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 | * |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/res_counter.h> |
| 21 | #include <linux/memcontrol.h> |
| 22 | #include <linux/cgroup.h> |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 23 | #include <linux/mm.h> |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 24 | #include <linux/pagemap.h> |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 25 | #include <linux/smp.h> |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 26 | #include <linux/page-flags.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 27 | #include <linux/backing-dev.h> |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 28 | #include <linux/bit_spinlock.h> |
| 29 | #include <linux/rcupdate.h> |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 30 | #include <linux/mutex.h> |
Balbir Singh | b6ac57d | 2008-04-29 01:00:19 -0700 | [diff] [blame] | 31 | #include <linux/slab.h> |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 32 | #include <linux/swap.h> |
| 33 | #include <linux/spinlock.h> |
| 34 | #include <linux/fs.h> |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 35 | #include <linux/seq_file.h> |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 36 | #include <linux/vmalloc.h> |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 37 | #include <linux/mm_inline.h> |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 38 | #include <linux/page_cgroup.h> |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 39 | #include "internal.h" |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 40 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 41 | #include <asm/uaccess.h> |
| 42 | |
KAMEZAWA Hiroyuki | a181b0e | 2008-07-25 01:47:08 -0700 | [diff] [blame] | 43 | struct cgroup_subsys mem_cgroup_subsys __read_mostly; |
KAMEZAWA Hiroyuki | a181b0e | 2008-07-25 01:47:08 -0700 | [diff] [blame] | 44 | #define MEM_CGROUP_RECLAIM_RETRIES 5 |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 45 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 46 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 47 | /* Turned on only when memory cgroup is enabled && really_do_swap_account = 0 */ |
| 48 | int do_swap_account __read_mostly; |
| 49 | static int really_do_swap_account __initdata = 1; /* for remember boot option*/ |
| 50 | #else |
| 51 | #define do_swap_account (0) |
| 52 | #endif |
| 53 | |
| 54 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 55 | /* |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 56 | * Statistics for memory cgroup. |
| 57 | */ |
| 58 | enum mem_cgroup_stat_index { |
| 59 | /* |
| 60 | * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss. |
| 61 | */ |
| 62 | MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */ |
| 63 | MEM_CGROUP_STAT_RSS, /* # of pages charged as rss */ |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 64 | MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */ |
| 65 | MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */ |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 66 | |
| 67 | MEM_CGROUP_STAT_NSTATS, |
| 68 | }; |
| 69 | |
| 70 | struct mem_cgroup_stat_cpu { |
| 71 | s64 count[MEM_CGROUP_STAT_NSTATS]; |
| 72 | } ____cacheline_aligned_in_smp; |
| 73 | |
| 74 | struct mem_cgroup_stat { |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 75 | struct mem_cgroup_stat_cpu cpustat[0]; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 76 | }; |
| 77 | |
| 78 | /* |
| 79 | * For accounting under irq disable, no need for increment preempt count. |
| 80 | */ |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 81 | static inline void __mem_cgroup_stat_add_safe(struct mem_cgroup_stat_cpu *stat, |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 82 | enum mem_cgroup_stat_index idx, int val) |
| 83 | { |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 84 | stat->count[idx] += val; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static s64 mem_cgroup_read_stat(struct mem_cgroup_stat *stat, |
| 88 | enum mem_cgroup_stat_index idx) |
| 89 | { |
| 90 | int cpu; |
| 91 | s64 ret = 0; |
| 92 | for_each_possible_cpu(cpu) |
| 93 | ret += stat->cpustat[cpu].count[idx]; |
| 94 | return ret; |
| 95 | } |
| 96 | |
| 97 | /* |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 98 | * per-zone information in memory controller. |
| 99 | */ |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 100 | struct mem_cgroup_per_zone { |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 101 | /* |
| 102 | * spin_lock to protect the per cgroup LRU |
| 103 | */ |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 104 | struct list_head lists[NR_LRU_LISTS]; |
| 105 | unsigned long count[NR_LRU_LISTS]; |
KOSAKI Motohiro | 3e2f41f | 2009-01-07 18:08:20 -0800 | [diff] [blame] | 106 | |
| 107 | struct zone_reclaim_stat reclaim_stat; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 108 | }; |
| 109 | /* Macro for accessing counter */ |
| 110 | #define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)]) |
| 111 | |
| 112 | struct mem_cgroup_per_node { |
| 113 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; |
| 114 | }; |
| 115 | |
| 116 | struct mem_cgroup_lru_info { |
| 117 | struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES]; |
| 118 | }; |
| 119 | |
| 120 | /* |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 121 | * The memory controller data structure. The memory controller controls both |
| 122 | * page cache and RSS per cgroup. We would eventually like to provide |
| 123 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, |
| 124 | * to help the administrator determine what knobs to tune. |
| 125 | * |
| 126 | * TODO: Add a water mark for the memory controller. Reclaim will begin when |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 127 | * we hit the water mark. May be even add a low water mark, such that |
| 128 | * no reclaim occurs from a cgroup at it's low water mark, this is |
| 129 | * a feature that will be implemented much later in the future. |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 130 | */ |
| 131 | struct mem_cgroup { |
| 132 | struct cgroup_subsys_state css; |
| 133 | /* |
| 134 | * the counter to account for memory usage |
| 135 | */ |
| 136 | struct res_counter res; |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 137 | /* |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 138 | * the counter to account for mem+swap usage. |
| 139 | */ |
| 140 | struct res_counter memsw; |
| 141 | /* |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 142 | * Per cgroup active and inactive list, similar to the |
| 143 | * per zone LRU lists. |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 144 | */ |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 145 | struct mem_cgroup_lru_info info; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 146 | |
KOSAKI Motohiro | 2733c06 | 2009-01-07 18:08:23 -0800 | [diff] [blame] | 147 | /* |
| 148 | protect against reclaim related member. |
| 149 | */ |
| 150 | spinlock_t reclaim_param_lock; |
| 151 | |
KAMEZAWA Hiroyuki | 6c48a1d | 2008-02-07 00:14:34 -0800 | [diff] [blame] | 152 | int prev_priority; /* for recording reclaim priority */ |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 153 | |
| 154 | /* |
| 155 | * While reclaiming in a hiearchy, we cache the last child we |
| 156 | * reclaimed from. Protected by cgroup_lock() |
| 157 | */ |
| 158 | struct mem_cgroup *last_scanned_child; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 159 | /* |
| 160 | * Should the accounting and control be hierarchical, per subtree? |
| 161 | */ |
| 162 | bool use_hierarchy; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 163 | unsigned long last_oom_jiffies; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 164 | int obsolete; |
| 165 | atomic_t refcnt; |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 166 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 167 | unsigned int swappiness; |
| 168 | |
| 169 | |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 170 | unsigned int inactive_ratio; |
| 171 | |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 172 | /* |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 173 | * statistics. This must be placed at the end of memcg. |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 174 | */ |
| 175 | struct mem_cgroup_stat stat; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 176 | }; |
| 177 | |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 178 | enum charge_type { |
| 179 | MEM_CGROUP_CHARGE_TYPE_CACHE = 0, |
| 180 | MEM_CGROUP_CHARGE_TYPE_MAPPED, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 181 | MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */ |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 182 | MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */ |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 183 | MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */ |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 184 | NR_CHARGE_TYPE, |
| 185 | }; |
| 186 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 187 | /* only for here (for easy reading.) */ |
| 188 | #define PCGF_CACHE (1UL << PCG_CACHE) |
| 189 | #define PCGF_USED (1UL << PCG_USED) |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 190 | #define PCGF_LOCK (1UL << PCG_LOCK) |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 191 | static const unsigned long |
| 192 | pcg_default_flags[NR_CHARGE_TYPE] = { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 193 | PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* File Cache */ |
| 194 | PCGF_USED | PCGF_LOCK, /* Anon */ |
| 195 | PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* Shmem */ |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 196 | 0, /* FORCE */ |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 197 | }; |
| 198 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 199 | /* for encoding cft->private value on file */ |
| 200 | #define _MEM (0) |
| 201 | #define _MEMSWAP (1) |
| 202 | #define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
| 203 | #define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff) |
| 204 | #define MEMFILE_ATTR(val) ((val) & 0xffff) |
| 205 | |
| 206 | static void mem_cgroup_get(struct mem_cgroup *mem); |
| 207 | static void mem_cgroup_put(struct mem_cgroup *mem); |
| 208 | |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 209 | static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, |
| 210 | struct page_cgroup *pc, |
| 211 | bool charge) |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 212 | { |
| 213 | int val = (charge)? 1 : -1; |
| 214 | struct mem_cgroup_stat *stat = &mem->stat; |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 215 | struct mem_cgroup_stat_cpu *cpustat; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 216 | int cpu = get_cpu(); |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 217 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 218 | cpustat = &stat->cpustat[cpu]; |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 219 | if (PageCgroupCache(pc)) |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 220 | __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_CACHE, val); |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 221 | else |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 222 | __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_RSS, val); |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 223 | |
| 224 | if (charge) |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 225 | __mem_cgroup_stat_add_safe(cpustat, |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 226 | MEM_CGROUP_STAT_PGPGIN_COUNT, 1); |
| 227 | else |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 228 | __mem_cgroup_stat_add_safe(cpustat, |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 229 | MEM_CGROUP_STAT_PGPGOUT_COUNT, 1); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 230 | put_cpu(); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 231 | } |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 232 | |
Hugh Dickins | d5b69e3 | 2008-03-04 14:29:10 -0800 | [diff] [blame] | 233 | static struct mem_cgroup_per_zone * |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 234 | mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid) |
| 235 | { |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 236 | return &mem->info.nodeinfo[nid]->zoneinfo[zid]; |
| 237 | } |
| 238 | |
Hugh Dickins | d5b69e3 | 2008-03-04 14:29:10 -0800 | [diff] [blame] | 239 | static struct mem_cgroup_per_zone * |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 240 | page_cgroup_zoneinfo(struct page_cgroup *pc) |
| 241 | { |
| 242 | struct mem_cgroup *mem = pc->mem_cgroup; |
| 243 | int nid = page_cgroup_nid(pc); |
| 244 | int zid = page_cgroup_zid(pc); |
| 245 | |
KOSAKI Motohiro | 5499276 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 246 | if (!mem) |
| 247 | return NULL; |
| 248 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 249 | return mem_cgroup_zoneinfo(mem, nid, zid); |
| 250 | } |
| 251 | |
| 252 | static unsigned long mem_cgroup_get_all_zonestat(struct mem_cgroup *mem, |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 253 | enum lru_list idx) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 254 | { |
| 255 | int nid, zid; |
| 256 | struct mem_cgroup_per_zone *mz; |
| 257 | u64 total = 0; |
| 258 | |
| 259 | for_each_online_node(nid) |
| 260 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { |
| 261 | mz = mem_cgroup_zoneinfo(mem, nid, zid); |
| 262 | total += MEM_CGROUP_ZSTAT(mz, idx); |
| 263 | } |
| 264 | return total; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 265 | } |
| 266 | |
Hugh Dickins | d5b69e3 | 2008-03-04 14:29:10 -0800 | [diff] [blame] | 267 | static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 268 | { |
| 269 | return container_of(cgroup_subsys_state(cont, |
| 270 | mem_cgroup_subsys_id), struct mem_cgroup, |
| 271 | css); |
| 272 | } |
| 273 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 274 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 275 | { |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 276 | /* |
| 277 | * mm_update_next_owner() may clear mm->owner to NULL |
| 278 | * if it races with swapoff, page migration, etc. |
| 279 | * So this can be called with p == NULL. |
| 280 | */ |
| 281 | if (unlikely(!p)) |
| 282 | return NULL; |
| 283 | |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 284 | return container_of(task_subsys_state(p, mem_cgroup_subsys_id), |
| 285 | struct mem_cgroup, css); |
| 286 | } |
| 287 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 288 | /* |
| 289 | * Following LRU functions are allowed to be used without PCG_LOCK. |
| 290 | * Operations are called by routine of global LRU independently from memcg. |
| 291 | * What we have to take care of here is validness of pc->mem_cgroup. |
| 292 | * |
| 293 | * Changes to pc->mem_cgroup happens when |
| 294 | * 1. charge |
| 295 | * 2. moving account |
| 296 | * In typical case, "charge" is done before add-to-lru. Exception is SwapCache. |
| 297 | * It is added to LRU before charge. |
| 298 | * If PCG_USED bit is not set, page_cgroup is not added to this private LRU. |
| 299 | * When moving account, the page is not on LRU. It's isolated. |
| 300 | */ |
| 301 | |
| 302 | void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 303 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 304 | struct page_cgroup *pc; |
| 305 | struct mem_cgroup *mem; |
| 306 | struct mem_cgroup_per_zone *mz; |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 307 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 308 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 309 | return; |
| 310 | pc = lookup_page_cgroup(page); |
| 311 | /* can happen while we handle swapcache. */ |
| 312 | if (list_empty(&pc->lru)) |
| 313 | return; |
| 314 | mz = page_cgroup_zoneinfo(pc); |
| 315 | mem = pc->mem_cgroup; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 316 | MEM_CGROUP_ZSTAT(mz, lru) -= 1; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 317 | list_del_init(&pc->lru); |
| 318 | return; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 319 | } |
| 320 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 321 | void mem_cgroup_del_lru(struct page *page) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 322 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 323 | mem_cgroup_del_lru_list(page, page_lru(page)); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 324 | } |
| 325 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 326 | void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru) |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 327 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 328 | struct mem_cgroup_per_zone *mz; |
| 329 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 330 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 331 | if (mem_cgroup_disabled()) |
Lee Schermerhorn | 894bc31 | 2008-10-18 20:26:39 -0700 | [diff] [blame] | 332 | return; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 333 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 334 | pc = lookup_page_cgroup(page); |
| 335 | smp_rmb(); |
| 336 | /* unused page is not rotated. */ |
| 337 | if (!PageCgroupUsed(pc)) |
| 338 | return; |
| 339 | mz = page_cgroup_zoneinfo(pc); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 340 | list_move(&pc->lru, &mz->lists[lru]); |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 341 | } |
| 342 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 343 | void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru) |
| 344 | { |
| 345 | struct page_cgroup *pc; |
| 346 | struct mem_cgroup_per_zone *mz; |
| 347 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 348 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 349 | return; |
| 350 | pc = lookup_page_cgroup(page); |
| 351 | /* barrier to sync with "charge" */ |
| 352 | smp_rmb(); |
| 353 | if (!PageCgroupUsed(pc)) |
| 354 | return; |
| 355 | |
| 356 | mz = page_cgroup_zoneinfo(pc); |
| 357 | MEM_CGROUP_ZSTAT(mz, lru) += 1; |
| 358 | list_add(&pc->lru, &mz->lists[lru]); |
| 359 | } |
| 360 | /* |
| 361 | * To add swapcache into LRU. Be careful to all this function. |
| 362 | * zone->lru_lock shouldn't be held and irq must not be disabled. |
| 363 | */ |
| 364 | static void mem_cgroup_lru_fixup(struct page *page) |
| 365 | { |
| 366 | if (!isolate_lru_page(page)) |
| 367 | putback_lru_page(page); |
| 368 | } |
| 369 | |
| 370 | void mem_cgroup_move_lists(struct page *page, |
| 371 | enum lru_list from, enum lru_list to) |
| 372 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 373 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 374 | return; |
| 375 | mem_cgroup_del_lru_list(page, from); |
| 376 | mem_cgroup_add_lru_list(page, to); |
| 377 | } |
| 378 | |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 379 | int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem) |
| 380 | { |
| 381 | int ret; |
| 382 | |
| 383 | task_lock(task); |
Hugh Dickins | bd845e3 | 2008-03-04 14:29:01 -0800 | [diff] [blame] | 384 | ret = task->mm && mm_match_cgroup(task->mm, mem); |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 385 | task_unlock(task); |
| 386 | return ret; |
| 387 | } |
| 388 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 389 | /* |
KAMEZAWA Hiroyuki | 58ae83d | 2008-02-07 00:14:32 -0800 | [diff] [blame] | 390 | * Calculate mapped_ratio under memory controller. This will be used in |
| 391 | * vmscan.c for deteremining we have to reclaim mapped pages. |
| 392 | */ |
| 393 | int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem) |
| 394 | { |
| 395 | long total, rss; |
| 396 | |
| 397 | /* |
| 398 | * usage is recorded in bytes. But, here, we assume the number of |
| 399 | * physical pages can be represented by "long" on any arch. |
| 400 | */ |
| 401 | total = (long) (mem->res.usage >> PAGE_SHIFT) + 1L; |
| 402 | rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS); |
| 403 | return (int)((rss * 100L) / total); |
| 404 | } |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 405 | |
KAMEZAWA Hiroyuki | 5932f36 | 2008-02-07 00:14:33 -0800 | [diff] [blame] | 406 | /* |
KAMEZAWA Hiroyuki | 6c48a1d | 2008-02-07 00:14:34 -0800 | [diff] [blame] | 407 | * prev_priority control...this will be used in memory reclaim path. |
| 408 | */ |
| 409 | int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) |
| 410 | { |
KOSAKI Motohiro | 2733c06 | 2009-01-07 18:08:23 -0800 | [diff] [blame] | 411 | int prev_priority; |
| 412 | |
| 413 | spin_lock(&mem->reclaim_param_lock); |
| 414 | prev_priority = mem->prev_priority; |
| 415 | spin_unlock(&mem->reclaim_param_lock); |
| 416 | |
| 417 | return prev_priority; |
KAMEZAWA Hiroyuki | 6c48a1d | 2008-02-07 00:14:34 -0800 | [diff] [blame] | 418 | } |
| 419 | |
| 420 | void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority) |
| 421 | { |
KOSAKI Motohiro | 2733c06 | 2009-01-07 18:08:23 -0800 | [diff] [blame] | 422 | spin_lock(&mem->reclaim_param_lock); |
KAMEZAWA Hiroyuki | 6c48a1d | 2008-02-07 00:14:34 -0800 | [diff] [blame] | 423 | if (priority < mem->prev_priority) |
| 424 | mem->prev_priority = priority; |
KOSAKI Motohiro | 2733c06 | 2009-01-07 18:08:23 -0800 | [diff] [blame] | 425 | spin_unlock(&mem->reclaim_param_lock); |
KAMEZAWA Hiroyuki | 6c48a1d | 2008-02-07 00:14:34 -0800 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority) |
| 429 | { |
KOSAKI Motohiro | 2733c06 | 2009-01-07 18:08:23 -0800 | [diff] [blame] | 430 | spin_lock(&mem->reclaim_param_lock); |
KAMEZAWA Hiroyuki | 6c48a1d | 2008-02-07 00:14:34 -0800 | [diff] [blame] | 431 | mem->prev_priority = priority; |
KOSAKI Motohiro | 2733c06 | 2009-01-07 18:08:23 -0800 | [diff] [blame] | 432 | spin_unlock(&mem->reclaim_param_lock); |
KAMEZAWA Hiroyuki | 6c48a1d | 2008-02-07 00:14:34 -0800 | [diff] [blame] | 433 | } |
| 434 | |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 435 | int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg, struct zone *zone) |
| 436 | { |
| 437 | unsigned long active; |
| 438 | unsigned long inactive; |
| 439 | |
| 440 | inactive = mem_cgroup_get_all_zonestat(memcg, LRU_INACTIVE_ANON); |
| 441 | active = mem_cgroup_get_all_zonestat(memcg, LRU_ACTIVE_ANON); |
| 442 | |
| 443 | if (inactive * memcg->inactive_ratio < active) |
| 444 | return 1; |
| 445 | |
| 446 | return 0; |
| 447 | } |
| 448 | |
KOSAKI Motohiro | a3d8e05 | 2009-01-07 18:08:19 -0800 | [diff] [blame] | 449 | unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, |
| 450 | struct zone *zone, |
| 451 | enum lru_list lru) |
| 452 | { |
| 453 | int nid = zone->zone_pgdat->node_id; |
| 454 | int zid = zone_idx(zone); |
| 455 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid); |
| 456 | |
| 457 | return MEM_CGROUP_ZSTAT(mz, lru); |
| 458 | } |
| 459 | |
KOSAKI Motohiro | 3e2f41f | 2009-01-07 18:08:20 -0800 | [diff] [blame] | 460 | struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, |
| 461 | struct zone *zone) |
| 462 | { |
| 463 | int nid = zone->zone_pgdat->node_id; |
| 464 | int zid = zone_idx(zone); |
| 465 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid); |
| 466 | |
| 467 | return &mz->reclaim_stat; |
| 468 | } |
| 469 | |
| 470 | struct zone_reclaim_stat * |
| 471 | mem_cgroup_get_reclaim_stat_from_page(struct page *page) |
| 472 | { |
| 473 | struct page_cgroup *pc; |
| 474 | struct mem_cgroup_per_zone *mz; |
| 475 | |
| 476 | if (mem_cgroup_disabled()) |
| 477 | return NULL; |
| 478 | |
| 479 | pc = lookup_page_cgroup(page); |
| 480 | mz = page_cgroup_zoneinfo(pc); |
| 481 | if (!mz) |
| 482 | return NULL; |
| 483 | |
| 484 | return &mz->reclaim_stat; |
| 485 | } |
| 486 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 487 | unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, |
| 488 | struct list_head *dst, |
| 489 | unsigned long *scanned, int order, |
| 490 | int mode, struct zone *z, |
| 491 | struct mem_cgroup *mem_cont, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 492 | int active, int file) |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 493 | { |
| 494 | unsigned long nr_taken = 0; |
| 495 | struct page *page; |
| 496 | unsigned long scan; |
| 497 | LIST_HEAD(pc_list); |
| 498 | struct list_head *src; |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 499 | struct page_cgroup *pc, *tmp; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 500 | int nid = z->zone_pgdat->node_id; |
| 501 | int zid = zone_idx(z); |
| 502 | struct mem_cgroup_per_zone *mz; |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 503 | int lru = LRU_FILE * !!file + !!active; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 504 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 505 | BUG_ON(!mem_cont); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 506 | mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 507 | src = &mz->lists[lru]; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 508 | |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 509 | scan = 0; |
| 510 | list_for_each_entry_safe_reverse(pc, tmp, src, lru) { |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 511 | if (scan >= nr_to_scan) |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 512 | break; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 513 | |
| 514 | page = pc->page; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 515 | if (unlikely(!PageCgroupUsed(pc))) |
| 516 | continue; |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 517 | if (unlikely(!PageLRU(page))) |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 518 | continue; |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 519 | |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 520 | scan++; |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 521 | if (__isolate_lru_page(page, mode, file) == 0) { |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 522 | list_move(&page->lru, dst); |
| 523 | nr_taken++; |
| 524 | } |
| 525 | } |
| 526 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 527 | *scanned = scan; |
| 528 | return nr_taken; |
| 529 | } |
| 530 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 531 | #define mem_cgroup_from_res_counter(counter, member) \ |
| 532 | container_of(counter, struct mem_cgroup, member) |
| 533 | |
| 534 | /* |
| 535 | * This routine finds the DFS walk successor. This routine should be |
| 536 | * called with cgroup_mutex held |
| 537 | */ |
| 538 | static struct mem_cgroup * |
| 539 | mem_cgroup_get_next_node(struct mem_cgroup *curr, struct mem_cgroup *root_mem) |
| 540 | { |
| 541 | struct cgroup *cgroup, *curr_cgroup, *root_cgroup; |
| 542 | |
| 543 | curr_cgroup = curr->css.cgroup; |
| 544 | root_cgroup = root_mem->css.cgroup; |
| 545 | |
| 546 | if (!list_empty(&curr_cgroup->children)) { |
| 547 | /* |
| 548 | * Walk down to children |
| 549 | */ |
| 550 | mem_cgroup_put(curr); |
| 551 | cgroup = list_entry(curr_cgroup->children.next, |
| 552 | struct cgroup, sibling); |
| 553 | curr = mem_cgroup_from_cont(cgroup); |
| 554 | mem_cgroup_get(curr); |
| 555 | goto done; |
| 556 | } |
| 557 | |
| 558 | visit_parent: |
| 559 | if (curr_cgroup == root_cgroup) { |
| 560 | mem_cgroup_put(curr); |
| 561 | curr = root_mem; |
| 562 | mem_cgroup_get(curr); |
| 563 | goto done; |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * Goto next sibling |
| 568 | */ |
| 569 | if (curr_cgroup->sibling.next != &curr_cgroup->parent->children) { |
| 570 | mem_cgroup_put(curr); |
| 571 | cgroup = list_entry(curr_cgroup->sibling.next, struct cgroup, |
| 572 | sibling); |
| 573 | curr = mem_cgroup_from_cont(cgroup); |
| 574 | mem_cgroup_get(curr); |
| 575 | goto done; |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * Go up to next parent and next parent's sibling if need be |
| 580 | */ |
| 581 | curr_cgroup = curr_cgroup->parent; |
| 582 | goto visit_parent; |
| 583 | |
| 584 | done: |
| 585 | root_mem->last_scanned_child = curr; |
| 586 | return curr; |
| 587 | } |
| 588 | |
| 589 | /* |
| 590 | * Visit the first child (need not be the first child as per the ordering |
| 591 | * of the cgroup list, since we track last_scanned_child) of @mem and use |
| 592 | * that to reclaim free pages from. |
| 593 | */ |
| 594 | static struct mem_cgroup * |
| 595 | mem_cgroup_get_first_node(struct mem_cgroup *root_mem) |
| 596 | { |
| 597 | struct cgroup *cgroup; |
| 598 | struct mem_cgroup *ret; |
| 599 | bool obsolete = (root_mem->last_scanned_child && |
| 600 | root_mem->last_scanned_child->obsolete); |
| 601 | |
| 602 | /* |
| 603 | * Scan all children under the mem_cgroup mem |
| 604 | */ |
| 605 | cgroup_lock(); |
| 606 | if (list_empty(&root_mem->css.cgroup->children)) { |
| 607 | ret = root_mem; |
| 608 | goto done; |
| 609 | } |
| 610 | |
| 611 | if (!root_mem->last_scanned_child || obsolete) { |
| 612 | |
| 613 | if (obsolete) |
| 614 | mem_cgroup_put(root_mem->last_scanned_child); |
| 615 | |
| 616 | cgroup = list_first_entry(&root_mem->css.cgroup->children, |
| 617 | struct cgroup, sibling); |
| 618 | ret = mem_cgroup_from_cont(cgroup); |
| 619 | mem_cgroup_get(ret); |
| 620 | } else |
| 621 | ret = mem_cgroup_get_next_node(root_mem->last_scanned_child, |
| 622 | root_mem); |
| 623 | |
| 624 | done: |
| 625 | root_mem->last_scanned_child = ret; |
| 626 | cgroup_unlock(); |
| 627 | return ret; |
| 628 | } |
| 629 | |
Daisuke Nishimura | b85a96c | 2009-01-07 18:08:12 -0800 | [diff] [blame] | 630 | static bool mem_cgroup_check_under_limit(struct mem_cgroup *mem) |
| 631 | { |
| 632 | if (do_swap_account) { |
| 633 | if (res_counter_check_under_limit(&mem->res) && |
| 634 | res_counter_check_under_limit(&mem->memsw)) |
| 635 | return true; |
| 636 | } else |
| 637 | if (res_counter_check_under_limit(&mem->res)) |
| 638 | return true; |
| 639 | return false; |
| 640 | } |
| 641 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 642 | static unsigned int get_swappiness(struct mem_cgroup *memcg) |
| 643 | { |
| 644 | struct cgroup *cgrp = memcg->css.cgroup; |
| 645 | unsigned int swappiness; |
| 646 | |
| 647 | /* root ? */ |
| 648 | if (cgrp->parent == NULL) |
| 649 | return vm_swappiness; |
| 650 | |
| 651 | spin_lock(&memcg->reclaim_param_lock); |
| 652 | swappiness = memcg->swappiness; |
| 653 | spin_unlock(&memcg->reclaim_param_lock); |
| 654 | |
| 655 | return swappiness; |
| 656 | } |
| 657 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 658 | /* |
| 659 | * Dance down the hierarchy if needed to reclaim memory. We remember the |
| 660 | * last child we reclaimed from, so that we don't end up penalizing |
| 661 | * one child extensively based on its position in the children list. |
| 662 | * |
| 663 | * root_mem is the original ancestor that we've been reclaim from. |
| 664 | */ |
| 665 | static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem, |
| 666 | gfp_t gfp_mask, bool noswap) |
| 667 | { |
| 668 | struct mem_cgroup *next_mem; |
| 669 | int ret = 0; |
| 670 | |
| 671 | /* |
| 672 | * Reclaim unconditionally and don't check for return value. |
| 673 | * We need to reclaim in the current group and down the tree. |
| 674 | * One might think about checking for children before reclaiming, |
| 675 | * but there might be left over accounting, even after children |
| 676 | * have left. |
| 677 | */ |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 678 | ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap, |
| 679 | get_swappiness(root_mem)); |
Daisuke Nishimura | b85a96c | 2009-01-07 18:08:12 -0800 | [diff] [blame] | 680 | if (mem_cgroup_check_under_limit(root_mem)) |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 681 | return 0; |
Daisuke Nishimura | 670ec2f | 2009-01-07 18:08:13 -0800 | [diff] [blame] | 682 | if (!root_mem->use_hierarchy) |
| 683 | return ret; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 684 | |
| 685 | next_mem = mem_cgroup_get_first_node(root_mem); |
| 686 | |
| 687 | while (next_mem != root_mem) { |
| 688 | if (next_mem->obsolete) { |
| 689 | mem_cgroup_put(next_mem); |
| 690 | cgroup_lock(); |
| 691 | next_mem = mem_cgroup_get_first_node(root_mem); |
| 692 | cgroup_unlock(); |
| 693 | continue; |
| 694 | } |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 695 | ret = try_to_free_mem_cgroup_pages(next_mem, gfp_mask, noswap, |
| 696 | get_swappiness(next_mem)); |
Daisuke Nishimura | b85a96c | 2009-01-07 18:08:12 -0800 | [diff] [blame] | 697 | if (mem_cgroup_check_under_limit(root_mem)) |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 698 | return 0; |
| 699 | cgroup_lock(); |
| 700 | next_mem = mem_cgroup_get_next_node(next_mem, root_mem); |
| 701 | cgroup_unlock(); |
| 702 | } |
| 703 | return ret; |
| 704 | } |
| 705 | |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 706 | bool mem_cgroup_oom_called(struct task_struct *task) |
| 707 | { |
| 708 | bool ret = false; |
| 709 | struct mem_cgroup *mem; |
| 710 | struct mm_struct *mm; |
| 711 | |
| 712 | rcu_read_lock(); |
| 713 | mm = task->mm; |
| 714 | if (!mm) |
| 715 | mm = &init_mm; |
| 716 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
| 717 | if (mem && time_before(jiffies, mem->last_oom_jiffies + HZ/10)) |
| 718 | ret = true; |
| 719 | rcu_read_unlock(); |
| 720 | return ret; |
| 721 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 722 | /* |
| 723 | * Unlike exported interface, "oom" parameter is added. if oom==true, |
| 724 | * oom-killer can be invoked. |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 725 | */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 726 | static int __mem_cgroup_try_charge(struct mm_struct *mm, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 727 | gfp_t gfp_mask, struct mem_cgroup **memcg, |
| 728 | bool oom) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 729 | { |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 730 | struct mem_cgroup *mem, *mem_over_limit; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 731 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 732 | struct res_counter *fail_res; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 733 | |
| 734 | if (unlikely(test_thread_flag(TIF_MEMDIE))) { |
| 735 | /* Don't account this! */ |
| 736 | *memcg = NULL; |
| 737 | return 0; |
| 738 | } |
| 739 | |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 740 | /* |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 741 | * We always charge the cgroup the mm_struct belongs to. |
| 742 | * The mm_struct's mem_cgroup changes on task migration if the |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 743 | * thread group leader migrates. It's possible that mm is not |
| 744 | * set, if so charge the init_mm (happens for pagecache usage). |
| 745 | */ |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 746 | if (likely(!*memcg)) { |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 747 | rcu_read_lock(); |
| 748 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 749 | if (unlikely(!mem)) { |
| 750 | rcu_read_unlock(); |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 751 | return 0; |
| 752 | } |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 753 | /* |
| 754 | * For every charge from the cgroup, increment reference count |
| 755 | */ |
| 756 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 757 | *memcg = mem; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 758 | rcu_read_unlock(); |
| 759 | } else { |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 760 | mem = *memcg; |
| 761 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 762 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 763 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 764 | while (1) { |
| 765 | int ret; |
| 766 | bool noswap = false; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 767 | |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 768 | ret = res_counter_charge(&mem->res, PAGE_SIZE, &fail_res); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 769 | if (likely(!ret)) { |
| 770 | if (!do_swap_account) |
| 771 | break; |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 772 | ret = res_counter_charge(&mem->memsw, PAGE_SIZE, |
| 773 | &fail_res); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 774 | if (likely(!ret)) |
| 775 | break; |
| 776 | /* mem+swap counter fails */ |
| 777 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
| 778 | noswap = true; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 779 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, |
| 780 | memsw); |
| 781 | } else |
| 782 | /* mem counter fails */ |
| 783 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, |
| 784 | res); |
| 785 | |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 786 | if (!(gfp_mask & __GFP_WAIT)) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 787 | goto nomem; |
Balbir Singh | e1a1cd5 | 2008-02-07 00:14:02 -0800 | [diff] [blame] | 788 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 789 | ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, gfp_mask, |
| 790 | noswap); |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 791 | |
| 792 | /* |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 793 | * try_to_free_mem_cgroup_pages() might not give us a full |
| 794 | * picture of reclaim. Some pages are reclaimed and might be |
| 795 | * moved to swap cache or just unmapped from the cgroup. |
| 796 | * Check the limit again to see if the reclaim reduced the |
| 797 | * current usage of the cgroup before giving up |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 798 | * |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 799 | */ |
Daisuke Nishimura | b85a96c | 2009-01-07 18:08:12 -0800 | [diff] [blame] | 800 | if (mem_cgroup_check_under_limit(mem_over_limit)) |
| 801 | continue; |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 802 | |
| 803 | if (!nr_retries--) { |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 804 | if (oom) { |
KAMEZAWA Hiroyuki | 8870075 | 2009-01-07 18:08:09 -0800 | [diff] [blame] | 805 | mem_cgroup_out_of_memory(mem_over_limit, gfp_mask); |
| 806 | mem_over_limit->last_oom_jiffies = jiffies; |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 807 | } |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 808 | goto nomem; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 809 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 810 | } |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 811 | return 0; |
| 812 | nomem: |
| 813 | css_put(&mem->css); |
| 814 | return -ENOMEM; |
| 815 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 816 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 817 | /** |
| 818 | * mem_cgroup_try_charge - get charge of PAGE_SIZE. |
| 819 | * @mm: an mm_struct which is charged against. (when *memcg is NULL) |
| 820 | * @gfp_mask: gfp_mask for reclaim. |
| 821 | * @memcg: a pointer to memory cgroup which is charged against. |
| 822 | * |
| 823 | * charge against memory cgroup pointed by *memcg. if *memcg == NULL, estimated |
| 824 | * memory cgroup from @mm is got and stored in *memcg. |
| 825 | * |
| 826 | * Returns 0 if success. -ENOMEM at failure. |
| 827 | * This call can invoke OOM-Killer. |
| 828 | */ |
| 829 | |
| 830 | int mem_cgroup_try_charge(struct mm_struct *mm, |
| 831 | gfp_t mask, struct mem_cgroup **memcg) |
| 832 | { |
| 833 | return __mem_cgroup_try_charge(mm, mask, memcg, true); |
| 834 | } |
| 835 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 836 | /* |
| 837 | * commit a charge got by mem_cgroup_try_charge() and makes page_cgroup to be |
| 838 | * USED state. If already USED, uncharge and return. |
| 839 | */ |
| 840 | |
| 841 | static void __mem_cgroup_commit_charge(struct mem_cgroup *mem, |
| 842 | struct page_cgroup *pc, |
| 843 | enum charge_type ctype) |
| 844 | { |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 845 | /* try_charge() can return NULL to *memcg, taking care of it. */ |
| 846 | if (!mem) |
| 847 | return; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 848 | |
| 849 | lock_page_cgroup(pc); |
| 850 | if (unlikely(PageCgroupUsed(pc))) { |
| 851 | unlock_page_cgroup(pc); |
| 852 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 853 | if (do_swap_account) |
| 854 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 855 | css_put(&mem->css); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 856 | return; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 857 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 858 | pc->mem_cgroup = mem; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 859 | smp_wmb(); |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 860 | pc->flags = pcg_default_flags[ctype]; |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 861 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 862 | mem_cgroup_charge_statistics(mem, pc, true); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 863 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 864 | unlock_page_cgroup(pc); |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 865 | } |
| 866 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 867 | /** |
| 868 | * mem_cgroup_move_account - move account of the page |
| 869 | * @pc: page_cgroup of the page. |
| 870 | * @from: mem_cgroup which the page is moved from. |
| 871 | * @to: mem_cgroup which the page is moved to. @from != @to. |
| 872 | * |
| 873 | * The caller must confirm following. |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 874 | * - page is not on LRU (isolate_page() is useful.) |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 875 | * |
| 876 | * returns 0 at success, |
| 877 | * returns -EBUSY when lock is busy or "pc" is unstable. |
| 878 | * |
| 879 | * This function does "uncharge" from old cgroup but doesn't do "charge" to |
| 880 | * new cgroup. It should be done by a caller. |
| 881 | */ |
| 882 | |
| 883 | static int mem_cgroup_move_account(struct page_cgroup *pc, |
| 884 | struct mem_cgroup *from, struct mem_cgroup *to) |
| 885 | { |
| 886 | struct mem_cgroup_per_zone *from_mz, *to_mz; |
| 887 | int nid, zid; |
| 888 | int ret = -EBUSY; |
| 889 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 890 | VM_BUG_ON(from == to); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 891 | VM_BUG_ON(PageLRU(pc->page)); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 892 | |
| 893 | nid = page_cgroup_nid(pc); |
| 894 | zid = page_cgroup_zid(pc); |
| 895 | from_mz = mem_cgroup_zoneinfo(from, nid, zid); |
| 896 | to_mz = mem_cgroup_zoneinfo(to, nid, zid); |
| 897 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 898 | if (!trylock_page_cgroup(pc)) |
| 899 | return ret; |
| 900 | |
| 901 | if (!PageCgroupUsed(pc)) |
| 902 | goto out; |
| 903 | |
| 904 | if (pc->mem_cgroup != from) |
| 905 | goto out; |
| 906 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 907 | css_put(&from->css); |
| 908 | res_counter_uncharge(&from->res, PAGE_SIZE); |
| 909 | mem_cgroup_charge_statistics(from, pc, false); |
| 910 | if (do_swap_account) |
| 911 | res_counter_uncharge(&from->memsw, PAGE_SIZE); |
| 912 | pc->mem_cgroup = to; |
| 913 | mem_cgroup_charge_statistics(to, pc, true); |
| 914 | css_get(&to->css); |
| 915 | ret = 0; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 916 | out: |
| 917 | unlock_page_cgroup(pc); |
| 918 | return ret; |
| 919 | } |
| 920 | |
| 921 | /* |
| 922 | * move charges to its parent. |
| 923 | */ |
| 924 | |
| 925 | static int mem_cgroup_move_parent(struct page_cgroup *pc, |
| 926 | struct mem_cgroup *child, |
| 927 | gfp_t gfp_mask) |
| 928 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 929 | struct page *page = pc->page; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 930 | struct cgroup *cg = child->css.cgroup; |
| 931 | struct cgroup *pcg = cg->parent; |
| 932 | struct mem_cgroup *parent; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 933 | int ret; |
| 934 | |
| 935 | /* Is ROOT ? */ |
| 936 | if (!pcg) |
| 937 | return -EINVAL; |
| 938 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 939 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 940 | parent = mem_cgroup_from_cont(pcg); |
| 941 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 942 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 943 | ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false); |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 944 | if (ret || !parent) |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 945 | return ret; |
| 946 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 947 | if (!get_page_unless_zero(page)) |
| 948 | return -EBUSY; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 949 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 950 | ret = isolate_lru_page(page); |
| 951 | |
| 952 | if (ret) |
| 953 | goto cancel; |
| 954 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 955 | ret = mem_cgroup_move_account(pc, child, parent); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 956 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 957 | /* drop extra refcnt by try_charge() (move_account increment one) */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 958 | css_put(&parent->css); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 959 | putback_lru_page(page); |
| 960 | if (!ret) { |
| 961 | put_page(page); |
| 962 | return 0; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 963 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 964 | /* uncharge if move fails */ |
| 965 | cancel: |
| 966 | res_counter_uncharge(&parent->res, PAGE_SIZE); |
| 967 | if (do_swap_account) |
| 968 | res_counter_uncharge(&parent->memsw, PAGE_SIZE); |
| 969 | put_page(page); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 970 | return ret; |
| 971 | } |
| 972 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 973 | /* |
| 974 | * Charge the memory controller for page usage. |
| 975 | * Return |
| 976 | * 0 if the charge was successful |
| 977 | * < 0 if the cgroup is over its limit |
| 978 | */ |
| 979 | static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, |
| 980 | gfp_t gfp_mask, enum charge_type ctype, |
| 981 | struct mem_cgroup *memcg) |
| 982 | { |
| 983 | struct mem_cgroup *mem; |
| 984 | struct page_cgroup *pc; |
| 985 | int ret; |
| 986 | |
| 987 | pc = lookup_page_cgroup(page); |
| 988 | /* can happen at boot */ |
| 989 | if (unlikely(!pc)) |
| 990 | return 0; |
| 991 | prefetchw(pc); |
| 992 | |
| 993 | mem = memcg; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 994 | ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true); |
KAMEZAWA Hiroyuki | a636b32 | 2009-01-07 18:08:08 -0800 | [diff] [blame] | 995 | if (ret || !mem) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 996 | return ret; |
| 997 | |
| 998 | __mem_cgroup_commit_charge(mem, pc, ctype); |
| 999 | return 0; |
| 1000 | } |
| 1001 | |
| 1002 | int mem_cgroup_newpage_charge(struct page *page, |
| 1003 | struct mm_struct *mm, gfp_t gfp_mask) |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 1004 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1005 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 1006 | return 0; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1007 | if (PageCompound(page)) |
| 1008 | return 0; |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1009 | /* |
| 1010 | * If already mapped, we don't have to account. |
| 1011 | * If page cache, page->mapping has address_space. |
| 1012 | * But page->mapping may have out-of-use anon_vma pointer, |
| 1013 | * detecit it by PageAnon() check. newly-mapped-anon's page->mapping |
| 1014 | * is NULL. |
| 1015 | */ |
| 1016 | if (page_mapped(page) || (page->mapping && !PageAnon(page))) |
| 1017 | return 0; |
| 1018 | if (unlikely(!mm)) |
| 1019 | mm = &init_mm; |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 1020 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1021 | MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL); |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 1022 | } |
| 1023 | |
Balbir Singh | e1a1cd5 | 2008-02-07 00:14:02 -0800 | [diff] [blame] | 1024 | int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, |
| 1025 | gfp_t gfp_mask) |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1026 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1027 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 1028 | return 0; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1029 | if (PageCompound(page)) |
| 1030 | return 0; |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 1031 | /* |
| 1032 | * Corner case handling. This is called from add_to_page_cache() |
| 1033 | * in usual. But some FS (shmem) precharges this page before calling it |
| 1034 | * and call add_to_page_cache() with GFP_NOWAIT. |
| 1035 | * |
| 1036 | * For GFP_NOWAIT case, the page may be pre-charged before calling |
| 1037 | * add_to_page_cache(). (See shmem.c) check it here and avoid to call |
| 1038 | * charge twice. (It works but has to pay a bit larger cost.) |
| 1039 | */ |
| 1040 | if (!(gfp_mask & __GFP_WAIT)) { |
| 1041 | struct page_cgroup *pc; |
| 1042 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1043 | |
| 1044 | pc = lookup_page_cgroup(page); |
| 1045 | if (!pc) |
| 1046 | return 0; |
| 1047 | lock_page_cgroup(pc); |
| 1048 | if (PageCgroupUsed(pc)) { |
| 1049 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 1050 | return 0; |
| 1051 | } |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1052 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 1053 | } |
| 1054 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1055 | if (unlikely(!mm)) |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1056 | mm = &init_mm; |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 1057 | |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 1058 | if (page_is_file_cache(page)) |
| 1059 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1060 | MEM_CGROUP_CHARGE_TYPE_CACHE, NULL); |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 1061 | else |
| 1062 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
| 1063 | MEM_CGROUP_CHARGE_TYPE_SHMEM, NULL); |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1064 | } |
| 1065 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1066 | int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
| 1067 | struct page *page, |
| 1068 | gfp_t mask, struct mem_cgroup **ptr) |
| 1069 | { |
| 1070 | struct mem_cgroup *mem; |
| 1071 | swp_entry_t ent; |
| 1072 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1073 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1074 | return 0; |
| 1075 | |
| 1076 | if (!do_swap_account) |
| 1077 | goto charge_cur_mm; |
| 1078 | |
| 1079 | /* |
| 1080 | * A racing thread's fault, or swapoff, may have already updated |
| 1081 | * the pte, and even removed page from swap cache: return success |
| 1082 | * to go on to do_swap_page()'s pte_same() test, which should fail. |
| 1083 | */ |
| 1084 | if (!PageSwapCache(page)) |
| 1085 | return 0; |
| 1086 | |
| 1087 | ent.val = page_private(page); |
| 1088 | |
| 1089 | mem = lookup_swap_cgroup(ent); |
| 1090 | if (!mem || mem->obsolete) |
| 1091 | goto charge_cur_mm; |
| 1092 | *ptr = mem; |
| 1093 | return __mem_cgroup_try_charge(NULL, mask, ptr, true); |
| 1094 | charge_cur_mm: |
| 1095 | if (unlikely(!mm)) |
| 1096 | mm = &init_mm; |
| 1097 | return __mem_cgroup_try_charge(mm, mask, ptr, true); |
| 1098 | } |
| 1099 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1100 | #ifdef CONFIG_SWAP |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1101 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1102 | int mem_cgroup_cache_charge_swapin(struct page *page, |
| 1103 | struct mm_struct *mm, gfp_t mask, bool locked) |
| 1104 | { |
| 1105 | int ret = 0; |
| 1106 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1107 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1108 | return 0; |
| 1109 | if (unlikely(!mm)) |
| 1110 | mm = &init_mm; |
| 1111 | if (!locked) |
| 1112 | lock_page(page); |
| 1113 | /* |
| 1114 | * If not locked, the page can be dropped from SwapCache until |
| 1115 | * we reach here. |
| 1116 | */ |
| 1117 | if (PageSwapCache(page)) { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1118 | struct mem_cgroup *mem = NULL; |
| 1119 | swp_entry_t ent; |
| 1120 | |
| 1121 | ent.val = page_private(page); |
| 1122 | if (do_swap_account) { |
| 1123 | mem = lookup_swap_cgroup(ent); |
| 1124 | if (mem && mem->obsolete) |
| 1125 | mem = NULL; |
| 1126 | if (mem) |
| 1127 | mm = NULL; |
| 1128 | } |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1129 | ret = mem_cgroup_charge_common(page, mm, mask, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1130 | MEM_CGROUP_CHARGE_TYPE_SHMEM, mem); |
| 1131 | |
| 1132 | if (!ret && do_swap_account) { |
| 1133 | /* avoid double counting */ |
| 1134 | mem = swap_cgroup_record(ent, NULL); |
| 1135 | if (mem) { |
| 1136 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
| 1137 | mem_cgroup_put(mem); |
| 1138 | } |
| 1139 | } |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1140 | } |
| 1141 | if (!locked) |
| 1142 | unlock_page(page); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1143 | /* add this page(page_cgroup) to the LRU we want. */ |
| 1144 | mem_cgroup_lru_fixup(page); |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1145 | |
| 1146 | return ret; |
| 1147 | } |
| 1148 | #endif |
| 1149 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1150 | void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr) |
| 1151 | { |
| 1152 | struct page_cgroup *pc; |
| 1153 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1154 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1155 | return; |
| 1156 | if (!ptr) |
| 1157 | return; |
| 1158 | pc = lookup_page_cgroup(page); |
| 1159 | __mem_cgroup_commit_charge(ptr, pc, MEM_CGROUP_CHARGE_TYPE_MAPPED); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1160 | /* |
| 1161 | * Now swap is on-memory. This means this page may be |
| 1162 | * counted both as mem and swap....double count. |
| 1163 | * Fix it by uncharging from memsw. This SwapCache is stable |
| 1164 | * because we're still under lock_page(). |
| 1165 | */ |
| 1166 | if (do_swap_account) { |
| 1167 | swp_entry_t ent = {.val = page_private(page)}; |
| 1168 | struct mem_cgroup *memcg; |
| 1169 | memcg = swap_cgroup_record(ent, NULL); |
| 1170 | if (memcg) { |
| 1171 | /* If memcg is obsolete, memcg can be != ptr */ |
| 1172 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
| 1173 | mem_cgroup_put(memcg); |
| 1174 | } |
| 1175 | |
| 1176 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1177 | /* add this page(page_cgroup) to the LRU we want. */ |
| 1178 | mem_cgroup_lru_fixup(page); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1179 | } |
| 1180 | |
| 1181 | void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem) |
| 1182 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1183 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1184 | return; |
| 1185 | if (!mem) |
| 1186 | return; |
| 1187 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1188 | if (do_swap_account) |
| 1189 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1190 | css_put(&mem->css); |
| 1191 | } |
| 1192 | |
| 1193 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1194 | /* |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1195 | * uncharge if !page_mapped(page) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1196 | */ |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1197 | static struct mem_cgroup * |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1198 | __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1199 | { |
Hugh Dickins | 8289546 | 2008-03-04 14:29:08 -0800 | [diff] [blame] | 1200 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1201 | struct mem_cgroup *mem = NULL; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 1202 | struct mem_cgroup_per_zone *mz; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1203 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1204 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1205 | return NULL; |
Balbir Singh | 4077960 | 2008-04-04 14:29:59 -0700 | [diff] [blame] | 1206 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1207 | if (PageSwapCache(page)) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1208 | return NULL; |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1209 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1210 | /* |
Balbir Singh | 3c541e1 | 2008-02-07 00:14:41 -0800 | [diff] [blame] | 1211 | * Check if our page_cgroup is valid |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1212 | */ |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1213 | pc = lookup_page_cgroup(page); |
| 1214 | if (unlikely(!pc || !PageCgroupUsed(pc))) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1215 | return NULL; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1216 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1217 | lock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1218 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1219 | mem = pc->mem_cgroup; |
| 1220 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1221 | if (!PageCgroupUsed(pc)) |
| 1222 | goto unlock_out; |
| 1223 | |
| 1224 | switch (ctype) { |
| 1225 | case MEM_CGROUP_CHARGE_TYPE_MAPPED: |
| 1226 | if (page_mapped(page)) |
| 1227 | goto unlock_out; |
| 1228 | break; |
| 1229 | case MEM_CGROUP_CHARGE_TYPE_SWAPOUT: |
| 1230 | if (!PageAnon(page)) { /* Shared memory */ |
| 1231 | if (page->mapping && !page_is_file_cache(page)) |
| 1232 | goto unlock_out; |
| 1233 | } else if (page_mapped(page)) /* Anon */ |
| 1234 | goto unlock_out; |
| 1235 | break; |
| 1236 | default: |
| 1237 | break; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1238 | } |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1239 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1240 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
| 1241 | if (do_swap_account && (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT)) |
| 1242 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
| 1243 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1244 | mem_cgroup_charge_statistics(mem, pc, false); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1245 | ClearPageCgroupUsed(pc); |
Hugh Dickins | b9c565d | 2008-03-04 14:29:11 -0800 | [diff] [blame] | 1246 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1247 | mz = page_cgroup_zoneinfo(pc); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1248 | unlock_page_cgroup(pc); |
Hugh Dickins | fb59e9f | 2008-03-04 14:29:16 -0800 | [diff] [blame] | 1249 | |
KAMEZAWA Hiroyuki | a7fe942 | 2009-01-07 18:08:13 -0800 | [diff] [blame] | 1250 | /* at swapout, this memcg will be accessed to record to swap */ |
| 1251 | if (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT) |
| 1252 | css_put(&mem->css); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1253 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1254 | return mem; |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1255 | |
| 1256 | unlock_out: |
| 1257 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1258 | return NULL; |
Balbir Singh | 3c541e1 | 2008-02-07 00:14:41 -0800 | [diff] [blame] | 1259 | } |
| 1260 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1261 | void mem_cgroup_uncharge_page(struct page *page) |
| 1262 | { |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1263 | /* early check. */ |
| 1264 | if (page_mapped(page)) |
| 1265 | return; |
| 1266 | if (page->mapping && !PageAnon(page)) |
| 1267 | return; |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1268 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED); |
| 1269 | } |
| 1270 | |
| 1271 | void mem_cgroup_uncharge_cache_page(struct page *page) |
| 1272 | { |
| 1273 | VM_BUG_ON(page_mapped(page)); |
KAMEZAWA Hiroyuki | b7abea9 | 2008-10-18 20:28:09 -0700 | [diff] [blame] | 1274 | VM_BUG_ON(page->mapping); |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1275 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE); |
| 1276 | } |
| 1277 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1278 | /* |
| 1279 | * called from __delete_from_swap_cache() and drop "page" account. |
| 1280 | * memcg information is recorded to swap_cgroup of "ent" |
| 1281 | */ |
| 1282 | void mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent) |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1283 | { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1284 | struct mem_cgroup *memcg; |
| 1285 | |
| 1286 | memcg = __mem_cgroup_uncharge_common(page, |
| 1287 | MEM_CGROUP_CHARGE_TYPE_SWAPOUT); |
| 1288 | /* record memcg information */ |
| 1289 | if (do_swap_account && memcg) { |
| 1290 | swap_cgroup_record(ent, memcg); |
| 1291 | mem_cgroup_get(memcg); |
| 1292 | } |
KAMEZAWA Hiroyuki | a7fe942 | 2009-01-07 18:08:13 -0800 | [diff] [blame] | 1293 | if (memcg) |
| 1294 | css_put(&memcg->css); |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1295 | } |
| 1296 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1297 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 1298 | /* |
| 1299 | * called from swap_entry_free(). remove record in swap_cgroup and |
| 1300 | * uncharge "memsw" account. |
| 1301 | */ |
| 1302 | void mem_cgroup_uncharge_swap(swp_entry_t ent) |
| 1303 | { |
| 1304 | struct mem_cgroup *memcg; |
| 1305 | |
| 1306 | if (!do_swap_account) |
| 1307 | return; |
| 1308 | |
| 1309 | memcg = swap_cgroup_record(ent, NULL); |
| 1310 | if (memcg) { |
| 1311 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
| 1312 | mem_cgroup_put(memcg); |
| 1313 | } |
| 1314 | } |
| 1315 | #endif |
| 1316 | |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 1317 | /* |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1318 | * Before starting migration, account PAGE_SIZE to mem_cgroup that the old |
| 1319 | * page belongs to. |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 1320 | */ |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1321 | int mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr) |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 1322 | { |
| 1323 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1324 | struct mem_cgroup *mem = NULL; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1325 | int ret = 0; |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 1326 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1327 | if (mem_cgroup_disabled()) |
Balbir Singh | 4077960 | 2008-04-04 14:29:59 -0700 | [diff] [blame] | 1328 | return 0; |
| 1329 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1330 | pc = lookup_page_cgroup(page); |
| 1331 | lock_page_cgroup(pc); |
| 1332 | if (PageCgroupUsed(pc)) { |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1333 | mem = pc->mem_cgroup; |
| 1334 | css_get(&mem->css); |
Hugh Dickins | b9c565d | 2008-03-04 14:29:11 -0800 | [diff] [blame] | 1335 | } |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1336 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1337 | |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1338 | if (mem) { |
KAMEZAWA Hiroyuki | 2c26fdd | 2009-01-07 18:08:10 -0800 | [diff] [blame] | 1339 | ret = mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem); |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1340 | css_put(&mem->css); |
| 1341 | } |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1342 | *ptr = mem; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1343 | return ret; |
| 1344 | } |
Hugh Dickins | fb59e9f | 2008-03-04 14:29:16 -0800 | [diff] [blame] | 1345 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1346 | /* remove redundant charge if migration failed*/ |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1347 | void mem_cgroup_end_migration(struct mem_cgroup *mem, |
| 1348 | struct page *oldpage, struct page *newpage) |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1349 | { |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1350 | struct page *target, *unused; |
| 1351 | struct page_cgroup *pc; |
| 1352 | enum charge_type ctype; |
| 1353 | |
| 1354 | if (!mem) |
| 1355 | return; |
| 1356 | |
| 1357 | /* at migration success, oldpage->mapping is NULL. */ |
| 1358 | if (oldpage->mapping) { |
| 1359 | target = oldpage; |
| 1360 | unused = NULL; |
| 1361 | } else { |
| 1362 | target = newpage; |
| 1363 | unused = oldpage; |
| 1364 | } |
| 1365 | |
| 1366 | if (PageAnon(target)) |
| 1367 | ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED; |
| 1368 | else if (page_is_file_cache(target)) |
| 1369 | ctype = MEM_CGROUP_CHARGE_TYPE_CACHE; |
| 1370 | else |
| 1371 | ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM; |
| 1372 | |
| 1373 | /* unused page is not on radix-tree now. */ |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1374 | if (unused) |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1375 | __mem_cgroup_uncharge_common(unused, ctype); |
| 1376 | |
| 1377 | pc = lookup_page_cgroup(target); |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1378 | /* |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1379 | * __mem_cgroup_commit_charge() check PCG_USED bit of page_cgroup. |
| 1380 | * So, double-counting is effectively avoided. |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1381 | */ |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1382 | __mem_cgroup_commit_charge(mem, pc, ctype); |
| 1383 | |
| 1384 | /* |
| 1385 | * Both of oldpage and newpage are still under lock_page(). |
| 1386 | * Then, we don't have to care about race in radix-tree. |
| 1387 | * But we have to be careful that this page is unmapped or not. |
| 1388 | * |
| 1389 | * There is a case for !page_mapped(). At the start of |
| 1390 | * migration, oldpage was mapped. But now, it's zapped. |
| 1391 | * But we know *target* page is not freed/reused under us. |
| 1392 | * mem_cgroup_uncharge_page() does all necessary checks. |
| 1393 | */ |
| 1394 | if (ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED) |
| 1395 | mem_cgroup_uncharge_page(target); |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 1396 | } |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 1397 | |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1398 | /* |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1399 | * A call to try to shrink memory usage under specified resource controller. |
| 1400 | * This is typically used for page reclaiming for shmem for reducing side |
| 1401 | * effect of page allocation from shmem, which is used by some mem_cgroup. |
| 1402 | */ |
| 1403 | int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask) |
| 1404 | { |
| 1405 | struct mem_cgroup *mem; |
| 1406 | int progress = 0; |
| 1407 | int retry = MEM_CGROUP_RECLAIM_RETRIES; |
| 1408 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1409 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 1410 | return 0; |
Hugh Dickins | 9623e07 | 2008-08-12 15:08:41 -0700 | [diff] [blame] | 1411 | if (!mm) |
| 1412 | return 0; |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 1413 | |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1414 | rcu_read_lock(); |
| 1415 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 1416 | if (unlikely(!mem)) { |
| 1417 | rcu_read_unlock(); |
| 1418 | return 0; |
| 1419 | } |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1420 | css_get(&mem->css); |
| 1421 | rcu_read_unlock(); |
| 1422 | |
| 1423 | do { |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 1424 | progress = try_to_free_mem_cgroup_pages(mem, gfp_mask, true, |
| 1425 | get_swappiness(mem)); |
Daisuke Nishimura | b85a96c | 2009-01-07 18:08:12 -0800 | [diff] [blame] | 1426 | progress += mem_cgroup_check_under_limit(mem); |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1427 | } while (!progress && --retry); |
| 1428 | |
| 1429 | css_put(&mem->css); |
| 1430 | if (!retry) |
| 1431 | return -ENOMEM; |
| 1432 | return 0; |
| 1433 | } |
| 1434 | |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 1435 | /* |
| 1436 | * The inactive anon list should be small enough that the VM never has to |
| 1437 | * do too much work, but large enough that each inactive page has a chance |
| 1438 | * to be referenced again before it is swapped out. |
| 1439 | * |
| 1440 | * this calculation is straightforward porting from |
| 1441 | * page_alloc.c::setup_per_zone_inactive_ratio(). |
| 1442 | * it describe more detail. |
| 1443 | */ |
| 1444 | static void mem_cgroup_set_inactive_ratio(struct mem_cgroup *memcg) |
| 1445 | { |
| 1446 | unsigned int gb, ratio; |
| 1447 | |
| 1448 | gb = res_counter_read_u64(&memcg->res, RES_LIMIT) >> 30; |
| 1449 | if (gb) |
| 1450 | ratio = int_sqrt(10 * gb); |
| 1451 | else |
| 1452 | ratio = 1; |
| 1453 | |
| 1454 | memcg->inactive_ratio = ratio; |
| 1455 | |
| 1456 | } |
| 1457 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1458 | static DEFINE_MUTEX(set_limit_mutex); |
| 1459 | |
KOSAKI Motohiro | d38d2a7 | 2009-01-06 14:39:44 -0800 | [diff] [blame] | 1460 | static int mem_cgroup_resize_limit(struct mem_cgroup *memcg, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1461 | unsigned long long val) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1462 | { |
| 1463 | |
| 1464 | int retry_count = MEM_CGROUP_RECLAIM_RETRIES; |
| 1465 | int progress; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1466 | u64 memswlimit; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1467 | int ret = 0; |
| 1468 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1469 | while (retry_count) { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1470 | if (signal_pending(current)) { |
| 1471 | ret = -EINTR; |
| 1472 | break; |
| 1473 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1474 | /* |
| 1475 | * Rather than hide all in some function, I do this in |
| 1476 | * open coded manner. You see what this really does. |
| 1477 | * We have to guarantee mem->res.limit < mem->memsw.limit. |
| 1478 | */ |
| 1479 | mutex_lock(&set_limit_mutex); |
| 1480 | memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 1481 | if (memswlimit < val) { |
| 1482 | ret = -EINVAL; |
| 1483 | mutex_unlock(&set_limit_mutex); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1484 | break; |
| 1485 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1486 | ret = res_counter_set_limit(&memcg->res, val); |
| 1487 | mutex_unlock(&set_limit_mutex); |
| 1488 | |
| 1489 | if (!ret) |
| 1490 | break; |
| 1491 | |
KAMEZAWA Hiroyuki | bced052 | 2009-01-07 18:07:49 -0800 | [diff] [blame] | 1492 | progress = try_to_free_mem_cgroup_pages(memcg, |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 1493 | GFP_KERNEL, |
| 1494 | false, |
| 1495 | get_swappiness(memcg)); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1496 | if (!progress) retry_count--; |
| 1497 | } |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 1498 | |
| 1499 | if (!ret) |
| 1500 | mem_cgroup_set_inactive_ratio(memcg); |
| 1501 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1502 | return ret; |
| 1503 | } |
| 1504 | |
| 1505 | int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg, |
| 1506 | unsigned long long val) |
| 1507 | { |
| 1508 | int retry_count = MEM_CGROUP_RECLAIM_RETRIES; |
| 1509 | u64 memlimit, oldusage, curusage; |
| 1510 | int ret; |
| 1511 | |
| 1512 | if (!do_swap_account) |
| 1513 | return -EINVAL; |
| 1514 | |
| 1515 | while (retry_count) { |
| 1516 | if (signal_pending(current)) { |
| 1517 | ret = -EINTR; |
| 1518 | break; |
| 1519 | } |
| 1520 | /* |
| 1521 | * Rather than hide all in some function, I do this in |
| 1522 | * open coded manner. You see what this really does. |
| 1523 | * We have to guarantee mem->res.limit < mem->memsw.limit. |
| 1524 | */ |
| 1525 | mutex_lock(&set_limit_mutex); |
| 1526 | memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 1527 | if (memlimit > val) { |
| 1528 | ret = -EINVAL; |
| 1529 | mutex_unlock(&set_limit_mutex); |
| 1530 | break; |
| 1531 | } |
| 1532 | ret = res_counter_set_limit(&memcg->memsw, val); |
| 1533 | mutex_unlock(&set_limit_mutex); |
| 1534 | |
| 1535 | if (!ret) |
| 1536 | break; |
| 1537 | |
| 1538 | oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 1539 | try_to_free_mem_cgroup_pages(memcg, GFP_KERNEL, true, |
| 1540 | get_swappiness(memcg)); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1541 | curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
| 1542 | if (curusage >= oldusage) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1543 | retry_count--; |
| 1544 | } |
| 1545 | return ret; |
| 1546 | } |
| 1547 | |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1548 | /* |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1549 | * This routine traverse page_cgroup in given list and drop them all. |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1550 | * *And* this routine doesn't reclaim page itself, just removes page_cgroup. |
| 1551 | */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1552 | static int mem_cgroup_force_empty_list(struct mem_cgroup *mem, |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1553 | int node, int zid, enum lru_list lru) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1554 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1555 | struct zone *zone; |
| 1556 | struct mem_cgroup_per_zone *mz; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1557 | struct page_cgroup *pc, *busy; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1558 | unsigned long flags, loop; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 1559 | struct list_head *list; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1560 | int ret = 0; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 1561 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1562 | zone = &NODE_DATA(node)->node_zones[zid]; |
| 1563 | mz = mem_cgroup_zoneinfo(mem, node, zid); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 1564 | list = &mz->lists[lru]; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1565 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1566 | loop = MEM_CGROUP_ZSTAT(mz, lru); |
| 1567 | /* give some margin against EBUSY etc...*/ |
| 1568 | loop += 256; |
| 1569 | busy = NULL; |
| 1570 | while (loop--) { |
| 1571 | ret = 0; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1572 | spin_lock_irqsave(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1573 | if (list_empty(list)) { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1574 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1575 | break; |
| 1576 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1577 | pc = list_entry(list->prev, struct page_cgroup, lru); |
| 1578 | if (busy == pc) { |
| 1579 | list_move(&pc->lru, list); |
| 1580 | busy = 0; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1581 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1582 | continue; |
| 1583 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1584 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1585 | |
KAMEZAWA Hiroyuki | 2c26fdd | 2009-01-07 18:08:10 -0800 | [diff] [blame] | 1586 | ret = mem_cgroup_move_parent(pc, mem, GFP_KERNEL); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1587 | if (ret == -ENOMEM) |
| 1588 | break; |
| 1589 | |
| 1590 | if (ret == -EBUSY || ret == -EINVAL) { |
| 1591 | /* found lock contention or "pc" is obsolete. */ |
| 1592 | busy = pc; |
| 1593 | cond_resched(); |
| 1594 | } else |
| 1595 | busy = NULL; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1596 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1597 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1598 | if (!ret && !list_empty(list)) |
| 1599 | return -EBUSY; |
| 1600 | return ret; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1601 | } |
| 1602 | |
| 1603 | /* |
| 1604 | * make mem_cgroup's charge to be 0 if there is no task. |
| 1605 | * This enables deleting this mem_cgroup. |
| 1606 | */ |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1607 | static int mem_cgroup_force_empty(struct mem_cgroup *mem, bool free_all) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1608 | { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1609 | int ret; |
| 1610 | int node, zid, shrink; |
| 1611 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1612 | struct cgroup *cgrp = mem->css.cgroup; |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 1613 | |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1614 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1615 | |
| 1616 | shrink = 0; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1617 | /* should free all ? */ |
| 1618 | if (free_all) |
| 1619 | goto try_to_free; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1620 | move_account: |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1621 | while (mem->res.usage > 0) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1622 | ret = -EBUSY; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1623 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children)) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1624 | goto out; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1625 | ret = -EINTR; |
| 1626 | if (signal_pending(current)) |
| 1627 | goto out; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1628 | /* This is for making all *used* pages to be on LRU. */ |
| 1629 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1630 | ret = 0; |
| 1631 | for_each_node_state(node, N_POSSIBLE) { |
| 1632 | for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) { |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 1633 | enum lru_list l; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1634 | for_each_lru(l) { |
| 1635 | ret = mem_cgroup_force_empty_list(mem, |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1636 | node, zid, l); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1637 | if (ret) |
| 1638 | break; |
| 1639 | } |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1640 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1641 | if (ret) |
| 1642 | break; |
| 1643 | } |
| 1644 | /* it seems parent cgroup doesn't have enough mem */ |
| 1645 | if (ret == -ENOMEM) |
| 1646 | goto try_to_free; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1647 | cond_resched(); |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1648 | } |
| 1649 | ret = 0; |
| 1650 | out: |
| 1651 | css_put(&mem->css); |
| 1652 | return ret; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1653 | |
| 1654 | try_to_free: |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1655 | /* returns EBUSY if there is a task or if we come here twice. */ |
| 1656 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children) || shrink) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1657 | ret = -EBUSY; |
| 1658 | goto out; |
| 1659 | } |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1660 | /* we call try-to-free pages for make this cgroup empty */ |
| 1661 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1662 | /* try to free all pages in this cgroup */ |
| 1663 | shrink = 1; |
| 1664 | while (nr_retries && mem->res.usage > 0) { |
| 1665 | int progress; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1666 | |
| 1667 | if (signal_pending(current)) { |
| 1668 | ret = -EINTR; |
| 1669 | goto out; |
| 1670 | } |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 1671 | progress = try_to_free_mem_cgroup_pages(mem, GFP_KERNEL, |
| 1672 | false, get_swappiness(mem)); |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1673 | if (!progress) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1674 | nr_retries--; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1675 | /* maybe some writeback is necessary */ |
| 1676 | congestion_wait(WRITE, HZ/10); |
| 1677 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1678 | |
| 1679 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1680 | lru_add_drain(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1681 | /* try move_account...there may be some *locked* pages. */ |
| 1682 | if (mem->res.usage) |
| 1683 | goto move_account; |
| 1684 | ret = 0; |
| 1685 | goto out; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1686 | } |
| 1687 | |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1688 | int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event) |
| 1689 | { |
| 1690 | return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true); |
| 1691 | } |
| 1692 | |
| 1693 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 1694 | static u64 mem_cgroup_hierarchy_read(struct cgroup *cont, struct cftype *cft) |
| 1695 | { |
| 1696 | return mem_cgroup_from_cont(cont)->use_hierarchy; |
| 1697 | } |
| 1698 | |
| 1699 | static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft, |
| 1700 | u64 val) |
| 1701 | { |
| 1702 | int retval = 0; |
| 1703 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
| 1704 | struct cgroup *parent = cont->parent; |
| 1705 | struct mem_cgroup *parent_mem = NULL; |
| 1706 | |
| 1707 | if (parent) |
| 1708 | parent_mem = mem_cgroup_from_cont(parent); |
| 1709 | |
| 1710 | cgroup_lock(); |
| 1711 | /* |
| 1712 | * If parent's use_hiearchy is set, we can't make any modifications |
| 1713 | * in the child subtrees. If it is unset, then the change can |
| 1714 | * occur, provided the current cgroup has no children. |
| 1715 | * |
| 1716 | * For the root cgroup, parent_mem is NULL, we allow value to be |
| 1717 | * set if there are no children. |
| 1718 | */ |
| 1719 | if ((!parent_mem || !parent_mem->use_hierarchy) && |
| 1720 | (val == 1 || val == 0)) { |
| 1721 | if (list_empty(&cont->children)) |
| 1722 | mem->use_hierarchy = val; |
| 1723 | else |
| 1724 | retval = -EBUSY; |
| 1725 | } else |
| 1726 | retval = -EINVAL; |
| 1727 | cgroup_unlock(); |
| 1728 | |
| 1729 | return retval; |
| 1730 | } |
| 1731 | |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 1732 | static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1733 | { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1734 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
| 1735 | u64 val = 0; |
| 1736 | int type, name; |
| 1737 | |
| 1738 | type = MEMFILE_TYPE(cft->private); |
| 1739 | name = MEMFILE_ATTR(cft->private); |
| 1740 | switch (type) { |
| 1741 | case _MEM: |
| 1742 | val = res_counter_read_u64(&mem->res, name); |
| 1743 | break; |
| 1744 | case _MEMSWAP: |
| 1745 | if (do_swap_account) |
| 1746 | val = res_counter_read_u64(&mem->memsw, name); |
| 1747 | break; |
| 1748 | default: |
| 1749 | BUG(); |
| 1750 | break; |
| 1751 | } |
| 1752 | return val; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1753 | } |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1754 | /* |
| 1755 | * The user of this function is... |
| 1756 | * RES_LIMIT. |
| 1757 | */ |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 1758 | static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft, |
| 1759 | const char *buffer) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1760 | { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1761 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1762 | int type, name; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1763 | unsigned long long val; |
| 1764 | int ret; |
| 1765 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1766 | type = MEMFILE_TYPE(cft->private); |
| 1767 | name = MEMFILE_ATTR(cft->private); |
| 1768 | switch (name) { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1769 | case RES_LIMIT: |
| 1770 | /* This function does all necessary parse...reuse it */ |
| 1771 | ret = res_counter_memparse_write_strategy(buffer, &val); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1772 | if (ret) |
| 1773 | break; |
| 1774 | if (type == _MEM) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1775 | ret = mem_cgroup_resize_limit(memcg, val); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1776 | else |
| 1777 | ret = mem_cgroup_resize_memsw_limit(memcg, val); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1778 | break; |
| 1779 | default: |
| 1780 | ret = -EINVAL; /* should be BUG() ? */ |
| 1781 | break; |
| 1782 | } |
| 1783 | return ret; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1784 | } |
| 1785 | |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1786 | static int mem_cgroup_reset(struct cgroup *cont, unsigned int event) |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1787 | { |
| 1788 | struct mem_cgroup *mem; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1789 | int type, name; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1790 | |
| 1791 | mem = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1792 | type = MEMFILE_TYPE(event); |
| 1793 | name = MEMFILE_ATTR(event); |
| 1794 | switch (name) { |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1795 | case RES_MAX_USAGE: |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1796 | if (type == _MEM) |
| 1797 | res_counter_reset_max(&mem->res); |
| 1798 | else |
| 1799 | res_counter_reset_max(&mem->memsw); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1800 | break; |
| 1801 | case RES_FAILCNT: |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1802 | if (type == _MEM) |
| 1803 | res_counter_reset_failcnt(&mem->res); |
| 1804 | else |
| 1805 | res_counter_reset_failcnt(&mem->memsw); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1806 | break; |
| 1807 | } |
Pavel Emelyanov | 85cc59d | 2008-04-29 01:00:20 -0700 | [diff] [blame] | 1808 | return 0; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1809 | } |
| 1810 | |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1811 | static const struct mem_cgroup_stat_desc { |
| 1812 | const char *msg; |
| 1813 | u64 unit; |
| 1814 | } mem_cgroup_stat_desc[] = { |
| 1815 | [MEM_CGROUP_STAT_CACHE] = { "cache", PAGE_SIZE, }, |
| 1816 | [MEM_CGROUP_STAT_RSS] = { "rss", PAGE_SIZE, }, |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 1817 | [MEM_CGROUP_STAT_PGPGIN_COUNT] = {"pgpgin", 1, }, |
| 1818 | [MEM_CGROUP_STAT_PGPGOUT_COUNT] = {"pgpgout", 1, }, |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1819 | }; |
| 1820 | |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 1821 | static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft, |
| 1822 | struct cgroup_map_cb *cb) |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1823 | { |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1824 | struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont); |
| 1825 | struct mem_cgroup_stat *stat = &mem_cont->stat; |
| 1826 | int i; |
| 1827 | |
| 1828 | for (i = 0; i < ARRAY_SIZE(stat->cpustat[0].count); i++) { |
| 1829 | s64 val; |
| 1830 | |
| 1831 | val = mem_cgroup_read_stat(stat, i); |
| 1832 | val *= mem_cgroup_stat_desc[i].unit; |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 1833 | cb->fill(cb, mem_cgroup_stat_desc[i].msg, val); |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1834 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1835 | /* showing # of active pages */ |
| 1836 | { |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1837 | unsigned long active_anon, inactive_anon; |
| 1838 | unsigned long active_file, inactive_file; |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 1839 | unsigned long unevictable; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1840 | |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1841 | inactive_anon = mem_cgroup_get_all_zonestat(mem_cont, |
| 1842 | LRU_INACTIVE_ANON); |
| 1843 | active_anon = mem_cgroup_get_all_zonestat(mem_cont, |
| 1844 | LRU_ACTIVE_ANON); |
| 1845 | inactive_file = mem_cgroup_get_all_zonestat(mem_cont, |
| 1846 | LRU_INACTIVE_FILE); |
| 1847 | active_file = mem_cgroup_get_all_zonestat(mem_cont, |
| 1848 | LRU_ACTIVE_FILE); |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 1849 | unevictable = mem_cgroup_get_all_zonestat(mem_cont, |
| 1850 | LRU_UNEVICTABLE); |
| 1851 | |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1852 | cb->fill(cb, "active_anon", (active_anon) * PAGE_SIZE); |
| 1853 | cb->fill(cb, "inactive_anon", (inactive_anon) * PAGE_SIZE); |
| 1854 | cb->fill(cb, "active_file", (active_file) * PAGE_SIZE); |
| 1855 | cb->fill(cb, "inactive_file", (inactive_file) * PAGE_SIZE); |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 1856 | cb->fill(cb, "unevictable", unevictable * PAGE_SIZE); |
| 1857 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1858 | } |
KOSAKI Motohiro | 7f016ee | 2009-01-07 18:08:22 -0800 | [diff] [blame] | 1859 | |
| 1860 | #ifdef CONFIG_DEBUG_VM |
| 1861 | cb->fill(cb, "inactive_ratio", mem_cont->inactive_ratio); |
| 1862 | |
| 1863 | { |
| 1864 | int nid, zid; |
| 1865 | struct mem_cgroup_per_zone *mz; |
| 1866 | unsigned long recent_rotated[2] = {0, 0}; |
| 1867 | unsigned long recent_scanned[2] = {0, 0}; |
| 1868 | |
| 1869 | for_each_online_node(nid) |
| 1870 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { |
| 1871 | mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
| 1872 | |
| 1873 | recent_rotated[0] += |
| 1874 | mz->reclaim_stat.recent_rotated[0]; |
| 1875 | recent_rotated[1] += |
| 1876 | mz->reclaim_stat.recent_rotated[1]; |
| 1877 | recent_scanned[0] += |
| 1878 | mz->reclaim_stat.recent_scanned[0]; |
| 1879 | recent_scanned[1] += |
| 1880 | mz->reclaim_stat.recent_scanned[1]; |
| 1881 | } |
| 1882 | cb->fill(cb, "recent_rotated_anon", recent_rotated[0]); |
| 1883 | cb->fill(cb, "recent_rotated_file", recent_rotated[1]); |
| 1884 | cb->fill(cb, "recent_scanned_anon", recent_scanned[0]); |
| 1885 | cb->fill(cb, "recent_scanned_file", recent_scanned[1]); |
| 1886 | } |
| 1887 | #endif |
| 1888 | |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1889 | return 0; |
| 1890 | } |
| 1891 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 1892 | static u64 mem_cgroup_swappiness_read(struct cgroup *cgrp, struct cftype *cft) |
| 1893 | { |
| 1894 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
| 1895 | |
| 1896 | return get_swappiness(memcg); |
| 1897 | } |
| 1898 | |
| 1899 | static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft, |
| 1900 | u64 val) |
| 1901 | { |
| 1902 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); |
| 1903 | struct mem_cgroup *parent; |
| 1904 | if (val > 100) |
| 1905 | return -EINVAL; |
| 1906 | |
| 1907 | if (cgrp->parent == NULL) |
| 1908 | return -EINVAL; |
| 1909 | |
| 1910 | parent = mem_cgroup_from_cont(cgrp->parent); |
| 1911 | /* If under hierarchy, only empty-root can set this value */ |
| 1912 | if ((parent->use_hierarchy) || |
| 1913 | (memcg->use_hierarchy && !list_empty(&cgrp->children))) |
| 1914 | return -EINVAL; |
| 1915 | |
| 1916 | spin_lock(&memcg->reclaim_param_lock); |
| 1917 | memcg->swappiness = val; |
| 1918 | spin_unlock(&memcg->reclaim_param_lock); |
| 1919 | |
| 1920 | return 0; |
| 1921 | } |
| 1922 | |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1923 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1924 | static struct cftype mem_cgroup_files[] = { |
| 1925 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 1926 | .name = "usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1927 | .private = MEMFILE_PRIVATE(_MEM, RES_USAGE), |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 1928 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1929 | }, |
| 1930 | { |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1931 | .name = "max_usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1932 | .private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE), |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1933 | .trigger = mem_cgroup_reset, |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1934 | .read_u64 = mem_cgroup_read, |
| 1935 | }, |
| 1936 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 1937 | .name = "limit_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1938 | .private = MEMFILE_PRIVATE(_MEM, RES_LIMIT), |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 1939 | .write_string = mem_cgroup_write, |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 1940 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1941 | }, |
| 1942 | { |
| 1943 | .name = "failcnt", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1944 | .private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT), |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1945 | .trigger = mem_cgroup_reset, |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 1946 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1947 | }, |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1948 | { |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1949 | .name = "stat", |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 1950 | .read_map = mem_control_stat_show, |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1951 | }, |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1952 | { |
| 1953 | .name = "force_empty", |
| 1954 | .trigger = mem_cgroup_force_empty_write, |
| 1955 | }, |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 1956 | { |
| 1957 | .name = "use_hierarchy", |
| 1958 | .write_u64 = mem_cgroup_hierarchy_write, |
| 1959 | .read_u64 = mem_cgroup_hierarchy_read, |
| 1960 | }, |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 1961 | { |
| 1962 | .name = "swappiness", |
| 1963 | .read_u64 = mem_cgroup_swappiness_read, |
| 1964 | .write_u64 = mem_cgroup_swappiness_write, |
| 1965 | }, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1966 | }; |
| 1967 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1968 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 1969 | static struct cftype memsw_cgroup_files[] = { |
| 1970 | { |
| 1971 | .name = "memsw.usage_in_bytes", |
| 1972 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE), |
| 1973 | .read_u64 = mem_cgroup_read, |
| 1974 | }, |
| 1975 | { |
| 1976 | .name = "memsw.max_usage_in_bytes", |
| 1977 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE), |
| 1978 | .trigger = mem_cgroup_reset, |
| 1979 | .read_u64 = mem_cgroup_read, |
| 1980 | }, |
| 1981 | { |
| 1982 | .name = "memsw.limit_in_bytes", |
| 1983 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT), |
| 1984 | .write_string = mem_cgroup_write, |
| 1985 | .read_u64 = mem_cgroup_read, |
| 1986 | }, |
| 1987 | { |
| 1988 | .name = "memsw.failcnt", |
| 1989 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT), |
| 1990 | .trigger = mem_cgroup_reset, |
| 1991 | .read_u64 = mem_cgroup_read, |
| 1992 | }, |
| 1993 | }; |
| 1994 | |
| 1995 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) |
| 1996 | { |
| 1997 | if (!do_swap_account) |
| 1998 | return 0; |
| 1999 | return cgroup_add_files(cont, ss, memsw_cgroup_files, |
| 2000 | ARRAY_SIZE(memsw_cgroup_files)); |
| 2001 | }; |
| 2002 | #else |
| 2003 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) |
| 2004 | { |
| 2005 | return 0; |
| 2006 | } |
| 2007 | #endif |
| 2008 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2009 | static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
| 2010 | { |
| 2011 | struct mem_cgroup_per_node *pn; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 2012 | struct mem_cgroup_per_zone *mz; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 2013 | enum lru_list l; |
KAMEZAWA Hiroyuki | 41e3355 | 2008-04-08 17:41:54 -0700 | [diff] [blame] | 2014 | int zone, tmp = node; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 2015 | /* |
| 2016 | * This routine is called against possible nodes. |
| 2017 | * But it's BUG to call kmalloc() against offline node. |
| 2018 | * |
| 2019 | * TODO: this routine can waste much memory for nodes which will |
| 2020 | * never be onlined. It's better to use memory hotplug callback |
| 2021 | * function. |
| 2022 | */ |
KAMEZAWA Hiroyuki | 41e3355 | 2008-04-08 17:41:54 -0700 | [diff] [blame] | 2023 | if (!node_state(node, N_NORMAL_MEMORY)) |
| 2024 | tmp = -1; |
| 2025 | pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, tmp); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2026 | if (!pn) |
| 2027 | return 1; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 2028 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2029 | mem->info.nodeinfo[node] = pn; |
| 2030 | memset(pn, 0, sizeof(*pn)); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 2031 | |
| 2032 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { |
| 2033 | mz = &pn->zoneinfo[zone]; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 2034 | for_each_lru(l) |
| 2035 | INIT_LIST_HEAD(&mz->lists[l]); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 2036 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2037 | return 0; |
| 2038 | } |
| 2039 | |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 2040 | static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
| 2041 | { |
| 2042 | kfree(mem->info.nodeinfo[node]); |
| 2043 | } |
| 2044 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2045 | static int mem_cgroup_size(void) |
| 2046 | { |
| 2047 | int cpustat_size = nr_cpu_ids * sizeof(struct mem_cgroup_stat_cpu); |
| 2048 | return sizeof(struct mem_cgroup) + cpustat_size; |
| 2049 | } |
| 2050 | |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 2051 | static struct mem_cgroup *mem_cgroup_alloc(void) |
| 2052 | { |
| 2053 | struct mem_cgroup *mem; |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2054 | int size = mem_cgroup_size(); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 2055 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2056 | if (size < PAGE_SIZE) |
| 2057 | mem = kmalloc(size, GFP_KERNEL); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 2058 | else |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2059 | mem = vmalloc(size); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 2060 | |
| 2061 | if (mem) |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2062 | memset(mem, 0, size); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 2063 | return mem; |
| 2064 | } |
| 2065 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2066 | /* |
| 2067 | * At destroying mem_cgroup, references from swap_cgroup can remain. |
| 2068 | * (scanning all at force_empty is too costly...) |
| 2069 | * |
| 2070 | * Instead of clearing all references at force_empty, we remember |
| 2071 | * the number of reference from swap_cgroup and free mem_cgroup when |
| 2072 | * it goes down to 0. |
| 2073 | * |
| 2074 | * When mem_cgroup is destroyed, mem->obsolete will be set to 0 and |
| 2075 | * entry which points to this memcg will be ignore at swapin. |
| 2076 | * |
| 2077 | * Removal of cgroup itself succeeds regardless of refs from swap. |
| 2078 | */ |
| 2079 | |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 2080 | static void mem_cgroup_free(struct mem_cgroup *mem) |
| 2081 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2082 | int node; |
| 2083 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2084 | if (atomic_read(&mem->refcnt) > 0) |
| 2085 | return; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 2086 | |
| 2087 | |
| 2088 | for_each_node_state(node, N_POSSIBLE) |
| 2089 | free_mem_cgroup_per_zone_info(mem, node); |
| 2090 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2091 | if (mem_cgroup_size() < PAGE_SIZE) |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 2092 | kfree(mem); |
| 2093 | else |
| 2094 | vfree(mem); |
| 2095 | } |
| 2096 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2097 | static void mem_cgroup_get(struct mem_cgroup *mem) |
| 2098 | { |
| 2099 | atomic_inc(&mem->refcnt); |
| 2100 | } |
| 2101 | |
| 2102 | static void mem_cgroup_put(struct mem_cgroup *mem) |
| 2103 | { |
| 2104 | if (atomic_dec_and_test(&mem->refcnt)) { |
| 2105 | if (!mem->obsolete) |
| 2106 | return; |
| 2107 | mem_cgroup_free(mem); |
| 2108 | } |
| 2109 | } |
| 2110 | |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 2111 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 2112 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 2113 | static void __init enable_swap_cgroup(void) |
| 2114 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 2115 | if (!mem_cgroup_disabled() && really_do_swap_account) |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 2116 | do_swap_account = 1; |
| 2117 | } |
| 2118 | #else |
| 2119 | static void __init enable_swap_cgroup(void) |
| 2120 | { |
| 2121 | } |
| 2122 | #endif |
| 2123 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2124 | static struct cgroup_subsys_state * |
| 2125 | mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) |
| 2126 | { |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 2127 | struct mem_cgroup *mem, *parent; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2128 | int node; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2129 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2130 | mem = mem_cgroup_alloc(); |
| 2131 | if (!mem) |
| 2132 | return ERR_PTR(-ENOMEM); |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 2133 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2134 | for_each_node_state(node, N_POSSIBLE) |
| 2135 | if (alloc_mem_cgroup_per_zone_info(mem, node)) |
| 2136 | goto free_out; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 2137 | /* root ? */ |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 2138 | if (cont->parent == NULL) { |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 2139 | enable_swap_cgroup(); |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 2140 | parent = NULL; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2141 | } else { |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 2142 | parent = mem_cgroup_from_cont(cont->parent); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2143 | mem->use_hierarchy = parent->use_hierarchy; |
| 2144 | } |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 2145 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame] | 2146 | if (parent && parent->use_hierarchy) { |
| 2147 | res_counter_init(&mem->res, &parent->res); |
| 2148 | res_counter_init(&mem->memsw, &parent->memsw); |
| 2149 | } else { |
| 2150 | res_counter_init(&mem->res, NULL); |
| 2151 | res_counter_init(&mem->memsw, NULL); |
| 2152 | } |
KOSAKI Motohiro | 14797e2 | 2009-01-07 18:08:18 -0800 | [diff] [blame] | 2153 | mem_cgroup_set_inactive_ratio(mem); |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 2154 | mem->last_scanned_child = NULL; |
KOSAKI Motohiro | 2733c06 | 2009-01-07 18:08:23 -0800 | [diff] [blame] | 2155 | spin_lock_init(&mem->reclaim_param_lock); |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 2156 | |
KOSAKI Motohiro | a7885eb | 2009-01-07 18:08:24 -0800 | [diff] [blame^] | 2157 | if (parent) |
| 2158 | mem->swappiness = get_swappiness(parent); |
| 2159 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2160 | return &mem->css; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2161 | free_out: |
| 2162 | for_each_node_state(node, N_POSSIBLE) |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 2163 | free_mem_cgroup_per_zone_info(mem, node); |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 2164 | mem_cgroup_free(mem); |
Li Zefan | 2dda81c | 2008-02-23 15:24:14 -0800 | [diff] [blame] | 2165 | return ERR_PTR(-ENOMEM); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2166 | } |
| 2167 | |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 2168 | static void mem_cgroup_pre_destroy(struct cgroup_subsys *ss, |
| 2169 | struct cgroup *cont) |
| 2170 | { |
| 2171 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2172 | mem->obsolete = 1; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 2173 | mem_cgroup_force_empty(mem, false); |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 2174 | } |
| 2175 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2176 | static void mem_cgroup_destroy(struct cgroup_subsys *ss, |
| 2177 | struct cgroup *cont) |
| 2178 | { |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 2179 | mem_cgroup_free(mem_cgroup_from_cont(cont)); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2180 | } |
| 2181 | |
| 2182 | static int mem_cgroup_populate(struct cgroup_subsys *ss, |
| 2183 | struct cgroup *cont) |
| 2184 | { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 2185 | int ret; |
| 2186 | |
| 2187 | ret = cgroup_add_files(cont, ss, mem_cgroup_files, |
| 2188 | ARRAY_SIZE(mem_cgroup_files)); |
| 2189 | |
| 2190 | if (!ret) |
| 2191 | ret = register_memsw_files(cont, ss); |
| 2192 | return ret; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2193 | } |
| 2194 | |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 2195 | static void mem_cgroup_move_task(struct cgroup_subsys *ss, |
| 2196 | struct cgroup *cont, |
| 2197 | struct cgroup *old_cont, |
| 2198 | struct task_struct *p) |
| 2199 | { |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 2200 | /* |
Nikanth Karthikesan | f9717d2 | 2009-01-07 18:08:11 -0800 | [diff] [blame] | 2201 | * FIXME: It's better to move charges of this process from old |
| 2202 | * memcg to new memcg. But it's just on TODO-List now. |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 2203 | */ |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 2204 | } |
| 2205 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2206 | struct cgroup_subsys mem_cgroup_subsys = { |
| 2207 | .name = "memory", |
| 2208 | .subsys_id = mem_cgroup_subsys_id, |
| 2209 | .create = mem_cgroup_create, |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 2210 | .pre_destroy = mem_cgroup_pre_destroy, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2211 | .destroy = mem_cgroup_destroy, |
| 2212 | .populate = mem_cgroup_populate, |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 2213 | .attach = mem_cgroup_move_task, |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2214 | .early_init = 0, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2215 | }; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 2216 | |
| 2217 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 2218 | |
| 2219 | static int __init disable_swap_account(char *s) |
| 2220 | { |
| 2221 | really_do_swap_account = 0; |
| 2222 | return 1; |
| 2223 | } |
| 2224 | __setup("noswapaccount", disable_swap_account); |
| 2225 | #endif |