diff options
Diffstat (limited to 'drivers/staging/android/lowmemorykiller.c')
-rw-r--r-- | drivers/staging/android/lowmemorykiller.c | 101 |
1 files changed, 69 insertions, 32 deletions
diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c index 3715d56ca96..fe72240f5a9 100644 --- a/drivers/staging/android/lowmemorykiller.c +++ b/drivers/staging/android/lowmemorykiller.c @@ -34,18 +34,24 @@ static int lowmem_adj[6] = { }; static int lowmem_adj_size = 4; static size_t lowmem_minfree[6] = { - 3*512, // 6MB - 2*1024, // 8MB - 4*1024, // 16MB - 16*1024, // 64MB + 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) +#define lowmem_print(level, x...) \ + do { \ + if (lowmem_debug_level >= (level)) \ + 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_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) @@ -57,46 +63,77 @@ static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask) 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) + global_page_state(NR_FILE_PAGES); - if(lowmem_adj_size < array_size) + 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) + if (lowmem_minfree_size < array_size) array_size = lowmem_minfree_size; - for(i = 0; i < array_size; i++) { - if(other_free < lowmem_minfree[i]) { + 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, ma %d\n", nr_to_scan, gfp_mask, other_free, min_adj); + 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) { - if(p->oomkilladj >= 0 && p->mm) { - tasksize = get_mm_rss(p->mm); - if(nr_to_scan > 0 && tasksize > 0 && p->oomkilladj >= min_adj) { - if(selected == NULL || - p->oomkilladj > selected->oomkilladj || - (p->oomkilladj == selected->oomkilladj && - tasksize > selected_tasksize)) { - selected = p; - selected_tasksize = tasksize; - lowmem_print(2, "select %d (%s), adj %d, size %d, to kill\n", - p->pid, p->comm, p->oomkilladj, tasksize); - } - } - rem += tasksize; + int oom_adj; + + task_lock(p); + if (!p->mm) { + task_unlock(p); + continue; + } + oom_adj = p->oomkilladj; + if (oom_adj < min_adj) { + task_unlock(p); + continue; + } + tasksize = get_mm_rss(p->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 != NULL) { + if (selected) { lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d\n", - selected->pid, selected->comm, - selected->oomkilladj, selected_tasksize); + 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); + lowmem_print(4, "lowmem_shrink %d, %x, return %d\n", + nr_to_scan, gfp_mask, rem); read_unlock(&tasklist_lock); return rem; } |