staging, android: remove lowmemory killer from the tree

	  It is, in theory, a good memory allocator for low-memory devices,

	  because it can discard shared memory units when under memory pressure.

config ANDROID_LOW_MEMORY_KILLER

	bool "Android Low Memory Killer"

	---help---

	  Registers processes to be killed when low memory conditions, this is useful

	  as there is no particular swap space on android.

	  The registered process will kill according to the priorities in android init

	  scripts (/init.rc), and it defines priority values with minimum free memory size

	  for each priority.

source "drivers/staging/android/ion/Kconfig"

endif # if ANDROID

obj-y					+= ion/

obj-$(CONFIG_ASHMEM)			+= ashmem.o

obj-$(CONFIG_ANDROID_LOW_MEMORY_KILLER)	+= lowmemorykiller.o

/* 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/init.h>

#include <linux/moduleparam.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/oom.h>

#include <linux/sched/signal.h>

#include <linux/swap.h>

#include <linux/rcupdate.h>

#include <linux/profile.h>

#include <linux/notifier.h>

static u32 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 unsigned long lowmem_deathpending_timeout;

#define lowmem_print(level, x...)			\

	do {						\

		if (lowmem_debug_level >= (level))	\

			pr_info(x);			\

	} while (0)

static unsigned long lowmem_count(struct shrinker *s,

				  struct shrink_control *sc)

{

	return global_node_page_state(NR_ACTIVE_ANON) +

		global_node_page_state(NR_ACTIVE_FILE) +

		global_node_page_state(NR_INACTIVE_ANON) +

		global_node_page_state(NR_INACTIVE_FILE);

}

static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)

{

	struct task_struct *tsk;

	struct task_struct *selected = NULL;

	unsigned long 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 = global_page_state(NR_FREE_PAGES) - totalreserve_pages;

	int other_file = global_node_page_state(NR_FILE_PAGES) -

				global_node_page_state(NR_SHMEM) -

				total_swapcache_pages();

	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;

		}

	}

	lowmem_print(3, "lowmem_scan %lu, %x, ofree %d %d, ma %hd\n",

		     sc->nr_to_scan, sc->gfp_mask, other_free,

		     other_file, min_score_adj);

	if (min_score_adj == OOM_SCORE_ADJ_MAX + 1) {

		lowmem_print(5, "lowmem_scan %lu, %x, return 0\n",

			     sc->nr_to_scan, sc->gfp_mask);

		return 0;

	}

	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 (task_lmk_waiting(p) &&

		    time_before_eq(jiffies, lowmem_deathpending_timeout)) {

			task_unlock(p);

			rcu_read_unlock();

			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);

		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) {

		task_lock(selected);

		send_sig(SIGKILL, selected, 0);

		if (selected->mm)

			task_set_lmk_waiting(selected);

		task_unlock(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;

		rem += selected_tasksize;

	}

	lowmem_print(4, "lowmem_scan %lu, %x, return %lu\n",

		     sc->nr_to_scan, sc->gfp_mask, rem);

	rcu_read_unlock();

	return rem;

}

static struct shrinker lowmem_shrinker = {

	.scan_objects = lowmem_scan,

	.count_objects = lowmem_count,

	.seeks = DEFAULT_SEEKS * 16

};

static int __init lowmem_init(void)

{

	register_shrinker(&lowmem_shrinker);

	return 0;

}

device_initcall(lowmem_init);

/*

 * not really modular, but the easiest way to keep compat with existing

 * bootargs behaviour is to continue using module_param here.

 */

module_param_named(cost, lowmem_shrinker.seeks, int, 0644);

module_param_array_named(adj, lowmem_adj, short, &lowmem_adj_size, 0644);

module_param_array_named(minfree, lowmem_minfree, uint, &lowmem_minfree_size,

			 0644);

module_param_named(debug_level, lowmem_debug_level, uint, 0644);

#define PFA_NO_NEW_PRIVS		0	/* May not gain new privileges. */

#define PFA_SPREAD_PAGE			1	/* Spread page cache over cpuset */

#define PFA_SPREAD_SLAB			2	/* Spread some slab caches over cpuset */

#define PFA_LMK_WAITING			3	/* Lowmemorykiller is waiting */

#define TASK_PFA_TEST(name, func)					\

TASK_PFA_SET(SPREAD_SLAB, spread_slab)

TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)

TASK_PFA_TEST(LMK_WAITING, lmk_waiting)

TASK_PFA_SET(LMK_WAITING, lmk_waiting)

static inline void

tsk_restore_flags(struct task_struct *task, unsigned long orig_flags, unsigned long flags)

{