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]; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 106 | }; |
| 107 | /* Macro for accessing counter */ |
| 108 | #define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)]) |
| 109 | |
| 110 | struct mem_cgroup_per_node { |
| 111 | struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES]; |
| 112 | }; |
| 113 | |
| 114 | struct mem_cgroup_lru_info { |
| 115 | struct mem_cgroup_per_node *nodeinfo[MAX_NUMNODES]; |
| 116 | }; |
| 117 | |
| 118 | /* |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 119 | * The memory controller data structure. The memory controller controls both |
| 120 | * page cache and RSS per cgroup. We would eventually like to provide |
| 121 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, |
| 122 | * to help the administrator determine what knobs to tune. |
| 123 | * |
| 124 | * 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] | 125 | * we hit the water mark. May be even add a low water mark, such that |
| 126 | * no reclaim occurs from a cgroup at it's low water mark, this is |
| 127 | * a feature that will be implemented much later in the future. |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 128 | */ |
| 129 | struct mem_cgroup { |
| 130 | struct cgroup_subsys_state css; |
| 131 | /* |
| 132 | * the counter to account for memory usage |
| 133 | */ |
| 134 | struct res_counter res; |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 135 | /* |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 136 | * the counter to account for mem+swap usage. |
| 137 | */ |
| 138 | struct res_counter memsw; |
| 139 | /* |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 140 | * Per cgroup active and inactive list, similar to the |
| 141 | * per zone LRU lists. |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 142 | */ |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 143 | struct mem_cgroup_lru_info info; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 144 | |
KAMEZAWA Hiroyuki | 6c48a1d | 2008-02-07 00:14:34 -0800 | [diff] [blame] | 145 | int prev_priority; /* for recording reclaim priority */ |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 146 | |
| 147 | /* |
| 148 | * While reclaiming in a hiearchy, we cache the last child we |
| 149 | * reclaimed from. Protected by cgroup_lock() |
| 150 | */ |
| 151 | struct mem_cgroup *last_scanned_child; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame^] | 152 | /* |
| 153 | * Should the accounting and control be hierarchical, per subtree? |
| 154 | */ |
| 155 | bool use_hierarchy; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 156 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 157 | int obsolete; |
| 158 | atomic_t refcnt; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 159 | /* |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 160 | * statistics. This must be placed at the end of memcg. |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 161 | */ |
| 162 | struct mem_cgroup_stat stat; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 163 | }; |
| 164 | |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 165 | enum charge_type { |
| 166 | MEM_CGROUP_CHARGE_TYPE_CACHE = 0, |
| 167 | MEM_CGROUP_CHARGE_TYPE_MAPPED, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 168 | MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */ |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 169 | MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */ |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 170 | MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */ |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 171 | NR_CHARGE_TYPE, |
| 172 | }; |
| 173 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 174 | /* only for here (for easy reading.) */ |
| 175 | #define PCGF_CACHE (1UL << PCG_CACHE) |
| 176 | #define PCGF_USED (1UL << PCG_USED) |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 177 | #define PCGF_LOCK (1UL << PCG_LOCK) |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 178 | static const unsigned long |
| 179 | pcg_default_flags[NR_CHARGE_TYPE] = { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 180 | PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* File Cache */ |
| 181 | PCGF_USED | PCGF_LOCK, /* Anon */ |
| 182 | PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* Shmem */ |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 183 | 0, /* FORCE */ |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 184 | }; |
| 185 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 186 | |
| 187 | /* for encoding cft->private value on file */ |
| 188 | #define _MEM (0) |
| 189 | #define _MEMSWAP (1) |
| 190 | #define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val)) |
| 191 | #define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff) |
| 192 | #define MEMFILE_ATTR(val) ((val) & 0xffff) |
| 193 | |
| 194 | static void mem_cgroup_get(struct mem_cgroup *mem); |
| 195 | static void mem_cgroup_put(struct mem_cgroup *mem); |
| 196 | |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 197 | static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, |
| 198 | struct page_cgroup *pc, |
| 199 | bool charge) |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 200 | { |
| 201 | int val = (charge)? 1 : -1; |
| 202 | struct mem_cgroup_stat *stat = &mem->stat; |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 203 | struct mem_cgroup_stat_cpu *cpustat; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 204 | int cpu = get_cpu(); |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 205 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 206 | cpustat = &stat->cpustat[cpu]; |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 207 | if (PageCgroupCache(pc)) |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 208 | __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_CACHE, val); |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 209 | else |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 210 | __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_RSS, val); |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 211 | |
| 212 | if (charge) |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 213 | __mem_cgroup_stat_add_safe(cpustat, |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 214 | MEM_CGROUP_STAT_PGPGIN_COUNT, 1); |
| 215 | else |
KAMEZAWA Hiroyuki | addb9ef | 2008-10-18 20:28:10 -0700 | [diff] [blame] | 216 | __mem_cgroup_stat_add_safe(cpustat, |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 217 | MEM_CGROUP_STAT_PGPGOUT_COUNT, 1); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 218 | put_cpu(); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 219 | } |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 220 | |
Hugh Dickins | d5b69e3 | 2008-03-04 14:29:10 -0800 | [diff] [blame] | 221 | static struct mem_cgroup_per_zone * |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 222 | mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid) |
| 223 | { |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 224 | return &mem->info.nodeinfo[nid]->zoneinfo[zid]; |
| 225 | } |
| 226 | |
Hugh Dickins | d5b69e3 | 2008-03-04 14:29:10 -0800 | [diff] [blame] | 227 | static struct mem_cgroup_per_zone * |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 228 | page_cgroup_zoneinfo(struct page_cgroup *pc) |
| 229 | { |
| 230 | struct mem_cgroup *mem = pc->mem_cgroup; |
| 231 | int nid = page_cgroup_nid(pc); |
| 232 | int zid = page_cgroup_zid(pc); |
| 233 | |
| 234 | return mem_cgroup_zoneinfo(mem, nid, zid); |
| 235 | } |
| 236 | |
| 237 | static unsigned long mem_cgroup_get_all_zonestat(struct mem_cgroup *mem, |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 238 | enum lru_list idx) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 239 | { |
| 240 | int nid, zid; |
| 241 | struct mem_cgroup_per_zone *mz; |
| 242 | u64 total = 0; |
| 243 | |
| 244 | for_each_online_node(nid) |
| 245 | for (zid = 0; zid < MAX_NR_ZONES; zid++) { |
| 246 | mz = mem_cgroup_zoneinfo(mem, nid, zid); |
| 247 | total += MEM_CGROUP_ZSTAT(mz, idx); |
| 248 | } |
| 249 | return total; |
KAMEZAWA Hiroyuki | d52aa41 | 2008-02-07 00:14:24 -0800 | [diff] [blame] | 250 | } |
| 251 | |
Hugh Dickins | d5b69e3 | 2008-03-04 14:29:10 -0800 | [diff] [blame] | 252 | static struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 253 | { |
| 254 | return container_of(cgroup_subsys_state(cont, |
| 255 | mem_cgroup_subsys_id), struct mem_cgroup, |
| 256 | css); |
| 257 | } |
| 258 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 259 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p) |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 260 | { |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 261 | /* |
| 262 | * mm_update_next_owner() may clear mm->owner to NULL |
| 263 | * if it races with swapoff, page migration, etc. |
| 264 | * So this can be called with p == NULL. |
| 265 | */ |
| 266 | if (unlikely(!p)) |
| 267 | return NULL; |
| 268 | |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 269 | return container_of(task_subsys_state(p, mem_cgroup_subsys_id), |
| 270 | struct mem_cgroup, css); |
| 271 | } |
| 272 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 273 | /* |
| 274 | * Following LRU functions are allowed to be used without PCG_LOCK. |
| 275 | * Operations are called by routine of global LRU independently from memcg. |
| 276 | * What we have to take care of here is validness of pc->mem_cgroup. |
| 277 | * |
| 278 | * Changes to pc->mem_cgroup happens when |
| 279 | * 1. charge |
| 280 | * 2. moving account |
| 281 | * In typical case, "charge" is done before add-to-lru. Exception is SwapCache. |
| 282 | * It is added to LRU before charge. |
| 283 | * If PCG_USED bit is not set, page_cgroup is not added to this private LRU. |
| 284 | * When moving account, the page is not on LRU. It's isolated. |
| 285 | */ |
| 286 | |
| 287 | 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] | 288 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 289 | struct page_cgroup *pc; |
| 290 | struct mem_cgroup *mem; |
| 291 | struct mem_cgroup_per_zone *mz; |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 292 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 293 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 294 | return; |
| 295 | pc = lookup_page_cgroup(page); |
| 296 | /* can happen while we handle swapcache. */ |
| 297 | if (list_empty(&pc->lru)) |
| 298 | return; |
| 299 | mz = page_cgroup_zoneinfo(pc); |
| 300 | mem = pc->mem_cgroup; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 301 | MEM_CGROUP_ZSTAT(mz, lru) -= 1; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 302 | list_del_init(&pc->lru); |
| 303 | return; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 304 | } |
| 305 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 306 | void mem_cgroup_del_lru(struct page *page) |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 307 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 308 | mem_cgroup_del_lru_list(page, page_lru(page)); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 309 | } |
| 310 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 311 | 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] | 312 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 313 | struct mem_cgroup_per_zone *mz; |
| 314 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 315 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 316 | if (mem_cgroup_disabled()) |
Lee Schermerhorn | 894bc31 | 2008-10-18 20:26:39 -0700 | [diff] [blame] | 317 | return; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 318 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 319 | pc = lookup_page_cgroup(page); |
| 320 | smp_rmb(); |
| 321 | /* unused page is not rotated. */ |
| 322 | if (!PageCgroupUsed(pc)) |
| 323 | return; |
| 324 | mz = page_cgroup_zoneinfo(pc); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 325 | list_move(&pc->lru, &mz->lists[lru]); |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 326 | } |
| 327 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 328 | void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru) |
| 329 | { |
| 330 | struct page_cgroup *pc; |
| 331 | struct mem_cgroup_per_zone *mz; |
| 332 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 333 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 334 | return; |
| 335 | pc = lookup_page_cgroup(page); |
| 336 | /* barrier to sync with "charge" */ |
| 337 | smp_rmb(); |
| 338 | if (!PageCgroupUsed(pc)) |
| 339 | return; |
| 340 | |
| 341 | mz = page_cgroup_zoneinfo(pc); |
| 342 | MEM_CGROUP_ZSTAT(mz, lru) += 1; |
| 343 | list_add(&pc->lru, &mz->lists[lru]); |
| 344 | } |
| 345 | /* |
| 346 | * To add swapcache into LRU. Be careful to all this function. |
| 347 | * zone->lru_lock shouldn't be held and irq must not be disabled. |
| 348 | */ |
| 349 | static void mem_cgroup_lru_fixup(struct page *page) |
| 350 | { |
| 351 | if (!isolate_lru_page(page)) |
| 352 | putback_lru_page(page); |
| 353 | } |
| 354 | |
| 355 | void mem_cgroup_move_lists(struct page *page, |
| 356 | enum lru_list from, enum lru_list to) |
| 357 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 358 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 359 | return; |
| 360 | mem_cgroup_del_lru_list(page, from); |
| 361 | mem_cgroup_add_lru_list(page, to); |
| 362 | } |
| 363 | |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 364 | int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem) |
| 365 | { |
| 366 | int ret; |
| 367 | |
| 368 | task_lock(task); |
Hugh Dickins | bd845e3 | 2008-03-04 14:29:01 -0800 | [diff] [blame] | 369 | ret = task->mm && mm_match_cgroup(task->mm, mem); |
David Rientjes | 4c4a221 | 2008-02-07 00:14:06 -0800 | [diff] [blame] | 370 | task_unlock(task); |
| 371 | return ret; |
| 372 | } |
| 373 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 374 | /* |
KAMEZAWA Hiroyuki | 58ae83d | 2008-02-07 00:14:32 -0800 | [diff] [blame] | 375 | * Calculate mapped_ratio under memory controller. This will be used in |
| 376 | * vmscan.c for deteremining we have to reclaim mapped pages. |
| 377 | */ |
| 378 | int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem) |
| 379 | { |
| 380 | long total, rss; |
| 381 | |
| 382 | /* |
| 383 | * usage is recorded in bytes. But, here, we assume the number of |
| 384 | * physical pages can be represented by "long" on any arch. |
| 385 | */ |
| 386 | total = (long) (mem->res.usage >> PAGE_SHIFT) + 1L; |
| 387 | rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS); |
| 388 | return (int)((rss * 100L) / total); |
| 389 | } |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 390 | |
KAMEZAWA Hiroyuki | 5932f36 | 2008-02-07 00:14:33 -0800 | [diff] [blame] | 391 | /* |
KAMEZAWA Hiroyuki | 6c48a1d | 2008-02-07 00:14:34 -0800 | [diff] [blame] | 392 | * prev_priority control...this will be used in memory reclaim path. |
| 393 | */ |
| 394 | int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem) |
| 395 | { |
| 396 | return mem->prev_priority; |
| 397 | } |
| 398 | |
| 399 | void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority) |
| 400 | { |
| 401 | if (priority < mem->prev_priority) |
| 402 | mem->prev_priority = priority; |
| 403 | } |
| 404 | |
| 405 | void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority) |
| 406 | { |
| 407 | mem->prev_priority = priority; |
| 408 | } |
| 409 | |
KAMEZAWA Hiroyuki | cc38108 | 2008-02-07 00:14:35 -0800 | [diff] [blame] | 410 | /* |
| 411 | * Calculate # of pages to be scanned in this priority/zone. |
| 412 | * See also vmscan.c |
| 413 | * |
| 414 | * priority starts from "DEF_PRIORITY" and decremented in each loop. |
| 415 | * (see include/linux/mmzone.h) |
| 416 | */ |
| 417 | |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 418 | long mem_cgroup_calc_reclaim(struct mem_cgroup *mem, struct zone *zone, |
| 419 | int priority, enum lru_list lru) |
KAMEZAWA Hiroyuki | cc38108 | 2008-02-07 00:14:35 -0800 | [diff] [blame] | 420 | { |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 421 | long nr_pages; |
KAMEZAWA Hiroyuki | cc38108 | 2008-02-07 00:14:35 -0800 | [diff] [blame] | 422 | int nid = zone->zone_pgdat->node_id; |
| 423 | int zid = zone_idx(zone); |
| 424 | struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(mem, nid, zid); |
| 425 | |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 426 | nr_pages = MEM_CGROUP_ZSTAT(mz, lru); |
KAMEZAWA Hiroyuki | cc38108 | 2008-02-07 00:14:35 -0800 | [diff] [blame] | 427 | |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 428 | return (nr_pages >> priority); |
KAMEZAWA Hiroyuki | cc38108 | 2008-02-07 00:14:35 -0800 | [diff] [blame] | 429 | } |
| 430 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 431 | unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, |
| 432 | struct list_head *dst, |
| 433 | unsigned long *scanned, int order, |
| 434 | int mode, struct zone *z, |
| 435 | struct mem_cgroup *mem_cont, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 436 | int active, int file) |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 437 | { |
| 438 | unsigned long nr_taken = 0; |
| 439 | struct page *page; |
| 440 | unsigned long scan; |
| 441 | LIST_HEAD(pc_list); |
| 442 | struct list_head *src; |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 443 | struct page_cgroup *pc, *tmp; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 444 | int nid = z->zone_pgdat->node_id; |
| 445 | int zid = zone_idx(z); |
| 446 | struct mem_cgroup_per_zone *mz; |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 447 | int lru = LRU_FILE * !!file + !!active; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 448 | |
Balbir Singh | cf475ad | 2008-04-29 01:00:16 -0700 | [diff] [blame] | 449 | BUG_ON(!mem_cont); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 450 | mz = mem_cgroup_zoneinfo(mem_cont, nid, zid); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 451 | src = &mz->lists[lru]; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 452 | |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 453 | scan = 0; |
| 454 | list_for_each_entry_safe_reverse(pc, tmp, src, lru) { |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 455 | if (scan >= nr_to_scan) |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 456 | break; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 457 | |
| 458 | page = pc->page; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 459 | if (unlikely(!PageCgroupUsed(pc))) |
| 460 | continue; |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 461 | if (unlikely(!PageLRU(page))) |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 462 | continue; |
KAMEZAWA Hiroyuki | ff7283f | 2008-02-07 00:14:11 -0800 | [diff] [blame] | 463 | |
Hugh Dickins | 436c6541 | 2008-02-07 00:14:12 -0800 | [diff] [blame] | 464 | scan++; |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 465 | if (__isolate_lru_page(page, mode, file) == 0) { |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 466 | list_move(&page->lru, dst); |
| 467 | nr_taken++; |
| 468 | } |
| 469 | } |
| 470 | |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 471 | *scanned = scan; |
| 472 | return nr_taken; |
| 473 | } |
| 474 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 475 | #define mem_cgroup_from_res_counter(counter, member) \ |
| 476 | container_of(counter, struct mem_cgroup, member) |
| 477 | |
| 478 | /* |
| 479 | * This routine finds the DFS walk successor. This routine should be |
| 480 | * called with cgroup_mutex held |
| 481 | */ |
| 482 | static struct mem_cgroup * |
| 483 | mem_cgroup_get_next_node(struct mem_cgroup *curr, struct mem_cgroup *root_mem) |
| 484 | { |
| 485 | struct cgroup *cgroup, *curr_cgroup, *root_cgroup; |
| 486 | |
| 487 | curr_cgroup = curr->css.cgroup; |
| 488 | root_cgroup = root_mem->css.cgroup; |
| 489 | |
| 490 | if (!list_empty(&curr_cgroup->children)) { |
| 491 | /* |
| 492 | * Walk down to children |
| 493 | */ |
| 494 | mem_cgroup_put(curr); |
| 495 | cgroup = list_entry(curr_cgroup->children.next, |
| 496 | struct cgroup, sibling); |
| 497 | curr = mem_cgroup_from_cont(cgroup); |
| 498 | mem_cgroup_get(curr); |
| 499 | goto done; |
| 500 | } |
| 501 | |
| 502 | visit_parent: |
| 503 | if (curr_cgroup == root_cgroup) { |
| 504 | mem_cgroup_put(curr); |
| 505 | curr = root_mem; |
| 506 | mem_cgroup_get(curr); |
| 507 | goto done; |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * Goto next sibling |
| 512 | */ |
| 513 | if (curr_cgroup->sibling.next != &curr_cgroup->parent->children) { |
| 514 | mem_cgroup_put(curr); |
| 515 | cgroup = list_entry(curr_cgroup->sibling.next, struct cgroup, |
| 516 | sibling); |
| 517 | curr = mem_cgroup_from_cont(cgroup); |
| 518 | mem_cgroup_get(curr); |
| 519 | goto done; |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Go up to next parent and next parent's sibling if need be |
| 524 | */ |
| 525 | curr_cgroup = curr_cgroup->parent; |
| 526 | goto visit_parent; |
| 527 | |
| 528 | done: |
| 529 | root_mem->last_scanned_child = curr; |
| 530 | return curr; |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * Visit the first child (need not be the first child as per the ordering |
| 535 | * of the cgroup list, since we track last_scanned_child) of @mem and use |
| 536 | * that to reclaim free pages from. |
| 537 | */ |
| 538 | static struct mem_cgroup * |
| 539 | mem_cgroup_get_first_node(struct mem_cgroup *root_mem) |
| 540 | { |
| 541 | struct cgroup *cgroup; |
| 542 | struct mem_cgroup *ret; |
| 543 | bool obsolete = (root_mem->last_scanned_child && |
| 544 | root_mem->last_scanned_child->obsolete); |
| 545 | |
| 546 | /* |
| 547 | * Scan all children under the mem_cgroup mem |
| 548 | */ |
| 549 | cgroup_lock(); |
| 550 | if (list_empty(&root_mem->css.cgroup->children)) { |
| 551 | ret = root_mem; |
| 552 | goto done; |
| 553 | } |
| 554 | |
| 555 | if (!root_mem->last_scanned_child || obsolete) { |
| 556 | |
| 557 | if (obsolete) |
| 558 | mem_cgroup_put(root_mem->last_scanned_child); |
| 559 | |
| 560 | cgroup = list_first_entry(&root_mem->css.cgroup->children, |
| 561 | struct cgroup, sibling); |
| 562 | ret = mem_cgroup_from_cont(cgroup); |
| 563 | mem_cgroup_get(ret); |
| 564 | } else |
| 565 | ret = mem_cgroup_get_next_node(root_mem->last_scanned_child, |
| 566 | root_mem); |
| 567 | |
| 568 | done: |
| 569 | root_mem->last_scanned_child = ret; |
| 570 | cgroup_unlock(); |
| 571 | return ret; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * Dance down the hierarchy if needed to reclaim memory. We remember the |
| 576 | * last child we reclaimed from, so that we don't end up penalizing |
| 577 | * one child extensively based on its position in the children list. |
| 578 | * |
| 579 | * root_mem is the original ancestor that we've been reclaim from. |
| 580 | */ |
| 581 | static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem, |
| 582 | gfp_t gfp_mask, bool noswap) |
| 583 | { |
| 584 | struct mem_cgroup *next_mem; |
| 585 | int ret = 0; |
| 586 | |
| 587 | /* |
| 588 | * Reclaim unconditionally and don't check for return value. |
| 589 | * We need to reclaim in the current group and down the tree. |
| 590 | * One might think about checking for children before reclaiming, |
| 591 | * but there might be left over accounting, even after children |
| 592 | * have left. |
| 593 | */ |
| 594 | ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap); |
| 595 | if (res_counter_check_under_limit(&root_mem->res)) |
| 596 | return 0; |
| 597 | |
| 598 | next_mem = mem_cgroup_get_first_node(root_mem); |
| 599 | |
| 600 | while (next_mem != root_mem) { |
| 601 | if (next_mem->obsolete) { |
| 602 | mem_cgroup_put(next_mem); |
| 603 | cgroup_lock(); |
| 604 | next_mem = mem_cgroup_get_first_node(root_mem); |
| 605 | cgroup_unlock(); |
| 606 | continue; |
| 607 | } |
| 608 | ret = try_to_free_mem_cgroup_pages(next_mem, gfp_mask, noswap); |
| 609 | if (res_counter_check_under_limit(&root_mem->res)) |
| 610 | return 0; |
| 611 | cgroup_lock(); |
| 612 | next_mem = mem_cgroup_get_next_node(next_mem, root_mem); |
| 613 | cgroup_unlock(); |
| 614 | } |
| 615 | return ret; |
| 616 | } |
| 617 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 618 | /* |
| 619 | * Unlike exported interface, "oom" parameter is added. if oom==true, |
| 620 | * oom-killer can be invoked. |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 621 | */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 622 | static int __mem_cgroup_try_charge(struct mm_struct *mm, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 623 | gfp_t gfp_mask, struct mem_cgroup **memcg, |
| 624 | bool oom) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 625 | { |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 626 | struct mem_cgroup *mem, *mem_over_limit; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 627 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 628 | struct res_counter *fail_res; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 629 | /* |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 630 | * We always charge the cgroup the mm_struct belongs to. |
| 631 | * The mm_struct's mem_cgroup changes on task migration if the |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 632 | * thread group leader migrates. It's possible that mm is not |
| 633 | * set, if so charge the init_mm (happens for pagecache usage). |
| 634 | */ |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 635 | if (likely(!*memcg)) { |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 636 | rcu_read_lock(); |
| 637 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 638 | if (unlikely(!mem)) { |
| 639 | rcu_read_unlock(); |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 640 | return 0; |
| 641 | } |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 642 | /* |
| 643 | * For every charge from the cgroup, increment reference count |
| 644 | */ |
| 645 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 646 | *memcg = mem; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 647 | rcu_read_unlock(); |
| 648 | } else { |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 649 | mem = *memcg; |
| 650 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 651 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 652 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 653 | while (1) { |
| 654 | int ret; |
| 655 | bool noswap = false; |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 656 | |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 657 | ret = res_counter_charge(&mem->res, PAGE_SIZE, &fail_res); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 658 | if (likely(!ret)) { |
| 659 | if (!do_swap_account) |
| 660 | break; |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 661 | ret = res_counter_charge(&mem->memsw, PAGE_SIZE, |
| 662 | &fail_res); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 663 | if (likely(!ret)) |
| 664 | break; |
| 665 | /* mem+swap counter fails */ |
| 666 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
| 667 | noswap = true; |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 668 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, |
| 669 | memsw); |
| 670 | } else |
| 671 | /* mem counter fails */ |
| 672 | mem_over_limit = mem_cgroup_from_res_counter(fail_res, |
| 673 | res); |
| 674 | |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 675 | if (!(gfp_mask & __GFP_WAIT)) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 676 | goto nomem; |
Balbir Singh | e1a1cd5 | 2008-02-07 00:14:02 -0800 | [diff] [blame] | 677 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 678 | ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, gfp_mask, |
| 679 | noswap); |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 680 | |
| 681 | /* |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 682 | * try_to_free_mem_cgroup_pages() might not give us a full |
| 683 | * picture of reclaim. Some pages are reclaimed and might be |
| 684 | * moved to swap cache or just unmapped from the cgroup. |
| 685 | * Check the limit again to see if the reclaim reduced the |
| 686 | * current usage of the cgroup before giving up |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 687 | * |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 688 | */ |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 689 | if (!do_swap_account && |
| 690 | res_counter_check_under_limit(&mem->res)) |
| 691 | continue; |
| 692 | if (do_swap_account && |
| 693 | res_counter_check_under_limit(&mem->memsw)) |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 694 | continue; |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 695 | |
| 696 | if (!nr_retries--) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 697 | if (oom) |
| 698 | mem_cgroup_out_of_memory(mem, gfp_mask); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 699 | goto nomem; |
Balbir Singh | 66e1707 | 2008-02-07 00:13:56 -0800 | [diff] [blame] | 700 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 701 | } |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 702 | return 0; |
| 703 | nomem: |
| 704 | css_put(&mem->css); |
| 705 | return -ENOMEM; |
| 706 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 707 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 708 | /** |
| 709 | * mem_cgroup_try_charge - get charge of PAGE_SIZE. |
| 710 | * @mm: an mm_struct which is charged against. (when *memcg is NULL) |
| 711 | * @gfp_mask: gfp_mask for reclaim. |
| 712 | * @memcg: a pointer to memory cgroup which is charged against. |
| 713 | * |
| 714 | * charge against memory cgroup pointed by *memcg. if *memcg == NULL, estimated |
| 715 | * memory cgroup from @mm is got and stored in *memcg. |
| 716 | * |
| 717 | * Returns 0 if success. -ENOMEM at failure. |
| 718 | * This call can invoke OOM-Killer. |
| 719 | */ |
| 720 | |
| 721 | int mem_cgroup_try_charge(struct mm_struct *mm, |
| 722 | gfp_t mask, struct mem_cgroup **memcg) |
| 723 | { |
| 724 | return __mem_cgroup_try_charge(mm, mask, memcg, true); |
| 725 | } |
| 726 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 727 | /* |
| 728 | * commit a charge got by mem_cgroup_try_charge() and makes page_cgroup to be |
| 729 | * USED state. If already USED, uncharge and return. |
| 730 | */ |
| 731 | |
| 732 | static void __mem_cgroup_commit_charge(struct mem_cgroup *mem, |
| 733 | struct page_cgroup *pc, |
| 734 | enum charge_type ctype) |
| 735 | { |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 736 | /* try_charge() can return NULL to *memcg, taking care of it. */ |
| 737 | if (!mem) |
| 738 | return; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 739 | |
| 740 | lock_page_cgroup(pc); |
| 741 | if (unlikely(PageCgroupUsed(pc))) { |
| 742 | unlock_page_cgroup(pc); |
| 743 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 744 | if (do_swap_account) |
| 745 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 746 | css_put(&mem->css); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 747 | return; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 748 | } |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 749 | pc->mem_cgroup = mem; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 750 | smp_wmb(); |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 751 | pc->flags = pcg_default_flags[ctype]; |
Hugh Dickins | 3be9127 | 2008-02-07 00:14:19 -0800 | [diff] [blame] | 752 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 753 | mem_cgroup_charge_statistics(mem, pc, true); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 754 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 755 | unlock_page_cgroup(pc); |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 756 | } |
| 757 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 758 | /** |
| 759 | * mem_cgroup_move_account - move account of the page |
| 760 | * @pc: page_cgroup of the page. |
| 761 | * @from: mem_cgroup which the page is moved from. |
| 762 | * @to: mem_cgroup which the page is moved to. @from != @to. |
| 763 | * |
| 764 | * The caller must confirm following. |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 765 | * - page is not on LRU (isolate_page() is useful.) |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 766 | * |
| 767 | * returns 0 at success, |
| 768 | * returns -EBUSY when lock is busy or "pc" is unstable. |
| 769 | * |
| 770 | * This function does "uncharge" from old cgroup but doesn't do "charge" to |
| 771 | * new cgroup. It should be done by a caller. |
| 772 | */ |
| 773 | |
| 774 | static int mem_cgroup_move_account(struct page_cgroup *pc, |
| 775 | struct mem_cgroup *from, struct mem_cgroup *to) |
| 776 | { |
| 777 | struct mem_cgroup_per_zone *from_mz, *to_mz; |
| 778 | int nid, zid; |
| 779 | int ret = -EBUSY; |
| 780 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 781 | VM_BUG_ON(from == to); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 782 | VM_BUG_ON(PageLRU(pc->page)); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 783 | |
| 784 | nid = page_cgroup_nid(pc); |
| 785 | zid = page_cgroup_zid(pc); |
| 786 | from_mz = mem_cgroup_zoneinfo(from, nid, zid); |
| 787 | to_mz = mem_cgroup_zoneinfo(to, nid, zid); |
| 788 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 789 | if (!trylock_page_cgroup(pc)) |
| 790 | return ret; |
| 791 | |
| 792 | if (!PageCgroupUsed(pc)) |
| 793 | goto out; |
| 794 | |
| 795 | if (pc->mem_cgroup != from) |
| 796 | goto out; |
| 797 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 798 | css_put(&from->css); |
| 799 | res_counter_uncharge(&from->res, PAGE_SIZE); |
| 800 | mem_cgroup_charge_statistics(from, pc, false); |
| 801 | if (do_swap_account) |
| 802 | res_counter_uncharge(&from->memsw, PAGE_SIZE); |
| 803 | pc->mem_cgroup = to; |
| 804 | mem_cgroup_charge_statistics(to, pc, true); |
| 805 | css_get(&to->css); |
| 806 | ret = 0; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 807 | out: |
| 808 | unlock_page_cgroup(pc); |
| 809 | return ret; |
| 810 | } |
| 811 | |
| 812 | /* |
| 813 | * move charges to its parent. |
| 814 | */ |
| 815 | |
| 816 | static int mem_cgroup_move_parent(struct page_cgroup *pc, |
| 817 | struct mem_cgroup *child, |
| 818 | gfp_t gfp_mask) |
| 819 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 820 | struct page *page = pc->page; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 821 | struct cgroup *cg = child->css.cgroup; |
| 822 | struct cgroup *pcg = cg->parent; |
| 823 | struct mem_cgroup *parent; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 824 | int ret; |
| 825 | |
| 826 | /* Is ROOT ? */ |
| 827 | if (!pcg) |
| 828 | return -EINVAL; |
| 829 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 830 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 831 | parent = mem_cgroup_from_cont(pcg); |
| 832 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 833 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 834 | ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false); |
| 835 | if (ret) |
| 836 | return ret; |
| 837 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 838 | if (!get_page_unless_zero(page)) |
| 839 | return -EBUSY; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 840 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 841 | ret = isolate_lru_page(page); |
| 842 | |
| 843 | if (ret) |
| 844 | goto cancel; |
| 845 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 846 | ret = mem_cgroup_move_account(pc, child, parent); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 847 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 848 | /* drop extra refcnt by try_charge() (move_account increment one) */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 849 | css_put(&parent->css); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 850 | putback_lru_page(page); |
| 851 | if (!ret) { |
| 852 | put_page(page); |
| 853 | return 0; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 854 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 855 | /* uncharge if move fails */ |
| 856 | cancel: |
| 857 | res_counter_uncharge(&parent->res, PAGE_SIZE); |
| 858 | if (do_swap_account) |
| 859 | res_counter_uncharge(&parent->memsw, PAGE_SIZE); |
| 860 | put_page(page); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 861 | return ret; |
| 862 | } |
| 863 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 864 | /* |
| 865 | * Charge the memory controller for page usage. |
| 866 | * Return |
| 867 | * 0 if the charge was successful |
| 868 | * < 0 if the cgroup is over its limit |
| 869 | */ |
| 870 | static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, |
| 871 | gfp_t gfp_mask, enum charge_type ctype, |
| 872 | struct mem_cgroup *memcg) |
| 873 | { |
| 874 | struct mem_cgroup *mem; |
| 875 | struct page_cgroup *pc; |
| 876 | int ret; |
| 877 | |
| 878 | pc = lookup_page_cgroup(page); |
| 879 | /* can happen at boot */ |
| 880 | if (unlikely(!pc)) |
| 881 | return 0; |
| 882 | prefetchw(pc); |
| 883 | |
| 884 | mem = memcg; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 885 | ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 886 | if (ret) |
| 887 | return ret; |
| 888 | |
| 889 | __mem_cgroup_commit_charge(mem, pc, ctype); |
| 890 | return 0; |
| 891 | } |
| 892 | |
| 893 | int mem_cgroup_newpage_charge(struct page *page, |
| 894 | struct mm_struct *mm, gfp_t gfp_mask) |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 895 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 896 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 897 | return 0; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 898 | if (PageCompound(page)) |
| 899 | return 0; |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 900 | /* |
| 901 | * If already mapped, we don't have to account. |
| 902 | * If page cache, page->mapping has address_space. |
| 903 | * But page->mapping may have out-of-use anon_vma pointer, |
| 904 | * detecit it by PageAnon() check. newly-mapped-anon's page->mapping |
| 905 | * is NULL. |
| 906 | */ |
| 907 | if (page_mapped(page) || (page->mapping && !PageAnon(page))) |
| 908 | return 0; |
| 909 | if (unlikely(!mm)) |
| 910 | mm = &init_mm; |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 911 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 912 | MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL); |
KAMEZAWA Hiroyuki | 217bc31 | 2008-02-07 00:14:17 -0800 | [diff] [blame] | 913 | } |
| 914 | |
Balbir Singh | e1a1cd5 | 2008-02-07 00:14:02 -0800 | [diff] [blame] | 915 | int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, |
| 916 | gfp_t gfp_mask) |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 917 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 918 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 919 | return 0; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 920 | if (PageCompound(page)) |
| 921 | return 0; |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 922 | /* |
| 923 | * Corner case handling. This is called from add_to_page_cache() |
| 924 | * in usual. But some FS (shmem) precharges this page before calling it |
| 925 | * and call add_to_page_cache() with GFP_NOWAIT. |
| 926 | * |
| 927 | * For GFP_NOWAIT case, the page may be pre-charged before calling |
| 928 | * add_to_page_cache(). (See shmem.c) check it here and avoid to call |
| 929 | * charge twice. (It works but has to pay a bit larger cost.) |
| 930 | */ |
| 931 | if (!(gfp_mask & __GFP_WAIT)) { |
| 932 | struct page_cgroup *pc; |
| 933 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 934 | |
| 935 | pc = lookup_page_cgroup(page); |
| 936 | if (!pc) |
| 937 | return 0; |
| 938 | lock_page_cgroup(pc); |
| 939 | if (PageCgroupUsed(pc)) { |
| 940 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 941 | return 0; |
| 942 | } |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 943 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 944 | } |
| 945 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 946 | if (unlikely(!mm)) |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 947 | mm = &init_mm; |
KAMEZAWA Hiroyuki | accf163 | 2008-07-25 01:47:17 -0700 | [diff] [blame] | 948 | |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 949 | if (page_is_file_cache(page)) |
| 950 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 951 | MEM_CGROUP_CHARGE_TYPE_CACHE, NULL); |
KAMEZAWA Hiroyuki | c05555b | 2008-10-18 20:28:11 -0700 | [diff] [blame] | 952 | else |
| 953 | return mem_cgroup_charge_common(page, mm, gfp_mask, |
| 954 | MEM_CGROUP_CHARGE_TYPE_SHMEM, NULL); |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 955 | } |
| 956 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 957 | int mem_cgroup_try_charge_swapin(struct mm_struct *mm, |
| 958 | struct page *page, |
| 959 | gfp_t mask, struct mem_cgroup **ptr) |
| 960 | { |
| 961 | struct mem_cgroup *mem; |
| 962 | swp_entry_t ent; |
| 963 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 964 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 965 | return 0; |
| 966 | |
| 967 | if (!do_swap_account) |
| 968 | goto charge_cur_mm; |
| 969 | |
| 970 | /* |
| 971 | * A racing thread's fault, or swapoff, may have already updated |
| 972 | * the pte, and even removed page from swap cache: return success |
| 973 | * to go on to do_swap_page()'s pte_same() test, which should fail. |
| 974 | */ |
| 975 | if (!PageSwapCache(page)) |
| 976 | return 0; |
| 977 | |
| 978 | ent.val = page_private(page); |
| 979 | |
| 980 | mem = lookup_swap_cgroup(ent); |
| 981 | if (!mem || mem->obsolete) |
| 982 | goto charge_cur_mm; |
| 983 | *ptr = mem; |
| 984 | return __mem_cgroup_try_charge(NULL, mask, ptr, true); |
| 985 | charge_cur_mm: |
| 986 | if (unlikely(!mm)) |
| 987 | mm = &init_mm; |
| 988 | return __mem_cgroup_try_charge(mm, mask, ptr, true); |
| 989 | } |
| 990 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 991 | #ifdef CONFIG_SWAP |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 992 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 993 | int mem_cgroup_cache_charge_swapin(struct page *page, |
| 994 | struct mm_struct *mm, gfp_t mask, bool locked) |
| 995 | { |
| 996 | int ret = 0; |
| 997 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 998 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 999 | return 0; |
| 1000 | if (unlikely(!mm)) |
| 1001 | mm = &init_mm; |
| 1002 | if (!locked) |
| 1003 | lock_page(page); |
| 1004 | /* |
| 1005 | * If not locked, the page can be dropped from SwapCache until |
| 1006 | * we reach here. |
| 1007 | */ |
| 1008 | if (PageSwapCache(page)) { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1009 | struct mem_cgroup *mem = NULL; |
| 1010 | swp_entry_t ent; |
| 1011 | |
| 1012 | ent.val = page_private(page); |
| 1013 | if (do_swap_account) { |
| 1014 | mem = lookup_swap_cgroup(ent); |
| 1015 | if (mem && mem->obsolete) |
| 1016 | mem = NULL; |
| 1017 | if (mem) |
| 1018 | mm = NULL; |
| 1019 | } |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1020 | ret = mem_cgroup_charge_common(page, mm, mask, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1021 | MEM_CGROUP_CHARGE_TYPE_SHMEM, mem); |
| 1022 | |
| 1023 | if (!ret && do_swap_account) { |
| 1024 | /* avoid double counting */ |
| 1025 | mem = swap_cgroup_record(ent, NULL); |
| 1026 | if (mem) { |
| 1027 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
| 1028 | mem_cgroup_put(mem); |
| 1029 | } |
| 1030 | } |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1031 | } |
| 1032 | if (!locked) |
| 1033 | unlock_page(page); |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1034 | /* add this page(page_cgroup) to the LRU we want. */ |
| 1035 | mem_cgroup_lru_fixup(page); |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1036 | |
| 1037 | return ret; |
| 1038 | } |
| 1039 | #endif |
| 1040 | |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1041 | void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr) |
| 1042 | { |
| 1043 | struct page_cgroup *pc; |
| 1044 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1045 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1046 | return; |
| 1047 | if (!ptr) |
| 1048 | return; |
| 1049 | pc = lookup_page_cgroup(page); |
| 1050 | __mem_cgroup_commit_charge(ptr, pc, MEM_CGROUP_CHARGE_TYPE_MAPPED); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1051 | /* |
| 1052 | * Now swap is on-memory. This means this page may be |
| 1053 | * counted both as mem and swap....double count. |
| 1054 | * Fix it by uncharging from memsw. This SwapCache is stable |
| 1055 | * because we're still under lock_page(). |
| 1056 | */ |
| 1057 | if (do_swap_account) { |
| 1058 | swp_entry_t ent = {.val = page_private(page)}; |
| 1059 | struct mem_cgroup *memcg; |
| 1060 | memcg = swap_cgroup_record(ent, NULL); |
| 1061 | if (memcg) { |
| 1062 | /* If memcg is obsolete, memcg can be != ptr */ |
| 1063 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
| 1064 | mem_cgroup_put(memcg); |
| 1065 | } |
| 1066 | |
| 1067 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1068 | /* add this page(page_cgroup) to the LRU we want. */ |
| 1069 | mem_cgroup_lru_fixup(page); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1070 | } |
| 1071 | |
| 1072 | void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem) |
| 1073 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1074 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1075 | return; |
| 1076 | if (!mem) |
| 1077 | return; |
| 1078 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1079 | if (do_swap_account) |
| 1080 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
KAMEZAWA Hiroyuki | 7a81b88 | 2009-01-07 18:07:48 -0800 | [diff] [blame] | 1081 | css_put(&mem->css); |
| 1082 | } |
| 1083 | |
| 1084 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1085 | /* |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1086 | * uncharge if !page_mapped(page) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1087 | */ |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1088 | static struct mem_cgroup * |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1089 | __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype) |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1090 | { |
Hugh Dickins | 8289546 | 2008-03-04 14:29:08 -0800 | [diff] [blame] | 1091 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1092 | struct mem_cgroup *mem = NULL; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 1093 | struct mem_cgroup_per_zone *mz; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1094 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1095 | if (mem_cgroup_disabled()) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1096 | return NULL; |
Balbir Singh | 4077960 | 2008-04-04 14:29:59 -0700 | [diff] [blame] | 1097 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1098 | if (PageSwapCache(page)) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1099 | return NULL; |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1100 | |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1101 | /* |
Balbir Singh | 3c541e1 | 2008-02-07 00:14:41 -0800 | [diff] [blame] | 1102 | * Check if our page_cgroup is valid |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1103 | */ |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1104 | pc = lookup_page_cgroup(page); |
| 1105 | if (unlikely(!pc || !PageCgroupUsed(pc))) |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1106 | return NULL; |
Balbir Singh | 8a9f3cc | 2008-02-07 00:13:53 -0800 | [diff] [blame] | 1107 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1108 | lock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1109 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1110 | mem = pc->mem_cgroup; |
| 1111 | |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1112 | if (!PageCgroupUsed(pc)) |
| 1113 | goto unlock_out; |
| 1114 | |
| 1115 | switch (ctype) { |
| 1116 | case MEM_CGROUP_CHARGE_TYPE_MAPPED: |
| 1117 | if (page_mapped(page)) |
| 1118 | goto unlock_out; |
| 1119 | break; |
| 1120 | case MEM_CGROUP_CHARGE_TYPE_SWAPOUT: |
| 1121 | if (!PageAnon(page)) { /* Shared memory */ |
| 1122 | if (page->mapping && !page_is_file_cache(page)) |
| 1123 | goto unlock_out; |
| 1124 | } else if (page_mapped(page)) /* Anon */ |
| 1125 | goto unlock_out; |
| 1126 | break; |
| 1127 | default: |
| 1128 | break; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1129 | } |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1130 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1131 | res_counter_uncharge(&mem->res, PAGE_SIZE); |
| 1132 | if (do_swap_account && (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT)) |
| 1133 | res_counter_uncharge(&mem->memsw, PAGE_SIZE); |
| 1134 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1135 | mem_cgroup_charge_statistics(mem, pc, false); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1136 | ClearPageCgroupUsed(pc); |
Hugh Dickins | b9c565d | 2008-03-04 14:29:11 -0800 | [diff] [blame] | 1137 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1138 | mz = page_cgroup_zoneinfo(pc); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1139 | unlock_page_cgroup(pc); |
Hugh Dickins | fb59e9f | 2008-03-04 14:29:16 -0800 | [diff] [blame] | 1140 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1141 | css_put(&mem->css); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1142 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1143 | return mem; |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1144 | |
| 1145 | unlock_out: |
| 1146 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1147 | return NULL; |
Balbir Singh | 3c541e1 | 2008-02-07 00:14:41 -0800 | [diff] [blame] | 1148 | } |
| 1149 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1150 | void mem_cgroup_uncharge_page(struct page *page) |
| 1151 | { |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1152 | /* early check. */ |
| 1153 | if (page_mapped(page)) |
| 1154 | return; |
| 1155 | if (page->mapping && !PageAnon(page)) |
| 1156 | return; |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1157 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED); |
| 1158 | } |
| 1159 | |
| 1160 | void mem_cgroup_uncharge_cache_page(struct page *page) |
| 1161 | { |
| 1162 | VM_BUG_ON(page_mapped(page)); |
KAMEZAWA Hiroyuki | b7abea9 | 2008-10-18 20:28:09 -0700 | [diff] [blame] | 1163 | VM_BUG_ON(page->mapping); |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1164 | __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE); |
| 1165 | } |
| 1166 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1167 | /* |
| 1168 | * called from __delete_from_swap_cache() and drop "page" account. |
| 1169 | * memcg information is recorded to swap_cgroup of "ent" |
| 1170 | */ |
| 1171 | void mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent) |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1172 | { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1173 | struct mem_cgroup *memcg; |
| 1174 | |
| 1175 | memcg = __mem_cgroup_uncharge_common(page, |
| 1176 | MEM_CGROUP_CHARGE_TYPE_SWAPOUT); |
| 1177 | /* record memcg information */ |
| 1178 | if (do_swap_account && memcg) { |
| 1179 | swap_cgroup_record(ent, memcg); |
| 1180 | mem_cgroup_get(memcg); |
| 1181 | } |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1182 | } |
| 1183 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1184 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 1185 | /* |
| 1186 | * called from swap_entry_free(). remove record in swap_cgroup and |
| 1187 | * uncharge "memsw" account. |
| 1188 | */ |
| 1189 | void mem_cgroup_uncharge_swap(swp_entry_t ent) |
| 1190 | { |
| 1191 | struct mem_cgroup *memcg; |
| 1192 | |
| 1193 | if (!do_swap_account) |
| 1194 | return; |
| 1195 | |
| 1196 | memcg = swap_cgroup_record(ent, NULL); |
| 1197 | if (memcg) { |
| 1198 | res_counter_uncharge(&memcg->memsw, PAGE_SIZE); |
| 1199 | mem_cgroup_put(memcg); |
| 1200 | } |
| 1201 | } |
| 1202 | #endif |
| 1203 | |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 1204 | /* |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1205 | * Before starting migration, account PAGE_SIZE to mem_cgroup that the old |
| 1206 | * page belongs to. |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 1207 | */ |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1208 | int mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr) |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 1209 | { |
| 1210 | struct page_cgroup *pc; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1211 | struct mem_cgroup *mem = NULL; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1212 | int ret = 0; |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 1213 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1214 | if (mem_cgroup_disabled()) |
Balbir Singh | 4077960 | 2008-04-04 14:29:59 -0700 | [diff] [blame] | 1215 | return 0; |
| 1216 | |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1217 | pc = lookup_page_cgroup(page); |
| 1218 | lock_page_cgroup(pc); |
| 1219 | if (PageCgroupUsed(pc)) { |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1220 | mem = pc->mem_cgroup; |
| 1221 | css_get(&mem->css); |
Hugh Dickins | b9c565d | 2008-03-04 14:29:11 -0800 | [diff] [blame] | 1222 | } |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1223 | unlock_page_cgroup(pc); |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1224 | |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1225 | if (mem) { |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1226 | ret = mem_cgroup_try_charge(NULL, GFP_HIGHUSER_MOVABLE, &mem); |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1227 | css_put(&mem->css); |
| 1228 | } |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1229 | *ptr = mem; |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1230 | return ret; |
| 1231 | } |
Hugh Dickins | fb59e9f | 2008-03-04 14:29:16 -0800 | [diff] [blame] | 1232 | |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1233 | /* remove redundant charge if migration failed*/ |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1234 | void mem_cgroup_end_migration(struct mem_cgroup *mem, |
| 1235 | struct page *oldpage, struct page *newpage) |
KAMEZAWA Hiroyuki | e8589cc | 2008-07-25 01:47:10 -0700 | [diff] [blame] | 1236 | { |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1237 | struct page *target, *unused; |
| 1238 | struct page_cgroup *pc; |
| 1239 | enum charge_type ctype; |
| 1240 | |
| 1241 | if (!mem) |
| 1242 | return; |
| 1243 | |
| 1244 | /* at migration success, oldpage->mapping is NULL. */ |
| 1245 | if (oldpage->mapping) { |
| 1246 | target = oldpage; |
| 1247 | unused = NULL; |
| 1248 | } else { |
| 1249 | target = newpage; |
| 1250 | unused = oldpage; |
| 1251 | } |
| 1252 | |
| 1253 | if (PageAnon(target)) |
| 1254 | ctype = MEM_CGROUP_CHARGE_TYPE_MAPPED; |
| 1255 | else if (page_is_file_cache(target)) |
| 1256 | ctype = MEM_CGROUP_CHARGE_TYPE_CACHE; |
| 1257 | else |
| 1258 | ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM; |
| 1259 | |
| 1260 | /* unused page is not on radix-tree now. */ |
KAMEZAWA Hiroyuki | d13d144 | 2009-01-07 18:07:56 -0800 | [diff] [blame] | 1261 | if (unused) |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1262 | __mem_cgroup_uncharge_common(unused, ctype); |
| 1263 | |
| 1264 | pc = lookup_page_cgroup(target); |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1265 | /* |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1266 | * __mem_cgroup_commit_charge() check PCG_USED bit of page_cgroup. |
| 1267 | * So, double-counting is effectively avoided. |
KAMEZAWA Hiroyuki | 69029cd | 2008-07-25 01:47:14 -0700 | [diff] [blame] | 1268 | */ |
KAMEZAWA Hiroyuki | 01b1ae6 | 2009-01-07 18:07:50 -0800 | [diff] [blame] | 1269 | __mem_cgroup_commit_charge(mem, pc, ctype); |
| 1270 | |
| 1271 | /* |
| 1272 | * Both of oldpage and newpage are still under lock_page(). |
| 1273 | * Then, we don't have to care about race in radix-tree. |
| 1274 | * But we have to be careful that this page is unmapped or not. |
| 1275 | * |
| 1276 | * There is a case for !page_mapped(). At the start of |
| 1277 | * migration, oldpage was mapped. But now, it's zapped. |
| 1278 | * But we know *target* page is not freed/reused under us. |
| 1279 | * mem_cgroup_uncharge_page() does all necessary checks. |
| 1280 | */ |
| 1281 | if (ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED) |
| 1282 | mem_cgroup_uncharge_page(target); |
KAMEZAWA Hiroyuki | ae41be3 | 2008-02-07 00:14:10 -0800 | [diff] [blame] | 1283 | } |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 1284 | |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1285 | /* |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1286 | * A call to try to shrink memory usage under specified resource controller. |
| 1287 | * This is typically used for page reclaiming for shmem for reducing side |
| 1288 | * effect of page allocation from shmem, which is used by some mem_cgroup. |
| 1289 | */ |
| 1290 | int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask) |
| 1291 | { |
| 1292 | struct mem_cgroup *mem; |
| 1293 | int progress = 0; |
| 1294 | int retry = MEM_CGROUP_RECLAIM_RETRIES; |
| 1295 | |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1296 | if (mem_cgroup_disabled()) |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 1297 | return 0; |
Hugh Dickins | 9623e07 | 2008-08-12 15:08:41 -0700 | [diff] [blame] | 1298 | if (!mm) |
| 1299 | return 0; |
Li Zefan | cede86a | 2008-07-25 01:47:18 -0700 | [diff] [blame] | 1300 | |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1301 | rcu_read_lock(); |
| 1302 | mem = mem_cgroup_from_task(rcu_dereference(mm->owner)); |
Balbir Singh | 31a78f2 | 2008-09-28 23:09:31 +0100 | [diff] [blame] | 1303 | if (unlikely(!mem)) { |
| 1304 | rcu_read_unlock(); |
| 1305 | return 0; |
| 1306 | } |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1307 | css_get(&mem->css); |
| 1308 | rcu_read_unlock(); |
| 1309 | |
| 1310 | do { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1311 | progress = try_to_free_mem_cgroup_pages(mem, gfp_mask, true); |
Daisuke Nishimura | a10cebf | 2008-09-22 13:57:52 -0700 | [diff] [blame] | 1312 | progress += res_counter_check_under_limit(&mem->res); |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1313 | } while (!progress && --retry); |
| 1314 | |
| 1315 | css_put(&mem->css); |
| 1316 | if (!retry) |
| 1317 | return -ENOMEM; |
| 1318 | return 0; |
| 1319 | } |
| 1320 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1321 | static DEFINE_MUTEX(set_limit_mutex); |
| 1322 | |
KOSAKI Motohiro | d38d2a7 | 2009-01-06 14:39:44 -0800 | [diff] [blame] | 1323 | static int mem_cgroup_resize_limit(struct mem_cgroup *memcg, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1324 | unsigned long long val) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1325 | { |
| 1326 | |
| 1327 | int retry_count = MEM_CGROUP_RECLAIM_RETRIES; |
| 1328 | int progress; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1329 | u64 memswlimit; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1330 | int ret = 0; |
| 1331 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1332 | while (retry_count) { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1333 | if (signal_pending(current)) { |
| 1334 | ret = -EINTR; |
| 1335 | break; |
| 1336 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1337 | /* |
| 1338 | * Rather than hide all in some function, I do this in |
| 1339 | * open coded manner. You see what this really does. |
| 1340 | * We have to guarantee mem->res.limit < mem->memsw.limit. |
| 1341 | */ |
| 1342 | mutex_lock(&set_limit_mutex); |
| 1343 | memswlimit = res_counter_read_u64(&memcg->memsw, RES_LIMIT); |
| 1344 | if (memswlimit < val) { |
| 1345 | ret = -EINVAL; |
| 1346 | mutex_unlock(&set_limit_mutex); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1347 | break; |
| 1348 | } |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1349 | ret = res_counter_set_limit(&memcg->res, val); |
| 1350 | mutex_unlock(&set_limit_mutex); |
| 1351 | |
| 1352 | if (!ret) |
| 1353 | break; |
| 1354 | |
KAMEZAWA Hiroyuki | bced052 | 2009-01-07 18:07:49 -0800 | [diff] [blame] | 1355 | progress = try_to_free_mem_cgroup_pages(memcg, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1356 | GFP_HIGHUSER_MOVABLE, false); |
| 1357 | if (!progress) retry_count--; |
| 1358 | } |
| 1359 | return ret; |
| 1360 | } |
| 1361 | |
| 1362 | int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg, |
| 1363 | unsigned long long val) |
| 1364 | { |
| 1365 | int retry_count = MEM_CGROUP_RECLAIM_RETRIES; |
| 1366 | u64 memlimit, oldusage, curusage; |
| 1367 | int ret; |
| 1368 | |
| 1369 | if (!do_swap_account) |
| 1370 | return -EINVAL; |
| 1371 | |
| 1372 | while (retry_count) { |
| 1373 | if (signal_pending(current)) { |
| 1374 | ret = -EINTR; |
| 1375 | break; |
| 1376 | } |
| 1377 | /* |
| 1378 | * Rather than hide all in some function, I do this in |
| 1379 | * open coded manner. You see what this really does. |
| 1380 | * We have to guarantee mem->res.limit < mem->memsw.limit. |
| 1381 | */ |
| 1382 | mutex_lock(&set_limit_mutex); |
| 1383 | memlimit = res_counter_read_u64(&memcg->res, RES_LIMIT); |
| 1384 | if (memlimit > val) { |
| 1385 | ret = -EINVAL; |
| 1386 | mutex_unlock(&set_limit_mutex); |
| 1387 | break; |
| 1388 | } |
| 1389 | ret = res_counter_set_limit(&memcg->memsw, val); |
| 1390 | mutex_unlock(&set_limit_mutex); |
| 1391 | |
| 1392 | if (!ret) |
| 1393 | break; |
| 1394 | |
| 1395 | oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
| 1396 | try_to_free_mem_cgroup_pages(memcg, GFP_HIGHUSER_MOVABLE, true); |
| 1397 | curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE); |
| 1398 | if (curusage >= oldusage) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1399 | retry_count--; |
| 1400 | } |
| 1401 | return ret; |
| 1402 | } |
| 1403 | |
KAMEZAWA Hiroyuki | c9b0ed5 | 2008-07-25 01:47:15 -0700 | [diff] [blame] | 1404 | /* |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1405 | * This routine traverse page_cgroup in given list and drop them all. |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1406 | * *And* this routine doesn't reclaim page itself, just removes page_cgroup. |
| 1407 | */ |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1408 | static int mem_cgroup_force_empty_list(struct mem_cgroup *mem, |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1409 | int node, int zid, enum lru_list lru) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1410 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1411 | struct zone *zone; |
| 1412 | struct mem_cgroup_per_zone *mz; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1413 | struct page_cgroup *pc, *busy; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1414 | unsigned long flags, loop; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 1415 | struct list_head *list; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1416 | int ret = 0; |
KAMEZAWA Hiroyuki | 072c56c1 | 2008-02-07 00:14:39 -0800 | [diff] [blame] | 1417 | |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1418 | zone = &NODE_DATA(node)->node_zones[zid]; |
| 1419 | mz = mem_cgroup_zoneinfo(mem, node, zid); |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 1420 | list = &mz->lists[lru]; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1421 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1422 | loop = MEM_CGROUP_ZSTAT(mz, lru); |
| 1423 | /* give some margin against EBUSY etc...*/ |
| 1424 | loop += 256; |
| 1425 | busy = NULL; |
| 1426 | while (loop--) { |
| 1427 | ret = 0; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1428 | spin_lock_irqsave(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1429 | if (list_empty(list)) { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1430 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1431 | break; |
| 1432 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1433 | pc = list_entry(list->prev, struct page_cgroup, lru); |
| 1434 | if (busy == pc) { |
| 1435 | list_move(&pc->lru, list); |
| 1436 | busy = 0; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1437 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1438 | continue; |
| 1439 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1440 | spin_unlock_irqrestore(&zone->lru_lock, flags); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1441 | |
| 1442 | ret = mem_cgroup_move_parent(pc, mem, GFP_HIGHUSER_MOVABLE); |
| 1443 | if (ret == -ENOMEM) |
| 1444 | break; |
| 1445 | |
| 1446 | if (ret == -EBUSY || ret == -EINVAL) { |
| 1447 | /* found lock contention or "pc" is obsolete. */ |
| 1448 | busy = pc; |
| 1449 | cond_resched(); |
| 1450 | } else |
| 1451 | busy = NULL; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1452 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1453 | |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1454 | if (!ret && !list_empty(list)) |
| 1455 | return -EBUSY; |
| 1456 | return ret; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1457 | } |
| 1458 | |
| 1459 | /* |
| 1460 | * make mem_cgroup's charge to be 0 if there is no task. |
| 1461 | * This enables deleting this mem_cgroup. |
| 1462 | */ |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1463 | 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] | 1464 | { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1465 | int ret; |
| 1466 | int node, zid, shrink; |
| 1467 | int nr_retries = MEM_CGROUP_RECLAIM_RETRIES; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1468 | struct cgroup *cgrp = mem->css.cgroup; |
Hugh Dickins | 8869b8f | 2008-03-04 14:29:09 -0800 | [diff] [blame] | 1469 | |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1470 | css_get(&mem->css); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1471 | |
| 1472 | shrink = 0; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1473 | /* should free all ? */ |
| 1474 | if (free_all) |
| 1475 | goto try_to_free; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1476 | move_account: |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1477 | while (mem->res.usage > 0) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1478 | ret = -EBUSY; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1479 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children)) |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1480 | goto out; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1481 | ret = -EINTR; |
| 1482 | if (signal_pending(current)) |
| 1483 | goto out; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1484 | /* This is for making all *used* pages to be on LRU. */ |
| 1485 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1486 | ret = 0; |
| 1487 | for_each_node_state(node, N_POSSIBLE) { |
| 1488 | for (zid = 0; !ret && zid < MAX_NR_ZONES; zid++) { |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 1489 | enum lru_list l; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1490 | for_each_lru(l) { |
| 1491 | ret = mem_cgroup_force_empty_list(mem, |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1492 | node, zid, l); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1493 | if (ret) |
| 1494 | break; |
| 1495 | } |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1496 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1497 | if (ret) |
| 1498 | break; |
| 1499 | } |
| 1500 | /* it seems parent cgroup doesn't have enough mem */ |
| 1501 | if (ret == -ENOMEM) |
| 1502 | goto try_to_free; |
KAMEZAWA Hiroyuki | 52d4b9a | 2008-10-18 20:28:16 -0700 | [diff] [blame] | 1503 | cond_resched(); |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1504 | } |
| 1505 | ret = 0; |
| 1506 | out: |
| 1507 | css_put(&mem->css); |
| 1508 | return ret; |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1509 | |
| 1510 | try_to_free: |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1511 | /* returns EBUSY if there is a task or if we come here twice. */ |
| 1512 | if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children) || shrink) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1513 | ret = -EBUSY; |
| 1514 | goto out; |
| 1515 | } |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1516 | /* we call try-to-free pages for make this cgroup empty */ |
| 1517 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1518 | /* try to free all pages in this cgroup */ |
| 1519 | shrink = 1; |
| 1520 | while (nr_retries && mem->res.usage > 0) { |
| 1521 | int progress; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1522 | |
| 1523 | if (signal_pending(current)) { |
| 1524 | ret = -EINTR; |
| 1525 | goto out; |
| 1526 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1527 | progress = try_to_free_mem_cgroup_pages(mem, |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1528 | GFP_HIGHUSER_MOVABLE, false); |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1529 | if (!progress) { |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1530 | nr_retries--; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1531 | /* maybe some writeback is necessary */ |
| 1532 | congestion_wait(WRITE, HZ/10); |
| 1533 | } |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1534 | |
| 1535 | } |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1536 | lru_add_drain(); |
KAMEZAWA Hiroyuki | f817ed4 | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1537 | /* try move_account...there may be some *locked* pages. */ |
| 1538 | if (mem->res.usage) |
| 1539 | goto move_account; |
| 1540 | ret = 0; |
| 1541 | goto out; |
KAMEZAWA Hiroyuki | cc84758 | 2008-02-07 00:14:16 -0800 | [diff] [blame] | 1542 | } |
| 1543 | |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1544 | int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event) |
| 1545 | { |
| 1546 | return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true); |
| 1547 | } |
| 1548 | |
| 1549 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame^] | 1550 | static u64 mem_cgroup_hierarchy_read(struct cgroup *cont, struct cftype *cft) |
| 1551 | { |
| 1552 | return mem_cgroup_from_cont(cont)->use_hierarchy; |
| 1553 | } |
| 1554 | |
| 1555 | static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft, |
| 1556 | u64 val) |
| 1557 | { |
| 1558 | int retval = 0; |
| 1559 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
| 1560 | struct cgroup *parent = cont->parent; |
| 1561 | struct mem_cgroup *parent_mem = NULL; |
| 1562 | |
| 1563 | if (parent) |
| 1564 | parent_mem = mem_cgroup_from_cont(parent); |
| 1565 | |
| 1566 | cgroup_lock(); |
| 1567 | /* |
| 1568 | * If parent's use_hiearchy is set, we can't make any modifications |
| 1569 | * in the child subtrees. If it is unset, then the change can |
| 1570 | * occur, provided the current cgroup has no children. |
| 1571 | * |
| 1572 | * For the root cgroup, parent_mem is NULL, we allow value to be |
| 1573 | * set if there are no children. |
| 1574 | */ |
| 1575 | if ((!parent_mem || !parent_mem->use_hierarchy) && |
| 1576 | (val == 1 || val == 0)) { |
| 1577 | if (list_empty(&cont->children)) |
| 1578 | mem->use_hierarchy = val; |
| 1579 | else |
| 1580 | retval = -EBUSY; |
| 1581 | } else |
| 1582 | retval = -EINVAL; |
| 1583 | cgroup_unlock(); |
| 1584 | |
| 1585 | return retval; |
| 1586 | } |
| 1587 | |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 1588 | static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1589 | { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1590 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
| 1591 | u64 val = 0; |
| 1592 | int type, name; |
| 1593 | |
| 1594 | type = MEMFILE_TYPE(cft->private); |
| 1595 | name = MEMFILE_ATTR(cft->private); |
| 1596 | switch (type) { |
| 1597 | case _MEM: |
| 1598 | val = res_counter_read_u64(&mem->res, name); |
| 1599 | break; |
| 1600 | case _MEMSWAP: |
| 1601 | if (do_swap_account) |
| 1602 | val = res_counter_read_u64(&mem->memsw, name); |
| 1603 | break; |
| 1604 | default: |
| 1605 | BUG(); |
| 1606 | break; |
| 1607 | } |
| 1608 | return val; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1609 | } |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1610 | /* |
| 1611 | * The user of this function is... |
| 1612 | * RES_LIMIT. |
| 1613 | */ |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 1614 | static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft, |
| 1615 | const char *buffer) |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1616 | { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1617 | struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1618 | int type, name; |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1619 | unsigned long long val; |
| 1620 | int ret; |
| 1621 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1622 | type = MEMFILE_TYPE(cft->private); |
| 1623 | name = MEMFILE_ATTR(cft->private); |
| 1624 | switch (name) { |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1625 | case RES_LIMIT: |
| 1626 | /* This function does all necessary parse...reuse it */ |
| 1627 | ret = res_counter_memparse_write_strategy(buffer, &val); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1628 | if (ret) |
| 1629 | break; |
| 1630 | if (type == _MEM) |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1631 | ret = mem_cgroup_resize_limit(memcg, val); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1632 | else |
| 1633 | ret = mem_cgroup_resize_memsw_limit(memcg, val); |
KAMEZAWA Hiroyuki | 628f423 | 2008-07-25 01:47:20 -0700 | [diff] [blame] | 1634 | break; |
| 1635 | default: |
| 1636 | ret = -EINVAL; /* should be BUG() ? */ |
| 1637 | break; |
| 1638 | } |
| 1639 | return ret; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1640 | } |
| 1641 | |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1642 | static int mem_cgroup_reset(struct cgroup *cont, unsigned int event) |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1643 | { |
| 1644 | struct mem_cgroup *mem; |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1645 | int type, name; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1646 | |
| 1647 | mem = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1648 | type = MEMFILE_TYPE(event); |
| 1649 | name = MEMFILE_ATTR(event); |
| 1650 | switch (name) { |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1651 | case RES_MAX_USAGE: |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1652 | if (type == _MEM) |
| 1653 | res_counter_reset_max(&mem->res); |
| 1654 | else |
| 1655 | res_counter_reset_max(&mem->memsw); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1656 | break; |
| 1657 | case RES_FAILCNT: |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1658 | if (type == _MEM) |
| 1659 | res_counter_reset_failcnt(&mem->res); |
| 1660 | else |
| 1661 | res_counter_reset_failcnt(&mem->memsw); |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1662 | break; |
| 1663 | } |
Pavel Emelyanov | 85cc59d | 2008-04-29 01:00:20 -0700 | [diff] [blame] | 1664 | return 0; |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1665 | } |
| 1666 | |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1667 | static const struct mem_cgroup_stat_desc { |
| 1668 | const char *msg; |
| 1669 | u64 unit; |
| 1670 | } mem_cgroup_stat_desc[] = { |
| 1671 | [MEM_CGROUP_STAT_CACHE] = { "cache", PAGE_SIZE, }, |
| 1672 | [MEM_CGROUP_STAT_RSS] = { "rss", PAGE_SIZE, }, |
Balaji Rao | 55e462b | 2008-05-01 04:35:12 -0700 | [diff] [blame] | 1673 | [MEM_CGROUP_STAT_PGPGIN_COUNT] = {"pgpgin", 1, }, |
| 1674 | [MEM_CGROUP_STAT_PGPGOUT_COUNT] = {"pgpgout", 1, }, |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1675 | }; |
| 1676 | |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 1677 | static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft, |
| 1678 | struct cgroup_map_cb *cb) |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1679 | { |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1680 | struct mem_cgroup *mem_cont = mem_cgroup_from_cont(cont); |
| 1681 | struct mem_cgroup_stat *stat = &mem_cont->stat; |
| 1682 | int i; |
| 1683 | |
| 1684 | for (i = 0; i < ARRAY_SIZE(stat->cpustat[0].count); i++) { |
| 1685 | s64 val; |
| 1686 | |
| 1687 | val = mem_cgroup_read_stat(stat, i); |
| 1688 | val *= mem_cgroup_stat_desc[i].unit; |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 1689 | cb->fill(cb, mem_cgroup_stat_desc[i].msg, val); |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1690 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1691 | /* showing # of active pages */ |
| 1692 | { |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1693 | unsigned long active_anon, inactive_anon; |
| 1694 | unsigned long active_file, inactive_file; |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 1695 | unsigned long unevictable; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1696 | |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1697 | inactive_anon = mem_cgroup_get_all_zonestat(mem_cont, |
| 1698 | LRU_INACTIVE_ANON); |
| 1699 | active_anon = mem_cgroup_get_all_zonestat(mem_cont, |
| 1700 | LRU_ACTIVE_ANON); |
| 1701 | inactive_file = mem_cgroup_get_all_zonestat(mem_cont, |
| 1702 | LRU_INACTIVE_FILE); |
| 1703 | active_file = mem_cgroup_get_all_zonestat(mem_cont, |
| 1704 | LRU_ACTIVE_FILE); |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 1705 | unevictable = mem_cgroup_get_all_zonestat(mem_cont, |
| 1706 | LRU_UNEVICTABLE); |
| 1707 | |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1708 | cb->fill(cb, "active_anon", (active_anon) * PAGE_SIZE); |
| 1709 | cb->fill(cb, "inactive_anon", (inactive_anon) * PAGE_SIZE); |
| 1710 | cb->fill(cb, "active_file", (active_file) * PAGE_SIZE); |
| 1711 | cb->fill(cb, "inactive_file", (inactive_file) * PAGE_SIZE); |
Lee Schermerhorn | 7b85412 | 2008-10-18 20:26:40 -0700 | [diff] [blame] | 1712 | cb->fill(cb, "unevictable", unevictable * PAGE_SIZE); |
| 1713 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1714 | } |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1715 | return 0; |
| 1716 | } |
| 1717 | |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1718 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1719 | static struct cftype mem_cgroup_files[] = { |
| 1720 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 1721 | .name = "usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1722 | .private = MEMFILE_PRIVATE(_MEM, RES_USAGE), |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 1723 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1724 | }, |
| 1725 | { |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1726 | .name = "max_usage_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1727 | .private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE), |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1728 | .trigger = mem_cgroup_reset, |
Pavel Emelyanov | c84872e | 2008-04-29 01:00:17 -0700 | [diff] [blame] | 1729 | .read_u64 = mem_cgroup_read, |
| 1730 | }, |
| 1731 | { |
Balbir Singh | 0eea103 | 2008-02-07 00:13:57 -0800 | [diff] [blame] | 1732 | .name = "limit_in_bytes", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1733 | .private = MEMFILE_PRIVATE(_MEM, RES_LIMIT), |
Paul Menage | 856c13a | 2008-07-25 01:47:04 -0700 | [diff] [blame] | 1734 | .write_string = mem_cgroup_write, |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 1735 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1736 | }, |
| 1737 | { |
| 1738 | .name = "failcnt", |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1739 | .private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT), |
Pavel Emelyanov | 29f2a4d | 2008-04-29 01:00:21 -0700 | [diff] [blame] | 1740 | .trigger = mem_cgroup_reset, |
Paul Menage | 2c3daa7 | 2008-04-29 00:59:58 -0700 | [diff] [blame] | 1741 | .read_u64 = mem_cgroup_read, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1742 | }, |
Balbir Singh | 8697d33 | 2008-02-07 00:13:59 -0800 | [diff] [blame] | 1743 | { |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1744 | .name = "stat", |
Paul Menage | c64745c | 2008-04-29 01:00:02 -0700 | [diff] [blame] | 1745 | .read_map = mem_control_stat_show, |
KAMEZAWA Hiroyuki | d2ceb9b | 2008-02-07 00:14:25 -0800 | [diff] [blame] | 1746 | }, |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1747 | { |
| 1748 | .name = "force_empty", |
| 1749 | .trigger = mem_cgroup_force_empty_write, |
| 1750 | }, |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame^] | 1751 | { |
| 1752 | .name = "use_hierarchy", |
| 1753 | .write_u64 = mem_cgroup_hierarchy_write, |
| 1754 | .read_u64 = mem_cgroup_hierarchy_read, |
| 1755 | }, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1756 | }; |
| 1757 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1758 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 1759 | static struct cftype memsw_cgroup_files[] = { |
| 1760 | { |
| 1761 | .name = "memsw.usage_in_bytes", |
| 1762 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE), |
| 1763 | .read_u64 = mem_cgroup_read, |
| 1764 | }, |
| 1765 | { |
| 1766 | .name = "memsw.max_usage_in_bytes", |
| 1767 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE), |
| 1768 | .trigger = mem_cgroup_reset, |
| 1769 | .read_u64 = mem_cgroup_read, |
| 1770 | }, |
| 1771 | { |
| 1772 | .name = "memsw.limit_in_bytes", |
| 1773 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT), |
| 1774 | .write_string = mem_cgroup_write, |
| 1775 | .read_u64 = mem_cgroup_read, |
| 1776 | }, |
| 1777 | { |
| 1778 | .name = "memsw.failcnt", |
| 1779 | .private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT), |
| 1780 | .trigger = mem_cgroup_reset, |
| 1781 | .read_u64 = mem_cgroup_read, |
| 1782 | }, |
| 1783 | }; |
| 1784 | |
| 1785 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) |
| 1786 | { |
| 1787 | if (!do_swap_account) |
| 1788 | return 0; |
| 1789 | return cgroup_add_files(cont, ss, memsw_cgroup_files, |
| 1790 | ARRAY_SIZE(memsw_cgroup_files)); |
| 1791 | }; |
| 1792 | #else |
| 1793 | static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss) |
| 1794 | { |
| 1795 | return 0; |
| 1796 | } |
| 1797 | #endif |
| 1798 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1799 | static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
| 1800 | { |
| 1801 | struct mem_cgroup_per_node *pn; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1802 | struct mem_cgroup_per_zone *mz; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 1803 | enum lru_list l; |
KAMEZAWA Hiroyuki | 41e3355 | 2008-04-08 17:41:54 -0700 | [diff] [blame] | 1804 | int zone, tmp = node; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1805 | /* |
| 1806 | * This routine is called against possible nodes. |
| 1807 | * But it's BUG to call kmalloc() against offline node. |
| 1808 | * |
| 1809 | * TODO: this routine can waste much memory for nodes which will |
| 1810 | * never be onlined. It's better to use memory hotplug callback |
| 1811 | * function. |
| 1812 | */ |
KAMEZAWA Hiroyuki | 41e3355 | 2008-04-08 17:41:54 -0700 | [diff] [blame] | 1813 | if (!node_state(node, N_NORMAL_MEMORY)) |
| 1814 | tmp = -1; |
| 1815 | pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, tmp); |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1816 | if (!pn) |
| 1817 | return 1; |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1818 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1819 | mem->info.nodeinfo[node] = pn; |
| 1820 | memset(pn, 0, sizeof(*pn)); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1821 | |
| 1822 | for (zone = 0; zone < MAX_NR_ZONES; zone++) { |
| 1823 | mz = &pn->zoneinfo[zone]; |
Christoph Lameter | b69408e | 2008-10-18 20:26:14 -0700 | [diff] [blame] | 1824 | for_each_lru(l) |
| 1825 | INIT_LIST_HEAD(&mz->lists[l]); |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1826 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1827 | return 0; |
| 1828 | } |
| 1829 | |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1830 | static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) |
| 1831 | { |
| 1832 | kfree(mem->info.nodeinfo[node]); |
| 1833 | } |
| 1834 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1835 | static int mem_cgroup_size(void) |
| 1836 | { |
| 1837 | int cpustat_size = nr_cpu_ids * sizeof(struct mem_cgroup_stat_cpu); |
| 1838 | return sizeof(struct mem_cgroup) + cpustat_size; |
| 1839 | } |
| 1840 | |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 1841 | static struct mem_cgroup *mem_cgroup_alloc(void) |
| 1842 | { |
| 1843 | struct mem_cgroup *mem; |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1844 | int size = mem_cgroup_size(); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 1845 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1846 | if (size < PAGE_SIZE) |
| 1847 | mem = kmalloc(size, GFP_KERNEL); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 1848 | else |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1849 | mem = vmalloc(size); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 1850 | |
| 1851 | if (mem) |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1852 | memset(mem, 0, size); |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 1853 | return mem; |
| 1854 | } |
| 1855 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1856 | /* |
| 1857 | * At destroying mem_cgroup, references from swap_cgroup can remain. |
| 1858 | * (scanning all at force_empty is too costly...) |
| 1859 | * |
| 1860 | * Instead of clearing all references at force_empty, we remember |
| 1861 | * the number of reference from swap_cgroup and free mem_cgroup when |
| 1862 | * it goes down to 0. |
| 1863 | * |
| 1864 | * When mem_cgroup is destroyed, mem->obsolete will be set to 0 and |
| 1865 | * entry which points to this memcg will be ignore at swapin. |
| 1866 | * |
| 1867 | * Removal of cgroup itself succeeds regardless of refs from swap. |
| 1868 | */ |
| 1869 | |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 1870 | static void mem_cgroup_free(struct mem_cgroup *mem) |
| 1871 | { |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1872 | int node; |
| 1873 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1874 | if (atomic_read(&mem->refcnt) > 0) |
| 1875 | return; |
KAMEZAWA Hiroyuki | 08e552c | 2009-01-07 18:08:01 -0800 | [diff] [blame] | 1876 | |
| 1877 | |
| 1878 | for_each_node_state(node, N_POSSIBLE) |
| 1879 | free_mem_cgroup_per_zone_info(mem, node); |
| 1880 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1881 | if (mem_cgroup_size() < PAGE_SIZE) |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 1882 | kfree(mem); |
| 1883 | else |
| 1884 | vfree(mem); |
| 1885 | } |
| 1886 | |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1887 | static void mem_cgroup_get(struct mem_cgroup *mem) |
| 1888 | { |
| 1889 | atomic_inc(&mem->refcnt); |
| 1890 | } |
| 1891 | |
| 1892 | static void mem_cgroup_put(struct mem_cgroup *mem) |
| 1893 | { |
| 1894 | if (atomic_dec_and_test(&mem->refcnt)) { |
| 1895 | if (!mem->obsolete) |
| 1896 | return; |
| 1897 | mem_cgroup_free(mem); |
| 1898 | } |
| 1899 | } |
| 1900 | |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 1901 | |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 1902 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 1903 | static void __init enable_swap_cgroup(void) |
| 1904 | { |
Hirokazu Takahashi | f8d66542 | 2009-01-07 18:08:02 -0800 | [diff] [blame] | 1905 | if (!mem_cgroup_disabled() && really_do_swap_account) |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 1906 | do_swap_account = 1; |
| 1907 | } |
| 1908 | #else |
| 1909 | static void __init enable_swap_cgroup(void) |
| 1910 | { |
| 1911 | } |
| 1912 | #endif |
| 1913 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1914 | static struct cgroup_subsys_state * |
| 1915 | mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) |
| 1916 | { |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 1917 | struct mem_cgroup *mem, *parent; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1918 | int node; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1919 | |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1920 | mem = mem_cgroup_alloc(); |
| 1921 | if (!mem) |
| 1922 | return ERR_PTR(-ENOMEM); |
Pavel Emelianov | 78fb746 | 2008-02-07 00:13:51 -0800 | [diff] [blame] | 1923 | |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1924 | for_each_node_state(node, N_POSSIBLE) |
| 1925 | if (alloc_mem_cgroup_per_zone_info(mem, node)) |
| 1926 | goto free_out; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 1927 | /* root ? */ |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 1928 | if (cont->parent == NULL) { |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 1929 | enable_swap_cgroup(); |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 1930 | parent = NULL; |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame^] | 1931 | } else { |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 1932 | parent = mem_cgroup_from_cont(cont->parent); |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame^] | 1933 | mem->use_hierarchy = parent->use_hierarchy; |
| 1934 | } |
Balbir Singh | 28dbc4b | 2009-01-07 18:08:05 -0800 | [diff] [blame] | 1935 | |
Balbir Singh | 18f59ea | 2009-01-07 18:08:07 -0800 | [diff] [blame^] | 1936 | if (parent && parent->use_hierarchy) { |
| 1937 | res_counter_init(&mem->res, &parent->res); |
| 1938 | res_counter_init(&mem->memsw, &parent->memsw); |
| 1939 | } else { |
| 1940 | res_counter_init(&mem->res, NULL); |
| 1941 | res_counter_init(&mem->memsw, NULL); |
| 1942 | } |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1943 | |
Balbir Singh | 6d61ef4 | 2009-01-07 18:08:06 -0800 | [diff] [blame] | 1944 | mem->last_scanned_child = NULL; |
| 1945 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1946 | return &mem->css; |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 1947 | free_out: |
| 1948 | for_each_node_state(node, N_POSSIBLE) |
KAMEZAWA Hiroyuki | 1ecaab2 | 2008-02-07 00:14:38 -0800 | [diff] [blame] | 1949 | free_mem_cgroup_per_zone_info(mem, node); |
Jan Blunck | c8dad2b | 2009-01-07 18:07:53 -0800 | [diff] [blame] | 1950 | mem_cgroup_free(mem); |
Li Zefan | 2dda81c | 2008-02-23 15:24:14 -0800 | [diff] [blame] | 1951 | return ERR_PTR(-ENOMEM); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1952 | } |
| 1953 | |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 1954 | static void mem_cgroup_pre_destroy(struct cgroup_subsys *ss, |
| 1955 | struct cgroup *cont) |
| 1956 | { |
| 1957 | struct mem_cgroup *mem = mem_cgroup_from_cont(cont); |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1958 | mem->obsolete = 1; |
KAMEZAWA Hiroyuki | c1e862c | 2009-01-07 18:07:55 -0800 | [diff] [blame] | 1959 | mem_cgroup_force_empty(mem, false); |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 1960 | } |
| 1961 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1962 | static void mem_cgroup_destroy(struct cgroup_subsys *ss, |
| 1963 | struct cgroup *cont) |
| 1964 | { |
KAMEZAWA Hiroyuki | 3332794 | 2008-04-29 01:00:24 -0700 | [diff] [blame] | 1965 | mem_cgroup_free(mem_cgroup_from_cont(cont)); |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1966 | } |
| 1967 | |
| 1968 | static int mem_cgroup_populate(struct cgroup_subsys *ss, |
| 1969 | struct cgroup *cont) |
| 1970 | { |
KAMEZAWA Hiroyuki | 8c7c6e34 | 2009-01-07 18:08:00 -0800 | [diff] [blame] | 1971 | int ret; |
| 1972 | |
| 1973 | ret = cgroup_add_files(cont, ss, mem_cgroup_files, |
| 1974 | ARRAY_SIZE(mem_cgroup_files)); |
| 1975 | |
| 1976 | if (!ret) |
| 1977 | ret = register_memsw_files(cont, ss); |
| 1978 | return ret; |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 1979 | } |
| 1980 | |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 1981 | static void mem_cgroup_move_task(struct cgroup_subsys *ss, |
| 1982 | struct cgroup *cont, |
| 1983 | struct cgroup *old_cont, |
| 1984 | struct task_struct *p) |
| 1985 | { |
| 1986 | struct mm_struct *mm; |
| 1987 | struct mem_cgroup *mem, *old_mem; |
| 1988 | |
| 1989 | mm = get_task_mm(p); |
| 1990 | if (mm == NULL) |
| 1991 | return; |
| 1992 | |
| 1993 | mem = mem_cgroup_from_cont(cont); |
| 1994 | old_mem = mem_cgroup_from_cont(old_cont); |
| 1995 | |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 1996 | /* |
| 1997 | * Only thread group leaders are allowed to migrate, the mm_struct is |
| 1998 | * in effect owned by the leader |
| 1999 | */ |
Pavel Emelyanov | 52ea27e | 2008-03-19 17:00:45 -0700 | [diff] [blame] | 2000 | if (!thread_group_leader(p)) |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 2001 | goto out; |
| 2002 | |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 2003 | out: |
| 2004 | mmput(mm); |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 2005 | } |
| 2006 | |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2007 | struct cgroup_subsys mem_cgroup_subsys = { |
| 2008 | .name = "memory", |
| 2009 | .subsys_id = mem_cgroup_subsys_id, |
| 2010 | .create = mem_cgroup_create, |
KAMEZAWA Hiroyuki | df878fb | 2008-02-07 00:14:28 -0800 | [diff] [blame] | 2011 | .pre_destroy = mem_cgroup_pre_destroy, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2012 | .destroy = mem_cgroup_destroy, |
| 2013 | .populate = mem_cgroup_populate, |
Balbir Singh | 67e465a | 2008-02-07 00:13:54 -0800 | [diff] [blame] | 2014 | .attach = mem_cgroup_move_task, |
KAMEZAWA Hiroyuki | 6d12e2d | 2008-02-07 00:14:31 -0800 | [diff] [blame] | 2015 | .early_init = 0, |
Balbir Singh | 8cdea7c | 2008-02-07 00:13:50 -0800 | [diff] [blame] | 2016 | }; |
KAMEZAWA Hiroyuki | c077719 | 2009-01-07 18:07:57 -0800 | [diff] [blame] | 2017 | |
| 2018 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
| 2019 | |
| 2020 | static int __init disable_swap_account(char *s) |
| 2021 | { |
| 2022 | really_do_swap_account = 0; |
| 2023 | return 1; |
| 2024 | } |
| 2025 | __setup("noswapaccount", disable_swap_account); |
| 2026 | #endif |