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> |
Liam Mark | 398a1b4 | 2014-06-03 13:57:47 -0700 | [diff] [blame] | 47 | #include <linux/cpuset.h> |
Laura Abbott | 3c47bc2 | 2014-09-23 19:31:19 -0700 | [diff] [blame] | 48 | #include <linux/show_mem_notifier.h> |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 49 | #include <linux/vmpressure.h> |
Steve Kondik | f94910d | 2016-04-14 02:52:21 -0700 | [diff] [blame] | 50 | #include <linux/zcache.h> |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 51 | |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 52 | #define CREATE_TRACE_POINTS |
| 53 | #include <trace/events/almk.h> |
| 54 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 55 | #ifdef CONFIG_HIGHMEM |
| 56 | #define _ZONE ZONE_HIGHMEM |
| 57 | #else |
| 58 | #define _ZONE ZONE_NORMAL |
| 59 | #endif |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 60 | |
Liam Mark | 2e186ce | 2013-01-21 09:28:14 -0800 | [diff] [blame] | 61 | static uint32_t lowmem_debug_level = 1; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 62 | static int lowmem_adj[6] = { |
| 63 | 0, |
| 64 | 1, |
| 65 | 6, |
| 66 | 12, |
| 67 | }; |
| 68 | static int lowmem_adj_size = 4; |
Greg Kroah-Hartman | 624b225 | 2012-03-07 13:21:23 -0800 | [diff] [blame] | 69 | static int lowmem_minfree[6] = { |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 70 | 3 * 512, /* 6MB */ |
| 71 | 2 * 1024, /* 8MB */ |
| 72 | 4 * 1024, /* 16MB */ |
| 73 | 16 * 1024, /* 64MB */ |
| 74 | }; |
| 75 | static int lowmem_minfree_size = 4; |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 76 | static int lmk_fast_run = 1; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 77 | |
Arve Hjønnevåg | e5d7965 | 2012-01-13 22:21:25 +0400 | [diff] [blame] | 78 | static unsigned long lowmem_deathpending_timeout; |
San Mehat | 4755b72 | 2010-05-05 11:38:42 -0700 | [diff] [blame] | 79 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 80 | #define lowmem_print(level, x...) \ |
| 81 | do { \ |
| 82 | if (lowmem_debug_level >= (level)) \ |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 83 | pr_info(x); \ |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 84 | } while (0) |
| 85 | |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 86 | static atomic_t shift_adj = ATOMIC_INIT(0); |
| 87 | static short adj_max_shift = 353; |
| 88 | |
| 89 | /* User knob to enable/disable adaptive lmk feature */ |
| 90 | static int enable_adaptive_lmk; |
| 91 | module_param_named(enable_adaptive_lmk, enable_adaptive_lmk, int, |
| 92 | S_IRUGO | S_IWUSR); |
| 93 | |
| 94 | /* |
| 95 | * This parameter controls the behaviour of LMK when vmpressure is in |
| 96 | * the range of 90-94. Adaptive lmk triggers based on number of file |
| 97 | * pages wrt vmpressure_file_min, when vmpressure is in the range of |
| 98 | * 90-94. Usually this is a pseudo minfree value, higher than the |
| 99 | * highest configured value in minfree array. |
| 100 | */ |
| 101 | static int vmpressure_file_min; |
| 102 | module_param_named(vmpressure_file_min, vmpressure_file_min, int, |
| 103 | S_IRUGO | S_IWUSR); |
| 104 | |
| 105 | enum { |
| 106 | VMPRESSURE_NO_ADJUST = 0, |
| 107 | VMPRESSURE_ADJUST_ENCROACH, |
| 108 | VMPRESSURE_ADJUST_NORMAL, |
| 109 | }; |
| 110 | |
| 111 | int adjust_minadj(short *min_score_adj) |
| 112 | { |
| 113 | int ret = VMPRESSURE_NO_ADJUST; |
| 114 | |
| 115 | if (!enable_adaptive_lmk) |
| 116 | return 0; |
| 117 | |
| 118 | if (atomic_read(&shift_adj) && |
| 119 | (*min_score_adj > adj_max_shift)) { |
| 120 | if (*min_score_adj == OOM_SCORE_ADJ_MAX + 1) |
| 121 | ret = VMPRESSURE_ADJUST_ENCROACH; |
| 122 | else |
| 123 | ret = VMPRESSURE_ADJUST_NORMAL; |
| 124 | *min_score_adj = adj_max_shift; |
| 125 | } |
| 126 | atomic_set(&shift_adj, 0); |
| 127 | |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | static int lmk_vmpressure_notifier(struct notifier_block *nb, |
| 132 | unsigned long action, void *data) |
| 133 | { |
Vinayak Menon | cdbb2a6 | 2015-08-19 16:11:04 +0530 | [diff] [blame^] | 134 | int other_free = 0, other_file = 0; |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 135 | unsigned long pressure = action; |
| 136 | int array_size = ARRAY_SIZE(lowmem_adj); |
| 137 | |
| 138 | if (!enable_adaptive_lmk) |
| 139 | return 0; |
| 140 | |
| 141 | if (pressure >= 95) { |
| 142 | other_file = global_page_state(NR_FILE_PAGES) - |
| 143 | global_page_state(NR_SHMEM) - |
| 144 | total_swapcache_pages(); |
| 145 | other_free = global_page_state(NR_FREE_PAGES); |
| 146 | |
| 147 | atomic_set(&shift_adj, 1); |
| 148 | trace_almk_vmpressure(pressure, other_free, other_file); |
| 149 | } else if (pressure >= 90) { |
| 150 | if (lowmem_adj_size < array_size) |
| 151 | array_size = lowmem_adj_size; |
| 152 | if (lowmem_minfree_size < array_size) |
| 153 | array_size = lowmem_minfree_size; |
| 154 | |
| 155 | other_file = global_page_state(NR_FILE_PAGES) - |
| 156 | global_page_state(NR_SHMEM) - |
| 157 | total_swapcache_pages(); |
| 158 | |
| 159 | other_free = global_page_state(NR_FREE_PAGES); |
| 160 | |
| 161 | if ((other_free < lowmem_minfree[array_size - 1]) && |
| 162 | (other_file < vmpressure_file_min)) { |
| 163 | atomic_set(&shift_adj, 1); |
| 164 | trace_almk_vmpressure(pressure, other_free, |
| 165 | other_file); |
| 166 | } |
Vinayak Menon | cdbb2a6 | 2015-08-19 16:11:04 +0530 | [diff] [blame^] | 167 | } else if (atomic_read(&shift_adj)) { |
| 168 | /* |
| 169 | * shift_adj would have been set by a previous invocation |
| 170 | * of notifier, which is not followed by a lowmem_shrink yet. |
| 171 | * Since vmpressure has improved, reset shift_adj to avoid |
| 172 | * false adaptive LMK trigger. |
| 173 | */ |
| 174 | trace_almk_vmpressure(pressure, other_free, other_file); |
| 175 | atomic_set(&shift_adj, 0); |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | static struct notifier_block lmk_vmpr_nb = { |
| 182 | .notifier_call = lmk_vmpressure_notifier, |
| 183 | }; |
| 184 | |
Liam Mark | dabca8d | 2012-09-20 14:42:28 -0700 | [diff] [blame] | 185 | static int test_task_flag(struct task_struct *p, int flag) |
| 186 | { |
Vinayak Menon | 1c837fc | 2015-05-21 20:44:14 +0530 | [diff] [blame] | 187 | struct task_struct *t; |
Liam Mark | dabca8d | 2012-09-20 14:42:28 -0700 | [diff] [blame] | 188 | |
Vinayak Menon | 1c837fc | 2015-05-21 20:44:14 +0530 | [diff] [blame] | 189 | for_each_thread(p, t) { |
Liam Mark | dabca8d | 2012-09-20 14:42:28 -0700 | [diff] [blame] | 190 | task_lock(t); |
| 191 | if (test_tsk_thread_flag(t, flag)) { |
| 192 | task_unlock(t); |
| 193 | return 1; |
| 194 | } |
| 195 | task_unlock(t); |
Vinayak Menon | 1c837fc | 2015-05-21 20:44:14 +0530 | [diff] [blame] | 196 | } |
Liam Mark | dabca8d | 2012-09-20 14:42:28 -0700 | [diff] [blame] | 197 | |
| 198 | return 0; |
| 199 | } |
| 200 | |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 201 | static DEFINE_MUTEX(scan_mutex); |
| 202 | |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 203 | int can_use_cma_pages(gfp_t gfp_mask) |
| 204 | { |
| 205 | int can_use = 0; |
| 206 | int mtype = allocflags_to_migratetype(gfp_mask); |
| 207 | int i = 0; |
| 208 | int *mtype_fallbacks = get_migratetype_fallbacks(mtype); |
| 209 | |
| 210 | if (is_migrate_cma(mtype)) { |
| 211 | can_use = 1; |
| 212 | } else { |
| 213 | for (i = 0;; i++) { |
| 214 | int fallbacktype = mtype_fallbacks[i]; |
| 215 | |
| 216 | if (is_migrate_cma(fallbacktype)) { |
| 217 | can_use = 1; |
| 218 | break; |
| 219 | } |
| 220 | |
| 221 | if (fallbacktype == MIGRATE_RESERVE) |
| 222 | break; |
| 223 | } |
| 224 | } |
| 225 | return can_use; |
| 226 | } |
| 227 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 228 | void tune_lmk_zone_param(struct zonelist *zonelist, int classzone_idx, |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 229 | int *other_free, int *other_file, |
| 230 | int use_cma_pages) |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 231 | { |
| 232 | struct zone *zone; |
| 233 | struct zoneref *zoneref; |
| 234 | int zone_idx; |
| 235 | |
| 236 | for_each_zone_zonelist(zone, zoneref, zonelist, MAX_NR_ZONES) { |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 237 | zone_idx = zonelist_zone_idx(zoneref); |
| 238 | if (zone_idx == ZONE_MOVABLE) { |
Susheel Khiani | 986fcbb | 2015-02-12 19:00:15 +0530 | [diff] [blame] | 239 | if (!use_cma_pages && other_free) |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 240 | *other_free -= |
| 241 | zone_page_state(zone, NR_FREE_CMA_PAGES); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 242 | continue; |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 243 | } |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 244 | |
| 245 | if (zone_idx > classzone_idx) { |
| 246 | if (other_free != NULL) |
| 247 | *other_free -= zone_page_state(zone, |
| 248 | NR_FREE_PAGES); |
| 249 | if (other_file != NULL) |
| 250 | *other_file -= zone_page_state(zone, |
| 251 | NR_FILE_PAGES) |
Liam Mark | 6ffc040 | 2015-02-27 12:59:00 -0800 | [diff] [blame] | 252 | - zone_page_state(zone, NR_SHMEM) |
| 253 | - zone_page_state(zone, NR_SWAPCACHE); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 254 | } else if (zone_idx < classzone_idx) { |
Susheel Khiani | 986fcbb | 2015-02-12 19:00:15 +0530 | [diff] [blame] | 255 | if (zone_watermark_ok(zone, 0, 0, classzone_idx, 0) && |
| 256 | other_free) { |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 257 | if (!use_cma_pages) { |
| 258 | *other_free -= min( |
| 259 | zone->lowmem_reserve[classzone_idx] + |
| 260 | zone_page_state( |
| 261 | zone, NR_FREE_CMA_PAGES), |
| 262 | zone_page_state( |
| 263 | zone, NR_FREE_PAGES)); |
| 264 | } else { |
| 265 | *other_free -= |
| 266 | zone->lowmem_reserve[classzone_idx]; |
| 267 | } |
| 268 | } else { |
Susheel Khiani | 986fcbb | 2015-02-12 19:00:15 +0530 | [diff] [blame] | 269 | if (other_free) |
| 270 | *other_free -= |
| 271 | zone_page_state(zone, NR_FREE_PAGES); |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 272 | } |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 273 | } |
| 274 | } |
| 275 | } |
| 276 | |
Liam Mark | 20cba1b | 2014-03-10 16:06:39 -0700 | [diff] [blame] | 277 | #ifdef CONFIG_HIGHMEM |
| 278 | void adjust_gfp_mask(gfp_t *gfp_mask) |
| 279 | { |
| 280 | struct zone *preferred_zone; |
| 281 | struct zonelist *zonelist; |
| 282 | enum zone_type high_zoneidx; |
| 283 | |
| 284 | if (current_is_kswapd()) { |
| 285 | zonelist = node_zonelist(0, *gfp_mask); |
| 286 | high_zoneidx = gfp_zone(*gfp_mask); |
| 287 | first_zones_zonelist(zonelist, high_zoneidx, NULL, |
| 288 | &preferred_zone); |
| 289 | |
| 290 | if (high_zoneidx == ZONE_NORMAL) { |
| 291 | if (zone_watermark_ok_safe(preferred_zone, 0, |
| 292 | high_wmark_pages(preferred_zone), 0, |
| 293 | 0)) |
| 294 | *gfp_mask |= __GFP_HIGHMEM; |
| 295 | } else if (high_zoneidx == ZONE_HIGHMEM) { |
| 296 | *gfp_mask |= __GFP_HIGHMEM; |
| 297 | } |
| 298 | } |
| 299 | } |
| 300 | #else |
| 301 | void adjust_gfp_mask(gfp_t *unused) |
| 302 | { |
| 303 | } |
| 304 | #endif |
| 305 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 306 | void tune_lmk_param(int *other_free, int *other_file, struct shrink_control *sc) |
| 307 | { |
| 308 | gfp_t gfp_mask; |
| 309 | struct zone *preferred_zone; |
| 310 | struct zonelist *zonelist; |
| 311 | enum zone_type high_zoneidx, classzone_idx; |
| 312 | unsigned long balance_gap; |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 313 | int use_cma_pages; |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 314 | |
| 315 | gfp_mask = sc->gfp_mask; |
Liam Mark | 20cba1b | 2014-03-10 16:06:39 -0700 | [diff] [blame] | 316 | adjust_gfp_mask(&gfp_mask); |
| 317 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 318 | zonelist = node_zonelist(0, gfp_mask); |
| 319 | high_zoneidx = gfp_zone(gfp_mask); |
| 320 | first_zones_zonelist(zonelist, high_zoneidx, NULL, &preferred_zone); |
| 321 | classzone_idx = zone_idx(preferred_zone); |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 322 | use_cma_pages = can_use_cma_pages(gfp_mask); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 323 | |
| 324 | balance_gap = min(low_wmark_pages(preferred_zone), |
| 325 | (preferred_zone->present_pages + |
| 326 | KSWAPD_ZONE_BALANCE_GAP_RATIO-1) / |
| 327 | KSWAPD_ZONE_BALANCE_GAP_RATIO); |
| 328 | |
| 329 | if (likely(current_is_kswapd() && zone_watermark_ok(preferred_zone, 0, |
| 330 | high_wmark_pages(preferred_zone) + SWAP_CLUSTER_MAX + |
| 331 | balance_gap, 0, 0))) { |
| 332 | if (lmk_fast_run) |
| 333 | tune_lmk_zone_param(zonelist, classzone_idx, other_free, |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 334 | other_file, use_cma_pages); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 335 | else |
| 336 | tune_lmk_zone_param(zonelist, classzone_idx, other_free, |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 337 | NULL, use_cma_pages); |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 338 | |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 339 | if (zone_watermark_ok(preferred_zone, 0, 0, _ZONE, 0)) { |
| 340 | if (!use_cma_pages) { |
| 341 | *other_free -= min( |
| 342 | preferred_zone->lowmem_reserve[_ZONE] |
| 343 | + zone_page_state( |
| 344 | preferred_zone, NR_FREE_CMA_PAGES), |
| 345 | zone_page_state( |
| 346 | preferred_zone, NR_FREE_PAGES)); |
| 347 | } else { |
| 348 | *other_free -= |
| 349 | preferred_zone->lowmem_reserve[_ZONE]; |
| 350 | } |
| 351 | } else { |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 352 | *other_free -= zone_page_state(preferred_zone, |
| 353 | NR_FREE_PAGES); |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 354 | } |
| 355 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 356 | lowmem_print(4, "lowmem_shrink of kswapd tunning for highmem " |
| 357 | "ofree %d, %d\n", *other_free, *other_file); |
| 358 | } else { |
| 359 | tune_lmk_zone_param(zonelist, classzone_idx, other_free, |
Liam Mark | 3f1e551 | 2013-03-27 12:34:51 -0700 | [diff] [blame] | 360 | other_file, use_cma_pages); |
| 361 | |
| 362 | if (!use_cma_pages) { |
| 363 | *other_free -= |
| 364 | zone_page_state(preferred_zone, NR_FREE_CMA_PAGES); |
| 365 | } |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 366 | |
| 367 | lowmem_print(4, "lowmem_shrink tunning for others ofree %d, " |
| 368 | "%d\n", *other_free, *other_file); |
| 369 | } |
| 370 | } |
| 371 | |
Colin Cross | cae9bf1 | 2011-06-22 16:05:47 -0700 | [diff] [blame] | 372 | static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc) |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 373 | { |
Anton Vorontsov | 9567000 | 2012-02-06 20:29:47 +0400 | [diff] [blame] | 374 | struct task_struct *tsk; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 375 | struct task_struct *selected = NULL; |
| 376 | int rem = 0; |
| 377 | int tasksize; |
| 378 | int i; |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 379 | int ret = 0; |
| 380 | short min_score_adj = OOM_SCORE_ADJ_MAX + 1; |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 381 | int minfree = 0; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 382 | int selected_tasksize = 0; |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 383 | int selected_oom_score_adj; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 384 | int array_size = ARRAY_SIZE(lowmem_adj); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 385 | int other_free; |
| 386 | int other_file; |
| 387 | unsigned long nr_to_scan = sc->nr_to_scan; |
| 388 | |
| 389 | if (nr_to_scan > 0) { |
| 390 | if (mutex_lock_interruptible(&scan_mutex) < 0) |
| 391 | return 0; |
| 392 | } |
| 393 | |
Arve Hjønnevåg | 231e29f | 2012-09-26 18:01:17 -0700 | [diff] [blame] | 394 | other_free = global_page_state(NR_FREE_PAGES) - totalreserve_pages; |
Liam Mark | 04c5d59 | 2013-08-30 12:10:39 -0700 | [diff] [blame] | 395 | |
Shaohua Li | 2b89993 | 2013-02-22 16:34:37 -0800 | [diff] [blame] | 396 | if (global_page_state(NR_SHMEM) + total_swapcache_pages() < |
Liam Mark | 04c5d59 | 2013-08-30 12:10:39 -0700 | [diff] [blame] | 397 | global_page_state(NR_FILE_PAGES)) |
Steve Kondik | f94910d | 2016-04-14 02:52:21 -0700 | [diff] [blame] | 398 | other_file = global_page_state(NR_FILE_PAGES) + zcache_pages() - |
Liam Mark | 04c5d59 | 2013-08-30 12:10:39 -0700 | [diff] [blame] | 399 | global_page_state(NR_SHMEM) - |
Shaohua Li | 2b89993 | 2013-02-22 16:34:37 -0800 | [diff] [blame] | 400 | total_swapcache_pages(); |
Liam Mark | 04c5d59 | 2013-08-30 12:10:39 -0700 | [diff] [blame] | 401 | else |
| 402 | other_file = 0; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 403 | |
seungho1.park | dca3210 | 2012-07-24 10:20:44 +0900 | [diff] [blame] | 404 | tune_lmk_param(&other_free, &other_file, sc); |
| 405 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 406 | if (lowmem_adj_size < array_size) |
| 407 | array_size = lowmem_adj_size; |
| 408 | if (lowmem_minfree_size < array_size) |
| 409 | array_size = lowmem_minfree_size; |
| 410 | for (i = 0; i < array_size; i++) { |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 411 | minfree = lowmem_minfree[i]; |
| 412 | if (other_free < minfree && other_file < minfree) { |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 413 | min_score_adj = lowmem_adj[i]; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 414 | break; |
| 415 | } |
| 416 | } |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 417 | if (nr_to_scan > 0) { |
| 418 | ret = adjust_minadj(&min_score_adj); |
| 419 | lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %hd\n", |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 420 | nr_to_scan, sc->gfp_mask, other_free, |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 421 | other_file, min_score_adj); |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 422 | } |
| 423 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 424 | rem = global_page_state(NR_ACTIVE_ANON) + |
| 425 | global_page_state(NR_ACTIVE_FILE) + |
| 426 | global_page_state(NR_INACTIVE_ANON) + |
| 427 | global_page_state(NR_INACTIVE_FILE); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 428 | 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] | 429 | lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n", |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 430 | nr_to_scan, sc->gfp_mask, rem); |
| 431 | |
| 432 | if (nr_to_scan > 0) |
| 433 | mutex_unlock(&scan_mutex); |
| 434 | |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 435 | if ((min_score_adj == OOM_SCORE_ADJ_MAX + 1) && |
| 436 | (nr_to_scan > 0)) |
| 437 | trace_almk_shrink(0, ret, other_free, other_file, 0); |
| 438 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 439 | return rem; |
| 440 | } |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 441 | selected_oom_score_adj = min_score_adj; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 442 | |
Anton Vorontsov | 294b271 | 2012-02-06 20:29:41 +0400 | [diff] [blame] | 443 | rcu_read_lock(); |
Anton Vorontsov | 9567000 | 2012-02-06 20:29:47 +0400 | [diff] [blame] | 444 | for_each_process(tsk) { |
| 445 | struct task_struct *p; |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 446 | int oom_score_adj; |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 447 | |
Anton Vorontsov | 9823ec9 | 2012-02-06 20:30:01 +0400 | [diff] [blame] | 448 | if (tsk->flags & PF_KTHREAD) |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 449 | continue; |
Anton Vorontsov | 9823ec9 | 2012-02-06 20:30:01 +0400 | [diff] [blame] | 450 | |
Liam Mark | 3b23c188 | 2013-02-07 14:31:36 -0800 | [diff] [blame] | 451 | /* if task no longer has any memory ignore it */ |
| 452 | if (test_task_flag(tsk, TIF_MM_RELEASED)) |
| 453 | continue; |
| 454 | |
Liam Mark | dabca8d | 2012-09-20 14:42:28 -0700 | [diff] [blame] | 455 | if (time_before_eq(jiffies, lowmem_deathpending_timeout)) { |
| 456 | if (test_task_flag(tsk, TIF_MEMDIE)) { |
| 457 | rcu_read_unlock(); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 458 | /* give the system time to free up the memory */ |
| 459 | msleep_interruptible(20); |
| 460 | mutex_unlock(&scan_mutex); |
Liam Mark | dabca8d | 2012-09-20 14:42:28 -0700 | [diff] [blame] | 461 | return 0; |
| 462 | } |
| 463 | } |
| 464 | |
Anton Vorontsov | 9567000 | 2012-02-06 20:29:47 +0400 | [diff] [blame] | 465 | p = find_lock_task_mm(tsk); |
| 466 | if (!p) |
| 467 | continue; |
| 468 | |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 469 | oom_score_adj = p->signal->oom_score_adj; |
| 470 | if (oom_score_adj < min_score_adj) { |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 471 | task_unlock(p); |
| 472 | continue; |
| 473 | } |
Anton Vorontsov | 9567000 | 2012-02-06 20:29:47 +0400 | [diff] [blame] | 474 | tasksize = get_mm_rss(p->mm); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 475 | task_unlock(p); |
| 476 | if (tasksize <= 0) |
| 477 | continue; |
| 478 | if (selected) { |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 479 | if (oom_score_adj < selected_oom_score_adj) |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 480 | continue; |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 481 | if (oom_score_adj == selected_oom_score_adj && |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 482 | tasksize <= selected_tasksize) |
| 483 | continue; |
| 484 | } |
| 485 | selected = p; |
| 486 | selected_tasksize = tasksize; |
David Rientjes | 940f77b | 2012-02-13 19:28:49 -0800 | [diff] [blame] | 487 | selected_oom_score_adj = oom_score_adj; |
Liam Mark | 398a1b4 | 2014-06-03 13:57:47 -0700 | [diff] [blame] | 488 | lowmem_print(3, "select '%s' (%d), adj %hd, size %d, to kill\n", |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 489 | p->comm, p->pid, oom_score_adj, tasksize); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 490 | } |
| 491 | if (selected) { |
Colin Cross | b79a59c | 2013-05-03 14:57:29 -0700 | [diff] [blame] | 492 | lowmem_print(1, "Killing '%s' (%d), adj %d,\n" \ |
| 493 | " to free %ldkB on behalf of '%s' (%d) because\n" \ |
Liam Mark | 398a1b4 | 2014-06-03 13:57:47 -0700 | [diff] [blame] | 494 | " cache %ldkB is below limit %ldkB for oom_score_adj %hd\n" \ |
| 495 | " Free memory is %ldkB above reserved.\n" \ |
| 496 | " Free CMA is %ldkB\n" \ |
| 497 | " Total reserve is %ldkB\n" \ |
| 498 | " Total free pages is %ldkB\n" \ |
| 499 | " Total file cache is %ldkB\n" \ |
| 500 | " Total zcache is %ldkB\n" \ |
Laura Abbott | 5d15425 | 2014-09-23 19:48:30 -0700 | [diff] [blame] | 501 | " Slab Reclaimable is %ldkB\n" \ |
| 502 | " Slab UnReclaimable is %ldkB\n" \ |
| 503 | " Total Slab is %ldkB\n" \ |
Liam Mark | 398a1b4 | 2014-06-03 13:57:47 -0700 | [diff] [blame] | 504 | " GFP mask is 0x%x\n", |
| 505 | selected->comm, selected->pid, |
| 506 | selected_oom_score_adj, |
| 507 | selected_tasksize * (long)(PAGE_SIZE / 1024), |
| 508 | current->comm, current->pid, |
| 509 | other_file * (long)(PAGE_SIZE / 1024), |
| 510 | minfree * (long)(PAGE_SIZE / 1024), |
| 511 | min_score_adj, |
| 512 | other_free * (long)(PAGE_SIZE / 1024), |
| 513 | global_page_state(NR_FREE_CMA_PAGES) * |
| 514 | (long)(PAGE_SIZE / 1024), |
| 515 | totalreserve_pages * (long)(PAGE_SIZE / 1024), |
| 516 | global_page_state(NR_FREE_PAGES) * |
| 517 | (long)(PAGE_SIZE / 1024), |
| 518 | global_page_state(NR_FILE_PAGES) * |
| 519 | (long)(PAGE_SIZE / 1024), |
| 520 | (long)zcache_pages() * (long)(PAGE_SIZE / 1024), |
Laura Abbott | 5d15425 | 2014-09-23 19:48:30 -0700 | [diff] [blame] | 521 | global_page_state(NR_SLAB_RECLAIMABLE) * |
| 522 | (long)(PAGE_SIZE / 1024), |
| 523 | global_page_state(NR_SLAB_UNRECLAIMABLE) * |
| 524 | (long)(PAGE_SIZE / 1024), |
| 525 | global_page_state(NR_SLAB_RECLAIMABLE) * |
| 526 | (long)(PAGE_SIZE / 1024) + |
| 527 | global_page_state(NR_SLAB_UNRECLAIMABLE) * |
| 528 | (long)(PAGE_SIZE / 1024), |
Liam Mark | 398a1b4 | 2014-06-03 13:57:47 -0700 | [diff] [blame] | 529 | sc->gfp_mask); |
| 530 | |
| 531 | if (lowmem_debug_level >= 2 && selected_oom_score_adj == 0) { |
| 532 | show_mem(SHOW_MEM_FILTER_NODES); |
| 533 | dump_tasks(NULL, NULL); |
Laura Abbott | 3c47bc2 | 2014-09-23 19:31:19 -0700 | [diff] [blame] | 534 | show_mem_call_notifiers(); |
Liam Mark | 398a1b4 | 2014-06-03 13:57:47 -0700 | [diff] [blame] | 535 | } |
| 536 | |
Arve Hjønnevåg | e5d7965 | 2012-01-13 22:21:25 +0400 | [diff] [blame] | 537 | lowmem_deathpending_timeout = jiffies + HZ; |
Anton Vorontsov | 294b271 | 2012-02-06 20:29:41 +0400 | [diff] [blame] | 538 | send_sig(SIGKILL, selected, 0); |
David Rientjes | 83dbbdb | 2012-04-09 16:56:18 -0700 | [diff] [blame] | 539 | set_tsk_thread_flag(selected, TIF_MEMDIE); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 540 | rem -= selected_tasksize; |
Liam Mark | 3b23c188 | 2013-02-07 14:31:36 -0800 | [diff] [blame] | 541 | rcu_read_unlock(); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 542 | /* give the system time to free up the memory */ |
| 543 | msleep_interruptible(20); |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 544 | trace_almk_shrink(selected_tasksize, ret, |
| 545 | other_free, other_file, selected_oom_score_adj); |
| 546 | } else { |
| 547 | trace_almk_shrink(1, ret, other_free, other_file, 0); |
Liam Mark | 3b23c188 | 2013-02-07 14:31:36 -0800 | [diff] [blame] | 548 | rcu_read_unlock(); |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 549 | } |
Liam Mark | 3b23c188 | 2013-02-07 14:31:36 -0800 | [diff] [blame] | 550 | |
Colin Cross | cae9bf1 | 2011-06-22 16:05:47 -0700 | [diff] [blame] | 551 | lowmem_print(4, "lowmem_shrink %lu, %x, return %d\n", |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 552 | nr_to_scan, sc->gfp_mask, rem); |
Liam Mark | 39eaf73 | 2013-01-25 12:40:18 -0800 | [diff] [blame] | 553 | mutex_unlock(&scan_mutex); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 554 | return rem; |
| 555 | } |
| 556 | |
| 557 | static struct shrinker lowmem_shrinker = { |
| 558 | .shrink = lowmem_shrink, |
| 559 | .seeks = DEFAULT_SEEKS * 16 |
| 560 | }; |
| 561 | |
| 562 | static int __init lowmem_init(void) |
| 563 | { |
| 564 | register_shrinker(&lowmem_shrinker); |
Vinayak Menon | 0d145a0 | 2015-03-04 20:41:21 +0530 | [diff] [blame] | 565 | vmpressure_notifier_register(&lmk_vmpr_nb); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | static void __exit lowmem_exit(void) |
| 570 | { |
| 571 | unregister_shrinker(&lowmem_shrinker); |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 572 | } |
| 573 | |
Arve Hjønnevåg | 227b6be | 2012-09-25 17:37:14 -0700 | [diff] [blame] | 574 | #ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES |
| 575 | static int lowmem_oom_adj_to_oom_score_adj(int oom_adj) |
| 576 | { |
| 577 | if (oom_adj == OOM_ADJUST_MAX) |
| 578 | return OOM_SCORE_ADJ_MAX; |
| 579 | else |
| 580 | return (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; |
| 581 | } |
| 582 | |
| 583 | static void lowmem_autodetect_oom_adj_values(void) |
| 584 | { |
| 585 | int i; |
| 586 | int oom_adj; |
| 587 | int oom_score_adj; |
| 588 | int array_size = ARRAY_SIZE(lowmem_adj); |
| 589 | |
| 590 | if (lowmem_adj_size < array_size) |
| 591 | array_size = lowmem_adj_size; |
| 592 | |
| 593 | if (array_size <= 0) |
| 594 | return; |
| 595 | |
| 596 | oom_adj = lowmem_adj[array_size - 1]; |
| 597 | if (oom_adj > OOM_ADJUST_MAX) |
| 598 | return; |
| 599 | |
| 600 | oom_score_adj = lowmem_oom_adj_to_oom_score_adj(oom_adj); |
| 601 | if (oom_score_adj <= OOM_ADJUST_MAX) |
| 602 | return; |
| 603 | |
| 604 | lowmem_print(1, "lowmem_shrink: convert oom_adj to oom_score_adj:\n"); |
| 605 | for (i = 0; i < array_size; i++) { |
| 606 | oom_adj = lowmem_adj[i]; |
| 607 | oom_score_adj = lowmem_oom_adj_to_oom_score_adj(oom_adj); |
| 608 | lowmem_adj[i] = oom_score_adj; |
| 609 | lowmem_print(1, "oom_adj %d => oom_score_adj %d\n", |
| 610 | oom_adj, oom_score_adj); |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | static int lowmem_adj_array_set(const char *val, const struct kernel_param *kp) |
| 615 | { |
| 616 | int ret; |
| 617 | |
| 618 | ret = param_array_ops.set(val, kp); |
| 619 | |
| 620 | /* HACK: Autodetect oom_adj values in lowmem_adj array */ |
| 621 | lowmem_autodetect_oom_adj_values(); |
| 622 | |
| 623 | return ret; |
| 624 | } |
| 625 | |
| 626 | static int lowmem_adj_array_get(char *buffer, const struct kernel_param *kp) |
| 627 | { |
| 628 | return param_array_ops.get(buffer, kp); |
| 629 | } |
| 630 | |
| 631 | static void lowmem_adj_array_free(void *arg) |
| 632 | { |
| 633 | param_array_ops.free(arg); |
| 634 | } |
| 635 | |
| 636 | static struct kernel_param_ops lowmem_adj_array_ops = { |
| 637 | .set = lowmem_adj_array_set, |
| 638 | .get = lowmem_adj_array_get, |
| 639 | .free = lowmem_adj_array_free, |
| 640 | }; |
| 641 | |
| 642 | static const struct kparam_array __param_arr_adj = { |
| 643 | .max = ARRAY_SIZE(lowmem_adj), |
| 644 | .num = &lowmem_adj_size, |
| 645 | .ops = ¶m_ops_int, |
| 646 | .elemsize = sizeof(lowmem_adj[0]), |
| 647 | .elem = lowmem_adj, |
| 648 | }; |
| 649 | #endif |
| 650 | |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 651 | module_param_named(cost, lowmem_shrinker.seeks, int, S_IRUGO | S_IWUSR); |
Arve Hjønnevåg | 227b6be | 2012-09-25 17:37:14 -0700 | [diff] [blame] | 652 | #ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES |
| 653 | __module_param_call(MODULE_PARAM_PREFIX, adj, |
| 654 | &lowmem_adj_array_ops, |
| 655 | .arr = &__param_arr_adj, |
| 656 | S_IRUGO | S_IWUSR, -1); |
| 657 | __MODULE_PARM_TYPE(adj, "array of int"); |
| 658 | #else |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 659 | module_param_array_named(adj, lowmem_adj, int, &lowmem_adj_size, |
| 660 | S_IRUGO | S_IWUSR); |
Arve Hjønnevåg | 227b6be | 2012-09-25 17:37:14 -0700 | [diff] [blame] | 661 | #endif |
Greg Kroah-Hartman | 355b050 | 2011-11-30 20:18:14 +0900 | [diff] [blame] | 662 | module_param_array_named(minfree, lowmem_minfree, uint, &lowmem_minfree_size, |
| 663 | S_IRUGO | S_IWUSR); |
| 664 | 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] | 665 | 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] | 666 | |
| 667 | module_init(lowmem_init); |
| 668 | module_exit(lowmem_exit); |
| 669 | |
| 670 | MODULE_LICENSE("GPL"); |
| 671 | |