668 lines
18 KiB
C
668 lines
18 KiB
C
/* drivers/misc/lowmemorykiller.c
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*
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* The lowmemorykiller driver lets user-space specify a set of memory thresholds
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* where processes with a range of oom_score_adj values will get killed. Specify
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* the minimum oom_score_adj values in
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* /sys/module/lowmemorykiller/parameters/adj and the number of free pages in
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* /sys/module/lowmemorykiller/parameters/minfree. Both files take a comma
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* separated list of numbers in ascending order.
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*
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* For example, write "0,8" to /sys/module/lowmemorykiller/parameters/adj and
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* "1024,4096" to /sys/module/lowmemorykiller/parameters/minfree to kill
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* processes with a oom_score_adj value of 8 or higher when the free memory
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* drops below 4096 pages and kill processes with a oom_score_adj value of 0 or
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* higher when the free memory drops below 1024 pages.
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*
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* The driver considers memory used for caches to be free, but if a large
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* percentage of the cached memory is locked this can be very inaccurate
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* and processes may not get killed until the normal oom killer is triggered.
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*
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* Copyright (C) 2007-2008 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/oom.h>
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#include <linux/sched.h>
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#include <linux/swap.h>
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#include <linux/rcupdate.h>
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#include <linux/notifier.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/swap.h>
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#include <linux/cpuset.h>
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#include <linux/show_mem_notifier.h>
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#include <linux/vmpressure.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/almk.h>
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#ifdef CONFIG_HIGHMEM
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#define _ZONE ZONE_HIGHMEM
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#else
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#define _ZONE ZONE_NORMAL
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#endif
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#define CREATE_TRACE_POINTS
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#include "trace/lowmemorykiller.h"
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static uint32_t lowmem_debug_level = 1;
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static short lowmem_adj[6] = {
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0,
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1,
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6,
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12,
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};
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static int lowmem_adj_size = 4;
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static int lowmem_minfree[6] = {
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3 * 512, /* 6MB */
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2 * 1024, /* 8MB */
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4 * 1024, /* 16MB */
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16 * 1024, /* 64MB */
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};
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static int lowmem_minfree_size = 4;
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static int lmk_fast_run = 1;
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static unsigned long lowmem_deathpending_timeout;
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#define lowmem_print(level, x...) \
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do { \
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if (lowmem_debug_level >= (level)) \
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pr_info(x); \
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} while (0)
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static atomic_t shift_adj = ATOMIC_INIT(0);
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static short adj_max_shift = 353;
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/* User knob to enable/disable adaptive lmk feature */
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static int enable_adaptive_lmk;
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module_param_named(enable_adaptive_lmk, enable_adaptive_lmk, int,
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S_IRUGO | S_IWUSR);
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/*
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* This parameter controls the behaviour of LMK when vmpressure is in
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* the range of 90-94. Adaptive lmk triggers based on number of file
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* pages wrt vmpressure_file_min, when vmpressure is in the range of
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* 90-94. Usually this is a pseudo minfree value, higher than the
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* highest configured value in minfree array.
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*/
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static int vmpressure_file_min;
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module_param_named(vmpressure_file_min, vmpressure_file_min, int,
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S_IRUGO | S_IWUSR);
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enum {
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VMPRESSURE_NO_ADJUST = 0,
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VMPRESSURE_ADJUST_ENCROACH,
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VMPRESSURE_ADJUST_NORMAL,
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};
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int adjust_minadj(short *min_score_adj)
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{
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int ret = VMPRESSURE_NO_ADJUST;
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if (!enable_adaptive_lmk)
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return 0;
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if (atomic_read(&shift_adj) &&
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(*min_score_adj > adj_max_shift)) {
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if (*min_score_adj == OOM_SCORE_ADJ_MAX + 1)
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ret = VMPRESSURE_ADJUST_ENCROACH;
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else
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ret = VMPRESSURE_ADJUST_NORMAL;
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*min_score_adj = adj_max_shift;
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}
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atomic_set(&shift_adj, 0);
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return ret;
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}
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static int lmk_vmpressure_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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int other_free, other_file;
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unsigned long pressure = action;
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int array_size = ARRAY_SIZE(lowmem_adj);
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if (!enable_adaptive_lmk)
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return 0;
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if (pressure >= 95) {
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other_file = global_page_state(NR_FILE_PAGES) -
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global_page_state(NR_SHMEM) -
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total_swapcache_pages();
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other_free = global_page_state(NR_FREE_PAGES);
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atomic_set(&shift_adj, 1);
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trace_almk_vmpressure(pressure, other_free, other_file);
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} else if (pressure >= 90) {
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if (lowmem_adj_size < array_size)
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array_size = lowmem_adj_size;
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if (lowmem_minfree_size < array_size)
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array_size = lowmem_minfree_size;
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other_file = global_page_state(NR_FILE_PAGES) -
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global_page_state(NR_SHMEM) -
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total_swapcache_pages();
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other_free = global_page_state(NR_FREE_PAGES);
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if ((other_free < lowmem_minfree[array_size - 1]) &&
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(other_file < vmpressure_file_min)) {
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atomic_set(&shift_adj, 1);
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trace_almk_vmpressure(pressure, other_free,
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other_file);
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}
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} else if (atomic_read(&shift_adj)) {
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/*
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* shift_adj would have been set by a previous invocation
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* of notifier, which is not followed by a lowmem_shrink yet.
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* Since vmpressure has improved, reset shift_adj to avoid
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* false adaptive LMK trigger.
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*/
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trace_almk_vmpressure(pressure, other_free, other_file);
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atomic_set(&shift_adj, 0);
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}
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return 0;
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}
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static struct notifier_block lmk_vmpr_nb = {
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.notifier_call = lmk_vmpressure_notifier,
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};
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static int test_task_flag(struct task_struct *p, int flag)
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{
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struct task_struct *t;
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for_each_thread(p, t) {
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task_lock(t);
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if (test_tsk_thread_flag(t, flag)) {
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task_unlock(t);
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return 1;
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}
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task_unlock(t);
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}
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return 0;
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}
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static DEFINE_MUTEX(scan_mutex);
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int can_use_cma_pages(gfp_t gfp_mask)
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{
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int can_use = 0;
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int mtype = allocflags_to_migratetype(gfp_mask);
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int i = 0;
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int *mtype_fallbacks = get_migratetype_fallbacks(mtype);
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if (is_migrate_cma(mtype)) {
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can_use = 1;
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} else {
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for (i = 0;; i++) {
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int fallbacktype = mtype_fallbacks[i];
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if (is_migrate_cma(fallbacktype)) {
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can_use = 1;
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break;
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}
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if (fallbacktype == MIGRATE_RESERVE)
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break;
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}
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}
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return can_use;
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}
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void tune_lmk_zone_param(struct zonelist *zonelist, int classzone_idx,
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int *other_free, int *other_file,
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int use_cma_pages)
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{
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struct zone *zone;
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struct zoneref *zoneref;
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int zone_idx;
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for_each_zone_zonelist(zone, zoneref, zonelist, MAX_NR_ZONES) {
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zone_idx = zonelist_zone_idx(zoneref);
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if (zone_idx == ZONE_MOVABLE) {
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if (!use_cma_pages && other_free)
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*other_free -=
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zone_page_state(zone, NR_FREE_CMA_PAGES);
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continue;
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}
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if (zone_idx > classzone_idx) {
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if (other_free != NULL)
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*other_free -= zone_page_state(zone,
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NR_FREE_PAGES);
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if (other_file != NULL)
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*other_file -= zone_page_state(zone,
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NR_FILE_PAGES)
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- zone_page_state(zone, NR_SHMEM)
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- zone_page_state(zone, NR_SWAPCACHE);
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} else if (zone_idx < classzone_idx) {
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if (zone_watermark_ok(zone, 0, 0, classzone_idx, 0) &&
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other_free) {
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if (!use_cma_pages) {
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*other_free -= min(
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zone->lowmem_reserve[classzone_idx] +
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zone_page_state(
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zone, NR_FREE_CMA_PAGES),
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zone_page_state(
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zone, NR_FREE_PAGES));
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} else {
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*other_free -=
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zone->lowmem_reserve[classzone_idx];
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}
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} else {
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if (other_free)
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*other_free -=
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zone_page_state(zone, NR_FREE_PAGES);
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}
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}
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}
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}
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#ifdef CONFIG_HIGHMEM
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void adjust_gfp_mask(gfp_t *gfp_mask)
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{
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struct zone *preferred_zone;
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struct zonelist *zonelist;
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enum zone_type high_zoneidx;
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if (current_is_kswapd()) {
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zonelist = node_zonelist(0, *gfp_mask);
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high_zoneidx = gfp_zone(*gfp_mask);
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first_zones_zonelist(zonelist, high_zoneidx, NULL,
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&preferred_zone);
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if (high_zoneidx == ZONE_NORMAL) {
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if (zone_watermark_ok_safe(preferred_zone, 0,
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high_wmark_pages(preferred_zone), 0,
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0))
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*gfp_mask |= __GFP_HIGHMEM;
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} else if (high_zoneidx == ZONE_HIGHMEM) {
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*gfp_mask |= __GFP_HIGHMEM;
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}
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}
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}
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#else
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void adjust_gfp_mask(gfp_t *unused)
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{
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}
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#endif
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void tune_lmk_param(int *other_free, int *other_file, struct shrink_control *sc)
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{
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gfp_t gfp_mask;
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struct zone *preferred_zone;
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struct zonelist *zonelist;
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enum zone_type high_zoneidx, classzone_idx;
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unsigned long balance_gap;
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int use_cma_pages;
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gfp_mask = sc->gfp_mask;
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adjust_gfp_mask(&gfp_mask);
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zonelist = node_zonelist(0, gfp_mask);
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high_zoneidx = gfp_zone(gfp_mask);
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first_zones_zonelist(zonelist, high_zoneidx, NULL, &preferred_zone);
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classzone_idx = zone_idx(preferred_zone);
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use_cma_pages = can_use_cma_pages(gfp_mask);
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balance_gap = min(low_wmark_pages(preferred_zone),
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(preferred_zone->present_pages +
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KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
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KSWAPD_ZONE_BALANCE_GAP_RATIO);
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if (likely(current_is_kswapd() && zone_watermark_ok(preferred_zone, 0,
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high_wmark_pages(preferred_zone) + SWAP_CLUSTER_MAX +
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balance_gap, 0, 0))) {
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if (lmk_fast_run)
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tune_lmk_zone_param(zonelist, classzone_idx, other_free,
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other_file, use_cma_pages);
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else
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tune_lmk_zone_param(zonelist, classzone_idx, other_free,
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NULL, use_cma_pages);
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if (zone_watermark_ok(preferred_zone, 0, 0, _ZONE, 0)) {
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if (!use_cma_pages) {
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*other_free -= min(
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preferred_zone->lowmem_reserve[_ZONE]
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+ zone_page_state(
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preferred_zone, NR_FREE_CMA_PAGES),
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zone_page_state(
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preferred_zone, NR_FREE_PAGES));
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} else {
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*other_free -=
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preferred_zone->lowmem_reserve[_ZONE];
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}
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} else {
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*other_free -= zone_page_state(preferred_zone,
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NR_FREE_PAGES);
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}
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lowmem_print(4, "lowmem_shrink of kswapd tunning for highmem "
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"ofree %d, %d\n", *other_free, *other_file);
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} else {
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tune_lmk_zone_param(zonelist, classzone_idx, other_free,
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other_file, use_cma_pages);
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if (!use_cma_pages) {
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*other_free -=
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zone_page_state(preferred_zone, NR_FREE_CMA_PAGES);
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}
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lowmem_print(4, "lowmem_shrink tunning for others ofree %d, "
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"%d\n", *other_free, *other_file);
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}
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}
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static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
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{
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struct task_struct *tsk;
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struct task_struct *selected = NULL;
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int rem = 0;
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int tasksize;
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int i;
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int ret = 0;
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short min_score_adj = OOM_SCORE_ADJ_MAX + 1;
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int minfree = 0;
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int selected_tasksize = 0;
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short selected_oom_score_adj;
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int array_size = ARRAY_SIZE(lowmem_adj);
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int other_free;
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int other_file;
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unsigned long nr_to_scan = sc->nr_to_scan;
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if (nr_to_scan > 0) {
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if (mutex_lock_interruptible(&scan_mutex) < 0)
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return 0;
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}
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other_free = global_page_state(NR_FREE_PAGES) - totalreserve_pages;
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other_file = global_page_state(NR_FILE_PAGES) -
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global_page_state(NR_SHMEM);
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tune_lmk_param(&other_free, &other_file, sc);
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if (lowmem_adj_size < array_size)
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array_size = lowmem_adj_size;
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if (lowmem_minfree_size < array_size)
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array_size = lowmem_minfree_size;
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for (i = 0; i < array_size; i++) {
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minfree = lowmem_minfree[i];
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if (other_free < minfree && other_file < minfree) {
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min_score_adj = lowmem_adj[i];
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break;
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}
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}
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if (nr_to_scan > 0) {
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ret = adjust_minadj(&min_score_adj);
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lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %hd\n",
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nr_to_scan, sc->gfp_mask, other_free,
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other_file, min_score_adj);
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}
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rem = global_page_state(NR_ACTIVE_ANON) +
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global_page_state(NR_ACTIVE_FILE) +
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global_page_state(NR_INACTIVE_ANON) +
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global_page_state(NR_INACTIVE_FILE);
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if (nr_to_scan <= 0 || min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
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lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n",
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nr_to_scan, sc->gfp_mask, rem);
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if (nr_to_scan > 0)
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mutex_unlock(&scan_mutex);
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if ((min_score_adj == OOM_SCORE_ADJ_MAX + 1) &&
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(nr_to_scan > 0))
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trace_almk_shrink(0, ret, other_free, other_file, 0);
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return rem;
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}
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selected_oom_score_adj = min_score_adj;
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rcu_read_lock();
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for_each_process(tsk) {
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struct task_struct *p;
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short oom_score_adj;
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if (tsk->flags & PF_KTHREAD)
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continue;
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/* if task no longer has any memory ignore it */
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if (test_task_flag(tsk, TIF_MM_RELEASED))
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continue;
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if (time_before_eq(jiffies, lowmem_deathpending_timeout)) {
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if (test_task_flag(tsk, TIF_MEMDIE)) {
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rcu_read_unlock();
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/* give the system time to free up the memory */
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msleep_interruptible(20);
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mutex_unlock(&scan_mutex);
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return 0;
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}
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}
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p = find_lock_task_mm(tsk);
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if (!p)
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continue;
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oom_score_adj = p->signal->oom_score_adj;
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if (oom_score_adj < min_score_adj) {
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task_unlock(p);
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continue;
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}
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tasksize = get_mm_rss(p->mm);
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task_unlock(p);
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if (tasksize <= 0)
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continue;
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if (selected) {
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if (oom_score_adj < selected_oom_score_adj)
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continue;
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if (oom_score_adj == selected_oom_score_adj &&
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tasksize <= selected_tasksize)
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continue;
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}
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selected = p;
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selected_tasksize = tasksize;
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selected_oom_score_adj = oom_score_adj;
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lowmem_print(3, "select '%s' (%d), adj %hd, size %d, to kill\n",
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p->comm, p->pid, oom_score_adj, tasksize);
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}
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if (selected) {
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long cache_size = other_file * (long)(PAGE_SIZE / 1024);
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long cache_limit = minfree * (long)(PAGE_SIZE / 1024);
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long free = other_free * (long)(PAGE_SIZE / 1024);
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trace_lowmemory_kill(selected, cache_size, cache_limit, free);
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lowmem_print(1, "Killing '%s' (%d), adj %hd,\n" \
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" to free %ldkB on behalf of '%s' (%d) because\n" \
|
|
" cache %ldkB is below limit %ldkB for oom_score_adj %hd\n" \
|
|
" Free memory is %ldkB above reserved.\n" \
|
|
" Free CMA is %ldkB\n" \
|
|
" Total reserve is %ldkB\n" \
|
|
" Total free pages is %ldkB\n" \
|
|
" Total file cache is %ldkB\n" \
|
|
" Slab Reclaimable is %ldkB\n" \
|
|
" Slab UnReclaimable is %ldkB\n" \
|
|
" Total Slab is %ldkB\n" \
|
|
" GFP mask is 0x%x\n",
|
|
selected->comm, selected->pid,
|
|
selected_oom_score_adj,
|
|
selected_tasksize * (long)(PAGE_SIZE / 1024),
|
|
current->comm, current->pid,
|
|
cache_size, cache_limit,
|
|
min_score_adj,
|
|
free ,
|
|
global_page_state(NR_FREE_CMA_PAGES) *
|
|
(long)(PAGE_SIZE / 1024),
|
|
totalreserve_pages * (long)(PAGE_SIZE / 1024),
|
|
global_page_state(NR_FREE_PAGES) *
|
|
(long)(PAGE_SIZE / 1024),
|
|
global_page_state(NR_FILE_PAGES) *
|
|
(long)(PAGE_SIZE / 1024),
|
|
global_page_state(NR_SLAB_RECLAIMABLE) *
|
|
(long)(PAGE_SIZE / 1024),
|
|
global_page_state(NR_SLAB_UNRECLAIMABLE) *
|
|
(long)(PAGE_SIZE / 1024),
|
|
global_page_state(NR_SLAB_RECLAIMABLE) *
|
|
(long)(PAGE_SIZE / 1024) +
|
|
global_page_state(NR_SLAB_UNRECLAIMABLE) *
|
|
(long)(PAGE_SIZE / 1024),
|
|
sc->gfp_mask);
|
|
|
|
if (lowmem_debug_level >= 2 && selected_oom_score_adj == 0) {
|
|
show_mem(SHOW_MEM_FILTER_NODES);
|
|
dump_tasks(NULL, NULL);
|
|
show_mem_call_notifiers();
|
|
}
|
|
|
|
lowmem_deathpending_timeout = jiffies + HZ;
|
|
set_tsk_thread_flag(selected, TIF_MEMDIE);
|
|
send_sig(SIGKILL, selected, 0);
|
|
rem -= selected_tasksize;
|
|
rcu_read_unlock();
|
|
/* give the system time to free up the memory */
|
|
msleep_interruptible(20);
|
|
trace_almk_shrink(selected_tasksize, ret,
|
|
other_free, other_file, selected_oom_score_adj);
|
|
} else {
|
|
trace_almk_shrink(1, ret, other_free, other_file, 0);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
lowmem_print(4, "lowmem_shrink %lu, %x, return %d\n",
|
|
nr_to_scan, sc->gfp_mask, rem);
|
|
mutex_unlock(&scan_mutex);
|
|
return rem;
|
|
}
|
|
|
|
static struct shrinker lowmem_shrinker = {
|
|
.shrink = lowmem_shrink,
|
|
.seeks = DEFAULT_SEEKS * 16
|
|
};
|
|
|
|
static int __init lowmem_init(void)
|
|
{
|
|
register_shrinker(&lowmem_shrinker);
|
|
vmpressure_notifier_register(&lmk_vmpr_nb);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit lowmem_exit(void)
|
|
{
|
|
unregister_shrinker(&lowmem_shrinker);
|
|
}
|
|
|
|
#ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES
|
|
static short lowmem_oom_adj_to_oom_score_adj(short oom_adj)
|
|
{
|
|
if (oom_adj == OOM_ADJUST_MAX)
|
|
return OOM_SCORE_ADJ_MAX;
|
|
else
|
|
return (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE;
|
|
}
|
|
|
|
static void lowmem_autodetect_oom_adj_values(void)
|
|
{
|
|
int i;
|
|
short oom_adj;
|
|
short oom_score_adj;
|
|
int array_size = ARRAY_SIZE(lowmem_adj);
|
|
|
|
if (lowmem_adj_size < array_size)
|
|
array_size = lowmem_adj_size;
|
|
|
|
if (array_size <= 0)
|
|
return;
|
|
|
|
oom_adj = lowmem_adj[array_size - 1];
|
|
if (oom_adj > OOM_ADJUST_MAX)
|
|
return;
|
|
|
|
oom_score_adj = lowmem_oom_adj_to_oom_score_adj(oom_adj);
|
|
if (oom_score_adj <= OOM_ADJUST_MAX)
|
|
return;
|
|
|
|
lowmem_print(1, "lowmem_shrink: convert oom_adj to oom_score_adj:\n");
|
|
for (i = 0; i < array_size; i++) {
|
|
oom_adj = lowmem_adj[i];
|
|
oom_score_adj = lowmem_oom_adj_to_oom_score_adj(oom_adj);
|
|
lowmem_adj[i] = oom_score_adj;
|
|
lowmem_print(1, "oom_adj %d => oom_score_adj %d\n",
|
|
oom_adj, oom_score_adj);
|
|
}
|
|
}
|
|
|
|
static int lowmem_adj_array_set(const char *val, const struct kernel_param *kp)
|
|
{
|
|
int ret;
|
|
|
|
ret = param_array_ops.set(val, kp);
|
|
|
|
/* HACK: Autodetect oom_adj values in lowmem_adj array */
|
|
lowmem_autodetect_oom_adj_values();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int lowmem_adj_array_get(char *buffer, const struct kernel_param *kp)
|
|
{
|
|
return param_array_ops.get(buffer, kp);
|
|
}
|
|
|
|
static void lowmem_adj_array_free(void *arg)
|
|
{
|
|
param_array_ops.free(arg);
|
|
}
|
|
|
|
static struct kernel_param_ops lowmem_adj_array_ops = {
|
|
.set = lowmem_adj_array_set,
|
|
.get = lowmem_adj_array_get,
|
|
.free = lowmem_adj_array_free,
|
|
};
|
|
|
|
static const struct kparam_array __param_arr_adj = {
|
|
.max = ARRAY_SIZE(lowmem_adj),
|
|
.num = &lowmem_adj_size,
|
|
.ops = ¶m_ops_short,
|
|
.elemsize = sizeof(lowmem_adj[0]),
|
|
.elem = lowmem_adj,
|
|
};
|
|
#endif
|
|
|
|
module_param_named(cost, lowmem_shrinker.seeks, int, S_IRUGO | S_IWUSR);
|
|
#ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES
|
|
__module_param_call(MODULE_PARAM_PREFIX, adj,
|
|
&lowmem_adj_array_ops,
|
|
.arr = &__param_arr_adj,
|
|
S_IRUGO | S_IWUSR, -1);
|
|
__MODULE_PARM_TYPE(adj, "array of short");
|
|
#else
|
|
module_param_array_named(adj, lowmem_adj, short, &lowmem_adj_size,
|
|
S_IRUGO | S_IWUSR);
|
|
#endif
|
|
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_param_named(lmk_fast_run, lmk_fast_run, int, S_IRUGO | S_IWUSR);
|
|
|
|
module_init(lowmem_init);
|
|
module_exit(lowmem_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|