Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 1 | /* drivers/misc/lowmemorykiller.c |
| 2 | * |
| 3 | * The lowmemorykiller driver lets user-space specify a set of memory thresholds |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 4 | * where processes with a range of oom_score_adj values will get killed. Specify |
| 5 | * the minimum oom_score_adj values in |
| 6 | * /sys/module/lowmemorykiller/parameters/adj and the number of free pages in |
| 7 | * /sys/module/lowmemorykiller/parameters/minfree. Both files take a comma |
| 8 | * separated list of numbers in ascending order. |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 9 | * |
| 10 | * For example, write "0,8" to /sys/module/lowmemorykiller/parameters/adj and |
Marco Navarra | 3bf5d65 | 2011-12-22 13:28:23 +0100 | [diff] [blame] | 11 | * "1024,4096" to /sys/module/lowmemorykiller/parameters/minfree to kill |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 12 | * processes with a oom_score_adj value of 8 or higher when the free memory |
| 13 | * drops below 4096 pages and kill processes with a oom_score_adj value of 0 or |
| 14 | * higher when the free memory drops below 1024 pages. |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 15 | * |
| 16 | * The driver considers memory used for caches to be free, but if a large |
| 17 | * percentage of the cached memory is locked this can be very inaccurate |
| 18 | * and processes may not get killed until the normal oom killer is triggered. |
| 19 | * |
| 20 | * Copyright (C) 2007-2008 Google, Inc. |
| 21 | * |
| 22 | * This software is licensed under the terms of the GNU General Public |
| 23 | * License version 2, as published by the Free Software Foundation, and |
| 24 | * may be copied, distributed, and modified under those terms. |
| 25 | * |
| 26 | * This program is distributed in the hope that it will be useful, |
| 27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 29 | * GNU General Public License for more details. |
| 30 | * |
| 31 | */ |
| 32 | |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 33 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 34 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 35 | #include <linux/module.h> |
| 36 | #include <linux/kernel.h> |
| 37 | #include <linux/mm.h> |
| 38 | #include <linux/oom.h> |
| 39 | #include <linux/sched.h> |
Arve Hjønnevåg | 231e29f | 2012-09-26 18:01:17 -0700 | [diff] [blame] | 40 | #include <linux/swap.h> |
Anton Vorontsov | 294b271 | 2012-02-06 20:29:41 +0400 | [diff] [blame] | 41 | #include <linux/rcupdate.h> |
San Mehat | 4755b72 | 2010-05-05 11:38:42 -0700 | [diff] [blame] | 42 | #include <linux/notifier.h> |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 43 | #include <linux/mutex.h> |
| 44 | #include <linux/delay.h> |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 45 | #include <linux/swap.h> |
Liam Mark | 04c5d59 | 2013-08-30 12:10:39 -0700 | [diff] [blame] | 46 | #include <linux/fs.h> |
Steve Kondik | f94910d | 2016-04-14 02:52:21 -0700 | [diff] [blame] | 47 | #include <linux/zcache.h> |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 48 | |
| 49 | #ifdef CONFIG_HIGHMEM |
| 50 | #define _ZONE ZONE_HIGHMEM |
| 51 | #else |
| 52 | #define _ZONE ZONE_NORMAL |
| 53 | #endif |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 54 | |
Liam Mark | 2e186ce | 2013-01-21 09:28:14 -0800 | [diff] [blame] | 55 | static uint32_t lowmem_debug_level = 1; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 56 | static int lowmem_adj[6] = { |
| 57 | 0, |
| 58 | 1, |
| 59 | 6, |
| 60 | 12, |
| 61 | }; |
| 62 | static int lowmem_adj_size = 4; |
Greg Kroah-Hartman | 624b225 | 2012-03-07 13:21:23 -0800 | [diff] [blame] | 63 | static int lowmem_minfree[6] = { |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 64 | 3 * 512, /* 6MB */ |
| 65 | 2 * 1024, /* 8MB */ |
| 66 | 4 * 1024, /* 16MB */ |
| 67 | 16 * 1024, /* 64MB */ |
| 68 | }; |
| 69 | static int lowmem_minfree_size = 4; |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 70 | static int lmk_fast_run = 1; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 71 | |
Arve Hjønnevåg | e5d7965 | 2012-01-13 22:21:25 +0400 | [diff] [blame] | 72 | static unsigned long lowmem_deathpending_timeout; |
San Mehat | 4755b72 | 2010-05-05 11:38:42 -0700 | [diff] [blame] | 73 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 74 | #define lowmem_print(level, x...) \ |
| 75 | do { \ |
| 76 | if (lowmem_debug_level >= (level)) \ |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 77 | pr_info(x); \ |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 78 | } while (0) |
| 79 | |
Liam Mark | dabca8d | 2012-09-20 14:42:28 -0700 | [diff] [blame] | 80 | static int test_task_flag(struct task_struct *p, int flag) |
| 81 | { |
| 82 | struct task_struct *t = p; |
| 83 | |
| 84 | do { |
| 85 | task_lock(t); |
| 86 | if (test_tsk_thread_flag(t, flag)) { |
| 87 | task_unlock(t); |
| 88 | return 1; |
| 89 | } |
| 90 | task_unlock(t); |
| 91 | } while_each_thread(p, t); |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 96 | static DEFINE_MUTEX(scan_mutex); |
| 97 | |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 98 | int can_use_cma_pages(gfp_t gfp_mask) |
| 99 | { |
| 100 | int can_use = 0; |
| 101 | int mtype = allocflags_to_migratetype(gfp_mask); |
| 102 | int i = 0; |
| 103 | int *mtype_fallbacks = get_migratetype_fallbacks(mtype); |
| 104 | |
| 105 | if (is_migrate_cma(mtype)) { |
| 106 | can_use = 1; |
| 107 | } else { |
| 108 | for (i = 0;; i++) { |
| 109 | int fallbacktype = mtype_fallbacks[i]; |
| 110 | |
| 111 | if (is_migrate_cma(fallbacktype)) { |
| 112 | can_use = 1; |
| 113 | break; |
| 114 | } |
| 115 | |
| 116 | if (fallbacktype == MIGRATE_RESERVE) |
| 117 | break; |
| 118 | } |
| 119 | } |
| 120 | return can_use; |
| 121 | } |
| 122 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 123 | void tune_lmk_zone_param(struct zonelist *zonelist, int classzone_idx, |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 124 | int *other_free, int *other_file, |
| 125 | int use_cma_pages) |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 126 | { |
| 127 | struct zone *zone; |
| 128 | struct zoneref *zoneref; |
| 129 | int zone_idx; |
| 130 | |
| 131 | for_each_zone_zonelist(zone, zoneref, zonelist, MAX_NR_ZONES) { |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 132 | zone_idx = zonelist_zone_idx(zoneref); |
| 133 | if (zone_idx == ZONE_MOVABLE) { |
| 134 | if (!use_cma_pages) |
| 135 | *other_free -= |
| 136 | zone_page_state(zone, NR_FREE_CMA_PAGES); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 137 | continue; |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 138 | } |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 139 | |
| 140 | if (zone_idx > classzone_idx) { |
| 141 | if (other_free != NULL) |
| 142 | *other_free -= zone_page_state(zone, |
| 143 | NR_FREE_PAGES); |
| 144 | if (other_file != NULL) |
| 145 | *other_file -= zone_page_state(zone, |
| 146 | NR_FILE_PAGES) |
| 147 | - zone_page_state(zone, NR_SHMEM); |
| 148 | } else if (zone_idx < classzone_idx) { |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 149 | if (zone_watermark_ok(zone, 0, 0, classzone_idx, 0)) { |
| 150 | if (!use_cma_pages) { |
| 151 | *other_free -= min( |
| 152 | zone->lowmem_reserve[classzone_idx] + |
| 153 | zone_page_state( |
| 154 | zone, NR_FREE_CMA_PAGES), |
| 155 | zone_page_state( |
| 156 | zone, NR_FREE_PAGES)); |
| 157 | } else { |
| 158 | *other_free -= |
| 159 | zone->lowmem_reserve[classzone_idx]; |
| 160 | } |
| 161 | } else { |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 162 | *other_free -= |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 163 | zone_page_state(zone, NR_FREE_PAGES); |
| 164 | } |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 165 | } |
| 166 | } |
| 167 | } |
| 168 | |
Liam Mark | 20cba1b | 2014-03-10 16:06:39 -0700 | [diff] [blame^] | 169 | #ifdef CONFIG_HIGHMEM |
| 170 | void adjust_gfp_mask(gfp_t *gfp_mask) |
| 171 | { |
| 172 | struct zone *preferred_zone; |
| 173 | struct zonelist *zonelist; |
| 174 | enum zone_type high_zoneidx; |
| 175 | |
| 176 | if (current_is_kswapd()) { |
| 177 | zonelist = node_zonelist(0, *gfp_mask); |
| 178 | high_zoneidx = gfp_zone(*gfp_mask); |
| 179 | first_zones_zonelist(zonelist, high_zoneidx, NULL, |
| 180 | &preferred_zone); |
| 181 | |
| 182 | if (high_zoneidx == ZONE_NORMAL) { |
| 183 | if (zone_watermark_ok_safe(preferred_zone, 0, |
| 184 | high_wmark_pages(preferred_zone), 0, |
| 185 | 0)) |
| 186 | *gfp_mask |= __GFP_HIGHMEM; |
| 187 | } else if (high_zoneidx == ZONE_HIGHMEM) { |
| 188 | *gfp_mask |= __GFP_HIGHMEM; |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | #else |
| 193 | void adjust_gfp_mask(gfp_t *unused) |
| 194 | { |
| 195 | } |
| 196 | #endif |
| 197 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 198 | void tune_lmk_param(int *other_free, int *other_file, struct shrink_control *sc) |
| 199 | { |
| 200 | gfp_t gfp_mask; |
| 201 | struct zone *preferred_zone; |
| 202 | struct zonelist *zonelist; |
| 203 | enum zone_type high_zoneidx, classzone_idx; |
| 204 | unsigned long balance_gap; |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 205 | int use_cma_pages; |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 206 | |
| 207 | gfp_mask = sc->gfp_mask; |
Liam Mark | 20cba1b | 2014-03-10 16:06:39 -0700 | [diff] [blame^] | 208 | adjust_gfp_mask(&gfp_mask); |
| 209 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 210 | zonelist = node_zonelist(0, gfp_mask); |
| 211 | high_zoneidx = gfp_zone(gfp_mask); |
| 212 | first_zones_zonelist(zonelist, high_zoneidx, NULL, &preferred_zone); |
| 213 | classzone_idx = zone_idx(preferred_zone); |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 214 | use_cma_pages = can_use_cma_pages(gfp_mask); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 215 | |
| 216 | balance_gap = min(low_wmark_pages(preferred_zone), |
| 217 | (preferred_zone->present_pages + |
| 218 | KSWAPD_ZONE_BALANCE_GAP_RATIO-1) / |
| 219 | KSWAPD_ZONE_BALANCE_GAP_RATIO); |
| 220 | |
| 221 | if (likely(current_is_kswapd() && zone_watermark_ok(preferred_zone, 0, |
| 222 | high_wmark_pages(preferred_zone) + SWAP_CLUSTER_MAX + |
| 223 | balance_gap, 0, 0))) { |
| 224 | if (lmk_fast_run) |
| 225 | tune_lmk_zone_param(zonelist, classzone_idx, other_free, |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 226 | other_file, use_cma_pages); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 227 | else |
| 228 | tune_lmk_zone_param(zonelist, classzone_idx, other_free, |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 229 | NULL, use_cma_pages); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 230 | |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 231 | if (zone_watermark_ok(preferred_zone, 0, 0, _ZONE, 0)) { |
| 232 | if (!use_cma_pages) { |
| 233 | *other_free -= min( |
| 234 | preferred_zone->lowmem_reserve[_ZONE] |
| 235 | + zone_page_state( |
| 236 | preferred_zone, NR_FREE_CMA_PAGES), |
| 237 | zone_page_state( |
| 238 | preferred_zone, NR_FREE_PAGES)); |
| 239 | } else { |
| 240 | *other_free -= |
| 241 | preferred_zone->lowmem_reserve[_ZONE]; |
| 242 | } |
| 243 | } else { |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 244 | *other_free -= zone_page_state(preferred_zone, |
| 245 | NR_FREE_PAGES); |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 246 | } |
| 247 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 248 | lowmem_print(4, "lowmem_shrink of kswapd tunning for highmem " |
| 249 | "ofree %d, %d\n", *other_free, *other_file); |
| 250 | } else { |
| 251 | tune_lmk_zone_param(zonelist, classzone_idx, other_free, |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 252 | other_file, use_cma_pages); |
| 253 | |
| 254 | if (!use_cma_pages) { |
| 255 | *other_free -= |
| 256 | zone_page_state(preferred_zone, NR_FREE_CMA_PAGES); |
| 257 | } |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 258 | |
| 259 | lowmem_print(4, "lowmem_shrink tunning for others ofree %d, " |
| 260 | "%d\n", *other_free, *other_file); |
| 261 | } |
| 262 | } |
| 263 | |
Colin Cross | cae9bf1 | 2011-06-22 16:05:47 -0700 | [diff] [blame] | 264 | static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc) |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 265 | { |
Anton Vorontsov | 9567000 | 2012-02-06 20:29:47 +0400 | [diff] [blame] | 266 | struct task_struct *tsk; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 267 | struct task_struct *selected = NULL; |
| 268 | int rem = 0; |
| 269 | int tasksize; |
| 270 | int i; |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 271 | int min_score_adj = OOM_SCORE_ADJ_MAX + 1; |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 272 | int minfree = 0; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 273 | int selected_tasksize = 0; |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 274 | int selected_oom_score_adj; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 275 | int array_size = ARRAY_SIZE(lowmem_adj); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 276 | int other_free; |
| 277 | int other_file; |
| 278 | unsigned long nr_to_scan = sc->nr_to_scan; |
| 279 | |
| 280 | if (nr_to_scan > 0) { |
| 281 | if (mutex_lock_interruptible(&scan_mutex) < 0) |
| 282 | return 0; |
| 283 | } |
| 284 | |
Arve Hjønnevåg | 231e29f | 2012-09-26 18:01:17 -0700 | [diff] [blame] | 285 | other_free = global_page_state(NR_FREE_PAGES) - totalreserve_pages; |
Liam Mark | 04c5d59 | 2013-08-30 12:10:39 -0700 | [diff] [blame] | 286 | |
Shaohua Li | 2b89993 | 2013-02-22 16:34:37 -0800 | [diff] [blame] | 287 | if (global_page_state(NR_SHMEM) + total_swapcache_pages() < |
Liam Mark | 04c5d59 | 2013-08-30 12:10:39 -0700 | [diff] [blame] | 288 | global_page_state(NR_FILE_PAGES)) |
Steve Kondik | f94910d | 2016-04-14 02:52:21 -0700 | [diff] [blame] | 289 | other_file = global_page_state(NR_FILE_PAGES) + zcache_pages() - |
Liam Mark | 04c5d59 | 2013-08-30 12:10:39 -0700 | [diff] [blame] | 290 | global_page_state(NR_SHMEM) - |
Shaohua Li | 2b89993 | 2013-02-22 16:34:37 -0800 | [diff] [blame] | 291 | total_swapcache_pages(); |
Liam Mark | 04c5d59 | 2013-08-30 12:10:39 -0700 | [diff] [blame] | 292 | else |
| 293 | other_file = 0; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 294 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 295 | tune_lmk_param(&other_free, &other_file, sc); |
| 296 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 297 | if (lowmem_adj_size < array_size) |
| 298 | array_size = lowmem_adj_size; |
| 299 | if (lowmem_minfree_size < array_size) |
| 300 | array_size = lowmem_minfree_size; |
| 301 | for (i = 0; i < array_size; i++) { |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 302 | minfree = lowmem_minfree[i]; |
| 303 | if (other_free < minfree && other_file < minfree) { |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 304 | min_score_adj = lowmem_adj[i]; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 305 | break; |
| 306 | } |
| 307 | } |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 308 | if (nr_to_scan > 0) |
Colin Cross | cae9bf1 | 2011-06-22 16:05:47 -0700 | [diff] [blame] | 309 | lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %d\n", |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 310 | nr_to_scan, sc->gfp_mask, other_free, |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 311 | other_file, min_score_adj); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 312 | rem = global_page_state(NR_ACTIVE_ANON) + |
| 313 | global_page_state(NR_ACTIVE_FILE) + |
| 314 | global_page_state(NR_INACTIVE_ANON) + |
| 315 | global_page_state(NR_INACTIVE_FILE); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 316 | if (nr_to_scan <= 0 || min_score_adj == OOM_SCORE_ADJ_MAX + 1) { |
Colin Cross | cae9bf1 | 2011-06-22 16:05:47 -0700 | [diff] [blame] | 317 | lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n", |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 318 | nr_to_scan, sc->gfp_mask, rem); |
| 319 | |
| 320 | if (nr_to_scan > 0) |
| 321 | mutex_unlock(&scan_mutex); |
| 322 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 323 | return rem; |
| 324 | } |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 325 | selected_oom_score_adj = min_score_adj; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 326 | |
Anton Vorontsov | 294b271 | 2012-02-06 20:29:41 +0400 | [diff] [blame] | 327 | rcu_read_lock(); |
Anton Vorontsov | 9567000 | 2012-02-06 20:29:47 +0400 | [diff] [blame] | 328 | for_each_process(tsk) { |
| 329 | struct task_struct *p; |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 330 | int oom_score_adj; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 331 | |
Anton Vorontsov | 9823ec9 | 2012-02-06 20:30:01 +0400 | [diff] [blame] | 332 | if (tsk->flags & PF_KTHREAD) |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 333 | continue; |
Anton Vorontsov | 9823ec9 | 2012-02-06 20:30:01 +0400 | [diff] [blame] | 334 | |
Liam Mark | 3b23c188 | 2013-02-07 14:31:36 -0800 | [diff] [blame] | 335 | /* if task no longer has any memory ignore it */ |
| 336 | if (test_task_flag(tsk, TIF_MM_RELEASED)) |
| 337 | continue; |
| 338 | |
Liam Mark | dabca8d | 2012-09-20 14:42:28 -0700 | [diff] [blame] | 339 | if (time_before_eq(jiffies, lowmem_deathpending_timeout)) { |
| 340 | if (test_task_flag(tsk, TIF_MEMDIE)) { |
| 341 | rcu_read_unlock(); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 342 | /* give the system time to free up the memory */ |
| 343 | msleep_interruptible(20); |
| 344 | mutex_unlock(&scan_mutex); |
Liam Mark | dabca8d | 2012-09-20 14:42:28 -0700 | [diff] [blame] | 345 | return 0; |
| 346 | } |
| 347 | } |
| 348 | |
Anton Vorontsov | 9567000 | 2012-02-06 20:29:47 +0400 | [diff] [blame] | 349 | p = find_lock_task_mm(tsk); |
| 350 | if (!p) |
| 351 | continue; |
| 352 | |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 353 | oom_score_adj = p->signal->oom_score_adj; |
| 354 | if (oom_score_adj < min_score_adj) { |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 355 | task_unlock(p); |
| 356 | continue; |
| 357 | } |
Anton Vorontsov | 9567000 | 2012-02-06 20:29:47 +0400 | [diff] [blame] | 358 | tasksize = get_mm_rss(p->mm); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 359 | task_unlock(p); |
| 360 | if (tasksize <= 0) |
| 361 | continue; |
| 362 | if (selected) { |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 363 | if (oom_score_adj < selected_oom_score_adj) |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 364 | continue; |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 365 | if (oom_score_adj == selected_oom_score_adj && |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 366 | tasksize <= selected_tasksize) |
| 367 | continue; |
| 368 | } |
| 369 | selected = p; |
| 370 | selected_tasksize = tasksize; |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 371 | selected_oom_score_adj = oom_score_adj; |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 372 | lowmem_print(2, "select '%s' (%d), adj %d, size %d, to kill\n", |
| 373 | p->comm, p->pid, oom_score_adj, tasksize); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 374 | } |
| 375 | if (selected) { |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 376 | lowmem_print(1, "Killing '%s' (%d), adj %d,\n" \ |
| 377 | " to free %ldkB on behalf of '%s' (%d) because\n" \ |
| 378 | " cache %ldkB is below limit %ldkB for oom_score_adj %d\n" \ |
| 379 | " Free memory is %ldkB above reserved\n", |
| 380 | selected->comm, selected->pid, |
| 381 | selected_oom_score_adj, |
| 382 | selected_tasksize * (long)(PAGE_SIZE / 1024), |
| 383 | current->comm, current->pid, |
| 384 | other_file * (long)(PAGE_SIZE / 1024), |
| 385 | minfree * (long)(PAGE_SIZE / 1024), |
| 386 | min_score_adj, |
| 387 | other_free * (long)(PAGE_SIZE / 1024)); |
Arve Hjønnevåg | e5d7965 | 2012-01-13 22:21:25 +0400 | [diff] [blame] | 388 | lowmem_deathpending_timeout = jiffies + HZ; |
Anton Vorontsov | 294b271 | 2012-02-06 20:29:41 +0400 | [diff] [blame] | 389 | send_sig(SIGKILL, selected, 0); |
David Rientjes | 83dbbdb | 2012-04-09 16:56:18 -0700 | [diff] [blame] | 390 | set_tsk_thread_flag(selected, TIF_MEMDIE); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 391 | rem -= selected_tasksize; |
Liam Mark | 3b23c188 | 2013-02-07 14:31:36 -0800 | [diff] [blame] | 392 | rcu_read_unlock(); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 393 | /* give the system time to free up the memory */ |
| 394 | msleep_interruptible(20); |
Liam Mark | 3b23c188 | 2013-02-07 14:31:36 -0800 | [diff] [blame] | 395 | } else |
| 396 | rcu_read_unlock(); |
| 397 | |
Colin Cross | cae9bf1 | 2011-06-22 16:05:47 -0700 | [diff] [blame] | 398 | lowmem_print(4, "lowmem_shrink %lu, %x, return %d\n", |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 399 | nr_to_scan, sc->gfp_mask, rem); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 400 | mutex_unlock(&scan_mutex); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 401 | return rem; |
| 402 | } |
| 403 | |
| 404 | static struct shrinker lowmem_shrinker = { |
| 405 | .shrink = lowmem_shrink, |
| 406 | .seeks = DEFAULT_SEEKS * 16 |
| 407 | }; |
| 408 | |
| 409 | static int __init lowmem_init(void) |
| 410 | { |
| 411 | register_shrinker(&lowmem_shrinker); |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | static void __exit lowmem_exit(void) |
| 416 | { |
| 417 | unregister_shrinker(&lowmem_shrinker); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 418 | } |
| 419 | |
Arve Hjønnevåg | 227b6be | 2012-09-25 17:37:14 -0700 | [diff] [blame] | 420 | #ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES |
| 421 | static int lowmem_oom_adj_to_oom_score_adj(int oom_adj) |
| 422 | { |
| 423 | if (oom_adj == OOM_ADJUST_MAX) |
| 424 | return OOM_SCORE_ADJ_MAX; |
| 425 | else |
| 426 | return (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; |
| 427 | } |
| 428 | |
| 429 | static void lowmem_autodetect_oom_adj_values(void) |
| 430 | { |
| 431 | int i; |
| 432 | int oom_adj; |
| 433 | int oom_score_adj; |
| 434 | int array_size = ARRAY_SIZE(lowmem_adj); |
| 435 | |
| 436 | if (lowmem_adj_size < array_size) |
| 437 | array_size = lowmem_adj_size; |
| 438 | |
| 439 | if (array_size <= 0) |
| 440 | return; |
| 441 | |
| 442 | oom_adj = lowmem_adj[array_size - 1]; |
| 443 | if (oom_adj > OOM_ADJUST_MAX) |
| 444 | return; |
| 445 | |
| 446 | oom_score_adj = lowmem_oom_adj_to_oom_score_adj(oom_adj); |
| 447 | if (oom_score_adj <= OOM_ADJUST_MAX) |
| 448 | return; |
| 449 | |
| 450 | lowmem_print(1, "lowmem_shrink: convert oom_adj to oom_score_adj:\n"); |
| 451 | for (i = 0; i < array_size; i++) { |
| 452 | oom_adj = lowmem_adj[i]; |
| 453 | oom_score_adj = lowmem_oom_adj_to_oom_score_adj(oom_adj); |
| 454 | lowmem_adj[i] = oom_score_adj; |
| 455 | lowmem_print(1, "oom_adj %d => oom_score_adj %d\n", |
| 456 | oom_adj, oom_score_adj); |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | static int lowmem_adj_array_set(const char *val, const struct kernel_param *kp) |
| 461 | { |
| 462 | int ret; |
| 463 | |
| 464 | ret = param_array_ops.set(val, kp); |
| 465 | |
| 466 | /* HACK: Autodetect oom_adj values in lowmem_adj array */ |
| 467 | lowmem_autodetect_oom_adj_values(); |
| 468 | |
| 469 | return ret; |
| 470 | } |
| 471 | |
| 472 | static int lowmem_adj_array_get(char *buffer, const struct kernel_param *kp) |
| 473 | { |
| 474 | return param_array_ops.get(buffer, kp); |
| 475 | } |
| 476 | |
| 477 | static void lowmem_adj_array_free(void *arg) |
| 478 | { |
| 479 | param_array_ops.free(arg); |
| 480 | } |
| 481 | |
| 482 | static struct kernel_param_ops lowmem_adj_array_ops = { |
| 483 | .set = lowmem_adj_array_set, |
| 484 | .get = lowmem_adj_array_get, |
| 485 | .free = lowmem_adj_array_free, |
| 486 | }; |
| 487 | |
| 488 | static const struct kparam_array __param_arr_adj = { |
| 489 | .max = ARRAY_SIZE(lowmem_adj), |
| 490 | .num = &lowmem_adj_size, |
| 491 | .ops = ¶m_ops_int, |
| 492 | .elemsize = sizeof(lowmem_adj[0]), |
| 493 | .elem = lowmem_adj, |
| 494 | }; |
| 495 | #endif |
| 496 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 497 | module_param_named(cost, lowmem_shrinker.seeks, int, S_IRUGO | S_IWUSR); |
Arve Hjønnevåg | 227b6be | 2012-09-25 17:37:14 -0700 | [diff] [blame] | 498 | #ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES |
| 499 | __module_param_call(MODULE_PARAM_PREFIX, adj, |
| 500 | &lowmem_adj_array_ops, |
| 501 | .arr = &__param_arr_adj, |
| 502 | S_IRUGO | S_IWUSR, -1); |
| 503 | __MODULE_PARM_TYPE(adj, "array of int"); |
| 504 | #else |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 505 | module_param_array_named(adj, lowmem_adj, int, &lowmem_adj_size, |
| 506 | S_IRUGO | S_IWUSR); |
Arve Hjønnevåg | 227b6be | 2012-09-25 17:37:14 -0700 | [diff] [blame] | 507 | #endif |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 508 | module_param_array_named(minfree, lowmem_minfree, uint, &lowmem_minfree_size, |
| 509 | S_IRUGO | S_IWUSR); |
| 510 | module_param_named(debug_level, lowmem_debug_level, uint, S_IRUGO | S_IWUSR); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 511 | module_param_named(lmk_fast_run, lmk_fast_run, int, S_IRUGO | S_IWUSR); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 512 | |
| 513 | module_init(lowmem_init); |
| 514 | module_exit(lowmem_exit); |
| 515 | |
| 516 | MODULE_LICENSE("GPL"); |
| 517 | |