapCache, pc->mem_cgroup may be changed while it's linked to |
| 789 | * lru because the page may.be reused after it's fully uncharged (because of |
| 790 | * SwapCache behavior).To handle that, unlink page_cgroup from LRU when charge |
| 791 | * it again. This function is only used to charge SwapCache. It's done under |
| 792 | * lock_page and expected that zone->lru_lock is never held. |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 793 | */ |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 794 | static void mem_cgroup_lru_del_before_commit_swapcache(struct page *page) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 795 | { |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 796 | unsigned long flags; |
| 797 | struct zone *zone = page_zone(page); |
| 798 | struct page_cgroup *pc = lookup_page_cgroup(page); |
| 799 | |
| 800 | spin_lock_irqsave(&zone->lru_lock, flags); |
| 801 | /* |
| 802 | * Forget old LRU when this page_cgroup is *not* used. This Used bit |
| 803 | * is guarded by lock_page() because the page is SwapCache. |
| 804 | */ |
| 805 | if (!PageCgroupUsed(pc)) |
| 806 | mem_cgroup_del_lru_list(page, page_lru(page)); |
| 807 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 808 | } |
| 809 | |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 810 | static void mem_cgroup_lru_add_after_commit_swapcache(struct page *page) |
| 811 | { |
| 812 | unsigned long flags; |
| 813 | struct zone *zone = page_zone(page); |
| 814 | struct page_cgroup *pc = lookup_page_cgroup(page); |
| 815 | |
| 816 | spin_lock_irqsave(&zone->lru_lock, flags); |
| 817 | /* 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] | 818 | if (PageLRU(page) && !PageCgroupAcctLRU(pc)) |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 819 | mem_cgroup_add_lru_list(page, page_lru(page)); |
| 820 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
| 821 | } |
| 822 | |
| 823 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 824 | void mem_cgroup_move_lists(struct page *page, |
| 825 | enum lru_list from, enum lru_list to) |
| 826 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 827 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 828 | return; |
| 829 | mem_cgroup_del_lru_list(page, from); |
| 830 | mem_cgroup_add_lru_list(page, to); |
| 831 | } |
| 832 | |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 833 | int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem) |
| 834 | { |
| 835 | int ret; |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 836 | struct mem_cgroup *curr = NULL; |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 837 | |
| 838 | task_lock(task); |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 839 | rcu_read_lock(); |
| 840 | curr = try_get_mem_cgroup_from_mm(task->mm); |
| 841 | rcu_read_unlock(); |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 842 | task_unlock(task); |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 843 | if (!curr) |
| 844 | return 0; |
Daisuke Nishimura | d31f56d | 2009-12-15 16:47:12 -0800 | [diff] [blame] | 845 | /* |
| 846 | * We should check use_hierarchy of "mem" not "curr". Because checking |
| 847 | * use_hierarchy of "curr" here make this function true if hierarchy is |
| 848 | * enabled in "curr" and "curr" is a child of "mem" in *cgroup* |
| 849 | * hierarchy(even if use_hierarchy is disabled in "mem"). |
| 850 | */ |
| 851 | if (mem->use_hierarchy) |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 852 | ret = css_is_ancestor(&curr->css, &mem->css); |
| 853 | else |
| 854 | ret = (curr == mem); |
| 855 | css_put(&curr->css); |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 856 | return ret; |
| 857 | } |
| 858 | |
KOSAKI Motohiro | c772be9 | 2009-01-07 18:08:25 -0800 | [diff] [blame] | 859 | 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] | 860 | { |
| 861 | unsigned long active; |
| 862 | unsigned long inactive; |
KOSAKI Motohiro | c772be9 | 2009-01-07 18:08:25 -0800 | [diff] [blame] | 863 | unsigned long gb; |
| 864 | unsigned long inactive_ratio; |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 865 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 866 | inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_ANON); |
| 867 | active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_ANON); |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 868 | |
KOSAKI Motohiro | c772be9 | 2009-01-07 18:08:25 -0800 | [diff] [blame] | 869 | gb = (inactive + active) >> (30 - PAGE_SHIFT); |
| 870 | if (gb) |
| 871 | inactive_ratio = int_sqrt(10 * gb); |
| 872 | else |
| 873 | inactive_ratio = 1; |
| 874 | |
| 875 | if (present_pages) { |
| 876 | present_pages[0] = inactive; |
| 877 | present_pages[1] = active; |
| 878 | } |
| 879 | |
| 880 | return inactive_ratio; |
| 881 | } |
| 882 | |
| 883 | int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg) |
| 884 | { |
| 885 | unsigned long active; |
| 886 | unsigned long inactive; |
| 887 | unsigned long present_pages[2]; |
| 888 | unsigned long inactive_ratio; |
| 889 | |
| 890 | inactive_ratio = calc_inactive_ratio(memcg, present_pages); |
| 891 | |
| 892 | inactive = present_pages[0]; |
| 893 | active = present_pages[1]; |
| 894 | |
| 895 | if (inactive * inactive_ratio < active) |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 896 | return 1; |
| 897 | |
| 898 | return 0; |
| 899 | } |
| 900 | |
Rik van Riel | 56e49d2 | 2009-06-16 15:32:28 -0700 | [diff] [blame] | 901 | int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg) |
| 902 | { |
| 903 | unsigned long active; |
| 904 | unsigned long inactive; |
| 905 | |
| 906 | inactive = mem_cgroup_get_local_zonestat(memcg, LRU_INACTIVE_FILE); |
| 907 | active = mem_cgroup_get_local_zonestat(memcg, LRU_ACTIVE_FILE); |
| 908 | |
| 909 | return (active > inactive); |
| 910 | } |
| 911 | |
KOSAKI Motohiro | a3d8e05 | 2009-01-07 18:08:19 -0800 | [diff] [blame] | 912 | unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, |
| 913 | struct zone *zone, |
| 914 | enum lru_list lru) |
| 915 | { |
| 916 | int nid = zone->zone_pgdat->node_id; |
| 917 | int zid = zone_idx(zone); |
| 918 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid); |
| 919 | |
| 920 | return MEM_CGROUP_ZSTAT(mz, lru); |
| 921 | } |
| 922 | |
KOSAKI Motohiro | 3e2f41f | 2009-01-07 18:08:20 -0800 | [diff] [blame] | 923 | struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, |
| 924 | struct zone *zone) |
| 925 | { |
| 926 | int nid = zone->zone_pgdat->node_id; |
| 927 | int zid = zone_idx(zone); |
| 928 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid); |
| 929 | |
| 930 | return &mz->reclaim_stat; |
| 931 | } |
| 932 | |
| 933 | struct zone_reclaim_stat * |
| 934 | mem_cgroup_get_reclaim_stat_from_page(struct page *page) |
| 935 | { |
| 936 | struct page_cgroup *pc; |
| 937 | struct mem_cgroup_per_zone *mz; |
| 938 | |
| 939 | if (mem_cgroup_disabled()) |
| 940 | return NULL; |
| 941 | |
| 942 | pc = lookup_page_cgroup(page); |
Daisuke Nishimura | bd112db | 2009-01-15 13:51:11 -0800 | [diff] [blame] | 943 | /* |
| 944 | * Used bit is set without atomic ops but after smp_wmb(). |
| 945 | * For making pc->mem_cgroup visible, insert smp_rmb() here. |
| 946 | */ |
| 947 | smp_rmb(); |
| 948 | if (!PageCgroupUsed(pc)) |
| 949 | return NULL; |
| 950 | |
KOSAKI Motohiro | 3e2f41f | 2009-01-07 18:08:20 -0800 | [diff] [blame] | 951 | mz = page_cgroup_zoneinfo(pc); |
| 952 | if (!mz) |
| 953 | return NULL; |
| 954 | |
| 955 | return &mz->reclaim_stat; |
| 956 | } |
| 957 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 958 | unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, |
| 959 | struct list_head *dst, |
| 960 | unsigned long *scanned, int order, |
| 961 | int mode, struct zone *z, |
| 962 | struct mem_cgroup *mem_cont, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 963 | int active, int file) |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 964 | { |
| 965 | unsigned long nr_taken = 0; |
| 966 | struct page *page; |
| 967 | unsigned long scan; |
| 968 | LIST_HEAD(pc_list); |
| 969 | struct list_head *src; |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 970 | struct page_cgroup *pc, *tmp; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 971 | int nid = z->zone_pgdat->node_id; |
| 972 | int zid = zone_idx(z); |
| 973 | struct mem_cgroup_per_zone *mz; |
Johannes Weiner | b7c46d1 | 2009-09-21 17:02:56 -0700 | [diff] [blame] | 974 | int lru = LRU_FILE * file + active; |
KAMEZAWA Hiroyuki | 2ffebca | 2009-06-17 16:27:21 -0700 | [diff] [blame] | 975 | int ret; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 976 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 977 | BUG_ON(!mem_cont); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 978 | mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 979 | src = &mz->lists[lru]; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 980 | |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 981 | scan = 0; |
| 982 | list_for_each_entry_safe_reverse(pc, tmp, src, lru) { |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 983 | if (scan >= nr_to_scan) |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 984 | break; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 985 | |
| 986 | page = pc->page; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 987 | if (unlikely(!PageCgroupUsed(pc))) |
| 988 | continue; |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 989 | if (unlikely(!PageLRU(page))) |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 990 | continue; |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 991 | |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 992 | scan++; |
KAMEZAWA Hiroyuki | 2ffebca | 2009-06-17 16:27:21 -0700 | [diff] [blame] | 993 | ret = __isolate_lru_page(page, mode, file); |
| 994 | switch (ret) { |
| 995 | case 0: |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 996 | list_move(&page->lru, dst); |
KAMEZAWA Hiroyuki | 2ffebca | 2009-06-17 16:27:21 -0700 | [diff] [blame] | 997 | mem_cgroup_del_lru(page); |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 998 | nr_taken++; |
KAMEZAWA Hiroyuki | 2ffebca | 2009-06-17 16:27:21 -0700 | [diff] [blame] | 999 | break; |
| 1000 | case -EBUSY: |
| 1001 | /* we don't affect global LRU but rotate in our LRU */ |
| 1002 | mem_cgroup_rotate_lru_list(page, page_lru(page)); |
| 1003 | break; |
| 1004 | default: |
| 1005 | break; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1006 | } |
| 1007 | } |
| 1008 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1009 | *scanned = scan; |
| 1010 | return nr_taken; |
| 1011 | } |
| 1012 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1013 | #define mem_cgroup_from_res_counter(counter, member) \ |
| 1014 | container_of(counter, struct mem_cgroup, member) |
| 1015 | |
Daisuke Nishimura | b85a96c | 2009-01-07 18:08:12 -0800 | [diff] [blame] | 1016 | static bool mem_cgroup_check_under_limit(struct mem_cgroup *mem) |
| 1017 | { |
| 1018 | if (do_swap_account) { |
| 1019 | if (res_counter_check_under_limit(&mem->res) && |
| 1020 | res_counter_check_under_limit(&mem->memsw)) |
| 1021 | return true; |
| 1022 | } else |
| 1023 | if (res_counter_check_under_limit(&mem->res)) |
| 1024 | return true; |
| 1025 | return false; |
| 1026 | } |
| 1027 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 1028 | static unsigned int get_swappiness(struct mem_cgroup *memcg) |
| 1029 | { |
| 1030 | struct cgroup *cgrp = memcg->css.cgroup; |
| 1031 | unsigned int swappiness; |
| 1032 | |
| 1033 | /* root ? */ |
| 1034 | if (cgrp->parent == NULL) |
| 1035 | return vm_swappiness; |
| 1036 | |
| 1037 | spin_lock(&memcg->reclaim_param_lock); |
| 1038 | swappiness = memcg->swappiness; |
| 1039 | spin_unlock(&memcg->reclaim_param_lock); |
| 1040 | |
| 1041 | return swappiness; |
| 1042 | } |
| 1043 | |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1044 | static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data) |
| 1045 | { |
| 1046 | int *val = data; |
| 1047 | (*val)++; |
| 1048 | return 0; |
| 1049 | } |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1050 | |
| 1051 | /** |
Kirill A. Shutemov | 6a6135b | 2010-03-10 15:22:25 -0800 | [diff] [blame] | 1052 | * 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] | 1053 | * @memcg: The memory cgroup that went over limit |
| 1054 | * @p: Task that is going to be killed |
| 1055 | * |
| 1056 | * NOTE: @memcg and @p's mem_cgroup can be different when hierarchy is |
| 1057 | * enabled |
| 1058 | */ |
| 1059 | void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) |
| 1060 | { |
| 1061 | struct cgroup *task_cgrp; |
| 1062 | struct cgroup *mem_cgrp; |
| 1063 | /* |
| 1064 | * Need a buffer in BSS, can't rely on allocations. The code relies |
| 1065 | * on the assumption that OOM is serialized for memory controller. |
| 1066 | * If this assumption is broken, revisit this code. |
| 1067 | */ |
| 1068 | static char memcg_name[PATH_MAX]; |
| 1069 | int ret; |
| 1070 | |
Daisuke Nishimura | d31f56d | 2009-12-15 16:47:12 -0800 | [diff] [blame] | 1071 | if (!memcg || !p) |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1072 | return; |
| 1073 | |
| 1074 | |
| 1075 | rcu_read_lock(); |
| 1076 | |
| 1077 | mem_cgrp = memcg->css.cgroup; |
| 1078 | task_cgrp = task_cgroup(p, mem_cgroup_subsys_id); |
| 1079 | |
| 1080 | ret = cgroup_path(task_cgrp, memcg_name, PATH_MAX); |
| 1081 | if (ret < 0) { |
| 1082 | /* |
| 1083 | * Unfortunately, we are unable to convert to a useful name |
| 1084 | * But we'll still print out the usage information |
| 1085 | */ |
| 1086 | rcu_read_unlock(); |
| 1087 | goto done; |
| 1088 | } |
| 1089 | rcu_read_unlock(); |
| 1090 | |
| 1091 | printk(KERN_INFO "Task in %s killed", memcg_name); |
| 1092 | |
| 1093 | rcu_read_lock(); |
| 1094 | ret = cgroup_path(mem_cgrp, memcg_name, PATH_MAX); |
| 1095 | if (ret < 0) { |
| 1096 | rcu_read_unlock(); |
| 1097 | goto done; |
| 1098 | } |
| 1099 | rcu_read_unlock(); |
| 1100 | |
| 1101 | /* |
| 1102 | * Continues from above, so we don't need an KERN_ level |
| 1103 | */ |
| 1104 | printk(KERN_CONT " as a result of limit of %s\n", memcg_name); |
| 1105 | done: |
| 1106 | |
| 1107 | printk(KERN_INFO "memory: usage %llukB, limit %llukB, failcnt %llu\n", |
| 1108 | res_counter_read_u64(&memcg->res, RES_USAGE) >> 10, |
| 1109 | res_counter_read_u64(&memcg->res, RES_LIMIT) >> 10, |
| 1110 | res_counter_read_u64(&memcg->res, RES_FAILCNT)); |
| 1111 | printk(KERN_INFO "memory+swap: usage %llukB, limit %llukB, " |
| 1112 | "failcnt %llu\n", |
| 1113 | res_counter_read_u64(&memcg->memsw, RES_USAGE) >> 10, |
| 1114 | res_counter_read_u64(&memcg->memsw, RES_LIMIT) >> 10, |
| 1115 | res_counter_read_u64(&memcg->memsw, RES_FAILCNT)); |
| 1116 | } |
| 1117 | |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1118 | /* |
| 1119 | * This function returns the number of memcg under hierarchy tree. Returns |
| 1120 | * 1(self count) if no children. |
| 1121 | */ |
| 1122 | static int mem_cgroup_count_children(struct mem_cgroup *mem) |
| 1123 | { |
| 1124 | int num = 0; |
| 1125 | mem_cgroup_walk_tree(mem, &num, mem_cgroup_count_children_cb); |
| 1126 | return num; |
| 1127 | } |
| 1128 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1129 | /* |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame^] | 1130 | * Return the memory (and swap, if configured) limit for a memcg. |
| 1131 | */ |
| 1132 | u64 mem_cgroup_get_limit(struct mem_cgroup *memcg) |
| 1133 | { |
| 1134 | u64 limit; |
| 1135 | u64 memsw; |
| 1136 | |
| 1137 | limit = res_counter_read_u64(&memcg->res, RES_LIMIT) + |
| 1138 | total_swap_pages; |
| 1139 | memsw = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 1140 | /* |
| 1141 | * If memsw is finite and limits the amount of swap space available |
| 1142 | * to this memcg, return that limit. |
| 1143 | */ |
| 1144 | return min(limit, memsw); |
| 1145 | } |
| 1146 | |
| 1147 | /* |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1148 | * Visit the first child (need not be the first child as per the ordering |
| 1149 | * of the cgroup list, since we track last_scanned_child) of @mem and use |
| 1150 | * that to reclaim free pages from. |
| 1151 | */ |
| 1152 | static struct mem_cgroup * |
| 1153 | mem_cgroup_select_victim(struct mem_cgroup *root_mem) |
| 1154 | { |
| 1155 | struct mem_cgroup *ret = NULL; |
| 1156 | struct cgroup_subsys_state *css; |
| 1157 | int nextid, found; |
| 1158 | |
| 1159 | if (!root_mem->use_hierarchy) { |
| 1160 | css_get(&root_mem->css); |
| 1161 | ret = root_mem; |
| 1162 | } |
| 1163 | |
| 1164 | while (!ret) { |
| 1165 | rcu_read_lock(); |
| 1166 | nextid = root_mem->last_scanned_child + 1; |
| 1167 | css = css_get_next(&mem_cgroup_subsys, nextid, &root_mem->css, |
| 1168 | &found); |
| 1169 | if (css && css_tryget(css)) |
| 1170 | ret = container_of(css, struct mem_cgroup, css); |
| 1171 | |
| 1172 | rcu_read_unlock(); |
| 1173 | /* Updates scanning parameter */ |
| 1174 | spin_lock(&root_mem->reclaim_param_lock); |
| 1175 | if (!css) { |
| 1176 | /* this means start scan from ID:1 */ |
| 1177 | root_mem->last_scanned_child = 0; |
| 1178 | } else |
| 1179 | root_mem->last_scanned_child = found; |
| 1180 | spin_unlock(&root_mem->reclaim_param_lock); |
| 1181 | } |
| 1182 | |
| 1183 | return ret; |
| 1184 | } |
| 1185 | |
| 1186 | /* |
| 1187 | * Scan the hierarchy if needed to reclaim memory. We remember the last child |
| 1188 | * we reclaimed from, so that we don't end up penalizing one child extensively |
| 1189 | * based on its position in the children list. |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1190 | * |
| 1191 | * root_mem is the original ancestor that we've been reclaim from. |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1192 | * |
| 1193 | * We give up and return to the caller when we visit root_mem twice. |
| 1194 | * (other groups can be removed while we're walking....) |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1195 | * |
| 1196 | * If shrink==true, for avoiding to free too much, this returns immedieately. |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1197 | */ |
| 1198 | static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem, |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1199 | struct zone *zone, |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 1200 | gfp_t gfp_mask, |
| 1201 | unsigned long reclaim_options) |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1202 | { |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1203 | struct mem_cgroup *victim; |
| 1204 | int ret, total = 0; |
| 1205 | int loop = 0; |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 1206 | bool noswap = reclaim_options & MEM_CGROUP_RECLAIM_NOSWAP; |
| 1207 | bool shrink = reclaim_options & MEM_CGROUP_RECLAIM_SHRINK; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1208 | bool check_soft = reclaim_options & MEM_CGROUP_RECLAIM_SOFT; |
| 1209 | unsigned long excess = mem_cgroup_get_excess(root_mem); |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1210 | |
KAMEZAWA Hiroyuki | 22a668d | 2009-06-17 16:27:19 -0700 | [diff] [blame] | 1211 | /* If memsw_is_minimum==1, swap-out is of-no-use. */ |
| 1212 | if (root_mem->memsw_is_minimum) |
| 1213 | noswap = true; |
| 1214 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1215 | while (1) { |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1216 | victim = mem_cgroup_select_victim(root_mem); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1217 | if (victim == root_mem) { |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1218 | loop++; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1219 | if (loop >= 1) |
| 1220 | drain_all_stock_async(); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1221 | if (loop >= 2) { |
| 1222 | /* |
| 1223 | * If we have not been able to reclaim |
| 1224 | * anything, it might because there are |
| 1225 | * no reclaimable pages under this hierarchy |
| 1226 | */ |
| 1227 | if (!check_soft || !total) { |
| 1228 | css_put(&victim->css); |
| 1229 | break; |
| 1230 | } |
| 1231 | /* |
| 1232 | * We want to do more targetted reclaim. |
| 1233 | * excess >> 2 is not to excessive so as to |
| 1234 | * reclaim too much, nor too less that we keep |
| 1235 | * coming back to reclaim from this cgroup |
| 1236 | */ |
| 1237 | if (total >= (excess >> 2) || |
| 1238 | (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) { |
| 1239 | css_put(&victim->css); |
| 1240 | break; |
| 1241 | } |
| 1242 | } |
| 1243 | } |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 1244 | if (!mem_cgroup_local_usage(victim)) { |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1245 | /* this cgroup's local usage == 0 */ |
| 1246 | css_put(&victim->css); |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1247 | continue; |
| 1248 | } |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1249 | /* we use swappiness of local cgroup */ |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1250 | if (check_soft) |
| 1251 | ret = mem_cgroup_shrink_node_zone(victim, gfp_mask, |
| 1252 | noswap, get_swappiness(victim), zone, |
| 1253 | zone->zone_pgdat->node_id); |
| 1254 | else |
| 1255 | ret = try_to_free_mem_cgroup_pages(victim, gfp_mask, |
| 1256 | noswap, get_swappiness(victim)); |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1257 | css_put(&victim->css); |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1258 | /* |
| 1259 | * At shrinking usage, we can't check we should stop here or |
| 1260 | * reclaim more. It's depends on callers. last_scanned_child |
| 1261 | * will work enough for keeping fairness under tree. |
| 1262 | */ |
| 1263 | if (shrink) |
| 1264 | return ret; |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1265 | total += ret; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1266 | if (check_soft) { |
| 1267 | if (res_counter_check_under_soft_limit(&root_mem->res)) |
| 1268 | return total; |
| 1269 | } else if (mem_cgroup_check_under_limit(root_mem)) |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1270 | return 1 + total; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1271 | } |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 1272 | return total; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1273 | } |
| 1274 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1275 | static int mem_cgroup_oom_lock_cb(struct mem_cgroup *mem, void *data) |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1276 | { |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1277 | int *val = (int *)data; |
| 1278 | int x; |
| 1279 | /* |
| 1280 | * Logically, we can stop scanning immediately when we find |
| 1281 | * a memcg is already locked. But condidering unlock ops and |
| 1282 | * creation/removal of memcg, scan-all is simple operation. |
| 1283 | */ |
| 1284 | x = atomic_inc_return(&mem->oom_lock); |
| 1285 | *val = max(x, *val); |
| 1286 | return 0; |
| 1287 | } |
| 1288 | /* |
| 1289 | * Check OOM-Killer is already running under our hierarchy. |
| 1290 | * If someone is running, return false. |
| 1291 | */ |
| 1292 | static bool mem_cgroup_oom_lock(struct mem_cgroup *mem) |
| 1293 | { |
| 1294 | int lock_count = 0; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1295 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1296 | mem_cgroup_walk_tree(mem, &lock_count, mem_cgroup_oom_lock_cb); |
| 1297 | |
| 1298 | if (lock_count == 1) |
| 1299 | return true; |
| 1300 | return false; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1301 | } |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1302 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1303 | static int mem_cgroup_oom_unlock_cb(struct mem_cgroup *mem, void *data) |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1304 | { |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1305 | /* |
| 1306 | * When a new child is created while the hierarchy is under oom, |
| 1307 | * mem_cgroup_oom_lock() may not be called. We have to use |
| 1308 | * atomic_add_unless() here. |
| 1309 | */ |
| 1310 | atomic_add_unless(&mem->oom_lock, -1, 0); |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1311 | return 0; |
| 1312 | } |
| 1313 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1314 | static void mem_cgroup_oom_unlock(struct mem_cgroup *mem) |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1315 | { |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1316 | mem_cgroup_walk_tree(mem, NULL, mem_cgroup_oom_unlock_cb); |
| 1317 | } |
| 1318 | |
| 1319 | static DEFINE_MUTEX(memcg_oom_mutex); |
| 1320 | static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq); |
| 1321 | |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1322 | struct oom_wait_info { |
| 1323 | struct mem_cgroup *mem; |
| 1324 | wait_queue_t wait; |
| 1325 | }; |
| 1326 | |
| 1327 | static int memcg_oom_wake_function(wait_queue_t *wait, |
| 1328 | unsigned mode, int sync, void *arg) |
| 1329 | { |
| 1330 | struct mem_cgroup *wake_mem = (struct mem_cgroup *)arg; |
| 1331 | struct oom_wait_info *oom_wait_info; |
| 1332 | |
| 1333 | oom_wait_info = container_of(wait, struct oom_wait_info, wait); |
| 1334 | |
| 1335 | if (oom_wait_info->mem == wake_mem) |
| 1336 | goto wakeup; |
| 1337 | /* if no hierarchy, no match */ |
| 1338 | if (!oom_wait_info->mem->use_hierarchy || !wake_mem->use_hierarchy) |
| 1339 | return 0; |
| 1340 | /* |
| 1341 | * Both of oom_wait_info->mem and wake_mem are stable under us. |
| 1342 | * Then we can use css_is_ancestor without taking care of RCU. |
| 1343 | */ |
| 1344 | if (!css_is_ancestor(&oom_wait_info->mem->css, &wake_mem->css) && |
| 1345 | !css_is_ancestor(&wake_mem->css, &oom_wait_info->mem->css)) |
| 1346 | return 0; |
| 1347 | |
| 1348 | wakeup: |
| 1349 | return autoremove_wake_function(wait, mode, sync, arg); |
| 1350 | } |
| 1351 | |
| 1352 | static void memcg_wakeup_oom(struct mem_cgroup *mem) |
| 1353 | { |
| 1354 | /* for filtering, pass "mem" as argument. */ |
| 1355 | __wake_up(&memcg_oom_waitq, TASK_NORMAL, 0, mem); |
| 1356 | } |
| 1357 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1358 | static void memcg_oom_recover(struct mem_cgroup *mem) |
| 1359 | { |
KAMEZAWA Hiroyuki | 4d845eb | 2010-06-29 15:05:18 -0700 | [diff] [blame] | 1360 | if (atomic_read(&mem->oom_lock)) |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1361 | memcg_wakeup_oom(mem); |
| 1362 | } |
| 1363 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1364 | /* |
| 1365 | * try to call OOM killer. returns false if we should exit memory-reclaim loop. |
| 1366 | */ |
| 1367 | bool mem_cgroup_handle_oom(struct mem_cgroup *mem, gfp_t mask) |
| 1368 | { |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1369 | struct oom_wait_info owait; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1370 | bool locked, need_to_kill; |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1371 | |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1372 | owait.mem = mem; |
| 1373 | owait.wait.flags = 0; |
| 1374 | owait.wait.func = memcg_oom_wake_function; |
| 1375 | owait.wait.private = current; |
| 1376 | INIT_LIST_HEAD(&owait.wait.task_list); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1377 | need_to_kill = true; |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1378 | /* At first, try to OOM lock hierarchy under mem.*/ |
| 1379 | mutex_lock(&memcg_oom_mutex); |
| 1380 | locked = mem_cgroup_oom_lock(mem); |
| 1381 | /* |
| 1382 | * Even if signal_pending(), we can't quit charge() loop without |
| 1383 | * accounting. So, UNINTERRUPTIBLE is appropriate. But SIGKILL |
| 1384 | * under OOM is always welcomed, use TASK_KILLABLE here. |
| 1385 | */ |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1386 | prepare_to_wait(&memcg_oom_waitq, &owait.wait, TASK_KILLABLE); |
| 1387 | if (!locked || mem->oom_kill_disable) |
| 1388 | need_to_kill = false; |
| 1389 | if (locked) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1390 | mem_cgroup_oom_notify(mem); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1391 | mutex_unlock(&memcg_oom_mutex); |
| 1392 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1393 | if (need_to_kill) { |
| 1394 | finish_wait(&memcg_oom_waitq, &owait.wait); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1395 | mem_cgroup_out_of_memory(mem, mask); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1396 | } else { |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1397 | schedule(); |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1398 | finish_wait(&memcg_oom_waitq, &owait.wait); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1399 | } |
| 1400 | mutex_lock(&memcg_oom_mutex); |
| 1401 | mem_cgroup_oom_unlock(mem); |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1402 | memcg_wakeup_oom(mem); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1403 | mutex_unlock(&memcg_oom_mutex); |
| 1404 | |
| 1405 | if (test_thread_flag(TIF_MEMDIE) || fatal_signal_pending(current)) |
| 1406 | return false; |
| 1407 | /* Give chance to dying process */ |
| 1408 | schedule_timeout(1); |
| 1409 | return true; |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1410 | } |
| 1411 | |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1412 | /* |
| 1413 | * Currently used to update mapped file statistics, but the routine can be |
| 1414 | * generalized to update other statistics as well. |
| 1415 | */ |
KAMEZAWA Hiroyuki | d804658 | 2009-12-15 16:47:09 -0800 | [diff] [blame] | 1416 | void mem_cgroup_update_file_mapped(struct page *page, int val) |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1417 | { |
| 1418 | struct mem_cgroup *mem; |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1419 | struct page_cgroup *pc; |
| 1420 | |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1421 | pc = lookup_page_cgroup(page); |
| 1422 | if (unlikely(!pc)) |
| 1423 | return; |
| 1424 | |
| 1425 | lock_page_cgroup(pc); |
| 1426 | mem = pc->mem_cgroup; |
KAMEZAWA Hiroyuki | 8725d54 | 2010-04-06 14:35:05 -0700 | [diff] [blame] | 1427 | if (!mem || !PageCgroupUsed(pc)) |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1428 | goto done; |
| 1429 | |
| 1430 | /* |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 1431 | * Preemption is already disabled. We can use __this_cpu_xxx |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1432 | */ |
KAMEZAWA Hiroyuki | 8725d54 | 2010-04-06 14:35:05 -0700 | [diff] [blame] | 1433 | if (val > 0) { |
| 1434 | __this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); |
| 1435 | SetPageCgroupFileMapped(pc); |
| 1436 | } else { |
| 1437 | __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); |
| 1438 | ClearPageCgroupFileMapped(pc); |
| 1439 | } |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1440 | |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1441 | done: |
| 1442 | unlock_page_cgroup(pc); |
| 1443 | } |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1444 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1445 | /* |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1446 | * size of first charge trial. "32" comes from vmscan.c's magic value. |
| 1447 | * TODO: maybe necessary to use big numbers in big irons. |
| 1448 | */ |
| 1449 | #define CHARGE_SIZE (32 * PAGE_SIZE) |
| 1450 | struct memcg_stock_pcp { |
| 1451 | struct mem_cgroup *cached; /* this never be root cgroup */ |
| 1452 | int charge; |
| 1453 | struct work_struct work; |
| 1454 | }; |
| 1455 | static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock); |
| 1456 | static atomic_t memcg_drain_count; |
| 1457 | |
| 1458 | /* |
| 1459 | * Try to consume stocked charge on this cpu. If success, PAGE_SIZE is consumed |
| 1460 | * from local stock and true is returned. If the stock is 0 or charges from a |
| 1461 | * cgroup which is not current target, returns false. This stock will be |
| 1462 | * refilled. |
| 1463 | */ |
| 1464 | static bool consume_stock(struct mem_cgroup *mem) |
| 1465 | { |
| 1466 | struct memcg_stock_pcp *stock; |
| 1467 | bool ret = true; |
| 1468 | |
| 1469 | stock = &get_cpu_var(memcg_stock); |
| 1470 | if (mem == stock->cached && stock->charge) |
| 1471 | stock->charge -= PAGE_SIZE; |
| 1472 | else /* need to call res_counter_charge */ |
| 1473 | ret = false; |
| 1474 | put_cpu_var(memcg_stock); |
| 1475 | return ret; |
| 1476 | } |
| 1477 | |
| 1478 | /* |
| 1479 | * Returns stocks cached in percpu to res_counter and reset cached information. |
| 1480 | */ |
| 1481 | static void drain_stock(struct memcg_stock_pcp *stock) |
| 1482 | { |
| 1483 | struct mem_cgroup *old = stock->cached; |
| 1484 | |
| 1485 | if (stock->charge) { |
| 1486 | res_counter_uncharge(&old->res, stock->charge); |
| 1487 | if (do_swap_account) |
| 1488 | res_counter_uncharge(&old->memsw, stock->charge); |
| 1489 | } |
| 1490 | stock->cached = NULL; |
| 1491 | stock->charge = 0; |
| 1492 | } |
| 1493 | |
| 1494 | /* |
| 1495 | * This must be called under preempt disabled or must be called by |
| 1496 | * a thread which is pinned to local cpu. |
| 1497 | */ |
| 1498 | static void drain_local_stock(struct work_struct *dummy) |
| 1499 | { |
| 1500 | struct memcg_stock_pcp *stock = &__get_cpu_var(memcg_stock); |
| 1501 | drain_stock(stock); |
| 1502 | } |
| 1503 | |
| 1504 | /* |
| 1505 | * 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] | 1506 | * This will be consumed by consume_stock() function, later. |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1507 | */ |
| 1508 | static void refill_stock(struct mem_cgroup *mem, int val) |
| 1509 | { |
| 1510 | struct memcg_stock_pcp *stock = &get_cpu_var(memcg_stock); |
| 1511 | |
| 1512 | if (stock->cached != mem) { /* reset if necessary */ |
| 1513 | drain_stock(stock); |
| 1514 | stock->cached = mem; |
| 1515 | } |
| 1516 | stock->charge += val; |
| 1517 | put_cpu_var(memcg_stock); |
| 1518 | } |
| 1519 | |
| 1520 | /* |
| 1521 | * Tries to drain stocked charges in other cpus. This function is asynchronous |
| 1522 | * and just put a work per cpu for draining localy on each cpu. Caller can |
| 1523 | * expects some charges will be back to res_counter later but cannot wait for |
| 1524 | * it. |
| 1525 | */ |
| 1526 | static void drain_all_stock_async(void) |
| 1527 | { |
| 1528 | int cpu; |
| 1529 | /* This function is for scheduling "drain" in asynchronous way. |
| 1530 | * The result of "drain" is not directly handled by callers. Then, |
| 1531 | * if someone is calling drain, we don't have to call drain more. |
| 1532 | * Anyway, WORK_STRUCT_PENDING check in queue_work_on() will catch if |
| 1533 | * there is a race. We just do loose check here. |
| 1534 | */ |
| 1535 | if (atomic_read(&memcg_drain_count)) |
| 1536 | return; |
| 1537 | /* Notify other cpus that system-wide "drain" is running */ |
| 1538 | atomic_inc(&memcg_drain_count); |
| 1539 | get_online_cpus(); |
| 1540 | for_each_online_cpu(cpu) { |
| 1541 | struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu); |
| 1542 | schedule_work_on(cpu, &stock->work); |
| 1543 | } |
| 1544 | put_online_cpus(); |
| 1545 | atomic_dec(&memcg_drain_count); |
| 1546 | /* We don't wait for flush_work */ |
| 1547 | } |
| 1548 | |
| 1549 | /* This is a synchronous drain interface. */ |
| 1550 | static void drain_all_stock_sync(void) |
| 1551 | { |
| 1552 | /* called when force_empty is called */ |
| 1553 | atomic_inc(&memcg_drain_count); |
| 1554 | schedule_on_each_cpu(drain_local_stock); |
| 1555 | atomic_dec(&memcg_drain_count); |
| 1556 | } |
| 1557 | |
| 1558 | static int __cpuinit memcg_stock_cpu_callback(struct notifier_block *nb, |
| 1559 | unsigned long action, |
| 1560 | void *hcpu) |
| 1561 | { |
| 1562 | int cpu = (unsigned long)hcpu; |
| 1563 | struct memcg_stock_pcp *stock; |
| 1564 | |
| 1565 | if (action != CPU_DEAD) |
| 1566 | return NOTIFY_OK; |
| 1567 | stock = &per_cpu(memcg_stock, cpu); |
| 1568 | drain_stock(stock); |
| 1569 | return NOTIFY_OK; |
| 1570 | } |
| 1571 | |
| 1572 | /* |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1573 | * Unlike exported interface, "oom" parameter is added. if oom==true, |
| 1574 | * oom-killer can be invoked. |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1575 | */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1576 | static int __mem_cgroup_try_charge(struct mm_struct *mm, |
KAMEZAWA Hiroyuki | 430e4863 | 2010-03-10 15:22:30 -0800 | [diff] [blame] | 1577 | gfp_t gfp_mask, struct mem_cgroup **memcg, bool oom) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1578 | { |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 1579 | struct mem_cgroup *mem, *mem_over_limit; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1580 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 1581 | struct res_counter *fail_res; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1582 | int csize = CHARGE_SIZE; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1583 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1584 | /* |
| 1585 | * Unlike gloval-vm's OOM-kill, we're not in memory shortage |
| 1586 | * in system level. So, allow to go ahead dying process in addition to |
| 1587 | * MEMDIE process. |
| 1588 | */ |
| 1589 | if (unlikely(test_thread_flag(TIF_MEMDIE) |
| 1590 | || fatal_signal_pending(current))) |
| 1591 | goto bypass; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1592 | |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1593 | /* |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 1594 | * We always charge the cgroup the mm_struct belongs to. |
| 1595 | * The mm_struct's mem_cgroup changes on task migration if the |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1596 | * thread group leader migrates. It's possible that mm is not |
| 1597 | * set, if so charge the init_mm (happens for pagecache usage). |
| 1598 | */ |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 1599 | mem = *memcg; |
| 1600 | if (likely(!mem)) { |
| 1601 | mem = try_get_mem_cgroup_from_mm(mm); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1602 | *memcg = mem; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1603 | } else { |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1604 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1605 | } |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 1606 | if (unlikely(!mem)) |
| 1607 | return 0; |
| 1608 | |
Nikanth Karthikesan | 46f7e60 | 2009-05-28 14:34:41 -0700 | [diff] [blame] | 1609 | VM_BUG_ON(css_is_removed(&mem->css)); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1610 | if (mem_cgroup_is_root(mem)) |
| 1611 | goto done; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1612 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1613 | while (1) { |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 1614 | int ret = 0; |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 1615 | unsigned long flags = 0; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1616 | |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1617 | if (consume_stock(mem)) |
KAMEZAWA Hiroyuki | 430e4863 | 2010-03-10 15:22:30 -0800 | [diff] [blame] | 1618 | goto done; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1619 | |
| 1620 | ret = res_counter_charge(&mem->res, csize, &fail_res); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1621 | if (likely(!ret)) { |
| 1622 | if (!do_swap_account) |
| 1623 | break; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1624 | ret = res_counter_charge(&mem->memsw, csize, &fail_res); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1625 | if (likely(!ret)) |
| 1626 | break; |
| 1627 | /* mem+swap counter fails */ |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1628 | res_counter_uncharge(&mem->res, csize); |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 1629 | flags |= MEM_CGROUP_RECLAIM_NOSWAP; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1630 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, |
| 1631 | memsw); |
| 1632 | } else |
| 1633 | /* mem counter fails */ |
| 1634 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, |
| 1635 | res); |
| 1636 | |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1637 | /* reduce request size and retry */ |
| 1638 | if (csize > PAGE_SIZE) { |
| 1639 | csize = PAGE_SIZE; |
| 1640 | continue; |
| 1641 | } |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 1642 | if (!(gfp_mask & __GFP_WAIT)) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1643 | goto nomem; |
Balbir Singh | e1a1cd5 | 2008-02-07 00:14:02 -0800 | [diff] [blame] | 1644 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 1645 | ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, NULL, |
| 1646 | gfp_mask, flags); |
Daisuke Nishimura | 4d1c627 | 2009-01-15 13:51:14 -0800 | [diff] [blame] | 1647 | if (ret) |
| 1648 | continue; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1649 | |
| 1650 | /* |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 1651 | * try_to_free_mem_cgroup_pages() might not give us a full |
| 1652 | * picture of reclaim. Some pages are reclaimed and might be |
| 1653 | * moved to swap cache or just unmapped from the cgroup. |
| 1654 | * Check the limit again to see if the reclaim reduced the |
| 1655 | * current usage of the cgroup before giving up |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1656 | * |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 1657 | */ |
Daisuke Nishimura | b85a96c | 2009-01-07 18:08:12 -0800 | [diff] [blame] | 1658 | if (mem_cgroup_check_under_limit(mem_over_limit)) |
| 1659 | continue; |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 1660 | |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 1661 | /* try to avoid oom while someone is moving charge */ |
| 1662 | if (mc.moving_task && current != mc.moving_task) { |
| 1663 | struct mem_cgroup *from, *to; |
| 1664 | bool do_continue = false; |
| 1665 | /* |
| 1666 | * There is a small race that "from" or "to" can be |
| 1667 | * freed by rmdir, so we use css_tryget(). |
| 1668 | */ |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 1669 | from = mc.from; |
| 1670 | to = mc.to; |
| 1671 | if (from && css_tryget(&from->css)) { |
| 1672 | if (mem_over_limit->use_hierarchy) |
| 1673 | do_continue = css_is_ancestor( |
| 1674 | &from->css, |
| 1675 | &mem_over_limit->css); |
| 1676 | else |
| 1677 | do_continue = (from == mem_over_limit); |
| 1678 | css_put(&from->css); |
| 1679 | } |
| 1680 | if (!do_continue && to && css_tryget(&to->css)) { |
| 1681 | if (mem_over_limit->use_hierarchy) |
| 1682 | do_continue = css_is_ancestor( |
| 1683 | &to->css, |
| 1684 | &mem_over_limit->css); |
| 1685 | else |
| 1686 | do_continue = (to == mem_over_limit); |
| 1687 | css_put(&to->css); |
| 1688 | } |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 1689 | if (do_continue) { |
| 1690 | DEFINE_WAIT(wait); |
| 1691 | prepare_to_wait(&mc.waitq, &wait, |
| 1692 | TASK_INTERRUPTIBLE); |
| 1693 | /* moving charge context might have finished. */ |
| 1694 | if (mc.moving_task) |
| 1695 | schedule(); |
| 1696 | finish_wait(&mc.waitq, &wait); |
| 1697 | continue; |
| 1698 | } |
| 1699 | } |
| 1700 | |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 1701 | if (!nr_retries--) { |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1702 | if (!oom) |
| 1703 | goto nomem; |
| 1704 | if (mem_cgroup_handle_oom(mem_over_limit, gfp_mask)) { |
| 1705 | nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
| 1706 | continue; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1707 | } |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1708 | /* When we reach here, current task is dying .*/ |
| 1709 | css_put(&mem->css); |
| 1710 | goto bypass; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 1711 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1712 | } |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1713 | if (csize > PAGE_SIZE) |
| 1714 | refill_stock(mem, csize - PAGE_SIZE); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 1715 | done: |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1716 | return 0; |
| 1717 | nomem: |
| 1718 | css_put(&mem->css); |
| 1719 | return -ENOMEM; |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1720 | bypass: |
| 1721 | *memcg = NULL; |
| 1722 | return 0; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1723 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1724 | |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 1725 | /* |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 1726 | * Somemtimes we have to undo a charge we got by try_charge(). |
| 1727 | * This function is for that and do uncharge, put css's refcnt. |
| 1728 | * gotten by try_charge(). |
| 1729 | */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1730 | static void __mem_cgroup_cancel_charge(struct mem_cgroup *mem, |
| 1731 | unsigned long count) |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 1732 | { |
| 1733 | if (!mem_cgroup_is_root(mem)) { |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1734 | res_counter_uncharge(&mem->res, PAGE_SIZE * count); |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 1735 | if (do_swap_account) |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1736 | res_counter_uncharge(&mem->memsw, PAGE_SIZE * count); |
| 1737 | VM_BUG_ON(test_bit(CSS_ROOT, &mem->css.flags)); |
| 1738 | WARN_ON_ONCE(count > INT_MAX); |
| 1739 | __css_put(&mem->css, (int)count); |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 1740 | } |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1741 | /* we don't need css_put for root */ |
| 1742 | } |
| 1743 | |
| 1744 | static void mem_cgroup_cancel_charge(struct mem_cgroup *mem) |
| 1745 | { |
| 1746 | __mem_cgroup_cancel_charge(mem, 1); |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 1747 | } |
| 1748 | |
| 1749 | /* |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 1750 | * A helper function to get mem_cgroup from ID. must be called under |
| 1751 | * rcu_read_lock(). The caller must check css_is_removed() or some if |
| 1752 | * it's concern. (dropping refcnt from swap can be called against removed |
| 1753 | * memcg.) |
| 1754 | */ |
| 1755 | static struct mem_cgroup *mem_cgroup_lookup(unsigned short id) |
| 1756 | { |
| 1757 | struct cgroup_subsys_state *css; |
| 1758 | |
| 1759 | /* ID 0 is unused ID */ |
| 1760 | if (!id) |
| 1761 | return NULL; |
| 1762 | css = css_lookup(&mem_cgroup_subsys, id); |
| 1763 | if (!css) |
| 1764 | return NULL; |
| 1765 | return container_of(css, struct mem_cgroup, css); |
| 1766 | } |
| 1767 | |
Wu Fengguang | e42d9d5 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 1768 | struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page) |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 1769 | { |
Wu Fengguang | e42d9d5 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 1770 | struct mem_cgroup *mem = NULL; |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 1771 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 1772 | unsigned short id; |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 1773 | swp_entry_t ent; |
| 1774 | |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 1775 | VM_BUG_ON(!PageLocked(page)); |
| 1776 | |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 1777 | pc = lookup_page_cgroup(page); |
Daisuke Nishimura | c0bd3f6 | 2009-04-30 15:08:11 -0700 | [diff] [blame] | 1778 | lock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 1779 | if (PageCgroupUsed(pc)) { |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 1780 | mem = pc->mem_cgroup; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 1781 | if (mem && !css_tryget(&mem->css)) |
| 1782 | mem = NULL; |
Wu Fengguang | e42d9d5 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 1783 | } else if (PageSwapCache(page)) { |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 1784 | ent.val = page_private(page); |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 1785 | id = lookup_swap_cgroup(ent); |
| 1786 | rcu_read_lock(); |
| 1787 | mem = mem_cgroup_lookup(id); |
| 1788 | if (mem && !css_tryget(&mem->css)) |
| 1789 | mem = NULL; |
| 1790 | rcu_read_unlock(); |
Daisuke Nishimura | 3c776e6 | 2009-04-02 16:57:43 -0700 | [diff] [blame] | 1791 | } |
Daisuke Nishimura | c0bd3f6 | 2009-04-30 15:08:11 -0700 | [diff] [blame] | 1792 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 1793 | return mem; |
| 1794 | } |
| 1795 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1796 | /* |
Daisuke Nishimura | a5e924f | 2009-01-07 18:08:28 -0800 | [diff] [blame] | 1797 | * commit a charge got by __mem_cgroup_try_charge() and makes page_cgroup to be |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1798 | * USED state. If already USED, uncharge and return. |
| 1799 | */ |
| 1800 | |
| 1801 | static void __mem_cgroup_commit_charge(struct mem_cgroup *mem, |
| 1802 | struct page_cgroup *pc, |
| 1803 | enum charge_type ctype) |
| 1804 | { |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1805 | /* try_charge() can return NULL to *memcg, taking care of it. */ |
| 1806 | if (!mem) |
| 1807 | return; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1808 | |
| 1809 | lock_page_cgroup(pc); |
| 1810 | if (unlikely(PageCgroupUsed(pc))) { |
| 1811 | unlock_page_cgroup(pc); |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 1812 | mem_cgroup_cancel_charge(mem); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1813 | return; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1814 | } |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 1815 | |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1816 | pc->mem_cgroup = mem; |
KAMEZAWA Hiroyuki | 261fb61 | 2009-09-23 15:56:33 -0700 | [diff] [blame] | 1817 | /* |
| 1818 | * We access a page_cgroup asynchronously without lock_page_cgroup(). |
| 1819 | * Especially when a page_cgroup is taken from a page, pc->mem_cgroup |
| 1820 | * is accessed after testing USED bit. To make pc->mem_cgroup visible |
| 1821 | * before USED bit, we need memory barrier here. |
| 1822 | * See mem_cgroup_add_lru_list(), etc. |
| 1823 | */ |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1824 | smp_wmb(); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 1825 | switch (ctype) { |
| 1826 | case MEM_CGROUP_CHARGE_TYPE_CACHE: |
| 1827 | case MEM_CGROUP_CHARGE_TYPE_SHMEM: |
| 1828 | SetPageCgroupCache(pc); |
| 1829 | SetPageCgroupUsed(pc); |
| 1830 | break; |
| 1831 | case MEM_CGROUP_CHARGE_TYPE_MAPPED: |
| 1832 | ClearPageCgroupCache(pc); |
| 1833 | SetPageCgroupUsed(pc); |
| 1834 | break; |
| 1835 | default: |
| 1836 | break; |
| 1837 | } |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 1838 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1839 | mem_cgroup_charge_statistics(mem, pc, true); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1840 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1841 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 430e4863 | 2010-03-10 15:22:30 -0800 | [diff] [blame] | 1842 | /* |
| 1843 | * "charge_statistics" updated event counter. Then, check it. |
| 1844 | * Insert ancestor (and ancestor's ancestors), to softlimit RB-tree. |
| 1845 | * if they exceeds softlimit. |
| 1846 | */ |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 1847 | memcg_check_events(mem, pc->page); |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1848 | } |
| 1849 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1850 | /** |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1851 | * __mem_cgroup_move_account - move account of the page |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1852 | * @pc: page_cgroup of the page. |
| 1853 | * @from: mem_cgroup which the page is moved from. |
| 1854 | * @to: mem_cgroup which the page is moved to. @from != @to. |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1855 | * @uncharge: whether we should call uncharge and css_put against @from. |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1856 | * |
| 1857 | * The caller must confirm following. |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1858 | * - page is not on LRU (isolate_page() is useful.) |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1859 | * - the pc is locked, used, and ->mem_cgroup points to @from. |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1860 | * |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1861 | * This function doesn't do "charge" nor css_get to new cgroup. It should be |
| 1862 | * done by a caller(__mem_cgroup_try_charge would be usefull). If @uncharge is |
| 1863 | * true, this function does "uncharge" from old cgroup, but it doesn't if |
| 1864 | * @uncharge is false, so a caller should do "uncharge". |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1865 | */ |
| 1866 | |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1867 | static void __mem_cgroup_move_account(struct page_cgroup *pc, |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1868 | struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge) |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1869 | { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1870 | VM_BUG_ON(from == to); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1871 | VM_BUG_ON(PageLRU(pc->page)); |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1872 | VM_BUG_ON(!PageCgroupLocked(pc)); |
| 1873 | VM_BUG_ON(!PageCgroupUsed(pc)); |
| 1874 | VM_BUG_ON(pc->mem_cgroup != from); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1875 | |
KAMEZAWA Hiroyuki | 8725d54 | 2010-04-06 14:35:05 -0700 | [diff] [blame] | 1876 | if (PageCgroupFileMapped(pc)) { |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 1877 | /* Update mapped_file data for mem_cgroup */ |
| 1878 | preempt_disable(); |
| 1879 | __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); |
| 1880 | __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); |
| 1881 | preempt_enable(); |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1882 | } |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1883 | mem_cgroup_charge_statistics(from, pc, false); |
| 1884 | if (uncharge) |
| 1885 | /* This is not "cancel", but cancel_charge does all we need. */ |
| 1886 | mem_cgroup_cancel_charge(from); |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1887 | |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1888 | /* caller should have done css_get */ |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1889 | pc->mem_cgroup = to; |
| 1890 | mem_cgroup_charge_statistics(to, pc, true); |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 1891 | /* |
| 1892 | * We charges against "to" which may not have any tasks. Then, "to" |
| 1893 | * can be under rmdir(). But in current implementation, caller of |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 1894 | * this function is just force_empty() and move charge, so it's |
| 1895 | * garanteed that "to" is never removed. So, we don't check rmdir |
| 1896 | * status here. |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 1897 | */ |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1898 | } |
| 1899 | |
| 1900 | /* |
| 1901 | * check whether the @pc is valid for moving account and call |
| 1902 | * __mem_cgroup_move_account() |
| 1903 | */ |
| 1904 | static int mem_cgroup_move_account(struct page_cgroup *pc, |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1905 | struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge) |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1906 | { |
| 1907 | int ret = -EINVAL; |
| 1908 | lock_page_cgroup(pc); |
| 1909 | if (PageCgroupUsed(pc) && pc->mem_cgroup == from) { |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1910 | __mem_cgroup_move_account(pc, from, to, uncharge); |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1911 | ret = 0; |
| 1912 | } |
| 1913 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 1914 | /* |
| 1915 | * check events |
| 1916 | */ |
| 1917 | memcg_check_events(to, pc->page); |
| 1918 | memcg_check_events(from, pc->page); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1919 | return ret; |
| 1920 | } |
| 1921 | |
| 1922 | /* |
| 1923 | * move charges to its parent. |
| 1924 | */ |
| 1925 | |
| 1926 | static int mem_cgroup_move_parent(struct page_cgroup *pc, |
| 1927 | struct mem_cgroup *child, |
| 1928 | gfp_t gfp_mask) |
| 1929 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1930 | struct page *page = pc->page; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1931 | struct cgroup *cg = child->css.cgroup; |
| 1932 | struct cgroup *pcg = cg->parent; |
| 1933 | struct mem_cgroup *parent; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1934 | int ret; |
| 1935 | |
| 1936 | /* Is ROOT ? */ |
| 1937 | if (!pcg) |
| 1938 | return -EINVAL; |
| 1939 | |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1940 | ret = -EBUSY; |
| 1941 | if (!get_page_unless_zero(page)) |
| 1942 | goto out; |
| 1943 | if (isolate_lru_page(page)) |
| 1944 | goto put; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1945 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1946 | parent = mem_cgroup_from_cont(pcg); |
KAMEZAWA Hiroyuki | 430e4863 | 2010-03-10 15:22:30 -0800 | [diff] [blame] | 1947 | ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false); |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1948 | if (ret || !parent) |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1949 | goto put_back; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1950 | |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 1951 | ret = mem_cgroup_move_account(pc, child, parent, true); |
| 1952 | if (ret) |
| 1953 | mem_cgroup_cancel_charge(parent); |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1954 | put_back: |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1955 | putback_lru_page(page); |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1956 | put: |
Daisuke Nishimura | 40d5813 | 2009-01-15 13:51:12 -0800 | [diff] [blame] | 1957 | put_page(page); |
Daisuke Nishimura | 57f9fd7d | 2009-12-15 16:47:11 -0800 | [diff] [blame] | 1958 | out: |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1959 | return ret; |
| 1960 | } |
| 1961 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1962 | /* |
| 1963 | * Charge the memory controller for page usage. |
| 1964 | * Return |
| 1965 | * 0 if the charge was successful |
| 1966 | * < 0 if the cgroup is over its limit |
| 1967 | */ |
| 1968 | static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, |
| 1969 | gfp_t gfp_mask, enum charge_type ctype, |
| 1970 | struct mem_cgroup *memcg) |
| 1971 | { |
| 1972 | struct mem_cgroup *mem; |
| 1973 | struct page_cgroup *pc; |
| 1974 | int ret; |
| 1975 | |
| 1976 | pc = lookup_page_cgroup(page); |
| 1977 | /* can happen at boot */ |
| 1978 | if (unlikely(!pc)) |
| 1979 | return 0; |
| 1980 | prefetchw(pc); |
| 1981 | |
| 1982 | mem = memcg; |
KAMEZAWA Hiroyuki | 430e4863 | 2010-03-10 15:22:30 -0800 | [diff] [blame] | 1983 | ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true); |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1984 | if (ret || !mem) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1985 | return ret; |
| 1986 | |
| 1987 | __mem_cgroup_commit_charge(mem, pc, ctype); |
| 1988 | return 0; |
| 1989 | } |
| 1990 | |
| 1991 | int mem_cgroup_newpage_charge(struct page *page, |
| 1992 | struct mm_struct *mm, gfp_t gfp_mask) |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 1993 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1994 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 1995 | return 0; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1996 | if (PageCompound(page)) |
| 1997 | return 0; |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1998 | /* |
| 1999 | * If already mapped, we don't have to account. |
| 2000 | * If page cache, page->mapping has address_space. |
| 2001 | * But page->mapping may have out-of-use anon_vma pointer, |
| 2002 | * detecit it by PageAnon() check. newly-mapped-anon's page->mapping |
| 2003 | * is NULL. |
| 2004 | */ |
| 2005 | if (page_mapped(page) || (page->mapping && !PageAnon(page))) |
| 2006 | return 0; |
| 2007 | if (unlikely(!mm)) |
| 2008 | mm = &init_mm; |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 2009 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2010 | MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL); |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 2011 | } |
| 2012 | |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2013 | static void |
| 2014 | __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr, |
| 2015 | enum charge_type ctype); |
| 2016 | |
Balbir Singh | e1a1cd5 | 2008-02-07 00:14:02 -0800 | [diff] [blame] | 2017 | int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, |
| 2018 | gfp_t gfp_mask) |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2019 | { |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2020 | struct mem_cgroup *mem = NULL; |
| 2021 | int ret; |
| 2022 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2023 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 2024 | return 0; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2025 | if (PageCompound(page)) |
| 2026 | return 0; |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2027 | /* |
| 2028 | * Corner case handling. This is called from add_to_page_cache() |
| 2029 | * in usual. But some FS (shmem) precharges this page before calling it |
| 2030 | * and call add_to_page_cache() with GFP_NOWAIT. |
| 2031 | * |
| 2032 | * For GFP_NOWAIT case, the page may be pre-charged before calling |
| 2033 | * add_to_page_cache(). (See shmem.c) check it here and avoid to call |
| 2034 | * charge twice. (It works but has to pay a bit larger cost.) |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2035 | * And when the page is SwapCache, it should take swap information |
| 2036 | * into account. This is under lock_page() now. |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2037 | */ |
| 2038 | if (!(gfp_mask & __GFP_WAIT)) { |
| 2039 | struct page_cgroup *pc; |
| 2040 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2041 | |
| 2042 | pc = lookup_page_cgroup(page); |
| 2043 | if (!pc) |
| 2044 | return 0; |
| 2045 | lock_page_cgroup(pc); |
| 2046 | if (PageCgroupUsed(pc)) { |
| 2047 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2048 | return 0; |
| 2049 | } |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2050 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2051 | } |
| 2052 | |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2053 | if (unlikely(!mm && !mem)) |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2054 | mm = &init_mm; |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 2055 | |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 2056 | if (page_is_file_cache(page)) |
| 2057 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2058 | MEM_CGROUP_CHARGE_TYPE_CACHE, NULL); |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2059 | |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2060 | /* shmem */ |
| 2061 | if (PageSwapCache(page)) { |
| 2062 | ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem); |
| 2063 | if (!ret) |
| 2064 | __mem_cgroup_commit_charge_swapin(page, mem, |
| 2065 | MEM_CGROUP_CHARGE_TYPE_SHMEM); |
| 2066 | } else |
| 2067 | ret = mem_cgroup_charge_common(page, mm, gfp_mask, |
| 2068 | MEM_CGROUP_CHARGE_TYPE_SHMEM, mem); |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2069 | |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2070 | return ret; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2071 | } |
| 2072 | |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2073 | /* |
| 2074 | * While swap-in, try_charge -> commit or cancel, the page is locked. |
| 2075 | * And when try_charge() successfully returns, one refcnt to memcg without |
Uwe Kleine-König | 21ae295 | 2009-10-07 15:21:09 +0200 | [diff] [blame] | 2076 | * struct page_cgroup is acquired. This refcnt will be consumed by |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2077 | * "commit()" or removed by "cancel()" |
| 2078 | */ |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2079 | int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
| 2080 | struct page *page, |
| 2081 | gfp_t mask, struct mem_cgroup **ptr) |
| 2082 | { |
| 2083 | struct mem_cgroup *mem; |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2084 | int ret; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2085 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2086 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2087 | return 0; |
| 2088 | |
| 2089 | if (!do_swap_account) |
| 2090 | goto charge_cur_mm; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2091 | /* |
| 2092 | * A racing thread's fault, or swapoff, may have already updated |
Hugh Dickins | 407f9c8 | 2009-12-14 17:59:30 -0800 | [diff] [blame] | 2093 | * the pte, and even removed page from swap cache: in those cases |
| 2094 | * do_swap_page()'s pte_same() test will fail; but there's also a |
| 2095 | * KSM case which does need to charge the page. |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2096 | */ |
| 2097 | if (!PageSwapCache(page)) |
Hugh Dickins | 407f9c8 | 2009-12-14 17:59:30 -0800 | [diff] [blame] | 2098 | goto charge_cur_mm; |
Wu Fengguang | e42d9d5 | 2009-12-16 12:19:59 +0100 | [diff] [blame] | 2099 | mem = try_get_mem_cgroup_from_page(page); |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2100 | if (!mem) |
| 2101 | goto charge_cur_mm; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2102 | *ptr = mem; |
KAMEZAWA Hiroyuki | 430e4863 | 2010-03-10 15:22:30 -0800 | [diff] [blame] | 2103 | ret = __mem_cgroup_try_charge(NULL, mask, ptr, true); |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 2104 | /* drop extra refcnt from tryget */ |
| 2105 | css_put(&mem->css); |
| 2106 | return ret; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2107 | charge_cur_mm: |
| 2108 | if (unlikely(!mm)) |
| 2109 | mm = &init_mm; |
KAMEZAWA Hiroyuki | 430e4863 | 2010-03-10 15:22:30 -0800 | [diff] [blame] | 2110 | return __mem_cgroup_try_charge(mm, mask, ptr, true); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2111 | } |
| 2112 | |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2113 | static void |
| 2114 | __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr, |
| 2115 | enum charge_type ctype) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2116 | { |
| 2117 | struct page_cgroup *pc; |
| 2118 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2119 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2120 | return; |
| 2121 | if (!ptr) |
| 2122 | return; |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2123 | cgroup_exclude_rmdir(&ptr->css); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2124 | pc = lookup_page_cgroup(page); |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 2125 | mem_cgroup_lru_del_before_commit_swapcache(page); |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2126 | __mem_cgroup_commit_charge(ptr, pc, ctype); |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 2127 | mem_cgroup_lru_add_after_commit_swapcache(page); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2128 | /* |
| 2129 | * Now swap is on-memory. This means this page may be |
| 2130 | * counted both as mem and swap....double count. |
KAMEZAWA Hiroyuki | 03f3c43 | 2009-01-07 18:08:31 -0800 | [diff] [blame] | 2131 | * Fix it by uncharging from memsw. Basically, this SwapCache is stable |
| 2132 | * under lock_page(). But in do_swap_page()::memory.c, reuse_swap_page() |
| 2133 | * may call delete_from_swap_cache() before reach here. |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2134 | */ |
KAMEZAWA Hiroyuki | 03f3c43 | 2009-01-07 18:08:31 -0800 | [diff] [blame] | 2135 | if (do_swap_account && PageSwapCache(page)) { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2136 | swp_entry_t ent = {.val = page_private(page)}; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2137 | unsigned short id; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2138 | struct mem_cgroup *memcg; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2139 | |
| 2140 | id = swap_cgroup_record(ent, 0); |
| 2141 | rcu_read_lock(); |
| 2142 | memcg = mem_cgroup_lookup(id); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2143 | if (memcg) { |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2144 | /* |
| 2145 | * This recorded memcg can be obsolete one. So, avoid |
| 2146 | * calling css_tryget |
| 2147 | */ |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2148 | if (!mem_cgroup_is_root(memcg)) |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 2149 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2150 | mem_cgroup_swap_statistics(memcg, false); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2151 | mem_cgroup_put(memcg); |
| 2152 | } |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2153 | rcu_read_unlock(); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2154 | } |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2155 | /* |
| 2156 | * At swapin, we may charge account against cgroup which has no tasks. |
| 2157 | * So, rmdir()->pre_destroy() can be called while we do this charge. |
| 2158 | * In that case, we need to call pre_destroy() again. check it here. |
| 2159 | */ |
| 2160 | cgroup_release_and_wakeup_rmdir(&ptr->css); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2161 | } |
| 2162 | |
Daisuke Nishimura | 83aae4c | 2009-04-02 16:57:48 -0700 | [diff] [blame] | 2163 | void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr) |
| 2164 | { |
| 2165 | __mem_cgroup_commit_charge_swapin(page, ptr, |
| 2166 | MEM_CGROUP_CHARGE_TYPE_MAPPED); |
| 2167 | } |
| 2168 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2169 | void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem) |
| 2170 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2171 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2172 | return; |
| 2173 | if (!mem) |
| 2174 | return; |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 2175 | mem_cgroup_cancel_charge(mem); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2176 | } |
| 2177 | |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2178 | static void |
| 2179 | __do_uncharge(struct mem_cgroup *mem, const enum charge_type ctype) |
| 2180 | { |
| 2181 | struct memcg_batch_info *batch = NULL; |
| 2182 | bool uncharge_memsw = true; |
| 2183 | /* If swapout, usage of swap doesn't decrease */ |
| 2184 | if (!do_swap_account || ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) |
| 2185 | uncharge_memsw = false; |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2186 | |
| 2187 | batch = ¤t->memcg_batch; |
| 2188 | /* |
| 2189 | * In usual, we do css_get() when we remember memcg pointer. |
| 2190 | * But in this case, we keep res->usage until end of a series of |
| 2191 | * uncharges. Then, it's ok to ignore memcg's refcnt. |
| 2192 | */ |
| 2193 | if (!batch->memcg) |
| 2194 | batch->memcg = mem; |
| 2195 | /* |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2196 | * do_batch > 0 when unmapping pages or inode invalidate/truncate. |
| 2197 | * In those cases, all pages freed continously can be expected to be in |
| 2198 | * the same cgroup and we have chance to coalesce uncharges. |
| 2199 | * But we do uncharge one by one if this is killed by OOM(TIF_MEMDIE) |
| 2200 | * because we want to do uncharge as soon as possible. |
| 2201 | */ |
| 2202 | |
| 2203 | if (!batch->do_batch || test_thread_flag(TIF_MEMDIE)) |
| 2204 | goto direct_uncharge; |
| 2205 | |
| 2206 | /* |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2207 | * In typical case, batch->memcg == mem. This means we can |
| 2208 | * merge a series of uncharges to an uncharge of res_counter. |
| 2209 | * If not, we uncharge res_counter ony by one. |
| 2210 | */ |
| 2211 | if (batch->memcg != mem) |
| 2212 | goto direct_uncharge; |
| 2213 | /* remember freed charge and uncharge it later */ |
| 2214 | batch->bytes += PAGE_SIZE; |
| 2215 | if (uncharge_memsw) |
| 2216 | batch->memsw_bytes += PAGE_SIZE; |
| 2217 | return; |
| 2218 | direct_uncharge: |
| 2219 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
| 2220 | if (uncharge_memsw) |
| 2221 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2222 | if (unlikely(batch->memcg != mem)) |
| 2223 | memcg_oom_recover(mem); |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2224 | return; |
| 2225 | } |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2226 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2227 | /* |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2228 | * uncharge if !page_mapped(page) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2229 | */ |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2230 | static struct mem_cgroup * |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2231 | __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2232 | { |
Hugh Dickins | 8289546 | 2008-03-04 14:29:08 -0800 | [diff] [blame] | 2233 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2234 | struct mem_cgroup *mem = NULL; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 2235 | struct mem_cgroup_per_zone *mz; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2236 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2237 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2238 | return NULL; |
Balbir Singh | 4077960 | 2008-04-04 14:29:59 -0700 | [diff] [blame] | 2239 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2240 | if (PageSwapCache(page)) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2241 | return NULL; |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2242 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2243 | /* |
Balbir Singh | 3c541e1 | 2008-02-07 00:14:41 -0800 | [diff] [blame] | 2244 | * Check if our page_cgroup is valid |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 2245 | */ |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2246 | pc = lookup_page_cgroup(page); |
| 2247 | if (unlikely(!pc || !PageCgroupUsed(pc))) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2248 | return NULL; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2249 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2250 | lock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2251 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2252 | mem = pc->mem_cgroup; |
| 2253 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2254 | if (!PageCgroupUsed(pc)) |
| 2255 | goto unlock_out; |
| 2256 | |
| 2257 | switch (ctype) { |
| 2258 | case MEM_CGROUP_CHARGE_TYPE_MAPPED: |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2259 | case MEM_CGROUP_CHARGE_TYPE_DROP: |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2260 | /* See mem_cgroup_prepare_migration() */ |
| 2261 | if (page_mapped(page) || PageCgroupMigration(pc)) |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2262 | goto unlock_out; |
| 2263 | break; |
| 2264 | case MEM_CGROUP_CHARGE_TYPE_SWAPOUT: |
| 2265 | if (!PageAnon(page)) { /* Shared memory */ |
| 2266 | if (page->mapping && !page_is_file_cache(page)) |
| 2267 | goto unlock_out; |
| 2268 | } else if (page_mapped(page)) /* Anon */ |
| 2269 | goto unlock_out; |
| 2270 | break; |
| 2271 | default: |
| 2272 | break; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2273 | } |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2274 | |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2275 | if (!mem_cgroup_is_root(mem)) |
| 2276 | __do_uncharge(mem, ctype); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2277 | if (ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT) |
| 2278 | mem_cgroup_swap_statistics(mem, true); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2279 | mem_cgroup_charge_statistics(mem, pc, false); |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 2280 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2281 | ClearPageCgroupUsed(pc); |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 2282 | /* |
| 2283 | * pc->mem_cgroup is not cleared here. It will be accessed when it's |
| 2284 | * freed from LRU. This is safe because uncharged page is expected not |
| 2285 | * to be reused (freed soon). Exception is SwapCache, it's handled by |
| 2286 | * special functions. |
| 2287 | */ |
Hugh Dickins | b9c565d | 2008-03-04 14:29:11 -0800 | [diff] [blame] | 2288 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2289 | mz = page_cgroup_zoneinfo(pc); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2290 | unlock_page_cgroup(pc); |
Hugh Dickins | fb59e9f | 2008-03-04 14:29:16 -0800 | [diff] [blame] | 2291 | |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 2292 | memcg_check_events(mem, page); |
KAMEZAWA Hiroyuki | a7fe942 | 2009-01-07 18:08:13 -0800 | [diff] [blame] | 2293 | /* at swapout, this memcg will be accessed to record to swap */ |
| 2294 | if (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT) |
| 2295 | css_put(&mem->css); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2296 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2297 | return mem; |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2298 | |
| 2299 | unlock_out: |
| 2300 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2301 | return NULL; |
Balbir Singh | 3c541e1 | 2008-02-07 00:14:41 -0800 | [diff] [blame] | 2302 | } |
| 2303 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2304 | void mem_cgroup_uncharge_page(struct page *page) |
| 2305 | { |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2306 | /* early check. */ |
| 2307 | if (page_mapped(page)) |
| 2308 | return; |
| 2309 | if (page->mapping && !PageAnon(page)) |
| 2310 | return; |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2311 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED); |
| 2312 | } |
| 2313 | |
| 2314 | void mem_cgroup_uncharge_cache_page(struct page *page) |
| 2315 | { |
| 2316 | VM_BUG_ON(page_mapped(page)); |
KAMEZAWA Hiroyuki | b7abea9 | 2008-10-18 20:28:09 -0700 | [diff] [blame] | 2317 | VM_BUG_ON(page->mapping); |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2318 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE); |
| 2319 | } |
| 2320 | |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2321 | /* |
| 2322 | * Batch_start/batch_end is called in unmap_page_range/invlidate/trucate. |
| 2323 | * In that cases, pages are freed continuously and we can expect pages |
| 2324 | * are in the same memcg. All these calls itself limits the number of |
| 2325 | * pages freed at once, then uncharge_start/end() is called properly. |
| 2326 | * This may be called prural(2) times in a context, |
| 2327 | */ |
| 2328 | |
| 2329 | void mem_cgroup_uncharge_start(void) |
| 2330 | { |
| 2331 | current->memcg_batch.do_batch++; |
| 2332 | /* We can do nest. */ |
| 2333 | if (current->memcg_batch.do_batch == 1) { |
| 2334 | current->memcg_batch.memcg = NULL; |
| 2335 | current->memcg_batch.bytes = 0; |
| 2336 | current->memcg_batch.memsw_bytes = 0; |
| 2337 | } |
| 2338 | } |
| 2339 | |
| 2340 | void mem_cgroup_uncharge_end(void) |
| 2341 | { |
| 2342 | struct memcg_batch_info *batch = ¤t->memcg_batch; |
| 2343 | |
| 2344 | if (!batch->do_batch) |
| 2345 | return; |
| 2346 | |
| 2347 | batch->do_batch--; |
| 2348 | if (batch->do_batch) /* If stacked, do nothing. */ |
| 2349 | return; |
| 2350 | |
| 2351 | if (!batch->memcg) |
| 2352 | return; |
| 2353 | /* |
| 2354 | * This "batch->memcg" is valid without any css_get/put etc... |
| 2355 | * bacause we hide charges behind us. |
| 2356 | */ |
| 2357 | if (batch->bytes) |
| 2358 | res_counter_uncharge(&batch->memcg->res, batch->bytes); |
| 2359 | if (batch->memsw_bytes) |
| 2360 | res_counter_uncharge(&batch->memcg->memsw, batch->memsw_bytes); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2361 | memcg_oom_recover(batch->memcg); |
KAMEZAWA Hiroyuki | 569b846 | 2009-12-15 16:47:03 -0800 | [diff] [blame] | 2362 | /* forget this pointer (for sanity check) */ |
| 2363 | batch->memcg = NULL; |
| 2364 | } |
| 2365 | |
Daisuke Nishimura | e767e05 | 2009-05-28 14:34:28 -0700 | [diff] [blame] | 2366 | #ifdef CONFIG_SWAP |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2367 | /* |
Daisuke Nishimura | e767e05 | 2009-05-28 14:34:28 -0700 | [diff] [blame] | 2368 | * called after __delete_from_swap_cache() and drop "page" account. |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2369 | * memcg information is recorded to swap_cgroup of "ent" |
| 2370 | */ |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2371 | void |
| 2372 | 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] | 2373 | { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2374 | struct mem_cgroup *memcg; |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2375 | int ctype = MEM_CGROUP_CHARGE_TYPE_SWAPOUT; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2376 | |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2377 | if (!swapout) /* this was a swap cache but the swap is unused ! */ |
| 2378 | ctype = MEM_CGROUP_CHARGE_TYPE_DROP; |
| 2379 | |
| 2380 | memcg = __mem_cgroup_uncharge_common(page, ctype); |
| 2381 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2382 | /* record memcg information */ |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2383 | if (do_swap_account && swapout && memcg) { |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2384 | swap_cgroup_record(ent, css_id(&memcg->css)); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2385 | mem_cgroup_get(memcg); |
| 2386 | } |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 2387 | if (swapout && memcg) |
KAMEZAWA Hiroyuki | a7fe942 | 2009-01-07 18:08:13 -0800 | [diff] [blame] | 2388 | css_put(&memcg->css); |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2389 | } |
Daisuke Nishimura | e767e05 | 2009-05-28 14:34:28 -0700 | [diff] [blame] | 2390 | #endif |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 2391 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2392 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 2393 | /* |
| 2394 | * called from swap_entry_free(). remove record in swap_cgroup and |
| 2395 | * uncharge "memsw" account. |
| 2396 | */ |
| 2397 | void mem_cgroup_uncharge_swap(swp_entry_t ent) |
| 2398 | { |
| 2399 | struct mem_cgroup *memcg; |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2400 | unsigned short id; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2401 | |
| 2402 | if (!do_swap_account) |
| 2403 | return; |
| 2404 | |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2405 | id = swap_cgroup_record(ent, 0); |
| 2406 | rcu_read_lock(); |
| 2407 | memcg = mem_cgroup_lookup(id); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2408 | if (memcg) { |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2409 | /* |
| 2410 | * We uncharge this because swap is freed. |
| 2411 | * This memcg can be obsolete one. We avoid calling css_tryget |
| 2412 | */ |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2413 | if (!mem_cgroup_is_root(memcg)) |
KAMEZAWA Hiroyuki | 4e64915 | 2009-10-01 15:44:11 -0700 | [diff] [blame] | 2414 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 2415 | mem_cgroup_swap_statistics(memcg, false); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2416 | mem_cgroup_put(memcg); |
| 2417 | } |
KAMEZAWA Hiroyuki | a3b2d69 | 2009-04-02 16:57:45 -0700 | [diff] [blame] | 2418 | rcu_read_unlock(); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2419 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2420 | |
| 2421 | /** |
| 2422 | * mem_cgroup_move_swap_account - move swap charge and swap_cgroup's record. |
| 2423 | * @entry: swap entry to be moved |
| 2424 | * @from: mem_cgroup which the entry is moved from |
| 2425 | * @to: mem_cgroup which the entry is moved to |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2426 | * @need_fixup: whether we should fixup res_counters and refcounts. |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2427 | * |
| 2428 | * It succeeds only when the swap_cgroup's record for this entry is the same |
| 2429 | * as the mem_cgroup's id of @from. |
| 2430 | * |
| 2431 | * Returns 0 on success, -EINVAL on failure. |
| 2432 | * |
| 2433 | * The caller must have charged to @to, IOW, called res_counter_charge() about |
| 2434 | * both res and memsw, and called css_get(). |
| 2435 | */ |
| 2436 | static int mem_cgroup_move_swap_account(swp_entry_t entry, |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2437 | struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2438 | { |
| 2439 | unsigned short old_id, new_id; |
| 2440 | |
| 2441 | old_id = css_id(&from->css); |
| 2442 | new_id = css_id(&to->css); |
| 2443 | |
| 2444 | if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2445 | mem_cgroup_swap_statistics(from, false); |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2446 | mem_cgroup_swap_statistics(to, true); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2447 | /* |
| 2448 | * This function is only called from task migration context now. |
| 2449 | * It postpones res_counter and refcount handling till the end |
| 2450 | * of task migration(mem_cgroup_clear_mc()) for performance |
| 2451 | * improvement. But we cannot postpone mem_cgroup_get(to) |
| 2452 | * because if the process that has been moved to @to does |
| 2453 | * swap-in, the refcount of @to might be decreased to 0. |
| 2454 | */ |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2455 | mem_cgroup_get(to); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2456 | if (need_fixup) { |
| 2457 | if (!mem_cgroup_is_root(from)) |
| 2458 | res_counter_uncharge(&from->memsw, PAGE_SIZE); |
| 2459 | mem_cgroup_put(from); |
| 2460 | /* |
| 2461 | * we charged both to->res and to->memsw, so we should |
| 2462 | * uncharge to->res. |
| 2463 | */ |
| 2464 | if (!mem_cgroup_is_root(to)) |
| 2465 | res_counter_uncharge(&to->res, PAGE_SIZE); |
| 2466 | css_put(&to->css); |
| 2467 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2468 | return 0; |
| 2469 | } |
| 2470 | return -EINVAL; |
| 2471 | } |
| 2472 | #else |
| 2473 | static inline int mem_cgroup_move_swap_account(swp_entry_t entry, |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 2474 | struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2475 | { |
| 2476 | return -EINVAL; |
| 2477 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2478 | #endif |
| 2479 | |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 2480 | /* |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2481 | * Before starting migration, account PAGE_SIZE to mem_cgroup that the old |
| 2482 | * page belongs to. |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 2483 | */ |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2484 | int mem_cgroup_prepare_migration(struct page *page, |
| 2485 | struct page *newpage, struct mem_cgroup **ptr) |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 2486 | { |
| 2487 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2488 | struct mem_cgroup *mem = NULL; |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2489 | enum charge_type ctype; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2490 | int ret = 0; |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 2491 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2492 | if (mem_cgroup_disabled()) |
Balbir Singh | 4077960 | 2008-04-04 14:29:59 -0700 | [diff] [blame] | 2493 | return 0; |
| 2494 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2495 | pc = lookup_page_cgroup(page); |
| 2496 | lock_page_cgroup(pc); |
| 2497 | if (PageCgroupUsed(pc)) { |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2498 | mem = pc->mem_cgroup; |
| 2499 | css_get(&mem->css); |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2500 | /* |
| 2501 | * At migrating an anonymous page, its mapcount goes down |
| 2502 | * to 0 and uncharge() will be called. But, even if it's fully |
| 2503 | * unmapped, migration may fail and this page has to be |
| 2504 | * charged again. We set MIGRATION flag here and delay uncharge |
| 2505 | * until end_migration() is called |
| 2506 | * |
| 2507 | * Corner Case Thinking |
| 2508 | * A) |
| 2509 | * When the old page was mapped as Anon and it's unmap-and-freed |
| 2510 | * while migration was ongoing. |
| 2511 | * If unmap finds the old page, uncharge() of it will be delayed |
| 2512 | * until end_migration(). If unmap finds a new page, it's |
| 2513 | * uncharged when it make mapcount to be 1->0. If unmap code |
| 2514 | * finds swap_migration_entry, the new page will not be mapped |
| 2515 | * and end_migration() will find it(mapcount==0). |
| 2516 | * |
| 2517 | * B) |
| 2518 | * When the old page was mapped but migraion fails, the kernel |
| 2519 | * remaps it. A charge for it is kept by MIGRATION flag even |
| 2520 | * if mapcount goes down to 0. We can do remap successfully |
| 2521 | * without charging it again. |
| 2522 | * |
| 2523 | * C) |
| 2524 | * The "old" page is under lock_page() until the end of |
| 2525 | * migration, so, the old page itself will not be swapped-out. |
| 2526 | * If the new page is swapped out before end_migraton, our |
| 2527 | * hook to usual swap-out path will catch the event. |
| 2528 | */ |
| 2529 | if (PageAnon(page)) |
| 2530 | SetPageCgroupMigration(pc); |
Hugh Dickins | b9c565d | 2008-03-04 14:29:11 -0800 | [diff] [blame] | 2531 | } |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2532 | unlock_page_cgroup(pc); |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2533 | /* |
| 2534 | * If the page is not charged at this point, |
| 2535 | * we return here. |
| 2536 | */ |
| 2537 | if (!mem) |
| 2538 | return 0; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2539 | |
Andrea Arcangeli | 93d5c9b | 2010-04-23 13:17:39 -0400 | [diff] [blame] | 2540 | *ptr = mem; |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2541 | ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, ptr, false); |
| 2542 | css_put(&mem->css);/* drop extra refcnt */ |
| 2543 | if (ret || *ptr == NULL) { |
| 2544 | if (PageAnon(page)) { |
| 2545 | lock_page_cgroup(pc); |
| 2546 | ClearPageCgroupMigration(pc); |
| 2547 | unlock_page_cgroup(pc); |
| 2548 | /* |
| 2549 | * The old page may be fully unmapped while we kept it. |
| 2550 | */ |
| 2551 | mem_cgroup_uncharge_page(page); |
| 2552 | } |
| 2553 | return -ENOMEM; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2554 | } |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2555 | /* |
| 2556 | * We charge new page before it's used/mapped. So, even if unlock_page() |
| 2557 | * is called before end_migration, we can catch all events on this new |
| 2558 | * page. In the case new page is migrated but not remapped, new page's |
| 2559 | * mapcount will be finally 0 and we call uncharge in end_migration(). |
| 2560 | */ |
| 2561 | pc = lookup_page_cgroup(newpage); |
| 2562 | if (PageAnon(page)) |
| 2563 | ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED; |
| 2564 | else if (page_is_file_cache(page)) |
| 2565 | ctype = MEM_CGROUP_CHARGE_TYPE_CACHE; |
| 2566 | else |
| 2567 | ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM; |
| 2568 | __mem_cgroup_commit_charge(mem, pc, ctype); |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2569 | return ret; |
| 2570 | } |
Hugh Dickins | fb59e9f | 2008-03-04 14:29:16 -0800 | [diff] [blame] | 2571 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2572 | /* remove redundant charge if migration failed*/ |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2573 | void mem_cgroup_end_migration(struct mem_cgroup *mem, |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2574 | struct page *oldpage, struct page *newpage) |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 2575 | { |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2576 | struct page *used, *unused; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2577 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2578 | |
| 2579 | if (!mem) |
| 2580 | return; |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2581 | /* blocks rmdir() */ |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2582 | cgroup_exclude_rmdir(&mem->css); |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2583 | /* at migration success, oldpage->mapping is NULL. */ |
| 2584 | if (oldpage->mapping) { |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2585 | used = oldpage; |
| 2586 | unused = newpage; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2587 | } else { |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2588 | used = newpage; |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2589 | unused = oldpage; |
| 2590 | } |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2591 | /* |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2592 | * We disallowed uncharge of pages under migration because mapcount |
| 2593 | * of the page goes down to zero, temporarly. |
| 2594 | * Clear the flag and check the page should be charged. |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 2595 | */ |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2596 | pc = lookup_page_cgroup(oldpage); |
| 2597 | lock_page_cgroup(pc); |
| 2598 | ClearPageCgroupMigration(pc); |
| 2599 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2600 | |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2601 | if (unused != oldpage) |
| 2602 | pc = lookup_page_cgroup(unused); |
| 2603 | __mem_cgroup_uncharge_common(unused, MEM_CGROUP_CHARGE_TYPE_FORCE); |
| 2604 | |
| 2605 | pc = lookup_page_cgroup(used); |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2606 | /* |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2607 | * If a page is a file cache, radix-tree replacement is very atomic |
| 2608 | * and we can skip this check. When it was an Anon page, its mapcount |
| 2609 | * goes down to 0. But because we added MIGRATION flage, it's not |
| 2610 | * uncharged yet. There are several case but page->mapcount check |
| 2611 | * and USED bit check in mem_cgroup_uncharge_page() will do enough |
| 2612 | * check. (see prepare_charge() also) |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 2613 | */ |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2614 | if (PageAnon(used)) |
| 2615 | mem_cgroup_uncharge_page(used); |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2616 | /* |
akpm@linux-foundation.org | ac39cf8 | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 2617 | * At migration, we may charge account against cgroup which has no |
| 2618 | * tasks. |
KAMEZAWA Hiroyuki | 8870326 | 2009-07-29 15:04:06 -0700 | [diff] [blame] | 2619 | * So, rmdir()->pre_destroy() can be called while we do this charge. |
| 2620 | * In that case, we need to call pre_destroy() again. check it here. |
| 2621 | */ |
| 2622 | cgroup_release_and_wakeup_rmdir(&mem->css); |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 2623 | } |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 2624 | |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2625 | /* |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 2626 | * A call to try to shrink memory usage on charge failure at shmem's swapin. |
| 2627 | * Calling hierarchical_reclaim is not enough because we should update |
| 2628 | * last_oom_jiffies to prevent pagefault_out_of_memory from invoking global OOM. |
| 2629 | * Moreover considering hierarchy, we should reclaim from the mem_over_limit, |
| 2630 | * not from the memcg which this page would be charged to. |
| 2631 | * try_charge_swapin does all of these works properly. |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 2632 | */ |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 2633 | int mem_cgroup_shmem_charge_fallback(struct page *page, |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2634 | struct mm_struct *mm, |
| 2635 | gfp_t gfp_mask) |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 2636 | { |
KAMEZAWA Hiroyuki | b5a8431 | 2009-01-07 18:08:35 -0800 | [diff] [blame] | 2637 | struct mem_cgroup *mem = NULL; |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 2638 | int ret; |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 2639 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2640 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 2641 | return 0; |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 2642 | |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 2643 | ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem); |
| 2644 | if (!ret) |
| 2645 | mem_cgroup_cancel_charge_swapin(mem); /* it does !mem check */ |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 2646 | |
Daisuke Nishimura | ae3abae | 2009-04-30 15:08:19 -0700 | [diff] [blame] | 2647 | return ret; |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 2648 | } |
| 2649 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2650 | static DEFINE_MUTEX(set_limit_mutex); |
| 2651 | |
KOSAKI Motohiro | d38d2a7 | 2009-01-06 14:39:44 -0800 | [diff] [blame] | 2652 | static int mem_cgroup_resize_limit(struct mem_cgroup *memcg, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2653 | unsigned long long val) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2654 | { |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2655 | int retry_count; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2656 | u64 memswlimit, memlimit; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2657 | int ret = 0; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2658 | int children = mem_cgroup_count_children(memcg); |
| 2659 | u64 curusage, oldusage; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2660 | int enlarge; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2661 | |
| 2662 | /* |
| 2663 | * For keeping hierarchical_reclaim simple, how long we should retry |
| 2664 | * is depends on callers. We set our retry-count to be function |
| 2665 | * of # of children which we should visit in this loop. |
| 2666 | */ |
| 2667 | retry_count = MEM_CGROUP_RECLAIM_RETRIES * children; |
| 2668 | |
| 2669 | oldusage = res_counter_read_u64(&memcg->res, RES_USAGE); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2670 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2671 | enlarge = 0; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2672 | while (retry_count) { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2673 | if (signal_pending(current)) { |
| 2674 | ret = -EINTR; |
| 2675 | break; |
| 2676 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2677 | /* |
| 2678 | * Rather than hide all in some function, I do this in |
| 2679 | * open coded manner. You see what this really does. |
| 2680 | * We have to guarantee mem->res.limit < mem->memsw.limit. |
| 2681 | */ |
| 2682 | mutex_lock(&set_limit_mutex); |
| 2683 | memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 2684 | if (memswlimit < val) { |
| 2685 | ret = -EINVAL; |
| 2686 | mutex_unlock(&set_limit_mutex); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2687 | break; |
| 2688 | } |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2689 | |
| 2690 | memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 2691 | if (memlimit < val) |
| 2692 | enlarge = 1; |
| 2693 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2694 | ret = res_counter_set_limit(&memcg->res, val); |
KAMEZAWA Hiroyuki | 22a668d | 2009-06-17 16:27:19 -0700 | [diff] [blame] | 2695 | if (!ret) { |
| 2696 | if (memswlimit == val) |
| 2697 | memcg->memsw_is_minimum = true; |
| 2698 | else |
| 2699 | memcg->memsw_is_minimum = false; |
| 2700 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2701 | mutex_unlock(&set_limit_mutex); |
| 2702 | |
| 2703 | if (!ret) |
| 2704 | break; |
| 2705 | |
Bob Liu | aa20d48 | 2009-12-15 16:47:14 -0800 | [diff] [blame] | 2706 | mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL, |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 2707 | MEM_CGROUP_RECLAIM_SHRINK); |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2708 | curusage = res_counter_read_u64(&memcg->res, RES_USAGE); |
| 2709 | /* Usage is reduced ? */ |
| 2710 | if (curusage >= oldusage) |
| 2711 | retry_count--; |
| 2712 | else |
| 2713 | oldusage = curusage; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2714 | } |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2715 | if (!ret && enlarge) |
| 2716 | memcg_oom_recover(memcg); |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 2717 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2718 | return ret; |
| 2719 | } |
| 2720 | |
Li Zefan | 338c843 | 2009-06-17 16:27:15 -0700 | [diff] [blame] | 2721 | static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg, |
| 2722 | unsigned long long val) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2723 | { |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2724 | int retry_count; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2725 | u64 memlimit, memswlimit, oldusage, curusage; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2726 | int children = mem_cgroup_count_children(memcg); |
| 2727 | int ret = -EBUSY; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2728 | int enlarge = 0; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2729 | |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2730 | /* see mem_cgroup_resize_res_limit */ |
| 2731 | retry_count = children * MEM_CGROUP_RECLAIM_RETRIES; |
| 2732 | oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2733 | while (retry_count) { |
| 2734 | if (signal_pending(current)) { |
| 2735 | ret = -EINTR; |
| 2736 | break; |
| 2737 | } |
| 2738 | /* |
| 2739 | * Rather than hide all in some function, I do this in |
| 2740 | * open coded manner. You see what this really does. |
| 2741 | * We have to guarantee mem->res.limit < mem->memsw.limit. |
| 2742 | */ |
| 2743 | mutex_lock(&set_limit_mutex); |
| 2744 | memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 2745 | if (memlimit > val) { |
| 2746 | ret = -EINVAL; |
| 2747 | mutex_unlock(&set_limit_mutex); |
| 2748 | break; |
| 2749 | } |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2750 | memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 2751 | if (memswlimit < val) |
| 2752 | enlarge = 1; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2753 | ret = res_counter_set_limit(&memcg->memsw, val); |
KAMEZAWA Hiroyuki | 22a668d | 2009-06-17 16:27:19 -0700 | [diff] [blame] | 2754 | if (!ret) { |
| 2755 | if (memlimit == val) |
| 2756 | memcg->memsw_is_minimum = true; |
| 2757 | else |
| 2758 | memcg->memsw_is_minimum = false; |
| 2759 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2760 | mutex_unlock(&set_limit_mutex); |
| 2761 | |
| 2762 | if (!ret) |
| 2763 | break; |
| 2764 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 2765 | mem_cgroup_hierarchical_reclaim(memcg, NULL, GFP_KERNEL, |
Balbir Singh | 75822b4 | 2009-09-23 15:56:38 -0700 | [diff] [blame] | 2766 | MEM_CGROUP_RECLAIM_NOSWAP | |
| 2767 | MEM_CGROUP_RECLAIM_SHRINK); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2768 | curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2769 | /* Usage is reduced ? */ |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2770 | if (curusage >= oldusage) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2771 | retry_count--; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2772 | else |
| 2773 | oldusage = curusage; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2774 | } |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2775 | if (!ret && enlarge) |
| 2776 | memcg_oom_recover(memcg); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2777 | return ret; |
| 2778 | } |
| 2779 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 2780 | unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, |
| 2781 | gfp_t gfp_mask, int nid, |
| 2782 | int zid) |
| 2783 | { |
| 2784 | unsigned long nr_reclaimed = 0; |
| 2785 | struct mem_cgroup_per_zone *mz, *next_mz = NULL; |
| 2786 | unsigned long reclaimed; |
| 2787 | int loop = 0; |
| 2788 | struct mem_cgroup_tree_per_zone *mctz; |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 2789 | unsigned long long excess; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 2790 | |
| 2791 | if (order > 0) |
| 2792 | return 0; |
| 2793 | |
| 2794 | mctz = soft_limit_tree_node_zone(nid, zid); |
| 2795 | /* |
| 2796 | * This loop can run a while, specially if mem_cgroup's continuously |
| 2797 | * keep exceeding their soft limit and putting the system under |
| 2798 | * pressure |
| 2799 | */ |
| 2800 | do { |
| 2801 | if (next_mz) |
| 2802 | mz = next_mz; |
| 2803 | else |
| 2804 | mz = mem_cgroup_largest_soft_limit_node(mctz); |
| 2805 | if (!mz) |
| 2806 | break; |
| 2807 | |
| 2808 | reclaimed = mem_cgroup_hierarchical_reclaim(mz->mem, zone, |
| 2809 | gfp_mask, |
| 2810 | MEM_CGROUP_RECLAIM_SOFT); |
| 2811 | nr_reclaimed += reclaimed; |
| 2812 | spin_lock(&mctz->lock); |
| 2813 | |
| 2814 | /* |
| 2815 | * If we failed to reclaim anything from this memory cgroup |
| 2816 | * it is time to move on to the next cgroup |
| 2817 | */ |
| 2818 | next_mz = NULL; |
| 2819 | if (!reclaimed) { |
| 2820 | do { |
| 2821 | /* |
| 2822 | * Loop until we find yet another one. |
| 2823 | * |
| 2824 | * By the time we get the soft_limit lock |
| 2825 | * again, someone might have aded the |
| 2826 | * group back on the RB tree. Iterate to |
| 2827 | * make sure we get a different mem. |
| 2828 | * mem_cgroup_largest_soft_limit_node returns |
| 2829 | * NULL if no other cgroup is present on |
| 2830 | * the tree |
| 2831 | */ |
| 2832 | next_mz = |
| 2833 | __mem_cgroup_largest_soft_limit_node(mctz); |
| 2834 | if (next_mz == mz) { |
| 2835 | css_put(&next_mz->mem->css); |
| 2836 | next_mz = NULL; |
| 2837 | } else /* next_mz == NULL or other memcg */ |
| 2838 | break; |
| 2839 | } while (1); |
| 2840 | } |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 2841 | __mem_cgroup_remove_exceeded(mz->mem, mz, mctz); |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 2842 | excess = res_counter_soft_limit_excess(&mz->mem->res); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 2843 | /* |
| 2844 | * One school of thought says that we should not add |
| 2845 | * back the node to the tree if reclaim returns 0. |
| 2846 | * But our reclaim could return 0, simply because due |
| 2847 | * to priority we are exposing a smaller subset of |
| 2848 | * memory to reclaim from. Consider this as a longer |
| 2849 | * term TODO. |
| 2850 | */ |
KAMEZAWA Hiroyuki | ef8745c | 2009-10-01 15:44:12 -0700 | [diff] [blame] | 2851 | /* If excess == 0, no tree ops */ |
| 2852 | __mem_cgroup_insert_exceeded(mz->mem, mz, mctz, excess); |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 2853 | spin_unlock(&mctz->lock); |
| 2854 | css_put(&mz->mem->css); |
| 2855 | loop++; |
| 2856 | /* |
| 2857 | * Could not reclaim anything and there are no more |
| 2858 | * mem cgroups to try or we seem to be looping without |
| 2859 | * reclaiming anything. |
| 2860 | */ |
| 2861 | if (!nr_reclaimed && |
| 2862 | (next_mz == NULL || |
| 2863 | loop > MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS)) |
| 2864 | break; |
| 2865 | } while (!nr_reclaimed); |
| 2866 | if (next_mz) |
| 2867 | css_put(&next_mz->mem->css); |
| 2868 | return nr_reclaimed; |
| 2869 | } |
| 2870 | |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 2871 | /* |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2872 | * This routine traverse page_cgroup in given list and drop them all. |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2873 | * *And* this routine doesn't reclaim page itself, just removes page_cgroup. |
| 2874 | */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2875 | static int mem_cgroup_force_empty_list(struct mem_cgroup *mem, |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2876 | int node, int zid, enum lru_list lru) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2877 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2878 | struct zone *zone; |
| 2879 | struct mem_cgroup_per_zone *mz; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2880 | struct page_cgroup *pc, *busy; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2881 | unsigned long flags, loop; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 2882 | struct list_head *list; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2883 | int ret = 0; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 2884 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2885 | zone = &NODE_DATA(node)->node_zones[zid]; |
| 2886 | mz = mem_cgroup_zoneinfo(mem, node, zid); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 2887 | list = &mz->lists[lru]; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2888 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2889 | loop = MEM_CGROUP_ZSTAT(mz, lru); |
| 2890 | /* give some margin against EBUSY etc...*/ |
| 2891 | loop += 256; |
| 2892 | busy = NULL; |
| 2893 | while (loop--) { |
| 2894 | ret = 0; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2895 | spin_lock_irqsave(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2896 | if (list_empty(list)) { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2897 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2898 | break; |
| 2899 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2900 | pc = list_entry(list->prev, struct page_cgroup, lru); |
| 2901 | if (busy == pc) { |
| 2902 | list_move(&pc->lru, list); |
Thiago Farina | 648bcc7 | 2010-03-05 13:42:04 -0800 | [diff] [blame] | 2903 | busy = NULL; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2904 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2905 | continue; |
| 2906 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2907 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2908 | |
KAMEZAWA Hiroyuki | 2c26fdd | 2009-01-07 18:08:10 -0800 | [diff] [blame] | 2909 | ret = mem_cgroup_move_parent(pc, mem, GFP_KERNEL); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2910 | if (ret == -ENOMEM) |
| 2911 | break; |
| 2912 | |
| 2913 | if (ret == -EBUSY || ret == -EINVAL) { |
| 2914 | /* found lock contention or "pc" is obsolete. */ |
| 2915 | busy = pc; |
| 2916 | cond_resched(); |
| 2917 | } else |
| 2918 | busy = NULL; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2919 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2920 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2921 | if (!ret && !list_empty(list)) |
| 2922 | return -EBUSY; |
| 2923 | return ret; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2924 | } |
| 2925 | |
| 2926 | /* |
| 2927 | * make mem_cgroup's charge to be 0 if there is no task. |
| 2928 | * This enables deleting this mem_cgroup. |
| 2929 | */ |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2930 | 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] | 2931 | { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2932 | int ret; |
| 2933 | int node, zid, shrink; |
| 2934 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2935 | struct cgroup *cgrp = mem->css.cgroup; |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 2936 | |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2937 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2938 | |
| 2939 | shrink = 0; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2940 | /* should free all ? */ |
| 2941 | if (free_all) |
| 2942 | goto try_to_free; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2943 | move_account: |
Daisuke Nishimura | fce6647 | 2010-01-15 17:01:30 -0800 | [diff] [blame] | 2944 | do { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2945 | ret = -EBUSY; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2946 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children)) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2947 | goto out; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2948 | ret = -EINTR; |
| 2949 | if (signal_pending(current)) |
| 2950 | goto out; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2951 | /* This is for making all *used* pages to be on LRU. */ |
| 2952 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 2953 | drain_all_stock_sync(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2954 | ret = 0; |
KAMEZAWA Hiroyuki | 299b4ea | 2009-01-29 14:25:17 -0800 | [diff] [blame] | 2955 | for_each_node_state(node, N_HIGH_MEMORY) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2956 | for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) { |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 2957 | enum lru_list l; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2958 | for_each_lru(l) { |
| 2959 | ret = mem_cgroup_force_empty_list(mem, |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2960 | node, zid, l); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2961 | if (ret) |
| 2962 | break; |
| 2963 | } |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 2964 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2965 | if (ret) |
| 2966 | break; |
| 2967 | } |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2968 | memcg_oom_recover(mem); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2969 | /* it seems parent cgroup doesn't have enough mem */ |
| 2970 | if (ret == -ENOMEM) |
| 2971 | goto try_to_free; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 2972 | cond_resched(); |
Daisuke Nishimura | fce6647 | 2010-01-15 17:01:30 -0800 | [diff] [blame] | 2973 | /* "ret" should also be checked to ensure all lists are empty. */ |
| 2974 | } while (mem->res.usage > 0 || ret); |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2975 | out: |
| 2976 | css_put(&mem->css); |
| 2977 | return ret; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2978 | |
| 2979 | try_to_free: |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2980 | /* returns EBUSY if there is a task or if we come here twice. */ |
| 2981 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children) || shrink) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2982 | ret = -EBUSY; |
| 2983 | goto out; |
| 2984 | } |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2985 | /* we call try-to-free pages for make this cgroup empty */ |
| 2986 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2987 | /* try to free all pages in this cgroup */ |
| 2988 | shrink = 1; |
| 2989 | while (nr_retries && mem->res.usage > 0) { |
| 2990 | int progress; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2991 | |
| 2992 | if (signal_pending(current)) { |
| 2993 | ret = -EINTR; |
| 2994 | goto out; |
| 2995 | } |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 2996 | progress = try_to_free_mem_cgroup_pages(mem, GFP_KERNEL, |
| 2997 | false, get_swappiness(mem)); |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2998 | if (!progress) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2999 | nr_retries--; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3000 | /* maybe some writeback is necessary */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 3001 | congestion_wait(BLK_RW_ASYNC, HZ/10); |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3002 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3003 | |
| 3004 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3005 | lru_add_drain(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3006 | /* try move_account...there may be some *locked* pages. */ |
Daisuke Nishimura | fce6647 | 2010-01-15 17:01:30 -0800 | [diff] [blame] | 3007 | goto move_account; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 3008 | } |
| 3009 | |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3010 | int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event) |
| 3011 | { |
| 3012 | return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true); |
| 3013 | } |
| 3014 | |
| 3015 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 3016 | static u64 mem_cgroup_hierarchy_read(struct cgroup *cont, struct cftype *cft) |
| 3017 | { |
| 3018 | return mem_cgroup_from_cont(cont)->use_hierarchy; |
| 3019 | } |
| 3020 | |
| 3021 | static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft, |
| 3022 | u64 val) |
| 3023 | { |
| 3024 | int retval = 0; |
| 3025 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
| 3026 | struct cgroup *parent = cont->parent; |
| 3027 | struct mem_cgroup *parent_mem = NULL; |
| 3028 | |
| 3029 | if (parent) |
| 3030 | parent_mem = mem_cgroup_from_cont(parent); |
| 3031 | |
| 3032 | cgroup_lock(); |
| 3033 | /* |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 3034 | * 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] | 3035 | * in the child subtrees. If it is unset, then the change can |
| 3036 | * occur, provided the current cgroup has no children. |
| 3037 | * |
| 3038 | * For the root cgroup, parent_mem is NULL, we allow value to be |
| 3039 | * set if there are no children. |
| 3040 | */ |
| 3041 | if ((!parent_mem || !parent_mem->use_hierarchy) && |
| 3042 | (val == 1 || val == 0)) { |
| 3043 | if (list_empty(&cont->children)) |
| 3044 | mem->use_hierarchy = val; |
| 3045 | else |
| 3046 | retval = -EBUSY; |
| 3047 | } else |
| 3048 | retval = -EINVAL; |
| 3049 | cgroup_unlock(); |
| 3050 | |
| 3051 | return retval; |
| 3052 | } |
| 3053 | |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3054 | struct mem_cgroup_idx_data { |
| 3055 | s64 val; |
| 3056 | enum mem_cgroup_stat_index idx; |
| 3057 | }; |
| 3058 | |
| 3059 | static int |
| 3060 | mem_cgroup_get_idx_stat(struct mem_cgroup *mem, void *data) |
| 3061 | { |
| 3062 | struct mem_cgroup_idx_data *d = data; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3063 | d->val += mem_cgroup_read_stat(mem, d->idx); |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3064 | return 0; |
| 3065 | } |
| 3066 | |
| 3067 | static void |
| 3068 | mem_cgroup_get_recursive_idx_stat(struct mem_cgroup *mem, |
| 3069 | enum mem_cgroup_stat_index idx, s64 *val) |
| 3070 | { |
| 3071 | struct mem_cgroup_idx_data d; |
| 3072 | d.idx = idx; |
| 3073 | d.val = 0; |
| 3074 | mem_cgroup_walk_tree(mem, &d, mem_cgroup_get_idx_stat); |
| 3075 | *val = d.val; |
| 3076 | } |
| 3077 | |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3078 | static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap) |
| 3079 | { |
| 3080 | u64 idx_val, val; |
| 3081 | |
| 3082 | if (!mem_cgroup_is_root(mem)) { |
| 3083 | if (!swap) |
| 3084 | return res_counter_read_u64(&mem->res, RES_USAGE); |
| 3085 | else |
| 3086 | return res_counter_read_u64(&mem->memsw, RES_USAGE); |
| 3087 | } |
| 3088 | |
| 3089 | mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_CACHE, &idx_val); |
| 3090 | val = idx_val; |
| 3091 | mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_RSS, &idx_val); |
| 3092 | val += idx_val; |
| 3093 | |
| 3094 | if (swap) { |
| 3095 | mem_cgroup_get_recursive_idx_stat(mem, |
| 3096 | MEM_CGROUP_STAT_SWAPOUT, &idx_val); |
| 3097 | val += idx_val; |
| 3098 | } |
| 3099 | |
| 3100 | return val << PAGE_SHIFT; |
| 3101 | } |
| 3102 | |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 3103 | static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3104 | { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3105 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3106 | u64 val; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3107 | int type, name; |
| 3108 | |
| 3109 | type = MEMFILE_TYPE(cft->private); |
| 3110 | name = MEMFILE_ATTR(cft->private); |
| 3111 | switch (type) { |
| 3112 | case _MEM: |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3113 | if (name == RES_USAGE) |
| 3114 | val = mem_cgroup_usage(mem, false); |
| 3115 | else |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3116 | val = res_counter_read_u64(&mem->res, name); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3117 | break; |
| 3118 | case _MEMSWAP: |
Kirill A. Shutemov | 104f392 | 2010-03-10 15:22:21 -0800 | [diff] [blame] | 3119 | if (name == RES_USAGE) |
| 3120 | val = mem_cgroup_usage(mem, true); |
| 3121 | else |
Balbir Singh | 0c3e73e | 2009-09-23 15:56:42 -0700 | [diff] [blame] | 3122 | val = res_counter_read_u64(&mem->memsw, name); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3123 | break; |
| 3124 | default: |
| 3125 | BUG(); |
| 3126 | break; |
| 3127 | } |
| 3128 | return val; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3129 | } |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3130 | /* |
| 3131 | * The user of this function is... |
| 3132 | * RES_LIMIT. |
| 3133 | */ |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 3134 | static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft, |
| 3135 | const char *buffer) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3136 | { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3137 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3138 | int type, name; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3139 | unsigned long long val; |
| 3140 | int ret; |
| 3141 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3142 | type = MEMFILE_TYPE(cft->private); |
| 3143 | name = MEMFILE_ATTR(cft->private); |
| 3144 | switch (name) { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3145 | case RES_LIMIT: |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 3146 | if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */ |
| 3147 | ret = -EINVAL; |
| 3148 | break; |
| 3149 | } |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3150 | /* This function does all necessary parse...reuse it */ |
| 3151 | ret = res_counter_memparse_write_strategy(buffer, &val); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3152 | if (ret) |
| 3153 | break; |
| 3154 | if (type == _MEM) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3155 | ret = mem_cgroup_resize_limit(memcg, val); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3156 | else |
| 3157 | ret = mem_cgroup_resize_memsw_limit(memcg, val); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3158 | break; |
Balbir Singh | 296c81d | 2009-09-23 15:56:36 -0700 | [diff] [blame] | 3159 | case RES_SOFT_LIMIT: |
| 3160 | ret = res_counter_memparse_write_strategy(buffer, &val); |
| 3161 | if (ret) |
| 3162 | break; |
| 3163 | /* |
| 3164 | * For memsw, soft limits are hard to implement in terms |
| 3165 | * of semantics, for now, we support soft limits for |
| 3166 | * control without swap |
| 3167 | */ |
| 3168 | if (type == _MEM) |
| 3169 | ret = res_counter_set_soft_limit(&memcg->res, val); |
| 3170 | else |
| 3171 | ret = -EINVAL; |
| 3172 | break; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3173 | default: |
| 3174 | ret = -EINVAL; /* should be BUG() ? */ |
| 3175 | break; |
| 3176 | } |
| 3177 | return ret; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3178 | } |
| 3179 | |
KAMEZAWA Hiroyuki | fee7b54 | 2009-01-07 18:08:26 -0800 | [diff] [blame] | 3180 | static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg, |
| 3181 | unsigned long long *mem_limit, unsigned long long *memsw_limit) |
| 3182 | { |
| 3183 | struct cgroup *cgroup; |
| 3184 | unsigned long long min_limit, min_memsw_limit, tmp; |
| 3185 | |
| 3186 | min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 3187 | min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 3188 | cgroup = memcg->css.cgroup; |
| 3189 | if (!memcg->use_hierarchy) |
| 3190 | goto out; |
| 3191 | |
| 3192 | while (cgroup->parent) { |
| 3193 | cgroup = cgroup->parent; |
| 3194 | memcg = mem_cgroup_from_cont(cgroup); |
| 3195 | if (!memcg->use_hierarchy) |
| 3196 | break; |
| 3197 | tmp = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 3198 | min_limit = min(min_limit, tmp); |
| 3199 | tmp = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 3200 | min_memsw_limit = min(min_memsw_limit, tmp); |
| 3201 | } |
| 3202 | out: |
| 3203 | *mem_limit = min_limit; |
| 3204 | *memsw_limit = min_memsw_limit; |
| 3205 | return; |
| 3206 | } |
| 3207 | |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3208 | static int mem_cgroup_reset(struct cgroup *cont, unsigned int event) |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3209 | { |
| 3210 | struct mem_cgroup *mem; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3211 | int type, name; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3212 | |
| 3213 | mem = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3214 | type = MEMFILE_TYPE(event); |
| 3215 | name = MEMFILE_ATTR(event); |
| 3216 | switch (name) { |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3217 | case RES_MAX_USAGE: |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3218 | if (type == _MEM) |
| 3219 | res_counter_reset_max(&mem->res); |
| 3220 | else |
| 3221 | res_counter_reset_max(&mem->memsw); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3222 | break; |
| 3223 | case RES_FAILCNT: |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3224 | if (type == _MEM) |
| 3225 | res_counter_reset_failcnt(&mem->res); |
| 3226 | else |
| 3227 | res_counter_reset_failcnt(&mem->memsw); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3228 | break; |
| 3229 | } |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 3230 | |
Pavel Emelyanov | 85cc59d | 2008-04-29 01:00:20 -0700 | [diff] [blame] | 3231 | return 0; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3232 | } |
| 3233 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3234 | static u64 mem_cgroup_move_charge_read(struct cgroup *cgrp, |
| 3235 | struct cftype *cft) |
| 3236 | { |
| 3237 | return mem_cgroup_from_cont(cgrp)->move_charge_at_immigrate; |
| 3238 | } |
| 3239 | |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 3240 | #ifdef CONFIG_MMU |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3241 | static int mem_cgroup_move_charge_write(struct cgroup *cgrp, |
| 3242 | struct cftype *cft, u64 val) |
| 3243 | { |
| 3244 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); |
| 3245 | |
| 3246 | if (val >= (1 << NR_MOVE_TYPE)) |
| 3247 | return -EINVAL; |
| 3248 | /* |
| 3249 | * We check this value several times in both in can_attach() and |
| 3250 | * attach(), so we need cgroup lock to prevent this value from being |
| 3251 | * inconsistent. |
| 3252 | */ |
| 3253 | cgroup_lock(); |
| 3254 | mem->move_charge_at_immigrate = val; |
| 3255 | cgroup_unlock(); |
| 3256 | |
| 3257 | return 0; |
| 3258 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 3259 | #else |
| 3260 | static int mem_cgroup_move_charge_write(struct cgroup *cgrp, |
| 3261 | struct cftype *cft, u64 val) |
| 3262 | { |
| 3263 | return -ENOSYS; |
| 3264 | } |
| 3265 | #endif |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3266 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3267 | |
| 3268 | /* For read statistics */ |
| 3269 | enum { |
| 3270 | MCS_CACHE, |
| 3271 | MCS_RSS, |
KAMEZAWA Hiroyuki | d804658 | 2009-12-15 16:47:09 -0800 | [diff] [blame] | 3272 | MCS_FILE_MAPPED, |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3273 | MCS_PGPGIN, |
| 3274 | MCS_PGPGOUT, |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3275 | MCS_SWAP, |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3276 | MCS_INACTIVE_ANON, |
| 3277 | MCS_ACTIVE_ANON, |
| 3278 | MCS_INACTIVE_FILE, |
| 3279 | MCS_ACTIVE_FILE, |
| 3280 | MCS_UNEVICTABLE, |
| 3281 | NR_MCS_STAT, |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3282 | }; |
| 3283 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3284 | struct mcs_total_stat { |
| 3285 | s64 stat[NR_MCS_STAT]; |
| 3286 | }; |
| 3287 | |
| 3288 | struct { |
| 3289 | char *local_name; |
| 3290 | char *total_name; |
| 3291 | } memcg_stat_strings[NR_MCS_STAT] = { |
| 3292 | {"cache", "total_cache"}, |
| 3293 | {"rss", "total_rss"}, |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 3294 | {"mapped_file", "total_mapped_file"}, |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3295 | {"pgpgin", "total_pgpgin"}, |
| 3296 | {"pgpgout", "total_pgpgout"}, |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3297 | {"swap", "total_swap"}, |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3298 | {"inactive_anon", "total_inactive_anon"}, |
| 3299 | {"active_anon", "total_active_anon"}, |
| 3300 | {"inactive_file", "total_inactive_file"}, |
| 3301 | {"active_file", "total_active_file"}, |
| 3302 | {"unevictable", "total_unevictable"} |
| 3303 | }; |
| 3304 | |
| 3305 | |
| 3306 | static int mem_cgroup_get_local_stat(struct mem_cgroup *mem, void *data) |
| 3307 | { |
| 3308 | struct mcs_total_stat *s = data; |
| 3309 | s64 val; |
| 3310 | |
| 3311 | /* per cpu stat */ |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3312 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3313 | s->stat[MCS_CACHE] += val * PAGE_SIZE; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3314 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3315 | s->stat[MCS_RSS] += val * PAGE_SIZE; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3316 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_FILE_MAPPED); |
KAMEZAWA Hiroyuki | d804658 | 2009-12-15 16:47:09 -0800 | [diff] [blame] | 3317 | s->stat[MCS_FILE_MAPPED] += val * PAGE_SIZE; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3318 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGIN_COUNT); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3319 | s->stat[MCS_PGPGIN] += val; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3320 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGOUT_COUNT); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3321 | s->stat[MCS_PGPGOUT] += val; |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3322 | if (do_swap_account) { |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3323 | val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_SWAPOUT); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3324 | s->stat[MCS_SWAP] += val * PAGE_SIZE; |
| 3325 | } |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3326 | |
| 3327 | /* per zone stat */ |
| 3328 | val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_ANON); |
| 3329 | s->stat[MCS_INACTIVE_ANON] += val * PAGE_SIZE; |
| 3330 | val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_ANON); |
| 3331 | s->stat[MCS_ACTIVE_ANON] += val * PAGE_SIZE; |
| 3332 | val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_FILE); |
| 3333 | s->stat[MCS_INACTIVE_FILE] += val * PAGE_SIZE; |
| 3334 | val = mem_cgroup_get_local_zonestat(mem, LRU_ACTIVE_FILE); |
| 3335 | s->stat[MCS_ACTIVE_FILE] += val * PAGE_SIZE; |
| 3336 | val = mem_cgroup_get_local_zonestat(mem, LRU_UNEVICTABLE); |
| 3337 | s->stat[MCS_UNEVICTABLE] += val * PAGE_SIZE; |
| 3338 | return 0; |
| 3339 | } |
| 3340 | |
| 3341 | static void |
| 3342 | mem_cgroup_get_total_stat(struct mem_cgroup *mem, struct mcs_total_stat *s) |
| 3343 | { |
| 3344 | mem_cgroup_walk_tree(mem, s, mem_cgroup_get_local_stat); |
| 3345 | } |
| 3346 | |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 3347 | static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft, |
| 3348 | struct cgroup_map_cb *cb) |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3349 | { |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3350 | struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3351 | struct mcs_total_stat mystat; |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3352 | int i; |
| 3353 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3354 | memset(&mystat, 0, sizeof(mystat)); |
| 3355 | mem_cgroup_get_local_stat(mem_cont, &mystat); |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3356 | |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3357 | for (i = 0; i < NR_MCS_STAT; i++) { |
| 3358 | if (i == MCS_SWAP && !do_swap_account) |
| 3359 | continue; |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3360 | cb->fill(cb, memcg_stat_strings[i].local_name, mystat.stat[i]); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3361 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 3362 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3363 | /* Hierarchical information */ |
KAMEZAWA Hiroyuki | fee7b54 | 2009-01-07 18:08:26 -0800 | [diff] [blame] | 3364 | { |
| 3365 | unsigned long long limit, memsw_limit; |
| 3366 | memcg_get_hierarchical_limit(mem_cont, &limit, &memsw_limit); |
| 3367 | cb->fill(cb, "hierarchical_memory_limit", limit); |
| 3368 | if (do_swap_account) |
| 3369 | cb->fill(cb, "hierarchical_memsw_limit", memsw_limit); |
| 3370 | } |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3371 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3372 | memset(&mystat, 0, sizeof(mystat)); |
| 3373 | mem_cgroup_get_total_stat(mem_cont, &mystat); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3374 | for (i = 0; i < NR_MCS_STAT; i++) { |
| 3375 | if (i == MCS_SWAP && !do_swap_account) |
| 3376 | continue; |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3377 | cb->fill(cb, memcg_stat_strings[i].total_name, mystat.stat[i]); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3378 | } |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3379 | |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3380 | #ifdef CONFIG_DEBUG_VM |
KOSAKI Motohiro | c772be9 | 2009-01-07 18:08:25 -0800 | [diff] [blame] | 3381 | cb->fill(cb, "inactive_ratio", calc_inactive_ratio(mem_cont, NULL)); |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3382 | |
| 3383 | { |
| 3384 | int nid, zid; |
| 3385 | struct mem_cgroup_per_zone *mz; |
| 3386 | unsigned long recent_rotated[2] = {0, 0}; |
| 3387 | unsigned long recent_scanned[2] = {0, 0}; |
| 3388 | |
| 3389 | for_each_online_node(nid) |
| 3390 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { |
| 3391 | mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
| 3392 | |
| 3393 | recent_rotated[0] += |
| 3394 | mz->reclaim_stat.recent_rotated[0]; |
| 3395 | recent_rotated[1] += |
| 3396 | mz->reclaim_stat.recent_rotated[1]; |
| 3397 | recent_scanned[0] += |
| 3398 | mz->reclaim_stat.recent_scanned[0]; |
| 3399 | recent_scanned[1] += |
| 3400 | mz->reclaim_stat.recent_scanned[1]; |
| 3401 | } |
| 3402 | cb->fill(cb, "recent_rotated_anon", recent_rotated[0]); |
| 3403 | cb->fill(cb, "recent_rotated_file", recent_rotated[1]); |
| 3404 | cb->fill(cb, "recent_scanned_anon", recent_scanned[0]); |
| 3405 | cb->fill(cb, "recent_scanned_file", recent_scanned[1]); |
| 3406 | } |
| 3407 | #endif |
| 3408 | |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3409 | return 0; |
| 3410 | } |
| 3411 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3412 | static u64 mem_cgroup_swappiness_read(struct cgroup *cgrp, struct cftype *cft) |
| 3413 | { |
| 3414 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
| 3415 | |
| 3416 | return get_swappiness(memcg); |
| 3417 | } |
| 3418 | |
| 3419 | static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft, |
| 3420 | u64 val) |
| 3421 | { |
| 3422 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
| 3423 | struct mem_cgroup *parent; |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3424 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3425 | if (val > 100) |
| 3426 | return -EINVAL; |
| 3427 | |
| 3428 | if (cgrp->parent == NULL) |
| 3429 | return -EINVAL; |
| 3430 | |
| 3431 | parent = mem_cgroup_from_cont(cgrp->parent); |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3432 | |
| 3433 | cgroup_lock(); |
| 3434 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3435 | /* If under hierarchy, only empty-root can set this value */ |
| 3436 | if ((parent->use_hierarchy) || |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3437 | (memcg->use_hierarchy && !list_empty(&cgrp->children))) { |
| 3438 | cgroup_unlock(); |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3439 | return -EINVAL; |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3440 | } |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3441 | |
| 3442 | spin_lock(&memcg->reclaim_param_lock); |
| 3443 | memcg->swappiness = val; |
| 3444 | spin_unlock(&memcg->reclaim_param_lock); |
| 3445 | |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3446 | cgroup_unlock(); |
| 3447 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3448 | return 0; |
| 3449 | } |
| 3450 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3451 | static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap) |
| 3452 | { |
| 3453 | struct mem_cgroup_threshold_ary *t; |
| 3454 | u64 usage; |
| 3455 | int i; |
| 3456 | |
| 3457 | rcu_read_lock(); |
| 3458 | if (!swap) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3459 | t = rcu_dereference(memcg->thresholds.primary); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3460 | else |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3461 | t = rcu_dereference(memcg->memsw_thresholds.primary); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3462 | |
| 3463 | if (!t) |
| 3464 | goto unlock; |
| 3465 | |
| 3466 | usage = mem_cgroup_usage(memcg, swap); |
| 3467 | |
| 3468 | /* |
| 3469 | * current_threshold points to threshold just below usage. |
| 3470 | * If it's not true, a threshold was crossed after last |
| 3471 | * call of __mem_cgroup_threshold(). |
| 3472 | */ |
Phil Carmody | 5407a56 | 2010-05-26 14:42:42 -0700 | [diff] [blame] | 3473 | i = t->current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3474 | |
| 3475 | /* |
| 3476 | * Iterate backward over array of thresholds starting from |
| 3477 | * current_threshold and check if a threshold is crossed. |
| 3478 | * If none of thresholds below usage is crossed, we read |
| 3479 | * only one element of the array here. |
| 3480 | */ |
| 3481 | for (; i >= 0 && unlikely(t->entries[i].threshold > usage); i--) |
| 3482 | eventfd_signal(t->entries[i].eventfd, 1); |
| 3483 | |
| 3484 | /* i = current_threshold + 1 */ |
| 3485 | i++; |
| 3486 | |
| 3487 | /* |
| 3488 | * Iterate forward over array of thresholds starting from |
| 3489 | * current_threshold+1 and check if a threshold is crossed. |
| 3490 | * If none of thresholds above usage is crossed, we read |
| 3491 | * only one element of the array here. |
| 3492 | */ |
| 3493 | for (; i < t->size && unlikely(t->entries[i].threshold <= usage); i++) |
| 3494 | eventfd_signal(t->entries[i].eventfd, 1); |
| 3495 | |
| 3496 | /* Update current_threshold */ |
Phil Carmody | 5407a56 | 2010-05-26 14:42:42 -0700 | [diff] [blame] | 3497 | t->current_threshold = i - 1; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3498 | unlock: |
| 3499 | rcu_read_unlock(); |
| 3500 | } |
| 3501 | |
| 3502 | static void mem_cgroup_threshold(struct mem_cgroup *memcg) |
| 3503 | { |
| 3504 | __mem_cgroup_threshold(memcg, false); |
| 3505 | if (do_swap_account) |
| 3506 | __mem_cgroup_threshold(memcg, true); |
| 3507 | } |
| 3508 | |
| 3509 | static int compare_thresholds(const void *a, const void *b) |
| 3510 | { |
| 3511 | const struct mem_cgroup_threshold *_a = a; |
| 3512 | const struct mem_cgroup_threshold *_b = b; |
| 3513 | |
| 3514 | return _a->threshold - _b->threshold; |
| 3515 | } |
| 3516 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3517 | static int mem_cgroup_oom_notify_cb(struct mem_cgroup *mem, void *data) |
| 3518 | { |
| 3519 | struct mem_cgroup_eventfd_list *ev; |
| 3520 | |
| 3521 | list_for_each_entry(ev, &mem->oom_notify, list) |
| 3522 | eventfd_signal(ev->eventfd, 1); |
| 3523 | return 0; |
| 3524 | } |
| 3525 | |
| 3526 | static void mem_cgroup_oom_notify(struct mem_cgroup *mem) |
| 3527 | { |
| 3528 | mem_cgroup_walk_tree(mem, NULL, mem_cgroup_oom_notify_cb); |
| 3529 | } |
| 3530 | |
| 3531 | static int mem_cgroup_usage_register_event(struct cgroup *cgrp, |
| 3532 | struct cftype *cft, struct eventfd_ctx *eventfd, const char *args) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3533 | { |
| 3534 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3535 | struct mem_cgroup_thresholds *thresholds; |
| 3536 | struct mem_cgroup_threshold_ary *new; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3537 | int type = MEMFILE_TYPE(cft->private); |
| 3538 | u64 threshold, usage; |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3539 | int i, size, ret; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3540 | |
| 3541 | ret = res_counter_memparse_write_strategy(args, &threshold); |
| 3542 | if (ret) |
| 3543 | return ret; |
| 3544 | |
| 3545 | mutex_lock(&memcg->thresholds_lock); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3546 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3547 | if (type == _MEM) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3548 | thresholds = &memcg->thresholds; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3549 | else if (type == _MEMSWAP) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3550 | thresholds = &memcg->memsw_thresholds; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3551 | else |
| 3552 | BUG(); |
| 3553 | |
| 3554 | usage = mem_cgroup_usage(memcg, type == _MEMSWAP); |
| 3555 | |
| 3556 | /* Check if a threshold crossed before adding a new one */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3557 | if (thresholds->primary) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3558 | __mem_cgroup_threshold(memcg, type == _MEMSWAP); |
| 3559 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3560 | size = thresholds->primary ? thresholds->primary->size + 1 : 1; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3561 | |
| 3562 | /* Allocate memory for new array of thresholds */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3563 | new = kmalloc(sizeof(*new) + size * sizeof(struct mem_cgroup_threshold), |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3564 | GFP_KERNEL); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3565 | if (!new) { |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3566 | ret = -ENOMEM; |
| 3567 | goto unlock; |
| 3568 | } |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3569 | new->size = size; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3570 | |
| 3571 | /* Copy thresholds (if any) to new array */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3572 | if (thresholds->primary) { |
| 3573 | memcpy(new->entries, thresholds->primary->entries, (size - 1) * |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3574 | sizeof(struct mem_cgroup_threshold)); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3575 | } |
| 3576 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3577 | /* Add new threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3578 | new->entries[size - 1].eventfd = eventfd; |
| 3579 | new->entries[size - 1].threshold = threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3580 | |
| 3581 | /* Sort thresholds. Registering of new threshold isn't time-critical */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3582 | sort(new->entries, size, sizeof(struct mem_cgroup_threshold), |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3583 | compare_thresholds, NULL); |
| 3584 | |
| 3585 | /* Find current threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3586 | new->current_threshold = -1; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3587 | for (i = 0; i < size; i++) { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3588 | if (new->entries[i].threshold < usage) { |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3589 | /* |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3590 | * new->current_threshold will not be used until |
| 3591 | * rcu_assign_pointer(), so it's safe to increment |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3592 | * it here. |
| 3593 | */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3594 | ++new->current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3595 | } |
| 3596 | } |
| 3597 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3598 | /* Free old spare buffer and save old primary buffer as spare */ |
| 3599 | kfree(thresholds->spare); |
| 3600 | thresholds->spare = thresholds->primary; |
| 3601 | |
| 3602 | rcu_assign_pointer(thresholds->primary, new); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3603 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3604 | /* To be sure that nobody uses thresholds */ |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3605 | synchronize_rcu(); |
| 3606 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3607 | unlock: |
| 3608 | mutex_unlock(&memcg->thresholds_lock); |
| 3609 | |
| 3610 | return ret; |
| 3611 | } |
| 3612 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3613 | static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3614 | struct cftype *cft, struct eventfd_ctx *eventfd) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3615 | { |
| 3616 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3617 | struct mem_cgroup_thresholds *thresholds; |
| 3618 | struct mem_cgroup_threshold_ary *new; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3619 | int type = MEMFILE_TYPE(cft->private); |
| 3620 | u64 usage; |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3621 | int i, j, size; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3622 | |
| 3623 | mutex_lock(&memcg->thresholds_lock); |
| 3624 | if (type == _MEM) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3625 | thresholds = &memcg->thresholds; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3626 | else if (type == _MEMSWAP) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3627 | thresholds = &memcg->memsw_thresholds; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3628 | else |
| 3629 | BUG(); |
| 3630 | |
| 3631 | /* |
| 3632 | * Something went wrong if we trying to unregister a threshold |
| 3633 | * if we don't have thresholds |
| 3634 | */ |
| 3635 | BUG_ON(!thresholds); |
| 3636 | |
| 3637 | usage = mem_cgroup_usage(memcg, type == _MEMSWAP); |
| 3638 | |
| 3639 | /* Check if a threshold crossed before removing */ |
| 3640 | __mem_cgroup_threshold(memcg, type == _MEMSWAP); |
| 3641 | |
| 3642 | /* Calculate new number of threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3643 | size = 0; |
| 3644 | for (i = 0; i < thresholds->primary->size; i++) { |
| 3645 | if (thresholds->primary->entries[i].eventfd != eventfd) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3646 | size++; |
| 3647 | } |
| 3648 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3649 | new = thresholds->spare; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3650 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3651 | /* Set thresholds array to NULL if we don't have thresholds */ |
| 3652 | if (!size) { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3653 | kfree(new); |
| 3654 | new = NULL; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3655 | goto swap_buffers; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3656 | } |
| 3657 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3658 | new->size = size; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3659 | |
| 3660 | /* Copy thresholds and find current threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3661 | new->current_threshold = -1; |
| 3662 | for (i = 0, j = 0; i < thresholds->primary->size; i++) { |
| 3663 | if (thresholds->primary->entries[i].eventfd == eventfd) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3664 | continue; |
| 3665 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3666 | new->entries[j] = thresholds->primary->entries[i]; |
| 3667 | if (new->entries[j].threshold < usage) { |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3668 | /* |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3669 | * new->current_threshold will not be used |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3670 | * until rcu_assign_pointer(), so it's safe to increment |
| 3671 | * it here. |
| 3672 | */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3673 | ++new->current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3674 | } |
| 3675 | j++; |
| 3676 | } |
| 3677 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3678 | swap_buffers: |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3679 | /* Swap primary and spare array */ |
| 3680 | thresholds->spare = thresholds->primary; |
| 3681 | rcu_assign_pointer(thresholds->primary, new); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3682 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3683 | /* To be sure that nobody uses thresholds */ |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3684 | synchronize_rcu(); |
| 3685 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3686 | mutex_unlock(&memcg->thresholds_lock); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3687 | } |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3688 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3689 | static int mem_cgroup_oom_register_event(struct cgroup *cgrp, |
| 3690 | struct cftype *cft, struct eventfd_ctx *eventfd, const char *args) |
| 3691 | { |
| 3692 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
| 3693 | struct mem_cgroup_eventfd_list *event; |
| 3694 | int type = MEMFILE_TYPE(cft->private); |
| 3695 | |
| 3696 | BUG_ON(type != _OOM_TYPE); |
| 3697 | event = kmalloc(sizeof(*event), GFP_KERNEL); |
| 3698 | if (!event) |
| 3699 | return -ENOMEM; |
| 3700 | |
| 3701 | mutex_lock(&memcg_oom_mutex); |
| 3702 | |
| 3703 | event->eventfd = eventfd; |
| 3704 | list_add(&event->list, &memcg->oom_notify); |
| 3705 | |
| 3706 | /* already in OOM ? */ |
| 3707 | if (atomic_read(&memcg->oom_lock)) |
| 3708 | eventfd_signal(eventfd, 1); |
| 3709 | mutex_unlock(&memcg_oom_mutex); |
| 3710 | |
| 3711 | return 0; |
| 3712 | } |
| 3713 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3714 | static void mem_cgroup_oom_unregister_event(struct cgroup *cgrp, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3715 | struct cftype *cft, struct eventfd_ctx *eventfd) |
| 3716 | { |
| 3717 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); |
| 3718 | struct mem_cgroup_eventfd_list *ev, *tmp; |
| 3719 | int type = MEMFILE_TYPE(cft->private); |
| 3720 | |
| 3721 | BUG_ON(type != _OOM_TYPE); |
| 3722 | |
| 3723 | mutex_lock(&memcg_oom_mutex); |
| 3724 | |
| 3725 | list_for_each_entry_safe(ev, tmp, &mem->oom_notify, list) { |
| 3726 | if (ev->eventfd == eventfd) { |
| 3727 | list_del(&ev->list); |
| 3728 | kfree(ev); |
| 3729 | } |
| 3730 | } |
| 3731 | |
| 3732 | mutex_unlock(&memcg_oom_mutex); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3733 | } |
| 3734 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3735 | static int mem_cgroup_oom_control_read(struct cgroup *cgrp, |
| 3736 | struct cftype *cft, struct cgroup_map_cb *cb) |
| 3737 | { |
| 3738 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); |
| 3739 | |
| 3740 | cb->fill(cb, "oom_kill_disable", mem->oom_kill_disable); |
| 3741 | |
| 3742 | if (atomic_read(&mem->oom_lock)) |
| 3743 | cb->fill(cb, "under_oom", 1); |
| 3744 | else |
| 3745 | cb->fill(cb, "under_oom", 0); |
| 3746 | return 0; |
| 3747 | } |
| 3748 | |
| 3749 | /* |
| 3750 | */ |
| 3751 | static int mem_cgroup_oom_control_write(struct cgroup *cgrp, |
| 3752 | struct cftype *cft, u64 val) |
| 3753 | { |
| 3754 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); |
| 3755 | struct mem_cgroup *parent; |
| 3756 | |
| 3757 | /* cannot set to root cgroup and only 0 and 1 are allowed */ |
| 3758 | if (!cgrp->parent || !((val == 0) || (val == 1))) |
| 3759 | return -EINVAL; |
| 3760 | |
| 3761 | parent = mem_cgroup_from_cont(cgrp->parent); |
| 3762 | |
| 3763 | cgroup_lock(); |
| 3764 | /* oom-kill-disable is a flag for subhierarchy. */ |
| 3765 | if ((parent->use_hierarchy) || |
| 3766 | (mem->use_hierarchy && !list_empty(&cgrp->children))) { |
| 3767 | cgroup_unlock(); |
| 3768 | return -EINVAL; |
| 3769 | } |
| 3770 | mem->oom_kill_disable = val; |
KAMEZAWA Hiroyuki | 4d845eb | 2010-06-29 15:05:18 -0700 | [diff] [blame] | 3771 | if (!val) |
| 3772 | memcg_oom_recover(mem); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3773 | cgroup_unlock(); |
| 3774 | return 0; |
| 3775 | } |
| 3776 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3777 | static struct cftype mem_cgroup_files[] = { |
| 3778 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 3779 | .name = "usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3780 | .private = MEMFILE_PRIVATE(_MEM, RES_USAGE), |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 3781 | .read_u64 = mem_cgroup_read, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3782 | .register_event = mem_cgroup_usage_register_event, |
| 3783 | .unregister_event = mem_cgroup_usage_unregister_event, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3784 | }, |
| 3785 | { |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3786 | .name = "max_usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3787 | .private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE), |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3788 | .trigger = mem_cgroup_reset, |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3789 | .read_u64 = mem_cgroup_read, |
| 3790 | }, |
| 3791 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 3792 | .name = "limit_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3793 | .private = MEMFILE_PRIVATE(_MEM, RES_LIMIT), |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 3794 | .write_string = mem_cgroup_write, |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 3795 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3796 | }, |
| 3797 | { |
Balbir Singh | 296c81d | 2009-09-23 15:56:36 -0700 | [diff] [blame] | 3798 | .name = "soft_limit_in_bytes", |
| 3799 | .private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT), |
| 3800 | .write_string = mem_cgroup_write, |
| 3801 | .read_u64 = mem_cgroup_read, |
| 3802 | }, |
| 3803 | { |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3804 | .name = "failcnt", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3805 | .private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT), |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3806 | .trigger = mem_cgroup_reset, |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 3807 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3808 | }, |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 3809 | { |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3810 | .name = "stat", |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 3811 | .read_map = mem_control_stat_show, |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3812 | }, |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3813 | { |
| 3814 | .name = "force_empty", |
| 3815 | .trigger = mem_cgroup_force_empty_write, |
| 3816 | }, |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 3817 | { |
| 3818 | .name = "use_hierarchy", |
| 3819 | .write_u64 = mem_cgroup_hierarchy_write, |
| 3820 | .read_u64 = mem_cgroup_hierarchy_read, |
| 3821 | }, |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3822 | { |
| 3823 | .name = "swappiness", |
| 3824 | .read_u64 = mem_cgroup_swappiness_read, |
| 3825 | .write_u64 = mem_cgroup_swappiness_write, |
| 3826 | }, |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3827 | { |
| 3828 | .name = "move_charge_at_immigrate", |
| 3829 | .read_u64 = mem_cgroup_move_charge_read, |
| 3830 | .write_u64 = mem_cgroup_move_charge_write, |
| 3831 | }, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3832 | { |
| 3833 | .name = "oom_control", |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3834 | .read_map = mem_cgroup_oom_control_read, |
| 3835 | .write_u64 = mem_cgroup_oom_control_write, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3836 | .register_event = mem_cgroup_oom_register_event, |
| 3837 | .unregister_event = mem_cgroup_oom_unregister_event, |
| 3838 | .private = MEMFILE_PRIVATE(_OOM_TYPE, OOM_CONTROL), |
| 3839 | }, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3840 | }; |
| 3841 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3842 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 3843 | static struct cftype memsw_cgroup_files[] = { |
| 3844 | { |
| 3845 | .name = "memsw.usage_in_bytes", |
| 3846 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE), |
| 3847 | .read_u64 = mem_cgroup_read, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3848 | .register_event = mem_cgroup_usage_register_event, |
| 3849 | .unregister_event = mem_cgroup_usage_unregister_event, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3850 | }, |
| 3851 | { |
| 3852 | .name = "memsw.max_usage_in_bytes", |
| 3853 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE), |
| 3854 | .trigger = mem_cgroup_reset, |
| 3855 | .read_u64 = mem_cgroup_read, |
| 3856 | }, |
| 3857 | { |
| 3858 | .name = "memsw.limit_in_bytes", |
| 3859 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT), |
| 3860 | .write_string = mem_cgroup_write, |
| 3861 | .read_u64 = mem_cgroup_read, |
| 3862 | }, |
| 3863 | { |
| 3864 | .name = "memsw.failcnt", |
| 3865 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT), |
| 3866 | .trigger = mem_cgroup_reset, |
| 3867 | .read_u64 = mem_cgroup_read, |
| 3868 | }, |
| 3869 | }; |
| 3870 | |
| 3871 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) |
| 3872 | { |
| 3873 | if (!do_swap_account) |
| 3874 | return 0; |
| 3875 | return cgroup_add_files(cont, ss, memsw_cgroup_files, |
| 3876 | ARRAY_SIZE(memsw_cgroup_files)); |
| 3877 | }; |
| 3878 | #else |
| 3879 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) |
| 3880 | { |
| 3881 | return 0; |
| 3882 | } |
| 3883 | #endif |
| 3884 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 3885 | static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
| 3886 | { |
| 3887 | struct mem_cgroup_per_node *pn; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 3888 | struct mem_cgroup_per_zone *mz; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 3889 | enum lru_list l; |
KAMEZAWA Hiroyuki | 41e3355 | 2008-04-08 17:41:54 -0700 | [diff] [blame] | 3890 | int zone, tmp = node; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 3891 | /* |
| 3892 | * This routine is called against possible nodes. |
| 3893 | * But it's BUG to call kmalloc() against offline node. |
| 3894 | * |
| 3895 | * TODO: this routine can waste much memory for nodes which will |
| 3896 | * never be onlined. It's better to use memory hotplug callback |
| 3897 | * function. |
| 3898 | */ |
KAMEZAWA Hiroyuki | 41e3355 | 2008-04-08 17:41:54 -0700 | [diff] [blame] | 3899 | if (!node_state(node, N_NORMAL_MEMORY)) |
| 3900 | tmp = -1; |
| 3901 | pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, tmp); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 3902 | if (!pn) |
| 3903 | return 1; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 3904 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 3905 | mem->info.nodeinfo[node] = pn; |
| 3906 | memset(pn, 0, sizeof(*pn)); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 3907 | |
| 3908 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { |
| 3909 | mz = &pn->zoneinfo[zone]; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 3910 | for_each_lru(l) |
| 3911 | INIT_LIST_HEAD(&mz->lists[l]); |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 3912 | mz->usage_in_excess = 0; |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 3913 | mz->on_tree = false; |
| 3914 | mz->mem = mem; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 3915 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 3916 | return 0; |
| 3917 | } |
| 3918 | |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 3919 | static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
| 3920 | { |
| 3921 | kfree(mem->info.nodeinfo[node]); |
| 3922 | } |
| 3923 | |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 3924 | static struct mem_cgroup *mem_cgroup_alloc(void) |
| 3925 | { |
| 3926 | struct mem_cgroup *mem; |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3927 | int size = sizeof(struct mem_cgroup); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 3928 | |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3929 | /* Can be very big if MAX_NUMNODES is very big */ |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3930 | if (size < PAGE_SIZE) |
| 3931 | mem = kmalloc(size, GFP_KERNEL); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 3932 | else |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 3933 | mem = vmalloc(size); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 3934 | |
Dan Carpenter | e7bbcdf | 2010-03-23 13:35:12 -0700 | [diff] [blame] | 3935 | if (!mem) |
| 3936 | return NULL; |
| 3937 | |
| 3938 | memset(mem, 0, size); |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3939 | mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu); |
| 3940 | if (!mem->stat) { |
| 3941 | if (size < PAGE_SIZE) |
| 3942 | kfree(mem); |
| 3943 | else |
| 3944 | vfree(mem); |
| 3945 | mem = NULL; |
| 3946 | } |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 3947 | return mem; |
| 3948 | } |
| 3949 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3950 | /* |
| 3951 | * At destroying mem_cgroup, references from swap_cgroup can remain. |
| 3952 | * (scanning all at force_empty is too costly...) |
| 3953 | * |
| 3954 | * Instead of clearing all references at force_empty, we remember |
| 3955 | * the number of reference from swap_cgroup and free mem_cgroup when |
| 3956 | * it goes down to 0. |
| 3957 | * |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3958 | * Removal of cgroup itself succeeds regardless of refs from swap. |
| 3959 | */ |
| 3960 | |
KAMEZAWA Hiroyuki | a7ba0ee | 2009-01-07 18:08:32 -0800 | [diff] [blame] | 3961 | static void __mem_cgroup_free(struct mem_cgroup *mem) |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 3962 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3963 | int node; |
| 3964 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 3965 | mem_cgroup_remove_from_trees(mem); |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 3966 | free_css_id(&mem_cgroup_subsys, &mem->css); |
| 3967 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 3968 | for_each_node_state(node, N_POSSIBLE) |
| 3969 | free_mem_cgroup_per_zone_info(mem, node); |
| 3970 | |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 3971 | free_percpu(mem->stat); |
| 3972 | if (sizeof(struct mem_cgroup) < PAGE_SIZE) |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 3973 | kfree(mem); |
| 3974 | else |
| 3975 | vfree(mem); |
| 3976 | } |
| 3977 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3978 | static void mem_cgroup_get(struct mem_cgroup *mem) |
| 3979 | { |
| 3980 | atomic_inc(&mem->refcnt); |
| 3981 | } |
| 3982 | |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 3983 | static void __mem_cgroup_put(struct mem_cgroup *mem, int count) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3984 | { |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 3985 | if (atomic_sub_and_test(count, &mem->refcnt)) { |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 3986 | struct mem_cgroup *parent = parent_mem_cgroup(mem); |
KAMEZAWA Hiroyuki | a7ba0ee | 2009-01-07 18:08:32 -0800 | [diff] [blame] | 3987 | __mem_cgroup_free(mem); |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 3988 | if (parent) |
| 3989 | mem_cgroup_put(parent); |
| 3990 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3991 | } |
| 3992 | |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 3993 | static void mem_cgroup_put(struct mem_cgroup *mem) |
| 3994 | { |
| 3995 | __mem_cgroup_put(mem, 1); |
| 3996 | } |
| 3997 | |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 3998 | /* |
| 3999 | * Returns the parent mem_cgroup in memcgroup hierarchy with hierarchy enabled. |
| 4000 | */ |
| 4001 | static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem) |
| 4002 | { |
| 4003 | if (!mem->res.parent) |
| 4004 | return NULL; |
| 4005 | return mem_cgroup_from_res_counter(mem->res.parent, res); |
| 4006 | } |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4007 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 4008 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 4009 | static void __init enable_swap_cgroup(void) |
| 4010 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 4011 | if (!mem_cgroup_disabled() && really_do_swap_account) |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 4012 | do_swap_account = 1; |
| 4013 | } |
| 4014 | #else |
| 4015 | static void __init enable_swap_cgroup(void) |
| 4016 | { |
| 4017 | } |
| 4018 | #endif |
| 4019 | |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 4020 | static int mem_cgroup_soft_limit_tree_init(void) |
| 4021 | { |
| 4022 | struct mem_cgroup_tree_per_node *rtpn; |
| 4023 | struct mem_cgroup_tree_per_zone *rtpz; |
| 4024 | int tmp, node, zone; |
| 4025 | |
| 4026 | for_each_node_state(node, N_POSSIBLE) { |
| 4027 | tmp = node; |
| 4028 | if (!node_state(node, N_NORMAL_MEMORY)) |
| 4029 | tmp = -1; |
| 4030 | rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp); |
| 4031 | if (!rtpn) |
| 4032 | return 1; |
| 4033 | |
| 4034 | soft_limit_tree.rb_tree_per_node[node] = rtpn; |
| 4035 | |
| 4036 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { |
| 4037 | rtpz = &rtpn->rb_tree_per_zone[zone]; |
| 4038 | rtpz->rb_root = RB_ROOT; |
| 4039 | spin_lock_init(&rtpz->lock); |
| 4040 | } |
| 4041 | } |
| 4042 | return 0; |
| 4043 | } |
| 4044 | |
Li Zefan | 0eb253e | 2009-01-15 13:51:25 -0800 | [diff] [blame] | 4045 | static struct cgroup_subsys_state * __ref |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4046 | mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) |
| 4047 | { |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4048 | struct mem_cgroup *mem, *parent; |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4049 | long error = -ENOMEM; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4050 | int node; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4051 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 4052 | mem = mem_cgroup_alloc(); |
| 4053 | if (!mem) |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4054 | return ERR_PTR(error); |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 4055 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4056 | for_each_node_state(node, N_POSSIBLE) |
| 4057 | if (alloc_mem_cgroup_per_zone_info(mem, node)) |
| 4058 | goto free_out; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 4059 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 4060 | /* root ? */ |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4061 | if (cont->parent == NULL) { |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 4062 | int cpu; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 4063 | enable_swap_cgroup(); |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4064 | parent = NULL; |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 4065 | root_mem_cgroup = mem; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 4066 | if (mem_cgroup_soft_limit_tree_init()) |
| 4067 | goto free_out; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 4068 | for_each_possible_cpu(cpu) { |
| 4069 | struct memcg_stock_pcp *stock = |
| 4070 | &per_cpu(memcg_stock, cpu); |
| 4071 | INIT_WORK(&stock->work, drain_local_stock); |
| 4072 | } |
| 4073 | hotcpu_notifier(memcg_stock_cpu_callback, 0); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4074 | } else { |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4075 | parent = mem_cgroup_from_cont(cont->parent); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4076 | mem->use_hierarchy = parent->use_hierarchy; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 4077 | mem->oom_kill_disable = parent->oom_kill_disable; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4078 | } |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4079 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4080 | if (parent && parent->use_hierarchy) { |
| 4081 | res_counter_init(&mem->res, &parent->res); |
| 4082 | res_counter_init(&mem->memsw, &parent->memsw); |
Daisuke Nishimura | 7bcc1bb | 2009-01-29 14:25:11 -0800 | [diff] [blame] | 4083 | /* |
| 4084 | * We increment refcnt of the parent to ensure that we can |
| 4085 | * safely access it on res_counter_charge/uncharge. |
| 4086 | * This refcnt will be decremented when freeing this |
| 4087 | * mem_cgroup(see mem_cgroup_put). |
| 4088 | */ |
| 4089 | mem_cgroup_get(parent); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4090 | } else { |
| 4091 | res_counter_init(&mem->res, NULL); |
| 4092 | res_counter_init(&mem->memsw, NULL); |
| 4093 | } |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4094 | mem->last_scanned_child = 0; |
KOSAKI Motohiro | 2733c06 | 2009-01-07 18:08:23 -0800 | [diff] [blame] | 4095 | spin_lock_init(&mem->reclaim_param_lock); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4096 | INIT_LIST_HEAD(&mem->oom_notify); |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 4097 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 4098 | if (parent) |
| 4099 | mem->swappiness = get_swappiness(parent); |
KAMEZAWA Hiroyuki | a7ba0ee | 2009-01-07 18:08:32 -0800 | [diff] [blame] | 4100 | atomic_set(&mem->refcnt, 1); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4101 | mem->move_charge_at_immigrate = 0; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 4102 | mutex_init(&mem->thresholds_lock); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4103 | return &mem->css; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4104 | free_out: |
KAMEZAWA Hiroyuki | a7ba0ee | 2009-01-07 18:08:32 -0800 | [diff] [blame] | 4105 | __mem_cgroup_free(mem); |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 4106 | root_mem_cgroup = NULL; |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4107 | return ERR_PTR(error); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4108 | } |
| 4109 | |
KAMEZAWA Hiroyuki | ec64f51 | 2009-04-02 16:57:26 -0700 | [diff] [blame] | 4110 | static int mem_cgroup_pre_destroy(struct cgroup_subsys *ss, |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 4111 | struct cgroup *cont) |
| 4112 | { |
| 4113 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | ec64f51 | 2009-04-02 16:57:26 -0700 | [diff] [blame] | 4114 | |
| 4115 | return mem_cgroup_force_empty(mem, false); |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 4116 | } |
| 4117 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4118 | static void mem_cgroup_destroy(struct cgroup_subsys *ss, |
| 4119 | struct cgroup *cont) |
| 4120 | { |
Daisuke Nishimura | c268e99 | 2009-01-15 13:51:13 -0800 | [diff] [blame] | 4121 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
Daisuke Nishimura | c268e99 | 2009-01-15 13:51:13 -0800 | [diff] [blame] | 4122 | |
Daisuke Nishimura | c268e99 | 2009-01-15 13:51:13 -0800 | [diff] [blame] | 4123 | mem_cgroup_put(mem); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4124 | } |
| 4125 | |
| 4126 | static int mem_cgroup_populate(struct cgroup_subsys *ss, |
| 4127 | struct cgroup *cont) |
| 4128 | { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4129 | int ret; |
| 4130 | |
| 4131 | ret = cgroup_add_files(cont, ss, mem_cgroup_files, |
| 4132 | ARRAY_SIZE(mem_cgroup_files)); |
| 4133 | |
| 4134 | if (!ret) |
| 4135 | ret = register_memsw_files(cont, ss); |
| 4136 | return ret; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4137 | } |
| 4138 | |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4139 | #ifdef CONFIG_MMU |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4140 | /* Handlers for move charge at task migration. */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4141 | #define PRECHARGE_COUNT_AT_ONCE 256 |
| 4142 | static int mem_cgroup_do_precharge(unsigned long count) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4143 | { |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4144 | int ret = 0; |
| 4145 | int batch_count = PRECHARGE_COUNT_AT_ONCE; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4146 | struct mem_cgroup *mem = mc.to; |
| 4147 | |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4148 | if (mem_cgroup_is_root(mem)) { |
| 4149 | mc.precharge += count; |
| 4150 | /* we don't need css_get for root */ |
| 4151 | return ret; |
| 4152 | } |
| 4153 | /* try to charge at once */ |
| 4154 | if (count > 1) { |
| 4155 | struct res_counter *dummy; |
| 4156 | /* |
| 4157 | * "mem" cannot be under rmdir() because we've already checked |
| 4158 | * by cgroup_lock_live_cgroup() that it is not removed and we |
| 4159 | * are still under the same cgroup_mutex. So we can postpone |
| 4160 | * css_get(). |
| 4161 | */ |
| 4162 | if (res_counter_charge(&mem->res, PAGE_SIZE * count, &dummy)) |
| 4163 | goto one_by_one; |
| 4164 | if (do_swap_account && res_counter_charge(&mem->memsw, |
| 4165 | PAGE_SIZE * count, &dummy)) { |
| 4166 | res_counter_uncharge(&mem->res, PAGE_SIZE * count); |
| 4167 | goto one_by_one; |
| 4168 | } |
| 4169 | mc.precharge += count; |
| 4170 | VM_BUG_ON(test_bit(CSS_ROOT, &mem->css.flags)); |
| 4171 | WARN_ON_ONCE(count > INT_MAX); |
| 4172 | __css_get(&mem->css, (int)count); |
| 4173 | return ret; |
| 4174 | } |
| 4175 | one_by_one: |
| 4176 | /* fall back to one by one charge */ |
| 4177 | while (count--) { |
| 4178 | if (signal_pending(current)) { |
| 4179 | ret = -EINTR; |
| 4180 | break; |
| 4181 | } |
| 4182 | if (!batch_count--) { |
| 4183 | batch_count = PRECHARGE_COUNT_AT_ONCE; |
| 4184 | cond_resched(); |
| 4185 | } |
KAMEZAWA Hiroyuki | 430e4863 | 2010-03-10 15:22:30 -0800 | [diff] [blame] | 4186 | ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4187 | if (ret || !mem) |
| 4188 | /* mem_cgroup_clear_mc() will do uncharge later */ |
| 4189 | return -ENOMEM; |
| 4190 | mc.precharge++; |
| 4191 | } |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4192 | return ret; |
| 4193 | } |
| 4194 | |
| 4195 | /** |
| 4196 | * is_target_pte_for_mc - check a pte whether it is valid for move charge |
| 4197 | * @vma: the vma the pte to be checked belongs |
| 4198 | * @addr: the address corresponding to the pte to be checked |
| 4199 | * @ptent: the pte to be checked |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4200 | * @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] | 4201 | * |
| 4202 | * Returns |
| 4203 | * 0(MC_TARGET_NONE): if the pte is not a target for move charge. |
| 4204 | * 1(MC_TARGET_PAGE): if the page corresponding to this pte is a target for |
| 4205 | * move charge. if @target is not NULL, the page is stored in target->page |
| 4206 | * with extra refcnt got(Callers should handle it). |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4207 | * 2(MC_TARGET_SWAP): if the swap entry corresponding to this pte is a |
| 4208 | * target for charge migration. if @target is not NULL, the entry is stored |
| 4209 | * in target->ent. |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4210 | * |
| 4211 | * Called with pte lock held. |
| 4212 | */ |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4213 | union mc_target { |
| 4214 | struct page *page; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4215 | swp_entry_t ent; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4216 | }; |
| 4217 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4218 | enum mc_target_type { |
| 4219 | MC_TARGET_NONE, /* not used */ |
| 4220 | MC_TARGET_PAGE, |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4221 | MC_TARGET_SWAP, |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4222 | }; |
| 4223 | |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4224 | static struct page *mc_handle_present_pte(struct vm_area_struct *vma, |
| 4225 | unsigned long addr, pte_t ptent) |
| 4226 | { |
| 4227 | struct page *page = vm_normal_page(vma, addr, ptent); |
| 4228 | |
| 4229 | if (!page || !page_mapped(page)) |
| 4230 | return NULL; |
| 4231 | if (PageAnon(page)) { |
| 4232 | /* we don't move shared anon */ |
| 4233 | if (!move_anon() || page_mapcount(page) > 2) |
| 4234 | return NULL; |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4235 | } else if (!move_file()) |
| 4236 | /* we ignore mapcount for file pages */ |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4237 | return NULL; |
| 4238 | if (!get_page_unless_zero(page)) |
| 4239 | return NULL; |
| 4240 | |
| 4241 | return page; |
| 4242 | } |
| 4243 | |
| 4244 | static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, |
| 4245 | unsigned long addr, pte_t ptent, swp_entry_t *entry) |
| 4246 | { |
| 4247 | int usage_count; |
| 4248 | struct page *page = NULL; |
| 4249 | swp_entry_t ent = pte_to_swp_entry(ptent); |
| 4250 | |
| 4251 | if (!move_anon() || non_swap_entry(ent)) |
| 4252 | return NULL; |
| 4253 | usage_count = mem_cgroup_count_swap_user(ent, &page); |
| 4254 | if (usage_count > 1) { /* we don't move shared anon */ |
| 4255 | if (page) |
| 4256 | put_page(page); |
| 4257 | return NULL; |
| 4258 | } |
| 4259 | if (do_swap_account) |
| 4260 | entry->val = ent.val; |
| 4261 | |
| 4262 | return page; |
| 4263 | } |
| 4264 | |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4265 | static struct page *mc_handle_file_pte(struct vm_area_struct *vma, |
| 4266 | unsigned long addr, pte_t ptent, swp_entry_t *entry) |
| 4267 | { |
| 4268 | struct page *page = NULL; |
| 4269 | struct inode *inode; |
| 4270 | struct address_space *mapping; |
| 4271 | pgoff_t pgoff; |
| 4272 | |
| 4273 | if (!vma->vm_file) /* anonymous vma */ |
| 4274 | return NULL; |
| 4275 | if (!move_file()) |
| 4276 | return NULL; |
| 4277 | |
| 4278 | inode = vma->vm_file->f_path.dentry->d_inode; |
| 4279 | mapping = vma->vm_file->f_mapping; |
| 4280 | if (pte_none(ptent)) |
| 4281 | pgoff = linear_page_index(vma, addr); |
| 4282 | else /* pte_file(ptent) is true */ |
| 4283 | pgoff = pte_to_pgoff(ptent); |
| 4284 | |
| 4285 | /* page is moved even if it's not RSS of this task(page-faulted). */ |
| 4286 | if (!mapping_cap_swap_backed(mapping)) { /* normal file */ |
| 4287 | page = find_get_page(mapping, pgoff); |
| 4288 | } else { /* shmem/tmpfs file. we should take account of swap too. */ |
| 4289 | swp_entry_t ent; |
| 4290 | mem_cgroup_get_shmem_target(inode, pgoff, &page, &ent); |
| 4291 | if (do_swap_account) |
| 4292 | entry->val = ent.val; |
| 4293 | } |
| 4294 | |
| 4295 | return page; |
| 4296 | } |
| 4297 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4298 | static int is_target_pte_for_mc(struct vm_area_struct *vma, |
| 4299 | unsigned long addr, pte_t ptent, union mc_target *target) |
| 4300 | { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4301 | struct page *page = NULL; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4302 | struct page_cgroup *pc; |
| 4303 | int ret = 0; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4304 | swp_entry_t ent = { .val = 0 }; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4305 | |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4306 | if (pte_present(ptent)) |
| 4307 | page = mc_handle_present_pte(vma, addr, ptent); |
| 4308 | else if (is_swap_pte(ptent)) |
| 4309 | page = mc_handle_swap_pte(vma, addr, ptent, &ent); |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4310 | else if (pte_none(ptent) || pte_file(ptent)) |
| 4311 | page = mc_handle_file_pte(vma, addr, ptent, &ent); |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4312 | |
| 4313 | if (!page && !ent.val) |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4314 | return 0; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4315 | if (page) { |
| 4316 | pc = lookup_page_cgroup(page); |
| 4317 | /* |
| 4318 | * Do only loose check w/o page_cgroup lock. |
| 4319 | * mem_cgroup_move_account() checks the pc is valid or not under |
| 4320 | * the lock. |
| 4321 | */ |
| 4322 | if (PageCgroupUsed(pc) && pc->mem_cgroup == mc.from) { |
| 4323 | ret = MC_TARGET_PAGE; |
| 4324 | if (target) |
| 4325 | target->page = page; |
| 4326 | } |
| 4327 | if (!ret || !target) |
| 4328 | put_page(page); |
| 4329 | } |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4330 | /* There is a swap entry and a page doesn't exist or isn't charged */ |
| 4331 | if (ent.val && !ret && |
KAMEZAWA Hiroyuki | 7f0f154 | 2010-05-11 14:06:58 -0700 | [diff] [blame] | 4332 | css_id(&mc.from->css) == lookup_swap_cgroup(ent)) { |
| 4333 | ret = MC_TARGET_SWAP; |
| 4334 | if (target) |
| 4335 | target->ent = ent; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4336 | } |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4337 | return ret; |
| 4338 | } |
| 4339 | |
| 4340 | static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd, |
| 4341 | unsigned long addr, unsigned long end, |
| 4342 | struct mm_walk *walk) |
| 4343 | { |
| 4344 | struct vm_area_struct *vma = walk->private; |
| 4345 | pte_t *pte; |
| 4346 | spinlock_t *ptl; |
| 4347 | |
| 4348 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
| 4349 | for (; addr != end; pte++, addr += PAGE_SIZE) |
| 4350 | if (is_target_pte_for_mc(vma, addr, *pte, NULL)) |
| 4351 | mc.precharge++; /* increment precharge temporarily */ |
| 4352 | pte_unmap_unlock(pte - 1, ptl); |
| 4353 | cond_resched(); |
| 4354 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4355 | return 0; |
| 4356 | } |
| 4357 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4358 | static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm) |
| 4359 | { |
| 4360 | unsigned long precharge; |
| 4361 | struct vm_area_struct *vma; |
| 4362 | |
| 4363 | down_read(&mm->mmap_sem); |
| 4364 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
| 4365 | struct mm_walk mem_cgroup_count_precharge_walk = { |
| 4366 | .pmd_entry = mem_cgroup_count_precharge_pte_range, |
| 4367 | .mm = mm, |
| 4368 | .private = vma, |
| 4369 | }; |
| 4370 | if (is_vm_hugetlb_page(vma)) |
| 4371 | continue; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4372 | walk_page_range(vma->vm_start, vma->vm_end, |
| 4373 | &mem_cgroup_count_precharge_walk); |
| 4374 | } |
| 4375 | up_read(&mm->mmap_sem); |
| 4376 | |
| 4377 | precharge = mc.precharge; |
| 4378 | mc.precharge = 0; |
| 4379 | |
| 4380 | return precharge; |
| 4381 | } |
| 4382 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4383 | static int mem_cgroup_precharge_mc(struct mm_struct *mm) |
| 4384 | { |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4385 | return mem_cgroup_do_precharge(mem_cgroup_count_precharge(mm)); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4386 | } |
| 4387 | |
| 4388 | static void mem_cgroup_clear_mc(void) |
| 4389 | { |
| 4390 | /* we must uncharge all the leftover precharges from mc.to */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4391 | if (mc.precharge) { |
| 4392 | __mem_cgroup_cancel_charge(mc.to, mc.precharge); |
| 4393 | mc.precharge = 0; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 4394 | memcg_oom_recover(mc.to); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4395 | } |
| 4396 | /* |
| 4397 | * we didn't uncharge from mc.from at mem_cgroup_move_account(), so |
| 4398 | * we must uncharge here. |
| 4399 | */ |
| 4400 | if (mc.moved_charge) { |
| 4401 | __mem_cgroup_cancel_charge(mc.from, mc.moved_charge); |
| 4402 | mc.moved_charge = 0; |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 4403 | memcg_oom_recover(mc.from); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4404 | } |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4405 | /* we must fixup refcnts and charges */ |
| 4406 | if (mc.moved_swap) { |
| 4407 | WARN_ON_ONCE(mc.moved_swap > INT_MAX); |
| 4408 | /* uncharge swap account from the old cgroup */ |
| 4409 | if (!mem_cgroup_is_root(mc.from)) |
| 4410 | res_counter_uncharge(&mc.from->memsw, |
| 4411 | PAGE_SIZE * mc.moved_swap); |
| 4412 | __mem_cgroup_put(mc.from, mc.moved_swap); |
| 4413 | |
| 4414 | if (!mem_cgroup_is_root(mc.to)) { |
| 4415 | /* |
| 4416 | * we charged both to->res and to->memsw, so we should |
| 4417 | * uncharge to->res. |
| 4418 | */ |
| 4419 | res_counter_uncharge(&mc.to->res, |
| 4420 | PAGE_SIZE * mc.moved_swap); |
| 4421 | VM_BUG_ON(test_bit(CSS_ROOT, &mc.to->css.flags)); |
| 4422 | __css_put(&mc.to->css, mc.moved_swap); |
| 4423 | } |
| 4424 | /* we've already done mem_cgroup_get(mc.to) */ |
| 4425 | |
| 4426 | mc.moved_swap = 0; |
| 4427 | } |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4428 | mc.from = NULL; |
| 4429 | mc.to = NULL; |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 4430 | mc.moving_task = NULL; |
| 4431 | wake_up_all(&mc.waitq); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4432 | } |
| 4433 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4434 | static int mem_cgroup_can_attach(struct cgroup_subsys *ss, |
| 4435 | struct cgroup *cgroup, |
| 4436 | struct task_struct *p, |
| 4437 | bool threadgroup) |
| 4438 | { |
| 4439 | int ret = 0; |
| 4440 | struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup); |
| 4441 | |
| 4442 | if (mem->move_charge_at_immigrate) { |
| 4443 | struct mm_struct *mm; |
| 4444 | struct mem_cgroup *from = mem_cgroup_from_task(p); |
| 4445 | |
| 4446 | VM_BUG_ON(from == mem); |
| 4447 | |
| 4448 | mm = get_task_mm(p); |
| 4449 | if (!mm) |
| 4450 | return 0; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4451 | /* We move charges only when we move a owner of the mm */ |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4452 | if (mm->owner == p) { |
| 4453 | VM_BUG_ON(mc.from); |
| 4454 | VM_BUG_ON(mc.to); |
| 4455 | VM_BUG_ON(mc.precharge); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4456 | VM_BUG_ON(mc.moved_charge); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4457 | VM_BUG_ON(mc.moved_swap); |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 4458 | VM_BUG_ON(mc.moving_task); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4459 | mc.from = from; |
| 4460 | mc.to = mem; |
| 4461 | mc.precharge = 0; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4462 | mc.moved_charge = 0; |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4463 | mc.moved_swap = 0; |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 4464 | mc.moving_task = current; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4465 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4466 | ret = mem_cgroup_precharge_mc(mm); |
| 4467 | if (ret) |
| 4468 | mem_cgroup_clear_mc(); |
| 4469 | } |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4470 | mmput(mm); |
| 4471 | } |
| 4472 | return ret; |
| 4473 | } |
| 4474 | |
| 4475 | static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, |
| 4476 | struct cgroup *cgroup, |
| 4477 | struct task_struct *p, |
| 4478 | bool threadgroup) |
| 4479 | { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4480 | mem_cgroup_clear_mc(); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4481 | } |
| 4482 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4483 | static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, |
| 4484 | unsigned long addr, unsigned long end, |
| 4485 | struct mm_walk *walk) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4486 | { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4487 | int ret = 0; |
| 4488 | struct vm_area_struct *vma = walk->private; |
| 4489 | pte_t *pte; |
| 4490 | spinlock_t *ptl; |
| 4491 | |
| 4492 | retry: |
| 4493 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
| 4494 | for (; addr != end; addr += PAGE_SIZE) { |
| 4495 | pte_t ptent = *(pte++); |
| 4496 | union mc_target target; |
| 4497 | int type; |
| 4498 | struct page *page; |
| 4499 | struct page_cgroup *pc; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4500 | swp_entry_t ent; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4501 | |
| 4502 | if (!mc.precharge) |
| 4503 | break; |
| 4504 | |
| 4505 | type = is_target_pte_for_mc(vma, addr, ptent, &target); |
| 4506 | switch (type) { |
| 4507 | case MC_TARGET_PAGE: |
| 4508 | page = target.page; |
| 4509 | if (isolate_lru_page(page)) |
| 4510 | goto put; |
| 4511 | pc = lookup_page_cgroup(page); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4512 | if (!mem_cgroup_move_account(pc, |
| 4513 | mc.from, mc.to, false)) { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4514 | mc.precharge--; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4515 | /* we uncharge from mc.from later. */ |
| 4516 | mc.moved_charge++; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4517 | } |
| 4518 | putback_lru_page(page); |
| 4519 | put: /* is_target_pte_for_mc() gets the page */ |
| 4520 | put_page(page); |
| 4521 | break; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4522 | case MC_TARGET_SWAP: |
| 4523 | ent = target.ent; |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4524 | if (!mem_cgroup_move_swap_account(ent, |
| 4525 | mc.from, mc.to, false)) { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4526 | mc.precharge--; |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4527 | /* we fixup refcnts and charges later. */ |
| 4528 | mc.moved_swap++; |
| 4529 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4530 | break; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4531 | default: |
| 4532 | break; |
| 4533 | } |
| 4534 | } |
| 4535 | pte_unmap_unlock(pte - 1, ptl); |
| 4536 | cond_resched(); |
| 4537 | |
| 4538 | if (addr != end) { |
| 4539 | /* |
| 4540 | * We have consumed all precharges we got in can_attach(). |
| 4541 | * We try charge one by one, but don't do any additional |
| 4542 | * charges to mc.to if we have failed in charge once in attach() |
| 4543 | * phase. |
| 4544 | */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4545 | ret = mem_cgroup_do_precharge(1); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4546 | if (!ret) |
| 4547 | goto retry; |
| 4548 | } |
| 4549 | |
| 4550 | return ret; |
| 4551 | } |
| 4552 | |
| 4553 | static void mem_cgroup_move_charge(struct mm_struct *mm) |
| 4554 | { |
| 4555 | struct vm_area_struct *vma; |
| 4556 | |
| 4557 | lru_add_drain_all(); |
| 4558 | down_read(&mm->mmap_sem); |
| 4559 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
| 4560 | int ret; |
| 4561 | struct mm_walk mem_cgroup_move_charge_walk = { |
| 4562 | .pmd_entry = mem_cgroup_move_charge_pte_range, |
| 4563 | .mm = mm, |
| 4564 | .private = vma, |
| 4565 | }; |
| 4566 | if (is_vm_hugetlb_page(vma)) |
| 4567 | continue; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4568 | ret = walk_page_range(vma->vm_start, vma->vm_end, |
| 4569 | &mem_cgroup_move_charge_walk); |
| 4570 | if (ret) |
| 4571 | /* |
| 4572 | * means we have consumed all precharges and failed in |
| 4573 | * doing additional charge. Just abandon here. |
| 4574 | */ |
| 4575 | break; |
| 4576 | } |
| 4577 | up_read(&mm->mmap_sem); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4578 | } |
| 4579 | |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 4580 | static void mem_cgroup_move_task(struct cgroup_subsys *ss, |
| 4581 | struct cgroup *cont, |
| 4582 | struct cgroup *old_cont, |
Ben Blum | be367d0 | 2009-09-23 15:56:31 -0700 | [diff] [blame] | 4583 | struct task_struct *p, |
| 4584 | bool threadgroup) |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 4585 | { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4586 | struct mm_struct *mm; |
| 4587 | |
| 4588 | if (!mc.to) |
| 4589 | /* no need to move charge */ |
| 4590 | return; |
| 4591 | |
| 4592 | mm = get_task_mm(p); |
| 4593 | if (mm) { |
| 4594 | mem_cgroup_move_charge(mm); |
| 4595 | mmput(mm); |
| 4596 | } |
| 4597 | mem_cgroup_clear_mc(); |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 4598 | } |
Daisuke Nishimura | 5cfb80a | 2010-03-23 13:35:11 -0700 | [diff] [blame] | 4599 | #else /* !CONFIG_MMU */ |
| 4600 | static int mem_cgroup_can_attach(struct cgroup_subsys *ss, |
| 4601 | struct cgroup *cgroup, |
| 4602 | struct task_struct *p, |
| 4603 | bool threadgroup) |
| 4604 | { |
| 4605 | return 0; |
| 4606 | } |
| 4607 | static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, |
| 4608 | struct cgroup *cgroup, |
| 4609 | struct task_struct *p, |
| 4610 | bool threadgroup) |
| 4611 | { |
| 4612 | } |
| 4613 | static void mem_cgroup_move_task(struct cgroup_subsys *ss, |
| 4614 | struct cgroup *cont, |
| 4615 | struct cgroup *old_cont, |
| 4616 | struct task_struct *p, |
| 4617 | bool threadgroup) |
| 4618 | { |
| 4619 | } |
| 4620 | #endif |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 4621 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4622 | struct cgroup_subsys mem_cgroup_subsys = { |
| 4623 | .name = "memory", |
| 4624 | .subsys_id = mem_cgroup_subsys_id, |
| 4625 | .create = mem_cgroup_create, |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 4626 | .pre_destroy = mem_cgroup_pre_destroy, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4627 | .destroy = mem_cgroup_destroy, |
| 4628 | .populate = mem_cgroup_populate, |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4629 | .can_attach = mem_cgroup_can_attach, |
| 4630 | .cancel_attach = mem_cgroup_cancel_attach, |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 4631 | .attach = mem_cgroup_move_task, |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4632 | .early_init = 0, |
KAMEZAWA Hiroyuki | 04046e1 | 2009-04-02 16:57:33 -0700 | [diff] [blame] | 4633 | .use_id = 1, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4634 | }; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 4635 | |
| 4636 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 4637 | |
| 4638 | static int __init disable_swap_account(char *s) |
| 4639 | { |
| 4640 | really_do_swap_account = 0; |
| 4641 | return 1; |
| 4642 | } |
| 4643 | __setup("noswapaccount", disable_swap_account); |
| 4644 | #endif |