static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
{
	struct task_struct *tsk;
	struct task_struct *selected = NULL;
	int rem = 0;
	int tasksize;
	int i;
	int ret = 0;
	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 = global_page_state(NR_FREE_PAGES);
	int other_file = global_page_state(NR_FILE_PAGES) -
						global_page_state(NR_SHMEM);
	struct reclaim_state *reclaim_state = current->reclaim_state;

#ifdef CONFIG_ZSWAP
	/* to prevent other_file underflow and then be negative */
	if (other_file > total_swapcache_pages())
		other_file -= total_swapcache_pages();
	else
		other_file = 0;
#endif

	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 (sc->nr_to_scan > 0) {
		ret = adjust_minadj(&min_score_adj);
		lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %hd\n",
				sc->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 (sc->nr_to_scan <= 0 || min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
		lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n",
			     sc->nr_to_scan, sc->gfp_mask, rem);

		if ((min_score_adj == OOM_SCORE_ADJ_MAX + 1) &&
			(sc->nr_to_scan > 0))
			trace_almk_shrink(0, ret, other_free, other_file, 0);

		return rem;
	}
	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;

		p = find_lock_task_mm(tsk);
		if (!p)
			continue;

		if (test_tsk_thread_flag(p, TIF_MEMDIE) &&
		    time_before_eq(jiffies, lowmem_deathpending_timeout)) {
			task_unlock(p);
			rcu_read_unlock();
			/* give the system time to free up the memory */
			msleep_interruptible(20);
			return 0;
		}
		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);
#if defined(CONFIG_ZSWAP)
		if (atomic_read(&zswap_stored_pages)) {
			lowmem_print(3, "shown tasksize : %d\n", tasksize);
			tasksize += (int)zswap_pool_pages * get_mm_counter(p->mm, MM_SWAPENTS)
				/ atomic_read(&zswap_stored_pages);
			lowmem_print(3, "real tasksize : %d\n", tasksize);
		}
#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, tasksize);
	}
	if (selected) {
		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",
			     selected->comm, selected->pid,
			     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),
			     min_score_adj,
			     other_free * (long)(PAGE_SIZE / 1024));
		lowmem_deathpending_timeout = jiffies + HZ;
		send_sig(SIGKILL, selected, 0);
		set_tsk_thread_flag(selected, TIF_MEMDIE);
		rem -= selected_tasksize;
		rcu_read_unlock();
		lowmem_lmkcount++;
		/* give the system time to free up the memory */
		msleep_interruptible(20);

		if(reclaim_state)
			reclaim_state->reclaimed_slab += selected_tasksize;
		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",
		     sc->nr_to_scan, sc->gfp_mask, rem);
	return rem;
}
static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
{
	struct task_struct *tsk;
	struct task_struct *selected[MANAGED_PROCESS_TYPES] = {NULL};
	int rem = 0;
	int ret = 0;
	int tasksize;
	int i;
	short min_score_adj = OOM_SCORE_ADJ_MAX + 1;
	int minfree = 0;
	enum lowmem_process_type proc_type = KILLABLE_PROCESS;
	int selected_tasksize[MANAGED_PROCESS_TYPES] = {0};
	int selected_oom_score_adj[MANAGED_PROCESS_TYPES];
	int array_size = ARRAY_SIZE(lowmem_adj);
	int other_free = global_page_state(NR_FREE_PAGES) - totalreserve_pages;
	int other_file = global_page_state(NR_FILE_PAGES) -
						global_page_state(NR_SHMEM);
	struct reclaim_state *reclaim_state = current->reclaim_state;

#ifdef CONFIG_ZSWAP
	/* to prevent other_file underflow and then be negative */
	if (other_file > total_swapcache_pages())
		other_file -= total_swapcache_pages();
	else
		other_file = 0;
#endif

	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 (sc->nr_to_scan > 0) {
		ret = adjust_minadj(&min_score_adj);
		lowmem_print(3, "lowmem_shrink %lu, %x, ofree %d %d, ma %hd\n",
				sc->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 (sc->nr_to_scan <= 0 || min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
		lowmem_print(5, "lowmem_shrink %lu, %x, return %d\n",
			     sc->nr_to_scan, sc->gfp_mask, rem);

		if ((min_score_adj == OOM_SCORE_ADJ_MAX + 1) &&
			(sc->nr_to_scan > 0))
			trace_almk_shrink(0, ret, other_free, other_file, 0);

		return rem;
	}

	/* Set the initial oom_score_adj for each managed process type */
	for (proc_type = KILLABLE_PROCESS; proc_type < MANAGED_PROCESS_TYPES; proc_type++)
		selected_oom_score_adj[proc_type] = min_score_adj;

	rcu_read_lock();
	for_each_process(tsk) {
		struct task_struct *p;
		short oom_score_adj;

		if (tsk->flags & PF_KTHREAD)
			continue;

		p = find_lock_task_mm(tsk);
		if (!p)
			continue;

		if (test_tsk_thread_flag(p, TIF_MEMDIE) &&
		    time_before_eq(jiffies, lowmem_deathpending_timeout)) {
			task_unlock(p);
			rcu_read_unlock();
			/* give the system time to free up the memory */
			msleep_interruptible(20);
			return 0;
		}
		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);
#if defined(CONFIG_ZSWAP)
		if (atomic_read(&zswap_stored_pages)) {
			lowmem_print(3, "shown tasksize : %d\n", tasksize);
			tasksize += atomic_read(&zswap_pool_pages) * get_mm_counter(p->mm, MM_SWAPENTS)
				/ atomic_read(&zswap_stored_pages);
			lowmem_print(3, "real tasksize : %d\n", tasksize);
		}
#endif

		task_unlock(p);
		if (tasksize <= 0)
			continue;
#ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_DO_NOT_KILL_PROCESS
		/* Check if the process name is contained inside the process to be preserved lists */
		if (is_in_donotkill_proc_list(p->comm)) {
			/* This user process must be preserved from killing */
			proc_type = DO_NOT_KILL_PROCESS;
			lowmem_print(2, "The process '%s' is inside the donotkill_proc_names", p->comm);
		} else if (is_in_donotkill_sysproc_list(p->comm)) {
			/* This system process must be preserved from killing */
			proc_type = DO_NOT_KILL_SYSTEM_PROCESS;
			lowmem_print(2, "The process '%s' is inside the donotkill_sysproc_names", p->comm);
		}
#endif
		if (selected[proc_type]) {
			if (oom_score_adj < selected_oom_score_adj[proc_type])
				continue;
			if (oom_score_adj == selected_oom_score_adj[proc_type] &&
			    tasksize <= selected_tasksize[proc_type])
				continue;
		}
		selected[proc_type] = p;
		selected_tasksize[proc_type] = tasksize;
		selected_oom_score_adj[proc_type] = oom_score_adj;
		lowmem_print(2, "select '%s' (%d), adj %hd, size %d, to kill\n",
			     p->comm, p->pid, oom_score_adj, tasksize);
	}

	/* For each managed process type check if a process to be killed has been found:
	 * - check first if a standard killable process has been found, if so kill it
	 * - if there is no killable process, then check if a user process has been found,
	 *   if so kill it to prevent system slowdowns, hangs, etc.
	 * - if there is no killable and user process, then check if a system process has been found,
	 *   if so kill it to prevent system slowdowns, hangs, etc. */
	for (proc_type = KILLABLE_PROCESS; proc_type < MANAGED_PROCESS_TYPES; proc_type++) {
		if (selected[proc_type]) {
			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",
			     	selected[proc_type]->comm, selected[proc_type]->pid,
			     	selected_oom_score_adj[proc_type],
			     	selected_tasksize[proc_type] * (long)(PAGE_SIZE / 1024),
			     	current->comm, current->pid,
			     	other_file * (long)(PAGE_SIZE / 1024),
			     	minfree * (long)(PAGE_SIZE / 1024),
			     	min_score_adj,
			     	other_free * (long)(PAGE_SIZE / 1024));
			lowmem_deathpending_timeout = jiffies + HZ;
			send_sig(SIGKILL, selected[proc_type], 0);
			set_tsk_thread_flag(selected[proc_type], TIF_MEMDIE);
			rem -= selected_tasksize[proc_type];
			break;
		} else {
			trace_almk_shrink(1, ret, other_free, other_file, 0);
			rcu_read_unlock();
	 	}
	}

	trace_almk_shrink(1, ret, other_free, other_file, 0);
	rcu_read_unlock();

		lowmem_lmkcount++;

	lowmem_print(4, "lowmem_shrink %lu, %x, return %d\n",
		     sc->nr_to_scan, sc->gfp_mask, rem);
	return rem;
}