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 | * |
Glauber Costa | 7ae1e1d | 2012-12-18 14:21:56 -0800 | [diff] [blame] | 13 | * Kernel Memory Controller |
| 14 | * Copyright (C) 2012 Parallels Inc. and Google Inc. |
| 15 | * Authors: Glauber Costa and Suleiman Souhlal |
| 16 | * |
Johannes Weiner | 1575e68 | 2015-04-14 15:44:51 -0700 | [diff] [blame] | 17 | * Native page reclaim |
| 18 | * Charge lifetime sanitation |
| 19 | * Lockless page tracking & accounting |
| 20 | * Unified hierarchy configuration model |
| 21 | * Copyright (C) 2015 Red Hat, Inc., Johannes Weiner |
| 22 | * |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 23 | * This program is free software; you can redistribute it and/or modify |
| 24 | * it under the terms of the GNU General Public License as published by |
| 25 | * the Free Software Foundation; either version 2 of the License, or |
| 26 | * (at your option) any later version. |
| 27 | * |
| 28 | * This program is distributed in the hope that it will be useful, |
| 29 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 30 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 31 | * GNU General Public License for more details. |
| 32 | */ |
| 33 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 34 | #include <linux/page_counter.h> |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 35 | #include <linux/memcontrol.h> |
| 36 | #include <linux/cgroup.h> |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 37 | #include <linux/mm.h> |
Ingo Molnar | 6e84f31 | 2017-02-08 18:51:29 +0100 | [diff] [blame] | 38 | #include <linux/sched/mm.h> |
Hugh Dickins | 3a4f8a0 | 2017-02-24 14:59:36 -0800 | [diff] [blame] | 39 | #include <linux/shmem_fs.h> |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 40 | #include <linux/hugetlb.h> |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 41 | #include <linux/pagemap.h> |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 42 | #include <linux/smp.h> |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 43 | #include <linux/page-flags.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 44 | #include <linux/backing-dev.h> |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 45 | #include <linux/bit_spinlock.h> |
| 46 | #include <linux/rcupdate.h> |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 47 | #include <linux/limits.h> |
Paul Gortmaker | b9e15ba | 2011-05-26 16:00:52 -0400 | [diff] [blame] | 48 | #include <linux/export.h> |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 49 | #include <linux/mutex.h> |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 50 | #include <linux/rbtree.h> |
Balbir Singh | b6ac57d | 2008-04-29 01:00:19 -0700 | [diff] [blame] | 51 | #include <linux/slab.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 52 | #include <linux/swap.h> |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 53 | #include <linux/swapops.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 54 | #include <linux/spinlock.h> |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 55 | #include <linux/eventfd.h> |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 56 | #include <linux/poll.h> |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 57 | #include <linux/sort.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 58 | #include <linux/fs.h> |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 59 | #include <linux/seq_file.h> |
Anton Vorontsov | 70ddf63 | 2013-04-29 15:08:31 -0700 | [diff] [blame] | 60 | #include <linux/vmpressure.h> |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 61 | #include <linux/mm_inline.h> |
Johannes Weiner | 5d1ea48 | 2014-12-10 15:44:55 -0800 | [diff] [blame] | 62 | #include <linux/swap_cgroup.h> |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 63 | #include <linux/cpu.h> |
KAMEZAWA Hiroyuki | 158e0a2 | 2010-08-10 18:03:00 -0700 | [diff] [blame] | 64 | #include <linux/oom.h> |
Johannes Weiner | 0056f4e | 2013-10-31 16:34:14 -0700 | [diff] [blame] | 65 | #include <linux/lockdep.h> |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 66 | #include <linux/file.h> |
Tejun Heo | b23afb9 | 2015-11-05 18:46:11 -0800 | [diff] [blame] | 67 | #include <linux/tracehook.h> |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 68 | #include "internal.h" |
Glauber Costa | d1a4c0b | 2011-12-11 21:47:04 +0000 | [diff] [blame] | 69 | #include <net/sock.h> |
Michal Hocko | 4bd2c1e | 2012-10-08 16:33:10 -0700 | [diff] [blame] | 70 | #include <net/ip.h> |
Qiang Huang | f35c3a8 | 2013-11-12 15:08:22 -0800 | [diff] [blame] | 71 | #include "slab.h" |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 72 | |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 73 | #include <linux/uaccess.h> |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 74 | |
KOSAKI Motohiro | cc8e970 | 2010-08-09 17:19:57 -0700 | [diff] [blame] | 75 | #include <trace/events/vmscan.h> |
| 76 | |
Tejun Heo | 073219e | 2014-02-08 10:36:58 -0500 | [diff] [blame] | 77 | struct cgroup_subsys memory_cgrp_subsys __read_mostly; |
| 78 | EXPORT_SYMBOL(memory_cgrp_subsys); |
David Rientjes | 68ae564 | 2012-12-12 13:51:57 -0800 | [diff] [blame] | 79 | |
Johannes Weiner | 7d82860 | 2016-01-14 15:20:56 -0800 | [diff] [blame] | 80 | struct mem_cgroup *root_mem_cgroup __read_mostly; |
| 81 | |
KAMEZAWA Hiroyuki | a181b0e | 2008-07-25 01:47:08 -0700 | [diff] [blame] | 82 | #define MEM_CGROUP_RECLAIM_RETRIES 5 |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 83 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 84 | /* Socket memory accounting disabled? */ |
| 85 | static bool cgroup_memory_nosocket; |
| 86 | |
Vladimir Davydov | 04823c8 | 2016-01-20 15:02:38 -0800 | [diff] [blame] | 87 | /* Kernel memory accounting disabled? */ |
| 88 | static bool cgroup_memory_nokmem; |
| 89 | |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 90 | /* Whether the swap controller is active */ |
Andrew Morton | c255a45 | 2012-07-31 16:43:02 -0700 | [diff] [blame] | 91 | #ifdef CONFIG_MEMCG_SWAP |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 92 | int do_swap_account __read_mostly; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 93 | #else |
Kirill A. Shutemov | a0db00f | 2012-05-29 15:06:56 -0700 | [diff] [blame] | 94 | #define do_swap_account 0 |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 95 | #endif |
| 96 | |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 97 | /* Whether legacy memory+swap accounting is active */ |
| 98 | static bool do_memsw_account(void) |
| 99 | { |
| 100 | return !cgroup_subsys_on_dfl(memory_cgrp_subsys) && do_swap_account; |
| 101 | } |
| 102 | |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 103 | static const char *const mem_cgroup_lru_names[] = { |
Sha Zhengju | 58cf188 | 2013-02-22 16:32:05 -0800 | [diff] [blame] | 104 | "inactive_anon", |
| 105 | "active_anon", |
| 106 | "inactive_file", |
| 107 | "active_file", |
| 108 | "unevictable", |
| 109 | }; |
| 110 | |
Kirill A. Shutemov | a0db00f | 2012-05-29 15:06:56 -0700 | [diff] [blame] | 111 | #define THRESHOLDS_EVENTS_TARGET 128 |
| 112 | #define SOFTLIMIT_EVENTS_TARGET 1024 |
| 113 | #define NUMAINFO_EVENTS_TARGET 1024 |
Johannes Weiner | e9f8974 | 2011-03-23 16:42:37 -0700 | [diff] [blame] | 114 | |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 115 | /* |
| 116 | * Cgroups above their limits are maintained in a RB-Tree, independent of |
| 117 | * their hierarchy representation |
| 118 | */ |
| 119 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 120 | struct mem_cgroup_tree_per_node { |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 121 | struct rb_root rb_root; |
Davidlohr Bueso | fa90b2f | 2017-09-08 16:15:21 -0700 | [diff] [blame] | 122 | struct rb_node *rb_rightmost; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 123 | spinlock_t lock; |
| 124 | }; |
| 125 | |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 126 | struct mem_cgroup_tree { |
| 127 | struct mem_cgroup_tree_per_node *rb_tree_per_node[MAX_NUMNODES]; |
| 128 | }; |
| 129 | |
| 130 | static struct mem_cgroup_tree soft_limit_tree __read_mostly; |
| 131 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 132 | /* for OOM */ |
| 133 | struct mem_cgroup_eventfd_list { |
| 134 | struct list_head list; |
| 135 | struct eventfd_ctx *eventfd; |
| 136 | }; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 137 | |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 138 | /* |
| 139 | * cgroup_event represents events which userspace want to receive. |
| 140 | */ |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 141 | struct mem_cgroup_event { |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 142 | /* |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 143 | * memcg which the event belongs to. |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 144 | */ |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 145 | struct mem_cgroup *memcg; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 146 | /* |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 147 | * eventfd to signal userspace about the event. |
| 148 | */ |
| 149 | struct eventfd_ctx *eventfd; |
| 150 | /* |
| 151 | * Each of these stored in a list by the cgroup. |
| 152 | */ |
| 153 | struct list_head list; |
| 154 | /* |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 155 | * register_event() callback will be used to add new userspace |
| 156 | * waiter for changes related to this event. Use eventfd_signal() |
| 157 | * on eventfd to send notification to userspace. |
| 158 | */ |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 159 | int (*register_event)(struct mem_cgroup *memcg, |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 160 | struct eventfd_ctx *eventfd, const char *args); |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 161 | /* |
| 162 | * unregister_event() callback will be called when userspace closes |
| 163 | * the eventfd or on cgroup removing. This callback must be set, |
| 164 | * if you want provide notification functionality. |
| 165 | */ |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 166 | void (*unregister_event)(struct mem_cgroup *memcg, |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 167 | struct eventfd_ctx *eventfd); |
| 168 | /* |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 169 | * All fields below needed to unregister event when |
| 170 | * userspace closes eventfd. |
| 171 | */ |
| 172 | poll_table pt; |
| 173 | wait_queue_head_t *wqh; |
Ingo Molnar | ac6424b | 2017-06-20 12:06:13 +0200 | [diff] [blame] | 174 | wait_queue_entry_t wait; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 175 | struct work_struct remove; |
| 176 | }; |
| 177 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 178 | static void mem_cgroup_threshold(struct mem_cgroup *memcg); |
| 179 | static void mem_cgroup_oom_notify(struct mem_cgroup *memcg); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 180 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 181 | /* Stuffs for move charges at task migration. */ |
| 182 | /* |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 183 | * Types of charges to be moved. |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 184 | */ |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 185 | #define MOVE_ANON 0x1U |
| 186 | #define MOVE_FILE 0x2U |
| 187 | #define MOVE_MASK (MOVE_ANON | MOVE_FILE) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 188 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 189 | /* "mc" and its members are protected by cgroup_mutex */ |
| 190 | static struct move_charge_struct { |
Daisuke Nishimura | b1dd693 | 2010-11-24 12:57:06 -0800 | [diff] [blame] | 191 | spinlock_t lock; /* for from, to */ |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 192 | struct mm_struct *mm; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 193 | struct mem_cgroup *from; |
| 194 | struct mem_cgroup *to; |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 195 | unsigned long flags; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 196 | unsigned long precharge; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 197 | unsigned long moved_charge; |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 198 | unsigned long moved_swap; |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 199 | struct task_struct *moving_task; /* a task moving charges */ |
| 200 | wait_queue_head_t waitq; /* a waitq for other context */ |
| 201 | } mc = { |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 202 | .lock = __SPIN_LOCK_UNLOCKED(mc.lock), |
Daisuke Nishimura | 8033b97 | 2010-03-10 15:22:16 -0800 | [diff] [blame] | 203 | .waitq = __WAIT_QUEUE_HEAD_INITIALIZER(mc.waitq), |
| 204 | }; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 205 | |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 206 | /* |
| 207 | * Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft |
| 208 | * limit reclaim to prevent infinite loops, if they ever occur. |
| 209 | */ |
Kirill A. Shutemov | a0db00f | 2012-05-29 15:06:56 -0700 | [diff] [blame] | 210 | #define MEM_CGROUP_MAX_RECLAIM_LOOPS 100 |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 211 | #define MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS 2 |
Balbir Singh | 4e41695 | 2009-09-23 15:56:39 -0700 | [diff] [blame] | 212 | |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 213 | enum charge_type { |
| 214 | MEM_CGROUP_CHARGE_TYPE_CACHE = 0, |
Kamezawa Hiroyuki | 41326c1 | 2012-07-31 16:41:40 -0700 | [diff] [blame] | 215 | MEM_CGROUP_CHARGE_TYPE_ANON, |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 216 | MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */ |
KAMEZAWA Hiroyuki | 8a9478c | 2009-06-17 16:27:17 -0700 | [diff] [blame] | 217 | MEM_CGROUP_CHARGE_TYPE_DROP, /* a page was unused swap cache */ |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 218 | NR_CHARGE_TYPE, |
| 219 | }; |
| 220 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 221 | /* for encoding cft->private value on file */ |
Glauber Costa | 86ae53e | 2012-12-18 14:21:45 -0800 | [diff] [blame] | 222 | enum res_type { |
| 223 | _MEM, |
| 224 | _MEMSWAP, |
| 225 | _OOM_TYPE, |
Glauber Costa | 510fc4e | 2012-12-18 14:21:47 -0800 | [diff] [blame] | 226 | _KMEM, |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 227 | _TCP, |
Glauber Costa | 86ae53e | 2012-12-18 14:21:45 -0800 | [diff] [blame] | 228 | }; |
| 229 | |
Kirill A. Shutemov | a0db00f | 2012-05-29 15:06:56 -0700 | [diff] [blame] | 230 | #define MEMFILE_PRIVATE(x, val) ((x) << 16 | (val)) |
| 231 | #define MEMFILE_TYPE(val) ((val) >> 16 & 0xffff) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 232 | #define MEMFILE_ATTR(val) ((val) & 0xffff) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 233 | /* Used for OOM nofiier */ |
| 234 | #define OOM_CONTROL (0) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 235 | |
Anton Vorontsov | 70ddf63 | 2013-04-29 15:08:31 -0700 | [diff] [blame] | 236 | /* Some nice accessors for the vmpressure. */ |
| 237 | struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg) |
| 238 | { |
| 239 | if (!memcg) |
| 240 | memcg = root_mem_cgroup; |
| 241 | return &memcg->vmpressure; |
| 242 | } |
| 243 | |
| 244 | struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr) |
| 245 | { |
| 246 | return &container_of(vmpr, struct mem_cgroup, vmpressure)->css; |
| 247 | } |
| 248 | |
Michal Hocko | 7ffc0ed | 2012-10-08 16:33:13 -0700 | [diff] [blame] | 249 | static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) |
| 250 | { |
| 251 | return (memcg == root_mem_cgroup); |
| 252 | } |
| 253 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 254 | #ifndef CONFIG_SLOB |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 255 | /* |
Vladimir Davydov | f7ce319 | 2015-02-12 14:59:20 -0800 | [diff] [blame] | 256 | * This will be the memcg's index in each cache's ->memcg_params.memcg_caches. |
Li Zefan | b862783 | 2013-09-23 16:56:47 +0800 | [diff] [blame] | 257 | * The main reason for not using cgroup id for this: |
| 258 | * this works better in sparse environments, where we have a lot of memcgs, |
| 259 | * but only a few kmem-limited. Or also, if we have, for instance, 200 |
| 260 | * memcgs, and none but the 200th is kmem-limited, we'd have to have a |
| 261 | * 200 entry array for that. |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 262 | * |
Vladimir Davydov | dbcf73e | 2015-02-12 14:58:57 -0800 | [diff] [blame] | 263 | * The current size of the caches array is stored in memcg_nr_cache_ids. It |
| 264 | * will double each time we have to increase it. |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 265 | */ |
Vladimir Davydov | dbcf73e | 2015-02-12 14:58:57 -0800 | [diff] [blame] | 266 | static DEFINE_IDA(memcg_cache_ida); |
| 267 | int memcg_nr_cache_ids; |
Glauber Costa | 749c541 | 2012-12-18 14:23:01 -0800 | [diff] [blame] | 268 | |
Vladimir Davydov | 05257a1 | 2015-02-12 14:59:01 -0800 | [diff] [blame] | 269 | /* Protects memcg_nr_cache_ids */ |
| 270 | static DECLARE_RWSEM(memcg_cache_ids_sem); |
| 271 | |
| 272 | void memcg_get_cache_ids(void) |
| 273 | { |
| 274 | down_read(&memcg_cache_ids_sem); |
| 275 | } |
| 276 | |
| 277 | void memcg_put_cache_ids(void) |
| 278 | { |
| 279 | up_read(&memcg_cache_ids_sem); |
| 280 | } |
| 281 | |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 282 | /* |
| 283 | * MIN_SIZE is different than 1, because we would like to avoid going through |
| 284 | * the alloc/free process all the time. In a small machine, 4 kmem-limited |
| 285 | * cgroups is a reasonable guess. In the future, it could be a parameter or |
| 286 | * tunable, but that is strictly not necessary. |
| 287 | * |
Li Zefan | b862783 | 2013-09-23 16:56:47 +0800 | [diff] [blame] | 288 | * MAX_SIZE should be as large as the number of cgrp_ids. Ideally, we could get |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 289 | * this constant directly from cgroup, but it is understandable that this is |
| 290 | * better kept as an internal representation in cgroup.c. In any case, the |
Li Zefan | b862783 | 2013-09-23 16:56:47 +0800 | [diff] [blame] | 291 | * cgrp_id space is not getting any smaller, and we don't have to necessarily |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 292 | * increase ours as well if it increases. |
| 293 | */ |
| 294 | #define MEMCG_CACHES_MIN_SIZE 4 |
Li Zefan | b862783 | 2013-09-23 16:56:47 +0800 | [diff] [blame] | 295 | #define MEMCG_CACHES_MAX_SIZE MEM_CGROUP_ID_MAX |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 296 | |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 297 | /* |
| 298 | * A lot of the calls to the cache allocation functions are expected to be |
| 299 | * inlined by the compiler. Since the calls to memcg_kmem_get_cache are |
| 300 | * conditional to this static branch, we'll have to allow modules that does |
| 301 | * kmem_cache_alloc and the such to see this symbol as well |
| 302 | */ |
Johannes Weiner | ef12947 | 2016-01-14 15:21:34 -0800 | [diff] [blame] | 303 | DEFINE_STATIC_KEY_FALSE(memcg_kmem_enabled_key); |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 304 | EXPORT_SYMBOL(memcg_kmem_enabled_key); |
Glauber Costa | a8964b9 | 2012-12-18 14:22:09 -0800 | [diff] [blame] | 305 | |
Tejun Heo | 17cc4df | 2017-02-22 15:41:36 -0800 | [diff] [blame] | 306 | struct workqueue_struct *memcg_kmem_cache_wq; |
| 307 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 308 | #endif /* !CONFIG_SLOB */ |
Glauber Costa | a8964b9 | 2012-12-18 14:22:09 -0800 | [diff] [blame] | 309 | |
Tejun Heo | ad7fa85 | 2015-05-27 20:00:02 -0400 | [diff] [blame] | 310 | /** |
| 311 | * mem_cgroup_css_from_page - css of the memcg associated with a page |
| 312 | * @page: page of interest |
| 313 | * |
| 314 | * If memcg is bound to the default hierarchy, css of the memcg associated |
| 315 | * with @page is returned. The returned css remains associated with @page |
| 316 | * until it is released. |
| 317 | * |
| 318 | * If memcg is bound to a traditional hierarchy, the css of root_mem_cgroup |
| 319 | * is returned. |
Tejun Heo | ad7fa85 | 2015-05-27 20:00:02 -0400 | [diff] [blame] | 320 | */ |
| 321 | struct cgroup_subsys_state *mem_cgroup_css_from_page(struct page *page) |
| 322 | { |
| 323 | struct mem_cgroup *memcg; |
| 324 | |
Tejun Heo | ad7fa85 | 2015-05-27 20:00:02 -0400 | [diff] [blame] | 325 | memcg = page->mem_cgroup; |
| 326 | |
Tejun Heo | 9e10a13 | 2015-09-18 11:56:28 -0400 | [diff] [blame] | 327 | if (!memcg || !cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
Tejun Heo | ad7fa85 | 2015-05-27 20:00:02 -0400 | [diff] [blame] | 328 | memcg = root_mem_cgroup; |
| 329 | |
Tejun Heo | ad7fa85 | 2015-05-27 20:00:02 -0400 | [diff] [blame] | 330 | return &memcg->css; |
| 331 | } |
| 332 | |
Vladimir Davydov | 2fc0452 | 2015-09-09 15:35:28 -0700 | [diff] [blame] | 333 | /** |
| 334 | * page_cgroup_ino - return inode number of the memcg a page is charged to |
| 335 | * @page: the page |
| 336 | * |
| 337 | * Look up the closest online ancestor of the memory cgroup @page is charged to |
| 338 | * and return its inode number or 0 if @page is not charged to any cgroup. It |
| 339 | * is safe to call this function without holding a reference to @page. |
| 340 | * |
| 341 | * Note, this function is inherently racy, because there is nothing to prevent |
| 342 | * the cgroup inode from getting torn down and potentially reallocated a moment |
| 343 | * after page_cgroup_ino() returns, so it only should be used by callers that |
| 344 | * do not care (such as procfs interfaces). |
| 345 | */ |
| 346 | ino_t page_cgroup_ino(struct page *page) |
| 347 | { |
| 348 | struct mem_cgroup *memcg; |
| 349 | unsigned long ino = 0; |
| 350 | |
| 351 | rcu_read_lock(); |
| 352 | memcg = READ_ONCE(page->mem_cgroup); |
| 353 | while (memcg && !(memcg->css.flags & CSS_ONLINE)) |
| 354 | memcg = parent_mem_cgroup(memcg); |
| 355 | if (memcg) |
| 356 | ino = cgroup_ino(memcg->css.cgroup); |
| 357 | rcu_read_unlock(); |
| 358 | return ino; |
| 359 | } |
| 360 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 361 | static struct mem_cgroup_per_node * |
| 362 | mem_cgroup_page_nodeinfo(struct mem_cgroup *memcg, struct page *page) |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 363 | { |
Johannes Weiner | 97a6c37 | 2011-03-23 16:42:27 -0700 | [diff] [blame] | 364 | int nid = page_to_nid(page); |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 365 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 366 | return memcg->nodeinfo[nid]; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 367 | } |
| 368 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 369 | static struct mem_cgroup_tree_per_node * |
| 370 | soft_limit_tree_node(int nid) |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 371 | { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 372 | return soft_limit_tree.rb_tree_per_node[nid]; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 373 | } |
| 374 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 375 | static struct mem_cgroup_tree_per_node * |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 376 | soft_limit_tree_from_page(struct page *page) |
| 377 | { |
| 378 | int nid = page_to_nid(page); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 379 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 380 | return soft_limit_tree.rb_tree_per_node[nid]; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 381 | } |
| 382 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 383 | static void __mem_cgroup_insert_exceeded(struct mem_cgroup_per_node *mz, |
| 384 | struct mem_cgroup_tree_per_node *mctz, |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 385 | unsigned long new_usage_in_excess) |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 386 | { |
| 387 | struct rb_node **p = &mctz->rb_root.rb_node; |
| 388 | struct rb_node *parent = NULL; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 389 | struct mem_cgroup_per_node *mz_node; |
Davidlohr Bueso | fa90b2f | 2017-09-08 16:15:21 -0700 | [diff] [blame] | 390 | bool rightmost = true; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 391 | |
| 392 | if (mz->on_tree) |
| 393 | return; |
| 394 | |
| 395 | mz->usage_in_excess = new_usage_in_excess; |
| 396 | if (!mz->usage_in_excess) |
| 397 | return; |
| 398 | while (*p) { |
| 399 | parent = *p; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 400 | mz_node = rb_entry(parent, struct mem_cgroup_per_node, |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 401 | tree_node); |
Davidlohr Bueso | fa90b2f | 2017-09-08 16:15:21 -0700 | [diff] [blame] | 402 | if (mz->usage_in_excess < mz_node->usage_in_excess) { |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 403 | p = &(*p)->rb_left; |
Davidlohr Bueso | fa90b2f | 2017-09-08 16:15:21 -0700 | [diff] [blame] | 404 | rightmost = false; |
| 405 | } |
| 406 | |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 407 | /* |
| 408 | * We can't avoid mem cgroups that are over their soft |
| 409 | * limit by the same amount |
| 410 | */ |
| 411 | else if (mz->usage_in_excess >= mz_node->usage_in_excess) |
| 412 | p = &(*p)->rb_right; |
| 413 | } |
Davidlohr Bueso | fa90b2f | 2017-09-08 16:15:21 -0700 | [diff] [blame] | 414 | |
| 415 | if (rightmost) |
| 416 | mctz->rb_rightmost = &mz->tree_node; |
| 417 | |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 418 | rb_link_node(&mz->tree_node, parent, p); |
| 419 | rb_insert_color(&mz->tree_node, &mctz->rb_root); |
| 420 | mz->on_tree = true; |
| 421 | } |
| 422 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 423 | static void __mem_cgroup_remove_exceeded(struct mem_cgroup_per_node *mz, |
| 424 | struct mem_cgroup_tree_per_node *mctz) |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 425 | { |
| 426 | if (!mz->on_tree) |
| 427 | return; |
Davidlohr Bueso | fa90b2f | 2017-09-08 16:15:21 -0700 | [diff] [blame] | 428 | |
| 429 | if (&mz->tree_node == mctz->rb_rightmost) |
| 430 | mctz->rb_rightmost = rb_prev(&mz->tree_node); |
| 431 | |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 432 | rb_erase(&mz->tree_node, &mctz->rb_root); |
| 433 | mz->on_tree = false; |
| 434 | } |
| 435 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 436 | static void mem_cgroup_remove_exceeded(struct mem_cgroup_per_node *mz, |
| 437 | struct mem_cgroup_tree_per_node *mctz) |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 438 | { |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 439 | unsigned long flags; |
| 440 | |
| 441 | spin_lock_irqsave(&mctz->lock, flags); |
Johannes Weiner | cf2c812 | 2014-06-06 14:38:21 -0700 | [diff] [blame] | 442 | __mem_cgroup_remove_exceeded(mz, mctz); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 443 | spin_unlock_irqrestore(&mctz->lock, flags); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 444 | } |
| 445 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 446 | static unsigned long soft_limit_excess(struct mem_cgroup *memcg) |
| 447 | { |
| 448 | unsigned long nr_pages = page_counter_read(&memcg->memory); |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 449 | unsigned long soft_limit = READ_ONCE(memcg->soft_limit); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 450 | unsigned long excess = 0; |
| 451 | |
| 452 | if (nr_pages > soft_limit) |
| 453 | excess = nr_pages - soft_limit; |
| 454 | |
| 455 | return excess; |
| 456 | } |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 457 | |
| 458 | static void mem_cgroup_update_tree(struct mem_cgroup *memcg, struct page *page) |
| 459 | { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 460 | unsigned long excess; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 461 | struct mem_cgroup_per_node *mz; |
| 462 | struct mem_cgroup_tree_per_node *mctz; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 463 | |
Jianyu Zhan | e231875 | 2014-06-06 14:38:20 -0700 | [diff] [blame] | 464 | mctz = soft_limit_tree_from_page(page); |
Laurent Dufour | bfc7228 | 2017-03-09 16:17:06 -0800 | [diff] [blame] | 465 | if (!mctz) |
| 466 | return; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 467 | /* |
| 468 | * Necessary to update all ancestors when hierarchy is used. |
| 469 | * because their event counter is not touched. |
| 470 | */ |
| 471 | for (; memcg; memcg = parent_mem_cgroup(memcg)) { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 472 | mz = mem_cgroup_page_nodeinfo(memcg, page); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 473 | excess = soft_limit_excess(memcg); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 474 | /* |
| 475 | * We have to update the tree if mz is on RB-tree or |
| 476 | * mem is over its softlimit. |
| 477 | */ |
| 478 | if (excess || mz->on_tree) { |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 479 | unsigned long flags; |
| 480 | |
| 481 | spin_lock_irqsave(&mctz->lock, flags); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 482 | /* if on-tree, remove it */ |
| 483 | if (mz->on_tree) |
Johannes Weiner | cf2c812 | 2014-06-06 14:38:21 -0700 | [diff] [blame] | 484 | __mem_cgroup_remove_exceeded(mz, mctz); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 485 | /* |
| 486 | * Insert again. mz->usage_in_excess will be updated. |
| 487 | * If excess is 0, no tree ops. |
| 488 | */ |
Johannes Weiner | cf2c812 | 2014-06-06 14:38:21 -0700 | [diff] [blame] | 489 | __mem_cgroup_insert_exceeded(mz, mctz, excess); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 490 | spin_unlock_irqrestore(&mctz->lock, flags); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 491 | } |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | static void mem_cgroup_remove_from_trees(struct mem_cgroup *memcg) |
| 496 | { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 497 | struct mem_cgroup_tree_per_node *mctz; |
| 498 | struct mem_cgroup_per_node *mz; |
| 499 | int nid; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 500 | |
Jianyu Zhan | e231875 | 2014-06-06 14:38:20 -0700 | [diff] [blame] | 501 | for_each_node(nid) { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 502 | mz = mem_cgroup_nodeinfo(memcg, nid); |
| 503 | mctz = soft_limit_tree_node(nid); |
Laurent Dufour | bfc7228 | 2017-03-09 16:17:06 -0800 | [diff] [blame] | 504 | if (mctz) |
| 505 | mem_cgroup_remove_exceeded(mz, mctz); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 506 | } |
| 507 | } |
| 508 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 509 | static struct mem_cgroup_per_node * |
| 510 | __mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz) |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 511 | { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 512 | struct mem_cgroup_per_node *mz; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 513 | |
| 514 | retry: |
| 515 | mz = NULL; |
Davidlohr Bueso | fa90b2f | 2017-09-08 16:15:21 -0700 | [diff] [blame] | 516 | if (!mctz->rb_rightmost) |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 517 | goto done; /* Nothing to reclaim from */ |
| 518 | |
Davidlohr Bueso | fa90b2f | 2017-09-08 16:15:21 -0700 | [diff] [blame] | 519 | mz = rb_entry(mctz->rb_rightmost, |
| 520 | struct mem_cgroup_per_node, tree_node); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 521 | /* |
| 522 | * Remove the node now but someone else can add it back, |
| 523 | * we will to add it back at the end of reclaim to its correct |
| 524 | * position in the tree. |
| 525 | */ |
Johannes Weiner | cf2c812 | 2014-06-06 14:38:21 -0700 | [diff] [blame] | 526 | __mem_cgroup_remove_exceeded(mz, mctz); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 527 | if (!soft_limit_excess(mz->memcg) || |
Tejun Heo | ec903c0 | 2014-05-13 12:11:01 -0400 | [diff] [blame] | 528 | !css_tryget_online(&mz->memcg->css)) |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 529 | goto retry; |
| 530 | done: |
| 531 | return mz; |
| 532 | } |
| 533 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 534 | static struct mem_cgroup_per_node * |
| 535 | mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz) |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 536 | { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 537 | struct mem_cgroup_per_node *mz; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 538 | |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 539 | spin_lock_irq(&mctz->lock); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 540 | mz = __mem_cgroup_largest_soft_limit_node(mctz); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 541 | spin_unlock_irq(&mctz->lock); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 542 | return mz; |
| 543 | } |
| 544 | |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 545 | /* |
Greg Thelen | 484ebb3 | 2015-10-01 15:37:05 -0700 | [diff] [blame] | 546 | * Return page count for single (non recursive) @memcg. |
| 547 | * |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 548 | * Implementation Note: reading percpu statistics for memcg. |
| 549 | * |
| 550 | * Both of vmstat[] and percpu_counter has threshold and do periodic |
| 551 | * synchronization to implement "quick" read. There are trade-off between |
| 552 | * reading cost and precision of value. Then, we may have a chance to implement |
Greg Thelen | 484ebb3 | 2015-10-01 15:37:05 -0700 | [diff] [blame] | 553 | * a periodic synchronization of counter in memcg's counter. |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 554 | * |
| 555 | * But this _read() function is used for user interface now. The user accounts |
| 556 | * memory usage by memory cgroup and he _always_ requires exact value because |
| 557 | * he accounts memory. Even if we provide quick-and-fuzzy read, we always |
| 558 | * have to visit all online cpus and make sum. So, for now, unnecessary |
| 559 | * synchronization is not implemented. (just implemented for cpu hotplug) |
| 560 | * |
| 561 | * If there are kernel internal actions which can make use of some not-exact |
| 562 | * value, and reading all cpu value can be performance bottleneck in some |
Greg Thelen | 484ebb3 | 2015-10-01 15:37:05 -0700 | [diff] [blame] | 563 | * common workload, threshold and synchronization as vmstat[] should be |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 564 | * implemented. |
Matthias Kaehlcke | 04fecbf | 2017-09-06 16:22:09 -0700 | [diff] [blame] | 565 | * |
| 566 | * The parameter idx can be of type enum memcg_event_item or vm_event_item. |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 567 | */ |
KAMEZAWA Hiroyuki | c62b1a3 | 2010-03-10 15:22:29 -0800 | [diff] [blame] | 568 | |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 569 | static unsigned long memcg_sum_events(struct mem_cgroup *memcg, |
Matthias Kaehlcke | 04fecbf | 2017-09-06 16:22:09 -0700 | [diff] [blame] | 570 | int event) |
Johannes Weiner | e9f8974 | 2011-03-23 16:42:37 -0700 | [diff] [blame] | 571 | { |
| 572 | unsigned long val = 0; |
| 573 | int cpu; |
| 574 | |
Tejun Heo | 733a572 | 2015-05-22 18:23:18 -0400 | [diff] [blame] | 575 | for_each_possible_cpu(cpu) |
Johannes Weiner | df0e53d | 2017-05-03 14:55:10 -0700 | [diff] [blame] | 576 | val += per_cpu(memcg->stat->events[event], cpu); |
Johannes Weiner | e9f8974 | 2011-03-23 16:42:37 -0700 | [diff] [blame] | 577 | return val; |
| 578 | } |
| 579 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 580 | static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg, |
David Rientjes | b070e65 | 2013-05-07 16:18:09 -0700 | [diff] [blame] | 581 | struct page *page, |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 582 | bool compound, int nr_pages) |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 583 | { |
KAMEZAWA Hiroyuki | b2402857 | 2012-03-21 16:34:22 -0700 | [diff] [blame] | 584 | /* |
| 585 | * Here, RSS means 'mapped anon' and anon's SwapCache. Shmem/tmpfs is |
| 586 | * counted as CACHE even if it's on ANON LRU. |
| 587 | */ |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 588 | if (PageAnon(page)) |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 589 | __this_cpu_add(memcg->stat->count[MEMCG_RSS], nr_pages); |
Johannes Weiner | 9a4caf1 | 2017-05-03 14:52:45 -0700 | [diff] [blame] | 590 | else { |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 591 | __this_cpu_add(memcg->stat->count[MEMCG_CACHE], nr_pages); |
Johannes Weiner | 9a4caf1 | 2017-05-03 14:52:45 -0700 | [diff] [blame] | 592 | if (PageSwapBacked(page)) |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 593 | __this_cpu_add(memcg->stat->count[NR_SHMEM], nr_pages); |
Johannes Weiner | 9a4caf1 | 2017-05-03 14:52:45 -0700 | [diff] [blame] | 594 | } |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 595 | |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 596 | if (compound) { |
| 597 | VM_BUG_ON_PAGE(!PageTransHuge(page), page); |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 598 | __this_cpu_add(memcg->stat->count[MEMCG_RSS_HUGE], nr_pages); |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 599 | } |
David Rientjes | b070e65 | 2013-05-07 16:18:09 -0700 | [diff] [blame] | 600 | |
KAMEZAWA Hiroyuki | e401f176 | 2011-01-20 14:44:23 -0800 | [diff] [blame] | 601 | /* pagein of a big page is an event. So, ignore page size */ |
| 602 | if (nr_pages > 0) |
Johannes Weiner | df0e53d | 2017-05-03 14:55:10 -0700 | [diff] [blame] | 603 | __this_cpu_inc(memcg->stat->events[PGPGIN]); |
KAMEZAWA Hiroyuki | 3751d60 | 2011-02-01 15:52:45 -0800 | [diff] [blame] | 604 | else { |
Johannes Weiner | df0e53d | 2017-05-03 14:55:10 -0700 | [diff] [blame] | 605 | __this_cpu_inc(memcg->stat->events[PGPGOUT]); |
KAMEZAWA Hiroyuki | 3751d60 | 2011-02-01 15:52:45 -0800 | [diff] [blame] | 606 | nr_pages = -nr_pages; /* for event */ |
| 607 | } |
KAMEZAWA Hiroyuki | e401f176 | 2011-01-20 14:44:23 -0800 | [diff] [blame] | 608 | |
Johannes Weiner | 1311471 | 2012-05-29 15:07:07 -0700 | [diff] [blame] | 609 | __this_cpu_add(memcg->stat->nr_page_events, nr_pages); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 610 | } |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 611 | |
Vladimir Davydov | 0a6b76d | 2016-03-17 14:18:42 -0700 | [diff] [blame] | 612 | unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg, |
| 613 | int nid, unsigned int lru_mask) |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 614 | { |
Michal Hocko | b4536f0c8 | 2017-01-10 16:58:04 -0800 | [diff] [blame] | 615 | struct lruvec *lruvec = mem_cgroup_lruvec(NODE_DATA(nid), memcg); |
Jianyu Zhan | e231875 | 2014-06-06 14:38:20 -0700 | [diff] [blame] | 616 | unsigned long nr = 0; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 617 | enum lru_list lru; |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 618 | |
Jianyu Zhan | e231875 | 2014-06-06 14:38:20 -0700 | [diff] [blame] | 619 | VM_BUG_ON((unsigned)nid >= nr_node_ids); |
KAMEZAWA Hiroyuki | bb2a0de | 2011-07-26 16:08:22 -0700 | [diff] [blame] | 620 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 621 | for_each_lru(lru) { |
| 622 | if (!(BIT(lru) & lru_mask)) |
| 623 | continue; |
Michal Hocko | b4536f0c8 | 2017-01-10 16:58:04 -0800 | [diff] [blame] | 624 | nr += mem_cgroup_get_lru_size(lruvec, lru); |
Jianyu Zhan | e231875 | 2014-06-06 14:38:20 -0700 | [diff] [blame] | 625 | } |
| 626 | return nr; |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 627 | } |
KAMEZAWA Hiroyuki | bb2a0de | 2011-07-26 16:08:22 -0700 | [diff] [blame] | 628 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 629 | static unsigned long mem_cgroup_nr_lru_pages(struct mem_cgroup *memcg, |
KAMEZAWA Hiroyuki | bb2a0de | 2011-07-26 16:08:22 -0700 | [diff] [blame] | 630 | unsigned int lru_mask) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 631 | { |
Jianyu Zhan | e231875 | 2014-06-06 14:38:20 -0700 | [diff] [blame] | 632 | unsigned long nr = 0; |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 633 | int nid; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 634 | |
Lai Jiangshan | 31aaea4 | 2012-12-12 13:51:27 -0800 | [diff] [blame] | 635 | for_each_node_state(nid, N_MEMORY) |
Jianyu Zhan | e231875 | 2014-06-06 14:38:20 -0700 | [diff] [blame] | 636 | nr += mem_cgroup_node_nr_lru_pages(memcg, nid, lru_mask); |
| 637 | return nr; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 638 | } |
| 639 | |
Johannes Weiner | f53d7ce | 2012-01-12 17:18:23 -0800 | [diff] [blame] | 640 | static bool mem_cgroup_event_ratelimit(struct mem_cgroup *memcg, |
| 641 | enum mem_cgroup_events_target target) |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 642 | { |
Johannes Weiner | 7a159cc | 2011-03-23 16:42:38 -0700 | [diff] [blame] | 643 | unsigned long val, next; |
| 644 | |
Johannes Weiner | 1311471 | 2012-05-29 15:07:07 -0700 | [diff] [blame] | 645 | val = __this_cpu_read(memcg->stat->nr_page_events); |
Steven Rostedt | 4799401 | 2011-11-02 13:38:33 -0700 | [diff] [blame] | 646 | next = __this_cpu_read(memcg->stat->targets[target]); |
Johannes Weiner | 7a159cc | 2011-03-23 16:42:38 -0700 | [diff] [blame] | 647 | /* from time_after() in jiffies.h */ |
Michal Hocko | 6a1a8b8 | 2017-07-10 15:48:53 -0700 | [diff] [blame] | 648 | if ((long)(next - val) < 0) { |
Johannes Weiner | f53d7ce | 2012-01-12 17:18:23 -0800 | [diff] [blame] | 649 | switch (target) { |
| 650 | case MEM_CGROUP_TARGET_THRESH: |
| 651 | next = val + THRESHOLDS_EVENTS_TARGET; |
| 652 | break; |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 653 | case MEM_CGROUP_TARGET_SOFTLIMIT: |
| 654 | next = val + SOFTLIMIT_EVENTS_TARGET; |
| 655 | break; |
Johannes Weiner | f53d7ce | 2012-01-12 17:18:23 -0800 | [diff] [blame] | 656 | case MEM_CGROUP_TARGET_NUMAINFO: |
| 657 | next = val + NUMAINFO_EVENTS_TARGET; |
| 658 | break; |
| 659 | default: |
| 660 | break; |
| 661 | } |
| 662 | __this_cpu_write(memcg->stat->targets[target], next); |
| 663 | return true; |
Johannes Weiner | 7a159cc | 2011-03-23 16:42:38 -0700 | [diff] [blame] | 664 | } |
Johannes Weiner | f53d7ce | 2012-01-12 17:18:23 -0800 | [diff] [blame] | 665 | return false; |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 666 | } |
| 667 | |
| 668 | /* |
| 669 | * Check events in order. |
| 670 | * |
| 671 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 672 | static void memcg_check_events(struct mem_cgroup *memcg, struct page *page) |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 673 | { |
| 674 | /* threshold event is triggered in finer grain than soft limit */ |
Johannes Weiner | f53d7ce | 2012-01-12 17:18:23 -0800 | [diff] [blame] | 675 | if (unlikely(mem_cgroup_event_ratelimit(memcg, |
| 676 | MEM_CGROUP_TARGET_THRESH))) { |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 677 | bool do_softlimit; |
Andrew Morton | 82b3f2a | 2012-02-03 15:37:14 -0800 | [diff] [blame] | 678 | bool do_numainfo __maybe_unused; |
Johannes Weiner | f53d7ce | 2012-01-12 17:18:23 -0800 | [diff] [blame] | 679 | |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 680 | do_softlimit = mem_cgroup_event_ratelimit(memcg, |
| 681 | MEM_CGROUP_TARGET_SOFTLIMIT); |
KAMEZAWA Hiroyuki | 453a9bf | 2011-07-08 15:39:43 -0700 | [diff] [blame] | 682 | #if MAX_NUMNODES > 1 |
Johannes Weiner | f53d7ce | 2012-01-12 17:18:23 -0800 | [diff] [blame] | 683 | do_numainfo = mem_cgroup_event_ratelimit(memcg, |
| 684 | MEM_CGROUP_TARGET_NUMAINFO); |
KAMEZAWA Hiroyuki | 453a9bf | 2011-07-08 15:39:43 -0700 | [diff] [blame] | 685 | #endif |
Johannes Weiner | f53d7ce | 2012-01-12 17:18:23 -0800 | [diff] [blame] | 686 | mem_cgroup_threshold(memcg); |
Andrew Morton | bb4cc1a | 2013-09-24 15:27:40 -0700 | [diff] [blame] | 687 | if (unlikely(do_softlimit)) |
| 688 | mem_cgroup_update_tree(memcg, page); |
Johannes Weiner | f53d7ce | 2012-01-12 17:18:23 -0800 | [diff] [blame] | 689 | #if MAX_NUMNODES > 1 |
| 690 | if (unlikely(do_numainfo)) |
| 691 | atomic_inc(&memcg->numainfo_events); |
| 692 | #endif |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 693 | } |
KAMEZAWA Hiroyuki | d2265e6 | 2010-03-10 15:22:31 -0800 | [diff] [blame] | 694 | } |
| 695 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 696 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 697 | { |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 698 | /* |
| 699 | * mm_update_next_owner() may clear mm->owner to NULL |
| 700 | * if it races with swapoff, page migration, etc. |
| 701 | * So this can be called with p == NULL. |
| 702 | */ |
| 703 | if (unlikely(!p)) |
| 704 | return NULL; |
| 705 | |
Tejun Heo | 073219e | 2014-02-08 10:36:58 -0500 | [diff] [blame] | 706 | return mem_cgroup_from_css(task_css(p, memory_cgrp_id)); |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 707 | } |
Michal Hocko | 33398cf | 2015-09-08 15:01:02 -0700 | [diff] [blame] | 708 | EXPORT_SYMBOL(mem_cgroup_from_task); |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 709 | |
Johannes Weiner | df38197 | 2014-04-07 15:37:43 -0700 | [diff] [blame] | 710 | static struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm) |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 711 | { |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 712 | struct mem_cgroup *memcg = NULL; |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 713 | |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 714 | rcu_read_lock(); |
| 715 | do { |
Michal Hocko | 6f6acb0 | 2014-05-22 11:54:19 -0700 | [diff] [blame] | 716 | /* |
| 717 | * Page cache insertions can happen withou an |
| 718 | * actual mm context, e.g. during disk probing |
| 719 | * on boot, loopback IO, acct() writes etc. |
| 720 | */ |
| 721 | if (unlikely(!mm)) |
Johannes Weiner | df38197 | 2014-04-07 15:37:43 -0700 | [diff] [blame] | 722 | memcg = root_mem_cgroup; |
Michal Hocko | 6f6acb0 | 2014-05-22 11:54:19 -0700 | [diff] [blame] | 723 | else { |
| 724 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
| 725 | if (unlikely(!memcg)) |
| 726 | memcg = root_mem_cgroup; |
| 727 | } |
Tejun Heo | ec903c0 | 2014-05-13 12:11:01 -0400 | [diff] [blame] | 728 | } while (!css_tryget_online(&memcg->css)); |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 729 | rcu_read_unlock(); |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 730 | return memcg; |
KAMEZAWA Hiroyuki | 54595fe | 2009-01-07 18:08:33 -0800 | [diff] [blame] | 731 | } |
| 732 | |
Johannes Weiner | 5660048 | 2012-01-12 17:17:59 -0800 | [diff] [blame] | 733 | /** |
| 734 | * mem_cgroup_iter - iterate over memory cgroup hierarchy |
| 735 | * @root: hierarchy root |
| 736 | * @prev: previously returned memcg, NULL on first invocation |
| 737 | * @reclaim: cookie for shared reclaim walks, NULL for full walks |
| 738 | * |
| 739 | * Returns references to children of the hierarchy below @root, or |
| 740 | * @root itself, or %NULL after a full round-trip. |
| 741 | * |
| 742 | * Caller must pass the return value in @prev on subsequent |
| 743 | * invocations for reference counting, or use mem_cgroup_iter_break() |
| 744 | * to cancel a hierarchy walk before the round-trip is complete. |
| 745 | * |
| 746 | * Reclaimers can specify a zone and a priority level in @reclaim to |
| 747 | * divide up the memcgs in the hierarchy among all concurrent |
| 748 | * reclaimers operating on the same zone and priority. |
| 749 | */ |
Andrew Morton | 694fbc0 | 2013-09-24 15:27:37 -0700 | [diff] [blame] | 750 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root, |
Johannes Weiner | 5660048 | 2012-01-12 17:17:59 -0800 | [diff] [blame] | 751 | struct mem_cgroup *prev, |
Andrew Morton | 694fbc0 | 2013-09-24 15:27:37 -0700 | [diff] [blame] | 752 | struct mem_cgroup_reclaim_cookie *reclaim) |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 753 | { |
Michal Hocko | 33398cf | 2015-09-08 15:01:02 -0700 | [diff] [blame] | 754 | struct mem_cgroup_reclaim_iter *uninitialized_var(iter); |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 755 | struct cgroup_subsys_state *css = NULL; |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 756 | struct mem_cgroup *memcg = NULL; |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 757 | struct mem_cgroup *pos = NULL; |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 758 | |
Andrew Morton | 694fbc0 | 2013-09-24 15:27:37 -0700 | [diff] [blame] | 759 | if (mem_cgroup_disabled()) |
| 760 | return NULL; |
Johannes Weiner | 5660048 | 2012-01-12 17:17:59 -0800 | [diff] [blame] | 761 | |
KAMEZAWA Hiroyuki | 711d3d2 | 2010-10-27 15:33:42 -0700 | [diff] [blame] | 762 | if (!root) |
| 763 | root = root_mem_cgroup; |
| 764 | |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 765 | if (prev && !reclaim) |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 766 | pos = prev; |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 767 | |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 768 | if (!root->use_hierarchy && root != root_mem_cgroup) { |
| 769 | if (prev) |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 770 | goto out; |
Andrew Morton | 694fbc0 | 2013-09-24 15:27:37 -0700 | [diff] [blame] | 771 | return root; |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 772 | } |
| 773 | |
Michal Hocko | 542f85f | 2013-04-29 15:07:15 -0700 | [diff] [blame] | 774 | rcu_read_lock(); |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 775 | |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 776 | if (reclaim) { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 777 | struct mem_cgroup_per_node *mz; |
Johannes Weiner | 527a5ec | 2012-01-12 17:17:55 -0800 | [diff] [blame] | 778 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 779 | mz = mem_cgroup_nodeinfo(root, reclaim->pgdat->node_id); |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 780 | iter = &mz->iter[reclaim->priority]; |
Michal Hocko | 5f57816 | 2013-04-29 15:07:17 -0700 | [diff] [blame] | 781 | |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 782 | if (prev && reclaim->generation != iter->generation) |
Michal Hocko | 542f85f | 2013-04-29 15:07:15 -0700 | [diff] [blame] | 783 | goto out_unlock; |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 784 | |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 785 | while (1) { |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 786 | pos = READ_ONCE(iter->position); |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 787 | if (!pos || css_tryget(&pos->css)) |
| 788 | break; |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 789 | /* |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 790 | * css reference reached zero, so iter->position will |
| 791 | * be cleared by ->css_released. However, we should not |
| 792 | * rely on this happening soon, because ->css_released |
| 793 | * is called from a work queue, and by busy-waiting we |
| 794 | * might block it. So we clear iter->position right |
| 795 | * away. |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 796 | */ |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 797 | (void)cmpxchg(&iter->position, pos, NULL); |
| 798 | } |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 799 | } |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 800 | |
| 801 | if (pos) |
| 802 | css = &pos->css; |
| 803 | |
| 804 | for (;;) { |
| 805 | css = css_next_descendant_pre(css, &root->css); |
| 806 | if (!css) { |
| 807 | /* |
| 808 | * Reclaimers share the hierarchy walk, and a |
| 809 | * new one might jump in right at the end of |
| 810 | * the hierarchy - make sure they see at least |
| 811 | * one group and restart from the beginning. |
| 812 | */ |
| 813 | if (!prev) |
| 814 | continue; |
| 815 | break; |
| 816 | } |
| 817 | |
| 818 | /* |
| 819 | * Verify the css and acquire a reference. The root |
| 820 | * is provided by the caller, so we know it's alive |
| 821 | * and kicking, and don't take an extra reference. |
| 822 | */ |
| 823 | memcg = mem_cgroup_from_css(css); |
| 824 | |
| 825 | if (css == &root->css) |
| 826 | break; |
| 827 | |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 828 | if (css_tryget(css)) |
| 829 | break; |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 830 | |
| 831 | memcg = NULL; |
| 832 | } |
| 833 | |
| 834 | if (reclaim) { |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 835 | /* |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 836 | * The position could have already been updated by a competing |
| 837 | * thread, so check that the value hasn't changed since we read |
| 838 | * it to avoid reclaiming from the same cgroup twice. |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 839 | */ |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 840 | (void)cmpxchg(&iter->position, pos, memcg); |
| 841 | |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 842 | if (pos) |
| 843 | css_put(&pos->css); |
| 844 | |
| 845 | if (!memcg) |
| 846 | iter->generation++; |
| 847 | else if (!prev) |
| 848 | reclaim->generation = iter->generation; |
| 849 | } |
| 850 | |
Michal Hocko | 542f85f | 2013-04-29 15:07:15 -0700 | [diff] [blame] | 851 | out_unlock: |
| 852 | rcu_read_unlock(); |
Johannes Weiner | 5ac8fb3 | 2014-12-10 15:42:39 -0800 | [diff] [blame] | 853 | out: |
Michal Hocko | c40046f | 2013-04-29 15:07:14 -0700 | [diff] [blame] | 854 | if (prev && prev != root) |
| 855 | css_put(&prev->css); |
| 856 | |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 857 | return memcg; |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 858 | } |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 859 | |
Johannes Weiner | 5660048 | 2012-01-12 17:17:59 -0800 | [diff] [blame] | 860 | /** |
| 861 | * mem_cgroup_iter_break - abort a hierarchy walk prematurely |
| 862 | * @root: hierarchy root |
| 863 | * @prev: last visited hierarchy member as returned by mem_cgroup_iter() |
| 864 | */ |
| 865 | void mem_cgroup_iter_break(struct mem_cgroup *root, |
| 866 | struct mem_cgroup *prev) |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 867 | { |
| 868 | if (!root) |
| 869 | root = root_mem_cgroup; |
| 870 | if (prev && prev != root) |
| 871 | css_put(&prev->css); |
| 872 | } |
| 873 | |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 874 | static void invalidate_reclaim_iterators(struct mem_cgroup *dead_memcg) |
| 875 | { |
| 876 | struct mem_cgroup *memcg = dead_memcg; |
| 877 | struct mem_cgroup_reclaim_iter *iter; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 878 | struct mem_cgroup_per_node *mz; |
| 879 | int nid; |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 880 | int i; |
| 881 | |
| 882 | while ((memcg = parent_mem_cgroup(memcg))) { |
| 883 | for_each_node(nid) { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 884 | mz = mem_cgroup_nodeinfo(memcg, nid); |
| 885 | for (i = 0; i <= DEF_PRIORITY; i++) { |
| 886 | iter = &mz->iter[i]; |
| 887 | cmpxchg(&iter->position, |
| 888 | dead_memcg, NULL); |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 889 | } |
| 890 | } |
| 891 | } |
| 892 | } |
| 893 | |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 894 | /* |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 895 | * Iteration constructs for visiting all cgroups (under a tree). If |
| 896 | * loops are exited prematurely (break), mem_cgroup_iter_break() must |
| 897 | * be used for reference counting. |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 898 | */ |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 899 | #define for_each_mem_cgroup_tree(iter, root) \ |
Johannes Weiner | 527a5ec | 2012-01-12 17:17:55 -0800 | [diff] [blame] | 900 | for (iter = mem_cgroup_iter(root, NULL, NULL); \ |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 901 | iter != NULL; \ |
Johannes Weiner | 527a5ec | 2012-01-12 17:17:55 -0800 | [diff] [blame] | 902 | iter = mem_cgroup_iter(root, iter, NULL)) |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 903 | |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 904 | #define for_each_mem_cgroup(iter) \ |
Johannes Weiner | 527a5ec | 2012-01-12 17:17:55 -0800 | [diff] [blame] | 905 | for (iter = mem_cgroup_iter(NULL, NULL, NULL); \ |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 906 | iter != NULL; \ |
Johannes Weiner | 527a5ec | 2012-01-12 17:17:55 -0800 | [diff] [blame] | 907 | iter = mem_cgroup_iter(NULL, iter, NULL)) |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 908 | |
Johannes Weiner | 925b767 | 2012-01-12 17:18:15 -0800 | [diff] [blame] | 909 | /** |
Vladimir Davydov | 7c5f64f | 2016-10-07 16:57:23 -0700 | [diff] [blame] | 910 | * mem_cgroup_scan_tasks - iterate over tasks of a memory cgroup hierarchy |
| 911 | * @memcg: hierarchy root |
| 912 | * @fn: function to call for each task |
| 913 | * @arg: argument passed to @fn |
| 914 | * |
| 915 | * This function iterates over tasks attached to @memcg or to any of its |
| 916 | * descendants and calls @fn for each task. If @fn returns a non-zero |
| 917 | * value, the function breaks the iteration loop and returns the value. |
| 918 | * Otherwise, it will iterate over all tasks and return 0. |
| 919 | * |
| 920 | * This function must not be called for the root memory cgroup. |
| 921 | */ |
| 922 | int mem_cgroup_scan_tasks(struct mem_cgroup *memcg, |
| 923 | int (*fn)(struct task_struct *, void *), void *arg) |
| 924 | { |
| 925 | struct mem_cgroup *iter; |
| 926 | int ret = 0; |
| 927 | |
| 928 | BUG_ON(memcg == root_mem_cgroup); |
| 929 | |
| 930 | for_each_mem_cgroup_tree(iter, memcg) { |
| 931 | struct css_task_iter it; |
| 932 | struct task_struct *task; |
| 933 | |
Tejun Heo | bc2fb7e | 2017-05-15 09:34:01 -0400 | [diff] [blame] | 934 | css_task_iter_start(&iter->css, 0, &it); |
Vladimir Davydov | 7c5f64f | 2016-10-07 16:57:23 -0700 | [diff] [blame] | 935 | while (!ret && (task = css_task_iter_next(&it))) |
| 936 | ret = fn(task, arg); |
| 937 | css_task_iter_end(&it); |
| 938 | if (ret) { |
| 939 | mem_cgroup_iter_break(memcg, iter); |
| 940 | break; |
| 941 | } |
| 942 | } |
| 943 | return ret; |
| 944 | } |
| 945 | |
| 946 | /** |
Johannes Weiner | dfe0e77 | 2014-12-10 15:43:43 -0800 | [diff] [blame] | 947 | * mem_cgroup_page_lruvec - return lruvec for isolating/putting an LRU page |
Johannes Weiner | 925b767 | 2012-01-12 17:18:15 -0800 | [diff] [blame] | 948 | * @page: the page |
Hugh Dickins | fa9add6 | 2012-05-29 15:07:09 -0700 | [diff] [blame] | 949 | * @zone: zone of the page |
Johannes Weiner | dfe0e77 | 2014-12-10 15:43:43 -0800 | [diff] [blame] | 950 | * |
| 951 | * This function is only safe when following the LRU page isolation |
| 952 | * and putback protocol: the LRU lock must be held, and the page must |
| 953 | * either be PageLRU() or the caller must have isolated/allocated it. |
Minchan Kim | 3f58a82 | 2011-03-22 16:32:53 -0700 | [diff] [blame] | 954 | */ |
Mel Gorman | 599d0c9 | 2016-07-28 15:45:31 -0700 | [diff] [blame] | 955 | struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct pglist_data *pgdat) |
Minchan Kim | 3f58a82 | 2011-03-22 16:32:53 -0700 | [diff] [blame] | 956 | { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 957 | struct mem_cgroup_per_node *mz; |
Johannes Weiner | 925b767 | 2012-01-12 17:18:15 -0800 | [diff] [blame] | 958 | struct mem_cgroup *memcg; |
Hugh Dickins | bea8c15 | 2012-11-16 14:14:54 -0800 | [diff] [blame] | 959 | struct lruvec *lruvec; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 960 | |
Hugh Dickins | bea8c15 | 2012-11-16 14:14:54 -0800 | [diff] [blame] | 961 | if (mem_cgroup_disabled()) { |
Mel Gorman | 599d0c9 | 2016-07-28 15:45:31 -0700 | [diff] [blame] | 962 | lruvec = &pgdat->lruvec; |
Hugh Dickins | bea8c15 | 2012-11-16 14:14:54 -0800 | [diff] [blame] | 963 | goto out; |
| 964 | } |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 965 | |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 966 | memcg = page->mem_cgroup; |
Hugh Dickins | 7512102 | 2012-03-05 14:59:18 -0800 | [diff] [blame] | 967 | /* |
Johannes Weiner | dfe0e77 | 2014-12-10 15:43:43 -0800 | [diff] [blame] | 968 | * Swapcache readahead pages are added to the LRU - and |
Johannes Weiner | 2983331 | 2014-12-10 15:44:02 -0800 | [diff] [blame] | 969 | * possibly migrated - before they are charged. |
Hugh Dickins | 7512102 | 2012-03-05 14:59:18 -0800 | [diff] [blame] | 970 | */ |
Johannes Weiner | 2983331 | 2014-12-10 15:44:02 -0800 | [diff] [blame] | 971 | if (!memcg) |
| 972 | memcg = root_mem_cgroup; |
Hugh Dickins | 7512102 | 2012-03-05 14:59:18 -0800 | [diff] [blame] | 973 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 974 | mz = mem_cgroup_page_nodeinfo(memcg, page); |
Hugh Dickins | bea8c15 | 2012-11-16 14:14:54 -0800 | [diff] [blame] | 975 | lruvec = &mz->lruvec; |
| 976 | out: |
| 977 | /* |
| 978 | * Since a node can be onlined after the mem_cgroup was created, |
| 979 | * we have to be prepared to initialize lruvec->zone here; |
| 980 | * and if offlined then reonlined, we need to reinitialize it. |
| 981 | */ |
Mel Gorman | 599d0c9 | 2016-07-28 15:45:31 -0700 | [diff] [blame] | 982 | if (unlikely(lruvec->pgdat != pgdat)) |
| 983 | lruvec->pgdat = pgdat; |
Hugh Dickins | bea8c15 | 2012-11-16 14:14:54 -0800 | [diff] [blame] | 984 | return lruvec; |
Johannes Weiner | 925b767 | 2012-01-12 17:18:15 -0800 | [diff] [blame] | 985 | } |
| 986 | |
| 987 | /** |
Hugh Dickins | fa9add6 | 2012-05-29 15:07:09 -0700 | [diff] [blame] | 988 | * mem_cgroup_update_lru_size - account for adding or removing an lru page |
| 989 | * @lruvec: mem_cgroup per zone lru vector |
| 990 | * @lru: index of lru list the page is sitting on |
Michal Hocko | b4536f0c8 | 2017-01-10 16:58:04 -0800 | [diff] [blame] | 991 | * @zid: zone id of the accounted pages |
Hugh Dickins | fa9add6 | 2012-05-29 15:07:09 -0700 | [diff] [blame] | 992 | * @nr_pages: positive when adding or negative when removing |
Johannes Weiner | 925b767 | 2012-01-12 17:18:15 -0800 | [diff] [blame] | 993 | * |
Hugh Dickins | ca70723 | 2016-05-19 17:12:35 -0700 | [diff] [blame] | 994 | * This function must be called under lru_lock, just before a page is added |
| 995 | * to or just after a page is removed from an lru list (that ordering being |
| 996 | * so as to allow it to check that lru_size 0 is consistent with list_empty). |
Johannes Weiner | 925b767 | 2012-01-12 17:18:15 -0800 | [diff] [blame] | 997 | */ |
Hugh Dickins | fa9add6 | 2012-05-29 15:07:09 -0700 | [diff] [blame] | 998 | void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, |
Michal Hocko | b4536f0c8 | 2017-01-10 16:58:04 -0800 | [diff] [blame] | 999 | int zid, int nr_pages) |
Johannes Weiner | 925b767 | 2012-01-12 17:18:15 -0800 | [diff] [blame] | 1000 | { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 1001 | struct mem_cgroup_per_node *mz; |
Hugh Dickins | fa9add6 | 2012-05-29 15:07:09 -0700 | [diff] [blame] | 1002 | unsigned long *lru_size; |
Hugh Dickins | ca70723 | 2016-05-19 17:12:35 -0700 | [diff] [blame] | 1003 | long size; |
Johannes Weiner | 925b767 | 2012-01-12 17:18:15 -0800 | [diff] [blame] | 1004 | |
| 1005 | if (mem_cgroup_disabled()) |
| 1006 | return; |
| 1007 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 1008 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); |
Michal Hocko | b4536f0c8 | 2017-01-10 16:58:04 -0800 | [diff] [blame] | 1009 | lru_size = &mz->lru_zone_size[zid][lru]; |
Hugh Dickins | ca70723 | 2016-05-19 17:12:35 -0700 | [diff] [blame] | 1010 | |
| 1011 | if (nr_pages < 0) |
| 1012 | *lru_size += nr_pages; |
| 1013 | |
| 1014 | size = *lru_size; |
Michal Hocko | b4536f0c8 | 2017-01-10 16:58:04 -0800 | [diff] [blame] | 1015 | if (WARN_ONCE(size < 0, |
| 1016 | "%s(%p, %d, %d): lru_size %ld\n", |
| 1017 | __func__, lruvec, lru, nr_pages, size)) { |
Hugh Dickins | ca70723 | 2016-05-19 17:12:35 -0700 | [diff] [blame] | 1018 | VM_BUG_ON(1); |
| 1019 | *lru_size = 0; |
| 1020 | } |
| 1021 | |
| 1022 | if (nr_pages > 0) |
| 1023 | *lru_size += nr_pages; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1024 | } |
KAMEZAWA Hiroyuki | 544122e | 2009-01-07 18:08:34 -0800 | [diff] [blame] | 1025 | |
Johannes Weiner | 2314b42 | 2014-12-10 15:44:33 -0800 | [diff] [blame] | 1026 | bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg) |
Johannes Weiner | c3ac9a8 | 2012-05-29 15:06:25 -0700 | [diff] [blame] | 1027 | { |
Johannes Weiner | 2314b42 | 2014-12-10 15:44:33 -0800 | [diff] [blame] | 1028 | struct mem_cgroup *task_memcg; |
KAMEZAWA Hiroyuki | 158e0a2 | 2010-08-10 18:03:00 -0700 | [diff] [blame] | 1029 | struct task_struct *p; |
David Rientjes | ffbdccf | 2013-07-03 15:01:23 -0700 | [diff] [blame] | 1030 | bool ret; |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 1031 | |
KAMEZAWA Hiroyuki | 158e0a2 | 2010-08-10 18:03:00 -0700 | [diff] [blame] | 1032 | p = find_lock_task_mm(task); |
David Rientjes | de077d2 | 2012-01-12 17:18:52 -0800 | [diff] [blame] | 1033 | if (p) { |
Johannes Weiner | 2314b42 | 2014-12-10 15:44:33 -0800 | [diff] [blame] | 1034 | task_memcg = get_mem_cgroup_from_mm(p->mm); |
David Rientjes | de077d2 | 2012-01-12 17:18:52 -0800 | [diff] [blame] | 1035 | task_unlock(p); |
| 1036 | } else { |
| 1037 | /* |
| 1038 | * All threads may have already detached their mm's, but the oom |
| 1039 | * killer still needs to detect if they have already been oom |
| 1040 | * killed to prevent needlessly killing additional tasks. |
| 1041 | */ |
David Rientjes | ffbdccf | 2013-07-03 15:01:23 -0700 | [diff] [blame] | 1042 | rcu_read_lock(); |
Johannes Weiner | 2314b42 | 2014-12-10 15:44:33 -0800 | [diff] [blame] | 1043 | task_memcg = mem_cgroup_from_task(task); |
| 1044 | css_get(&task_memcg->css); |
David Rientjes | ffbdccf | 2013-07-03 15:01:23 -0700 | [diff] [blame] | 1045 | rcu_read_unlock(); |
David Rientjes | de077d2 | 2012-01-12 17:18:52 -0800 | [diff] [blame] | 1046 | } |
Johannes Weiner | 2314b42 | 2014-12-10 15:44:33 -0800 | [diff] [blame] | 1047 | ret = mem_cgroup_is_descendant(task_memcg, memcg); |
| 1048 | css_put(&task_memcg->css); |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 1049 | return ret; |
| 1050 | } |
| 1051 | |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1052 | /** |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1053 | * mem_cgroup_margin - calculate chargeable space of a memory cgroup |
Wanpeng Li | dad7557 | 2012-06-20 12:53:01 -0700 | [diff] [blame] | 1054 | * @memcg: the memory cgroup |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1055 | * |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1056 | * Returns the maximum amount of memory @mem can be charged with, in |
Johannes Weiner | 7ec99d6 | 2011-03-23 16:42:36 -0700 | [diff] [blame] | 1057 | * pages. |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1058 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1059 | static unsigned long mem_cgroup_margin(struct mem_cgroup *memcg) |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1060 | { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1061 | unsigned long margin = 0; |
| 1062 | unsigned long count; |
| 1063 | unsigned long limit; |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1064 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1065 | count = page_counter_read(&memcg->memory); |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 1066 | limit = READ_ONCE(memcg->memory.limit); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1067 | if (count < limit) |
| 1068 | margin = limit - count; |
| 1069 | |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 1070 | if (do_memsw_account()) { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1071 | count = page_counter_read(&memcg->memsw); |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 1072 | limit = READ_ONCE(memcg->memsw.limit); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1073 | if (count <= limit) |
| 1074 | margin = min(margin, limit - count); |
Li RongQing | cbedbac | 2016-05-27 14:27:43 -0700 | [diff] [blame] | 1075 | else |
| 1076 | margin = 0; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1077 | } |
| 1078 | |
| 1079 | return margin; |
Johannes Weiner | 1994282 | 2011-02-01 15:52:43 -0800 | [diff] [blame] | 1080 | } |
| 1081 | |
KAMEZAWA Hiroyuki | 619d094 | 2012-03-21 16:34:23 -0700 | [diff] [blame] | 1082 | /* |
Qiang Huang | bdcbb65 | 2014-06-04 16:08:21 -0700 | [diff] [blame] | 1083 | * A routine for checking "mem" is under move_account() or not. |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1084 | * |
Qiang Huang | bdcbb65 | 2014-06-04 16:08:21 -0700 | [diff] [blame] | 1085 | * Checking a cgroup is mc.from or mc.to or under hierarchy of |
| 1086 | * moving cgroups. This is for waiting at high-memory pressure |
| 1087 | * caused by "move". |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1088 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1089 | static bool mem_cgroup_under_move(struct mem_cgroup *memcg) |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1090 | { |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 1091 | struct mem_cgroup *from; |
| 1092 | struct mem_cgroup *to; |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1093 | bool ret = false; |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 1094 | /* |
| 1095 | * Unlike task_move routines, we access mc.to, mc.from not under |
| 1096 | * mutual exclusion by cgroup_mutex. Here, we take spinlock instead. |
| 1097 | */ |
| 1098 | spin_lock(&mc.lock); |
| 1099 | from = mc.from; |
| 1100 | to = mc.to; |
| 1101 | if (!from) |
| 1102 | goto unlock; |
Michal Hocko | 3e92041 | 2011-07-26 16:08:29 -0700 | [diff] [blame] | 1103 | |
Johannes Weiner | 2314b42 | 2014-12-10 15:44:33 -0800 | [diff] [blame] | 1104 | ret = mem_cgroup_is_descendant(from, memcg) || |
| 1105 | mem_cgroup_is_descendant(to, memcg); |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 1106 | unlock: |
| 1107 | spin_unlock(&mc.lock); |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1108 | return ret; |
| 1109 | } |
| 1110 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1111 | static bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg) |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1112 | { |
| 1113 | if (mc.moving_task && current != mc.moving_task) { |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1114 | if (mem_cgroup_under_move(memcg)) { |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1115 | DEFINE_WAIT(wait); |
| 1116 | prepare_to_wait(&mc.waitq, &wait, TASK_INTERRUPTIBLE); |
| 1117 | /* moving charge context might have finished. */ |
| 1118 | if (mc.moving_task) |
| 1119 | schedule(); |
| 1120 | finish_wait(&mc.waitq, &wait); |
| 1121 | return true; |
| 1122 | } |
| 1123 | } |
| 1124 | return false; |
| 1125 | } |
| 1126 | |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 1127 | unsigned int memcg1_stats[] = { |
| 1128 | MEMCG_CACHE, |
| 1129 | MEMCG_RSS, |
| 1130 | MEMCG_RSS_HUGE, |
| 1131 | NR_SHMEM, |
| 1132 | NR_FILE_MAPPED, |
| 1133 | NR_FILE_DIRTY, |
| 1134 | NR_WRITEBACK, |
| 1135 | MEMCG_SWAP, |
| 1136 | }; |
| 1137 | |
| 1138 | static const char *const memcg1_stat_names[] = { |
| 1139 | "cache", |
| 1140 | "rss", |
| 1141 | "rss_huge", |
| 1142 | "shmem", |
| 1143 | "mapped_file", |
| 1144 | "dirty", |
| 1145 | "writeback", |
| 1146 | "swap", |
| 1147 | }; |
| 1148 | |
Sha Zhengju | 58cf188 | 2013-02-22 16:32:05 -0800 | [diff] [blame] | 1149 | #define K(x) ((x) << (PAGE_SHIFT-10)) |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1150 | /** |
Sha Zhengju | 58cf188 | 2013-02-22 16:32:05 -0800 | [diff] [blame] | 1151 | * mem_cgroup_print_oom_info: Print OOM information relevant to memory controller. |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1152 | * @memcg: The memory cgroup that went over limit |
| 1153 | * @p: Task that is going to be killed |
| 1154 | * |
| 1155 | * NOTE: @memcg and @p's mem_cgroup can be different when hierarchy is |
| 1156 | * enabled |
| 1157 | */ |
| 1158 | void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) |
| 1159 | { |
Sha Zhengju | 58cf188 | 2013-02-22 16:32:05 -0800 | [diff] [blame] | 1160 | struct mem_cgroup *iter; |
| 1161 | unsigned int i; |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1162 | |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1163 | rcu_read_lock(); |
| 1164 | |
Balasubramani Vivekanandan | 2415b9f | 2015-04-14 15:48:18 -0700 | [diff] [blame] | 1165 | if (p) { |
| 1166 | pr_info("Task in "); |
| 1167 | pr_cont_cgroup_path(task_cgroup(p, memory_cgrp_id)); |
| 1168 | pr_cont(" killed as a result of limit of "); |
| 1169 | } else { |
| 1170 | pr_info("Memory limit reached of cgroup "); |
| 1171 | } |
| 1172 | |
Tejun Heo | e61734c | 2014-02-12 09:29:50 -0500 | [diff] [blame] | 1173 | pr_cont_cgroup_path(memcg->css.cgroup); |
Greg Thelen | 0346dad | 2015-01-26 12:58:38 -0800 | [diff] [blame] | 1174 | pr_cont("\n"); |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1175 | |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1176 | rcu_read_unlock(); |
| 1177 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1178 | pr_info("memory: usage %llukB, limit %llukB, failcnt %lu\n", |
| 1179 | K((u64)page_counter_read(&memcg->memory)), |
| 1180 | K((u64)memcg->memory.limit), memcg->memory.failcnt); |
| 1181 | pr_info("memory+swap: usage %llukB, limit %llukB, failcnt %lu\n", |
| 1182 | K((u64)page_counter_read(&memcg->memsw)), |
| 1183 | K((u64)memcg->memsw.limit), memcg->memsw.failcnt); |
| 1184 | pr_info("kmem: usage %llukB, limit %llukB, failcnt %lu\n", |
| 1185 | K((u64)page_counter_read(&memcg->kmem)), |
| 1186 | K((u64)memcg->kmem.limit), memcg->kmem.failcnt); |
Sha Zhengju | 58cf188 | 2013-02-22 16:32:05 -0800 | [diff] [blame] | 1187 | |
| 1188 | for_each_mem_cgroup_tree(iter, memcg) { |
Tejun Heo | e61734c | 2014-02-12 09:29:50 -0500 | [diff] [blame] | 1189 | pr_info("Memory cgroup stats for "); |
| 1190 | pr_cont_cgroup_path(iter->css.cgroup); |
Sha Zhengju | 58cf188 | 2013-02-22 16:32:05 -0800 | [diff] [blame] | 1191 | pr_cont(":"); |
| 1192 | |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 1193 | for (i = 0; i < ARRAY_SIZE(memcg1_stats); i++) { |
| 1194 | if (memcg1_stats[i] == MEMCG_SWAP && !do_swap_account) |
Sha Zhengju | 58cf188 | 2013-02-22 16:32:05 -0800 | [diff] [blame] | 1195 | continue; |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 1196 | pr_cont(" %s:%luKB", memcg1_stat_names[i], |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 1197 | K(memcg_page_state(iter, memcg1_stats[i]))); |
Sha Zhengju | 58cf188 | 2013-02-22 16:32:05 -0800 | [diff] [blame] | 1198 | } |
| 1199 | |
| 1200 | for (i = 0; i < NR_LRU_LISTS; i++) |
| 1201 | pr_cont(" %s:%luKB", mem_cgroup_lru_names[i], |
| 1202 | K(mem_cgroup_nr_lru_pages(iter, BIT(i)))); |
| 1203 | |
| 1204 | pr_cont("\n"); |
| 1205 | } |
Balbir Singh | e222432 | 2009-04-02 16:57:39 -0700 | [diff] [blame] | 1206 | } |
| 1207 | |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1208 | /* |
| 1209 | * This function returns the number of memcg under hierarchy tree. Returns |
| 1210 | * 1(self count) if no children. |
| 1211 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1212 | static int mem_cgroup_count_children(struct mem_cgroup *memcg) |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1213 | { |
| 1214 | int num = 0; |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1215 | struct mem_cgroup *iter; |
| 1216 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1217 | for_each_mem_cgroup_tree(iter, memcg) |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1218 | num++; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 1219 | return num; |
| 1220 | } |
| 1221 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1222 | /* |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1223 | * Return the memory (and swap, if configured) limit for a memcg. |
| 1224 | */ |
Vladimir Davydov | 7c5f64f | 2016-10-07 16:57:23 -0700 | [diff] [blame] | 1225 | unsigned long mem_cgroup_get_limit(struct mem_cgroup *memcg) |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1226 | { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1227 | unsigned long limit; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1228 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1229 | limit = memcg->memory.limit; |
Michal Hocko | 9a5a8f1 | 2012-11-16 14:14:49 -0800 | [diff] [blame] | 1230 | if (mem_cgroup_swappiness(memcg)) { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1231 | unsigned long memsw_limit; |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 1232 | unsigned long swap_limit; |
Michal Hocko | 9a5a8f1 | 2012-11-16 14:14:49 -0800 | [diff] [blame] | 1233 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1234 | memsw_limit = memcg->memsw.limit; |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 1235 | swap_limit = memcg->swap.limit; |
| 1236 | swap_limit = min(swap_limit, (unsigned long)total_swap_pages); |
| 1237 | limit = min(limit + swap_limit, memsw_limit); |
Michal Hocko | 9a5a8f1 | 2012-11-16 14:14:49 -0800 | [diff] [blame] | 1238 | } |
Michal Hocko | 9a5a8f1 | 2012-11-16 14:14:49 -0800 | [diff] [blame] | 1239 | return limit; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1240 | } |
| 1241 | |
Johannes Weiner | b6e6edc | 2016-03-17 14:20:28 -0700 | [diff] [blame] | 1242 | static bool mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask, |
David Rientjes | 1996546 | 2012-12-11 16:00:26 -0800 | [diff] [blame] | 1243 | int order) |
David Rientjes | 9cbb78b | 2012-07-31 16:43:44 -0700 | [diff] [blame] | 1244 | { |
David Rientjes | 6e0fc46 | 2015-09-08 15:00:36 -0700 | [diff] [blame] | 1245 | struct oom_control oc = { |
| 1246 | .zonelist = NULL, |
| 1247 | .nodemask = NULL, |
Vladimir Davydov | 2a966b7 | 2016-07-26 15:22:33 -0700 | [diff] [blame] | 1248 | .memcg = memcg, |
David Rientjes | 6e0fc46 | 2015-09-08 15:00:36 -0700 | [diff] [blame] | 1249 | .gfp_mask = gfp_mask, |
| 1250 | .order = order, |
David Rientjes | 6e0fc46 | 2015-09-08 15:00:36 -0700 | [diff] [blame] | 1251 | }; |
Vladimir Davydov | 7c5f64f | 2016-10-07 16:57:23 -0700 | [diff] [blame] | 1252 | bool ret; |
David Rientjes | 9cbb78b | 2012-07-31 16:43:44 -0700 | [diff] [blame] | 1253 | |
Johannes Weiner | dc56401 | 2015-06-24 16:57:19 -0700 | [diff] [blame] | 1254 | mutex_lock(&oom_lock); |
Vladimir Davydov | 7c5f64f | 2016-10-07 16:57:23 -0700 | [diff] [blame] | 1255 | ret = out_of_memory(&oc); |
Johannes Weiner | dc56401 | 2015-06-24 16:57:19 -0700 | [diff] [blame] | 1256 | mutex_unlock(&oom_lock); |
Vladimir Davydov | 7c5f64f | 2016-10-07 16:57:23 -0700 | [diff] [blame] | 1257 | return ret; |
David Rientjes | 9cbb78b | 2012-07-31 16:43:44 -0700 | [diff] [blame] | 1258 | } |
| 1259 | |
Michele Curti | ae6e71d | 2014-12-12 16:56:35 -0800 | [diff] [blame] | 1260 | #if MAX_NUMNODES > 1 |
| 1261 | |
KAMEZAWA Hiroyuki | 4d0c066 | 2011-07-08 15:39:42 -0700 | [diff] [blame] | 1262 | /** |
| 1263 | * test_mem_cgroup_node_reclaimable |
Wanpeng Li | dad7557 | 2012-06-20 12:53:01 -0700 | [diff] [blame] | 1264 | * @memcg: the target memcg |
KAMEZAWA Hiroyuki | 4d0c066 | 2011-07-08 15:39:42 -0700 | [diff] [blame] | 1265 | * @nid: the node ID to be checked. |
| 1266 | * @noswap : specify true here if the user wants flle only information. |
| 1267 | * |
| 1268 | * This function returns whether the specified memcg contains any |
| 1269 | * reclaimable pages on a node. Returns true if there are any reclaimable |
| 1270 | * pages in the node. |
| 1271 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1272 | static bool test_mem_cgroup_node_reclaimable(struct mem_cgroup *memcg, |
KAMEZAWA Hiroyuki | 4d0c066 | 2011-07-08 15:39:42 -0700 | [diff] [blame] | 1273 | int nid, bool noswap) |
| 1274 | { |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1275 | if (mem_cgroup_node_nr_lru_pages(memcg, nid, LRU_ALL_FILE)) |
KAMEZAWA Hiroyuki | 4d0c066 | 2011-07-08 15:39:42 -0700 | [diff] [blame] | 1276 | return true; |
| 1277 | if (noswap || !total_swap_pages) |
| 1278 | return false; |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1279 | if (mem_cgroup_node_nr_lru_pages(memcg, nid, LRU_ALL_ANON)) |
KAMEZAWA Hiroyuki | 4d0c066 | 2011-07-08 15:39:42 -0700 | [diff] [blame] | 1280 | return true; |
| 1281 | return false; |
| 1282 | |
| 1283 | } |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1284 | |
| 1285 | /* |
| 1286 | * Always updating the nodemask is not very good - even if we have an empty |
| 1287 | * list or the wrong list here, we can start from some node and traverse all |
| 1288 | * nodes based on the zonelist. So update the list loosely once per 10 secs. |
| 1289 | * |
| 1290 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1291 | static void mem_cgroup_may_update_nodemask(struct mem_cgroup *memcg) |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1292 | { |
| 1293 | int nid; |
KAMEZAWA Hiroyuki | 453a9bf | 2011-07-08 15:39:43 -0700 | [diff] [blame] | 1294 | /* |
| 1295 | * numainfo_events > 0 means there was at least NUMAINFO_EVENTS_TARGET |
| 1296 | * pagein/pageout changes since the last update. |
| 1297 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1298 | if (!atomic_read(&memcg->numainfo_events)) |
KAMEZAWA Hiroyuki | 453a9bf | 2011-07-08 15:39:43 -0700 | [diff] [blame] | 1299 | return; |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1300 | if (atomic_inc_return(&memcg->numainfo_updating) > 1) |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1301 | return; |
| 1302 | |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1303 | /* make a nodemask where this memcg uses memory from */ |
Lai Jiangshan | 31aaea4 | 2012-12-12 13:51:27 -0800 | [diff] [blame] | 1304 | memcg->scan_nodes = node_states[N_MEMORY]; |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1305 | |
Lai Jiangshan | 31aaea4 | 2012-12-12 13:51:27 -0800 | [diff] [blame] | 1306 | for_each_node_mask(nid, node_states[N_MEMORY]) { |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1307 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1308 | if (!test_mem_cgroup_node_reclaimable(memcg, nid, false)) |
| 1309 | node_clear(nid, memcg->scan_nodes); |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1310 | } |
KAMEZAWA Hiroyuki | 453a9bf | 2011-07-08 15:39:43 -0700 | [diff] [blame] | 1311 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1312 | atomic_set(&memcg->numainfo_events, 0); |
| 1313 | atomic_set(&memcg->numainfo_updating, 0); |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1314 | } |
| 1315 | |
| 1316 | /* |
| 1317 | * Selecting a node where we start reclaim from. Because what we need is just |
| 1318 | * reducing usage counter, start from anywhere is O,K. Considering |
| 1319 | * memory reclaim from current node, there are pros. and cons. |
| 1320 | * |
| 1321 | * Freeing memory from current node means freeing memory from a node which |
| 1322 | * we'll use or we've used. So, it may make LRU bad. And if several threads |
| 1323 | * hit limits, it will see a contention on a node. But freeing from remote |
| 1324 | * node means more costs for memory reclaim because of memory latency. |
| 1325 | * |
| 1326 | * Now, we use round-robin. Better algorithm is welcomed. |
| 1327 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1328 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg) |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1329 | { |
| 1330 | int node; |
| 1331 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1332 | mem_cgroup_may_update_nodemask(memcg); |
| 1333 | node = memcg->last_scanned_node; |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1334 | |
Andrew Morton | 0edaf86 | 2016-05-19 17:10:58 -0700 | [diff] [blame] | 1335 | node = next_node_in(node, memcg->scan_nodes); |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1336 | /* |
Michal Hocko | fda3d69 | 2016-05-19 17:11:34 -0700 | [diff] [blame] | 1337 | * mem_cgroup_may_update_nodemask might have seen no reclaimmable pages |
| 1338 | * last time it really checked all the LRUs due to rate limiting. |
| 1339 | * Fallback to the current node in that case for simplicity. |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1340 | */ |
| 1341 | if (unlikely(node == MAX_NUMNODES)) |
| 1342 | node = numa_node_id(); |
| 1343 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1344 | memcg->last_scanned_node = node; |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1345 | return node; |
| 1346 | } |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1347 | #else |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1348 | int mem_cgroup_select_victim_node(struct mem_cgroup *memcg) |
Ying Han | 889976d | 2011-05-26 16:25:33 -0700 | [diff] [blame] | 1349 | { |
| 1350 | return 0; |
| 1351 | } |
| 1352 | #endif |
| 1353 | |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 1354 | static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg, |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 1355 | pg_data_t *pgdat, |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 1356 | gfp_t gfp_mask, |
| 1357 | unsigned long *total_scanned) |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1358 | { |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 1359 | struct mem_cgroup *victim = NULL; |
| 1360 | int total = 0; |
| 1361 | int loop = 0; |
| 1362 | unsigned long excess; |
| 1363 | unsigned long nr_scanned; |
| 1364 | struct mem_cgroup_reclaim_cookie reclaim = { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 1365 | .pgdat = pgdat, |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 1366 | .priority = 0, |
| 1367 | }; |
Johannes Weiner | 9d11ea9 | 2011-03-23 16:42:21 -0700 | [diff] [blame] | 1368 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1369 | excess = soft_limit_excess(root_memcg); |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1370 | |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 1371 | while (1) { |
| 1372 | victim = mem_cgroup_iter(root_memcg, victim, &reclaim); |
| 1373 | if (!victim) { |
| 1374 | loop++; |
| 1375 | if (loop >= 2) { |
| 1376 | /* |
| 1377 | * If we have not been able to reclaim |
| 1378 | * anything, it might because there are |
| 1379 | * no reclaimable pages under this hierarchy |
| 1380 | */ |
| 1381 | if (!total) |
| 1382 | break; |
| 1383 | /* |
| 1384 | * We want to do more targeted reclaim. |
| 1385 | * excess >> 2 is not to excessive so as to |
| 1386 | * reclaim too much, nor too less that we keep |
| 1387 | * coming back to reclaim from this cgroup |
| 1388 | */ |
| 1389 | if (total >= (excess >> 2) || |
| 1390 | (loop > MEM_CGROUP_MAX_RECLAIM_LOOPS)) |
| 1391 | break; |
| 1392 | } |
| 1393 | continue; |
| 1394 | } |
Mel Gorman | a9dd0a8 | 2016-07-28 15:46:02 -0700 | [diff] [blame] | 1395 | total += mem_cgroup_shrink_node(victim, gfp_mask, false, |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 1396 | pgdat, &nr_scanned); |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 1397 | *total_scanned += nr_scanned; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1398 | if (!soft_limit_excess(root_memcg)) |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 1399 | break; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1400 | } |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 1401 | mem_cgroup_iter_break(root_memcg, victim); |
| 1402 | return total; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1403 | } |
| 1404 | |
Johannes Weiner | 0056f4e | 2013-10-31 16:34:14 -0700 | [diff] [blame] | 1405 | #ifdef CONFIG_LOCKDEP |
| 1406 | static struct lockdep_map memcg_oom_lock_dep_map = { |
| 1407 | .name = "memcg_oom_lock", |
| 1408 | }; |
| 1409 | #endif |
| 1410 | |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1411 | static DEFINE_SPINLOCK(memcg_oom_lock); |
| 1412 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1413 | /* |
| 1414 | * Check OOM-Killer is already running under our hierarchy. |
| 1415 | * If someone is running, return false. |
| 1416 | */ |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1417 | static bool mem_cgroup_oom_trylock(struct mem_cgroup *memcg) |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1418 | { |
Michal Hocko | 79dfdac | 2011-07-26 16:08:23 -0700 | [diff] [blame] | 1419 | struct mem_cgroup *iter, *failed = NULL; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1420 | |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1421 | spin_lock(&memcg_oom_lock); |
| 1422 | |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 1423 | for_each_mem_cgroup_tree(iter, memcg) { |
Johannes Weiner | 23751be | 2011-08-25 15:59:16 -0700 | [diff] [blame] | 1424 | if (iter->oom_lock) { |
Michal Hocko | 79dfdac | 2011-07-26 16:08:23 -0700 | [diff] [blame] | 1425 | /* |
| 1426 | * this subtree of our hierarchy is already locked |
| 1427 | * so we cannot give a lock. |
| 1428 | */ |
Michal Hocko | 79dfdac | 2011-07-26 16:08:23 -0700 | [diff] [blame] | 1429 | failed = iter; |
Johannes Weiner | 9f3a0d0 | 2012-01-12 17:17:48 -0800 | [diff] [blame] | 1430 | mem_cgroup_iter_break(memcg, iter); |
| 1431 | break; |
Johannes Weiner | 23751be | 2011-08-25 15:59:16 -0700 | [diff] [blame] | 1432 | } else |
| 1433 | iter->oom_lock = true; |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1434 | } |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1435 | |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1436 | if (failed) { |
| 1437 | /* |
| 1438 | * OK, we failed to lock the whole subtree so we have |
| 1439 | * to clean up what we set up to the failing subtree |
| 1440 | */ |
| 1441 | for_each_mem_cgroup_tree(iter, memcg) { |
| 1442 | if (iter == failed) { |
| 1443 | mem_cgroup_iter_break(memcg, iter); |
| 1444 | break; |
| 1445 | } |
| 1446 | iter->oom_lock = false; |
Michal Hocko | 79dfdac | 2011-07-26 16:08:23 -0700 | [diff] [blame] | 1447 | } |
Johannes Weiner | 0056f4e | 2013-10-31 16:34:14 -0700 | [diff] [blame] | 1448 | } else |
| 1449 | mutex_acquire(&memcg_oom_lock_dep_map, 0, 1, _RET_IP_); |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1450 | |
| 1451 | spin_unlock(&memcg_oom_lock); |
| 1452 | |
| 1453 | return !failed; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1454 | } |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1455 | |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1456 | static void mem_cgroup_oom_unlock(struct mem_cgroup *memcg) |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1457 | { |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 1458 | struct mem_cgroup *iter; |
| 1459 | |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1460 | spin_lock(&memcg_oom_lock); |
Johannes Weiner | 0056f4e | 2013-10-31 16:34:14 -0700 | [diff] [blame] | 1461 | mutex_release(&memcg_oom_lock_dep_map, 1, _RET_IP_); |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1462 | for_each_mem_cgroup_tree(iter, memcg) |
Michal Hocko | 79dfdac | 2011-07-26 16:08:23 -0700 | [diff] [blame] | 1463 | iter->oom_lock = false; |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1464 | spin_unlock(&memcg_oom_lock); |
Michal Hocko | 79dfdac | 2011-07-26 16:08:23 -0700 | [diff] [blame] | 1465 | } |
| 1466 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1467 | static void mem_cgroup_mark_under_oom(struct mem_cgroup *memcg) |
Michal Hocko | 79dfdac | 2011-07-26 16:08:23 -0700 | [diff] [blame] | 1468 | { |
| 1469 | struct mem_cgroup *iter; |
| 1470 | |
Tejun Heo | c2b42d3 | 2015-06-24 16:58:23 -0700 | [diff] [blame] | 1471 | spin_lock(&memcg_oom_lock); |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1472 | for_each_mem_cgroup_tree(iter, memcg) |
Tejun Heo | c2b42d3 | 2015-06-24 16:58:23 -0700 | [diff] [blame] | 1473 | iter->under_oom++; |
| 1474 | spin_unlock(&memcg_oom_lock); |
Michal Hocko | 79dfdac | 2011-07-26 16:08:23 -0700 | [diff] [blame] | 1475 | } |
| 1476 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1477 | static void mem_cgroup_unmark_under_oom(struct mem_cgroup *memcg) |
Michal Hocko | 79dfdac | 2011-07-26 16:08:23 -0700 | [diff] [blame] | 1478 | { |
| 1479 | struct mem_cgroup *iter; |
| 1480 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1481 | /* |
| 1482 | * When a new child is created while the hierarchy is under oom, |
Tejun Heo | c2b42d3 | 2015-06-24 16:58:23 -0700 | [diff] [blame] | 1483 | * mem_cgroup_oom_lock() may not be called. Watch for underflow. |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1484 | */ |
Tejun Heo | c2b42d3 | 2015-06-24 16:58:23 -0700 | [diff] [blame] | 1485 | spin_lock(&memcg_oom_lock); |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1486 | for_each_mem_cgroup_tree(iter, memcg) |
Tejun Heo | c2b42d3 | 2015-06-24 16:58:23 -0700 | [diff] [blame] | 1487 | if (iter->under_oom > 0) |
| 1488 | iter->under_oom--; |
| 1489 | spin_unlock(&memcg_oom_lock); |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1490 | } |
| 1491 | |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1492 | static DECLARE_WAIT_QUEUE_HEAD(memcg_oom_waitq); |
| 1493 | |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1494 | struct oom_wait_info { |
Hugh Dickins | d79154b | 2012-03-21 16:34:18 -0700 | [diff] [blame] | 1495 | struct mem_cgroup *memcg; |
Ingo Molnar | ac6424b | 2017-06-20 12:06:13 +0200 | [diff] [blame] | 1496 | wait_queue_entry_t wait; |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1497 | }; |
| 1498 | |
Ingo Molnar | ac6424b | 2017-06-20 12:06:13 +0200 | [diff] [blame] | 1499 | static int memcg_oom_wake_function(wait_queue_entry_t *wait, |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1500 | unsigned mode, int sync, void *arg) |
| 1501 | { |
Hugh Dickins | d79154b | 2012-03-21 16:34:18 -0700 | [diff] [blame] | 1502 | struct mem_cgroup *wake_memcg = (struct mem_cgroup *)arg; |
| 1503 | struct mem_cgroup *oom_wait_memcg; |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1504 | struct oom_wait_info *oom_wait_info; |
| 1505 | |
| 1506 | oom_wait_info = container_of(wait, struct oom_wait_info, wait); |
Hugh Dickins | d79154b | 2012-03-21 16:34:18 -0700 | [diff] [blame] | 1507 | oom_wait_memcg = oom_wait_info->memcg; |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1508 | |
Johannes Weiner | 2314b42 | 2014-12-10 15:44:33 -0800 | [diff] [blame] | 1509 | if (!mem_cgroup_is_descendant(wake_memcg, oom_wait_memcg) && |
| 1510 | !mem_cgroup_is_descendant(oom_wait_memcg, wake_memcg)) |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1511 | return 0; |
KAMEZAWA Hiroyuki | dc98df5 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 1512 | return autoremove_wake_function(wait, mode, sync, arg); |
| 1513 | } |
| 1514 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1515 | static void memcg_oom_recover(struct mem_cgroup *memcg) |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1516 | { |
Tejun Heo | c2b42d3 | 2015-06-24 16:58:23 -0700 | [diff] [blame] | 1517 | /* |
| 1518 | * For the following lockless ->under_oom test, the only required |
| 1519 | * guarantee is that it must see the state asserted by an OOM when |
| 1520 | * this function is called as a result of userland actions |
| 1521 | * triggered by the notification of the OOM. This is trivially |
| 1522 | * achieved by invoking mem_cgroup_mark_under_oom() before |
| 1523 | * triggering notification. |
| 1524 | */ |
| 1525 | if (memcg && memcg->under_oom) |
Tejun Heo | f4b90b70 | 2015-06-24 16:58:21 -0700 | [diff] [blame] | 1526 | __wake_up(&memcg_oom_waitq, TASK_NORMAL, 0, memcg); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1527 | } |
| 1528 | |
Johannes Weiner | 3812c8c | 2013-09-12 15:13:44 -0700 | [diff] [blame] | 1529 | static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order) |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1530 | { |
Andrew Morton | d0db7af | 2016-06-08 15:33:47 -0700 | [diff] [blame] | 1531 | if (!current->memcg_may_oom) |
Johannes Weiner | 3812c8c | 2013-09-12 15:13:44 -0700 | [diff] [blame] | 1532 | return; |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1533 | /* |
Johannes Weiner | 4942642 | 2013-10-16 13:46:59 -0700 | [diff] [blame] | 1534 | * We are in the middle of the charge context here, so we |
| 1535 | * don't want to block when potentially sitting on a callstack |
| 1536 | * that holds all kinds of filesystem and mm locks. |
| 1537 | * |
| 1538 | * Also, the caller may handle a failed allocation gracefully |
| 1539 | * (like optional page cache readahead) and so an OOM killer |
| 1540 | * invocation might not even be necessary. |
| 1541 | * |
| 1542 | * That's why we don't do anything here except remember the |
| 1543 | * OOM context and then deal with it at the end of the page |
| 1544 | * fault when the stack is unwound, the locks are released, |
| 1545 | * and when we know whether the fault was overall successful. |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1546 | */ |
Johannes Weiner | 4942642 | 2013-10-16 13:46:59 -0700 | [diff] [blame] | 1547 | css_get(&memcg->css); |
Tejun Heo | 626ebc4 | 2015-11-05 18:46:09 -0800 | [diff] [blame] | 1548 | current->memcg_in_oom = memcg; |
| 1549 | current->memcg_oom_gfp_mask = mask; |
| 1550 | current->memcg_oom_order = order; |
Johannes Weiner | 4942642 | 2013-10-16 13:46:59 -0700 | [diff] [blame] | 1551 | } |
| 1552 | |
| 1553 | /** |
| 1554 | * mem_cgroup_oom_synchronize - complete memcg OOM handling |
| 1555 | * @handle: actually kill/wait or just clean up the OOM state |
| 1556 | * |
| 1557 | * This has to be called at the end of a page fault if the memcg OOM |
| 1558 | * handler was enabled. |
| 1559 | * |
| 1560 | * Memcg supports userspace OOM handling where failed allocations must |
| 1561 | * sleep on a waitqueue until the userspace task resolves the |
| 1562 | * situation. Sleeping directly in the charge context with all kinds |
| 1563 | * of locks held is not a good idea, instead we remember an OOM state |
| 1564 | * in the task and mem_cgroup_oom_synchronize() has to be called at |
| 1565 | * the end of the page fault to complete the OOM handling. |
| 1566 | * |
| 1567 | * Returns %true if an ongoing memcg OOM situation was detected and |
| 1568 | * completed, %false otherwise. |
| 1569 | */ |
| 1570 | bool mem_cgroup_oom_synchronize(bool handle) |
| 1571 | { |
Tejun Heo | 626ebc4 | 2015-11-05 18:46:09 -0800 | [diff] [blame] | 1572 | struct mem_cgroup *memcg = current->memcg_in_oom; |
Johannes Weiner | 4942642 | 2013-10-16 13:46:59 -0700 | [diff] [blame] | 1573 | struct oom_wait_info owait; |
| 1574 | bool locked; |
| 1575 | |
| 1576 | /* OOM is global, do not handle */ |
| 1577 | if (!memcg) |
| 1578 | return false; |
| 1579 | |
Vladimir Davydov | 7c5f64f | 2016-10-07 16:57:23 -0700 | [diff] [blame] | 1580 | if (!handle) |
Johannes Weiner | 4942642 | 2013-10-16 13:46:59 -0700 | [diff] [blame] | 1581 | goto cleanup; |
| 1582 | |
| 1583 | owait.memcg = memcg; |
| 1584 | owait.wait.flags = 0; |
| 1585 | owait.wait.func = memcg_oom_wake_function; |
| 1586 | owait.wait.private = current; |
Ingo Molnar | 2055da9 | 2017-06-20 12:06:46 +0200 | [diff] [blame] | 1587 | INIT_LIST_HEAD(&owait.wait.entry); |
Johannes Weiner | 4942642 | 2013-10-16 13:46:59 -0700 | [diff] [blame] | 1588 | |
| 1589 | prepare_to_wait(&memcg_oom_waitq, &owait.wait, TASK_KILLABLE); |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1590 | mem_cgroup_mark_under_oom(memcg); |
| 1591 | |
| 1592 | locked = mem_cgroup_oom_trylock(memcg); |
| 1593 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1594 | if (locked) |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1595 | mem_cgroup_oom_notify(memcg); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1596 | |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1597 | if (locked && !memcg->oom_kill_disable) { |
| 1598 | mem_cgroup_unmark_under_oom(memcg); |
Johannes Weiner | 4942642 | 2013-10-16 13:46:59 -0700 | [diff] [blame] | 1599 | finish_wait(&memcg_oom_waitq, &owait.wait); |
Tejun Heo | 626ebc4 | 2015-11-05 18:46:09 -0800 | [diff] [blame] | 1600 | mem_cgroup_out_of_memory(memcg, current->memcg_oom_gfp_mask, |
| 1601 | current->memcg_oom_order); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 1602 | } else { |
Johannes Weiner | 3812c8c | 2013-09-12 15:13:44 -0700 | [diff] [blame] | 1603 | schedule(); |
Johannes Weiner | 4942642 | 2013-10-16 13:46:59 -0700 | [diff] [blame] | 1604 | mem_cgroup_unmark_under_oom(memcg); |
| 1605 | finish_wait(&memcg_oom_waitq, &owait.wait); |
| 1606 | } |
| 1607 | |
| 1608 | if (locked) { |
Johannes Weiner | fb2a6fc | 2013-09-12 15:13:43 -0700 | [diff] [blame] | 1609 | mem_cgroup_oom_unlock(memcg); |
| 1610 | /* |
| 1611 | * There is no guarantee that an OOM-lock contender |
| 1612 | * sees the wakeups triggered by the OOM kill |
| 1613 | * uncharges. Wake any sleepers explicitely. |
| 1614 | */ |
| 1615 | memcg_oom_recover(memcg); |
| 1616 | } |
Johannes Weiner | 4942642 | 2013-10-16 13:46:59 -0700 | [diff] [blame] | 1617 | cleanup: |
Tejun Heo | 626ebc4 | 2015-11-05 18:46:09 -0800 | [diff] [blame] | 1618 | current->memcg_in_oom = NULL; |
Johannes Weiner | 3812c8c | 2013-09-12 15:13:44 -0700 | [diff] [blame] | 1619 | css_put(&memcg->css); |
KAMEZAWA Hiroyuki | 867578c | 2010-03-10 15:22:39 -0800 | [diff] [blame] | 1620 | return true; |
KAMEZAWA Hiroyuki | 0b7f569 | 2009-04-02 16:57:38 -0700 | [diff] [blame] | 1621 | } |
| 1622 | |
Johannes Weiner | d7365e7 | 2014-10-29 14:50:48 -0700 | [diff] [blame] | 1623 | /** |
Johannes Weiner | 81f8c3a | 2016-03-15 14:57:04 -0700 | [diff] [blame] | 1624 | * lock_page_memcg - lock a page->mem_cgroup binding |
| 1625 | * @page: the page |
KAMEZAWA Hiroyuki | 32047e2 | 2010-10-27 15:33:40 -0700 | [diff] [blame] | 1626 | * |
Johannes Weiner | 81f8c3a | 2016-03-15 14:57:04 -0700 | [diff] [blame] | 1627 | * This function protects unlocked LRU pages from being moved to |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1628 | * another cgroup. |
| 1629 | * |
| 1630 | * It ensures lifetime of the returned memcg. Caller is responsible |
| 1631 | * for the lifetime of the page; __unlock_page_memcg() is available |
| 1632 | * when @page might get freed inside the locked section. |
Balbir Singh | d69b042 | 2009-06-17 16:26:34 -0700 | [diff] [blame] | 1633 | */ |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1634 | struct mem_cgroup *lock_page_memcg(struct page *page) |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1635 | { |
| 1636 | struct mem_cgroup *memcg; |
Johannes Weiner | 6de2261 | 2015-02-11 15:25:01 -0800 | [diff] [blame] | 1637 | unsigned long flags; |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1638 | |
Johannes Weiner | 6de2261 | 2015-02-11 15:25:01 -0800 | [diff] [blame] | 1639 | /* |
| 1640 | * The RCU lock is held throughout the transaction. The fast |
| 1641 | * path can get away without acquiring the memcg->move_lock |
| 1642 | * because page moving starts with an RCU grace period. |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1643 | * |
| 1644 | * The RCU lock also protects the memcg from being freed when |
| 1645 | * the page state that is going to change is the only thing |
| 1646 | * preventing the page itself from being freed. E.g. writeback |
| 1647 | * doesn't hold a page reference and relies on PG_writeback to |
| 1648 | * keep off truncation, migration and so forth. |
| 1649 | */ |
Johannes Weiner | d7365e7 | 2014-10-29 14:50:48 -0700 | [diff] [blame] | 1650 | rcu_read_lock(); |
| 1651 | |
| 1652 | if (mem_cgroup_disabled()) |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1653 | return NULL; |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1654 | again: |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 1655 | memcg = page->mem_cgroup; |
Johannes Weiner | 2983331 | 2014-12-10 15:44:02 -0800 | [diff] [blame] | 1656 | if (unlikely(!memcg)) |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1657 | return NULL; |
Johannes Weiner | d7365e7 | 2014-10-29 14:50:48 -0700 | [diff] [blame] | 1658 | |
Qiang Huang | bdcbb65 | 2014-06-04 16:08:21 -0700 | [diff] [blame] | 1659 | if (atomic_read(&memcg->moving_account) <= 0) |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1660 | return memcg; |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1661 | |
Johannes Weiner | 6de2261 | 2015-02-11 15:25:01 -0800 | [diff] [blame] | 1662 | spin_lock_irqsave(&memcg->move_lock, flags); |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 1663 | if (memcg != page->mem_cgroup) { |
Johannes Weiner | 6de2261 | 2015-02-11 15:25:01 -0800 | [diff] [blame] | 1664 | spin_unlock_irqrestore(&memcg->move_lock, flags); |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1665 | goto again; |
| 1666 | } |
Johannes Weiner | 6de2261 | 2015-02-11 15:25:01 -0800 | [diff] [blame] | 1667 | |
| 1668 | /* |
| 1669 | * When charge migration first begins, we can have locked and |
| 1670 | * unlocked page stat updates happening concurrently. Track |
Johannes Weiner | 81f8c3a | 2016-03-15 14:57:04 -0700 | [diff] [blame] | 1671 | * the task who has the lock for unlock_page_memcg(). |
Johannes Weiner | 6de2261 | 2015-02-11 15:25:01 -0800 | [diff] [blame] | 1672 | */ |
| 1673 | memcg->move_lock_task = current; |
| 1674 | memcg->move_lock_flags = flags; |
Johannes Weiner | d7365e7 | 2014-10-29 14:50:48 -0700 | [diff] [blame] | 1675 | |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1676 | return memcg; |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1677 | } |
Johannes Weiner | 81f8c3a | 2016-03-15 14:57:04 -0700 | [diff] [blame] | 1678 | EXPORT_SYMBOL(lock_page_memcg); |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1679 | |
Johannes Weiner | d7365e7 | 2014-10-29 14:50:48 -0700 | [diff] [blame] | 1680 | /** |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1681 | * __unlock_page_memcg - unlock and unpin a memcg |
| 1682 | * @memcg: the memcg |
| 1683 | * |
| 1684 | * Unlock and unpin a memcg returned by lock_page_memcg(). |
Johannes Weiner | d7365e7 | 2014-10-29 14:50:48 -0700 | [diff] [blame] | 1685 | */ |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1686 | void __unlock_page_memcg(struct mem_cgroup *memcg) |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1687 | { |
Johannes Weiner | 6de2261 | 2015-02-11 15:25:01 -0800 | [diff] [blame] | 1688 | if (memcg && memcg->move_lock_task == current) { |
| 1689 | unsigned long flags = memcg->move_lock_flags; |
| 1690 | |
| 1691 | memcg->move_lock_task = NULL; |
| 1692 | memcg->move_lock_flags = 0; |
| 1693 | |
| 1694 | spin_unlock_irqrestore(&memcg->move_lock, flags); |
| 1695 | } |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1696 | |
Johannes Weiner | d7365e7 | 2014-10-29 14:50:48 -0700 | [diff] [blame] | 1697 | rcu_read_unlock(); |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1698 | } |
Johannes Weiner | 739f79f | 2017-08-18 15:15:48 -0700 | [diff] [blame] | 1699 | |
| 1700 | /** |
| 1701 | * unlock_page_memcg - unlock a page->mem_cgroup binding |
| 1702 | * @page: the page |
| 1703 | */ |
| 1704 | void unlock_page_memcg(struct page *page) |
| 1705 | { |
| 1706 | __unlock_page_memcg(page->mem_cgroup); |
| 1707 | } |
Johannes Weiner | 81f8c3a | 2016-03-15 14:57:04 -0700 | [diff] [blame] | 1708 | EXPORT_SYMBOL(unlock_page_memcg); |
KAMEZAWA Hiroyuki | 89c06bd | 2012-03-21 16:34:25 -0700 | [diff] [blame] | 1709 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1710 | /* |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1711 | * size of first charge trial. "32" comes from vmscan.c's magic value. |
| 1712 | * TODO: maybe necessary to use big numbers in big irons. |
| 1713 | */ |
Johannes Weiner | 7ec99d6 | 2011-03-23 16:42:36 -0700 | [diff] [blame] | 1714 | #define CHARGE_BATCH 32U |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1715 | struct memcg_stock_pcp { |
| 1716 | struct mem_cgroup *cached; /* this never be root cgroup */ |
Johannes Weiner | 11c9ea4 | 2011-03-23 16:42:34 -0700 | [diff] [blame] | 1717 | unsigned int nr_pages; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1718 | struct work_struct work; |
KAMEZAWA Hiroyuki | 26fe616 | 2011-06-15 15:08:45 -0700 | [diff] [blame] | 1719 | unsigned long flags; |
Kirill A. Shutemov | a0db00f | 2012-05-29 15:06:56 -0700 | [diff] [blame] | 1720 | #define FLUSHING_CACHED_CHARGE 0 |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1721 | }; |
| 1722 | static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock); |
Michal Hocko | 9f50fad | 2011-08-09 11:56:26 +0200 | [diff] [blame] | 1723 | static DEFINE_MUTEX(percpu_charge_mutex); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1724 | |
Suleiman Souhlal | a0956d5 | 2012-12-18 14:21:36 -0800 | [diff] [blame] | 1725 | /** |
| 1726 | * consume_stock: Try to consume stocked charge on this cpu. |
| 1727 | * @memcg: memcg to consume from. |
| 1728 | * @nr_pages: how many pages to charge. |
| 1729 | * |
| 1730 | * The charges will only happen if @memcg matches the current cpu's memcg |
| 1731 | * stock, and at least @nr_pages are available in that stock. Failure to |
| 1732 | * service an allocation will refill the stock. |
| 1733 | * |
| 1734 | * returns true if successful, false otherwise. |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1735 | */ |
Suleiman Souhlal | a0956d5 | 2012-12-18 14:21:36 -0800 | [diff] [blame] | 1736 | static bool consume_stock(struct mem_cgroup *memcg, unsigned int nr_pages) |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1737 | { |
| 1738 | struct memcg_stock_pcp *stock; |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1739 | unsigned long flags; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1740 | bool ret = false; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1741 | |
Suleiman Souhlal | a0956d5 | 2012-12-18 14:21:36 -0800 | [diff] [blame] | 1742 | if (nr_pages > CHARGE_BATCH) |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1743 | return ret; |
Suleiman Souhlal | a0956d5 | 2012-12-18 14:21:36 -0800 | [diff] [blame] | 1744 | |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1745 | local_irq_save(flags); |
| 1746 | |
| 1747 | stock = this_cpu_ptr(&memcg_stock); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1748 | if (memcg == stock->cached && stock->nr_pages >= nr_pages) { |
Suleiman Souhlal | a0956d5 | 2012-12-18 14:21:36 -0800 | [diff] [blame] | 1749 | stock->nr_pages -= nr_pages; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1750 | ret = true; |
| 1751 | } |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1752 | |
| 1753 | local_irq_restore(flags); |
| 1754 | |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1755 | return ret; |
| 1756 | } |
| 1757 | |
| 1758 | /* |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1759 | * Returns stocks cached in percpu and reset cached information. |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1760 | */ |
| 1761 | static void drain_stock(struct memcg_stock_pcp *stock) |
| 1762 | { |
| 1763 | struct mem_cgroup *old = stock->cached; |
| 1764 | |
Johannes Weiner | 11c9ea4 | 2011-03-23 16:42:34 -0700 | [diff] [blame] | 1765 | if (stock->nr_pages) { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1766 | page_counter_uncharge(&old->memory, stock->nr_pages); |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 1767 | if (do_memsw_account()) |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1768 | page_counter_uncharge(&old->memsw, stock->nr_pages); |
Johannes Weiner | e8ea14c | 2014-12-10 15:42:42 -0800 | [diff] [blame] | 1769 | css_put_many(&old->css, stock->nr_pages); |
Johannes Weiner | 11c9ea4 | 2011-03-23 16:42:34 -0700 | [diff] [blame] | 1770 | stock->nr_pages = 0; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1771 | } |
| 1772 | stock->cached = NULL; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1773 | } |
| 1774 | |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1775 | static void drain_local_stock(struct work_struct *dummy) |
| 1776 | { |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1777 | struct memcg_stock_pcp *stock; |
| 1778 | unsigned long flags; |
| 1779 | |
Michal Hocko | 72f0184 | 2017-10-03 16:14:53 -0700 | [diff] [blame] | 1780 | /* |
| 1781 | * The only protection from memory hotplug vs. drain_stock races is |
| 1782 | * that we always operate on local CPU stock here with IRQ disabled |
| 1783 | */ |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1784 | local_irq_save(flags); |
| 1785 | |
| 1786 | stock = this_cpu_ptr(&memcg_stock); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1787 | drain_stock(stock); |
KAMEZAWA Hiroyuki | 26fe616 | 2011-06-15 15:08:45 -0700 | [diff] [blame] | 1788 | clear_bit(FLUSHING_CACHED_CHARGE, &stock->flags); |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1789 | |
| 1790 | local_irq_restore(flags); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1791 | } |
| 1792 | |
| 1793 | /* |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1794 | * Cache charges(val) to local per_cpu area. |
Greg Thelen | 320cc51 | 2010-03-15 15:27:28 +0100 | [diff] [blame] | 1795 | * This will be consumed by consume_stock() function, later. |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1796 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1797 | static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages) |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1798 | { |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1799 | struct memcg_stock_pcp *stock; |
| 1800 | unsigned long flags; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1801 | |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1802 | local_irq_save(flags); |
| 1803 | |
| 1804 | stock = this_cpu_ptr(&memcg_stock); |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1805 | if (stock->cached != memcg) { /* reset if necessary */ |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1806 | drain_stock(stock); |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1807 | stock->cached = memcg; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1808 | } |
Johannes Weiner | 11c9ea4 | 2011-03-23 16:42:34 -0700 | [diff] [blame] | 1809 | stock->nr_pages += nr_pages; |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1810 | |
Roman Gushchin | 475d048 | 2017-09-08 16:13:09 -0700 | [diff] [blame] | 1811 | if (stock->nr_pages > CHARGE_BATCH) |
| 1812 | drain_stock(stock); |
| 1813 | |
Johannes Weiner | db2ba40c | 2016-09-19 14:44:36 -0700 | [diff] [blame] | 1814 | local_irq_restore(flags); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1815 | } |
| 1816 | |
| 1817 | /* |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1818 | * Drains all per-CPU charge caches for given root_memcg resp. subtree |
Johannes Weiner | 6d3d6aa | 2014-12-10 15:42:50 -0800 | [diff] [blame] | 1819 | * of the hierarchy under it. |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1820 | */ |
Johannes Weiner | 6d3d6aa | 2014-12-10 15:42:50 -0800 | [diff] [blame] | 1821 | static void drain_all_stock(struct mem_cgroup *root_memcg) |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1822 | { |
KAMEZAWA Hiroyuki | 26fe616 | 2011-06-15 15:08:45 -0700 | [diff] [blame] | 1823 | int cpu, curcpu; |
Michal Hocko | d38144b | 2011-07-26 16:08:28 -0700 | [diff] [blame] | 1824 | |
Johannes Weiner | 6d3d6aa | 2014-12-10 15:42:50 -0800 | [diff] [blame] | 1825 | /* If someone's already draining, avoid adding running more workers. */ |
| 1826 | if (!mutex_trylock(&percpu_charge_mutex)) |
| 1827 | return; |
Michal Hocko | 72f0184 | 2017-10-03 16:14:53 -0700 | [diff] [blame] | 1828 | /* |
| 1829 | * Notify other cpus that system-wide "drain" is running |
| 1830 | * We do not care about races with the cpu hotplug because cpu down |
| 1831 | * as well as workers from this path always operate on the local |
| 1832 | * per-cpu data. CPU up doesn't touch memcg_stock at all. |
| 1833 | */ |
Johannes Weiner | 5af12d0 | 2011-08-25 15:59:07 -0700 | [diff] [blame] | 1834 | curcpu = get_cpu(); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1835 | for_each_online_cpu(cpu) { |
| 1836 | struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu); |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1837 | struct mem_cgroup *memcg; |
KAMEZAWA Hiroyuki | 26fe616 | 2011-06-15 15:08:45 -0700 | [diff] [blame] | 1838 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 1839 | memcg = stock->cached; |
Michal Hocko | 72f0184 | 2017-10-03 16:14:53 -0700 | [diff] [blame] | 1840 | if (!memcg || !stock->nr_pages || !css_tryget(&memcg->css)) |
KAMEZAWA Hiroyuki | 26fe616 | 2011-06-15 15:08:45 -0700 | [diff] [blame] | 1841 | continue; |
Michal Hocko | 72f0184 | 2017-10-03 16:14:53 -0700 | [diff] [blame] | 1842 | if (!mem_cgroup_is_descendant(memcg, root_memcg)) { |
| 1843 | css_put(&memcg->css); |
Michal Hocko | 3e92041 | 2011-07-26 16:08:29 -0700 | [diff] [blame] | 1844 | continue; |
Michal Hocko | 72f0184 | 2017-10-03 16:14:53 -0700 | [diff] [blame] | 1845 | } |
Michal Hocko | d1a05b6 | 2011-07-26 16:08:27 -0700 | [diff] [blame] | 1846 | if (!test_and_set_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) { |
| 1847 | if (cpu == curcpu) |
| 1848 | drain_local_stock(&stock->work); |
| 1849 | else |
| 1850 | schedule_work_on(cpu, &stock->work); |
| 1851 | } |
Michal Hocko | 72f0184 | 2017-10-03 16:14:53 -0700 | [diff] [blame] | 1852 | css_put(&memcg->css); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1853 | } |
Johannes Weiner | 5af12d0 | 2011-08-25 15:59:07 -0700 | [diff] [blame] | 1854 | put_cpu(); |
Michal Hocko | 9f50fad | 2011-08-09 11:56:26 +0200 | [diff] [blame] | 1855 | mutex_unlock(&percpu_charge_mutex); |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1856 | } |
| 1857 | |
Sebastian Andrzej Siewior | 308167f | 2016-11-03 15:49:59 +0100 | [diff] [blame] | 1858 | static int memcg_hotplug_cpu_dead(unsigned int cpu) |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1859 | { |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1860 | struct memcg_stock_pcp *stock; |
| 1861 | |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1862 | stock = &per_cpu(memcg_stock, cpu); |
| 1863 | drain_stock(stock); |
Sebastian Andrzej Siewior | 308167f | 2016-11-03 15:49:59 +0100 | [diff] [blame] | 1864 | return 0; |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1865 | } |
| 1866 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 1867 | static void reclaim_high(struct mem_cgroup *memcg, |
| 1868 | unsigned int nr_pages, |
| 1869 | gfp_t gfp_mask) |
| 1870 | { |
| 1871 | do { |
| 1872 | if (page_counter_read(&memcg->memory) <= memcg->high) |
| 1873 | continue; |
Johannes Weiner | 31176c7 | 2017-05-03 14:55:07 -0700 | [diff] [blame] | 1874 | mem_cgroup_event(memcg, MEMCG_HIGH); |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 1875 | try_to_free_mem_cgroup_pages(memcg, nr_pages, gfp_mask, true); |
| 1876 | } while ((memcg = parent_mem_cgroup(memcg))); |
| 1877 | } |
| 1878 | |
| 1879 | static void high_work_func(struct work_struct *work) |
| 1880 | { |
| 1881 | struct mem_cgroup *memcg; |
| 1882 | |
| 1883 | memcg = container_of(work, struct mem_cgroup, high_work); |
| 1884 | reclaim_high(memcg, CHARGE_BATCH, GFP_KERNEL); |
| 1885 | } |
| 1886 | |
Tejun Heo | b23afb9 | 2015-11-05 18:46:11 -0800 | [diff] [blame] | 1887 | /* |
| 1888 | * Scheduled by try_charge() to be executed from the userland return path |
| 1889 | * and reclaims memory over the high limit. |
| 1890 | */ |
| 1891 | void mem_cgroup_handle_over_high(void) |
| 1892 | { |
| 1893 | unsigned int nr_pages = current->memcg_nr_pages_over_high; |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 1894 | struct mem_cgroup *memcg; |
Tejun Heo | b23afb9 | 2015-11-05 18:46:11 -0800 | [diff] [blame] | 1895 | |
| 1896 | if (likely(!nr_pages)) |
| 1897 | return; |
| 1898 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 1899 | memcg = get_mem_cgroup_from_mm(current->mm); |
| 1900 | reclaim_high(memcg, nr_pages, GFP_KERNEL); |
Tejun Heo | b23afb9 | 2015-11-05 18:46:11 -0800 | [diff] [blame] | 1901 | css_put(&memcg->css); |
| 1902 | current->memcg_nr_pages_over_high = 0; |
| 1903 | } |
| 1904 | |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 1905 | static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask, |
| 1906 | unsigned int nr_pages) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1907 | { |
Johannes Weiner | 7ec99d6 | 2011-03-23 16:42:36 -0700 | [diff] [blame] | 1908 | unsigned int batch = max(CHARGE_BATCH, nr_pages); |
Johannes Weiner | 9b13061 | 2014-08-06 16:05:51 -0700 | [diff] [blame] | 1909 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1910 | struct mem_cgroup *mem_over_limit; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1911 | struct page_counter *counter; |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1912 | unsigned long nr_reclaimed; |
Johannes Weiner | b70a2a2 | 2014-10-09 15:28:56 -0700 | [diff] [blame] | 1913 | bool may_swap = true; |
| 1914 | bool drained = false; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 1915 | |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 1916 | if (mem_cgroup_is_root(memcg)) |
Tejun Heo | 10d53c7 | 2015-11-05 18:46:17 -0800 | [diff] [blame] | 1917 | return 0; |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1918 | retry: |
Michal Hocko | b6b6cc7 | 2014-04-07 15:37:44 -0700 | [diff] [blame] | 1919 | if (consume_stock(memcg, nr_pages)) |
Tejun Heo | 10d53c7 | 2015-11-05 18:46:17 -0800 | [diff] [blame] | 1920 | return 0; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1921 | |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 1922 | if (!do_memsw_account() || |
Johannes Weiner | 6071ca5 | 2015-11-05 18:50:26 -0800 | [diff] [blame] | 1923 | page_counter_try_charge(&memcg->memsw, batch, &counter)) { |
| 1924 | if (page_counter_try_charge(&memcg->memory, batch, &counter)) |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1925 | goto done_restock; |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 1926 | if (do_memsw_account()) |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1927 | page_counter_uncharge(&memcg->memsw, batch); |
| 1928 | mem_over_limit = mem_cgroup_from_counter(counter, memory); |
Johannes Weiner | 3fbe724 | 2014-10-09 15:28:54 -0700 | [diff] [blame] | 1929 | } else { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 1930 | mem_over_limit = mem_cgroup_from_counter(counter, memsw); |
Johannes Weiner | b70a2a2 | 2014-10-09 15:28:56 -0700 | [diff] [blame] | 1931 | may_swap = false; |
Johannes Weiner | 3fbe724 | 2014-10-09 15:28:54 -0700 | [diff] [blame] | 1932 | } |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1933 | |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1934 | if (batch > nr_pages) { |
| 1935 | batch = nr_pages; |
| 1936 | goto retry; |
| 1937 | } |
KAMEZAWA Hiroyuki | cdec2e4 | 2009-12-15 16:47:08 -0800 | [diff] [blame] | 1938 | |
Johannes Weiner | 06b078f | 2014-08-06 16:05:44 -0700 | [diff] [blame] | 1939 | /* |
| 1940 | * Unlike in global OOM situations, memcg is not in a physical |
| 1941 | * memory shortage. Allow dying and OOM-killed tasks to |
| 1942 | * bypass the last charges so that they can exit quickly and |
| 1943 | * free their memory. |
| 1944 | */ |
Michal Hocko | da99ecf | 2017-09-06 16:24:53 -0700 | [diff] [blame] | 1945 | if (unlikely(tsk_is_oom_victim(current) || |
Johannes Weiner | 06b078f | 2014-08-06 16:05:44 -0700 | [diff] [blame] | 1946 | fatal_signal_pending(current) || |
| 1947 | current->flags & PF_EXITING)) |
Tejun Heo | 10d53c7 | 2015-11-05 18:46:17 -0800 | [diff] [blame] | 1948 | goto force; |
Johannes Weiner | 06b078f | 2014-08-06 16:05:44 -0700 | [diff] [blame] | 1949 | |
Johannes Weiner | 89a2848 | 2016-10-27 17:46:56 -0700 | [diff] [blame] | 1950 | /* |
| 1951 | * Prevent unbounded recursion when reclaim operations need to |
| 1952 | * allocate memory. This might exceed the limits temporarily, |
| 1953 | * but we prefer facilitating memory reclaim and getting back |
| 1954 | * under the limit over triggering OOM kills in these cases. |
| 1955 | */ |
| 1956 | if (unlikely(current->flags & PF_MEMALLOC)) |
| 1957 | goto force; |
| 1958 | |
Johannes Weiner | 06b078f | 2014-08-06 16:05:44 -0700 | [diff] [blame] | 1959 | if (unlikely(task_in_memcg_oom(current))) |
| 1960 | goto nomem; |
| 1961 | |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1962 | if (!gfpflags_allow_blocking(gfp_mask)) |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1963 | goto nomem; |
KAMEZAWA Hiroyuki | 4b53433 | 2010-08-10 18:02:57 -0700 | [diff] [blame] | 1964 | |
Johannes Weiner | 31176c7 | 2017-05-03 14:55:07 -0700 | [diff] [blame] | 1965 | mem_cgroup_event(mem_over_limit, MEMCG_MAX); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 1966 | |
Johannes Weiner | b70a2a2 | 2014-10-09 15:28:56 -0700 | [diff] [blame] | 1967 | nr_reclaimed = try_to_free_mem_cgroup_pages(mem_over_limit, nr_pages, |
| 1968 | gfp_mask, may_swap); |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1969 | |
Johannes Weiner | 61e02c7 | 2014-08-06 16:08:16 -0700 | [diff] [blame] | 1970 | if (mem_cgroup_margin(mem_over_limit) >= nr_pages) |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1971 | goto retry; |
Johannes Weiner | 28c34c2 | 2014-08-06 16:05:47 -0700 | [diff] [blame] | 1972 | |
Johannes Weiner | b70a2a2 | 2014-10-09 15:28:56 -0700 | [diff] [blame] | 1973 | if (!drained) { |
Johannes Weiner | 6d3d6aa | 2014-12-10 15:42:50 -0800 | [diff] [blame] | 1974 | drain_all_stock(mem_over_limit); |
Johannes Weiner | b70a2a2 | 2014-10-09 15:28:56 -0700 | [diff] [blame] | 1975 | drained = true; |
| 1976 | goto retry; |
| 1977 | } |
| 1978 | |
Johannes Weiner | 28c34c2 | 2014-08-06 16:05:47 -0700 | [diff] [blame] | 1979 | if (gfp_mask & __GFP_NORETRY) |
| 1980 | goto nomem; |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1981 | /* |
| 1982 | * Even though the limit is exceeded at this point, reclaim |
| 1983 | * may have been able to free some pages. Retry the charge |
| 1984 | * before killing the task. |
| 1985 | * |
| 1986 | * Only for regular pages, though: huge pages are rather |
| 1987 | * unlikely to succeed so close to the limit, and we fall back |
| 1988 | * to regular pages anyway in case of failure. |
| 1989 | */ |
Johannes Weiner | 61e02c7 | 2014-08-06 16:08:16 -0700 | [diff] [blame] | 1990 | if (nr_reclaimed && nr_pages <= (1 << PAGE_ALLOC_COSTLY_ORDER)) |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 1991 | goto retry; |
| 1992 | /* |
| 1993 | * At task move, charge accounts can be doubly counted. So, it's |
| 1994 | * better to wait until the end of task_move if something is going on. |
| 1995 | */ |
| 1996 | if (mem_cgroup_wait_acct_move(mem_over_limit)) |
| 1997 | goto retry; |
| 1998 | |
Johannes Weiner | 9b13061 | 2014-08-06 16:05:51 -0700 | [diff] [blame] | 1999 | if (nr_retries--) |
| 2000 | goto retry; |
| 2001 | |
Johannes Weiner | 06b078f | 2014-08-06 16:05:44 -0700 | [diff] [blame] | 2002 | if (gfp_mask & __GFP_NOFAIL) |
Tejun Heo | 10d53c7 | 2015-11-05 18:46:17 -0800 | [diff] [blame] | 2003 | goto force; |
Johannes Weiner | 06b078f | 2014-08-06 16:05:44 -0700 | [diff] [blame] | 2004 | |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 2005 | if (fatal_signal_pending(current)) |
Tejun Heo | 10d53c7 | 2015-11-05 18:46:17 -0800 | [diff] [blame] | 2006 | goto force; |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 2007 | |
Johannes Weiner | 31176c7 | 2017-05-03 14:55:07 -0700 | [diff] [blame] | 2008 | mem_cgroup_event(mem_over_limit, MEMCG_OOM); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 2009 | |
Jerome Marchand | 3608de0 | 2015-11-05 18:47:29 -0800 | [diff] [blame] | 2010 | mem_cgroup_oom(mem_over_limit, gfp_mask, |
| 2011 | get_order(nr_pages * PAGE_SIZE)); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2012 | nomem: |
Johannes Weiner | 6d1fdc4 | 2014-04-07 15:37:45 -0700 | [diff] [blame] | 2013 | if (!(gfp_mask & __GFP_NOFAIL)) |
Johannes Weiner | 3168ecb | 2013-10-31 16:34:13 -0700 | [diff] [blame] | 2014 | return -ENOMEM; |
Tejun Heo | 10d53c7 | 2015-11-05 18:46:17 -0800 | [diff] [blame] | 2015 | force: |
| 2016 | /* |
| 2017 | * The allocation either can't fail or will lead to more memory |
| 2018 | * being freed very soon. Allow memory usage go over the limit |
| 2019 | * temporarily by force charging it. |
| 2020 | */ |
| 2021 | page_counter_charge(&memcg->memory, nr_pages); |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 2022 | if (do_memsw_account()) |
Tejun Heo | 10d53c7 | 2015-11-05 18:46:17 -0800 | [diff] [blame] | 2023 | page_counter_charge(&memcg->memsw, nr_pages); |
| 2024 | css_get_many(&memcg->css, nr_pages); |
| 2025 | |
| 2026 | return 0; |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 2027 | |
| 2028 | done_restock: |
Johannes Weiner | e8ea14c | 2014-12-10 15:42:42 -0800 | [diff] [blame] | 2029 | css_get_many(&memcg->css, batch); |
Johannes Weiner | 6539cc0 | 2014-08-06 16:05:42 -0700 | [diff] [blame] | 2030 | if (batch > nr_pages) |
| 2031 | refill_stock(memcg, batch - nr_pages); |
Tejun Heo | b23afb9 | 2015-11-05 18:46:11 -0800 | [diff] [blame] | 2032 | |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 2033 | /* |
Tejun Heo | b23afb9 | 2015-11-05 18:46:11 -0800 | [diff] [blame] | 2034 | * If the hierarchy is above the normal consumption range, schedule |
| 2035 | * reclaim on returning to userland. We can perform reclaim here |
Mel Gorman | 71baba4 | 2015-11-06 16:28:28 -0800 | [diff] [blame] | 2036 | * if __GFP_RECLAIM but let's always punt for simplicity and so that |
Tejun Heo | b23afb9 | 2015-11-05 18:46:11 -0800 | [diff] [blame] | 2037 | * GFP_KERNEL can consistently be used during reclaim. @memcg is |
| 2038 | * not recorded as it most likely matches current's and won't |
| 2039 | * change in the meantime. As high limit is checked again before |
| 2040 | * reclaim, the cost of mismatch is negligible. |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 2041 | */ |
| 2042 | do { |
Tejun Heo | b23afb9 | 2015-11-05 18:46:11 -0800 | [diff] [blame] | 2043 | if (page_counter_read(&memcg->memory) > memcg->high) { |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 2044 | /* Don't bother a random interrupted task */ |
| 2045 | if (in_interrupt()) { |
| 2046 | schedule_work(&memcg->high_work); |
| 2047 | break; |
| 2048 | } |
Vladimir Davydov | 9516a18 | 2015-12-11 13:40:24 -0800 | [diff] [blame] | 2049 | current->memcg_nr_pages_over_high += batch; |
Tejun Heo | b23afb9 | 2015-11-05 18:46:11 -0800 | [diff] [blame] | 2050 | set_notify_resume(current); |
| 2051 | break; |
| 2052 | } |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 2053 | } while ((memcg = parent_mem_cgroup(memcg))); |
Tejun Heo | 10d53c7 | 2015-11-05 18:46:17 -0800 | [diff] [blame] | 2054 | |
| 2055 | return 0; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2056 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2057 | |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 2058 | static void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages) |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 2059 | { |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2060 | if (mem_cgroup_is_root(memcg)) |
| 2061 | return; |
| 2062 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2063 | page_counter_uncharge(&memcg->memory, nr_pages); |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 2064 | if (do_memsw_account()) |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2065 | page_counter_uncharge(&memcg->memsw, nr_pages); |
Daisuke Nishimura | a3032a2 | 2009-12-15 16:47:10 -0800 | [diff] [blame] | 2066 | |
Johannes Weiner | e8ea14c | 2014-12-10 15:42:42 -0800 | [diff] [blame] | 2067 | css_put_many(&memcg->css, nr_pages); |
KAMEZAWA Hiroyuki | d01dd17 | 2012-05-29 15:07:03 -0700 | [diff] [blame] | 2068 | } |
| 2069 | |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2070 | static void lock_page_lru(struct page *page, int *isolated) |
| 2071 | { |
| 2072 | struct zone *zone = page_zone(page); |
| 2073 | |
Mel Gorman | a52633d | 2016-07-28 15:45:28 -0700 | [diff] [blame] | 2074 | spin_lock_irq(zone_lru_lock(zone)); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2075 | if (PageLRU(page)) { |
| 2076 | struct lruvec *lruvec; |
| 2077 | |
Mel Gorman | 599d0c9 | 2016-07-28 15:45:31 -0700 | [diff] [blame] | 2078 | lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2079 | ClearPageLRU(page); |
| 2080 | del_page_from_lru_list(page, lruvec, page_lru(page)); |
| 2081 | *isolated = 1; |
| 2082 | } else |
| 2083 | *isolated = 0; |
| 2084 | } |
| 2085 | |
| 2086 | static void unlock_page_lru(struct page *page, int isolated) |
| 2087 | { |
| 2088 | struct zone *zone = page_zone(page); |
| 2089 | |
| 2090 | if (isolated) { |
| 2091 | struct lruvec *lruvec; |
| 2092 | |
Mel Gorman | 599d0c9 | 2016-07-28 15:45:31 -0700 | [diff] [blame] | 2093 | lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2094 | VM_BUG_ON_PAGE(PageLRU(page), page); |
| 2095 | SetPageLRU(page); |
| 2096 | add_page_to_lru_list(page, lruvec, page_lru(page)); |
| 2097 | } |
Mel Gorman | a52633d | 2016-07-28 15:45:28 -0700 | [diff] [blame] | 2098 | spin_unlock_irq(zone_lru_lock(zone)); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2099 | } |
| 2100 | |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 2101 | static void commit_charge(struct page *page, struct mem_cgroup *memcg, |
Johannes Weiner | 6abb5a8 | 2014-08-08 14:19:33 -0700 | [diff] [blame] | 2102 | bool lrucare) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 2103 | { |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2104 | int isolated; |
Hugh Dickins | 9ce70c0 | 2012-03-05 14:59:16 -0800 | [diff] [blame] | 2105 | |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 2106 | VM_BUG_ON_PAGE(page->mem_cgroup, page); |
Hugh Dickins | 9ce70c0 | 2012-03-05 14:59:16 -0800 | [diff] [blame] | 2107 | |
| 2108 | /* |
| 2109 | * In some cases, SwapCache and FUSE(splice_buf->radixtree), the page |
| 2110 | * may already be on some other mem_cgroup's LRU. Take care of it. |
| 2111 | */ |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2112 | if (lrucare) |
| 2113 | lock_page_lru(page, &isolated); |
Hugh Dickins | 9ce70c0 | 2012-03-05 14:59:16 -0800 | [diff] [blame] | 2114 | |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2115 | /* |
| 2116 | * Nobody should be changing or seriously looking at |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 2117 | * page->mem_cgroup at this point: |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2118 | * |
| 2119 | * - the page is uncharged |
| 2120 | * |
| 2121 | * - the page is off-LRU |
| 2122 | * |
| 2123 | * - an anonymous fault has exclusive page access, except for |
| 2124 | * a locked page table |
| 2125 | * |
| 2126 | * - a page cache insertion, a swapin fault, or a migration |
| 2127 | * have the page locked |
| 2128 | */ |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 2129 | page->mem_cgroup = memcg; |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 2130 | |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2131 | if (lrucare) |
| 2132 | unlock_page_lru(page, isolated); |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 2133 | } |
| 2134 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 2135 | #ifndef CONFIG_SLOB |
Vladimir Davydov | f3bb304 | 2014-10-09 15:28:45 -0700 | [diff] [blame] | 2136 | static int memcg_alloc_cache_id(void) |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 2137 | { |
Vladimir Davydov | f3bb304 | 2014-10-09 15:28:45 -0700 | [diff] [blame] | 2138 | int id, size; |
| 2139 | int err; |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 2140 | |
Vladimir Davydov | dbcf73e | 2015-02-12 14:58:57 -0800 | [diff] [blame] | 2141 | id = ida_simple_get(&memcg_cache_ida, |
Vladimir Davydov | f3bb304 | 2014-10-09 15:28:45 -0700 | [diff] [blame] | 2142 | 0, MEMCG_CACHES_MAX_SIZE, GFP_KERNEL); |
| 2143 | if (id < 0) |
| 2144 | return id; |
| 2145 | |
Vladimir Davydov | dbcf73e | 2015-02-12 14:58:57 -0800 | [diff] [blame] | 2146 | if (id < memcg_nr_cache_ids) |
Vladimir Davydov | f3bb304 | 2014-10-09 15:28:45 -0700 | [diff] [blame] | 2147 | return id; |
| 2148 | |
| 2149 | /* |
| 2150 | * There's no space for the new id in memcg_caches arrays, |
| 2151 | * so we have to grow them. |
| 2152 | */ |
Vladimir Davydov | 05257a1 | 2015-02-12 14:59:01 -0800 | [diff] [blame] | 2153 | down_write(&memcg_cache_ids_sem); |
Vladimir Davydov | f3bb304 | 2014-10-09 15:28:45 -0700 | [diff] [blame] | 2154 | |
| 2155 | size = 2 * (id + 1); |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 2156 | if (size < MEMCG_CACHES_MIN_SIZE) |
| 2157 | size = MEMCG_CACHES_MIN_SIZE; |
| 2158 | else if (size > MEMCG_CACHES_MAX_SIZE) |
| 2159 | size = MEMCG_CACHES_MAX_SIZE; |
| 2160 | |
Vladimir Davydov | f3bb304 | 2014-10-09 15:28:45 -0700 | [diff] [blame] | 2161 | err = memcg_update_all_caches(size); |
Vladimir Davydov | 05257a1 | 2015-02-12 14:59:01 -0800 | [diff] [blame] | 2162 | if (!err) |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 2163 | err = memcg_update_all_list_lrus(size); |
| 2164 | if (!err) |
Vladimir Davydov | 05257a1 | 2015-02-12 14:59:01 -0800 | [diff] [blame] | 2165 | memcg_nr_cache_ids = size; |
| 2166 | |
| 2167 | up_write(&memcg_cache_ids_sem); |
| 2168 | |
Vladimir Davydov | f3bb304 | 2014-10-09 15:28:45 -0700 | [diff] [blame] | 2169 | if (err) { |
Vladimir Davydov | dbcf73e | 2015-02-12 14:58:57 -0800 | [diff] [blame] | 2170 | ida_simple_remove(&memcg_cache_ida, id); |
Vladimir Davydov | f3bb304 | 2014-10-09 15:28:45 -0700 | [diff] [blame] | 2171 | return err; |
| 2172 | } |
| 2173 | return id; |
| 2174 | } |
| 2175 | |
| 2176 | static void memcg_free_cache_id(int id) |
| 2177 | { |
Vladimir Davydov | dbcf73e | 2015-02-12 14:58:57 -0800 | [diff] [blame] | 2178 | ida_simple_remove(&memcg_cache_ida, id); |
Glauber Costa | 55007d8 | 2012-12-18 14:22:38 -0800 | [diff] [blame] | 2179 | } |
| 2180 | |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2181 | struct memcg_kmem_cache_create_work { |
Vladimir Davydov | 5722d09 | 2014-04-07 15:39:24 -0700 | [diff] [blame] | 2182 | struct mem_cgroup *memcg; |
| 2183 | struct kmem_cache *cachep; |
| 2184 | struct work_struct work; |
| 2185 | }; |
| 2186 | |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2187 | static void memcg_kmem_cache_create_func(struct work_struct *w) |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2188 | { |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2189 | struct memcg_kmem_cache_create_work *cw = |
| 2190 | container_of(w, struct memcg_kmem_cache_create_work, work); |
Vladimir Davydov | 5722d09 | 2014-04-07 15:39:24 -0700 | [diff] [blame] | 2191 | struct mem_cgroup *memcg = cw->memcg; |
| 2192 | struct kmem_cache *cachep = cw->cachep; |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2193 | |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2194 | memcg_create_kmem_cache(memcg, cachep); |
Vladimir Davydov | bd67314 | 2014-06-04 16:07:40 -0700 | [diff] [blame] | 2195 | |
Vladimir Davydov | 5722d09 | 2014-04-07 15:39:24 -0700 | [diff] [blame] | 2196 | css_put(&memcg->css); |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2197 | kfree(cw); |
| 2198 | } |
| 2199 | |
| 2200 | /* |
| 2201 | * Enqueue the creation of a per-memcg kmem_cache. |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2202 | */ |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2203 | static void __memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg, |
| 2204 | struct kmem_cache *cachep) |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2205 | { |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2206 | struct memcg_kmem_cache_create_work *cw; |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2207 | |
Vladimir Davydov | 776ed0f | 2014-06-04 16:10:02 -0700 | [diff] [blame] | 2208 | cw = kmalloc(sizeof(*cw), GFP_NOWAIT); |
Vladimir Davydov | 8135be5 | 2014-12-12 16:56:38 -0800 | [diff] [blame] | 2209 | if (!cw) |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2210 | return; |
Vladimir Davydov | 8135be5 | 2014-12-12 16:56:38 -0800 | [diff] [blame] | 2211 | |
| 2212 | css_get(&memcg->css); |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2213 | |
| 2214 | cw->memcg = memcg; |
| 2215 | cw->cachep = cachep; |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2216 | INIT_WORK(&cw->work, memcg_kmem_cache_create_func); |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2217 | |
Tejun Heo | 17cc4df | 2017-02-22 15:41:36 -0800 | [diff] [blame] | 2218 | queue_work(memcg_kmem_cache_wq, &cw->work); |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2219 | } |
| 2220 | |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2221 | static void memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg, |
| 2222 | struct kmem_cache *cachep) |
Glauber Costa | 0e9d92f | 2012-12-18 14:22:42 -0800 | [diff] [blame] | 2223 | { |
| 2224 | /* |
| 2225 | * We need to stop accounting when we kmalloc, because if the |
| 2226 | * corresponding kmalloc cache is not yet created, the first allocation |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2227 | * in __memcg_schedule_kmem_cache_create will recurse. |
Glauber Costa | 0e9d92f | 2012-12-18 14:22:42 -0800 | [diff] [blame] | 2228 | * |
| 2229 | * However, it is better to enclose the whole function. Depending on |
| 2230 | * the debugging options enabled, INIT_WORK(), for instance, can |
| 2231 | * trigger an allocation. This too, will make us recurse. Because at |
| 2232 | * this point we can't allow ourselves back into memcg_kmem_get_cache, |
| 2233 | * the safest choice is to do it like this, wrapping the whole function. |
| 2234 | */ |
Vladimir Davydov | 6f185c2 | 2014-12-12 16:55:15 -0800 | [diff] [blame] | 2235 | current->memcg_kmem_skip_account = 1; |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2236 | __memcg_schedule_kmem_cache_create(memcg, cachep); |
Vladimir Davydov | 6f185c2 | 2014-12-12 16:55:15 -0800 | [diff] [blame] | 2237 | current->memcg_kmem_skip_account = 0; |
Glauber Costa | 0e9d92f | 2012-12-18 14:22:42 -0800 | [diff] [blame] | 2238 | } |
Vladimir Davydov | c67a8a6 | 2014-06-04 16:07:39 -0700 | [diff] [blame] | 2239 | |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2240 | static inline bool memcg_kmem_bypass(void) |
| 2241 | { |
| 2242 | if (in_interrupt() || !current->mm || (current->flags & PF_KTHREAD)) |
| 2243 | return true; |
| 2244 | return false; |
| 2245 | } |
| 2246 | |
| 2247 | /** |
| 2248 | * memcg_kmem_get_cache: select the correct per-memcg cache for allocation |
| 2249 | * @cachep: the original global kmem cache |
| 2250 | * |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2251 | * Return the kmem_cache we're supposed to use for a slab allocation. |
| 2252 | * We try to use the current memcg's version of the cache. |
| 2253 | * |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2254 | * If the cache does not exist yet, if we are the first user of it, we |
| 2255 | * create it asynchronously in a workqueue and let the current allocation |
| 2256 | * go through with the original cache. |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2257 | * |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2258 | * This function takes a reference to the cache it returns to assure it |
| 2259 | * won't get destroyed while we are working with it. Once the caller is |
| 2260 | * done with it, memcg_kmem_put_cache() must be called to release the |
| 2261 | * reference. |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2262 | */ |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2263 | struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep) |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2264 | { |
| 2265 | struct mem_cgroup *memcg; |
Vladimir Davydov | 959c896 | 2014-01-23 15:52:59 -0800 | [diff] [blame] | 2266 | struct kmem_cache *memcg_cachep; |
Vladimir Davydov | 2a4db7e | 2015-02-12 14:59:32 -0800 | [diff] [blame] | 2267 | int kmemcg_id; |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2268 | |
Vladimir Davydov | f7ce319 | 2015-02-12 14:59:20 -0800 | [diff] [blame] | 2269 | VM_BUG_ON(!is_root_cache(cachep)); |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2270 | |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2271 | if (memcg_kmem_bypass()) |
Vladimir Davydov | 230e9fc | 2016-01-14 15:18:15 -0800 | [diff] [blame] | 2272 | return cachep; |
| 2273 | |
Vladimir Davydov | 9d100c5 | 2014-12-12 16:54:53 -0800 | [diff] [blame] | 2274 | if (current->memcg_kmem_skip_account) |
Glauber Costa | 0e9d92f | 2012-12-18 14:22:42 -0800 | [diff] [blame] | 2275 | return cachep; |
| 2276 | |
Vladimir Davydov | 8135be5 | 2014-12-12 16:56:38 -0800 | [diff] [blame] | 2277 | memcg = get_mem_cgroup_from_mm(current->mm); |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 2278 | kmemcg_id = READ_ONCE(memcg->kmemcg_id); |
Vladimir Davydov | 2a4db7e | 2015-02-12 14:59:32 -0800 | [diff] [blame] | 2279 | if (kmemcg_id < 0) |
Li Zefan | ca0dde9 | 2013-04-29 15:08:57 -0700 | [diff] [blame] | 2280 | goto out; |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2281 | |
Vladimir Davydov | 2a4db7e | 2015-02-12 14:59:32 -0800 | [diff] [blame] | 2282 | memcg_cachep = cache_from_memcg_idx(cachep, kmemcg_id); |
Vladimir Davydov | 8135be5 | 2014-12-12 16:56:38 -0800 | [diff] [blame] | 2283 | if (likely(memcg_cachep)) |
| 2284 | return memcg_cachep; |
Li Zefan | ca0dde9 | 2013-04-29 15:08:57 -0700 | [diff] [blame] | 2285 | |
| 2286 | /* |
| 2287 | * If we are in a safe context (can wait, and not in interrupt |
| 2288 | * context), we could be be predictable and return right away. |
| 2289 | * This would guarantee that the allocation being performed |
| 2290 | * already belongs in the new cache. |
| 2291 | * |
| 2292 | * However, there are some clashes that can arrive from locking. |
| 2293 | * For instance, because we acquire the slab_mutex while doing |
Vladimir Davydov | 776ed0f | 2014-06-04 16:10:02 -0700 | [diff] [blame] | 2294 | * memcg_create_kmem_cache, this means no further allocation |
| 2295 | * could happen with the slab_mutex held. So it's better to |
| 2296 | * defer everything. |
Li Zefan | ca0dde9 | 2013-04-29 15:08:57 -0700 | [diff] [blame] | 2297 | */ |
Vladimir Davydov | d5b3cf7 | 2015-02-10 14:11:47 -0800 | [diff] [blame] | 2298 | memcg_schedule_kmem_cache_create(memcg, cachep); |
Li Zefan | ca0dde9 | 2013-04-29 15:08:57 -0700 | [diff] [blame] | 2299 | out: |
Vladimir Davydov | 8135be5 | 2014-12-12 16:56:38 -0800 | [diff] [blame] | 2300 | css_put(&memcg->css); |
Li Zefan | ca0dde9 | 2013-04-29 15:08:57 -0700 | [diff] [blame] | 2301 | return cachep; |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2302 | } |
Glauber Costa | d7f25f8 | 2012-12-18 14:22:40 -0800 | [diff] [blame] | 2303 | |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2304 | /** |
| 2305 | * memcg_kmem_put_cache: drop reference taken by memcg_kmem_get_cache |
| 2306 | * @cachep: the cache returned by memcg_kmem_get_cache |
| 2307 | */ |
| 2308 | void memcg_kmem_put_cache(struct kmem_cache *cachep) |
Vladimir Davydov | 8135be5 | 2014-12-12 16:56:38 -0800 | [diff] [blame] | 2309 | { |
| 2310 | if (!is_root_cache(cachep)) |
Vladimir Davydov | f7ce319 | 2015-02-12 14:59:20 -0800 | [diff] [blame] | 2311 | css_put(&cachep->memcg_params.memcg->css); |
Vladimir Davydov | 8135be5 | 2014-12-12 16:56:38 -0800 | [diff] [blame] | 2312 | } |
| 2313 | |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2314 | /** |
| 2315 | * memcg_kmem_charge: charge a kmem page |
| 2316 | * @page: page to charge |
| 2317 | * @gfp: reclaim mode |
| 2318 | * @order: allocation order |
| 2319 | * @memcg: memory cgroup to charge |
| 2320 | * |
| 2321 | * Returns 0 on success, an error code on failure. |
| 2322 | */ |
| 2323 | int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order, |
| 2324 | struct mem_cgroup *memcg) |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 2325 | { |
| 2326 | unsigned int nr_pages = 1 << order; |
| 2327 | struct page_counter *counter; |
Johannes Weiner | 6071ca5 | 2015-11-05 18:50:26 -0800 | [diff] [blame] | 2328 | int ret; |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 2329 | |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 2330 | ret = try_charge(memcg, gfp, nr_pages); |
Johannes Weiner | 52c29b0 | 2016-01-20 15:02:35 -0800 | [diff] [blame] | 2331 | if (ret) |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 2332 | return ret; |
Johannes Weiner | 52c29b0 | 2016-01-20 15:02:35 -0800 | [diff] [blame] | 2333 | |
| 2334 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && |
| 2335 | !page_counter_try_charge(&memcg->kmem, nr_pages, &counter)) { |
| 2336 | cancel_charge(memcg, nr_pages); |
| 2337 | return -ENOMEM; |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 2338 | } |
| 2339 | |
| 2340 | page->mem_cgroup = memcg; |
| 2341 | |
| 2342 | return 0; |
| 2343 | } |
| 2344 | |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2345 | /** |
| 2346 | * memcg_kmem_charge: charge a kmem page to the current memory cgroup |
| 2347 | * @page: page to charge |
| 2348 | * @gfp: reclaim mode |
| 2349 | * @order: allocation order |
| 2350 | * |
| 2351 | * Returns 0 on success, an error code on failure. |
| 2352 | */ |
| 2353 | int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) |
Glauber Costa | 7ae1e1d | 2012-12-18 14:21:56 -0800 | [diff] [blame] | 2354 | { |
| 2355 | struct mem_cgroup *memcg; |
Vladimir Davydov | fcff7d7 | 2016-03-17 14:17:29 -0700 | [diff] [blame] | 2356 | int ret = 0; |
Glauber Costa | 7ae1e1d | 2012-12-18 14:21:56 -0800 | [diff] [blame] | 2357 | |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2358 | if (memcg_kmem_bypass()) |
| 2359 | return 0; |
| 2360 | |
Johannes Weiner | df38197 | 2014-04-07 15:37:43 -0700 | [diff] [blame] | 2361 | memcg = get_mem_cgroup_from_mm(current->mm); |
Vladimir Davydov | c4159a7 | 2016-08-08 23:03:12 +0300 | [diff] [blame] | 2362 | if (!mem_cgroup_is_root(memcg)) { |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2363 | ret = memcg_kmem_charge_memcg(page, gfp, order, memcg); |
Vladimir Davydov | c4159a7 | 2016-08-08 23:03:12 +0300 | [diff] [blame] | 2364 | if (!ret) |
| 2365 | __SetPageKmemcg(page); |
| 2366 | } |
Glauber Costa | 7ae1e1d | 2012-12-18 14:21:56 -0800 | [diff] [blame] | 2367 | css_put(&memcg->css); |
Vladimir Davydov | d05e83a | 2015-11-05 18:48:59 -0800 | [diff] [blame] | 2368 | return ret; |
Glauber Costa | 7ae1e1d | 2012-12-18 14:21:56 -0800 | [diff] [blame] | 2369 | } |
Vladimir Davydov | 4526477 | 2016-07-26 15:24:21 -0700 | [diff] [blame] | 2370 | /** |
| 2371 | * memcg_kmem_uncharge: uncharge a kmem page |
| 2372 | * @page: page to uncharge |
| 2373 | * @order: allocation order |
| 2374 | */ |
| 2375 | void memcg_kmem_uncharge(struct page *page, int order) |
Glauber Costa | 7ae1e1d | 2012-12-18 14:21:56 -0800 | [diff] [blame] | 2376 | { |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 2377 | struct mem_cgroup *memcg = page->mem_cgroup; |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 2378 | unsigned int nr_pages = 1 << order; |
Glauber Costa | 7ae1e1d | 2012-12-18 14:21:56 -0800 | [diff] [blame] | 2379 | |
Glauber Costa | 7ae1e1d | 2012-12-18 14:21:56 -0800 | [diff] [blame] | 2380 | if (!memcg) |
| 2381 | return; |
| 2382 | |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 2383 | VM_BUG_ON_PAGE(mem_cgroup_is_root(memcg), page); |
Johannes Weiner | 2983331 | 2014-12-10 15:44:02 -0800 | [diff] [blame] | 2384 | |
Johannes Weiner | 52c29b0 | 2016-01-20 15:02:35 -0800 | [diff] [blame] | 2385 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
| 2386 | page_counter_uncharge(&memcg->kmem, nr_pages); |
| 2387 | |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 2388 | page_counter_uncharge(&memcg->memory, nr_pages); |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 2389 | if (do_memsw_account()) |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 2390 | page_counter_uncharge(&memcg->memsw, nr_pages); |
| 2391 | |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 2392 | page->mem_cgroup = NULL; |
Vladimir Davydov | c4159a7 | 2016-08-08 23:03:12 +0300 | [diff] [blame] | 2393 | |
| 2394 | /* slab pages do not have PageKmemcg flag set */ |
| 2395 | if (PageKmemcg(page)) |
| 2396 | __ClearPageKmemcg(page); |
| 2397 | |
Vladimir Davydov | f3ccb2c4 | 2015-11-05 18:49:01 -0800 | [diff] [blame] | 2398 | css_put_many(&memcg->css, nr_pages); |
Vladimir Davydov | 60d3fd3 | 2015-02-12 14:59:10 -0800 | [diff] [blame] | 2399 | } |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 2400 | #endif /* !CONFIG_SLOB */ |
Glauber Costa | 7ae1e1d | 2012-12-18 14:21:56 -0800 | [diff] [blame] | 2401 | |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2402 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 2403 | |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2404 | /* |
| 2405 | * Because tail pages are not marked as "used", set it. We're under |
Mel Gorman | a52633d | 2016-07-28 15:45:28 -0700 | [diff] [blame] | 2406 | * zone_lru_lock and migration entries setup in all page mappings. |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2407 | */ |
KAMEZAWA Hiroyuki | e94c8a9 | 2012-01-12 17:18:20 -0800 | [diff] [blame] | 2408 | void mem_cgroup_split_huge_fixup(struct page *head) |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2409 | { |
KAMEZAWA Hiroyuki | e94c8a9 | 2012-01-12 17:18:20 -0800 | [diff] [blame] | 2410 | int i; |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2411 | |
KAMEZAWA Hiroyuki | 3d37c4a | 2011-01-25 15:07:28 -0800 | [diff] [blame] | 2412 | if (mem_cgroup_disabled()) |
| 2413 | return; |
David Rientjes | b070e65 | 2013-05-07 16:18:09 -0700 | [diff] [blame] | 2414 | |
Johannes Weiner | 2983331 | 2014-12-10 15:44:02 -0800 | [diff] [blame] | 2415 | for (i = 1; i < HPAGE_PMD_NR; i++) |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 2416 | head[i].mem_cgroup = head->mem_cgroup; |
Michal Hocko | b9982f8 | 2014-12-10 15:43:51 -0800 | [diff] [blame] | 2417 | |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 2418 | __this_cpu_sub(head->mem_cgroup->stat->count[MEMCG_RSS_HUGE], |
David Rientjes | b070e65 | 2013-05-07 16:18:09 -0700 | [diff] [blame] | 2419 | HPAGE_PMD_NR); |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2420 | } |
Hugh Dickins | 12d2710 | 2012-01-12 17:19:52 -0800 | [diff] [blame] | 2421 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
KAMEZAWA Hiroyuki | ca3e021 | 2011-01-20 14:44:24 -0800 | [diff] [blame] | 2422 | |
Andrew Morton | c255a45 | 2012-07-31 16:43:02 -0700 | [diff] [blame] | 2423 | #ifdef CONFIG_MEMCG_SWAP |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2424 | static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg, |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 2425 | int nr_entries) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2426 | { |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 2427 | this_cpu_add(memcg->stat->count[MEMCG_SWAP], nr_entries); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2428 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2429 | |
| 2430 | /** |
| 2431 | * mem_cgroup_move_swap_account - move swap charge and swap_cgroup's record. |
| 2432 | * @entry: swap entry to be moved |
| 2433 | * @from: mem_cgroup which the entry is moved from |
| 2434 | * @to: mem_cgroup which the entry is moved to |
| 2435 | * |
| 2436 | * It succeeds only when the swap_cgroup's record for this entry is the same |
| 2437 | * as the mem_cgroup's id of @from. |
| 2438 | * |
| 2439 | * Returns 0 on success, -EINVAL on failure. |
| 2440 | * |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2441 | * The caller must have charged to @to, IOW, called page_counter_charge() about |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2442 | * both res and memsw, and called css_get(). |
| 2443 | */ |
| 2444 | static int mem_cgroup_move_swap_account(swp_entry_t entry, |
Hugh Dickins | e91cbb4 | 2012-05-29 15:06:51 -0700 | [diff] [blame] | 2445 | struct mem_cgroup *from, struct mem_cgroup *to) |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2446 | { |
| 2447 | unsigned short old_id, new_id; |
| 2448 | |
Li Zefan | 34c00c3 | 2013-09-23 16:56:01 +0800 | [diff] [blame] | 2449 | old_id = mem_cgroup_id(from); |
| 2450 | new_id = mem_cgroup_id(to); |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2451 | |
| 2452 | if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) { |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 2453 | mem_cgroup_swap_statistics(from, -1); |
| 2454 | mem_cgroup_swap_statistics(to, 1); |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2455 | return 0; |
| 2456 | } |
| 2457 | return -EINVAL; |
| 2458 | } |
| 2459 | #else |
| 2460 | static inline int mem_cgroup_move_swap_account(swp_entry_t entry, |
Hugh Dickins | e91cbb4 | 2012-05-29 15:06:51 -0700 | [diff] [blame] | 2461 | struct mem_cgroup *from, struct mem_cgroup *to) |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 2462 | { |
| 2463 | return -EINVAL; |
| 2464 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2465 | #endif |
| 2466 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2467 | static DEFINE_MUTEX(memcg_limit_mutex); |
Daisuke Nishimura | f212ad7 | 2011-03-23 16:42:25 -0700 | [diff] [blame] | 2468 | |
KOSAKI Motohiro | d38d2a7 | 2009-01-06 14:39:44 -0800 | [diff] [blame] | 2469 | static int mem_cgroup_resize_limit(struct mem_cgroup *memcg, |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2470 | unsigned long limit) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2471 | { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2472 | unsigned long curusage; |
| 2473 | unsigned long oldusage; |
| 2474 | bool enlarge = false; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2475 | int retry_count; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2476 | int ret; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2477 | |
| 2478 | /* |
| 2479 | * For keeping hierarchical_reclaim simple, how long we should retry |
| 2480 | * is depends on callers. We set our retry-count to be function |
| 2481 | * of # of children which we should visit in this loop. |
| 2482 | */ |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2483 | retry_count = MEM_CGROUP_RECLAIM_RETRIES * |
| 2484 | mem_cgroup_count_children(memcg); |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2485 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2486 | oldusage = page_counter_read(&memcg->memory); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2487 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2488 | do { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2489 | if (signal_pending(current)) { |
| 2490 | ret = -EINTR; |
| 2491 | break; |
| 2492 | } |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2493 | |
| 2494 | mutex_lock(&memcg_limit_mutex); |
| 2495 | if (limit > memcg->memsw.limit) { |
| 2496 | mutex_unlock(&memcg_limit_mutex); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2497 | ret = -EINVAL; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2498 | break; |
| 2499 | } |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2500 | if (limit > memcg->memory.limit) |
| 2501 | enlarge = true; |
| 2502 | ret = page_counter_limit(&memcg->memory, limit); |
| 2503 | mutex_unlock(&memcg_limit_mutex); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2504 | |
| 2505 | if (!ret) |
| 2506 | break; |
| 2507 | |
Johannes Weiner | b70a2a2 | 2014-10-09 15:28:56 -0700 | [diff] [blame] | 2508 | try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL, true); |
| 2509 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2510 | curusage = page_counter_read(&memcg->memory); |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2511 | /* Usage is reduced ? */ |
Andrew Morton | f894ffa | 2013-09-12 15:13:35 -0700 | [diff] [blame] | 2512 | if (curusage >= oldusage) |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2513 | retry_count--; |
| 2514 | else |
| 2515 | oldusage = curusage; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2516 | } while (retry_count); |
| 2517 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2518 | if (!ret && enlarge) |
| 2519 | memcg_oom_recover(memcg); |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 2520 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2521 | return ret; |
| 2522 | } |
| 2523 | |
Li Zefan | 338c843 | 2009-06-17 16:27:15 -0700 | [diff] [blame] | 2524 | static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg, |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2525 | unsigned long limit) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2526 | { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2527 | unsigned long curusage; |
| 2528 | unsigned long oldusage; |
| 2529 | bool enlarge = false; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2530 | int retry_count; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2531 | int ret; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2532 | |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2533 | /* see mem_cgroup_resize_res_limit */ |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2534 | retry_count = MEM_CGROUP_RECLAIM_RETRIES * |
| 2535 | mem_cgroup_count_children(memcg); |
| 2536 | |
| 2537 | oldusage = page_counter_read(&memcg->memsw); |
| 2538 | |
| 2539 | do { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2540 | if (signal_pending(current)) { |
| 2541 | ret = -EINTR; |
| 2542 | break; |
| 2543 | } |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2544 | |
| 2545 | mutex_lock(&memcg_limit_mutex); |
| 2546 | if (limit < memcg->memory.limit) { |
| 2547 | mutex_unlock(&memcg_limit_mutex); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2548 | ret = -EINVAL; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2549 | break; |
| 2550 | } |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2551 | if (limit > memcg->memsw.limit) |
| 2552 | enlarge = true; |
| 2553 | ret = page_counter_limit(&memcg->memsw, limit); |
| 2554 | mutex_unlock(&memcg_limit_mutex); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2555 | |
| 2556 | if (!ret) |
| 2557 | break; |
| 2558 | |
Johannes Weiner | b70a2a2 | 2014-10-09 15:28:56 -0700 | [diff] [blame] | 2559 | try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL, false); |
| 2560 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2561 | curusage = page_counter_read(&memcg->memsw); |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2562 | /* Usage is reduced ? */ |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2563 | if (curusage >= oldusage) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2564 | retry_count--; |
KAMEZAWA Hiroyuki | 81d39c2 | 2009-04-02 16:57:36 -0700 | [diff] [blame] | 2565 | else |
| 2566 | oldusage = curusage; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2567 | } while (retry_count); |
| 2568 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 2569 | if (!ret && enlarge) |
| 2570 | memcg_oom_recover(memcg); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2571 | |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2572 | return ret; |
| 2573 | } |
| 2574 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 2575 | unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 2576 | gfp_t gfp_mask, |
| 2577 | unsigned long *total_scanned) |
| 2578 | { |
| 2579 | unsigned long nr_reclaimed = 0; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 2580 | struct mem_cgroup_per_node *mz, *next_mz = NULL; |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 2581 | unsigned long reclaimed; |
| 2582 | int loop = 0; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 2583 | struct mem_cgroup_tree_per_node *mctz; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2584 | unsigned long excess; |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 2585 | unsigned long nr_scanned; |
| 2586 | |
| 2587 | if (order > 0) |
| 2588 | return 0; |
| 2589 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 2590 | mctz = soft_limit_tree_node(pgdat->node_id); |
Michal Hocko | d6507ff | 2016-08-02 14:02:37 -0700 | [diff] [blame] | 2591 | |
| 2592 | /* |
| 2593 | * Do not even bother to check the largest node if the root |
| 2594 | * is empty. Do it lockless to prevent lock bouncing. Races |
| 2595 | * are acceptable as soft limit is best effort anyway. |
| 2596 | */ |
Laurent Dufour | bfc7228 | 2017-03-09 16:17:06 -0800 | [diff] [blame] | 2597 | if (!mctz || RB_EMPTY_ROOT(&mctz->rb_root)) |
Michal Hocko | d6507ff | 2016-08-02 14:02:37 -0700 | [diff] [blame] | 2598 | return 0; |
| 2599 | |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 2600 | /* |
| 2601 | * This loop can run a while, specially if mem_cgroup's continuously |
| 2602 | * keep exceeding their soft limit and putting the system under |
| 2603 | * pressure |
| 2604 | */ |
| 2605 | do { |
| 2606 | if (next_mz) |
| 2607 | mz = next_mz; |
| 2608 | else |
| 2609 | mz = mem_cgroup_largest_soft_limit_node(mctz); |
| 2610 | if (!mz) |
| 2611 | break; |
| 2612 | |
| 2613 | nr_scanned = 0; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 2614 | reclaimed = mem_cgroup_soft_reclaim(mz->memcg, pgdat, |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 2615 | gfp_mask, &nr_scanned); |
| 2616 | nr_reclaimed += reclaimed; |
| 2617 | *total_scanned += nr_scanned; |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2618 | spin_lock_irq(&mctz->lock); |
Vladimir Davydov | bc2f2e7 | 2014-12-10 15:43:40 -0800 | [diff] [blame] | 2619 | __mem_cgroup_remove_exceeded(mz, mctz); |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 2620 | |
| 2621 | /* |
| 2622 | * If we failed to reclaim anything from this memory cgroup |
| 2623 | * it is time to move on to the next cgroup |
| 2624 | */ |
| 2625 | next_mz = NULL; |
Vladimir Davydov | bc2f2e7 | 2014-12-10 15:43:40 -0800 | [diff] [blame] | 2626 | if (!reclaimed) |
| 2627 | next_mz = __mem_cgroup_largest_soft_limit_node(mctz); |
| 2628 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2629 | excess = soft_limit_excess(mz->memcg); |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 2630 | /* |
| 2631 | * One school of thought says that we should not add |
| 2632 | * back the node to the tree if reclaim returns 0. |
| 2633 | * But our reclaim could return 0, simply because due |
| 2634 | * to priority we are exposing a smaller subset of |
| 2635 | * memory to reclaim from. Consider this as a longer |
| 2636 | * term TODO. |
| 2637 | */ |
| 2638 | /* If excess == 0, no tree ops */ |
Johannes Weiner | cf2c812 | 2014-06-06 14:38:21 -0700 | [diff] [blame] | 2639 | __mem_cgroup_insert_exceeded(mz, mctz, excess); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 2640 | spin_unlock_irq(&mctz->lock); |
Andrew Morton | 0608f43 | 2013-09-24 15:27:41 -0700 | [diff] [blame] | 2641 | css_put(&mz->memcg->css); |
| 2642 | loop++; |
| 2643 | /* |
| 2644 | * Could not reclaim anything and there are no more |
| 2645 | * mem cgroups to try or we seem to be looping without |
| 2646 | * reclaiming anything. |
| 2647 | */ |
| 2648 | if (!nr_reclaimed && |
| 2649 | (next_mz == NULL || |
| 2650 | loop > MEM_CGROUP_MAX_SOFT_LIMIT_RECLAIM_LOOPS)) |
| 2651 | break; |
| 2652 | } while (!nr_reclaimed); |
| 2653 | if (next_mz) |
| 2654 | css_put(&next_mz->memcg->css); |
| 2655 | return nr_reclaimed; |
| 2656 | } |
| 2657 | |
Tejun Heo | ea280e7 | 2014-05-16 13:22:48 -0400 | [diff] [blame] | 2658 | /* |
| 2659 | * Test whether @memcg has children, dead or alive. Note that this |
| 2660 | * function doesn't care whether @memcg has use_hierarchy enabled and |
| 2661 | * returns %true if there are child csses according to the cgroup |
| 2662 | * hierarchy. Testing use_hierarchy is the caller's responsiblity. |
| 2663 | */ |
Glauber Costa | b5f99b5 | 2013-02-22 16:34:53 -0800 | [diff] [blame] | 2664 | static inline bool memcg_has_children(struct mem_cgroup *memcg) |
| 2665 | { |
Tejun Heo | ea280e7 | 2014-05-16 13:22:48 -0400 | [diff] [blame] | 2666 | bool ret; |
| 2667 | |
Tejun Heo | ea280e7 | 2014-05-16 13:22:48 -0400 | [diff] [blame] | 2668 | rcu_read_lock(); |
| 2669 | ret = css_next_child(NULL, &memcg->css); |
| 2670 | rcu_read_unlock(); |
| 2671 | return ret; |
Glauber Costa | b5f99b5 | 2013-02-22 16:34:53 -0800 | [diff] [blame] | 2672 | } |
| 2673 | |
| 2674 | /* |
Greg Thelen | 5103817 | 2016-05-20 16:58:18 -0700 | [diff] [blame] | 2675 | * Reclaims as many pages from the given memcg as possible. |
Michal Hocko | c26251f | 2012-10-26 13:37:28 +0200 | [diff] [blame] | 2676 | * |
| 2677 | * Caller is responsible for holding css reference for memcg. |
| 2678 | */ |
| 2679 | static int mem_cgroup_force_empty(struct mem_cgroup *memcg) |
| 2680 | { |
| 2681 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
Michal Hocko | c26251f | 2012-10-26 13:37:28 +0200 | [diff] [blame] | 2682 | |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2683 | /* we call try-to-free pages for make this cgroup empty */ |
| 2684 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2685 | /* try to free all pages in this cgroup */ |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2686 | while (nr_retries && page_counter_read(&memcg->memory)) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2687 | int progress; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2688 | |
Michal Hocko | c26251f | 2012-10-26 13:37:28 +0200 | [diff] [blame] | 2689 | if (signal_pending(current)) |
| 2690 | return -EINTR; |
| 2691 | |
Johannes Weiner | b70a2a2 | 2014-10-09 15:28:56 -0700 | [diff] [blame] | 2692 | progress = try_to_free_mem_cgroup_pages(memcg, 1, |
| 2693 | GFP_KERNEL, true); |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2694 | if (!progress) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2695 | nr_retries--; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2696 | /* maybe some writeback is necessary */ |
Jens Axboe | 8aa7e84 | 2009-07-09 14:52:32 +0200 | [diff] [blame] | 2697 | congestion_wait(BLK_RW_ASYNC, HZ/10); |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2698 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2699 | |
| 2700 | } |
Michal Hocko | ab5196c | 2012-10-26 13:37:32 +0200 | [diff] [blame] | 2701 | |
| 2702 | return 0; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 2703 | } |
| 2704 | |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 2705 | static ssize_t mem_cgroup_force_empty_write(struct kernfs_open_file *of, |
| 2706 | char *buf, size_t nbytes, |
| 2707 | loff_t off) |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2708 | { |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 2709 | struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); |
Michal Hocko | c26251f | 2012-10-26 13:37:28 +0200 | [diff] [blame] | 2710 | |
Michal Hocko | d842301 | 2012-10-26 13:37:29 +0200 | [diff] [blame] | 2711 | if (mem_cgroup_is_root(memcg)) |
| 2712 | return -EINVAL; |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 2713 | return mem_cgroup_force_empty(memcg) ?: nbytes; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2714 | } |
| 2715 | |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 2716 | static u64 mem_cgroup_hierarchy_read(struct cgroup_subsys_state *css, |
| 2717 | struct cftype *cft) |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2718 | { |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 2719 | return mem_cgroup_from_css(css)->use_hierarchy; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2720 | } |
| 2721 | |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 2722 | static int mem_cgroup_hierarchy_write(struct cgroup_subsys_state *css, |
| 2723 | struct cftype *cft, u64 val) |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2724 | { |
| 2725 | int retval = 0; |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 2726 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
Tejun Heo | 5c9d535 | 2014-05-16 13:22:48 -0400 | [diff] [blame] | 2727 | struct mem_cgroup *parent_memcg = mem_cgroup_from_css(memcg->css.parent); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2728 | |
Glauber Costa | 567fb43 | 2012-07-31 16:43:07 -0700 | [diff] [blame] | 2729 | if (memcg->use_hierarchy == val) |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 2730 | return 0; |
Glauber Costa | 567fb43 | 2012-07-31 16:43:07 -0700 | [diff] [blame] | 2731 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2732 | /* |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 2733 | * 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] | 2734 | * in the child subtrees. If it is unset, then the change can |
| 2735 | * occur, provided the current cgroup has no children. |
| 2736 | * |
| 2737 | * For the root cgroup, parent_mem is NULL, we allow value to be |
| 2738 | * set if there are no children. |
| 2739 | */ |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 2740 | if ((!parent_memcg || !parent_memcg->use_hierarchy) && |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2741 | (val == 1 || val == 0)) { |
Tejun Heo | ea280e7 | 2014-05-16 13:22:48 -0400 | [diff] [blame] | 2742 | if (!memcg_has_children(memcg)) |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 2743 | memcg->use_hierarchy = val; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2744 | else |
| 2745 | retval = -EBUSY; |
| 2746 | } else |
| 2747 | retval = -EINVAL; |
Glauber Costa | 567fb43 | 2012-07-31 16:43:07 -0700 | [diff] [blame] | 2748 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2749 | return retval; |
| 2750 | } |
| 2751 | |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2752 | static void tree_stat(struct mem_cgroup *memcg, unsigned long *stat) |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2753 | { |
| 2754 | struct mem_cgroup *iter; |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2755 | int i; |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2756 | |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2757 | memset(stat, 0, sizeof(*stat) * MEMCG_NR_STAT); |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2758 | |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2759 | for_each_mem_cgroup_tree(iter, memcg) { |
| 2760 | for (i = 0; i < MEMCG_NR_STAT; i++) |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 2761 | stat[i] += memcg_page_state(iter, i); |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2762 | } |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2763 | } |
| 2764 | |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2765 | static void tree_events(struct mem_cgroup *memcg, unsigned long *events) |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 2766 | { |
| 2767 | struct mem_cgroup *iter; |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2768 | int i; |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 2769 | |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2770 | memset(events, 0, sizeof(*events) * MEMCG_NR_EVENTS); |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 2771 | |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2772 | for_each_mem_cgroup_tree(iter, memcg) { |
| 2773 | for (i = 0; i < MEMCG_NR_EVENTS; i++) |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 2774 | events[i] += memcg_sum_events(iter, i); |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2775 | } |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 2776 | } |
| 2777 | |
Andrew Morton | 6f64615 | 2015-11-06 16:28:58 -0800 | [diff] [blame] | 2778 | static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap) |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2779 | { |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2780 | unsigned long val = 0; |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2781 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2782 | if (mem_cgroup_is_root(memcg)) { |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2783 | struct mem_cgroup *iter; |
| 2784 | |
| 2785 | for_each_mem_cgroup_tree(iter, memcg) { |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 2786 | val += memcg_page_state(iter, MEMCG_CACHE); |
| 2787 | val += memcg_page_state(iter, MEMCG_RSS); |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2788 | if (swap) |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 2789 | val += memcg_page_state(iter, MEMCG_SWAP); |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 2790 | } |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2791 | } else { |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2792 | if (!swap) |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2793 | val = page_counter_read(&memcg->memory); |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2794 | else |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2795 | val = page_counter_read(&memcg->memsw); |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2796 | } |
Michal Hocko | c12176d | 2015-11-05 18:50:29 -0800 | [diff] [blame] | 2797 | return val; |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2798 | } |
| 2799 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2800 | enum { |
| 2801 | RES_USAGE, |
| 2802 | RES_LIMIT, |
| 2803 | RES_MAX_USAGE, |
| 2804 | RES_FAILCNT, |
| 2805 | RES_SOFT_LIMIT, |
| 2806 | }; |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 2807 | |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 2808 | static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css, |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 2809 | struct cftype *cft) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2810 | { |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 2811 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2812 | struct page_counter *counter; |
Tejun Heo | af36f90 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 2813 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2814 | switch (MEMFILE_TYPE(cft->private)) { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2815 | case _MEM: |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2816 | counter = &memcg->memory; |
Glauber Costa | 510fc4e | 2012-12-18 14:21:47 -0800 | [diff] [blame] | 2817 | break; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2818 | case _MEMSWAP: |
| 2819 | counter = &memcg->memsw; |
| 2820 | break; |
| 2821 | case _KMEM: |
| 2822 | counter = &memcg->kmem; |
| 2823 | break; |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 2824 | case _TCP: |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 2825 | counter = &memcg->tcpmem; |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 2826 | break; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2827 | default: |
| 2828 | BUG(); |
| 2829 | } |
| 2830 | |
| 2831 | switch (MEMFILE_ATTR(cft->private)) { |
| 2832 | case RES_USAGE: |
| 2833 | if (counter == &memcg->memory) |
Michal Hocko | c12176d | 2015-11-05 18:50:29 -0800 | [diff] [blame] | 2834 | return (u64)mem_cgroup_usage(memcg, false) * PAGE_SIZE; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2835 | if (counter == &memcg->memsw) |
Michal Hocko | c12176d | 2015-11-05 18:50:29 -0800 | [diff] [blame] | 2836 | return (u64)mem_cgroup_usage(memcg, true) * PAGE_SIZE; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 2837 | return (u64)page_counter_read(counter) * PAGE_SIZE; |
| 2838 | case RES_LIMIT: |
| 2839 | return (u64)counter->limit * PAGE_SIZE; |
| 2840 | case RES_MAX_USAGE: |
| 2841 | return (u64)counter->watermark * PAGE_SIZE; |
| 2842 | case RES_FAILCNT: |
| 2843 | return counter->failcnt; |
| 2844 | case RES_SOFT_LIMIT: |
| 2845 | return (u64)memcg->soft_limit * PAGE_SIZE; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2846 | default: |
| 2847 | BUG(); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2848 | } |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2849 | } |
Glauber Costa | 510fc4e | 2012-12-18 14:21:47 -0800 | [diff] [blame] | 2850 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 2851 | #ifndef CONFIG_SLOB |
Johannes Weiner | 567e9ab | 2016-01-20 15:02:24 -0800 | [diff] [blame] | 2852 | static int memcg_online_kmem(struct mem_cgroup *memcg) |
Vladimir Davydov | d644163 | 2014-01-23 15:53:09 -0800 | [diff] [blame] | 2853 | { |
Vladimir Davydov | d644163 | 2014-01-23 15:53:09 -0800 | [diff] [blame] | 2854 | int memcg_id; |
| 2855 | |
Vladimir Davydov | b313aee | 2016-03-17 14:18:27 -0700 | [diff] [blame] | 2856 | if (cgroup_memory_nokmem) |
| 2857 | return 0; |
| 2858 | |
Vladimir Davydov | 2a4db7e | 2015-02-12 14:59:32 -0800 | [diff] [blame] | 2859 | BUG_ON(memcg->kmemcg_id >= 0); |
Johannes Weiner | 567e9ab | 2016-01-20 15:02:24 -0800 | [diff] [blame] | 2860 | BUG_ON(memcg->kmem_state); |
Vladimir Davydov | d644163 | 2014-01-23 15:53:09 -0800 | [diff] [blame] | 2861 | |
Vladimir Davydov | f3bb304 | 2014-10-09 15:28:45 -0700 | [diff] [blame] | 2862 | memcg_id = memcg_alloc_cache_id(); |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 2863 | if (memcg_id < 0) |
| 2864 | return memcg_id; |
Vladimir Davydov | d644163 | 2014-01-23 15:53:09 -0800 | [diff] [blame] | 2865 | |
Johannes Weiner | ef12947 | 2016-01-14 15:21:34 -0800 | [diff] [blame] | 2866 | static_branch_inc(&memcg_kmem_enabled_key); |
Vladimir Davydov | d644163 | 2014-01-23 15:53:09 -0800 | [diff] [blame] | 2867 | /* |
Johannes Weiner | 567e9ab | 2016-01-20 15:02:24 -0800 | [diff] [blame] | 2868 | * A memory cgroup is considered kmem-online as soon as it gets |
Vladimir Davydov | 900a38f | 2014-12-12 16:55:10 -0800 | [diff] [blame] | 2869 | * kmemcg_id. Setting the id after enabling static branching will |
Vladimir Davydov | d644163 | 2014-01-23 15:53:09 -0800 | [diff] [blame] | 2870 | * guarantee no one starts accounting before all call sites are |
| 2871 | * patched. |
| 2872 | */ |
Vladimir Davydov | 900a38f | 2014-12-12 16:55:10 -0800 | [diff] [blame] | 2873 | memcg->kmemcg_id = memcg_id; |
Johannes Weiner | 567e9ab | 2016-01-20 15:02:24 -0800 | [diff] [blame] | 2874 | memcg->kmem_state = KMEM_ONLINE; |
Tejun Heo | bc2791f | 2017-02-22 15:41:21 -0800 | [diff] [blame] | 2875 | INIT_LIST_HEAD(&memcg->kmem_caches); |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 2876 | |
| 2877 | return 0; |
Vladimir Davydov | d644163 | 2014-01-23 15:53:09 -0800 | [diff] [blame] | 2878 | } |
| 2879 | |
Johannes Weiner | 8e0a891 | 2016-01-20 15:02:26 -0800 | [diff] [blame] | 2880 | static void memcg_offline_kmem(struct mem_cgroup *memcg) |
| 2881 | { |
| 2882 | struct cgroup_subsys_state *css; |
| 2883 | struct mem_cgroup *parent, *child; |
| 2884 | int kmemcg_id; |
| 2885 | |
| 2886 | if (memcg->kmem_state != KMEM_ONLINE) |
| 2887 | return; |
| 2888 | /* |
| 2889 | * Clear the online state before clearing memcg_caches array |
| 2890 | * entries. The slab_mutex in memcg_deactivate_kmem_caches() |
| 2891 | * guarantees that no cache will be created for this cgroup |
| 2892 | * after we are done (see memcg_create_kmem_cache()). |
| 2893 | */ |
| 2894 | memcg->kmem_state = KMEM_ALLOCATED; |
| 2895 | |
| 2896 | memcg_deactivate_kmem_caches(memcg); |
| 2897 | |
| 2898 | kmemcg_id = memcg->kmemcg_id; |
| 2899 | BUG_ON(kmemcg_id < 0); |
| 2900 | |
| 2901 | parent = parent_mem_cgroup(memcg); |
| 2902 | if (!parent) |
| 2903 | parent = root_mem_cgroup; |
| 2904 | |
| 2905 | /* |
| 2906 | * Change kmemcg_id of this cgroup and all its descendants to the |
| 2907 | * parent's id, and then move all entries from this cgroup's list_lrus |
| 2908 | * to ones of the parent. After we have finished, all list_lrus |
| 2909 | * corresponding to this cgroup are guaranteed to remain empty. The |
| 2910 | * ordering is imposed by list_lru_node->lock taken by |
| 2911 | * memcg_drain_all_list_lrus(). |
| 2912 | */ |
Tejun Heo | 3a06bb7 | 2016-06-03 14:55:44 -0700 | [diff] [blame] | 2913 | rcu_read_lock(); /* can be called from css_free w/o cgroup_mutex */ |
Johannes Weiner | 8e0a891 | 2016-01-20 15:02:26 -0800 | [diff] [blame] | 2914 | css_for_each_descendant_pre(css, &memcg->css) { |
| 2915 | child = mem_cgroup_from_css(css); |
| 2916 | BUG_ON(child->kmemcg_id != kmemcg_id); |
| 2917 | child->kmemcg_id = parent->kmemcg_id; |
| 2918 | if (!memcg->use_hierarchy) |
| 2919 | break; |
| 2920 | } |
Tejun Heo | 3a06bb7 | 2016-06-03 14:55:44 -0700 | [diff] [blame] | 2921 | rcu_read_unlock(); |
| 2922 | |
Johannes Weiner | 8e0a891 | 2016-01-20 15:02:26 -0800 | [diff] [blame] | 2923 | memcg_drain_all_list_lrus(kmemcg_id, parent->kmemcg_id); |
| 2924 | |
| 2925 | memcg_free_cache_id(kmemcg_id); |
| 2926 | } |
| 2927 | |
| 2928 | static void memcg_free_kmem(struct mem_cgroup *memcg) |
| 2929 | { |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 2930 | /* css_alloc() failed, offlining didn't happen */ |
| 2931 | if (unlikely(memcg->kmem_state == KMEM_ONLINE)) |
| 2932 | memcg_offline_kmem(memcg); |
| 2933 | |
Johannes Weiner | 8e0a891 | 2016-01-20 15:02:26 -0800 | [diff] [blame] | 2934 | if (memcg->kmem_state == KMEM_ALLOCATED) { |
| 2935 | memcg_destroy_kmem_caches(memcg); |
| 2936 | static_branch_dec(&memcg_kmem_enabled_key); |
| 2937 | WARN_ON(page_counter_read(&memcg->kmem)); |
| 2938 | } |
Johannes Weiner | 8e0a891 | 2016-01-20 15:02:26 -0800 | [diff] [blame] | 2939 | } |
Vladimir Davydov | d644163 | 2014-01-23 15:53:09 -0800 | [diff] [blame] | 2940 | #else |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 2941 | static int memcg_online_kmem(struct mem_cgroup *memcg) |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 2942 | { |
| 2943 | return 0; |
| 2944 | } |
| 2945 | static void memcg_offline_kmem(struct mem_cgroup *memcg) |
| 2946 | { |
| 2947 | } |
| 2948 | static void memcg_free_kmem(struct mem_cgroup *memcg) |
| 2949 | { |
| 2950 | } |
| 2951 | #endif /* !CONFIG_SLOB */ |
| 2952 | |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 2953 | static int memcg_update_kmem_limit(struct mem_cgroup *memcg, |
| 2954 | unsigned long limit) |
| 2955 | { |
Vladimir Davydov | b313aee | 2016-03-17 14:18:27 -0700 | [diff] [blame] | 2956 | int ret; |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 2957 | |
| 2958 | mutex_lock(&memcg_limit_mutex); |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 2959 | ret = page_counter_limit(&memcg->kmem, limit); |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 2960 | mutex_unlock(&memcg_limit_mutex); |
| 2961 | return ret; |
| 2962 | } |
Glauber Costa | 510fc4e | 2012-12-18 14:21:47 -0800 | [diff] [blame] | 2963 | |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 2964 | static int memcg_update_tcp_limit(struct mem_cgroup *memcg, unsigned long limit) |
| 2965 | { |
| 2966 | int ret; |
| 2967 | |
| 2968 | mutex_lock(&memcg_limit_mutex); |
| 2969 | |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 2970 | ret = page_counter_limit(&memcg->tcpmem, limit); |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 2971 | if (ret) |
| 2972 | goto out; |
| 2973 | |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 2974 | if (!memcg->tcpmem_active) { |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 2975 | /* |
| 2976 | * The active flag needs to be written after the static_key |
| 2977 | * update. This is what guarantees that the socket activation |
Johannes Weiner | 2d75807 | 2016-10-07 17:00:58 -0700 | [diff] [blame] | 2978 | * function is the last one to run. See mem_cgroup_sk_alloc() |
| 2979 | * for details, and note that we don't mark any socket as |
| 2980 | * belonging to this memcg until that flag is up. |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 2981 | * |
| 2982 | * We need to do this, because static_keys will span multiple |
| 2983 | * sites, but we can't control their order. If we mark a socket |
| 2984 | * as accounted, but the accounting functions are not patched in |
| 2985 | * yet, we'll lose accounting. |
| 2986 | * |
Johannes Weiner | 2d75807 | 2016-10-07 17:00:58 -0700 | [diff] [blame] | 2987 | * We never race with the readers in mem_cgroup_sk_alloc(), |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 2988 | * because when this value change, the code to process it is not |
| 2989 | * patched in yet. |
| 2990 | */ |
| 2991 | static_branch_inc(&memcg_sockets_enabled_key); |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 2992 | memcg->tcpmem_active = true; |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 2993 | } |
| 2994 | out: |
| 2995 | mutex_unlock(&memcg_limit_mutex); |
| 2996 | return ret; |
| 2997 | } |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 2998 | |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 2999 | /* |
| 3000 | * The user of this function is... |
| 3001 | * RES_LIMIT. |
| 3002 | */ |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3003 | static ssize_t mem_cgroup_write(struct kernfs_open_file *of, |
| 3004 | char *buf, size_t nbytes, loff_t off) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3005 | { |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3006 | struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3007 | unsigned long nr_pages; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3008 | int ret; |
| 3009 | |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3010 | buf = strstrip(buf); |
Johannes Weiner | 650c5e5 | 2015-02-11 15:26:03 -0800 | [diff] [blame] | 3011 | ret = page_counter_memparse(buf, "-1", &nr_pages); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3012 | if (ret) |
| 3013 | return ret; |
Tejun Heo | af36f90 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 3014 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3015 | switch (MEMFILE_ATTR(of_cft(of)->private)) { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3016 | case RES_LIMIT: |
Balbir Singh | 4b3bde4 | 2009-09-23 15:56:32 -0700 | [diff] [blame] | 3017 | if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */ |
| 3018 | ret = -EINVAL; |
| 3019 | break; |
| 3020 | } |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3021 | switch (MEMFILE_TYPE(of_cft(of)->private)) { |
| 3022 | case _MEM: |
| 3023 | ret = mem_cgroup_resize_limit(memcg, nr_pages); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3024 | break; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3025 | case _MEMSWAP: |
| 3026 | ret = mem_cgroup_resize_memsw_limit(memcg, nr_pages); |
| 3027 | break; |
| 3028 | case _KMEM: |
| 3029 | ret = memcg_update_kmem_limit(memcg, nr_pages); |
| 3030 | break; |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 3031 | case _TCP: |
| 3032 | ret = memcg_update_tcp_limit(memcg, nr_pages); |
| 3033 | break; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3034 | } |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3035 | break; |
Balbir Singh | 296c81d | 2009-09-23 15:56:36 -0700 | [diff] [blame] | 3036 | case RES_SOFT_LIMIT: |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3037 | memcg->soft_limit = nr_pages; |
| 3038 | ret = 0; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 3039 | break; |
| 3040 | } |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3041 | return ret ?: nbytes; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3042 | } |
| 3043 | |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3044 | static ssize_t mem_cgroup_reset(struct kernfs_open_file *of, char *buf, |
| 3045 | size_t nbytes, loff_t off) |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3046 | { |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3047 | struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3048 | struct page_counter *counter; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3049 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3050 | switch (MEMFILE_TYPE(of_cft(of)->private)) { |
| 3051 | case _MEM: |
| 3052 | counter = &memcg->memory; |
| 3053 | break; |
| 3054 | case _MEMSWAP: |
| 3055 | counter = &memcg->memsw; |
| 3056 | break; |
| 3057 | case _KMEM: |
| 3058 | counter = &memcg->kmem; |
| 3059 | break; |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 3060 | case _TCP: |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 3061 | counter = &memcg->tcpmem; |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 3062 | break; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3063 | default: |
| 3064 | BUG(); |
| 3065 | } |
Tejun Heo | af36f90 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 3066 | |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3067 | switch (MEMFILE_ATTR(of_cft(of)->private)) { |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3068 | case RES_MAX_USAGE: |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3069 | page_counter_reset_watermark(counter); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3070 | break; |
| 3071 | case RES_FAILCNT: |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3072 | counter->failcnt = 0; |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3073 | break; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3074 | default: |
| 3075 | BUG(); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 3076 | } |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 3077 | |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3078 | return nbytes; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3079 | } |
| 3080 | |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3081 | static u64 mem_cgroup_move_charge_read(struct cgroup_subsys_state *css, |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3082 | struct cftype *cft) |
| 3083 | { |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3084 | return mem_cgroup_from_css(css)->move_charge_at_immigrate; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3085 | } |
| 3086 | |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 3087 | #ifdef CONFIG_MMU |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3088 | static int mem_cgroup_move_charge_write(struct cgroup_subsys_state *css, |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3089 | struct cftype *cft, u64 val) |
| 3090 | { |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3091 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3092 | |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 3093 | if (val & ~MOVE_MASK) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3094 | return -EINVAL; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3095 | |
Glauber Costa | ee5e847 | 2013-02-22 16:34:50 -0800 | [diff] [blame] | 3096 | /* |
| 3097 | * No kind of locking is needed in here, because ->can_attach() will |
| 3098 | * check this value once in the beginning of the process, and then carry |
| 3099 | * on with stale data. This means that changes to this value will only |
| 3100 | * affect task migrations starting after the change. |
| 3101 | */ |
| 3102 | memcg->move_charge_at_immigrate = val; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3103 | return 0; |
| 3104 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 3105 | #else |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3106 | static int mem_cgroup_move_charge_write(struct cgroup_subsys_state *css, |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 3107 | struct cftype *cft, u64 val) |
| 3108 | { |
| 3109 | return -ENOSYS; |
| 3110 | } |
| 3111 | #endif |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 3112 | |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3113 | #ifdef CONFIG_NUMA |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 3114 | static int memcg_numa_stat_show(struct seq_file *m, void *v) |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3115 | { |
Greg Thelen | 25485de | 2013-11-12 15:07:40 -0800 | [diff] [blame] | 3116 | struct numa_stat { |
| 3117 | const char *name; |
| 3118 | unsigned int lru_mask; |
| 3119 | }; |
| 3120 | |
| 3121 | static const struct numa_stat stats[] = { |
| 3122 | { "total", LRU_ALL }, |
| 3123 | { "file", LRU_ALL_FILE }, |
| 3124 | { "anon", LRU_ALL_ANON }, |
| 3125 | { "unevictable", BIT(LRU_UNEVICTABLE) }, |
| 3126 | }; |
| 3127 | const struct numa_stat *stat; |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3128 | int nid; |
Greg Thelen | 25485de | 2013-11-12 15:07:40 -0800 | [diff] [blame] | 3129 | unsigned long nr; |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 3130 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3131 | |
Greg Thelen | 25485de | 2013-11-12 15:07:40 -0800 | [diff] [blame] | 3132 | for (stat = stats; stat < stats + ARRAY_SIZE(stats); stat++) { |
| 3133 | nr = mem_cgroup_nr_lru_pages(memcg, stat->lru_mask); |
| 3134 | seq_printf(m, "%s=%lu", stat->name, nr); |
| 3135 | for_each_node_state(nid, N_MEMORY) { |
| 3136 | nr = mem_cgroup_node_nr_lru_pages(memcg, nid, |
| 3137 | stat->lru_mask); |
| 3138 | seq_printf(m, " N%d=%lu", nid, nr); |
| 3139 | } |
| 3140 | seq_putc(m, '\n'); |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3141 | } |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3142 | |
Ying Han | 071aee1 | 2013-11-12 15:07:41 -0800 | [diff] [blame] | 3143 | for (stat = stats; stat < stats + ARRAY_SIZE(stats); stat++) { |
| 3144 | struct mem_cgroup *iter; |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3145 | |
Ying Han | 071aee1 | 2013-11-12 15:07:41 -0800 | [diff] [blame] | 3146 | nr = 0; |
| 3147 | for_each_mem_cgroup_tree(iter, memcg) |
| 3148 | nr += mem_cgroup_nr_lru_pages(iter, stat->lru_mask); |
| 3149 | seq_printf(m, "hierarchical_%s=%lu", stat->name, nr); |
| 3150 | for_each_node_state(nid, N_MEMORY) { |
| 3151 | nr = 0; |
| 3152 | for_each_mem_cgroup_tree(iter, memcg) |
| 3153 | nr += mem_cgroup_node_nr_lru_pages( |
| 3154 | iter, nid, stat->lru_mask); |
| 3155 | seq_printf(m, " N%d=%lu", nid, nr); |
| 3156 | } |
| 3157 | seq_putc(m, '\n'); |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3158 | } |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3159 | |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 3160 | return 0; |
| 3161 | } |
| 3162 | #endif /* CONFIG_NUMA */ |
| 3163 | |
Johannes Weiner | df0e53d | 2017-05-03 14:55:10 -0700 | [diff] [blame] | 3164 | /* Universal VM events cgroup1 shows, original sort order */ |
| 3165 | unsigned int memcg1_events[] = { |
| 3166 | PGPGIN, |
| 3167 | PGPGOUT, |
| 3168 | PGFAULT, |
| 3169 | PGMAJFAULT, |
| 3170 | }; |
| 3171 | |
| 3172 | static const char *const memcg1_event_names[] = { |
| 3173 | "pgpgin", |
| 3174 | "pgpgout", |
| 3175 | "pgfault", |
| 3176 | "pgmajfault", |
| 3177 | }; |
| 3178 | |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 3179 | static int memcg_stat_show(struct seq_file *m, void *v) |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3180 | { |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 3181 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3182 | unsigned long memory, memsw; |
Johannes Weiner | af7c4b0 | 2012-05-29 15:07:08 -0700 | [diff] [blame] | 3183 | struct mem_cgroup *mi; |
| 3184 | unsigned int i; |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3185 | |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 3186 | BUILD_BUG_ON(ARRAY_SIZE(memcg1_stat_names) != ARRAY_SIZE(memcg1_stats)); |
Rickard Strandqvist | 70bc068 | 2014-12-12 16:56:41 -0800 | [diff] [blame] | 3187 | BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_lru_names) != NR_LRU_LISTS); |
| 3188 | |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 3189 | for (i = 0; i < ARRAY_SIZE(memcg1_stats); i++) { |
| 3190 | if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account()) |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3191 | continue; |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 3192 | seq_printf(m, "%s %lu\n", memcg1_stat_names[i], |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 3193 | memcg_page_state(memcg, memcg1_stats[i]) * |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 3194 | PAGE_SIZE); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3195 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 3196 | |
Johannes Weiner | df0e53d | 2017-05-03 14:55:10 -0700 | [diff] [blame] | 3197 | for (i = 0; i < ARRAY_SIZE(memcg1_events); i++) |
| 3198 | seq_printf(m, "%s %lu\n", memcg1_event_names[i], |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 3199 | memcg_sum_events(memcg, memcg1_events[i])); |
Johannes Weiner | af7c4b0 | 2012-05-29 15:07:08 -0700 | [diff] [blame] | 3200 | |
| 3201 | for (i = 0; i < NR_LRU_LISTS; i++) |
| 3202 | seq_printf(m, "%s %lu\n", mem_cgroup_lru_names[i], |
| 3203 | mem_cgroup_nr_lru_pages(memcg, BIT(i)) * PAGE_SIZE); |
| 3204 | |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3205 | /* Hierarchical information */ |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3206 | memory = memsw = PAGE_COUNTER_MAX; |
| 3207 | for (mi = memcg; mi; mi = parent_mem_cgroup(mi)) { |
| 3208 | memory = min(memory, mi->memory.limit); |
| 3209 | memsw = min(memsw, mi->memsw.limit); |
KAMEZAWA Hiroyuki | fee7b54 | 2009-01-07 18:08:26 -0800 | [diff] [blame] | 3210 | } |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3211 | seq_printf(m, "hierarchical_memory_limit %llu\n", |
| 3212 | (u64)memory * PAGE_SIZE); |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 3213 | if (do_memsw_account()) |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3214 | seq_printf(m, "hierarchical_memsw_limit %llu\n", |
| 3215 | (u64)memsw * PAGE_SIZE); |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3216 | |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 3217 | for (i = 0; i < ARRAY_SIZE(memcg1_stats); i++) { |
Greg Thelen | 484ebb3 | 2015-10-01 15:37:05 -0700 | [diff] [blame] | 3218 | unsigned long long val = 0; |
Johannes Weiner | af7c4b0 | 2012-05-29 15:07:08 -0700 | [diff] [blame] | 3219 | |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 3220 | if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account()) |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3221 | continue; |
Johannes Weiner | af7c4b0 | 2012-05-29 15:07:08 -0700 | [diff] [blame] | 3222 | for_each_mem_cgroup_tree(mi, memcg) |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 3223 | val += memcg_page_state(mi, memcg1_stats[i]) * |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 3224 | PAGE_SIZE; |
| 3225 | seq_printf(m, "total_%s %llu\n", memcg1_stat_names[i], val); |
Johannes Weiner | af7c4b0 | 2012-05-29 15:07:08 -0700 | [diff] [blame] | 3226 | } |
| 3227 | |
Johannes Weiner | df0e53d | 2017-05-03 14:55:10 -0700 | [diff] [blame] | 3228 | for (i = 0; i < ARRAY_SIZE(memcg1_events); i++) { |
Johannes Weiner | af7c4b0 | 2012-05-29 15:07:08 -0700 | [diff] [blame] | 3229 | unsigned long long val = 0; |
| 3230 | |
| 3231 | for_each_mem_cgroup_tree(mi, memcg) |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 3232 | val += memcg_sum_events(mi, memcg1_events[i]); |
Johannes Weiner | df0e53d | 2017-05-03 14:55:10 -0700 | [diff] [blame] | 3233 | seq_printf(m, "total_%s %llu\n", memcg1_event_names[i], val); |
Johannes Weiner | af7c4b0 | 2012-05-29 15:07:08 -0700 | [diff] [blame] | 3234 | } |
| 3235 | |
| 3236 | for (i = 0; i < NR_LRU_LISTS; i++) { |
| 3237 | unsigned long long val = 0; |
| 3238 | |
| 3239 | for_each_mem_cgroup_tree(mi, memcg) |
| 3240 | val += mem_cgroup_nr_lru_pages(mi, BIT(i)) * PAGE_SIZE; |
| 3241 | seq_printf(m, "total_%s %llu\n", mem_cgroup_lru_names[i], val); |
Daisuke Nishimura | 1dd3a27 | 2009-09-23 15:56:43 -0700 | [diff] [blame] | 3242 | } |
KAMEZAWA Hiroyuki | 14067bb | 2009-04-02 16:57:35 -0700 | [diff] [blame] | 3243 | |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3244 | #ifdef CONFIG_DEBUG_VM |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3245 | { |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 3246 | pg_data_t *pgdat; |
| 3247 | struct mem_cgroup_per_node *mz; |
Hugh Dickins | 89abfab | 2012-05-29 15:06:53 -0700 | [diff] [blame] | 3248 | struct zone_reclaim_stat *rstat; |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3249 | unsigned long recent_rotated[2] = {0, 0}; |
| 3250 | unsigned long recent_scanned[2] = {0, 0}; |
| 3251 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 3252 | for_each_online_pgdat(pgdat) { |
| 3253 | mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id); |
| 3254 | rstat = &mz->lruvec.reclaim_stat; |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3255 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 3256 | recent_rotated[0] += rstat->recent_rotated[0]; |
| 3257 | recent_rotated[1] += rstat->recent_rotated[1]; |
| 3258 | recent_scanned[0] += rstat->recent_scanned[0]; |
| 3259 | recent_scanned[1] += rstat->recent_scanned[1]; |
| 3260 | } |
Johannes Weiner | 78ccf5b | 2012-05-29 15:07:06 -0700 | [diff] [blame] | 3261 | seq_printf(m, "recent_rotated_anon %lu\n", recent_rotated[0]); |
| 3262 | seq_printf(m, "recent_rotated_file %lu\n", recent_rotated[1]); |
| 3263 | seq_printf(m, "recent_scanned_anon %lu\n", recent_scanned[0]); |
| 3264 | seq_printf(m, "recent_scanned_file %lu\n", recent_scanned[1]); |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 3265 | } |
| 3266 | #endif |
| 3267 | |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3268 | return 0; |
| 3269 | } |
| 3270 | |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3271 | static u64 mem_cgroup_swappiness_read(struct cgroup_subsys_state *css, |
| 3272 | struct cftype *cft) |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3273 | { |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3274 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3275 | |
KAMEZAWA Hiroyuki | 1f4c025 | 2011-07-26 16:08:21 -0700 | [diff] [blame] | 3276 | return mem_cgroup_swappiness(memcg); |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3277 | } |
| 3278 | |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3279 | static int mem_cgroup_swappiness_write(struct cgroup_subsys_state *css, |
| 3280 | struct cftype *cft, u64 val) |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3281 | { |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3282 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3283 | |
Johannes Weiner | 3dae7fe | 2014-06-04 16:07:01 -0700 | [diff] [blame] | 3284 | if (val > 100) |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3285 | return -EINVAL; |
| 3286 | |
Linus Torvalds | 14208b0 | 2014-06-09 15:03:33 -0700 | [diff] [blame] | 3287 | if (css->parent) |
Johannes Weiner | 3dae7fe | 2014-06-04 16:07:01 -0700 | [diff] [blame] | 3288 | memcg->swappiness = val; |
| 3289 | else |
| 3290 | vm_swappiness = val; |
Li Zefan | 068b38c | 2009-01-15 13:51:26 -0800 | [diff] [blame] | 3291 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3292 | return 0; |
| 3293 | } |
| 3294 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3295 | static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap) |
| 3296 | { |
| 3297 | struct mem_cgroup_threshold_ary *t; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3298 | unsigned long usage; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3299 | int i; |
| 3300 | |
| 3301 | rcu_read_lock(); |
| 3302 | if (!swap) |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3303 | t = rcu_dereference(memcg->thresholds.primary); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3304 | else |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3305 | t = rcu_dereference(memcg->memsw_thresholds.primary); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3306 | |
| 3307 | if (!t) |
| 3308 | goto unlock; |
| 3309 | |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 3310 | usage = mem_cgroup_usage(memcg, swap); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3311 | |
| 3312 | /* |
Sha Zhengju | 748dad3 | 2012-05-29 15:06:57 -0700 | [diff] [blame] | 3313 | * current_threshold points to threshold just below or equal to usage. |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3314 | * If it's not true, a threshold was crossed after last |
| 3315 | * call of __mem_cgroup_threshold(). |
| 3316 | */ |
Phil Carmody | 5407a56 | 2010-05-26 14:42:42 -0700 | [diff] [blame] | 3317 | i = t->current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3318 | |
| 3319 | /* |
| 3320 | * Iterate backward over array of thresholds starting from |
| 3321 | * current_threshold and check if a threshold is crossed. |
| 3322 | * If none of thresholds below usage is crossed, we read |
| 3323 | * only one element of the array here. |
| 3324 | */ |
| 3325 | for (; i >= 0 && unlikely(t->entries[i].threshold > usage); i--) |
| 3326 | eventfd_signal(t->entries[i].eventfd, 1); |
| 3327 | |
| 3328 | /* i = current_threshold + 1 */ |
| 3329 | i++; |
| 3330 | |
| 3331 | /* |
| 3332 | * Iterate forward over array of thresholds starting from |
| 3333 | * current_threshold+1 and check if a threshold is crossed. |
| 3334 | * If none of thresholds above usage is crossed, we read |
| 3335 | * only one element of the array here. |
| 3336 | */ |
| 3337 | for (; i < t->size && unlikely(t->entries[i].threshold <= usage); i++) |
| 3338 | eventfd_signal(t->entries[i].eventfd, 1); |
| 3339 | |
| 3340 | /* Update current_threshold */ |
Phil Carmody | 5407a56 | 2010-05-26 14:42:42 -0700 | [diff] [blame] | 3341 | t->current_threshold = i - 1; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3342 | unlock: |
| 3343 | rcu_read_unlock(); |
| 3344 | } |
| 3345 | |
| 3346 | static void mem_cgroup_threshold(struct mem_cgroup *memcg) |
| 3347 | { |
Kirill A. Shutemov | ad4ca5f | 2010-10-07 12:59:27 -0700 | [diff] [blame] | 3348 | while (memcg) { |
| 3349 | __mem_cgroup_threshold(memcg, false); |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 3350 | if (do_memsw_account()) |
Kirill A. Shutemov | ad4ca5f | 2010-10-07 12:59:27 -0700 | [diff] [blame] | 3351 | __mem_cgroup_threshold(memcg, true); |
| 3352 | |
| 3353 | memcg = parent_mem_cgroup(memcg); |
| 3354 | } |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3355 | } |
| 3356 | |
| 3357 | static int compare_thresholds(const void *a, const void *b) |
| 3358 | { |
| 3359 | const struct mem_cgroup_threshold *_a = a; |
| 3360 | const struct mem_cgroup_threshold *_b = b; |
| 3361 | |
Greg Thelen | 2bff24a | 2013-09-11 14:23:08 -0700 | [diff] [blame] | 3362 | if (_a->threshold > _b->threshold) |
| 3363 | return 1; |
| 3364 | |
| 3365 | if (_a->threshold < _b->threshold) |
| 3366 | return -1; |
| 3367 | |
| 3368 | return 0; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3369 | } |
| 3370 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 3371 | static int mem_cgroup_oom_notify_cb(struct mem_cgroup *memcg) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3372 | { |
| 3373 | struct mem_cgroup_eventfd_list *ev; |
| 3374 | |
Michal Hocko | 2bcf2e9 | 2014-07-30 16:08:33 -0700 | [diff] [blame] | 3375 | spin_lock(&memcg_oom_lock); |
| 3376 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 3377 | list_for_each_entry(ev, &memcg->oom_notify, list) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3378 | eventfd_signal(ev->eventfd, 1); |
Michal Hocko | 2bcf2e9 | 2014-07-30 16:08:33 -0700 | [diff] [blame] | 3379 | |
| 3380 | spin_unlock(&memcg_oom_lock); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3381 | return 0; |
| 3382 | } |
| 3383 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 3384 | static void mem_cgroup_oom_notify(struct mem_cgroup *memcg) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3385 | { |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3386 | struct mem_cgroup *iter; |
| 3387 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 3388 | for_each_mem_cgroup_tree(iter, memcg) |
KAMEZAWA Hiroyuki | 7d74b06 | 2010-10-27 15:33:41 -0700 | [diff] [blame] | 3389 | mem_cgroup_oom_notify_cb(iter); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3390 | } |
| 3391 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3392 | static int __mem_cgroup_usage_register_event(struct mem_cgroup *memcg, |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3393 | struct eventfd_ctx *eventfd, const char *args, enum res_type type) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3394 | { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3395 | struct mem_cgroup_thresholds *thresholds; |
| 3396 | struct mem_cgroup_threshold_ary *new; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3397 | unsigned long threshold; |
| 3398 | unsigned long usage; |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3399 | int i, size, ret; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3400 | |
Johannes Weiner | 650c5e5 | 2015-02-11 15:26:03 -0800 | [diff] [blame] | 3401 | ret = page_counter_memparse(args, "-1", &threshold); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3402 | if (ret) |
| 3403 | return ret; |
| 3404 | |
| 3405 | mutex_lock(&memcg->thresholds_lock); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3406 | |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 3407 | if (type == _MEM) { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3408 | thresholds = &memcg->thresholds; |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 3409 | usage = mem_cgroup_usage(memcg, false); |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 3410 | } else if (type == _MEMSWAP) { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3411 | thresholds = &memcg->memsw_thresholds; |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 3412 | usage = mem_cgroup_usage(memcg, true); |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 3413 | } else |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3414 | BUG(); |
| 3415 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3416 | /* Check if a threshold crossed before adding a new one */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3417 | if (thresholds->primary) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3418 | __mem_cgroup_threshold(memcg, type == _MEMSWAP); |
| 3419 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3420 | size = thresholds->primary ? thresholds->primary->size + 1 : 1; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3421 | |
| 3422 | /* Allocate memory for new array of thresholds */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3423 | new = kmalloc(sizeof(*new) + size * sizeof(struct mem_cgroup_threshold), |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3424 | GFP_KERNEL); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3425 | if (!new) { |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3426 | ret = -ENOMEM; |
| 3427 | goto unlock; |
| 3428 | } |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3429 | new->size = size; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3430 | |
| 3431 | /* Copy thresholds (if any) to new array */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3432 | if (thresholds->primary) { |
| 3433 | memcpy(new->entries, thresholds->primary->entries, (size - 1) * |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3434 | sizeof(struct mem_cgroup_threshold)); |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3435 | } |
| 3436 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3437 | /* Add new threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3438 | new->entries[size - 1].eventfd = eventfd; |
| 3439 | new->entries[size - 1].threshold = threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3440 | |
| 3441 | /* Sort thresholds. Registering of new threshold isn't time-critical */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3442 | sort(new->entries, size, sizeof(struct mem_cgroup_threshold), |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3443 | compare_thresholds, NULL); |
| 3444 | |
| 3445 | /* Find current threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3446 | new->current_threshold = -1; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3447 | for (i = 0; i < size; i++) { |
Sha Zhengju | 748dad3 | 2012-05-29 15:06:57 -0700 | [diff] [blame] | 3448 | if (new->entries[i].threshold <= usage) { |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3449 | /* |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3450 | * new->current_threshold will not be used until |
| 3451 | * rcu_assign_pointer(), so it's safe to increment |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3452 | * it here. |
| 3453 | */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3454 | ++new->current_threshold; |
Sha Zhengju | 748dad3 | 2012-05-29 15:06:57 -0700 | [diff] [blame] | 3455 | } else |
| 3456 | break; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3457 | } |
| 3458 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3459 | /* Free old spare buffer and save old primary buffer as spare */ |
| 3460 | kfree(thresholds->spare); |
| 3461 | thresholds->spare = thresholds->primary; |
| 3462 | |
| 3463 | rcu_assign_pointer(thresholds->primary, new); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3464 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3465 | /* To be sure that nobody uses thresholds */ |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3466 | synchronize_rcu(); |
| 3467 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3468 | unlock: |
| 3469 | mutex_unlock(&memcg->thresholds_lock); |
| 3470 | |
| 3471 | return ret; |
| 3472 | } |
| 3473 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3474 | static int mem_cgroup_usage_register_event(struct mem_cgroup *memcg, |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3475 | struct eventfd_ctx *eventfd, const char *args) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3476 | { |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3477 | return __mem_cgroup_usage_register_event(memcg, eventfd, args, _MEM); |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3478 | } |
| 3479 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3480 | static int memsw_cgroup_usage_register_event(struct mem_cgroup *memcg, |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3481 | struct eventfd_ctx *eventfd, const char *args) |
| 3482 | { |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3483 | return __mem_cgroup_usage_register_event(memcg, eventfd, args, _MEMSWAP); |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3484 | } |
| 3485 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3486 | static void __mem_cgroup_usage_unregister_event(struct mem_cgroup *memcg, |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3487 | struct eventfd_ctx *eventfd, enum res_type type) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3488 | { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3489 | struct mem_cgroup_thresholds *thresholds; |
| 3490 | struct mem_cgroup_threshold_ary *new; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 3491 | unsigned long usage; |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3492 | int i, j, size; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3493 | |
| 3494 | mutex_lock(&memcg->thresholds_lock); |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 3495 | |
| 3496 | if (type == _MEM) { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3497 | thresholds = &memcg->thresholds; |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 3498 | usage = mem_cgroup_usage(memcg, false); |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 3499 | } else if (type == _MEMSWAP) { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3500 | thresholds = &memcg->memsw_thresholds; |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 3501 | usage = mem_cgroup_usage(memcg, true); |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 3502 | } else |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3503 | BUG(); |
| 3504 | |
Anton Vorontsov | 371528c | 2012-02-24 05:14:46 +0400 | [diff] [blame] | 3505 | if (!thresholds->primary) |
| 3506 | goto unlock; |
| 3507 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3508 | /* Check if a threshold crossed before removing */ |
| 3509 | __mem_cgroup_threshold(memcg, type == _MEMSWAP); |
| 3510 | |
| 3511 | /* Calculate new number of threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3512 | size = 0; |
| 3513 | for (i = 0; i < thresholds->primary->size; i++) { |
| 3514 | if (thresholds->primary->entries[i].eventfd != eventfd) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3515 | size++; |
| 3516 | } |
| 3517 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3518 | new = thresholds->spare; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3519 | |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3520 | /* Set thresholds array to NULL if we don't have thresholds */ |
| 3521 | if (!size) { |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3522 | kfree(new); |
| 3523 | new = NULL; |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3524 | goto swap_buffers; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3525 | } |
| 3526 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3527 | new->size = size; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3528 | |
| 3529 | /* Copy thresholds and find current threshold */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3530 | new->current_threshold = -1; |
| 3531 | for (i = 0, j = 0; i < thresholds->primary->size; i++) { |
| 3532 | if (thresholds->primary->entries[i].eventfd == eventfd) |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3533 | continue; |
| 3534 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3535 | new->entries[j] = thresholds->primary->entries[i]; |
Sha Zhengju | 748dad3 | 2012-05-29 15:06:57 -0700 | [diff] [blame] | 3536 | if (new->entries[j].threshold <= usage) { |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3537 | /* |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3538 | * new->current_threshold will not be used |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3539 | * until rcu_assign_pointer(), so it's safe to increment |
| 3540 | * it here. |
| 3541 | */ |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3542 | ++new->current_threshold; |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3543 | } |
| 3544 | j++; |
| 3545 | } |
| 3546 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3547 | swap_buffers: |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3548 | /* Swap primary and spare array */ |
| 3549 | thresholds->spare = thresholds->primary; |
Sha Zhengju | 8c75776 | 2012-05-10 13:01:45 -0700 | [diff] [blame] | 3550 | |
Kirill A. Shutemov | 2c488db | 2010-05-26 14:42:47 -0700 | [diff] [blame] | 3551 | rcu_assign_pointer(thresholds->primary, new); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3552 | |
Kirill A. Shutemov | 907860e | 2010-05-26 14:42:46 -0700 | [diff] [blame] | 3553 | /* To be sure that nobody uses thresholds */ |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3554 | synchronize_rcu(); |
Martijn Coenen | 6611d8d | 2016-01-15 16:57:49 -0800 | [diff] [blame] | 3555 | |
| 3556 | /* If all events are unregistered, free the spare array */ |
| 3557 | if (!new) { |
| 3558 | kfree(thresholds->spare); |
| 3559 | thresholds->spare = NULL; |
| 3560 | } |
Anton Vorontsov | 371528c | 2012-02-24 05:14:46 +0400 | [diff] [blame] | 3561 | unlock: |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3562 | mutex_unlock(&memcg->thresholds_lock); |
Kirill A. Shutemov | 2e72b63 | 2010-03-10 15:22:24 -0800 | [diff] [blame] | 3563 | } |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3564 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3565 | static void mem_cgroup_usage_unregister_event(struct mem_cgroup *memcg, |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3566 | struct eventfd_ctx *eventfd) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3567 | { |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3568 | return __mem_cgroup_usage_unregister_event(memcg, eventfd, _MEM); |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3569 | } |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3570 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3571 | static void memsw_cgroup_usage_unregister_event(struct mem_cgroup *memcg, |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3572 | struct eventfd_ctx *eventfd) |
| 3573 | { |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3574 | return __mem_cgroup_usage_unregister_event(memcg, eventfd, _MEMSWAP); |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3575 | } |
| 3576 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3577 | static int mem_cgroup_oom_register_event(struct mem_cgroup *memcg, |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3578 | struct eventfd_ctx *eventfd, const char *args) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3579 | { |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3580 | struct mem_cgroup_eventfd_list *event; |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3581 | |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3582 | event = kmalloc(sizeof(*event), GFP_KERNEL); |
| 3583 | if (!event) |
| 3584 | return -ENOMEM; |
| 3585 | |
Michal Hocko | 1af8efe | 2011-07-26 16:08:24 -0700 | [diff] [blame] | 3586 | spin_lock(&memcg_oom_lock); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3587 | |
| 3588 | event->eventfd = eventfd; |
| 3589 | list_add(&event->list, &memcg->oom_notify); |
| 3590 | |
| 3591 | /* already in OOM ? */ |
Tejun Heo | c2b42d3 | 2015-06-24 16:58:23 -0700 | [diff] [blame] | 3592 | if (memcg->under_oom) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3593 | eventfd_signal(eventfd, 1); |
Michal Hocko | 1af8efe | 2011-07-26 16:08:24 -0700 | [diff] [blame] | 3594 | spin_unlock(&memcg_oom_lock); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3595 | |
| 3596 | return 0; |
| 3597 | } |
| 3598 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3599 | static void mem_cgroup_oom_unregister_event(struct mem_cgroup *memcg, |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3600 | struct eventfd_ctx *eventfd) |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3601 | { |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3602 | struct mem_cgroup_eventfd_list *ev, *tmp; |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3603 | |
Michal Hocko | 1af8efe | 2011-07-26 16:08:24 -0700 | [diff] [blame] | 3604 | spin_lock(&memcg_oom_lock); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3605 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 3606 | list_for_each_entry_safe(ev, tmp, &memcg->oom_notify, list) { |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3607 | if (ev->eventfd == eventfd) { |
| 3608 | list_del(&ev->list); |
| 3609 | kfree(ev); |
| 3610 | } |
| 3611 | } |
| 3612 | |
Michal Hocko | 1af8efe | 2011-07-26 16:08:24 -0700 | [diff] [blame] | 3613 | spin_unlock(&memcg_oom_lock); |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 3614 | } |
| 3615 | |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 3616 | static int mem_cgroup_oom_control_read(struct seq_file *sf, void *v) |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3617 | { |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 3618 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(sf)); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3619 | |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 3620 | seq_printf(sf, "oom_kill_disable %d\n", memcg->oom_kill_disable); |
Tejun Heo | c2b42d3 | 2015-06-24 16:58:23 -0700 | [diff] [blame] | 3621 | seq_printf(sf, "under_oom %d\n", (bool)memcg->under_oom); |
Konstantin Khlebnikov | 8e675f7 | 2017-07-06 15:40:28 -0700 | [diff] [blame] | 3622 | seq_printf(sf, "oom_kill %lu\n", memcg_sum_events(memcg, OOM_KILL)); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3623 | return 0; |
| 3624 | } |
| 3625 | |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3626 | static int mem_cgroup_oom_control_write(struct cgroup_subsys_state *css, |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3627 | struct cftype *cft, u64 val) |
| 3628 | { |
Tejun Heo | 182446d | 2013-08-08 20:11:24 -0400 | [diff] [blame] | 3629 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3630 | |
| 3631 | /* cannot set to root cgroup and only 0 and 1 are allowed */ |
Linus Torvalds | 14208b0 | 2014-06-09 15:03:33 -0700 | [diff] [blame] | 3632 | if (!css->parent || !((val == 0) || (val == 1))) |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3633 | return -EINVAL; |
| 3634 | |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 3635 | memcg->oom_kill_disable = val; |
KAMEZAWA Hiroyuki | 4d845eb | 2010-06-29 15:05:18 -0700 | [diff] [blame] | 3636 | if (!val) |
Raghavendra K T | c0ff4b8 | 2011-11-02 13:38:15 -0700 | [diff] [blame] | 3637 | memcg_oom_recover(memcg); |
Johannes Weiner | 3dae7fe | 2014-06-04 16:07:01 -0700 | [diff] [blame] | 3638 | |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 3639 | return 0; |
| 3640 | } |
| 3641 | |
Tejun Heo | 52ebea7 | 2015-05-22 17:13:37 -0400 | [diff] [blame] | 3642 | #ifdef CONFIG_CGROUP_WRITEBACK |
| 3643 | |
| 3644 | struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg) |
| 3645 | { |
| 3646 | return &memcg->cgwb_list; |
| 3647 | } |
| 3648 | |
Tejun Heo | 841710a | 2015-05-22 18:23:33 -0400 | [diff] [blame] | 3649 | static int memcg_wb_domain_init(struct mem_cgroup *memcg, gfp_t gfp) |
| 3650 | { |
| 3651 | return wb_domain_init(&memcg->cgwb_domain, gfp); |
| 3652 | } |
| 3653 | |
| 3654 | static void memcg_wb_domain_exit(struct mem_cgroup *memcg) |
| 3655 | { |
| 3656 | wb_domain_exit(&memcg->cgwb_domain); |
| 3657 | } |
| 3658 | |
Tejun Heo | 2529bb3 | 2015-05-22 18:23:34 -0400 | [diff] [blame] | 3659 | static void memcg_wb_domain_size_changed(struct mem_cgroup *memcg) |
| 3660 | { |
| 3661 | wb_domain_size_changed(&memcg->cgwb_domain); |
| 3662 | } |
| 3663 | |
Tejun Heo | 841710a | 2015-05-22 18:23:33 -0400 | [diff] [blame] | 3664 | struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) |
| 3665 | { |
| 3666 | struct mem_cgroup *memcg = mem_cgroup_from_css(wb->memcg_css); |
| 3667 | |
| 3668 | if (!memcg->css.parent) |
| 3669 | return NULL; |
| 3670 | |
| 3671 | return &memcg->cgwb_domain; |
| 3672 | } |
| 3673 | |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3674 | /** |
| 3675 | * mem_cgroup_wb_stats - retrieve writeback related stats from its memcg |
| 3676 | * @wb: bdi_writeback in question |
Tejun Heo | c5edf9c | 2015-09-29 13:04:26 -0400 | [diff] [blame] | 3677 | * @pfilepages: out parameter for number of file pages |
| 3678 | * @pheadroom: out parameter for number of allocatable pages according to memcg |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3679 | * @pdirty: out parameter for number of dirty pages |
| 3680 | * @pwriteback: out parameter for number of pages under writeback |
| 3681 | * |
Tejun Heo | c5edf9c | 2015-09-29 13:04:26 -0400 | [diff] [blame] | 3682 | * Determine the numbers of file, headroom, dirty, and writeback pages in |
| 3683 | * @wb's memcg. File, dirty and writeback are self-explanatory. Headroom |
| 3684 | * is a bit more involved. |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3685 | * |
Tejun Heo | c5edf9c | 2015-09-29 13:04:26 -0400 | [diff] [blame] | 3686 | * A memcg's headroom is "min(max, high) - used". In the hierarchy, the |
| 3687 | * headroom is calculated as the lowest headroom of itself and the |
| 3688 | * ancestors. Note that this doesn't consider the actual amount of |
| 3689 | * available memory in the system. The caller should further cap |
| 3690 | * *@pheadroom accordingly. |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3691 | */ |
Tejun Heo | c5edf9c | 2015-09-29 13:04:26 -0400 | [diff] [blame] | 3692 | void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, |
| 3693 | unsigned long *pheadroom, unsigned long *pdirty, |
| 3694 | unsigned long *pwriteback) |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3695 | { |
| 3696 | struct mem_cgroup *memcg = mem_cgroup_from_css(wb->memcg_css); |
| 3697 | struct mem_cgroup *parent; |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3698 | |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 3699 | *pdirty = memcg_page_state(memcg, NR_FILE_DIRTY); |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3700 | |
| 3701 | /* this should eventually include NR_UNSTABLE_NFS */ |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 3702 | *pwriteback = memcg_page_state(memcg, NR_WRITEBACK); |
Tejun Heo | c5edf9c | 2015-09-29 13:04:26 -0400 | [diff] [blame] | 3703 | *pfilepages = mem_cgroup_nr_lru_pages(memcg, (1 << LRU_INACTIVE_FILE) | |
| 3704 | (1 << LRU_ACTIVE_FILE)); |
| 3705 | *pheadroom = PAGE_COUNTER_MAX; |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3706 | |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3707 | while ((parent = parent_mem_cgroup(memcg))) { |
| 3708 | unsigned long ceiling = min(memcg->memory.limit, memcg->high); |
| 3709 | unsigned long used = page_counter_read(&memcg->memory); |
| 3710 | |
Tejun Heo | c5edf9c | 2015-09-29 13:04:26 -0400 | [diff] [blame] | 3711 | *pheadroom = min(*pheadroom, ceiling - min(ceiling, used)); |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3712 | memcg = parent; |
| 3713 | } |
Tejun Heo | c2aa723 | 2015-05-22 18:23:35 -0400 | [diff] [blame] | 3714 | } |
| 3715 | |
Tejun Heo | 841710a | 2015-05-22 18:23:33 -0400 | [diff] [blame] | 3716 | #else /* CONFIG_CGROUP_WRITEBACK */ |
| 3717 | |
| 3718 | static int memcg_wb_domain_init(struct mem_cgroup *memcg, gfp_t gfp) |
| 3719 | { |
| 3720 | return 0; |
| 3721 | } |
| 3722 | |
| 3723 | static void memcg_wb_domain_exit(struct mem_cgroup *memcg) |
| 3724 | { |
| 3725 | } |
| 3726 | |
Tejun Heo | 2529bb3 | 2015-05-22 18:23:34 -0400 | [diff] [blame] | 3727 | static void memcg_wb_domain_size_changed(struct mem_cgroup *memcg) |
| 3728 | { |
| 3729 | } |
| 3730 | |
Tejun Heo | 52ebea7 | 2015-05-22 17:13:37 -0400 | [diff] [blame] | 3731 | #endif /* CONFIG_CGROUP_WRITEBACK */ |
| 3732 | |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3733 | /* |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3734 | * DO NOT USE IN NEW FILES. |
| 3735 | * |
| 3736 | * "cgroup.event_control" implementation. |
| 3737 | * |
| 3738 | * This is way over-engineered. It tries to support fully configurable |
| 3739 | * events for each user. Such level of flexibility is completely |
| 3740 | * unnecessary especially in the light of the planned unified hierarchy. |
| 3741 | * |
| 3742 | * Please deprecate this and replace with something simpler if at all |
| 3743 | * possible. |
| 3744 | */ |
| 3745 | |
| 3746 | /* |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3747 | * Unregister event and free resources. |
| 3748 | * |
| 3749 | * Gets called from workqueue. |
| 3750 | */ |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3751 | static void memcg_event_remove(struct work_struct *work) |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3752 | { |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3753 | struct mem_cgroup_event *event = |
| 3754 | container_of(work, struct mem_cgroup_event, remove); |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3755 | struct mem_cgroup *memcg = event->memcg; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3756 | |
| 3757 | remove_wait_queue(event->wqh, &event->wait); |
| 3758 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3759 | event->unregister_event(memcg, event->eventfd); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3760 | |
| 3761 | /* Notify userspace the event is going away. */ |
| 3762 | eventfd_signal(event->eventfd, 1); |
| 3763 | |
| 3764 | eventfd_ctx_put(event->eventfd); |
| 3765 | kfree(event); |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3766 | css_put(&memcg->css); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3767 | } |
| 3768 | |
| 3769 | /* |
| 3770 | * Gets called on POLLHUP on eventfd when user closes it. |
| 3771 | * |
| 3772 | * Called with wqh->lock held and interrupts disabled. |
| 3773 | */ |
Ingo Molnar | ac6424b | 2017-06-20 12:06:13 +0200 | [diff] [blame] | 3774 | static int memcg_event_wake(wait_queue_entry_t *wait, unsigned mode, |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3775 | int sync, void *key) |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3776 | { |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3777 | struct mem_cgroup_event *event = |
| 3778 | container_of(wait, struct mem_cgroup_event, wait); |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3779 | struct mem_cgroup *memcg = event->memcg; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3780 | unsigned long flags = (unsigned long)key; |
| 3781 | |
| 3782 | if (flags & POLLHUP) { |
| 3783 | /* |
| 3784 | * If the event has been detached at cgroup removal, we |
| 3785 | * can simply return knowing the other side will cleanup |
| 3786 | * for us. |
| 3787 | * |
| 3788 | * We can't race against event freeing since the other |
| 3789 | * side will require wqh->lock via remove_wait_queue(), |
| 3790 | * which we hold. |
| 3791 | */ |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3792 | spin_lock(&memcg->event_list_lock); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3793 | if (!list_empty(&event->list)) { |
| 3794 | list_del_init(&event->list); |
| 3795 | /* |
| 3796 | * We are in atomic context, but cgroup_event_remove() |
| 3797 | * may sleep, so we have to call it in workqueue. |
| 3798 | */ |
| 3799 | schedule_work(&event->remove); |
| 3800 | } |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3801 | spin_unlock(&memcg->event_list_lock); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3802 | } |
| 3803 | |
| 3804 | return 0; |
| 3805 | } |
| 3806 | |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3807 | static void memcg_event_ptable_queue_proc(struct file *file, |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3808 | wait_queue_head_t *wqh, poll_table *pt) |
| 3809 | { |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3810 | struct mem_cgroup_event *event = |
| 3811 | container_of(pt, struct mem_cgroup_event, pt); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3812 | |
| 3813 | event->wqh = wqh; |
| 3814 | add_wait_queue(wqh, &event->wait); |
| 3815 | } |
| 3816 | |
| 3817 | /* |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3818 | * DO NOT USE IN NEW FILES. |
| 3819 | * |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3820 | * Parse input and register new cgroup event handler. |
| 3821 | * |
| 3822 | * Input must be in format '<event_fd> <control_fd> <args>'. |
| 3823 | * Interpretation of args is defined by control file implementation. |
| 3824 | */ |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3825 | static ssize_t memcg_write_event_control(struct kernfs_open_file *of, |
| 3826 | char *buf, size_t nbytes, loff_t off) |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3827 | { |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3828 | struct cgroup_subsys_state *css = of_css(of); |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3829 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3830 | struct mem_cgroup_event *event; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3831 | struct cgroup_subsys_state *cfile_css; |
| 3832 | unsigned int efd, cfd; |
| 3833 | struct fd efile; |
| 3834 | struct fd cfile; |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3835 | const char *name; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3836 | char *endp; |
| 3837 | int ret; |
| 3838 | |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3839 | buf = strstrip(buf); |
| 3840 | |
| 3841 | efd = simple_strtoul(buf, &endp, 10); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3842 | if (*endp != ' ') |
| 3843 | return -EINVAL; |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3844 | buf = endp + 1; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3845 | |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3846 | cfd = simple_strtoul(buf, &endp, 10); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3847 | if ((*endp != ' ') && (*endp != '\0')) |
| 3848 | return -EINVAL; |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3849 | buf = endp + 1; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3850 | |
| 3851 | event = kzalloc(sizeof(*event), GFP_KERNEL); |
| 3852 | if (!event) |
| 3853 | return -ENOMEM; |
| 3854 | |
Tejun Heo | 59b6f87 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3855 | event->memcg = memcg; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3856 | INIT_LIST_HEAD(&event->list); |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3857 | init_poll_funcptr(&event->pt, memcg_event_ptable_queue_proc); |
| 3858 | init_waitqueue_func_entry(&event->wait, memcg_event_wake); |
| 3859 | INIT_WORK(&event->remove, memcg_event_remove); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3860 | |
| 3861 | efile = fdget(efd); |
| 3862 | if (!efile.file) { |
| 3863 | ret = -EBADF; |
| 3864 | goto out_kfree; |
| 3865 | } |
| 3866 | |
| 3867 | event->eventfd = eventfd_ctx_fileget(efile.file); |
| 3868 | if (IS_ERR(event->eventfd)) { |
| 3869 | ret = PTR_ERR(event->eventfd); |
| 3870 | goto out_put_efile; |
| 3871 | } |
| 3872 | |
| 3873 | cfile = fdget(cfd); |
| 3874 | if (!cfile.file) { |
| 3875 | ret = -EBADF; |
| 3876 | goto out_put_eventfd; |
| 3877 | } |
| 3878 | |
| 3879 | /* the process need read permission on control file */ |
| 3880 | /* AV: shouldn't we check that it's been opened for read instead? */ |
| 3881 | ret = inode_permission(file_inode(cfile.file), MAY_READ); |
| 3882 | if (ret < 0) |
| 3883 | goto out_put_cfile; |
| 3884 | |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3885 | /* |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3886 | * Determine the event callbacks and set them in @event. This used |
| 3887 | * to be done via struct cftype but cgroup core no longer knows |
| 3888 | * about these events. The following is crude but the whole thing |
| 3889 | * is for compatibility anyway. |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 3890 | * |
| 3891 | * DO NOT ADD NEW FILES. |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3892 | */ |
Al Viro | b583043 | 2014-10-31 01:22:04 -0400 | [diff] [blame] | 3893 | name = cfile.file->f_path.dentry->d_name.name; |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3894 | |
| 3895 | if (!strcmp(name, "memory.usage_in_bytes")) { |
| 3896 | event->register_event = mem_cgroup_usage_register_event; |
| 3897 | event->unregister_event = mem_cgroup_usage_unregister_event; |
| 3898 | } else if (!strcmp(name, "memory.oom_control")) { |
| 3899 | event->register_event = mem_cgroup_oom_register_event; |
| 3900 | event->unregister_event = mem_cgroup_oom_unregister_event; |
| 3901 | } else if (!strcmp(name, "memory.pressure_level")) { |
| 3902 | event->register_event = vmpressure_register_event; |
| 3903 | event->unregister_event = vmpressure_unregister_event; |
| 3904 | } else if (!strcmp(name, "memory.memsw.usage_in_bytes")) { |
Tejun Heo | 347c4a8 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3905 | event->register_event = memsw_cgroup_usage_register_event; |
| 3906 | event->unregister_event = memsw_cgroup_usage_unregister_event; |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3907 | } else { |
| 3908 | ret = -EINVAL; |
| 3909 | goto out_put_cfile; |
| 3910 | } |
| 3911 | |
| 3912 | /* |
Tejun Heo | b5557c4 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3913 | * Verify @cfile should belong to @css. Also, remaining events are |
| 3914 | * automatically removed on cgroup destruction but the removal is |
| 3915 | * asynchronous, so take an extra ref on @css. |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3916 | */ |
Al Viro | b583043 | 2014-10-31 01:22:04 -0400 | [diff] [blame] | 3917 | cfile_css = css_tryget_online_from_dir(cfile.file->f_path.dentry->d_parent, |
Tejun Heo | ec903c0 | 2014-05-13 12:11:01 -0400 | [diff] [blame] | 3918 | &memory_cgrp_subsys); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3919 | ret = -EINVAL; |
Tejun Heo | 5a17f54 | 2014-02-11 11:52:47 -0500 | [diff] [blame] | 3920 | if (IS_ERR(cfile_css)) |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3921 | goto out_put_cfile; |
Tejun Heo | 5a17f54 | 2014-02-11 11:52:47 -0500 | [diff] [blame] | 3922 | if (cfile_css != css) { |
| 3923 | css_put(cfile_css); |
| 3924 | goto out_put_cfile; |
| 3925 | } |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3926 | |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3927 | ret = event->register_event(memcg, event->eventfd, buf); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3928 | if (ret) |
| 3929 | goto out_put_css; |
| 3930 | |
| 3931 | efile.file->f_op->poll(efile.file, &event->pt); |
| 3932 | |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 3933 | spin_lock(&memcg->event_list_lock); |
| 3934 | list_add(&event->list, &memcg->event_list); |
| 3935 | spin_unlock(&memcg->event_list_lock); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3936 | |
| 3937 | fdput(cfile); |
| 3938 | fdput(efile); |
| 3939 | |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3940 | return nbytes; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3941 | |
| 3942 | out_put_css: |
Tejun Heo | b5557c4 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3943 | css_put(css); |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 3944 | out_put_cfile: |
| 3945 | fdput(cfile); |
| 3946 | out_put_eventfd: |
| 3947 | eventfd_ctx_put(event->eventfd); |
| 3948 | out_put_efile: |
| 3949 | fdput(efile); |
| 3950 | out_kfree: |
| 3951 | kfree(event); |
| 3952 | |
| 3953 | return ret; |
| 3954 | } |
| 3955 | |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 3956 | static struct cftype mem_cgroup_legacy_files[] = { |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3957 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 3958 | .name = "usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3959 | .private = MEMFILE_PRIVATE(_MEM, RES_USAGE), |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 3960 | .read_u64 = mem_cgroup_read_u64, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3961 | }, |
| 3962 | { |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3963 | .name = "max_usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3964 | .private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE), |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3965 | .write = mem_cgroup_reset, |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 3966 | .read_u64 = mem_cgroup_read_u64, |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 3967 | }, |
| 3968 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 3969 | .name = "limit_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3970 | .private = MEMFILE_PRIVATE(_MEM, RES_LIMIT), |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3971 | .write = mem_cgroup_write, |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 3972 | .read_u64 = mem_cgroup_read_u64, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3973 | }, |
| 3974 | { |
Balbir Singh | 296c81d | 2009-09-23 15:56:36 -0700 | [diff] [blame] | 3975 | .name = "soft_limit_in_bytes", |
| 3976 | .private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT), |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3977 | .write = mem_cgroup_write, |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 3978 | .read_u64 = mem_cgroup_read_u64, |
Balbir Singh | 296c81d | 2009-09-23 15:56:36 -0700 | [diff] [blame] | 3979 | }, |
| 3980 | { |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3981 | .name = "failcnt", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 3982 | .private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT), |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3983 | .write = mem_cgroup_reset, |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 3984 | .read_u64 = mem_cgroup_read_u64, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 3985 | }, |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 3986 | { |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3987 | .name = "stat", |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 3988 | .seq_show = memcg_stat_show, |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 3989 | }, |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3990 | { |
| 3991 | .name = "force_empty", |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 3992 | .write = mem_cgroup_force_empty_write, |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 3993 | }, |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 3994 | { |
| 3995 | .name = "use_hierarchy", |
| 3996 | .write_u64 = mem_cgroup_hierarchy_write, |
| 3997 | .read_u64 = mem_cgroup_hierarchy_read, |
| 3998 | }, |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 3999 | { |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 4000 | .name = "cgroup.event_control", /* XXX: for compat */ |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 4001 | .write = memcg_write_event_control, |
Tejun Heo | 7dbdb19 | 2015-09-18 17:54:23 -0400 | [diff] [blame] | 4002 | .flags = CFTYPE_NO_PREFIX | CFTYPE_WORLD_WRITABLE, |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 4003 | }, |
| 4004 | { |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame] | 4005 | .name = "swappiness", |
| 4006 | .read_u64 = mem_cgroup_swappiness_read, |
| 4007 | .write_u64 = mem_cgroup_swappiness_write, |
| 4008 | }, |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4009 | { |
| 4010 | .name = "move_charge_at_immigrate", |
| 4011 | .read_u64 = mem_cgroup_move_charge_read, |
| 4012 | .write_u64 = mem_cgroup_move_charge_write, |
| 4013 | }, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4014 | { |
| 4015 | .name = "oom_control", |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 4016 | .seq_show = mem_cgroup_oom_control_read, |
KAMEZAWA Hiroyuki | 3c11ecf | 2010-05-26 14:42:37 -0700 | [diff] [blame] | 4017 | .write_u64 = mem_cgroup_oom_control_write, |
KAMEZAWA Hiroyuki | 9490ff2 | 2010-05-26 14:42:36 -0700 | [diff] [blame] | 4018 | .private = MEMFILE_PRIVATE(_OOM_TYPE, OOM_CONTROL), |
| 4019 | }, |
Anton Vorontsov | 70ddf63 | 2013-04-29 15:08:31 -0700 | [diff] [blame] | 4020 | { |
| 4021 | .name = "pressure_level", |
Anton Vorontsov | 70ddf63 | 2013-04-29 15:08:31 -0700 | [diff] [blame] | 4022 | }, |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 4023 | #ifdef CONFIG_NUMA |
| 4024 | { |
| 4025 | .name = "numa_stat", |
Tejun Heo | 2da8ca8 | 2013-12-05 12:28:04 -0500 | [diff] [blame] | 4026 | .seq_show = memcg_numa_stat_show, |
Ying Han | 406eb0c | 2011-05-26 16:25:37 -0700 | [diff] [blame] | 4027 | }, |
| 4028 | #endif |
Glauber Costa | 510fc4e | 2012-12-18 14:21:47 -0800 | [diff] [blame] | 4029 | { |
| 4030 | .name = "kmem.limit_in_bytes", |
| 4031 | .private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT), |
Tejun Heo | 451af50 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 4032 | .write = mem_cgroup_write, |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 4033 | .read_u64 = mem_cgroup_read_u64, |
Glauber Costa | 510fc4e | 2012-12-18 14:21:47 -0800 | [diff] [blame] | 4034 | }, |
| 4035 | { |
| 4036 | .name = "kmem.usage_in_bytes", |
| 4037 | .private = MEMFILE_PRIVATE(_KMEM, RES_USAGE), |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 4038 | .read_u64 = mem_cgroup_read_u64, |
Glauber Costa | 510fc4e | 2012-12-18 14:21:47 -0800 | [diff] [blame] | 4039 | }, |
| 4040 | { |
| 4041 | .name = "kmem.failcnt", |
| 4042 | .private = MEMFILE_PRIVATE(_KMEM, RES_FAILCNT), |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 4043 | .write = mem_cgroup_reset, |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 4044 | .read_u64 = mem_cgroup_read_u64, |
Glauber Costa | 510fc4e | 2012-12-18 14:21:47 -0800 | [diff] [blame] | 4045 | }, |
| 4046 | { |
| 4047 | .name = "kmem.max_usage_in_bytes", |
| 4048 | .private = MEMFILE_PRIVATE(_KMEM, RES_MAX_USAGE), |
Tejun Heo | 6770c64 | 2014-05-13 12:16:21 -0400 | [diff] [blame] | 4049 | .write = mem_cgroup_reset, |
Tejun Heo | 791badb | 2013-12-05 12:28:02 -0500 | [diff] [blame] | 4050 | .read_u64 = mem_cgroup_read_u64, |
Glauber Costa | 510fc4e | 2012-12-18 14:21:47 -0800 | [diff] [blame] | 4051 | }, |
Yang Shi | 5b36577 | 2017-11-15 17:32:03 -0800 | [diff] [blame^] | 4052 | #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG) |
Glauber Costa | 749c541 | 2012-12-18 14:23:01 -0800 | [diff] [blame] | 4053 | { |
| 4054 | .name = "kmem.slabinfo", |
Tejun Heo | bc2791f | 2017-02-22 15:41:21 -0800 | [diff] [blame] | 4055 | .seq_start = memcg_slab_start, |
| 4056 | .seq_next = memcg_slab_next, |
| 4057 | .seq_stop = memcg_slab_stop, |
Vladimir Davydov | b047501 | 2014-12-10 15:44:19 -0800 | [diff] [blame] | 4058 | .seq_show = memcg_slab_show, |
Glauber Costa | 749c541 | 2012-12-18 14:23:01 -0800 | [diff] [blame] | 4059 | }, |
| 4060 | #endif |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 4061 | { |
| 4062 | .name = "kmem.tcp.limit_in_bytes", |
| 4063 | .private = MEMFILE_PRIVATE(_TCP, RES_LIMIT), |
| 4064 | .write = mem_cgroup_write, |
| 4065 | .read_u64 = mem_cgroup_read_u64, |
| 4066 | }, |
| 4067 | { |
| 4068 | .name = "kmem.tcp.usage_in_bytes", |
| 4069 | .private = MEMFILE_PRIVATE(_TCP, RES_USAGE), |
| 4070 | .read_u64 = mem_cgroup_read_u64, |
| 4071 | }, |
| 4072 | { |
| 4073 | .name = "kmem.tcp.failcnt", |
| 4074 | .private = MEMFILE_PRIVATE(_TCP, RES_FAILCNT), |
| 4075 | .write = mem_cgroup_reset, |
| 4076 | .read_u64 = mem_cgroup_read_u64, |
| 4077 | }, |
| 4078 | { |
| 4079 | .name = "kmem.tcp.max_usage_in_bytes", |
| 4080 | .private = MEMFILE_PRIVATE(_TCP, RES_MAX_USAGE), |
| 4081 | .write = mem_cgroup_reset, |
| 4082 | .read_u64 = mem_cgroup_read_u64, |
| 4083 | }, |
Tejun Heo | 6bc1034 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 4084 | { }, /* terminate */ |
Tejun Heo | af36f90 | 2012-04-01 12:09:55 -0700 | [diff] [blame] | 4085 | }; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 4086 | |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4087 | /* |
| 4088 | * Private memory cgroup IDR |
| 4089 | * |
| 4090 | * Swap-out records and page cache shadow entries need to store memcg |
| 4091 | * references in constrained space, so we maintain an ID space that is |
| 4092 | * limited to 16 bit (MEM_CGROUP_ID_MAX), limiting the total number of |
| 4093 | * memory-controlled cgroups to 64k. |
| 4094 | * |
| 4095 | * However, there usually are many references to the oflline CSS after |
| 4096 | * the cgroup has been destroyed, such as page cache or reclaimable |
| 4097 | * slab objects, that don't need to hang on to the ID. We want to keep |
| 4098 | * those dead CSS from occupying IDs, or we might quickly exhaust the |
| 4099 | * relatively small ID space and prevent the creation of new cgroups |
| 4100 | * even when there are much fewer than 64k cgroups - possibly none. |
| 4101 | * |
| 4102 | * Maintain a private 16-bit ID space for memcg, and allow the ID to |
| 4103 | * be freed and recycled when it's no longer needed, which is usually |
| 4104 | * when the CSS is offlined. |
| 4105 | * |
| 4106 | * The only exception to that are records of swapped out tmpfs/shmem |
| 4107 | * pages that need to be attributed to live ancestors on swapin. But |
| 4108 | * those references are manageable from userspace. |
| 4109 | */ |
| 4110 | |
| 4111 | static DEFINE_IDR(mem_cgroup_idr); |
| 4112 | |
Vladimir Davydov | 615d66c | 2016-08-11 15:33:03 -0700 | [diff] [blame] | 4113 | static void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n) |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4114 | { |
Vladimir Davydov | 58fa2a5 | 2016-10-07 16:57:29 -0700 | [diff] [blame] | 4115 | VM_BUG_ON(atomic_read(&memcg->id.ref) <= 0); |
Vladimir Davydov | 615d66c | 2016-08-11 15:33:03 -0700 | [diff] [blame] | 4116 | atomic_add(n, &memcg->id.ref); |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4117 | } |
| 4118 | |
Vladimir Davydov | 615d66c | 2016-08-11 15:33:03 -0700 | [diff] [blame] | 4119 | static void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n) |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4120 | { |
Vladimir Davydov | 58fa2a5 | 2016-10-07 16:57:29 -0700 | [diff] [blame] | 4121 | VM_BUG_ON(atomic_read(&memcg->id.ref) < n); |
Vladimir Davydov | 615d66c | 2016-08-11 15:33:03 -0700 | [diff] [blame] | 4122 | if (atomic_sub_and_test(n, &memcg->id.ref)) { |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4123 | idr_remove(&mem_cgroup_idr, memcg->id.id); |
| 4124 | memcg->id.id = 0; |
| 4125 | |
| 4126 | /* Memcg ID pins CSS */ |
| 4127 | css_put(&memcg->css); |
| 4128 | } |
| 4129 | } |
| 4130 | |
Vladimir Davydov | 615d66c | 2016-08-11 15:33:03 -0700 | [diff] [blame] | 4131 | static inline void mem_cgroup_id_get(struct mem_cgroup *memcg) |
| 4132 | { |
| 4133 | mem_cgroup_id_get_many(memcg, 1); |
| 4134 | } |
| 4135 | |
| 4136 | static inline void mem_cgroup_id_put(struct mem_cgroup *memcg) |
| 4137 | { |
| 4138 | mem_cgroup_id_put_many(memcg, 1); |
| 4139 | } |
| 4140 | |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4141 | /** |
| 4142 | * mem_cgroup_from_id - look up a memcg from a memcg id |
| 4143 | * @id: the memcg id to look up |
| 4144 | * |
| 4145 | * Caller must hold rcu_read_lock(). |
| 4146 | */ |
| 4147 | struct mem_cgroup *mem_cgroup_from_id(unsigned short id) |
| 4148 | { |
| 4149 | WARN_ON_ONCE(!rcu_read_lock_held()); |
| 4150 | return idr_find(&mem_cgroup_idr, id); |
| 4151 | } |
| 4152 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 4153 | static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4154 | { |
| 4155 | struct mem_cgroup_per_node *pn; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 4156 | int tmp = node; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4157 | /* |
| 4158 | * This routine is called against possible nodes. |
| 4159 | * But it's BUG to call kmalloc() against offline node. |
| 4160 | * |
| 4161 | * TODO: this routine can waste much memory for nodes which will |
| 4162 | * never be onlined. It's better to use memory hotplug callback |
| 4163 | * function. |
| 4164 | */ |
KAMEZAWA Hiroyuki | 41e3355 | 2008-04-08 17:41:54 -0700 | [diff] [blame] | 4165 | if (!node_state(node, N_NORMAL_MEMORY)) |
| 4166 | tmp = -1; |
Jesper Juhl | 17295c8 | 2011-01-13 15:47:42 -0800 | [diff] [blame] | 4167 | pn = kzalloc_node(sizeof(*pn), GFP_KERNEL, tmp); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4168 | if (!pn) |
| 4169 | return 1; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4170 | |
Johannes Weiner | 00f3ca2 | 2017-07-06 15:40:52 -0700 | [diff] [blame] | 4171 | pn->lruvec_stat = alloc_percpu(struct lruvec_stat); |
| 4172 | if (!pn->lruvec_stat) { |
| 4173 | kfree(pn); |
| 4174 | return 1; |
| 4175 | } |
| 4176 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 4177 | lruvec_init(&pn->lruvec); |
| 4178 | pn->usage_in_excess = 0; |
| 4179 | pn->on_tree = false; |
| 4180 | pn->memcg = memcg; |
| 4181 | |
Johannes Weiner | 54f72fe | 2013-07-08 15:59:49 -0700 | [diff] [blame] | 4182 | memcg->nodeinfo[node] = pn; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 4183 | return 0; |
| 4184 | } |
| 4185 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 4186 | static void free_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node) |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4187 | { |
Johannes Weiner | 00f3ca2 | 2017-07-06 15:40:52 -0700 | [diff] [blame] | 4188 | struct mem_cgroup_per_node *pn = memcg->nodeinfo[node]; |
| 4189 | |
| 4190 | free_percpu(pn->lruvec_stat); |
| 4191 | kfree(pn); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 4192 | } |
| 4193 | |
Tahsin Erdogan | 40e952f | 2017-03-09 16:17:26 -0800 | [diff] [blame] | 4194 | static void __mem_cgroup_free(struct mem_cgroup *memcg) |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4195 | { |
| 4196 | int node; |
| 4197 | |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4198 | for_each_node(node) |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 4199 | free_mem_cgroup_per_node_info(memcg, node); |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4200 | free_percpu(memcg->stat); |
| 4201 | kfree(memcg); |
| 4202 | } |
| 4203 | |
Tahsin Erdogan | 40e952f | 2017-03-09 16:17:26 -0800 | [diff] [blame] | 4204 | static void mem_cgroup_free(struct mem_cgroup *memcg) |
| 4205 | { |
| 4206 | memcg_wb_domain_exit(memcg); |
| 4207 | __mem_cgroup_free(memcg); |
| 4208 | } |
| 4209 | |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4210 | static struct mem_cgroup *mem_cgroup_alloc(void) |
| 4211 | { |
Hugh Dickins | d79154b | 2012-03-21 16:34:18 -0700 | [diff] [blame] | 4212 | struct mem_cgroup *memcg; |
Vladimir Davydov | 8ff69e2 | 2014-01-23 15:52:52 -0800 | [diff] [blame] | 4213 | size_t size; |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4214 | int node; |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4215 | |
Vladimir Davydov | 8ff69e2 | 2014-01-23 15:52:52 -0800 | [diff] [blame] | 4216 | size = sizeof(struct mem_cgroup); |
| 4217 | size += nr_node_ids * sizeof(struct mem_cgroup_per_node *); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 4218 | |
Vladimir Davydov | 8ff69e2 | 2014-01-23 15:52:52 -0800 | [diff] [blame] | 4219 | memcg = kzalloc(size, GFP_KERNEL); |
Hugh Dickins | d79154b | 2012-03-21 16:34:18 -0700 | [diff] [blame] | 4220 | if (!memcg) |
Dan Carpenter | e7bbcdf | 2010-03-23 13:35:12 -0700 | [diff] [blame] | 4221 | return NULL; |
| 4222 | |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4223 | memcg->id.id = idr_alloc(&mem_cgroup_idr, NULL, |
| 4224 | 1, MEM_CGROUP_ID_MAX, |
| 4225 | GFP_KERNEL); |
| 4226 | if (memcg->id.id < 0) |
| 4227 | goto fail; |
| 4228 | |
Hugh Dickins | d79154b | 2012-03-21 16:34:18 -0700 | [diff] [blame] | 4229 | memcg->stat = alloc_percpu(struct mem_cgroup_stat_cpu); |
| 4230 | if (!memcg->stat) |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4231 | goto fail; |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 4232 | |
Bob Liu | 3ed28fa | 2012-01-12 17:19:04 -0800 | [diff] [blame] | 4233 | for_each_node(node) |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 4234 | if (alloc_mem_cgroup_per_node_info(memcg, node)) |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4235 | goto fail; |
Balbir Singh | f64c3f5 | 2009-09-23 15:56:37 -0700 | [diff] [blame] | 4236 | |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4237 | if (memcg_wb_domain_init(memcg, GFP_KERNEL)) |
| 4238 | goto fail; |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 4239 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 4240 | INIT_WORK(&memcg->high_work, high_work_func); |
Glauber Costa | d142e3e | 2013-02-22 16:34:52 -0800 | [diff] [blame] | 4241 | memcg->last_scanned_node = MAX_NUMNODES; |
| 4242 | INIT_LIST_HEAD(&memcg->oom_notify); |
Glauber Costa | d142e3e | 2013-02-22 16:34:52 -0800 | [diff] [blame] | 4243 | mutex_init(&memcg->thresholds_lock); |
| 4244 | spin_lock_init(&memcg->move_lock); |
Anton Vorontsov | 70ddf63 | 2013-04-29 15:08:31 -0700 | [diff] [blame] | 4245 | vmpressure_init(&memcg->vmpressure); |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 4246 | INIT_LIST_HEAD(&memcg->event_list); |
| 4247 | spin_lock_init(&memcg->event_list_lock); |
Johannes Weiner | d886f4e | 2016-01-20 15:02:47 -0800 | [diff] [blame] | 4248 | memcg->socket_pressure = jiffies; |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 4249 | #ifndef CONFIG_SLOB |
Vladimir Davydov | 900a38f | 2014-12-12 16:55:10 -0800 | [diff] [blame] | 4250 | memcg->kmemcg_id = -1; |
Vladimir Davydov | 900a38f | 2014-12-12 16:55:10 -0800 | [diff] [blame] | 4251 | #endif |
Tejun Heo | 52ebea7 | 2015-05-22 17:13:37 -0400 | [diff] [blame] | 4252 | #ifdef CONFIG_CGROUP_WRITEBACK |
| 4253 | INIT_LIST_HEAD(&memcg->cgwb_list); |
| 4254 | #endif |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4255 | idr_replace(&mem_cgroup_idr, memcg, memcg->id.id); |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4256 | return memcg; |
| 4257 | fail: |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4258 | if (memcg->id.id > 0) |
| 4259 | idr_remove(&mem_cgroup_idr, memcg->id.id); |
Tahsin Erdogan | 40e952f | 2017-03-09 16:17:26 -0800 | [diff] [blame] | 4260 | __mem_cgroup_free(memcg); |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4261 | return NULL; |
Glauber Costa | d142e3e | 2013-02-22 16:34:52 -0800 | [diff] [blame] | 4262 | } |
| 4263 | |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4264 | static struct cgroup_subsys_state * __ref |
| 4265 | mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css) |
Glauber Costa | d142e3e | 2013-02-22 16:34:52 -0800 | [diff] [blame] | 4266 | { |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4267 | struct mem_cgroup *parent = mem_cgroup_from_css(parent_css); |
| 4268 | struct mem_cgroup *memcg; |
| 4269 | long error = -ENOMEM; |
Glauber Costa | d142e3e | 2013-02-22 16:34:52 -0800 | [diff] [blame] | 4270 | |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4271 | memcg = mem_cgroup_alloc(); |
| 4272 | if (!memcg) |
| 4273 | return ERR_PTR(error); |
Li Zefan | 4219b2d | 2013-09-23 16:56:29 +0800 | [diff] [blame] | 4274 | |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4275 | memcg->high = PAGE_COUNTER_MAX; |
| 4276 | memcg->soft_limit = PAGE_COUNTER_MAX; |
| 4277 | if (parent) { |
| 4278 | memcg->swappiness = mem_cgroup_swappiness(parent); |
| 4279 | memcg->oom_kill_disable = parent->oom_kill_disable; |
| 4280 | } |
| 4281 | if (parent && parent->use_hierarchy) { |
| 4282 | memcg->use_hierarchy = true; |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 4283 | page_counter_init(&memcg->memory, &parent->memory); |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 4284 | page_counter_init(&memcg->swap, &parent->swap); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 4285 | page_counter_init(&memcg->memsw, &parent->memsw); |
| 4286 | page_counter_init(&memcg->kmem, &parent->kmem); |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 4287 | page_counter_init(&memcg->tcpmem, &parent->tcpmem); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4288 | } else { |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 4289 | page_counter_init(&memcg->memory, NULL); |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 4290 | page_counter_init(&memcg->swap, NULL); |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 4291 | page_counter_init(&memcg->memsw, NULL); |
| 4292 | page_counter_init(&memcg->kmem, NULL); |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 4293 | page_counter_init(&memcg->tcpmem, NULL); |
Tejun Heo | 8c7f6ed | 2012-09-13 12:20:58 -0700 | [diff] [blame] | 4294 | /* |
| 4295 | * Deeper hierachy with use_hierarchy == false doesn't make |
| 4296 | * much sense so let cgroup subsystem know about this |
| 4297 | * unfortunate state in our controller. |
| 4298 | */ |
Glauber Costa | d142e3e | 2013-02-22 16:34:52 -0800 | [diff] [blame] | 4299 | if (parent != root_mem_cgroup) |
Tejun Heo | 073219e | 2014-02-08 10:36:58 -0500 | [diff] [blame] | 4300 | memory_cgrp_subsys.broken_hierarchy = true; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 4301 | } |
Vladimir Davydov | d644163 | 2014-01-23 15:53:09 -0800 | [diff] [blame] | 4302 | |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4303 | /* The following stuff does not apply to the root */ |
| 4304 | if (!parent) { |
| 4305 | root_mem_cgroup = memcg; |
| 4306 | return &memcg->css; |
| 4307 | } |
| 4308 | |
Vladimir Davydov | b313aee | 2016-03-17 14:18:27 -0700 | [diff] [blame] | 4309 | error = memcg_online_kmem(memcg); |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4310 | if (error) |
| 4311 | goto fail; |
Johannes Weiner | 127424c | 2016-01-20 15:02:32 -0800 | [diff] [blame] | 4312 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 4313 | if (cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_nosocket) |
Johannes Weiner | ef12947 | 2016-01-14 15:21:34 -0800 | [diff] [blame] | 4314 | static_branch_inc(&memcg_sockets_enabled_key); |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 4315 | |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4316 | return &memcg->css; |
| 4317 | fail: |
| 4318 | mem_cgroup_free(memcg); |
Tejun Heo | ea3a964 | 2016-06-24 14:49:58 -0700 | [diff] [blame] | 4319 | return ERR_PTR(-ENOMEM); |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4320 | } |
| 4321 | |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4322 | static int mem_cgroup_css_online(struct cgroup_subsys_state *css) |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4323 | { |
Vladimir Davydov | 58fa2a5 | 2016-10-07 16:57:29 -0700 | [diff] [blame] | 4324 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
| 4325 | |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4326 | /* Online state pins memcg ID, memcg ID pins CSS */ |
Vladimir Davydov | 58fa2a5 | 2016-10-07 16:57:29 -0700 | [diff] [blame] | 4327 | atomic_set(&memcg->id.ref, 1); |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4328 | css_get(css); |
Johannes Weiner | 2f7dd7a | 2014-10-02 16:16:57 -0700 | [diff] [blame] | 4329 | return 0; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4330 | } |
| 4331 | |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 4332 | static void mem_cgroup_css_offline(struct cgroup_subsys_state *css) |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 4333 | { |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 4334 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
Tejun Heo | 3bc942f | 2013-11-22 18:20:44 -0500 | [diff] [blame] | 4335 | struct mem_cgroup_event *event, *tmp; |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 4336 | |
| 4337 | /* |
| 4338 | * Unregister events and notify userspace. |
| 4339 | * Notify userspace about cgroup removing only after rmdir of cgroup |
| 4340 | * directory to avoid race between userspace and kernelspace. |
| 4341 | */ |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 4342 | spin_lock(&memcg->event_list_lock); |
| 4343 | list_for_each_entry_safe(event, tmp, &memcg->event_list, list) { |
Tejun Heo | 79bd981 | 2013-11-22 18:20:42 -0500 | [diff] [blame] | 4344 | list_del_init(&event->list); |
| 4345 | schedule_work(&event->remove); |
| 4346 | } |
Tejun Heo | fba9480 | 2013-11-22 18:20:43 -0500 | [diff] [blame] | 4347 | spin_unlock(&memcg->event_list_lock); |
KAMEZAWA Hiroyuki | ec64f51 | 2009-04-02 16:57:26 -0700 | [diff] [blame] | 4348 | |
Roman Gushchin | 63677c74 | 2017-09-06 16:21:47 -0700 | [diff] [blame] | 4349 | memcg->low = 0; |
| 4350 | |
Johannes Weiner | 567e9ab | 2016-01-20 15:02:24 -0800 | [diff] [blame] | 4351 | memcg_offline_kmem(memcg); |
Tejun Heo | 52ebea7 | 2015-05-22 17:13:37 -0400 | [diff] [blame] | 4352 | wb_memcg_offline(memcg); |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 4353 | |
| 4354 | mem_cgroup_id_put(memcg); |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 4355 | } |
| 4356 | |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 4357 | static void mem_cgroup_css_released(struct cgroup_subsys_state *css) |
| 4358 | { |
| 4359 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
| 4360 | |
| 4361 | invalidate_reclaim_iterators(memcg); |
| 4362 | } |
| 4363 | |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 4364 | static void mem_cgroup_css_free(struct cgroup_subsys_state *css) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4365 | { |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 4366 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
Daisuke Nishimura | c268e99 | 2009-01-15 13:51:13 -0800 | [diff] [blame] | 4367 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 4368 | if (cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_nosocket) |
Johannes Weiner | ef12947 | 2016-01-14 15:21:34 -0800 | [diff] [blame] | 4369 | static_branch_dec(&memcg_sockets_enabled_key); |
Johannes Weiner | 3893e30 | 2016-01-20 15:02:29 -0800 | [diff] [blame] | 4370 | |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 4371 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && memcg->tcpmem_active) |
Vladimir Davydov | d55f90b | 2016-01-20 15:02:44 -0800 | [diff] [blame] | 4372 | static_branch_dec(&memcg_sockets_enabled_key); |
Johannes Weiner | 3893e30 | 2016-01-20 15:02:29 -0800 | [diff] [blame] | 4373 | |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4374 | vmpressure_cleanup(&memcg->vmpressure); |
| 4375 | cancel_work_sync(&memcg->high_work); |
| 4376 | mem_cgroup_remove_from_trees(memcg); |
Johannes Weiner | d886f4e | 2016-01-20 15:02:47 -0800 | [diff] [blame] | 4377 | memcg_free_kmem(memcg); |
Johannes Weiner | 0b8f73e | 2016-01-20 15:02:53 -0800 | [diff] [blame] | 4378 | mem_cgroup_free(memcg); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 4379 | } |
| 4380 | |
Tejun Heo | 1ced953 | 2014-07-08 18:02:57 -0400 | [diff] [blame] | 4381 | /** |
| 4382 | * mem_cgroup_css_reset - reset the states of a mem_cgroup |
| 4383 | * @css: the target css |
| 4384 | * |
| 4385 | * Reset the states of the mem_cgroup associated with @css. This is |
| 4386 | * invoked when the userland requests disabling on the default hierarchy |
| 4387 | * but the memcg is pinned through dependency. The memcg should stop |
| 4388 | * applying policies and should revert to the vanilla state as it may be |
| 4389 | * made visible again. |
| 4390 | * |
| 4391 | * The current implementation only resets the essential configurations. |
| 4392 | * This needs to be expanded to cover all the visible parts. |
| 4393 | */ |
| 4394 | static void mem_cgroup_css_reset(struct cgroup_subsys_state *css) |
| 4395 | { |
| 4396 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
| 4397 | |
Vladimir Davydov | d334c9bc | 2016-03-17 14:19:38 -0700 | [diff] [blame] | 4398 | page_counter_limit(&memcg->memory, PAGE_COUNTER_MAX); |
| 4399 | page_counter_limit(&memcg->swap, PAGE_COUNTER_MAX); |
| 4400 | page_counter_limit(&memcg->memsw, PAGE_COUNTER_MAX); |
| 4401 | page_counter_limit(&memcg->kmem, PAGE_COUNTER_MAX); |
| 4402 | page_counter_limit(&memcg->tcpmem, PAGE_COUNTER_MAX); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 4403 | memcg->low = 0; |
| 4404 | memcg->high = PAGE_COUNTER_MAX; |
Johannes Weiner | 24d404d | 2015-01-08 14:32:35 -0800 | [diff] [blame] | 4405 | memcg->soft_limit = PAGE_COUNTER_MAX; |
Tejun Heo | 2529bb3 | 2015-05-22 18:23:34 -0400 | [diff] [blame] | 4406 | memcg_wb_domain_size_changed(memcg); |
Tejun Heo | 1ced953 | 2014-07-08 18:02:57 -0400 | [diff] [blame] | 4407 | } |
| 4408 | |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4409 | #ifdef CONFIG_MMU |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4410 | /* Handlers for move charge at task migration. */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4411 | static int mem_cgroup_do_precharge(unsigned long count) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4412 | { |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 4413 | int ret; |
Johannes Weiner | 9476db9 | 2014-08-06 16:05:55 -0700 | [diff] [blame] | 4414 | |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 4415 | /* Try a single bulk charge without reclaim first, kswapd may wake */ |
| 4416 | ret = try_charge(mc.to, GFP_KERNEL & ~__GFP_DIRECT_RECLAIM, count); |
Johannes Weiner | 9476db9 | 2014-08-06 16:05:55 -0700 | [diff] [blame] | 4417 | if (!ret) { |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4418 | mc.precharge += count; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4419 | return ret; |
| 4420 | } |
Johannes Weiner | 9476db9 | 2014-08-06 16:05:55 -0700 | [diff] [blame] | 4421 | |
David Rientjes | 3674534 | 2017-01-24 15:18:10 -0800 | [diff] [blame] | 4422 | /* Try charges one by one with reclaim, but do not retry */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4423 | while (count--) { |
David Rientjes | 3674534 | 2017-01-24 15:18:10 -0800 | [diff] [blame] | 4424 | ret = try_charge(mc.to, GFP_KERNEL | __GFP_NORETRY, 1); |
KAMEZAWA Hiroyuki | 38c5d72 | 2012-01-12 17:19:01 -0800 | [diff] [blame] | 4425 | if (ret) |
KAMEZAWA Hiroyuki | 38c5d72 | 2012-01-12 17:19:01 -0800 | [diff] [blame] | 4426 | return ret; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4427 | mc.precharge++; |
Johannes Weiner | 9476db9 | 2014-08-06 16:05:55 -0700 | [diff] [blame] | 4428 | cond_resched(); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4429 | } |
Johannes Weiner | 9476db9 | 2014-08-06 16:05:55 -0700 | [diff] [blame] | 4430 | return 0; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4431 | } |
| 4432 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4433 | union mc_target { |
| 4434 | struct page *page; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4435 | swp_entry_t ent; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4436 | }; |
| 4437 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4438 | enum mc_target_type { |
Naoya Horiguchi | 8d32ff8 | 2012-03-21 16:34:27 -0700 | [diff] [blame] | 4439 | MC_TARGET_NONE = 0, |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4440 | MC_TARGET_PAGE, |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4441 | MC_TARGET_SWAP, |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 4442 | MC_TARGET_DEVICE, |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4443 | }; |
| 4444 | |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4445 | static struct page *mc_handle_present_pte(struct vm_area_struct *vma, |
| 4446 | unsigned long addr, pte_t ptent) |
| 4447 | { |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 4448 | struct page *page = _vm_normal_page(vma, addr, ptent, true); |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4449 | |
| 4450 | if (!page || !page_mapped(page)) |
| 4451 | return NULL; |
| 4452 | if (PageAnon(page)) { |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 4453 | if (!(mc.flags & MOVE_ANON)) |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4454 | return NULL; |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 4455 | } else { |
| 4456 | if (!(mc.flags & MOVE_FILE)) |
| 4457 | return NULL; |
| 4458 | } |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4459 | if (!get_page_unless_zero(page)) |
| 4460 | return NULL; |
| 4461 | |
| 4462 | return page; |
| 4463 | } |
| 4464 | |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 4465 | #if defined(CONFIG_SWAP) || defined(CONFIG_DEVICE_PRIVATE) |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4466 | static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, |
Li RongQing | 48406ef | 2016-07-26 15:22:14 -0700 | [diff] [blame] | 4467 | pte_t ptent, swp_entry_t *entry) |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4468 | { |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4469 | struct page *page = NULL; |
| 4470 | swp_entry_t ent = pte_to_swp_entry(ptent); |
| 4471 | |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 4472 | if (!(mc.flags & MOVE_ANON) || non_swap_entry(ent)) |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4473 | return NULL; |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 4474 | |
| 4475 | /* |
| 4476 | * Handle MEMORY_DEVICE_PRIVATE which are ZONE_DEVICE page belonging to |
| 4477 | * a device and because they are not accessible by CPU they are store |
| 4478 | * as special swap entry in the CPU page table. |
| 4479 | */ |
| 4480 | if (is_device_private_entry(ent)) { |
| 4481 | page = device_private_entry_to_page(ent); |
| 4482 | /* |
| 4483 | * MEMORY_DEVICE_PRIVATE means ZONE_DEVICE page and which have |
| 4484 | * a refcount of 1 when free (unlike normal page) |
| 4485 | */ |
| 4486 | if (!page_ref_add_unless(page, 1, 1)) |
| 4487 | return NULL; |
| 4488 | return page; |
| 4489 | } |
| 4490 | |
KAMEZAWA Hiroyuki | 4b91355 | 2012-05-29 15:06:51 -0700 | [diff] [blame] | 4491 | /* |
| 4492 | * Because lookup_swap_cache() updates some statistics counter, |
| 4493 | * we call find_get_page() with swapper_space directly. |
| 4494 | */ |
Huang Ying | f6ab1f7 | 2016-10-07 17:00:21 -0700 | [diff] [blame] | 4495 | page = find_get_page(swap_address_space(ent), swp_offset(ent)); |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 4496 | if (do_memsw_account()) |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4497 | entry->val = ent.val; |
| 4498 | |
| 4499 | return page; |
| 4500 | } |
KAMEZAWA Hiroyuki | 4b91355 | 2012-05-29 15:06:51 -0700 | [diff] [blame] | 4501 | #else |
| 4502 | static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, |
Li RongQing | 48406ef | 2016-07-26 15:22:14 -0700 | [diff] [blame] | 4503 | pte_t ptent, swp_entry_t *entry) |
KAMEZAWA Hiroyuki | 4b91355 | 2012-05-29 15:06:51 -0700 | [diff] [blame] | 4504 | { |
| 4505 | return NULL; |
| 4506 | } |
| 4507 | #endif |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4508 | |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4509 | static struct page *mc_handle_file_pte(struct vm_area_struct *vma, |
| 4510 | unsigned long addr, pte_t ptent, swp_entry_t *entry) |
| 4511 | { |
| 4512 | struct page *page = NULL; |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4513 | struct address_space *mapping; |
| 4514 | pgoff_t pgoff; |
| 4515 | |
| 4516 | if (!vma->vm_file) /* anonymous vma */ |
| 4517 | return NULL; |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 4518 | if (!(mc.flags & MOVE_FILE)) |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4519 | return NULL; |
| 4520 | |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4521 | mapping = vma->vm_file->f_mapping; |
Kirill A. Shutemov | 0661a33 | 2015-02-10 14:10:04 -0800 | [diff] [blame] | 4522 | pgoff = linear_page_index(vma, addr); |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4523 | |
| 4524 | /* page is moved even if it's not RSS of this task(page-faulted). */ |
Hugh Dickins | aa3b189 | 2011-08-03 16:21:24 -0700 | [diff] [blame] | 4525 | #ifdef CONFIG_SWAP |
| 4526 | /* shmem/tmpfs may report page out on swap: account for that too. */ |
Johannes Weiner | 139b6a6 | 2014-05-06 12:50:05 -0700 | [diff] [blame] | 4527 | if (shmem_mapping(mapping)) { |
| 4528 | page = find_get_entry(mapping, pgoff); |
| 4529 | if (radix_tree_exceptional_entry(page)) { |
| 4530 | swp_entry_t swp = radix_to_swp_entry(page); |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 4531 | if (do_memsw_account()) |
Johannes Weiner | 139b6a6 | 2014-05-06 12:50:05 -0700 | [diff] [blame] | 4532 | *entry = swp; |
Huang Ying | f6ab1f7 | 2016-10-07 17:00:21 -0700 | [diff] [blame] | 4533 | page = find_get_page(swap_address_space(swp), |
| 4534 | swp_offset(swp)); |
Johannes Weiner | 139b6a6 | 2014-05-06 12:50:05 -0700 | [diff] [blame] | 4535 | } |
| 4536 | } else |
| 4537 | page = find_get_page(mapping, pgoff); |
| 4538 | #else |
| 4539 | page = find_get_page(mapping, pgoff); |
Hugh Dickins | aa3b189 | 2011-08-03 16:21:24 -0700 | [diff] [blame] | 4540 | #endif |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4541 | return page; |
| 4542 | } |
| 4543 | |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4544 | /** |
| 4545 | * mem_cgroup_move_account - move account of the page |
| 4546 | * @page: the page |
Li RongQing | 25843c2 | 2016-07-26 15:26:56 -0700 | [diff] [blame] | 4547 | * @compound: charge the page as compound or small page |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4548 | * @from: mem_cgroup which the page is moved from. |
| 4549 | * @to: mem_cgroup which the page is moved to. @from != @to. |
| 4550 | * |
Kirill A. Shutemov | 3ac808f | 2016-01-15 16:53:07 -0800 | [diff] [blame] | 4551 | * The caller must make sure the page is not on LRU (isolate_page() is useful.) |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4552 | * |
| 4553 | * This function doesn't do "charge" to new cgroup and doesn't do "uncharge" |
| 4554 | * from old cgroup. |
| 4555 | */ |
| 4556 | static int mem_cgroup_move_account(struct page *page, |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 4557 | bool compound, |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4558 | struct mem_cgroup *from, |
| 4559 | struct mem_cgroup *to) |
| 4560 | { |
| 4561 | unsigned long flags; |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 4562 | unsigned int nr_pages = compound ? hpage_nr_pages(page) : 1; |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4563 | int ret; |
Greg Thelen | c4843a7 | 2015-05-22 17:13:16 -0400 | [diff] [blame] | 4564 | bool anon; |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4565 | |
| 4566 | VM_BUG_ON(from == to); |
| 4567 | VM_BUG_ON_PAGE(PageLRU(page), page); |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 4568 | VM_BUG_ON(compound && !PageTransHuge(page)); |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4569 | |
| 4570 | /* |
Johannes Weiner | 6a93ca8 | 2016-03-15 14:57:19 -0700 | [diff] [blame] | 4571 | * Prevent mem_cgroup_migrate() from looking at |
Hugh Dickins | 45637ba | 2015-11-05 18:49:40 -0800 | [diff] [blame] | 4572 | * page->mem_cgroup of its source page while we change it. |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4573 | */ |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 4574 | ret = -EBUSY; |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4575 | if (!trylock_page(page)) |
| 4576 | goto out; |
| 4577 | |
| 4578 | ret = -EINVAL; |
| 4579 | if (page->mem_cgroup != from) |
| 4580 | goto out_unlock; |
| 4581 | |
Greg Thelen | c4843a7 | 2015-05-22 17:13:16 -0400 | [diff] [blame] | 4582 | anon = PageAnon(page); |
| 4583 | |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4584 | spin_lock_irqsave(&from->move_lock, flags); |
| 4585 | |
Greg Thelen | c4843a7 | 2015-05-22 17:13:16 -0400 | [diff] [blame] | 4586 | if (!anon && page_mapped(page)) { |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 4587 | __this_cpu_sub(from->stat->count[NR_FILE_MAPPED], nr_pages); |
| 4588 | __this_cpu_add(to->stat->count[NR_FILE_MAPPED], nr_pages); |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4589 | } |
| 4590 | |
Greg Thelen | c4843a7 | 2015-05-22 17:13:16 -0400 | [diff] [blame] | 4591 | /* |
| 4592 | * move_lock grabbed above and caller set from->moving_account, so |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 4593 | * mod_memcg_page_state will serialize updates to PageDirty. |
Greg Thelen | c4843a7 | 2015-05-22 17:13:16 -0400 | [diff] [blame] | 4594 | * So mapping should be stable for dirty pages. |
| 4595 | */ |
| 4596 | if (!anon && PageDirty(page)) { |
| 4597 | struct address_space *mapping = page_mapping(page); |
| 4598 | |
| 4599 | if (mapping_cap_account_dirty(mapping)) { |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 4600 | __this_cpu_sub(from->stat->count[NR_FILE_DIRTY], |
Greg Thelen | c4843a7 | 2015-05-22 17:13:16 -0400 | [diff] [blame] | 4601 | nr_pages); |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 4602 | __this_cpu_add(to->stat->count[NR_FILE_DIRTY], |
Greg Thelen | c4843a7 | 2015-05-22 17:13:16 -0400 | [diff] [blame] | 4603 | nr_pages); |
| 4604 | } |
| 4605 | } |
| 4606 | |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4607 | if (PageWriteback(page)) { |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 4608 | __this_cpu_sub(from->stat->count[NR_WRITEBACK], nr_pages); |
| 4609 | __this_cpu_add(to->stat->count[NR_WRITEBACK], nr_pages); |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4610 | } |
| 4611 | |
| 4612 | /* |
| 4613 | * It is safe to change page->mem_cgroup here because the page |
| 4614 | * is referenced, charged, and isolated - we can't race with |
| 4615 | * uncharging, charging, migration, or LRU putback. |
| 4616 | */ |
| 4617 | |
| 4618 | /* caller should have done css_get */ |
| 4619 | page->mem_cgroup = to; |
| 4620 | spin_unlock_irqrestore(&from->move_lock, flags); |
| 4621 | |
| 4622 | ret = 0; |
| 4623 | |
| 4624 | local_irq_disable(); |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 4625 | mem_cgroup_charge_statistics(to, page, compound, nr_pages); |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4626 | memcg_check_events(to, page); |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 4627 | mem_cgroup_charge_statistics(from, page, compound, -nr_pages); |
Chen Gang | b1b0dea | 2015-04-14 15:47:35 -0700 | [diff] [blame] | 4628 | memcg_check_events(from, page); |
| 4629 | local_irq_enable(); |
| 4630 | out_unlock: |
| 4631 | unlock_page(page); |
| 4632 | out: |
| 4633 | return ret; |
| 4634 | } |
| 4635 | |
Li RongQing | 7cf7806 | 2016-05-27 14:27:46 -0700 | [diff] [blame] | 4636 | /** |
| 4637 | * get_mctgt_type - get target type of moving charge |
| 4638 | * @vma: the vma the pte to be checked belongs |
| 4639 | * @addr: the address corresponding to the pte to be checked |
| 4640 | * @ptent: the pte to be checked |
| 4641 | * @target: the pointer the target page or swap ent will be stored(can be NULL) |
| 4642 | * |
| 4643 | * Returns |
| 4644 | * 0(MC_TARGET_NONE): if the pte is not a target for move charge. |
| 4645 | * 1(MC_TARGET_PAGE): if the page corresponding to this pte is a target for |
| 4646 | * move charge. if @target is not NULL, the page is stored in target->page |
| 4647 | * with extra refcnt got(Callers should handle it). |
| 4648 | * 2(MC_TARGET_SWAP): if the swap entry corresponding to this pte is a |
| 4649 | * target for charge migration. if @target is not NULL, the entry is stored |
| 4650 | * in target->ent. |
Jérôme Glisse | df6ad69 | 2017-09-08 16:12:24 -0700 | [diff] [blame] | 4651 | * 3(MC_TARGET_DEVICE): like MC_TARGET_PAGE but page is MEMORY_DEVICE_PUBLIC |
| 4652 | * or MEMORY_DEVICE_PRIVATE (so ZONE_DEVICE page and thus not on the lru). |
| 4653 | * For now we such page is charge like a regular page would be as for all |
| 4654 | * intent and purposes it is just special memory taking the place of a |
| 4655 | * regular page. |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 4656 | * |
| 4657 | * See Documentations/vm/hmm.txt and include/linux/hmm.h |
Li RongQing | 7cf7806 | 2016-05-27 14:27:46 -0700 | [diff] [blame] | 4658 | * |
| 4659 | * Called with pte lock held. |
| 4660 | */ |
| 4661 | |
Naoya Horiguchi | 8d32ff8 | 2012-03-21 16:34:27 -0700 | [diff] [blame] | 4662 | static enum mc_target_type get_mctgt_type(struct vm_area_struct *vma, |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4663 | unsigned long addr, pte_t ptent, union mc_target *target) |
| 4664 | { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4665 | struct page *page = NULL; |
Naoya Horiguchi | 8d32ff8 | 2012-03-21 16:34:27 -0700 | [diff] [blame] | 4666 | enum mc_target_type ret = MC_TARGET_NONE; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4667 | swp_entry_t ent = { .val = 0 }; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4668 | |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4669 | if (pte_present(ptent)) |
| 4670 | page = mc_handle_present_pte(vma, addr, ptent); |
| 4671 | else if (is_swap_pte(ptent)) |
Li RongQing | 48406ef | 2016-07-26 15:22:14 -0700 | [diff] [blame] | 4672 | page = mc_handle_swap_pte(vma, ptent, &ent); |
Kirill A. Shutemov | 0661a33 | 2015-02-10 14:10:04 -0800 | [diff] [blame] | 4673 | else if (pte_none(ptent)) |
Daisuke Nishimura | 87946a7 | 2010-05-26 14:42:39 -0700 | [diff] [blame] | 4674 | page = mc_handle_file_pte(vma, addr, ptent, &ent); |
Daisuke Nishimura | 90254a6 | 2010-05-26 14:42:38 -0700 | [diff] [blame] | 4675 | |
| 4676 | if (!page && !ent.val) |
Naoya Horiguchi | 8d32ff8 | 2012-03-21 16:34:27 -0700 | [diff] [blame] | 4677 | return ret; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4678 | if (page) { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4679 | /* |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 4680 | * Do only loose check w/o serialization. |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 4681 | * mem_cgroup_move_account() checks the page is valid or |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 4682 | * not under LRU exclusion. |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4683 | */ |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 4684 | if (page->mem_cgroup == mc.from) { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4685 | ret = MC_TARGET_PAGE; |
Jérôme Glisse | df6ad69 | 2017-09-08 16:12:24 -0700 | [diff] [blame] | 4686 | if (is_device_private_page(page) || |
| 4687 | is_device_public_page(page)) |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 4688 | ret = MC_TARGET_DEVICE; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4689 | if (target) |
| 4690 | target->page = page; |
| 4691 | } |
| 4692 | if (!ret || !target) |
| 4693 | put_page(page); |
| 4694 | } |
Huang Ying | 3e14a57 | 2017-09-06 16:22:37 -0700 | [diff] [blame] | 4695 | /* |
| 4696 | * There is a swap entry and a page doesn't exist or isn't charged. |
| 4697 | * But we cannot move a tail-page in a THP. |
| 4698 | */ |
| 4699 | if (ent.val && !ret && (!page || !PageTransCompound(page)) && |
Li Zefan | 34c00c3 | 2013-09-23 16:56:01 +0800 | [diff] [blame] | 4700 | mem_cgroup_id(mc.from) == lookup_swap_cgroup_id(ent)) { |
KAMEZAWA Hiroyuki | 7f0f154 | 2010-05-11 14:06:58 -0700 | [diff] [blame] | 4701 | ret = MC_TARGET_SWAP; |
| 4702 | if (target) |
| 4703 | target->ent = ent; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4704 | } |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4705 | return ret; |
| 4706 | } |
| 4707 | |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4708 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 4709 | /* |
Huang Ying | d6810d7 | 2017-09-06 16:22:45 -0700 | [diff] [blame] | 4710 | * We don't consider PMD mapped swapping or file mapped pages because THP does |
| 4711 | * not support them for now. |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4712 | * Caller should make sure that pmd_trans_huge(pmd) is true. |
| 4713 | */ |
| 4714 | static enum mc_target_type get_mctgt_type_thp(struct vm_area_struct *vma, |
| 4715 | unsigned long addr, pmd_t pmd, union mc_target *target) |
| 4716 | { |
| 4717 | struct page *page = NULL; |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4718 | enum mc_target_type ret = MC_TARGET_NONE; |
| 4719 | |
Zi Yan | 84c3fc4 | 2017-09-08 16:11:01 -0700 | [diff] [blame] | 4720 | if (unlikely(is_swap_pmd(pmd))) { |
| 4721 | VM_BUG_ON(thp_migration_supported() && |
| 4722 | !is_pmd_migration_entry(pmd)); |
| 4723 | return ret; |
| 4724 | } |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4725 | page = pmd_page(pmd); |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 4726 | VM_BUG_ON_PAGE(!page || !PageHead(page), page); |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 4727 | if (!(mc.flags & MOVE_ANON)) |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4728 | return ret; |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 4729 | if (page->mem_cgroup == mc.from) { |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4730 | ret = MC_TARGET_PAGE; |
| 4731 | if (target) { |
| 4732 | get_page(page); |
| 4733 | target->page = page; |
| 4734 | } |
| 4735 | } |
| 4736 | return ret; |
| 4737 | } |
| 4738 | #else |
| 4739 | static inline enum mc_target_type get_mctgt_type_thp(struct vm_area_struct *vma, |
| 4740 | unsigned long addr, pmd_t pmd, union mc_target *target) |
| 4741 | { |
| 4742 | return MC_TARGET_NONE; |
| 4743 | } |
| 4744 | #endif |
| 4745 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4746 | static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd, |
| 4747 | unsigned long addr, unsigned long end, |
| 4748 | struct mm_walk *walk) |
| 4749 | { |
Naoya Horiguchi | 26bcd64 | 2015-02-11 15:27:57 -0800 | [diff] [blame] | 4750 | struct vm_area_struct *vma = walk->vma; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4751 | pte_t *pte; |
| 4752 | spinlock_t *ptl; |
| 4753 | |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 4754 | ptl = pmd_trans_huge_lock(pmd, vma); |
| 4755 | if (ptl) { |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 4756 | /* |
| 4757 | * Note their can not be MC_TARGET_DEVICE for now as we do not |
| 4758 | * support transparent huge page with MEMORY_DEVICE_PUBLIC or |
| 4759 | * MEMORY_DEVICE_PRIVATE but this might change. |
| 4760 | */ |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4761 | if (get_mctgt_type_thp(vma, addr, *pmd, NULL) == MC_TARGET_PAGE) |
| 4762 | mc.precharge += HPAGE_PMD_NR; |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 4763 | spin_unlock(ptl); |
Andrea Arcangeli | 1a5a990 | 2012-03-21 16:33:42 -0700 | [diff] [blame] | 4764 | return 0; |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4765 | } |
Dave Hansen | 0331932 | 2011-03-22 16:32:56 -0700 | [diff] [blame] | 4766 | |
Andrea Arcangeli | 45f83ce | 2012-03-28 14:42:40 -0700 | [diff] [blame] | 4767 | if (pmd_trans_unstable(pmd)) |
| 4768 | return 0; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4769 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
| 4770 | for (; addr != end; pte++, addr += PAGE_SIZE) |
Naoya Horiguchi | 8d32ff8 | 2012-03-21 16:34:27 -0700 | [diff] [blame] | 4771 | if (get_mctgt_type(vma, addr, *pte, NULL)) |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4772 | mc.precharge++; /* increment precharge temporarily */ |
| 4773 | pte_unmap_unlock(pte - 1, ptl); |
| 4774 | cond_resched(); |
| 4775 | |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4776 | return 0; |
| 4777 | } |
| 4778 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4779 | static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm) |
| 4780 | { |
| 4781 | unsigned long precharge; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4782 | |
Naoya Horiguchi | 26bcd64 | 2015-02-11 15:27:57 -0800 | [diff] [blame] | 4783 | struct mm_walk mem_cgroup_count_precharge_walk = { |
| 4784 | .pmd_entry = mem_cgroup_count_precharge_pte_range, |
| 4785 | .mm = mm, |
| 4786 | }; |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4787 | down_read(&mm->mmap_sem); |
James Morse | 0247f3f | 2016-10-07 17:00:12 -0700 | [diff] [blame] | 4788 | walk_page_range(0, mm->highest_vm_end, |
| 4789 | &mem_cgroup_count_precharge_walk); |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4790 | up_read(&mm->mmap_sem); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4791 | |
| 4792 | precharge = mc.precharge; |
| 4793 | mc.precharge = 0; |
| 4794 | |
| 4795 | return precharge; |
| 4796 | } |
| 4797 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4798 | static int mem_cgroup_precharge_mc(struct mm_struct *mm) |
| 4799 | { |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4800 | unsigned long precharge = mem_cgroup_count_precharge(mm); |
| 4801 | |
| 4802 | VM_BUG_ON(mc.moving_task); |
| 4803 | mc.moving_task = current; |
| 4804 | return mem_cgroup_do_precharge(precharge); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4805 | } |
| 4806 | |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4807 | /* cancels all extra charges on mc.from and mc.to, and wakes up all waiters. */ |
| 4808 | static void __mem_cgroup_clear_mc(void) |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4809 | { |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 4810 | struct mem_cgroup *from = mc.from; |
| 4811 | struct mem_cgroup *to = mc.to; |
| 4812 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4813 | /* we must uncharge all the leftover precharges from mc.to */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4814 | if (mc.precharge) { |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 4815 | cancel_charge(mc.to, mc.precharge); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4816 | mc.precharge = 0; |
| 4817 | } |
| 4818 | /* |
| 4819 | * we didn't uncharge from mc.from at mem_cgroup_move_account(), so |
| 4820 | * we must uncharge here. |
| 4821 | */ |
| 4822 | if (mc.moved_charge) { |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 4823 | cancel_charge(mc.from, mc.moved_charge); |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 4824 | mc.moved_charge = 0; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4825 | } |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4826 | /* we must fixup refcnts and charges */ |
| 4827 | if (mc.moved_swap) { |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4828 | /* uncharge swap account from the old cgroup */ |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 4829 | if (!mem_cgroup_is_root(mc.from)) |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 4830 | page_counter_uncharge(&mc.from->memsw, mc.moved_swap); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4831 | |
Vladimir Davydov | 615d66c | 2016-08-11 15:33:03 -0700 | [diff] [blame] | 4832 | mem_cgroup_id_put_many(mc.from, mc.moved_swap); |
| 4833 | |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 4834 | /* |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 4835 | * we charged both to->memory and to->memsw, so we |
| 4836 | * should uncharge to->memory. |
Johannes Weiner | 05b8430 | 2014-08-06 16:05:59 -0700 | [diff] [blame] | 4837 | */ |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 4838 | if (!mem_cgroup_is_root(mc.to)) |
Johannes Weiner | 3e32cb2 | 2014-12-10 15:42:31 -0800 | [diff] [blame] | 4839 | page_counter_uncharge(&mc.to->memory, mc.moved_swap); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4840 | |
Vladimir Davydov | 615d66c | 2016-08-11 15:33:03 -0700 | [diff] [blame] | 4841 | mem_cgroup_id_get_many(mc.to, mc.moved_swap); |
| 4842 | css_put_many(&mc.to->css, mc.moved_swap); |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4843 | |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 4844 | mc.moved_swap = 0; |
| 4845 | } |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4846 | memcg_oom_recover(from); |
| 4847 | memcg_oom_recover(to); |
| 4848 | wake_up_all(&mc.waitq); |
| 4849 | } |
| 4850 | |
| 4851 | static void mem_cgroup_clear_mc(void) |
| 4852 | { |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 4853 | struct mm_struct *mm = mc.mm; |
| 4854 | |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 4855 | /* |
| 4856 | * we must clear moving_task before waking up waiters at the end of |
| 4857 | * task migration. |
| 4858 | */ |
| 4859 | mc.moving_task = NULL; |
| 4860 | __mem_cgroup_clear_mc(); |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 4861 | spin_lock(&mc.lock); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4862 | mc.from = NULL; |
| 4863 | mc.to = NULL; |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 4864 | mc.mm = NULL; |
KAMEZAWA Hiroyuki | 2bd9bb2 | 2010-08-10 18:02:58 -0700 | [diff] [blame] | 4865 | spin_unlock(&mc.lock); |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 4866 | |
| 4867 | mmput(mm); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4868 | } |
| 4869 | |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 4870 | static int mem_cgroup_can_attach(struct cgroup_taskset *tset) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4871 | { |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 4872 | struct cgroup_subsys_state *css; |
Ross Zwisler | eed67d7 | 2015-12-23 14:53:27 -0700 | [diff] [blame] | 4873 | struct mem_cgroup *memcg = NULL; /* unneeded init to make gcc happy */ |
Tejun Heo | 9f2115f | 2015-09-08 15:01:10 -0700 | [diff] [blame] | 4874 | struct mem_cgroup *from; |
Tejun Heo | 4530edd | 2015-09-11 15:00:19 -0400 | [diff] [blame] | 4875 | struct task_struct *leader, *p; |
Tejun Heo | 9f2115f | 2015-09-08 15:01:10 -0700 | [diff] [blame] | 4876 | struct mm_struct *mm; |
Johannes Weiner | 1dfab5a | 2015-02-11 15:26:09 -0800 | [diff] [blame] | 4877 | unsigned long move_flags; |
Tejun Heo | 9f2115f | 2015-09-08 15:01:10 -0700 | [diff] [blame] | 4878 | int ret = 0; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4879 | |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 4880 | /* charge immigration isn't supported on the default hierarchy */ |
| 4881 | if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
Tejun Heo | 9f2115f | 2015-09-08 15:01:10 -0700 | [diff] [blame] | 4882 | return 0; |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4883 | |
Tejun Heo | 4530edd | 2015-09-11 15:00:19 -0400 | [diff] [blame] | 4884 | /* |
| 4885 | * Multi-process migrations only happen on the default hierarchy |
| 4886 | * where charge immigration is not used. Perform charge |
| 4887 | * immigration if @tset contains a leader and whine if there are |
| 4888 | * multiple. |
| 4889 | */ |
| 4890 | p = NULL; |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 4891 | cgroup_taskset_for_each_leader(leader, css, tset) { |
Tejun Heo | 4530edd | 2015-09-11 15:00:19 -0400 | [diff] [blame] | 4892 | WARN_ON_ONCE(p); |
| 4893 | p = leader; |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 4894 | memcg = mem_cgroup_from_css(css); |
Tejun Heo | 4530edd | 2015-09-11 15:00:19 -0400 | [diff] [blame] | 4895 | } |
| 4896 | if (!p) |
| 4897 | return 0; |
| 4898 | |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 4899 | /* |
| 4900 | * We are now commited to this value whatever it is. Changes in this |
| 4901 | * tunable will only affect upcoming migrations, not the current one. |
| 4902 | * So we need to save it, and keep it going. |
| 4903 | */ |
| 4904 | move_flags = READ_ONCE(memcg->move_charge_at_immigrate); |
| 4905 | if (!move_flags) |
| 4906 | return 0; |
| 4907 | |
Tejun Heo | 9f2115f | 2015-09-08 15:01:10 -0700 | [diff] [blame] | 4908 | from = mem_cgroup_from_task(p); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4909 | |
Tejun Heo | 9f2115f | 2015-09-08 15:01:10 -0700 | [diff] [blame] | 4910 | VM_BUG_ON(from == memcg); |
Johannes Weiner | 247b144 | 2014-12-10 15:44:11 -0800 | [diff] [blame] | 4911 | |
Tejun Heo | 9f2115f | 2015-09-08 15:01:10 -0700 | [diff] [blame] | 4912 | mm = get_task_mm(p); |
| 4913 | if (!mm) |
| 4914 | return 0; |
| 4915 | /* We move charges only when we move a owner of the mm */ |
| 4916 | if (mm->owner == p) { |
| 4917 | VM_BUG_ON(mc.from); |
| 4918 | VM_BUG_ON(mc.to); |
| 4919 | VM_BUG_ON(mc.precharge); |
| 4920 | VM_BUG_ON(mc.moved_charge); |
| 4921 | VM_BUG_ON(mc.moved_swap); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4922 | |
Tejun Heo | 9f2115f | 2015-09-08 15:01:10 -0700 | [diff] [blame] | 4923 | spin_lock(&mc.lock); |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 4924 | mc.mm = mm; |
Tejun Heo | 9f2115f | 2015-09-08 15:01:10 -0700 | [diff] [blame] | 4925 | mc.from = from; |
| 4926 | mc.to = memcg; |
| 4927 | mc.flags = move_flags; |
| 4928 | spin_unlock(&mc.lock); |
| 4929 | /* We set mc.moving_task later */ |
| 4930 | |
| 4931 | ret = mem_cgroup_precharge_mc(mm); |
| 4932 | if (ret) |
| 4933 | mem_cgroup_clear_mc(); |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 4934 | } else { |
| 4935 | mmput(mm); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4936 | } |
| 4937 | return ret; |
| 4938 | } |
| 4939 | |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 4940 | static void mem_cgroup_cancel_attach(struct cgroup_taskset *tset) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4941 | { |
Johannes Weiner | 4e2f245 | 2014-12-10 15:44:08 -0800 | [diff] [blame] | 4942 | if (mc.to) |
| 4943 | mem_cgroup_clear_mc(); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4944 | } |
| 4945 | |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4946 | static int mem_cgroup_move_charge_pte_range(pmd_t *pmd, |
| 4947 | unsigned long addr, unsigned long end, |
| 4948 | struct mm_walk *walk) |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 4949 | { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4950 | int ret = 0; |
Naoya Horiguchi | 26bcd64 | 2015-02-11 15:27:57 -0800 | [diff] [blame] | 4951 | struct vm_area_struct *vma = walk->vma; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4952 | pte_t *pte; |
| 4953 | spinlock_t *ptl; |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4954 | enum mc_target_type target_type; |
| 4955 | union mc_target target; |
| 4956 | struct page *page; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4957 | |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 4958 | ptl = pmd_trans_huge_lock(pmd, vma); |
| 4959 | if (ptl) { |
Hugh Dickins | 62ade86 | 2012-05-18 11:28:34 -0700 | [diff] [blame] | 4960 | if (mc.precharge < HPAGE_PMD_NR) { |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 4961 | spin_unlock(ptl); |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4962 | return 0; |
| 4963 | } |
| 4964 | target_type = get_mctgt_type_thp(vma, addr, *pmd, &target); |
| 4965 | if (target_type == MC_TARGET_PAGE) { |
| 4966 | page = target.page; |
| 4967 | if (!isolate_lru_page(page)) { |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 4968 | if (!mem_cgroup_move_account(page, true, |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 4969 | mc.from, mc.to)) { |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4970 | mc.precharge -= HPAGE_PMD_NR; |
| 4971 | mc.moved_charge += HPAGE_PMD_NR; |
| 4972 | } |
| 4973 | putback_lru_page(page); |
| 4974 | } |
| 4975 | put_page(page); |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 4976 | } else if (target_type == MC_TARGET_DEVICE) { |
| 4977 | page = target.page; |
| 4978 | if (!mem_cgroup_move_account(page, true, |
| 4979 | mc.from, mc.to)) { |
| 4980 | mc.precharge -= HPAGE_PMD_NR; |
| 4981 | mc.moved_charge += HPAGE_PMD_NR; |
| 4982 | } |
| 4983 | put_page(page); |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4984 | } |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 4985 | spin_unlock(ptl); |
Andrea Arcangeli | 1a5a990 | 2012-03-21 16:33:42 -0700 | [diff] [blame] | 4986 | return 0; |
Naoya Horiguchi | 1272485 | 2012-03-21 16:34:28 -0700 | [diff] [blame] | 4987 | } |
| 4988 | |
Andrea Arcangeli | 45f83ce | 2012-03-28 14:42:40 -0700 | [diff] [blame] | 4989 | if (pmd_trans_unstable(pmd)) |
| 4990 | return 0; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4991 | retry: |
| 4992 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
| 4993 | for (; addr != end; addr += PAGE_SIZE) { |
| 4994 | pte_t ptent = *(pte++); |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 4995 | bool device = false; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 4996 | swp_entry_t ent; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 4997 | |
| 4998 | if (!mc.precharge) |
| 4999 | break; |
| 5000 | |
Naoya Horiguchi | 8d32ff8 | 2012-03-21 16:34:27 -0700 | [diff] [blame] | 5001 | switch (get_mctgt_type(vma, addr, ptent, &target)) { |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 5002 | case MC_TARGET_DEVICE: |
| 5003 | device = true; |
| 5004 | /* fall through */ |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5005 | case MC_TARGET_PAGE: |
| 5006 | page = target.page; |
Kirill A. Shutemov | 53f9263 | 2016-01-15 16:53:42 -0800 | [diff] [blame] | 5007 | /* |
| 5008 | * We can have a part of the split pmd here. Moving it |
| 5009 | * can be done but it would be too convoluted so simply |
| 5010 | * ignore such a partial THP and keep it in original |
| 5011 | * memcg. There should be somebody mapping the head. |
| 5012 | */ |
| 5013 | if (PageTransCompound(page)) |
| 5014 | goto put; |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 5015 | if (!device && isolate_lru_page(page)) |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5016 | goto put; |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 5017 | if (!mem_cgroup_move_account(page, false, |
| 5018 | mc.from, mc.to)) { |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5019 | mc.precharge--; |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 5020 | /* we uncharge from mc.from later. */ |
| 5021 | mc.moved_charge++; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5022 | } |
Jérôme Glisse | c733a82 | 2017-09-08 16:11:54 -0700 | [diff] [blame] | 5023 | if (!device) |
| 5024 | putback_lru_page(page); |
Naoya Horiguchi | 8d32ff8 | 2012-03-21 16:34:27 -0700 | [diff] [blame] | 5025 | put: /* get_mctgt_type() gets the page */ |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5026 | put_page(page); |
| 5027 | break; |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 5028 | case MC_TARGET_SWAP: |
| 5029 | ent = target.ent; |
Hugh Dickins | e91cbb4 | 2012-05-29 15:06:51 -0700 | [diff] [blame] | 5030 | if (!mem_cgroup_move_swap_account(ent, mc.from, mc.to)) { |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 5031 | mc.precharge--; |
Daisuke Nishimura | 483c30b | 2010-03-10 15:22:18 -0800 | [diff] [blame] | 5032 | /* we fixup refcnts and charges later. */ |
| 5033 | mc.moved_swap++; |
| 5034 | } |
Daisuke Nishimura | 0249144 | 2010-03-10 15:22:17 -0800 | [diff] [blame] | 5035 | break; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5036 | default: |
| 5037 | break; |
| 5038 | } |
| 5039 | } |
| 5040 | pte_unmap_unlock(pte - 1, ptl); |
| 5041 | cond_resched(); |
| 5042 | |
| 5043 | if (addr != end) { |
| 5044 | /* |
| 5045 | * We have consumed all precharges we got in can_attach(). |
| 5046 | * We try charge one by one, but don't do any additional |
| 5047 | * charges to mc.to if we have failed in charge once in attach() |
| 5048 | * phase. |
| 5049 | */ |
Daisuke Nishimura | 854ffa8 | 2010-03-10 15:22:15 -0800 | [diff] [blame] | 5050 | ret = mem_cgroup_do_precharge(1); |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5051 | if (!ret) |
| 5052 | goto retry; |
| 5053 | } |
| 5054 | |
| 5055 | return ret; |
| 5056 | } |
| 5057 | |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 5058 | static void mem_cgroup_move_charge(void) |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5059 | { |
Naoya Horiguchi | 26bcd64 | 2015-02-11 15:27:57 -0800 | [diff] [blame] | 5060 | struct mm_walk mem_cgroup_move_charge_walk = { |
| 5061 | .pmd_entry = mem_cgroup_move_charge_pte_range, |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 5062 | .mm = mc.mm, |
Naoya Horiguchi | 26bcd64 | 2015-02-11 15:27:57 -0800 | [diff] [blame] | 5063 | }; |
Daisuke Nishimura | 4ffef5f | 2010-03-10 15:22:14 -0800 | [diff] [blame] | 5064 | |
| 5065 | lru_add_drain_all(); |
Johannes Weiner | 312722c | 2014-12-10 15:44:25 -0800 | [diff] [blame] | 5066 | /* |
Johannes Weiner | 81f8c3a | 2016-03-15 14:57:04 -0700 | [diff] [blame] | 5067 | * Signal lock_page_memcg() to take the memcg's move_lock |
| 5068 | * while we're moving its pages to another memcg. Then wait |
| 5069 | * for already started RCU-only updates to finish. |
Johannes Weiner | 312722c | 2014-12-10 15:44:25 -0800 | [diff] [blame] | 5070 | */ |
| 5071 | atomic_inc(&mc.from->moving_account); |
| 5072 | synchronize_rcu(); |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 5073 | retry: |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 5074 | if (unlikely(!down_read_trylock(&mc.mm->mmap_sem))) { |
Daisuke Nishimura | dfe076b | 2011-01-13 15:47:41 -0800 | [diff] [blame] | 5075 | /* |
| 5076 | * Someone who are holding the mmap_sem might be waiting in |
| 5077 | * waitq. So we cancel all extra charges, wake up all waiters, |
| 5078 | * and retry. Because we cancel precharges, we might not be able |
| 5079 | * to move enough charges, but moving charge is a best-effort |
| 5080 | * feature anyway, so it wouldn't be a big problem. |
| 5081 | */ |
| 5082 | __mem_cgroup_clear_mc(); |
| 5083 | cond_resched(); |
| 5084 | goto retry; |
| 5085 | } |
Naoya Horiguchi | 26bcd64 | 2015-02-11 15:27:57 -0800 | [diff] [blame] | 5086 | /* |
| 5087 | * When we have consumed all precharges and failed in doing |
| 5088 | * additional charge, the page walk just aborts. |
| 5089 | */ |
James Morse | 0247f3f | 2016-10-07 17:00:12 -0700 | [diff] [blame] | 5090 | walk_page_range(0, mc.mm->highest_vm_end, &mem_cgroup_move_charge_walk); |
| 5091 | |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 5092 | up_read(&mc.mm->mmap_sem); |
Johannes Weiner | 312722c | 2014-12-10 15:44:25 -0800 | [diff] [blame] | 5093 | atomic_dec(&mc.from->moving_account); |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 5094 | } |
| 5095 | |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 5096 | static void mem_cgroup_move_task(void) |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 5097 | { |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 5098 | if (mc.to) { |
| 5099 | mem_cgroup_move_charge(); |
KOSAKI Motohiro | a433658 | 2011-06-15 15:08:13 -0700 | [diff] [blame] | 5100 | mem_cgroup_clear_mc(); |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 5101 | } |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 5102 | } |
Daisuke Nishimura | 5cfb80a | 2010-03-23 13:35:11 -0700 | [diff] [blame] | 5103 | #else /* !CONFIG_MMU */ |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 5104 | static int mem_cgroup_can_attach(struct cgroup_taskset *tset) |
Daisuke Nishimura | 5cfb80a | 2010-03-23 13:35:11 -0700 | [diff] [blame] | 5105 | { |
| 5106 | return 0; |
| 5107 | } |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 5108 | static void mem_cgroup_cancel_attach(struct cgroup_taskset *tset) |
Daisuke Nishimura | 5cfb80a | 2010-03-23 13:35:11 -0700 | [diff] [blame] | 5109 | { |
| 5110 | } |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 5111 | static void mem_cgroup_move_task(void) |
Daisuke Nishimura | 5cfb80a | 2010-03-23 13:35:11 -0700 | [diff] [blame] | 5112 | { |
| 5113 | } |
| 5114 | #endif |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 5115 | |
Tejun Heo | f00baae | 2013-04-15 13:41:15 -0700 | [diff] [blame] | 5116 | /* |
| 5117 | * Cgroup retains root cgroups across [un]mount cycles making it necessary |
Tejun Heo | aa6ec29 | 2014-07-09 10:08:08 -0400 | [diff] [blame] | 5118 | * to verify whether we're attached to the default hierarchy on each mount |
| 5119 | * attempt. |
Tejun Heo | f00baae | 2013-04-15 13:41:15 -0700 | [diff] [blame] | 5120 | */ |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 5121 | static void mem_cgroup_bind(struct cgroup_subsys_state *root_css) |
Tejun Heo | f00baae | 2013-04-15 13:41:15 -0700 | [diff] [blame] | 5122 | { |
| 5123 | /* |
Tejun Heo | aa6ec29 | 2014-07-09 10:08:08 -0400 | [diff] [blame] | 5124 | * use_hierarchy is forced on the default hierarchy. cgroup core |
Tejun Heo | f00baae | 2013-04-15 13:41:15 -0700 | [diff] [blame] | 5125 | * guarantees that @root doesn't have any children, so turning it |
| 5126 | * on for the root memcg is enough. |
| 5127 | */ |
Tejun Heo | 9e10a13 | 2015-09-18 11:56:28 -0400 | [diff] [blame] | 5128 | if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
Vladimir Davydov | 7feee59 | 2015-03-12 16:26:19 -0700 | [diff] [blame] | 5129 | root_mem_cgroup->use_hierarchy = true; |
| 5130 | else |
| 5131 | root_mem_cgroup->use_hierarchy = false; |
Tejun Heo | f00baae | 2013-04-15 13:41:15 -0700 | [diff] [blame] | 5132 | } |
| 5133 | |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5134 | static u64 memory_current_read(struct cgroup_subsys_state *css, |
| 5135 | struct cftype *cft) |
| 5136 | { |
Johannes Weiner | f5fc3c5d | 2015-11-05 18:50:23 -0800 | [diff] [blame] | 5137 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
| 5138 | |
| 5139 | return (u64)page_counter_read(&memcg->memory) * PAGE_SIZE; |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5140 | } |
| 5141 | |
| 5142 | static int memory_low_show(struct seq_file *m, void *v) |
| 5143 | { |
| 5144 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 5145 | unsigned long low = READ_ONCE(memcg->low); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5146 | |
| 5147 | if (low == PAGE_COUNTER_MAX) |
Johannes Weiner | d297369 | 2015-02-27 15:52:04 -0800 | [diff] [blame] | 5148 | seq_puts(m, "max\n"); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5149 | else |
| 5150 | seq_printf(m, "%llu\n", (u64)low * PAGE_SIZE); |
| 5151 | |
| 5152 | return 0; |
| 5153 | } |
| 5154 | |
| 5155 | static ssize_t memory_low_write(struct kernfs_open_file *of, |
| 5156 | char *buf, size_t nbytes, loff_t off) |
| 5157 | { |
| 5158 | struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); |
| 5159 | unsigned long low; |
| 5160 | int err; |
| 5161 | |
| 5162 | buf = strstrip(buf); |
Johannes Weiner | d297369 | 2015-02-27 15:52:04 -0800 | [diff] [blame] | 5163 | err = page_counter_memparse(buf, "max", &low); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5164 | if (err) |
| 5165 | return err; |
| 5166 | |
| 5167 | memcg->low = low; |
| 5168 | |
| 5169 | return nbytes; |
| 5170 | } |
| 5171 | |
| 5172 | static int memory_high_show(struct seq_file *m, void *v) |
| 5173 | { |
| 5174 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 5175 | unsigned long high = READ_ONCE(memcg->high); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5176 | |
| 5177 | if (high == PAGE_COUNTER_MAX) |
Johannes Weiner | d297369 | 2015-02-27 15:52:04 -0800 | [diff] [blame] | 5178 | seq_puts(m, "max\n"); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5179 | else |
| 5180 | seq_printf(m, "%llu\n", (u64)high * PAGE_SIZE); |
| 5181 | |
| 5182 | return 0; |
| 5183 | } |
| 5184 | |
| 5185 | static ssize_t memory_high_write(struct kernfs_open_file *of, |
| 5186 | char *buf, size_t nbytes, loff_t off) |
| 5187 | { |
| 5188 | struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); |
Johannes Weiner | 588083b | 2016-03-17 14:20:25 -0700 | [diff] [blame] | 5189 | unsigned long nr_pages; |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5190 | unsigned long high; |
| 5191 | int err; |
| 5192 | |
| 5193 | buf = strstrip(buf); |
Johannes Weiner | d297369 | 2015-02-27 15:52:04 -0800 | [diff] [blame] | 5194 | err = page_counter_memparse(buf, "max", &high); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5195 | if (err) |
| 5196 | return err; |
| 5197 | |
| 5198 | memcg->high = high; |
| 5199 | |
Johannes Weiner | 588083b | 2016-03-17 14:20:25 -0700 | [diff] [blame] | 5200 | nr_pages = page_counter_read(&memcg->memory); |
| 5201 | if (nr_pages > high) |
| 5202 | try_to_free_mem_cgroup_pages(memcg, nr_pages - high, |
| 5203 | GFP_KERNEL, true); |
| 5204 | |
Tejun Heo | 2529bb3 | 2015-05-22 18:23:34 -0400 | [diff] [blame] | 5205 | memcg_wb_domain_size_changed(memcg); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5206 | return nbytes; |
| 5207 | } |
| 5208 | |
| 5209 | static int memory_max_show(struct seq_file *m, void *v) |
| 5210 | { |
| 5211 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); |
Jason Low | 4db0c3c | 2015-04-15 16:14:08 -0700 | [diff] [blame] | 5212 | unsigned long max = READ_ONCE(memcg->memory.limit); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5213 | |
| 5214 | if (max == PAGE_COUNTER_MAX) |
Johannes Weiner | d297369 | 2015-02-27 15:52:04 -0800 | [diff] [blame] | 5215 | seq_puts(m, "max\n"); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5216 | else |
| 5217 | seq_printf(m, "%llu\n", (u64)max * PAGE_SIZE); |
| 5218 | |
| 5219 | return 0; |
| 5220 | } |
| 5221 | |
| 5222 | static ssize_t memory_max_write(struct kernfs_open_file *of, |
| 5223 | char *buf, size_t nbytes, loff_t off) |
| 5224 | { |
| 5225 | struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); |
Johannes Weiner | b6e6edc | 2016-03-17 14:20:28 -0700 | [diff] [blame] | 5226 | unsigned int nr_reclaims = MEM_CGROUP_RECLAIM_RETRIES; |
| 5227 | bool drained = false; |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5228 | unsigned long max; |
| 5229 | int err; |
| 5230 | |
| 5231 | buf = strstrip(buf); |
Johannes Weiner | d297369 | 2015-02-27 15:52:04 -0800 | [diff] [blame] | 5232 | err = page_counter_memparse(buf, "max", &max); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5233 | if (err) |
| 5234 | return err; |
| 5235 | |
Johannes Weiner | b6e6edc | 2016-03-17 14:20:28 -0700 | [diff] [blame] | 5236 | xchg(&memcg->memory.limit, max); |
| 5237 | |
| 5238 | for (;;) { |
| 5239 | unsigned long nr_pages = page_counter_read(&memcg->memory); |
| 5240 | |
| 5241 | if (nr_pages <= max) |
| 5242 | break; |
| 5243 | |
| 5244 | if (signal_pending(current)) { |
| 5245 | err = -EINTR; |
| 5246 | break; |
| 5247 | } |
| 5248 | |
| 5249 | if (!drained) { |
| 5250 | drain_all_stock(memcg); |
| 5251 | drained = true; |
| 5252 | continue; |
| 5253 | } |
| 5254 | |
| 5255 | if (nr_reclaims) { |
| 5256 | if (!try_to_free_mem_cgroup_pages(memcg, nr_pages - max, |
| 5257 | GFP_KERNEL, true)) |
| 5258 | nr_reclaims--; |
| 5259 | continue; |
| 5260 | } |
| 5261 | |
Johannes Weiner | 31176c7 | 2017-05-03 14:55:07 -0700 | [diff] [blame] | 5262 | mem_cgroup_event(memcg, MEMCG_OOM); |
Johannes Weiner | b6e6edc | 2016-03-17 14:20:28 -0700 | [diff] [blame] | 5263 | if (!mem_cgroup_out_of_memory(memcg, GFP_KERNEL, 0)) |
| 5264 | break; |
| 5265 | } |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5266 | |
Tejun Heo | 2529bb3 | 2015-05-22 18:23:34 -0400 | [diff] [blame] | 5267 | memcg_wb_domain_size_changed(memcg); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5268 | return nbytes; |
| 5269 | } |
| 5270 | |
| 5271 | static int memory_events_show(struct seq_file *m, void *v) |
| 5272 | { |
| 5273 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); |
| 5274 | |
Johannes Weiner | ccda7f4 | 2017-05-03 14:55:16 -0700 | [diff] [blame] | 5275 | seq_printf(m, "low %lu\n", memcg_sum_events(memcg, MEMCG_LOW)); |
| 5276 | seq_printf(m, "high %lu\n", memcg_sum_events(memcg, MEMCG_HIGH)); |
| 5277 | seq_printf(m, "max %lu\n", memcg_sum_events(memcg, MEMCG_MAX)); |
| 5278 | seq_printf(m, "oom %lu\n", memcg_sum_events(memcg, MEMCG_OOM)); |
Konstantin Khlebnikov | 8e675f7 | 2017-07-06 15:40:28 -0700 | [diff] [blame] | 5279 | seq_printf(m, "oom_kill %lu\n", memcg_sum_events(memcg, OOM_KILL)); |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5280 | |
| 5281 | return 0; |
| 5282 | } |
| 5283 | |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5284 | static int memory_stat_show(struct seq_file *m, void *v) |
| 5285 | { |
| 5286 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 5287 | unsigned long stat[MEMCG_NR_STAT]; |
| 5288 | unsigned long events[MEMCG_NR_EVENTS]; |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5289 | int i; |
| 5290 | |
| 5291 | /* |
| 5292 | * Provide statistics on the state of the memory subsystem as |
| 5293 | * well as cumulative event counters that show past behavior. |
| 5294 | * |
| 5295 | * This list is ordered following a combination of these gradients: |
| 5296 | * 1) generic big picture -> specifics and details |
| 5297 | * 2) reflecting userspace activity -> reflecting kernel heuristics |
| 5298 | * |
| 5299 | * Current memory state: |
| 5300 | */ |
| 5301 | |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 5302 | tree_stat(memcg, stat); |
| 5303 | tree_events(memcg, events); |
| 5304 | |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5305 | seq_printf(m, "anon %llu\n", |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 5306 | (u64)stat[MEMCG_RSS] * PAGE_SIZE); |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5307 | seq_printf(m, "file %llu\n", |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 5308 | (u64)stat[MEMCG_CACHE] * PAGE_SIZE); |
Vladimir Davydov | 12580e4 | 2016-03-17 14:17:38 -0700 | [diff] [blame] | 5309 | seq_printf(m, "kernel_stack %llu\n", |
Andy Lutomirski | efdc949 | 2016-07-28 15:48:17 -0700 | [diff] [blame] | 5310 | (u64)stat[MEMCG_KERNEL_STACK_KB] * 1024); |
Vladimir Davydov | 27ee57c | 2016-03-17 14:17:35 -0700 | [diff] [blame] | 5311 | seq_printf(m, "slab %llu\n", |
Johannes Weiner | 3204929 | 2017-07-06 15:40:46 -0700 | [diff] [blame] | 5312 | (u64)(stat[NR_SLAB_RECLAIMABLE] + |
| 5313 | stat[NR_SLAB_UNRECLAIMABLE]) * PAGE_SIZE); |
Johannes Weiner | b2807f0 | 2016-01-20 15:03:22 -0800 | [diff] [blame] | 5314 | seq_printf(m, "sock %llu\n", |
Vladimir Davydov | 72b54e7 | 2016-03-17 14:17:32 -0700 | [diff] [blame] | 5315 | (u64)stat[MEMCG_SOCK] * PAGE_SIZE); |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5316 | |
Johannes Weiner | 9a4caf1 | 2017-05-03 14:52:45 -0700 | [diff] [blame] | 5317 | seq_printf(m, "shmem %llu\n", |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 5318 | (u64)stat[NR_SHMEM] * PAGE_SIZE); |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5319 | seq_printf(m, "file_mapped %llu\n", |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 5320 | (u64)stat[NR_FILE_MAPPED] * PAGE_SIZE); |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5321 | seq_printf(m, "file_dirty %llu\n", |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 5322 | (u64)stat[NR_FILE_DIRTY] * PAGE_SIZE); |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5323 | seq_printf(m, "file_writeback %llu\n", |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 5324 | (u64)stat[NR_WRITEBACK] * PAGE_SIZE); |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5325 | |
| 5326 | for (i = 0; i < NR_LRU_LISTS; i++) { |
| 5327 | struct mem_cgroup *mi; |
| 5328 | unsigned long val = 0; |
| 5329 | |
| 5330 | for_each_mem_cgroup_tree(mi, memcg) |
| 5331 | val += mem_cgroup_nr_lru_pages(mi, BIT(i)); |
| 5332 | seq_printf(m, "%s %llu\n", |
| 5333 | mem_cgroup_lru_names[i], (u64)val * PAGE_SIZE); |
| 5334 | } |
| 5335 | |
Vladimir Davydov | 27ee57c | 2016-03-17 14:17:35 -0700 | [diff] [blame] | 5336 | seq_printf(m, "slab_reclaimable %llu\n", |
Johannes Weiner | 3204929 | 2017-07-06 15:40:46 -0700 | [diff] [blame] | 5337 | (u64)stat[NR_SLAB_RECLAIMABLE] * PAGE_SIZE); |
Vladimir Davydov | 27ee57c | 2016-03-17 14:17:35 -0700 | [diff] [blame] | 5338 | seq_printf(m, "slab_unreclaimable %llu\n", |
Johannes Weiner | 3204929 | 2017-07-06 15:40:46 -0700 | [diff] [blame] | 5339 | (u64)stat[NR_SLAB_UNRECLAIMABLE] * PAGE_SIZE); |
Vladimir Davydov | 27ee57c | 2016-03-17 14:17:35 -0700 | [diff] [blame] | 5340 | |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5341 | /* Accumulated memory events */ |
| 5342 | |
Johannes Weiner | df0e53d | 2017-05-03 14:55:10 -0700 | [diff] [blame] | 5343 | seq_printf(m, "pgfault %lu\n", events[PGFAULT]); |
| 5344 | seq_printf(m, "pgmajfault %lu\n", events[PGMAJFAULT]); |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5345 | |
Roman Gushchin | 2262185 | 2017-07-06 15:40:25 -0700 | [diff] [blame] | 5346 | seq_printf(m, "pgrefill %lu\n", events[PGREFILL]); |
| 5347 | seq_printf(m, "pgscan %lu\n", events[PGSCAN_KSWAPD] + |
| 5348 | events[PGSCAN_DIRECT]); |
| 5349 | seq_printf(m, "pgsteal %lu\n", events[PGSTEAL_KSWAPD] + |
| 5350 | events[PGSTEAL_DIRECT]); |
| 5351 | seq_printf(m, "pgactivate %lu\n", events[PGACTIVATE]); |
| 5352 | seq_printf(m, "pgdeactivate %lu\n", events[PGDEACTIVATE]); |
| 5353 | seq_printf(m, "pglazyfree %lu\n", events[PGLAZYFREE]); |
| 5354 | seq_printf(m, "pglazyfreed %lu\n", events[PGLAZYFREED]); |
| 5355 | |
Johannes Weiner | 2a2e488 | 2017-05-03 14:55:03 -0700 | [diff] [blame] | 5356 | seq_printf(m, "workingset_refault %lu\n", |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 5357 | stat[WORKINGSET_REFAULT]); |
Johannes Weiner | 2a2e488 | 2017-05-03 14:55:03 -0700 | [diff] [blame] | 5358 | seq_printf(m, "workingset_activate %lu\n", |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 5359 | stat[WORKINGSET_ACTIVATE]); |
Johannes Weiner | 2a2e488 | 2017-05-03 14:55:03 -0700 | [diff] [blame] | 5360 | seq_printf(m, "workingset_nodereclaim %lu\n", |
Johannes Weiner | 71cd311 | 2017-05-03 14:55:13 -0700 | [diff] [blame] | 5361 | stat[WORKINGSET_NODERECLAIM]); |
Johannes Weiner | 2a2e488 | 2017-05-03 14:55:03 -0700 | [diff] [blame] | 5362 | |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5363 | return 0; |
| 5364 | } |
| 5365 | |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5366 | static struct cftype memory_files[] = { |
| 5367 | { |
| 5368 | .name = "current", |
Johannes Weiner | f5fc3c5d | 2015-11-05 18:50:23 -0800 | [diff] [blame] | 5369 | .flags = CFTYPE_NOT_ON_ROOT, |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5370 | .read_u64 = memory_current_read, |
| 5371 | }, |
| 5372 | { |
| 5373 | .name = "low", |
| 5374 | .flags = CFTYPE_NOT_ON_ROOT, |
| 5375 | .seq_show = memory_low_show, |
| 5376 | .write = memory_low_write, |
| 5377 | }, |
| 5378 | { |
| 5379 | .name = "high", |
| 5380 | .flags = CFTYPE_NOT_ON_ROOT, |
| 5381 | .seq_show = memory_high_show, |
| 5382 | .write = memory_high_write, |
| 5383 | }, |
| 5384 | { |
| 5385 | .name = "max", |
| 5386 | .flags = CFTYPE_NOT_ON_ROOT, |
| 5387 | .seq_show = memory_max_show, |
| 5388 | .write = memory_max_write, |
| 5389 | }, |
| 5390 | { |
| 5391 | .name = "events", |
| 5392 | .flags = CFTYPE_NOT_ON_ROOT, |
Tejun Heo | 472912a | 2015-09-18 18:01:59 -0400 | [diff] [blame] | 5393 | .file_offset = offsetof(struct mem_cgroup, events_file), |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5394 | .seq_show = memory_events_show, |
| 5395 | }, |
Johannes Weiner | 587d9f7 | 2016-01-20 15:03:19 -0800 | [diff] [blame] | 5396 | { |
| 5397 | .name = "stat", |
| 5398 | .flags = CFTYPE_NOT_ON_ROOT, |
| 5399 | .seq_show = memory_stat_show, |
| 5400 | }, |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5401 | { } /* terminate */ |
| 5402 | }; |
| 5403 | |
Tejun Heo | 073219e | 2014-02-08 10:36:58 -0500 | [diff] [blame] | 5404 | struct cgroup_subsys memory_cgrp_subsys = { |
Tejun Heo | 92fb974 | 2012-11-19 08:13:38 -0800 | [diff] [blame] | 5405 | .css_alloc = mem_cgroup_css_alloc, |
Glauber Costa | d142e3e | 2013-02-22 16:34:52 -0800 | [diff] [blame] | 5406 | .css_online = mem_cgroup_css_online, |
Tejun Heo | 92fb974 | 2012-11-19 08:13:38 -0800 | [diff] [blame] | 5407 | .css_offline = mem_cgroup_css_offline, |
Vladimir Davydov | 6df3868 | 2015-12-29 14:54:10 -0800 | [diff] [blame] | 5408 | .css_released = mem_cgroup_css_released, |
Tejun Heo | 92fb974 | 2012-11-19 08:13:38 -0800 | [diff] [blame] | 5409 | .css_free = mem_cgroup_css_free, |
Tejun Heo | 1ced953 | 2014-07-08 18:02:57 -0400 | [diff] [blame] | 5410 | .css_reset = mem_cgroup_css_reset, |
Daisuke Nishimura | 7dc74be | 2010-03-10 15:22:13 -0800 | [diff] [blame] | 5411 | .can_attach = mem_cgroup_can_attach, |
| 5412 | .cancel_attach = mem_cgroup_cancel_attach, |
Tejun Heo | 264a0ae | 2016-04-21 19:09:02 -0400 | [diff] [blame] | 5413 | .post_attach = mem_cgroup_move_task, |
Tejun Heo | f00baae | 2013-04-15 13:41:15 -0700 | [diff] [blame] | 5414 | .bind = mem_cgroup_bind, |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5415 | .dfl_cftypes = memory_files, |
| 5416 | .legacy_cftypes = mem_cgroup_legacy_files, |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 5417 | .early_init = 0, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 5418 | }; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 5419 | |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5420 | /** |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5421 | * mem_cgroup_low - check if memory consumption is below the normal range |
Sean Christopherson | 34c8105 | 2017-07-10 15:48:05 -0700 | [diff] [blame] | 5422 | * @root: the top ancestor of the sub-tree being checked |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5423 | * @memcg: the memory cgroup to check |
| 5424 | * |
| 5425 | * Returns %true if memory consumption of @memcg, and that of all |
Sean Christopherson | 34c8105 | 2017-07-10 15:48:05 -0700 | [diff] [blame] | 5426 | * ancestors up to (but not including) @root, is below the normal range. |
| 5427 | * |
| 5428 | * @root is exclusive; it is never low when looked at directly and isn't |
| 5429 | * checked when traversing the hierarchy. |
| 5430 | * |
| 5431 | * Excluding @root enables using memory.low to prioritize memory usage |
| 5432 | * between cgroups within a subtree of the hierarchy that is limited by |
| 5433 | * memory.high or memory.max. |
| 5434 | * |
| 5435 | * For example, given cgroup A with children B and C: |
| 5436 | * |
| 5437 | * A |
| 5438 | * / \ |
| 5439 | * B C |
| 5440 | * |
| 5441 | * and |
| 5442 | * |
| 5443 | * 1. A/memory.current > A/memory.high |
| 5444 | * 2. A/B/memory.current < A/B/memory.low |
| 5445 | * 3. A/C/memory.current >= A/C/memory.low |
| 5446 | * |
| 5447 | * As 'A' is high, i.e. triggers reclaim from 'A', and 'B' is low, we |
| 5448 | * should reclaim from 'C' until 'A' is no longer high or until we can |
| 5449 | * no longer reclaim from 'C'. If 'A', i.e. @root, isn't excluded by |
| 5450 | * mem_cgroup_low when reclaming from 'A', then 'B' won't be considered |
| 5451 | * low and we will reclaim indiscriminately from both 'B' and 'C'. |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5452 | */ |
| 5453 | bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg) |
| 5454 | { |
| 5455 | if (mem_cgroup_disabled()) |
| 5456 | return false; |
| 5457 | |
Sean Christopherson | 34c8105 | 2017-07-10 15:48:05 -0700 | [diff] [blame] | 5458 | if (!root) |
| 5459 | root = root_mem_cgroup; |
| 5460 | if (memcg == root) |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5461 | return false; |
| 5462 | |
Sean Christopherson | 34c8105 | 2017-07-10 15:48:05 -0700 | [diff] [blame] | 5463 | for (; memcg != root; memcg = parent_mem_cgroup(memcg)) { |
Michal Hocko | 4e54ded | 2015-02-27 15:51:46 -0800 | [diff] [blame] | 5464 | if (page_counter_read(&memcg->memory) >= memcg->low) |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5465 | return false; |
| 5466 | } |
Sean Christopherson | 34c8105 | 2017-07-10 15:48:05 -0700 | [diff] [blame] | 5467 | |
Johannes Weiner | 241994ed | 2015-02-11 15:26:06 -0800 | [diff] [blame] | 5468 | return true; |
| 5469 | } |
| 5470 | |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5471 | /** |
| 5472 | * mem_cgroup_try_charge - try charging a page |
| 5473 | * @page: page to charge |
| 5474 | * @mm: mm context of the victim |
| 5475 | * @gfp_mask: reclaim mode |
| 5476 | * @memcgp: charged memcg return |
Li RongQing | 25843c2 | 2016-07-26 15:26:56 -0700 | [diff] [blame] | 5477 | * @compound: charge the page as compound or small page |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5478 | * |
| 5479 | * Try to charge @page to the memcg that @mm belongs to, reclaiming |
| 5480 | * pages according to @gfp_mask if necessary. |
| 5481 | * |
| 5482 | * Returns 0 on success, with *@memcgp pointing to the charged memcg. |
| 5483 | * Otherwise, an error code is returned. |
| 5484 | * |
| 5485 | * After page->mapping has been set up, the caller must finalize the |
| 5486 | * charge with mem_cgroup_commit_charge(). Or abort the transaction |
| 5487 | * with mem_cgroup_cancel_charge() in case page instantiation fails. |
| 5488 | */ |
| 5489 | int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm, |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 5490 | gfp_t gfp_mask, struct mem_cgroup **memcgp, |
| 5491 | bool compound) |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5492 | { |
| 5493 | struct mem_cgroup *memcg = NULL; |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 5494 | unsigned int nr_pages = compound ? hpage_nr_pages(page) : 1; |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5495 | int ret = 0; |
| 5496 | |
| 5497 | if (mem_cgroup_disabled()) |
| 5498 | goto out; |
| 5499 | |
| 5500 | if (PageSwapCache(page)) { |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5501 | /* |
| 5502 | * Every swap fault against a single page tries to charge the |
| 5503 | * page, bail as early as possible. shmem_unuse() encounters |
| 5504 | * already charged pages, too. The USED bit is protected by |
| 5505 | * the page lock, which serializes swap cache removal, which |
| 5506 | * in turn serializes uncharging. |
| 5507 | */ |
Vladimir Davydov | e993d90 | 2015-09-09 15:35:35 -0700 | [diff] [blame] | 5508 | VM_BUG_ON_PAGE(!PageLocked(page), page); |
Huang Ying | abe2895 | 2017-09-06 16:22:41 -0700 | [diff] [blame] | 5509 | if (compound_head(page)->mem_cgroup) |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5510 | goto out; |
Vladimir Davydov | e993d90 | 2015-09-09 15:35:35 -0700 | [diff] [blame] | 5511 | |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 5512 | if (do_swap_account) { |
Vladimir Davydov | e993d90 | 2015-09-09 15:35:35 -0700 | [diff] [blame] | 5513 | swp_entry_t ent = { .val = page_private(page), }; |
| 5514 | unsigned short id = lookup_swap_cgroup_id(ent); |
| 5515 | |
| 5516 | rcu_read_lock(); |
| 5517 | memcg = mem_cgroup_from_id(id); |
| 5518 | if (memcg && !css_tryget_online(&memcg->css)) |
| 5519 | memcg = NULL; |
| 5520 | rcu_read_unlock(); |
| 5521 | } |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5522 | } |
| 5523 | |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5524 | if (!memcg) |
| 5525 | memcg = get_mem_cgroup_from_mm(mm); |
| 5526 | |
| 5527 | ret = try_charge(memcg, gfp_mask, nr_pages); |
| 5528 | |
| 5529 | css_put(&memcg->css); |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5530 | out: |
| 5531 | *memcgp = memcg; |
| 5532 | return ret; |
| 5533 | } |
| 5534 | |
| 5535 | /** |
| 5536 | * mem_cgroup_commit_charge - commit a page charge |
| 5537 | * @page: page to charge |
| 5538 | * @memcg: memcg to charge the page to |
| 5539 | * @lrucare: page might be on LRU already |
Li RongQing | 25843c2 | 2016-07-26 15:26:56 -0700 | [diff] [blame] | 5540 | * @compound: charge the page as compound or small page |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5541 | * |
| 5542 | * Finalize a charge transaction started by mem_cgroup_try_charge(), |
| 5543 | * after page->mapping has been set up. This must happen atomically |
| 5544 | * as part of the page instantiation, i.e. under the page table lock |
| 5545 | * for anonymous pages, under the page lock for page and swap cache. |
| 5546 | * |
| 5547 | * In addition, the page must not be on the LRU during the commit, to |
| 5548 | * prevent racing with task migration. If it might be, use @lrucare. |
| 5549 | * |
| 5550 | * Use mem_cgroup_cancel_charge() to cancel the transaction instead. |
| 5551 | */ |
| 5552 | void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg, |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 5553 | bool lrucare, bool compound) |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5554 | { |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 5555 | unsigned int nr_pages = compound ? hpage_nr_pages(page) : 1; |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5556 | |
| 5557 | VM_BUG_ON_PAGE(!page->mapping, page); |
| 5558 | VM_BUG_ON_PAGE(PageLRU(page) && !lrucare, page); |
| 5559 | |
| 5560 | if (mem_cgroup_disabled()) |
| 5561 | return; |
| 5562 | /* |
| 5563 | * Swap faults will attempt to charge the same page multiple |
| 5564 | * times. But reuse_swap_page() might have removed the page |
| 5565 | * from swapcache already, so we can't check PageSwapCache(). |
| 5566 | */ |
| 5567 | if (!memcg) |
| 5568 | return; |
| 5569 | |
Johannes Weiner | 6abb5a8 | 2014-08-08 14:19:33 -0700 | [diff] [blame] | 5570 | commit_charge(page, memcg, lrucare); |
| 5571 | |
Johannes Weiner | 6abb5a8 | 2014-08-08 14:19:33 -0700 | [diff] [blame] | 5572 | local_irq_disable(); |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 5573 | mem_cgroup_charge_statistics(memcg, page, compound, nr_pages); |
Johannes Weiner | 6abb5a8 | 2014-08-08 14:19:33 -0700 | [diff] [blame] | 5574 | memcg_check_events(memcg, page); |
| 5575 | local_irq_enable(); |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5576 | |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 5577 | if (do_memsw_account() && PageSwapCache(page)) { |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5578 | swp_entry_t entry = { .val = page_private(page) }; |
| 5579 | /* |
| 5580 | * The swap entry might not get freed for a long time, |
| 5581 | * let's not wait for it. The page already received a |
| 5582 | * memory+swap charge, drop the swap entry duplicate. |
| 5583 | */ |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 5584 | mem_cgroup_uncharge_swap(entry, nr_pages); |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5585 | } |
| 5586 | } |
| 5587 | |
| 5588 | /** |
| 5589 | * mem_cgroup_cancel_charge - cancel a page charge |
| 5590 | * @page: page to charge |
| 5591 | * @memcg: memcg to charge the page to |
Li RongQing | 25843c2 | 2016-07-26 15:26:56 -0700 | [diff] [blame] | 5592 | * @compound: charge the page as compound or small page |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5593 | * |
| 5594 | * Cancel a charge transaction started by mem_cgroup_try_charge(). |
| 5595 | */ |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 5596 | void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg, |
| 5597 | bool compound) |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5598 | { |
Kirill A. Shutemov | f627c2f | 2016-01-15 16:52:20 -0800 | [diff] [blame] | 5599 | unsigned int nr_pages = compound ? hpage_nr_pages(page) : 1; |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5600 | |
| 5601 | if (mem_cgroup_disabled()) |
| 5602 | return; |
| 5603 | /* |
| 5604 | * Swap faults will attempt to charge the same page multiple |
| 5605 | * times. But reuse_swap_page() might have removed the page |
| 5606 | * from swapcache already, so we can't check PageSwapCache(). |
| 5607 | */ |
| 5608 | if (!memcg) |
| 5609 | return; |
| 5610 | |
Johannes Weiner | 00501b5 | 2014-08-08 14:19:20 -0700 | [diff] [blame] | 5611 | cancel_charge(memcg, nr_pages); |
| 5612 | } |
| 5613 | |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5614 | struct uncharge_gather { |
| 5615 | struct mem_cgroup *memcg; |
| 5616 | unsigned long pgpgout; |
| 5617 | unsigned long nr_anon; |
| 5618 | unsigned long nr_file; |
| 5619 | unsigned long nr_kmem; |
| 5620 | unsigned long nr_huge; |
| 5621 | unsigned long nr_shmem; |
| 5622 | struct page *dummy_page; |
| 5623 | }; |
| 5624 | |
| 5625 | static inline void uncharge_gather_clear(struct uncharge_gather *ug) |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5626 | { |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5627 | memset(ug, 0, sizeof(*ug)); |
| 5628 | } |
| 5629 | |
| 5630 | static void uncharge_batch(const struct uncharge_gather *ug) |
| 5631 | { |
| 5632 | unsigned long nr_pages = ug->nr_anon + ug->nr_file + ug->nr_kmem; |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5633 | unsigned long flags; |
| 5634 | |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5635 | if (!mem_cgroup_is_root(ug->memcg)) { |
| 5636 | page_counter_uncharge(&ug->memcg->memory, nr_pages); |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 5637 | if (do_memsw_account()) |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5638 | page_counter_uncharge(&ug->memcg->memsw, nr_pages); |
| 5639 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && ug->nr_kmem) |
| 5640 | page_counter_uncharge(&ug->memcg->kmem, ug->nr_kmem); |
| 5641 | memcg_oom_recover(ug->memcg); |
Johannes Weiner | ce00a96 | 2014-09-05 08:43:57 -0400 | [diff] [blame] | 5642 | } |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5643 | |
| 5644 | local_irq_save(flags); |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5645 | __this_cpu_sub(ug->memcg->stat->count[MEMCG_RSS], ug->nr_anon); |
| 5646 | __this_cpu_sub(ug->memcg->stat->count[MEMCG_CACHE], ug->nr_file); |
| 5647 | __this_cpu_sub(ug->memcg->stat->count[MEMCG_RSS_HUGE], ug->nr_huge); |
| 5648 | __this_cpu_sub(ug->memcg->stat->count[NR_SHMEM], ug->nr_shmem); |
| 5649 | __this_cpu_add(ug->memcg->stat->events[PGPGOUT], ug->pgpgout); |
| 5650 | __this_cpu_add(ug->memcg->stat->nr_page_events, nr_pages); |
| 5651 | memcg_check_events(ug->memcg, ug->dummy_page); |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5652 | local_irq_restore(flags); |
Johannes Weiner | e8ea14c | 2014-12-10 15:42:42 -0800 | [diff] [blame] | 5653 | |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5654 | if (!mem_cgroup_is_root(ug->memcg)) |
| 5655 | css_put_many(&ug->memcg->css, nr_pages); |
| 5656 | } |
| 5657 | |
| 5658 | static void uncharge_page(struct page *page, struct uncharge_gather *ug) |
| 5659 | { |
| 5660 | VM_BUG_ON_PAGE(PageLRU(page), page); |
Jérôme Glisse | 3f2eb02 | 2017-10-03 16:14:57 -0700 | [diff] [blame] | 5661 | VM_BUG_ON_PAGE(page_count(page) && !is_zone_device_page(page) && |
| 5662 | !PageHWPoison(page) , page); |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5663 | |
| 5664 | if (!page->mem_cgroup) |
| 5665 | return; |
| 5666 | |
| 5667 | /* |
| 5668 | * Nobody should be changing or seriously looking at |
| 5669 | * page->mem_cgroup at this point, we have fully |
| 5670 | * exclusive access to the page. |
| 5671 | */ |
| 5672 | |
| 5673 | if (ug->memcg != page->mem_cgroup) { |
| 5674 | if (ug->memcg) { |
| 5675 | uncharge_batch(ug); |
| 5676 | uncharge_gather_clear(ug); |
| 5677 | } |
| 5678 | ug->memcg = page->mem_cgroup; |
| 5679 | } |
| 5680 | |
| 5681 | if (!PageKmemcg(page)) { |
| 5682 | unsigned int nr_pages = 1; |
| 5683 | |
| 5684 | if (PageTransHuge(page)) { |
| 5685 | nr_pages <<= compound_order(page); |
| 5686 | ug->nr_huge += nr_pages; |
| 5687 | } |
| 5688 | if (PageAnon(page)) |
| 5689 | ug->nr_anon += nr_pages; |
| 5690 | else { |
| 5691 | ug->nr_file += nr_pages; |
| 5692 | if (PageSwapBacked(page)) |
| 5693 | ug->nr_shmem += nr_pages; |
| 5694 | } |
| 5695 | ug->pgpgout++; |
| 5696 | } else { |
| 5697 | ug->nr_kmem += 1 << compound_order(page); |
| 5698 | __ClearPageKmemcg(page); |
| 5699 | } |
| 5700 | |
| 5701 | ug->dummy_page = page; |
| 5702 | page->mem_cgroup = NULL; |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5703 | } |
| 5704 | |
| 5705 | static void uncharge_list(struct list_head *page_list) |
| 5706 | { |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5707 | struct uncharge_gather ug; |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5708 | struct list_head *next; |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5709 | |
| 5710 | uncharge_gather_clear(&ug); |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5711 | |
Johannes Weiner | 8b59265 | 2016-03-17 14:20:31 -0700 | [diff] [blame] | 5712 | /* |
| 5713 | * Note that the list can be a single page->lru; hence the |
| 5714 | * do-while loop instead of a simple list_for_each_entry(). |
| 5715 | */ |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5716 | next = page_list->next; |
| 5717 | do { |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5718 | struct page *page; |
| 5719 | |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5720 | page = list_entry(next, struct page, lru); |
| 5721 | next = page->lru.next; |
| 5722 | |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5723 | uncharge_page(page, &ug); |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5724 | } while (next != page_list); |
| 5725 | |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5726 | if (ug.memcg) |
| 5727 | uncharge_batch(&ug); |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5728 | } |
| 5729 | |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5730 | /** |
| 5731 | * mem_cgroup_uncharge - uncharge a page |
| 5732 | * @page: page to uncharge |
| 5733 | * |
| 5734 | * Uncharge a page previously charged with mem_cgroup_try_charge() and |
| 5735 | * mem_cgroup_commit_charge(). |
| 5736 | */ |
| 5737 | void mem_cgroup_uncharge(struct page *page) |
| 5738 | { |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5739 | struct uncharge_gather ug; |
| 5740 | |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5741 | if (mem_cgroup_disabled()) |
| 5742 | return; |
| 5743 | |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5744 | /* Don't touch page->lru of any random page, pre-check: */ |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 5745 | if (!page->mem_cgroup) |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5746 | return; |
| 5747 | |
Jérôme Glisse | a9d5ade | 2017-09-08 16:11:50 -0700 | [diff] [blame] | 5748 | uncharge_gather_clear(&ug); |
| 5749 | uncharge_page(page, &ug); |
| 5750 | uncharge_batch(&ug); |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5751 | } |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5752 | |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5753 | /** |
| 5754 | * mem_cgroup_uncharge_list - uncharge a list of page |
| 5755 | * @page_list: list of pages to uncharge |
| 5756 | * |
| 5757 | * Uncharge a list of pages previously charged with |
| 5758 | * mem_cgroup_try_charge() and mem_cgroup_commit_charge(). |
| 5759 | */ |
| 5760 | void mem_cgroup_uncharge_list(struct list_head *page_list) |
| 5761 | { |
| 5762 | if (mem_cgroup_disabled()) |
| 5763 | return; |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5764 | |
Johannes Weiner | 747db95 | 2014-08-08 14:19:24 -0700 | [diff] [blame] | 5765 | if (!list_empty(page_list)) |
| 5766 | uncharge_list(page_list); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5767 | } |
| 5768 | |
| 5769 | /** |
Johannes Weiner | 6a93ca8 | 2016-03-15 14:57:19 -0700 | [diff] [blame] | 5770 | * mem_cgroup_migrate - charge a page's replacement |
| 5771 | * @oldpage: currently circulating page |
| 5772 | * @newpage: replacement page |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5773 | * |
Johannes Weiner | 6a93ca8 | 2016-03-15 14:57:19 -0700 | [diff] [blame] | 5774 | * Charge @newpage as a replacement page for @oldpage. @oldpage will |
| 5775 | * be uncharged upon free. |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5776 | * |
| 5777 | * Both pages must be locked, @newpage->mapping must be set up. |
| 5778 | */ |
Johannes Weiner | 6a93ca8 | 2016-03-15 14:57:19 -0700 | [diff] [blame] | 5779 | void mem_cgroup_migrate(struct page *oldpage, struct page *newpage) |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5780 | { |
Johannes Weiner | 2983331 | 2014-12-10 15:44:02 -0800 | [diff] [blame] | 5781 | struct mem_cgroup *memcg; |
Johannes Weiner | 44b7a8d | 2016-01-20 15:03:16 -0800 | [diff] [blame] | 5782 | unsigned int nr_pages; |
| 5783 | bool compound; |
Tejun Heo | d93c413 | 2016-06-24 14:49:54 -0700 | [diff] [blame] | 5784 | unsigned long flags; |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5785 | |
| 5786 | VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage); |
| 5787 | VM_BUG_ON_PAGE(!PageLocked(newpage), newpage); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5788 | VM_BUG_ON_PAGE(PageAnon(oldpage) != PageAnon(newpage), newpage); |
Johannes Weiner | 6abb5a8 | 2014-08-08 14:19:33 -0700 | [diff] [blame] | 5789 | VM_BUG_ON_PAGE(PageTransHuge(oldpage) != PageTransHuge(newpage), |
| 5790 | newpage); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5791 | |
| 5792 | if (mem_cgroup_disabled()) |
| 5793 | return; |
| 5794 | |
| 5795 | /* Page cache replacement: new page already charged? */ |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 5796 | if (newpage->mem_cgroup) |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5797 | return; |
| 5798 | |
Hugh Dickins | 45637ba | 2015-11-05 18:49:40 -0800 | [diff] [blame] | 5799 | /* Swapcache readahead pages can get replaced before being charged */ |
Johannes Weiner | 1306a85 | 2014-12-10 15:44:52 -0800 | [diff] [blame] | 5800 | memcg = oldpage->mem_cgroup; |
Johannes Weiner | 2983331 | 2014-12-10 15:44:02 -0800 | [diff] [blame] | 5801 | if (!memcg) |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5802 | return; |
| 5803 | |
Johannes Weiner | 44b7a8d | 2016-01-20 15:03:16 -0800 | [diff] [blame] | 5804 | /* Force-charge the new page. The old one will be freed soon */ |
| 5805 | compound = PageTransHuge(newpage); |
| 5806 | nr_pages = compound ? hpage_nr_pages(newpage) : 1; |
| 5807 | |
| 5808 | page_counter_charge(&memcg->memory, nr_pages); |
| 5809 | if (do_memsw_account()) |
| 5810 | page_counter_charge(&memcg->memsw, nr_pages); |
| 5811 | css_get_many(&memcg->css, nr_pages); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5812 | |
Johannes Weiner | 9cf7666 | 2016-03-15 14:57:58 -0700 | [diff] [blame] | 5813 | commit_charge(newpage, memcg, false); |
Johannes Weiner | 44b7a8d | 2016-01-20 15:03:16 -0800 | [diff] [blame] | 5814 | |
Tejun Heo | d93c413 | 2016-06-24 14:49:54 -0700 | [diff] [blame] | 5815 | local_irq_save(flags); |
Johannes Weiner | 44b7a8d | 2016-01-20 15:03:16 -0800 | [diff] [blame] | 5816 | mem_cgroup_charge_statistics(memcg, newpage, compound, nr_pages); |
| 5817 | memcg_check_events(memcg, newpage); |
Tejun Heo | d93c413 | 2016-06-24 14:49:54 -0700 | [diff] [blame] | 5818 | local_irq_restore(flags); |
Johannes Weiner | 0a31bc9 | 2014-08-08 14:19:22 -0700 | [diff] [blame] | 5819 | } |
| 5820 | |
Johannes Weiner | ef12947 | 2016-01-14 15:21:34 -0800 | [diff] [blame] | 5821 | DEFINE_STATIC_KEY_FALSE(memcg_sockets_enabled_key); |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5822 | EXPORT_SYMBOL(memcg_sockets_enabled_key); |
| 5823 | |
Johannes Weiner | 2d75807 | 2016-10-07 17:00:58 -0700 | [diff] [blame] | 5824 | void mem_cgroup_sk_alloc(struct sock *sk) |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5825 | { |
| 5826 | struct mem_cgroup *memcg; |
| 5827 | |
Johannes Weiner | 2d75807 | 2016-10-07 17:00:58 -0700 | [diff] [blame] | 5828 | if (!mem_cgroup_sockets_enabled) |
| 5829 | return; |
| 5830 | |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5831 | rcu_read_lock(); |
| 5832 | memcg = mem_cgroup_from_task(current); |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5833 | if (memcg == root_mem_cgroup) |
| 5834 | goto out; |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 5835 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && !memcg->tcpmem_active) |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5836 | goto out; |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5837 | if (css_tryget_online(&memcg->css)) |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5838 | sk->sk_memcg = memcg; |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5839 | out: |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5840 | rcu_read_unlock(); |
| 5841 | } |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5842 | |
Johannes Weiner | 2d75807 | 2016-10-07 17:00:58 -0700 | [diff] [blame] | 5843 | void mem_cgroup_sk_free(struct sock *sk) |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5844 | { |
Johannes Weiner | 2d75807 | 2016-10-07 17:00:58 -0700 | [diff] [blame] | 5845 | if (sk->sk_memcg) |
| 5846 | css_put(&sk->sk_memcg->css); |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5847 | } |
| 5848 | |
| 5849 | /** |
| 5850 | * mem_cgroup_charge_skmem - charge socket memory |
| 5851 | * @memcg: memcg to charge |
| 5852 | * @nr_pages: number of pages to charge |
| 5853 | * |
| 5854 | * Charges @nr_pages to @memcg. Returns %true if the charge fit within |
| 5855 | * @memcg's configured limit, %false if the charge had to be forced. |
| 5856 | */ |
| 5857 | bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) |
| 5858 | { |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5859 | gfp_t gfp_mask = GFP_KERNEL; |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5860 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5861 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) { |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 5862 | struct page_counter *fail; |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5863 | |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 5864 | if (page_counter_try_charge(&memcg->tcpmem, nr_pages, &fail)) { |
| 5865 | memcg->tcpmem_pressure = 0; |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5866 | return true; |
| 5867 | } |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 5868 | page_counter_charge(&memcg->tcpmem, nr_pages); |
| 5869 | memcg->tcpmem_pressure = 1; |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5870 | return false; |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5871 | } |
Johannes Weiner | d886f4e | 2016-01-20 15:02:47 -0800 | [diff] [blame] | 5872 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5873 | /* Don't block in the packet receive path */ |
| 5874 | if (in_softirq()) |
| 5875 | gfp_mask = GFP_NOWAIT; |
| 5876 | |
Johannes Weiner | b2807f0 | 2016-01-20 15:03:22 -0800 | [diff] [blame] | 5877 | this_cpu_add(memcg->stat->count[MEMCG_SOCK], nr_pages); |
| 5878 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5879 | if (try_charge(memcg, gfp_mask, nr_pages) == 0) |
| 5880 | return true; |
| 5881 | |
| 5882 | try_charge(memcg, gfp_mask|__GFP_NOFAIL, nr_pages); |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5883 | return false; |
| 5884 | } |
| 5885 | |
| 5886 | /** |
| 5887 | * mem_cgroup_uncharge_skmem - uncharge socket memory |
| 5888 | * @memcg - memcg to uncharge |
| 5889 | * @nr_pages - number of pages to uncharge |
| 5890 | */ |
| 5891 | void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) |
| 5892 | { |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5893 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) { |
Johannes Weiner | 0db1529 | 2016-01-20 15:02:50 -0800 | [diff] [blame] | 5894 | page_counter_uncharge(&memcg->tcpmem, nr_pages); |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5895 | return; |
| 5896 | } |
Johannes Weiner | d886f4e | 2016-01-20 15:02:47 -0800 | [diff] [blame] | 5897 | |
Johannes Weiner | b2807f0 | 2016-01-20 15:03:22 -0800 | [diff] [blame] | 5898 | this_cpu_sub(memcg->stat->count[MEMCG_SOCK], nr_pages); |
| 5899 | |
Roman Gushchin | 475d048 | 2017-09-08 16:13:09 -0700 | [diff] [blame] | 5900 | refill_stock(memcg, nr_pages); |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5901 | } |
| 5902 | |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5903 | static int __init cgroup_memory(char *s) |
| 5904 | { |
| 5905 | char *token; |
| 5906 | |
| 5907 | while ((token = strsep(&s, ",")) != NULL) { |
| 5908 | if (!*token) |
| 5909 | continue; |
| 5910 | if (!strcmp(token, "nosocket")) |
| 5911 | cgroup_memory_nosocket = true; |
Vladimir Davydov | 04823c8 | 2016-01-20 15:02:38 -0800 | [diff] [blame] | 5912 | if (!strcmp(token, "nokmem")) |
| 5913 | cgroup_memory_nokmem = true; |
Johannes Weiner | f7e1cb6 | 2016-01-14 15:21:29 -0800 | [diff] [blame] | 5914 | } |
| 5915 | return 0; |
| 5916 | } |
| 5917 | __setup("cgroup.memory=", cgroup_memory); |
Johannes Weiner | 1109208 | 2016-01-14 15:21:26 -0800 | [diff] [blame] | 5918 | |
Michal Hocko | 2d11085 | 2013-02-22 16:34:43 -0800 | [diff] [blame] | 5919 | /* |
Michal Hocko | 1081312 | 2013-02-22 16:35:41 -0800 | [diff] [blame] | 5920 | * subsys_initcall() for memory controller. |
| 5921 | * |
Sebastian Andrzej Siewior | 308167f | 2016-11-03 15:49:59 +0100 | [diff] [blame] | 5922 | * Some parts like memcg_hotplug_cpu_dead() have to be initialized from this |
| 5923 | * context because of lock dependencies (cgroup_lock -> cpu hotplug) but |
| 5924 | * basically everything that doesn't depend on a specific mem_cgroup structure |
| 5925 | * should be initialized from here. |
Michal Hocko | 2d11085 | 2013-02-22 16:34:43 -0800 | [diff] [blame] | 5926 | */ |
| 5927 | static int __init mem_cgroup_init(void) |
| 5928 | { |
Johannes Weiner | 95a045f | 2015-02-11 15:26:33 -0800 | [diff] [blame] | 5929 | int cpu, node; |
| 5930 | |
Vladimir Davydov | 13583c3 | 2016-12-12 16:41:29 -0800 | [diff] [blame] | 5931 | #ifndef CONFIG_SLOB |
| 5932 | /* |
| 5933 | * Kmem cache creation is mostly done with the slab_mutex held, |
Tejun Heo | 17cc4df | 2017-02-22 15:41:36 -0800 | [diff] [blame] | 5934 | * so use a workqueue with limited concurrency to avoid stalling |
| 5935 | * all worker threads in case lots of cgroups are created and |
| 5936 | * destroyed simultaneously. |
Vladimir Davydov | 13583c3 | 2016-12-12 16:41:29 -0800 | [diff] [blame] | 5937 | */ |
Tejun Heo | 17cc4df | 2017-02-22 15:41:36 -0800 | [diff] [blame] | 5938 | memcg_kmem_cache_wq = alloc_workqueue("memcg_kmem_cache", 0, 1); |
| 5939 | BUG_ON(!memcg_kmem_cache_wq); |
Vladimir Davydov | 13583c3 | 2016-12-12 16:41:29 -0800 | [diff] [blame] | 5940 | #endif |
| 5941 | |
Sebastian Andrzej Siewior | 308167f | 2016-11-03 15:49:59 +0100 | [diff] [blame] | 5942 | cpuhp_setup_state_nocalls(CPUHP_MM_MEMCQ_DEAD, "mm/memctrl:dead", NULL, |
| 5943 | memcg_hotplug_cpu_dead); |
Johannes Weiner | 95a045f | 2015-02-11 15:26:33 -0800 | [diff] [blame] | 5944 | |
| 5945 | for_each_possible_cpu(cpu) |
| 5946 | INIT_WORK(&per_cpu_ptr(&memcg_stock, cpu)->work, |
| 5947 | drain_local_stock); |
| 5948 | |
| 5949 | for_each_node(node) { |
| 5950 | struct mem_cgroup_tree_per_node *rtpn; |
Johannes Weiner | 95a045f | 2015-02-11 15:26:33 -0800 | [diff] [blame] | 5951 | |
| 5952 | rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, |
| 5953 | node_online(node) ? node : NUMA_NO_NODE); |
| 5954 | |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 5955 | rtpn->rb_root = RB_ROOT; |
Davidlohr Bueso | fa90b2f | 2017-09-08 16:15:21 -0700 | [diff] [blame] | 5956 | rtpn->rb_rightmost = NULL; |
Mel Gorman | ef8f232 | 2016-07-28 15:46:05 -0700 | [diff] [blame] | 5957 | spin_lock_init(&rtpn->lock); |
Johannes Weiner | 95a045f | 2015-02-11 15:26:33 -0800 | [diff] [blame] | 5958 | soft_limit_tree.rb_tree_per_node[node] = rtpn; |
| 5959 | } |
| 5960 | |
Michal Hocko | 2d11085 | 2013-02-22 16:34:43 -0800 | [diff] [blame] | 5961 | return 0; |
| 5962 | } |
| 5963 | subsys_initcall(mem_cgroup_init); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 5964 | |
| 5965 | #ifdef CONFIG_MEMCG_SWAP |
Arnd Bergmann | 358c07f | 2016-08-25 15:17:08 -0700 | [diff] [blame] | 5966 | static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg) |
| 5967 | { |
| 5968 | while (!atomic_inc_not_zero(&memcg->id.ref)) { |
| 5969 | /* |
| 5970 | * The root cgroup cannot be destroyed, so it's refcount must |
| 5971 | * always be >= 1. |
| 5972 | */ |
| 5973 | if (WARN_ON_ONCE(memcg == root_mem_cgroup)) { |
| 5974 | VM_BUG_ON(1); |
| 5975 | break; |
| 5976 | } |
| 5977 | memcg = parent_mem_cgroup(memcg); |
| 5978 | if (!memcg) |
| 5979 | memcg = root_mem_cgroup; |
| 5980 | } |
| 5981 | return memcg; |
| 5982 | } |
| 5983 | |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 5984 | /** |
| 5985 | * mem_cgroup_swapout - transfer a memsw charge to swap |
| 5986 | * @page: page whose memsw charge to transfer |
| 5987 | * @entry: swap entry to move the charge to |
| 5988 | * |
| 5989 | * Transfer the memsw charge of @page to @entry. |
| 5990 | */ |
| 5991 | void mem_cgroup_swapout(struct page *page, swp_entry_t entry) |
| 5992 | { |
Vladimir Davydov | 1f47b61 | 2016-08-11 15:33:00 -0700 | [diff] [blame] | 5993 | struct mem_cgroup *memcg, *swap_memcg; |
Huang Ying | d6810d7 | 2017-09-06 16:22:45 -0700 | [diff] [blame] | 5994 | unsigned int nr_entries; |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 5995 | unsigned short oldid; |
| 5996 | |
| 5997 | VM_BUG_ON_PAGE(PageLRU(page), page); |
| 5998 | VM_BUG_ON_PAGE(page_count(page), page); |
| 5999 | |
Johannes Weiner | 7941d21 | 2016-01-14 15:21:23 -0800 | [diff] [blame] | 6000 | if (!do_memsw_account()) |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6001 | return; |
| 6002 | |
| 6003 | memcg = page->mem_cgroup; |
| 6004 | |
| 6005 | /* Readahead page, never charged */ |
| 6006 | if (!memcg) |
| 6007 | return; |
| 6008 | |
Vladimir Davydov | 1f47b61 | 2016-08-11 15:33:00 -0700 | [diff] [blame] | 6009 | /* |
| 6010 | * In case the memcg owning these pages has been offlined and doesn't |
| 6011 | * have an ID allocated to it anymore, charge the closest online |
| 6012 | * ancestor for the swap instead and transfer the memory+swap charge. |
| 6013 | */ |
| 6014 | swap_memcg = mem_cgroup_id_get_online(memcg); |
Huang Ying | d6810d7 | 2017-09-06 16:22:45 -0700 | [diff] [blame] | 6015 | nr_entries = hpage_nr_pages(page); |
| 6016 | /* Get references for the tail pages, too */ |
| 6017 | if (nr_entries > 1) |
| 6018 | mem_cgroup_id_get_many(swap_memcg, nr_entries - 1); |
| 6019 | oldid = swap_cgroup_record(entry, mem_cgroup_id(swap_memcg), |
| 6020 | nr_entries); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6021 | VM_BUG_ON_PAGE(oldid, page); |
Huang Ying | d6810d7 | 2017-09-06 16:22:45 -0700 | [diff] [blame] | 6022 | mem_cgroup_swap_statistics(swap_memcg, nr_entries); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6023 | |
| 6024 | page->mem_cgroup = NULL; |
| 6025 | |
| 6026 | if (!mem_cgroup_is_root(memcg)) |
Huang Ying | d6810d7 | 2017-09-06 16:22:45 -0700 | [diff] [blame] | 6027 | page_counter_uncharge(&memcg->memory, nr_entries); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6028 | |
Vladimir Davydov | 1f47b61 | 2016-08-11 15:33:00 -0700 | [diff] [blame] | 6029 | if (memcg != swap_memcg) { |
| 6030 | if (!mem_cgroup_is_root(swap_memcg)) |
Huang Ying | d6810d7 | 2017-09-06 16:22:45 -0700 | [diff] [blame] | 6031 | page_counter_charge(&swap_memcg->memsw, nr_entries); |
| 6032 | page_counter_uncharge(&memcg->memsw, nr_entries); |
Vladimir Davydov | 1f47b61 | 2016-08-11 15:33:00 -0700 | [diff] [blame] | 6033 | } |
| 6034 | |
Sebastian Andrzej Siewior | ce9ce66 | 2015-09-04 15:47:50 -0700 | [diff] [blame] | 6035 | /* |
| 6036 | * Interrupts should be disabled here because the caller holds the |
| 6037 | * mapping->tree_lock lock which is taken with interrupts-off. It is |
| 6038 | * important here to have the interrupts disabled because it is the |
| 6039 | * only synchronisation we have for udpating the per-CPU variables. |
| 6040 | */ |
| 6041 | VM_BUG_ON(!irqs_disabled()); |
Huang Ying | d6810d7 | 2017-09-06 16:22:45 -0700 | [diff] [blame] | 6042 | mem_cgroup_charge_statistics(memcg, page, PageTransHuge(page), |
| 6043 | -nr_entries); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6044 | memcg_check_events(memcg, page); |
Johannes Weiner | 73f576c | 2016-07-20 15:44:57 -0700 | [diff] [blame] | 6045 | |
| 6046 | if (!mem_cgroup_is_root(memcg)) |
| 6047 | css_put(&memcg->css); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6048 | } |
| 6049 | |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6050 | /** |
| 6051 | * mem_cgroup_try_charge_swap - try charging swap space for a page |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6052 | * @page: page being added to swap |
| 6053 | * @entry: swap entry to charge |
| 6054 | * |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6055 | * Try to charge @page's memcg for the swap space at @entry. |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6056 | * |
| 6057 | * Returns 0 on success, -ENOMEM on failure. |
| 6058 | */ |
| 6059 | int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry) |
| 6060 | { |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6061 | unsigned int nr_pages = hpage_nr_pages(page); |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6062 | struct page_counter *counter; |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6063 | struct mem_cgroup *memcg; |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6064 | unsigned short oldid; |
| 6065 | |
| 6066 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) || !do_swap_account) |
| 6067 | return 0; |
| 6068 | |
| 6069 | memcg = page->mem_cgroup; |
| 6070 | |
| 6071 | /* Readahead page, never charged */ |
| 6072 | if (!memcg) |
| 6073 | return 0; |
| 6074 | |
Vladimir Davydov | 1f47b61 | 2016-08-11 15:33:00 -0700 | [diff] [blame] | 6075 | memcg = mem_cgroup_id_get_online(memcg); |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6076 | |
Vladimir Davydov | 1f47b61 | 2016-08-11 15:33:00 -0700 | [diff] [blame] | 6077 | if (!mem_cgroup_is_root(memcg) && |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6078 | !page_counter_try_charge(&memcg->swap, nr_pages, &counter)) { |
Vladimir Davydov | 1f47b61 | 2016-08-11 15:33:00 -0700 | [diff] [blame] | 6079 | mem_cgroup_id_put(memcg); |
| 6080 | return -ENOMEM; |
| 6081 | } |
| 6082 | |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6083 | /* Get references for the tail pages, too */ |
| 6084 | if (nr_pages > 1) |
| 6085 | mem_cgroup_id_get_many(memcg, nr_pages - 1); |
| 6086 | oldid = swap_cgroup_record(entry, mem_cgroup_id(memcg), nr_pages); |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6087 | VM_BUG_ON_PAGE(oldid, page); |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6088 | mem_cgroup_swap_statistics(memcg, nr_pages); |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6089 | |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6090 | return 0; |
| 6091 | } |
| 6092 | |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6093 | /** |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6094 | * mem_cgroup_uncharge_swap - uncharge swap space |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6095 | * @entry: swap entry to uncharge |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6096 | * @nr_pages: the amount of swap space to uncharge |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6097 | */ |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6098 | void mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages) |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6099 | { |
| 6100 | struct mem_cgroup *memcg; |
| 6101 | unsigned short id; |
| 6102 | |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6103 | if (!do_swap_account) |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6104 | return; |
| 6105 | |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6106 | id = swap_cgroup_record(entry, 0, nr_pages); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6107 | rcu_read_lock(); |
Vladimir Davydov | adbe427 | 2015-04-15 16:13:00 -0700 | [diff] [blame] | 6108 | memcg = mem_cgroup_from_id(id); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6109 | if (memcg) { |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6110 | if (!mem_cgroup_is_root(memcg)) { |
| 6111 | if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6112 | page_counter_uncharge(&memcg->swap, nr_pages); |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6113 | else |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6114 | page_counter_uncharge(&memcg->memsw, nr_pages); |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6115 | } |
Huang Ying | 38d8b4e | 2017-07-06 15:37:18 -0700 | [diff] [blame] | 6116 | mem_cgroup_swap_statistics(memcg, -nr_pages); |
| 6117 | mem_cgroup_id_put_many(memcg, nr_pages); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6118 | } |
| 6119 | rcu_read_unlock(); |
| 6120 | } |
| 6121 | |
Vladimir Davydov | d8b3843 | 2016-01-20 15:03:07 -0800 | [diff] [blame] | 6122 | long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg) |
| 6123 | { |
| 6124 | long nr_swap_pages = get_nr_swap_pages(); |
| 6125 | |
| 6126 | if (!do_swap_account || !cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
| 6127 | return nr_swap_pages; |
| 6128 | for (; memcg != root_mem_cgroup; memcg = parent_mem_cgroup(memcg)) |
| 6129 | nr_swap_pages = min_t(long, nr_swap_pages, |
| 6130 | READ_ONCE(memcg->swap.limit) - |
| 6131 | page_counter_read(&memcg->swap)); |
| 6132 | return nr_swap_pages; |
| 6133 | } |
| 6134 | |
Vladimir Davydov | 5ccc5ab | 2016-01-20 15:03:10 -0800 | [diff] [blame] | 6135 | bool mem_cgroup_swap_full(struct page *page) |
| 6136 | { |
| 6137 | struct mem_cgroup *memcg; |
| 6138 | |
| 6139 | VM_BUG_ON_PAGE(!PageLocked(page), page); |
| 6140 | |
| 6141 | if (vm_swap_full()) |
| 6142 | return true; |
| 6143 | if (!do_swap_account || !cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
| 6144 | return false; |
| 6145 | |
| 6146 | memcg = page->mem_cgroup; |
| 6147 | if (!memcg) |
| 6148 | return false; |
| 6149 | |
| 6150 | for (; memcg != root_mem_cgroup; memcg = parent_mem_cgroup(memcg)) |
| 6151 | if (page_counter_read(&memcg->swap) * 2 >= memcg->swap.limit) |
| 6152 | return true; |
| 6153 | |
| 6154 | return false; |
| 6155 | } |
| 6156 | |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6157 | /* for remember boot option*/ |
| 6158 | #ifdef CONFIG_MEMCG_SWAP_ENABLED |
| 6159 | static int really_do_swap_account __initdata = 1; |
| 6160 | #else |
| 6161 | static int really_do_swap_account __initdata; |
| 6162 | #endif |
| 6163 | |
| 6164 | static int __init enable_swap_account(char *s) |
| 6165 | { |
| 6166 | if (!strcmp(s, "1")) |
| 6167 | really_do_swap_account = 1; |
| 6168 | else if (!strcmp(s, "0")) |
| 6169 | really_do_swap_account = 0; |
| 6170 | return 1; |
| 6171 | } |
| 6172 | __setup("swapaccount=", enable_swap_account); |
| 6173 | |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6174 | static u64 swap_current_read(struct cgroup_subsys_state *css, |
| 6175 | struct cftype *cft) |
| 6176 | { |
| 6177 | struct mem_cgroup *memcg = mem_cgroup_from_css(css); |
| 6178 | |
| 6179 | return (u64)page_counter_read(&memcg->swap) * PAGE_SIZE; |
| 6180 | } |
| 6181 | |
| 6182 | static int swap_max_show(struct seq_file *m, void *v) |
| 6183 | { |
| 6184 | struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); |
| 6185 | unsigned long max = READ_ONCE(memcg->swap.limit); |
| 6186 | |
| 6187 | if (max == PAGE_COUNTER_MAX) |
| 6188 | seq_puts(m, "max\n"); |
| 6189 | else |
| 6190 | seq_printf(m, "%llu\n", (u64)max * PAGE_SIZE); |
| 6191 | |
| 6192 | return 0; |
| 6193 | } |
| 6194 | |
| 6195 | static ssize_t swap_max_write(struct kernfs_open_file *of, |
| 6196 | char *buf, size_t nbytes, loff_t off) |
| 6197 | { |
| 6198 | struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); |
| 6199 | unsigned long max; |
| 6200 | int err; |
| 6201 | |
| 6202 | buf = strstrip(buf); |
| 6203 | err = page_counter_memparse(buf, "max", &max); |
| 6204 | if (err) |
| 6205 | return err; |
| 6206 | |
| 6207 | mutex_lock(&memcg_limit_mutex); |
| 6208 | err = page_counter_limit(&memcg->swap, max); |
| 6209 | mutex_unlock(&memcg_limit_mutex); |
| 6210 | if (err) |
| 6211 | return err; |
| 6212 | |
| 6213 | return nbytes; |
| 6214 | } |
| 6215 | |
| 6216 | static struct cftype swap_files[] = { |
| 6217 | { |
| 6218 | .name = "swap.current", |
| 6219 | .flags = CFTYPE_NOT_ON_ROOT, |
| 6220 | .read_u64 = swap_current_read, |
| 6221 | }, |
| 6222 | { |
| 6223 | .name = "swap.max", |
| 6224 | .flags = CFTYPE_NOT_ON_ROOT, |
| 6225 | .seq_show = swap_max_show, |
| 6226 | .write = swap_max_write, |
| 6227 | }, |
| 6228 | { } /* terminate */ |
| 6229 | }; |
| 6230 | |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6231 | static struct cftype memsw_cgroup_files[] = { |
| 6232 | { |
| 6233 | .name = "memsw.usage_in_bytes", |
| 6234 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE), |
| 6235 | .read_u64 = mem_cgroup_read_u64, |
| 6236 | }, |
| 6237 | { |
| 6238 | .name = "memsw.max_usage_in_bytes", |
| 6239 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE), |
| 6240 | .write = mem_cgroup_reset, |
| 6241 | .read_u64 = mem_cgroup_read_u64, |
| 6242 | }, |
| 6243 | { |
| 6244 | .name = "memsw.limit_in_bytes", |
| 6245 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT), |
| 6246 | .write = mem_cgroup_write, |
| 6247 | .read_u64 = mem_cgroup_read_u64, |
| 6248 | }, |
| 6249 | { |
| 6250 | .name = "memsw.failcnt", |
| 6251 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT), |
| 6252 | .write = mem_cgroup_reset, |
| 6253 | .read_u64 = mem_cgroup_read_u64, |
| 6254 | }, |
| 6255 | { }, /* terminate */ |
| 6256 | }; |
| 6257 | |
| 6258 | static int __init mem_cgroup_swap_init(void) |
| 6259 | { |
| 6260 | if (!mem_cgroup_disabled() && really_do_swap_account) { |
| 6261 | do_swap_account = 1; |
Vladimir Davydov | 37e8435 | 2016-01-20 15:02:56 -0800 | [diff] [blame] | 6262 | WARN_ON(cgroup_add_dfl_cftypes(&memory_cgrp_subsys, |
| 6263 | swap_files)); |
Johannes Weiner | 21afa38 | 2015-02-11 15:26:36 -0800 | [diff] [blame] | 6264 | WARN_ON(cgroup_add_legacy_cftypes(&memory_cgrp_subsys, |
| 6265 | memsw_cgroup_files)); |
| 6266 | } |
| 6267 | return 0; |
| 6268 | } |
| 6269 | subsys_initcall(mem_cgroup_swap_init); |
| 6270 | |
| 6271 | #endif /* CONFIG_MEMCG_SWAP */ |