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Diffstat (limited to 'drivers/staging/android/lowmemorykiller.c')
| -rw-r--r-- | drivers/staging/android/lowmemorykiller.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c deleted file mode 100644 index 935d281a201a..000000000000 --- a/drivers/staging/android/lowmemorykiller.c +++ /dev/null @@ -1,173 +0,0 @@ -/* drivers/misc/lowmemorykiller.c - * - * The lowmemorykiller driver lets user-space specify a set of memory thresholds - * where processes with a range of oom_adj values will get killed. Specify the - * minimum oom_adj values in /sys/module/lowmemorykiller/parameters/adj and the - * number of free pages in /sys/module/lowmemorykiller/parameters/minfree. Both - * files take a comma separated list of numbers in ascending order. - * - * For example, write "0,8" to /sys/module/lowmemorykiller/parameters/adj and - * "1024,4096" to /sys/module/lowmemorykiller/parameters/minfree to kill processes - * with a oom_adj value of 8 or higher when the free memory drops below 4096 pages - * and kill processes with a oom_adj value of 0 or higher when the free memory - * drops below 1024 pages. - * - * The driver considers memory used for caches to be free, but if a large - * percentage of the cached memory is locked this can be very inaccurate - * and processes may not get killed until the normal oom killer is triggered. - * - * Copyright (C) 2007-2008 Google, Inc. - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/oom.h> -#include <linux/sched.h> - -static uint32_t lowmem_debug_level = 2; -static int lowmem_adj[6] = { - 0, - 1, - 6, - 12, -}; -static int lowmem_adj_size = 4; -static size_t lowmem_minfree[6] = { - 3 * 512, /* 6MB */ - 2 * 1024, /* 8MB */ - 4 * 1024, /* 16MB */ - 16 * 1024, /* 64MB */ -}; -static int lowmem_minfree_size = 4; - -#define lowmem_print(level, x...) \ - do { \ - if (lowmem_debug_level >= (level)) \ - printk(x); \ - } while (0) - -static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask) -{ - struct task_struct *p; - struct task_struct *selected = NULL; - int rem = 0; - int tasksize; - int i; - int min_adj = OOM_ADJUST_MAX + 1; - int selected_tasksize = 0; - int selected_oom_adj; - int array_size = ARRAY_SIZE(lowmem_adj); - int other_free = global_page_state(NR_FREE_PAGES); - int other_file = global_page_state(NR_FILE_PAGES); - - if (lowmem_adj_size < array_size) - array_size = lowmem_adj_size; - if (lowmem_minfree_size < array_size) - array_size = lowmem_minfree_size; - for (i = 0; i < array_size; i++) { - if (other_free < lowmem_minfree[i] && - other_file < lowmem_minfree[i]) { - min_adj = lowmem_adj[i]; - break; - } - } - if (nr_to_scan > 0) - lowmem_print(3, "lowmem_shrink %d, %x, ofree %d %d, ma %d\n", - nr_to_scan, gfp_mask, other_free, other_file, - min_adj); - rem = global_page_state(NR_ACTIVE_ANON) + - global_page_state(NR_ACTIVE_FILE) + - global_page_state(NR_INACTIVE_ANON) + - global_page_state(NR_INACTIVE_FILE); - if (nr_to_scan <= 0 || min_adj == OOM_ADJUST_MAX + 1) { - lowmem_print(5, "lowmem_shrink %d, %x, return %d\n", - nr_to_scan, gfp_mask, rem); - return rem; - } - selected_oom_adj = min_adj; - - read_lock(&tasklist_lock); - for_each_process(p) { - struct mm_struct *mm; - int oom_adj; - - task_lock(p); - mm = p->mm; - if (!mm) { - task_unlock(p); - continue; - } - oom_adj = mm->oom_adj; - if (oom_adj < min_adj) { - task_unlock(p); - continue; - } - tasksize = get_mm_rss(mm); - task_unlock(p); - if (tasksize <= 0) - continue; - if (selected) { - if (oom_adj < selected_oom_adj) - continue; - if (oom_adj == selected_oom_adj && - tasksize <= selected_tasksize) - continue; - } - selected = p; - selected_tasksize = tasksize; - selected_oom_adj = oom_adj; - lowmem_print(2, "select %d (%s), adj %d, size %d, to kill\n", - p->pid, p->comm, oom_adj, tasksize); - } - if (selected) { - lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d\n", - selected->pid, selected->comm, - selected_oom_adj, selected_tasksize); - force_sig(SIGKILL, selected); - rem -= selected_tasksize; - } - lowmem_print(4, "lowmem_shrink %d, %x, return %d\n", - nr_to_scan, gfp_mask, rem); - read_unlock(&tasklist_lock); - return rem; -} - -static struct shrinker lowmem_shrinker = { - .shrink = lowmem_shrink, - .seeks = DEFAULT_SEEKS * 16 -}; - -static int __init lowmem_init(void) -{ - register_shrinker(&lowmem_shrinker); - return 0; -} - -static void __exit lowmem_exit(void) -{ - unregister_shrinker(&lowmem_shrinker); -} - -module_param_named(cost, lowmem_shrinker.seeks, int, S_IRUGO | S_IWUSR); -module_param_array_named(adj, lowmem_adj, int, &lowmem_adj_size, - S_IRUGO | S_IWUSR); -module_param_array_named(minfree, lowmem_minfree, uint, &lowmem_minfree_size, - S_IRUGO | S_IWUSR); -module_param_named(debug_level, lowmem_debug_level, uint, S_IRUGO | S_IWUSR); - -module_init(lowmem_init); -module_exit(lowmem_exit); - -MODULE_LICENSE("GPL"); - |