Initial file dump from open source releaseHEADmaster

1 files changed, 977 insertions, 0 deletions

diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
new file mode 100644
index 00000000..cd7d62ae
--- /dev/null
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -0,0 +1,977 @@
+/* drivers/misc/lowmemorykiller.c
+ *
+ * The lowmemorykiller driver lets user-space specify a set of memory thresholds
+ * where processes with a range of oom_score_adj values will get killed. Specify
+ * the minimum oom_score_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_score_adj value of 8 or higher when the free memory
+ * drops below 4096 pages and kill processes with a oom_score_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.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/oom.h>
+#include <linux/sched.h>
+#include <linux/swap.h>
+#include <linux/rcupdate.h>
+#include <linux/notifier.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/swap.h>
+#include <linux/fs.h>
+#include <linux/sched/rt.h>
+
+#ifdef CONFIG_HIGHMEM
+#define _ZONE ZONE_HIGHMEM
+#else
+#define _ZONE ZONE_NORMAL
+#endif
+
+#ifdef CONFIG_OOM_NOTIFIER
+#define MULTIPLE_OOM_KILLER
+#endif
+
+#ifdef MULTIPLE_OOM_KILLER
+#define OOM_DEPTH 3
+#endif
+
+static uint32_t lowmem_debug_level = 1;
+static short lowmem_adj[6] = {
+	0,
+	1,
+	6,
+	12,
+};
+static int lowmem_adj_size = 4;
+static int lowmem_minfree[6] = {
+	3 * 512,	/* 6MB */
+	2 * 1024,	/* 8MB */
+	4 * 1024,	/* 16MB */
+	16 * 1024,	/* 64MB */
+};
+static int lowmem_minfree_size = 4;
+static int lmk_fast_run = 1;
+
+static unsigned long lowmem_deathpending_timeout;
+static unsigned long oom_deathpending_timeout;
+
+#define lowmem_print(level, x...)			\
+	do {						\
+		if (lowmem_debug_level >= (level))	\
+			pr_info(x);			\
+	} while (0)
+
+
+
+#ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES
+static short lowmem_oom_adj_to_oom_score_adj(short oom_adj);
+static int lowmem_oom_score_adj_to_oom_adj(int oom_score_adj);
+#define OOM_SCORE_ADJ_TO_OOM_ADJ(__SCORE_ADJ__)   lowmem_oom_score_adj_to_oom_adj(__SCORE_ADJ__)
+#define OOM_ADJ_TO_OOM_SCORE_ADJ(__ADJ__)   lowmem_oom_adj_to_oom_score_adj(__ADJ__)
+#else
+#define OOM_SCORE_ADJ_TO_OOM_ADJ(__SCORE_ADJ__)  (__SCORE_ADJ__)
+#define OOM_ADJ_TO_OOM_SCORE_ADJ(__ADJ__)    (__ADJ__)
+#endif
+
+#if defined(CONFIG_SEC_DEBUG_LMK_MEMINFO) || defined(CONFIG_E_SHOW_MEM)
+static void dump_tasks_info(void)
+{
+	struct task_struct *p;
+	struct task_struct *task;
+
+	pr_info("[ pid ]   uid  tgid total_vm      rss   swap cpu"
+		" oom_score_adj name\n");
+	for_each_process(p) {
+		/* check unkillable tasks */
+		if (is_global_init(p))
+			continue;
+		if (p->flags & PF_KTHREAD)
+			continue;
+
+		task = find_lock_task_mm(p);
+		if (!task) {
+			/*
+			* This is a kthread or all of p's threads have already
+			* detached their mm's.  There's no need to report
+			* them; they can't be oom killed anyway.
+			*/
+			continue;
+		}
+
+		pr_info("[%5d] %5d %5d %8lu %8lu %6lu %3u         %5d %s\n",
+		task->pid, task_uid(task), task->tgid,
+		task->mm->total_vm, get_mm_rss(task->mm),
+		get_mm_counter(task->mm, MM_SWAPENTS),
+		task_cpu(task),
+		task->signal->oom_score_adj, task->comm);
+		task_unlock(task);
+	}
+}
+#endif
+
+#ifdef CONFIG_ZRAM
+extern ssize_t  zram_mem_usage(void);
+extern ssize_t zram_mem_free_percent(void);
+static uint lmk_lowmem_threshold_adj = 2;
+module_param_named(lmk_lowmem_threshold_adj, lmk_lowmem_threshold_adj, uint, S_IRUGO | S_IWUSR);
+
+static uint zone_wmark_ok_safe_gap = 256;
+module_param_named(zone_wmark_ok_safe_gap, zone_wmark_ok_safe_gap, uint, S_IRUGO | S_IWUSR);
+short cacl_zram_score_adj(void)
+{
+	struct sysinfo swap_info;
+	ssize_t  swap_free_percent = 0;
+	ssize_t zram_free_percent = 0;
+	ssize_t  ret = 0;
+
+	si_swapinfo(&swap_info);
+	if(!swap_info.totalswap)
+	{
+		return  -1;
+	}
+
+	swap_free_percent =  swap_info.freeswap * 100/swap_info.totalswap;
+	zram_free_percent =  zram_mem_free_percent();
+	if(zram_free_percent < 0)
+		return -1;
+
+	ret = (swap_free_percent <  zram_free_percent) ?  swap_free_percent :  zram_free_percent;
+
+	return OOM_ADJ_TO_OOM_SCORE_ADJ(ret*OOM_ADJUST_MAX/100);
+}
+#endif
+
+static int test_task_flag(struct task_struct *p, int flag)
+{
+	struct task_struct *t = p;
+
+	do {
+		task_lock(t);
+		if (test_tsk_thread_flag(t, flag)) {
+			task_unlock(t);
+			return 1;
+		}
+		task_unlock(t);
+	} while_each_thread(p, t);
+
+	return 0;
+}
+
+static DEFINE_MUTEX(scan_mutex);
+
+int can_use_cma_pages(gfp_t gfp_mask)
+{
+	int can_use = 0;
+	int mtype = allocflags_to_migratetype(gfp_mask);
+	int i = 0;
+	int *mtype_fallbacks = get_migratetype_fallbacks(mtype);
+
+	if (is_migrate_cma(mtype)) {
+		can_use = 1;
+	} else {
+		for (i = 0;; i++) {
+			int fallbacktype = mtype_fallbacks[i];
+
+			if (is_migrate_cma(fallbacktype)) {
+				can_use = 1;
+				break;
+			}
+
+			if (fallbacktype == MIGRATE_RESERVE)
+				break;
+		}
+	}
+	return can_use;
+}
+
+void tune_lmk_zone_param(struct zonelist *zonelist, int classzone_idx,
+					int *other_free, int *other_file,
+					int use_cma_pages)
+{
+	struct zone *zone;
+	struct zoneref *zoneref;
+	int zone_idx;
+
+	for_each_zone_zonelist(zone, zoneref, zonelist, MAX_NR_ZONES) {
+		zone_idx = zonelist_zone_idx(zoneref);
+		if (zone_idx == ZONE_MOVABLE) {
+			if (!use_cma_pages)
+				*other_free -=
+				    zone_page_state(zone, NR_FREE_CMA_PAGES);
+			continue;
+		}
+
+		if (zone_idx > classzone_idx) {
+			if (other_free != NULL)
+				*other_free -= zone_page_state(zone,
+							       NR_FREE_PAGES);
+			if (other_file != NULL)
+				*other_file -= zone_page_state(zone,
+							       NR_FILE_PAGES)
+					      - zone_page_state(zone, NR_SHMEM);
+		} else if (zone_idx < classzone_idx) {
+			if (zone_watermark_ok(zone, 0, 0, classzone_idx, 0)) {
+				if (!use_cma_pages) {
+					*other_free -= min(
+					  zone->lowmem_reserve[classzone_idx] +
+					  zone_page_state(
+					    zone, NR_FREE_CMA_PAGES),
+					  zone_page_state(
+					    zone, NR_FREE_PAGES));
+				} else {
+					*other_free -=
+					  zone->lowmem_reserve[classzone_idx];
+				}
+			} else {
+				*other_free -=
+					   zone_page_state(zone, NR_FREE_PAGES);
+			}
+		}
+	}
+}
+
+void tune_lmk_param(int *other_free, int *other_file, struct shrink_control *sc)
+{
+	gfp_t gfp_mask;
+	struct zone *preferred_zone;
+	struct zonelist *zonelist;
+	enum zone_type high_zoneidx, classzone_idx;
+	unsigned long balance_gap;
+	int use_cma_pages;
+
+	gfp_mask = sc->gfp_mask;
+	zonelist = node_zonelist(0, gfp_mask);
+	high_zoneidx = gfp_zone(gfp_mask);
+	first_zones_zonelist(zonelist, high_zoneidx, NULL, &preferred_zone);
+	classzone_idx = zone_idx(preferred_zone);
+	use_cma_pages = can_use_cma_pages(gfp_mask);
+
+	balance_gap = min(low_wmark_pages(preferred_zone),
+			  (preferred_zone->present_pages +
+			   KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
+			   KSWAPD_ZONE_BALANCE_GAP_RATIO);
+
+	if (likely(current_is_kswapd() && zone_watermark_ok(preferred_zone, 0,
+			  high_wmark_pages(preferred_zone) + SWAP_CLUSTER_MAX +
+			  balance_gap, 0, 0))) {
+		if (lmk_fast_run)
+			tune_lmk_zone_param(zonelist, classzone_idx, other_free,
+				       other_file, use_cma_pages);
+		else
+			tune_lmk_zone_param(zonelist, classzone_idx, other_free,
+				       NULL, use_cma_pages);
+
+		if (zone_watermark_ok(preferred_zone, 0, 0, _ZONE, 0)) {
+			if (!use_cma_pages) {
+				*other_free -= min(
+				  preferred_zone->lowmem_reserve[_ZONE]
+				  + zone_page_state(
+				    preferred_zone, NR_FREE_CMA_PAGES),
+				  zone_page_state(
+				    preferred_zone, NR_FREE_PAGES));
+			} else {
+				*other_free -=
+				  preferred_zone->lowmem_reserve[_ZONE];
+			}
+		} else {
+			*other_free -= zone_page_state(preferred_zone,
+						      NR_FREE_PAGES);
+		}
+
+		lowmem_print(4, "lowmem_shrink of kswapd tunning for highmem "
+			     "ofree %d, %d\n", *other_free, *other_file);
+	} else {
+		tune_lmk_zone_param(zonelist, classzone_idx, other_free,
+			       other_file, use_cma_pages);
+
+		if (!use_cma_pages) {
+			*other_free -=
+			  zone_page_state(preferred_zone, NR_FREE_CMA_PAGES);
+		}
+
+		lowmem_print(4, "lowmem_shrink tunning for others ofree %d, "
+			     "%d\n", *other_free, *other_file);
+	}
+}
+
+/*
+  * It's reasonable to grant the dying task an even higher priority to
+  * be sure it will be scheduled sooner and free the desired pmem.
+  * It was suggested using SCHED_FIFO:1 (the lowest RT priority),
+  * so that this task won't interfere with any running RT task.
+  */
+static void boost_dying_task_prio(struct task_struct *p)
+{
+         if (!rt_task(p)) {
+                 struct sched_param param;
+                 param.sched_priority = 1;
+                 sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
+         }
+}
+
+
+typedef struct lmk_debug_info
+{
+	short min_score_adj;
+	short zram_score_adj;
+	ssize_t zram_free_percent;
+	ssize_t zram_mem_usage;
+}lmk_debug_info;
+
+static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
+{
+	lmk_debug_info  lmk_info = {0};
+	struct task_struct *tsk;
+	struct task_struct *selected = NULL;
+	int rem = 0;
+	int tasksize;
+	int i;
+	short min_score_adj = OOM_SCORE_ADJ_MAX + 1;
+	int minfree = 0;
+	int selected_tasksize = 0;
+	short selected_oom_score_adj;
+	int array_size = ARRAY_SIZE(lowmem_adj);
+	int other_free;
+	int other_file;
+	bool is_need_lmk_kill = true;
+	unsigned long nr_to_scan = sc->nr_to_scan;
+	struct sysinfo si;
+#ifdef CONFIG_ZRAM
+	short zram_score_adj = 0;
+#endif
+
+#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
+	static DEFINE_RATELIMIT_STATE(lmk_rs, DEFAULT_RATELIMIT_INTERVAL, 1);
+#endif
+
+#ifdef CONFIG_E_SHOW_MEM
+	/* 600s */
+	static DEFINE_RATELIMIT_STATE(lmk_mem_rs,
+		DEFAULT_RATELIMIT_INTERVAL * 12 * 10, 1);
+	static DEFINE_RATELIMIT_STATE(lmk_meminfo_rs,
+		DEFAULT_RATELIMIT_INTERVAL * 12, 1);
+#endif
+
+	if (nr_to_scan > 0) {
+		if (mutex_lock_interruptible(&scan_mutex) < 0)
+			return 0;
+	}
+
+	other_free = global_page_state(NR_FREE_PAGES);
+	if (global_page_state(NR_SHMEM) + total_swapcache_pages() <
+		global_page_state(NR_FILE_PAGES))
+		other_file = global_page_state(NR_FILE_PAGES) -
+						global_page_state(NR_SHMEM) -
+						total_swapcache_pages();
+	else
+		other_file = 0;
+
+	tune_lmk_param(&other_free, &other_file, sc);
+
+	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++) {
+		minfree = lowmem_minfree[i];
+		if (other_free < minfree && other_file < minfree) {
+			min_score_adj = lowmem_adj[i];
+			break;
+		}
+	}
+
+	if (nr_to_scan > 0)
+		lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %hd\n",
+				nr_to_scan, sc->gfp_mask, other_free,
+				other_file, min_score_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_score_adj == OOM_SCORE_ADJ_MAX + 1) {
+		lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n",
+			     nr_to_scan, sc->gfp_mask, rem);
+
+		if (nr_to_scan > 0)
+			mutex_unlock(&scan_mutex);
+
+		return rem;
+	}
+
+#if 0
+	zram_score_adj = cacl_zram_score_adj();
+	if(zram_score_adj  < 0 )
+	{
+		zram_score_adj = min_score_adj;
+	}
+	else
+	{
+		lmk_info.zram_mem_usage = zram_mem_usage();
+		lmk_info.zram_free_percent = zram_mem_free_percent();
+	}
+
+	lmk_info.min_score_adj = min_score_adj;
+	lmk_info.zram_score_adj = zram_score_adj;
+
+	if(min_score_adj < zram_score_adj)
+	{
+		gfp_t gfp_mask;
+		struct zone *preferred_zone;
+		struct zonelist *zonelist;
+		enum zone_type high_zoneidx;
+		gfp_mask = sc->gfp_mask;
+		zonelist = node_zonelist(0, gfp_mask);
+		high_zoneidx = gfp_zone(gfp_mask);
+		first_zones_zonelist(zonelist, high_zoneidx, NULL, &preferred_zone);
+		if (zram_score_adj <= OOM_ADJ_TO_OOM_SCORE_ADJ(lmk_lowmem_threshold_adj))
+		{
+			printk("%s:min:%d, zram:%d, threshold:%d\r\n", __func__, min_score_adj,zram_score_adj, OOM_ADJ_TO_OOM_SCORE_ADJ(lmk_lowmem_threshold_adj));
+			if(!min_score_adj)
+				is_need_lmk_kill = false;
+
+			zram_score_adj = min_score_adj;
+		}
+		else if (!zone_watermark_ok_safe(preferred_zone, 0, min_wmark_pages(preferred_zone)  + zone_wmark_ok_safe_gap, 0, 0))
+		{
+			zram_score_adj =  (min_score_adj + zram_score_adj)/2;
+		}
+		else
+		{
+			lowmem_print(2, "ZRAM: return min_score_adj:%d, zram_score_adj:%d\r\n", min_score_adj, zram_score_adj);
+			if (nr_to_scan > 0)
+				mutex_unlock(&scan_mutex);
+			return rem;
+		}
+	}
+	lowmem_print(2, "ZRAM: min_score_adj:%d, zram_score_adj:%d\r\n", min_score_adj, zram_score_adj);
+	min_score_adj = zram_score_adj;
+#endif
+
+	selected_oom_score_adj = min_score_adj;
+
+	rcu_read_lock();
+	for_each_process(tsk) {
+		struct task_struct *p;
+		short oom_score_adj;
+
+		if (tsk->flags & PF_KTHREAD)
+			continue;
+
+		if (test_task_flag(tsk, TIF_MEMDIE)) {
+			if (time_before_eq(jiffies, lowmem_deathpending_timeout)) {
+				rcu_read_unlock();
+				/* give the system time to free up the memory */
+				msleep_interruptible(20);
+				mutex_unlock(&scan_mutex);
+				return 0;
+			}
+			continue;
+		}
+
+		p = find_lock_task_mm(tsk);
+		if (!p)
+			continue;
+
+		oom_score_adj = p->signal->oom_score_adj;
+		if (oom_score_adj < min_score_adj) {
+			task_unlock(p);
+			continue;
+		}
+#ifdef CONFIG_ZRAM
+		tasksize = get_mm_rss(p->mm) + get_mm_counter(p->mm, MM_SWAPENTS);
+#else
+		tasksize = get_mm_rss(p->mm);
+#endif
+		task_unlock(p);
+		if (tasksize <= 0)
+			continue;
+		if (selected) {
+			if (oom_score_adj < selected_oom_score_adj)
+				continue;
+			if (oom_score_adj == selected_oom_score_adj &&
+			    tasksize <= selected_tasksize)
+				continue;
+		}
+		selected = p;
+		selected_tasksize = tasksize;
+		selected_oom_score_adj = oom_score_adj;
+		lowmem_print(2, "select '%s' (%d), adj %hd, size %d, to kill\n",
+			     p->comm, p->pid, OOM_SCORE_ADJ_TO_OOM_ADJ(oom_score_adj), tasksize);
+	}
+	if (selected && (selected_oom_score_adj || is_need_lmk_kill)) {
+			si_swapinfo(&si);
+			lowmem_print(1, "Killing '%s' (%d), adj %hd,\n" \
+				"   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"	\
+				"   swaptotal is %ldkB, swapfree is %ldkB\n",
+			     selected->comm, selected->pid,
+			     OOM_SCORE_ADJ_TO_OOM_ADJ(selected_oom_score_adj),
+			     selected_tasksize * (long)(PAGE_SIZE / 1024),
+			     current->comm, current->pid,
+			     other_file * (long)(PAGE_SIZE / 1024),
+			     minfree * (long)(PAGE_SIZE / 1024),
+			     OOM_SCORE_ADJ_TO_OOM_ADJ(min_score_adj),
+			     other_free * (long)(PAGE_SIZE / 1024),
+			     si.totalswap * (long)(PAGE_SIZE / 1024),
+			     si.freeswap * (long)(PAGE_SIZE / 1024));
+
+			lowmem_deathpending_timeout = jiffies + HZ;
+
+			//Improve the priority of killed process can accelerate the process to die,
+			//and the process memory would be released quickly
+			boost_dying_task_prio(selected);
+
+			send_sig(SIGKILL, selected, 0);
+			set_tsk_thread_flag(selected, TIF_MEMDIE);
+			rem -= selected_tasksize;
+			rcu_read_unlock();
+#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
+		if (__ratelimit(&lmk_rs)) {
+			dump_tasks_info();
+		}
+#endif
+#ifdef CONFIG_E_SHOW_MEM
+		if ((0 == min_score_adj)
+			&& (__ratelimit(&lmk_meminfo_rs))) {
+			enhanced_show_mem(E_SHOW_MEM_ALL);
+		} else if (__ratelimit(&lmk_mem_rs)) {
+			if ((!si.freeswap)
+				|| ((si.totalswap / (si.freeswap + 1)) >= 10))
+				enhanced_show_mem(E_SHOW_MEM_CLASSIC);
+			else
+				enhanced_show_mem(E_SHOW_MEM_BASIC);
+		}
+#endif
+		/* give the system time to free up the memory */
+		msleep_interruptible(20);
+	} else
+		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;
+}
+
+
+/*
+ * CONFIG_OOM_NOTIFIER
+ *
+ * The way to select victim by oom-killer provided by
+ * linux kernel is totally different from android policy.
+ * Hence, it makes more sense that we select the oom victim
+ * as android does when LMK is invoked.
+ *
+*/
+#ifdef CONFIG_OOM_NOTIFIER
+
+static int android_oom_handler(struct notifier_block *nb,
+				      unsigned long val, void *data)
+{
+	struct task_struct *tsk;
+#ifdef MULTIPLE_OOM_KILLER
+	struct task_struct *selected[OOM_DEPTH] = {NULL,};
+#else
+	struct task_struct *selected = NULL;
+#endif
+	int rem = 0;
+	int tasksize;
+	int i;
+	int min_score_adj = OOM_SCORE_ADJ_MAX + 1;
+#ifdef MULTIPLE_OOM_KILLER
+	int selected_tasksize[OOM_DEPTH] = {0,};
+	int selected_oom_score_adj[OOM_DEPTH] = {OOM_ADJUST_MAX,};
+	int all_selected_oom = 0;
+	int max_selected_oom_idx = 0;
+#else
+	int selected_tasksize = 0;
+	int selected_oom_score_adj;
+#endif
+#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
+	static DEFINE_RATELIMIT_STATE(oom_rs,
+		DEFAULT_RATELIMIT_INTERVAL/5, 1);
+#endif
+#ifdef CONFIG_E_SHOW_MEM
+	/* 600s */
+	static DEFINE_RATELIMIT_STATE(oom_mem_rs,
+		DEFAULT_RATELIMIT_INTERVAL * 12 * 10, 1);
+	/* 60s */
+	static DEFINE_RATELIMIT_STATE(oom_meminfo_rs,
+		DEFAULT_RATELIMIT_INTERVAL * 12, 1);
+#endif
+
+	unsigned long *freed = data;
+
+	lowmem_print(1, "enter android_oom_handler\n");
+
+	/* show status */
+	pr_warning("%s invoked Android-oom-killer: "
+		" oom_score_adj=%d\n",
+		current->comm, current->signal->oom_score_adj);
+#ifdef CONFIG_SEC_DEBUG_LMK_MEMINFO
+	dump_stack();
+	show_mem(SHOW_MEM_FILTER_NODES);
+	if (__ratelimit(&oom_rs))
+		dump_tasks_info();
+#endif
+
+	min_score_adj = 0;
+#ifdef MULTIPLE_OOM_KILLER
+	for (i = 0; i < OOM_DEPTH; i++)
+		selected_oom_score_adj[i] = min_score_adj;
+#else
+	selected_oom_score_adj = min_score_adj;
+#endif
+
+	read_lock(&tasklist_lock);
+	for_each_process(tsk) {
+		struct task_struct *p;
+		int oom_score_adj;
+#ifdef MULTIPLE_OOM_KILLER
+		int is_exist_oom_task = 0;
+#endif
+
+		if (tsk->flags & PF_KTHREAD)
+			continue;
+
+		if (test_task_flag(tsk, TIF_MEMDIE)) {
+			if (time_before_eq(jiffies, oom_deathpending_timeout)) {
+				read_unlock(&tasklist_lock);
+				/* give the system time to free up the memory */
+				msleep_interruptible(20);
+				return 0;
+			}
+			continue;
+		}
+
+		p = find_lock_task_mm(tsk);
+		if (!p)
+			continue;
+
+		oom_score_adj = p->signal->oom_score_adj;
+		if (oom_score_adj < min_score_adj) {
+			task_unlock(p);
+			continue;
+		}
+		tasksize = get_mm_rss(p->mm);
+		task_unlock(p);
+		if (tasksize <= 0)
+			continue;
+
+		lowmem_print(2, "oom: ------ %d (%s), adj %d, size %d\n",
+			     p->pid, p->comm, oom_score_adj, tasksize);
+#ifdef MULTIPLE_OOM_KILLER
+		if (all_selected_oom < OOM_DEPTH) {
+			for (i = 0; i < OOM_DEPTH; i++) {
+				if (!selected[i]) {
+					is_exist_oom_task = 1;
+					max_selected_oom_idx = i;
+					break;
+				}
+			}
+		} else if (selected_oom_score_adj[max_selected_oom_idx] < oom_score_adj ||
+			(selected_oom_score_adj[max_selected_oom_idx] == oom_score_adj &&
+			selected_tasksize[max_selected_oom_idx] < tasksize)) {
+			is_exist_oom_task = 1;
+		}
+
+		if (is_exist_oom_task) {
+			selected[max_selected_oom_idx] = p;
+			selected_tasksize[max_selected_oom_idx] = tasksize;
+			selected_oom_score_adj[max_selected_oom_idx] = oom_score_adj;
+
+			if (all_selected_oom < OOM_DEPTH)
+				all_selected_oom++;
+
+			if (all_selected_oom == OOM_DEPTH) {
+				for (i = 0; i < OOM_DEPTH; i++) {
+					if (selected_oom_score_adj[i] < selected_oom_score_adj[max_selected_oom_idx])
+						max_selected_oom_idx = i;
+					else if (selected_oom_score_adj[i] == selected_oom_score_adj[max_selected_oom_idx] &&
+						selected_tasksize[i] < selected_tasksize[max_selected_oom_idx])
+						max_selected_oom_idx = i;
+				}
+			}
+
+			lowmem_print(2, "oom: max_selected_oom_idx(%d) select %d (%s), adj %d, \
+					size %d, to kill\n",
+				max_selected_oom_idx, p->pid, p->comm, oom_score_adj, tasksize);
+		}
+#else
+		if (selected) {
+			if (oom_score_adj < selected_oom_score_adj)
+				continue;
+			if (oom_score_adj == selected_oom_score_adj &&
+			    tasksize <= selected_tasksize)
+				continue;
+		}
+		selected = p;
+		selected_tasksize = tasksize;
+		selected_oom_score_adj = oom_score_adj;
+		lowmem_print(2, "oom: select %d (%s), adj %d, size %d, to kill\n",
+			     p->pid, p->comm, oom_score_adj, tasksize);
+#endif
+	}
+	min_score_adj = 1000;
+#ifdef MULTIPLE_OOM_KILLER
+	for (i = 0; i < OOM_DEPTH; i++) {
+		if (selected[i]) {
+			lowmem_print(1, "oom: send sigkill to %d (%s), adj %d,\
+				     size %d\n",
+				     selected[i]->pid, selected[i]->comm,
+				     selected_oom_score_adj[i],
+				     selected_tasksize[i]);
+			if (min_score_adj > selected_oom_score_adj[i])
+				min_score_adj = selected_oom_score_adj[i];
+			send_sig(SIGKILL, selected[i], 0);
+			set_tsk_thread_flag(selected[i], TIF_MEMDIE);
+			rem -= selected_tasksize[i];
+			*freed += (unsigned long)selected_tasksize[i];
+#ifdef OOM_COUNT_READ
+			oom_count++;
+#endif
+
+		}
+	}
+	if(selected[0])
+		oom_deathpending_timeout = jiffies + HZ;
+#else
+	if (selected) {
+		lowmem_print(1, "oom: send sigkill to %d (%s), adj %d, size %d\n",
+			     selected->pid, selected->comm,
+			     selected_oom_score_adj, selected_tasksize);
+		oom_deathpending_timeout = jiffies + HZ;
+		min_score_adj = selected_oom_score_adj;
+		send_sig(SIGKILL, selected, 0);
+		set_tsk_thread_flag(selected, TIF_MEMDIE);
+		rem -= selected_tasksize;
+		*freed += (unsigned long)selected_tasksize;
+#ifdef OOM_COUNT_READ
+		oom_count++;
+#endif
+	}
+#endif
+	read_unlock(&tasklist_lock);
+
+#ifdef CONFIG_E_SHOW_MEM
+	if (!min_score_adj && __ratelimit(&oom_meminfo_rs))
+		enhanced_show_mem(E_SHOW_MEM_CLASSIC);
+	else if (__ratelimit(&oom_mem_rs))
+		enhanced_show_mem(E_SHOW_MEM_BASIC);
+#endif
+
+	/* give the system time to free up the memory */
+	msleep_interruptible(20);
+
+	lowmem_print(2, "oom: get memory %lu", *freed);
+	return rem;
+}
+
+static struct notifier_block android_oom_notifier = {
+	.notifier_call = android_oom_handler,
+};
+#endif /* CONFIG_OOM_NOTIFIER */
+
+#ifdef CONFIG_E_SHOW_MEM
+static int tasks_e_show_mem_handler(struct notifier_block *nb,
+			unsigned long val, void *data)
+{
+	enum e_show_mem_type type = val;
+	struct sysinfo i;
+
+	si_swapinfo(&i);
+	printk("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n");
+	printk("Enhanced Mem-info :TASK\n");
+	printk("Detail:\n");
+	if (E_SHOW_MEM_CLASSIC == type || E_SHOW_MEM_ALL == type)
+		dump_tasks_info();
+	printk("Total used:\n");
+	printk("        anon: %lu kB\n", ((global_page_state(NR_ACTIVE_ANON)
+		+ global_page_state(NR_INACTIVE_ANON)) << PAGE_SHIFT) / 1024);
+	printk("        swaped: %lu kB\n", ((i.totalswap - i.freeswap)
+		<< PAGE_SHIFT) / 1024);
+	return 0;
+}
+
+static struct notifier_block tasks_e_show_mem_notifier = {
+	.notifier_call = tasks_e_show_mem_handler,
+};
+#endif
+
+static struct shrinker lowmem_shrinker = {
+	.shrink = lowmem_shrink,
+	.seeks = DEFAULT_SEEKS * 16
+};
+
+static int __init lowmem_init(void)
+{
+	register_shrinker(&lowmem_shrinker);
+#ifdef CONFIG_OOM_NOTIFIER
+	register_oom_notifier(&android_oom_notifier);
+#endif
+#ifdef CONFIG_E_SHOW_MEM
+	register_e_show_mem_notifier(&tasks_e_show_mem_notifier);
+#endif
+	return 0;
+}
+
+static void __exit lowmem_exit(void)
+{
+	unregister_shrinker(&lowmem_shrinker);
+#ifdef CONFIG_E_SHOW_MEM
+	unregister_e_show_mem_notifier(&tasks_e_show_mem_notifier);
+#endif
+}
+
+#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_oom_score_adj_to_oom_adj(int oom_score_adj)
+{
+	if (oom_score_adj == OOM_SCORE_ADJ_MAX)
+		return OOM_ADJUST_MAX;
+	else
+		return  (oom_score_adj * (-OOM_DISABLE) + OOM_SCORE_ADJ_MAX - 1) /  OOM_SCORE_ADJ_MAX;
+}
+
+static uint32_t oom_score_to_oom_enable = 1;
+
+static int lowmem_adj_array_get(char *buffer, const struct kernel_param *kp)
+{
+	if(oom_score_to_oom_enable)
+	{
+		int oom_adj[6] = {0};
+		int t = 0;
+		for(t = 0; t < 6; t++)
+		{
+			oom_adj[t] = lowmem_oom_score_adj_to_oom_adj(lowmem_adj[t]);
+		}
+		return sprintf(buffer, "%d,%d,%d,%d,%d,%d", oom_adj[0], oom_adj[1], oom_adj[2], oom_adj[3], oom_adj[4], oom_adj[5]);
+	}
+
+	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 = &param_ops_short,
+	.elemsize = sizeof(lowmem_adj[0]),
+	.elem = lowmem_adj,
+};
+
+
+module_param_array_named(oom_score_adj, lowmem_adj, short, &lowmem_adj_size, S_IRUGO | S_IWUSR);
+
+module_param_named(oom_score_to_oom_enable, oom_score_to_oom_enable, uint, S_IRUGO | S_IWUSR);
+
+#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");
+