Commit 8bc719d3 authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Linus Torvalds
Browse files

[PATCH] out of memory notifier 



Add a notifer chain to the out of memory killer.  If one of the registered
callbacks could release some memory, do not kill the process but return and
retry the allocation that forced the oom killer to run.

The purpose of the notifier is to add a safety net in the presence of
memory ballooners.  If the resource manager inflated the balloon to a size
where memory allocations can not be satisfied anymore, it is better to
deflate the balloon a bit instead of killing processes.

The implementation for the s390 ballooner is included.

[akpm@osdl.org: cleanups]
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 19655d34

arch/s390/mm/cmm.c

+95 −60
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/sched.h>

#include <linux/sysctl.h>

#include <linux/ctype.h>

#include <linux/swap.h>



#include <asm/pgalloc.h>

#include <asm/uaccess.h>
@@ -34,17 +35,18 @@ struct cmm_page_array { 
	unsigned long pages[CMM_NR_PAGES];

};



static long cmm_pages = 0;

static long cmm_timed_pages = 0;

static volatile long cmm_pages_target = 0;

static volatile long cmm_timed_pages_target = 0;

static long cmm_timeout_pages = 0;

static long cmm_timeout_seconds = 0;

static long cmm_pages;

static long cmm_timed_pages;

static volatile long cmm_pages_target;

static volatile long cmm_timed_pages_target;

static long cmm_timeout_pages;

static long cmm_timeout_seconds;



static struct cmm_page_array *cmm_page_list = NULL;

static struct cmm_page_array *cmm_timed_page_list = NULL;

static struct cmm_page_array *cmm_page_list;

static struct cmm_page_array *cmm_timed_page_list;

static DEFINE_SPINLOCK(cmm_lock);



static unsigned long cmm_thread_active = 0;

static unsigned long cmm_thread_active;

static struct work_struct cmm_thread_starter;

static wait_queue_head_t cmm_thread_wait;

static struct timer_list cmm_timer;
@@ -53,58 +55,89 @@ static void cmm_timer_fn(unsigned long); 
static void cmm_set_timer(void);



static long

cmm_alloc_pages(long pages, long *counter, struct cmm_page_array **list)

cmm_alloc_pages(long nr, long *counter, struct cmm_page_array **list)

{

	struct cmm_page_array *pa;

	unsigned long page;

	struct cmm_page_array *pa, *npa;

	unsigned long addr;



	pa = *list;

	while (pages) {

		page = __get_free_page(GFP_NOIO);

		if (!page)

	while (nr) {

		addr = __get_free_page(GFP_NOIO);

		if (!addr)

			break;

		spin_lock(&cmm_lock);

		pa = *list;

		if (!pa || pa->index >= CMM_NR_PAGES) {

			/* Need a new page for the page list. */

			pa = (struct cmm_page_array *)

			spin_unlock(&cmm_lock);

			npa = (struct cmm_page_array *)

				__get_free_page(GFP_NOIO);

			if (!pa) {

				free_page(page);

			if (!npa) {

				free_page(addr);

				break;

			}

			pa->next = *list;

			pa->index = 0;

			spin_lock(&cmm_lock);

			pa = *list;

			if (!pa || pa->index >= CMM_NR_PAGES) {

				npa->next = pa;

				npa->index = 0;

				pa = npa;

				*list = pa;

			} else

				free_page((unsigned long) npa);

		}

		diag10(page);

		pa->pages[pa->index++] = page;

		diag10(addr);

		pa->pages[pa->index++] = addr;

		(*counter)++;

		pages--;

		spin_unlock(&cmm_lock);

		nr--;

	}

	return pages;

	return nr;

}



static void

cmm_free_pages(long pages, long *counter, struct cmm_page_array **list)

static long

cmm_free_pages(long nr, long *counter, struct cmm_page_array **list)

{

	struct cmm_page_array *pa;

	unsigned long page;

	unsigned long addr;



	spin_lock(&cmm_lock);

	pa = *list;

	while (pages) {

	while (nr) {

		if (!pa || pa->index <= 0)

			break;

		page = pa->pages[--pa->index];

		addr = pa->pages[--pa->index];

		if (pa->index == 0) {

			pa = pa->next;

			free_page((unsigned long) *list);

			*list = pa;

		}

		free_page(page);

		free_page(addr);

		(*counter)--;

		pages--;

		nr--;

	}

	spin_unlock(&cmm_lock);

	return nr;

}



static int cmm_oom_notify(struct notifier_block *self,

			  unsigned long dummy, void *parm)

{

	unsigned long *freed = parm;

	long nr = 256;



	nr = cmm_free_pages(nr, &cmm_timed_pages, &cmm_timed_page_list);

	if (nr > 0)

		nr = cmm_free_pages(nr, &cmm_pages, &cmm_page_list);

	cmm_pages_target = cmm_pages;

	cmm_timed_pages_target = cmm_timed_pages;

	*freed += 256 - nr;

	return NOTIFY_OK;

}



static struct notifier_block cmm_oom_nb = {

	.notifier_call = cmm_oom_notify

};



static int

cmm_thread(void *dummy)

{
@@ -177,21 +210,21 @@ cmm_set_timer(void) 
static void

cmm_timer_fn(unsigned long ignored)

{

	long pages;

	long nr;



	pages = cmm_timed_pages_target - cmm_timeout_pages;

	if (pages < 0)

	nr = cmm_timed_pages_target - cmm_timeout_pages;

	if (nr < 0)

		cmm_timed_pages_target = 0;

	else

		cmm_timed_pages_target = pages;

		cmm_timed_pages_target = nr;

	cmm_kick_thread();

	cmm_set_timer();

}



void

cmm_set_pages(long pages)

cmm_set_pages(long nr)

{

	cmm_pages_target = pages;

	cmm_pages_target = nr;

	cmm_kick_thread();

}
@@ -202,9 +235,9 @@ cmm_get_pages(void) 
}



void

cmm_add_timed_pages(long pages)

cmm_add_timed_pages(long nr)

{

	cmm_timed_pages_target += pages;

	cmm_timed_pages_target += nr;

	cmm_kick_thread();

}
@@ -215,9 +248,9 @@ cmm_get_timed_pages(void) 
}



void

cmm_set_timeout(long pages, long seconds)

cmm_set_timeout(long nr, long seconds)

{

	cmm_timeout_pages = pages;

	cmm_timeout_pages = nr;

	cmm_timeout_seconds = seconds;

	cmm_set_timer();

}
@@ -245,7 +278,7 @@ cmm_pages_handler(ctl_table *ctl, int write, struct file *filp, 
		  void __user *buffer, size_t *lenp, loff_t *ppos)

{

	char buf[16], *p;

	long pages;

	long nr;

	int len;



	if (!*lenp || (*ppos && !write)) {
@@ -260,17 +293,17 @@ cmm_pages_handler(ctl_table *ctl, int write, struct file *filp, 
			return -EFAULT;

		buf[sizeof(buf) - 1] = '\0';

		cmm_skip_blanks(buf, &p);

		pages = simple_strtoul(p, &p, 0);

		nr = simple_strtoul(p, &p, 0);

		if (ctl == &cmm_table[0])

			cmm_set_pages(pages);

			cmm_set_pages(nr);

		else

			cmm_add_timed_pages(pages);

			cmm_add_timed_pages(nr);

	} else {

		if (ctl == &cmm_table[0])

			pages = cmm_get_pages();

			nr = cmm_get_pages();

		else

			pages = cmm_get_timed_pages();

		len = sprintf(buf, "%ld\n", pages);

			nr = cmm_get_timed_pages();

		len = sprintf(buf, "%ld\n", nr);

		if (len > *lenp)

			len = *lenp;

		if (copy_to_user(buffer, buf, len))
@@ -286,7 +319,7 @@ cmm_timeout_handler(ctl_table *ctl, int write, struct file *filp, 
		    void __user *buffer, size_t *lenp, loff_t *ppos)

{

	char buf[64], *p;

	long pages, seconds;

	long nr, seconds;

	int len;



	if (!*lenp || (*ppos && !write)) {
@@ -301,10 +334,10 @@ cmm_timeout_handler(ctl_table *ctl, int write, struct file *filp, 
			return -EFAULT;

		buf[sizeof(buf) - 1] = '\0';

		cmm_skip_blanks(buf, &p);

		pages = simple_strtoul(p, &p, 0);

		nr = simple_strtoul(p, &p, 0);

		cmm_skip_blanks(p, &p);

		seconds = simple_strtoul(p, &p, 0);

		cmm_set_timeout(pages, seconds);

		cmm_set_timeout(nr, seconds);

	} else {

		len = sprintf(buf, "%ld %ld\n",

			      cmm_timeout_pages, cmm_timeout_seconds);
@@ -357,7 +390,7 @@ static struct ctl_table cmm_dir_table[] = { 
static void

cmm_smsg_target(char *from, char *msg)

{

	long pages, seconds;

	long nr, seconds;



	if (strlen(sender) > 0 && strcmp(from, sender) != 0)

		return;
@@ -366,27 +399,27 @@ cmm_smsg_target(char *from, char *msg) 
	if (strncmp(msg, "SHRINK", 6) == 0) {

		if (!cmm_skip_blanks(msg + 6, &msg))

			return;

		pages = simple_strtoul(msg, &msg, 0);

		nr = simple_strtoul(msg, &msg, 0);

		cmm_skip_blanks(msg, &msg);

		if (*msg == '\0')

			cmm_set_pages(pages);

			cmm_set_pages(nr);

	} else if (strncmp(msg, "RELEASE", 7) == 0) {

		if (!cmm_skip_blanks(msg + 7, &msg))

			return;

		pages = simple_strtoul(msg, &msg, 0);

		nr = simple_strtoul(msg, &msg, 0);

		cmm_skip_blanks(msg, &msg);

		if (*msg == '\0')

			cmm_add_timed_pages(pages);

			cmm_add_timed_pages(nr);

	} else if (strncmp(msg, "REUSE", 5) == 0) {

		if (!cmm_skip_blanks(msg + 5, &msg))

			return;

		pages = simple_strtoul(msg, &msg, 0);

		nr = simple_strtoul(msg, &msg, 0);

		if (!cmm_skip_blanks(msg, &msg))

			return;

		seconds = simple_strtoul(msg, &msg, 0);

		cmm_skip_blanks(msg, &msg);

		if (*msg == '\0')

			cmm_set_timeout(pages, seconds);

			cmm_set_timeout(nr, seconds);

	}

}

#endif
@@ -402,6 +435,7 @@ cmm_init (void) 
#ifdef CONFIG_CMM_IUCV

	smsg_register_callback(SMSG_PREFIX, cmm_smsg_target);

#endif

	register_oom_notifier(&cmm_oom_nb);

	INIT_WORK(&cmm_thread_starter, (void *) cmm_start_thread, NULL);

	init_waitqueue_head(&cmm_thread_wait);

	init_timer(&cmm_timer);
@@ -411,6 +445,7 @@ cmm_init (void) 
static void

cmm_exit(void)

{

	unregister_oom_notifier(&cmm_oom_nb);

	cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);

	cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);

#ifdef CONFIG_CMM_PROC

include/linux/swap.h

+4 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ 
#include <asm/atomic.h>

#include <asm/page.h>



struct notifier_block;



#define SWAP_FLAG_PREFER	0x8000	/* set if swap priority specified */

#define SWAP_FLAG_PRIO_MASK	0x7fff

#define SWAP_FLAG_PRIO_SHIFT	0
@@ -156,6 +158,8 @@ struct swap_list_t { 


/* linux/mm/oom_kill.c */

extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order);

extern int register_oom_notifier(struct notifier_block *nb);

extern int unregister_oom_notifier(struct notifier_block *nb);



/* linux/mm/memory.c */

extern void swapin_readahead(swp_entry_t, unsigned long, struct vm_area_struct *);

mm/oom_kill.c

+22 −0
Original line number Diff line number Diff line
@@ -21,6 +21,8 @@ 
#include <linux/timex.h>

#include <linux/jiffies.h>

#include <linux/cpuset.h>

#include <linux/module.h>

#include <linux/notifier.h>



int sysctl_panic_on_oom;

/* #define DEBUG */
@@ -306,6 +308,20 @@ static int oom_kill_process(struct task_struct *p, unsigned long points, 
	return oom_kill_task(p, message);

}



static BLOCKING_NOTIFIER_HEAD(oom_notify_list);



int register_oom_notifier(struct notifier_block *nb)

{

	return blocking_notifier_chain_register(&oom_notify_list, nb);

}

EXPORT_SYMBOL_GPL(register_oom_notifier);



int unregister_oom_notifier(struct notifier_block *nb)

{

	return blocking_notifier_chain_unregister(&oom_notify_list, nb);

}

EXPORT_SYMBOL_GPL(unregister_oom_notifier);



/**

 * out_of_memory - kill the "best" process when we run out of memory

 *
@@ -318,6 +334,12 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order) 
{

	struct task_struct *p;

	unsigned long points = 0;

	unsigned long freed = 0;



	blocking_notifier_call_chain(&oom_notify_list, 0, &freed);

	if (freed > 0)

		/* Got some memory back in the last second. */

		return;



	if (printk_ratelimit()) {

		printk("oom-killer: gfp_mask=0x%x, order=%d\n",

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