diff options
Diffstat (limited to 'drivers/staging/android/lowmemorykiller.c')
| -rw-r--r-- | drivers/staging/android/lowmemorykiller.c | 41 |
1 files changed, 28 insertions, 13 deletions
diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c index f934393f3959..935d281a201a 100644 --- a/drivers/staging/android/lowmemorykiller.c +++ b/drivers/staging/android/lowmemorykiller.c @@ -1,5 +1,21 @@ /* 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 @@ -19,12 +35,6 @@ #include <linux/oom.h> #include <linux/sched.h> -static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask); - -static struct shrinker lowmem_shrinker = { - .shrink = lowmem_shrink, - .seeks = DEFAULT_SEEKS * 16 -}; static uint32_t lowmem_debug_level = 2; static int lowmem_adj[6] = { 0, @@ -47,13 +57,6 @@ static int lowmem_minfree_size = 4; printk(x); \ } while (0) -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); - static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask) { struct task_struct *p; @@ -140,6 +143,11 @@ static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask) return rem; } +static struct shrinker lowmem_shrinker = { + .shrink = lowmem_shrink, + .seeks = DEFAULT_SEEKS * 16 +}; + static int __init lowmem_init(void) { register_shrinker(&lowmem_shrinker); @@ -151,6 +159,13 @@ 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); |