The patch titled
out of memory notifier
has been added to the -mm tree. Its filename is
out-of-memory-notifier.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: out of memory notifier
From: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
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.
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/s390/mm/cmm.c | 157 +++++++++++++++++++++++++----------------
include/linux/swap.h | 4 +
mm/oom_kill.c | 21 +++++
3 files changed, 121 insertions(+), 61 deletions(-)
diff -puN arch/s390/mm/cmm.c~out-of-memory-notifier arch/s390/mm/cmm.c
--- a/arch/s390/mm/cmm.c~out-of-memory-notifier
+++ a/arch/s390/mm/cmm.c
@@ -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;
+static struct cmm_page_array *cmm_timed_page_list;
+static DEFINE_SPINLOCK(cmm_lock);
-static struct cmm_page_array *cmm_page_list = NULL;
-static struct cmm_page_array *cmm_timed_page_list = NULL;
-
-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;
@@ -69,58 +71,89 @@ cmm_strtoul(const char *cp, char **endp)
}
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;
- *list = pa;
+ 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)
{
@@ -193,21 +226,21 @@ 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();
}
@@ -218,9 +251,9 @@ 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();
}
@@ -231,9 +264,9 @@ 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();
}
@@ -261,7 +294,7 @@ cmm_pages_handler(ctl_table *ctl, int wr
void __user *buffer, size_t *lenp, loff_t *ppos)
{
char buf[16], *p;
- long pages;
+ long nr;
int len;
if (!*lenp || (*ppos && !write)) {
@@ -276,17 +309,17 @@ cmm_pages_handler(ctl_table *ctl, int wr
return -EFAULT;
buf[sizeof(buf) - 1] = '\0';
cmm_skip_blanks(buf, &p);
- pages = cmm_strtoul(p, &p);
+ nr = cmm_strtoul(p, &p);
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))
@@ -302,7 +335,7 @@ cmm_timeout_handler(ctl_table *ctl, int
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)) {
@@ -317,10 +350,10 @@ cmm_timeout_handler(ctl_table *ctl, int
return -EFAULT;
buf[sizeof(buf) - 1] = '\0';
cmm_skip_blanks(buf, &p);
- pages = cmm_strtoul(p, &p);
+ nr = cmm_strtoul(p, &p);
cmm_skip_blanks(p, &p);
seconds = cmm_strtoul(p, &p);
- cmm_set_timeout(pages, seconds);
+ cmm_set_timeout(nr, seconds);
} else {
len = sprintf(buf, "%ld %ld\n",
cmm_timeout_pages, cmm_timeout_seconds);
@@ -373,7 +406,7 @@ 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;
@@ -382,27 +415,27 @@ cmm_smsg_target(char *from, char *msg)
if (strncmp(msg, "SHRINK", 6) == 0) {
if (!cmm_skip_blanks(msg + 6, &msg))
return;
- pages = cmm_strtoul(msg, &msg);
+ nr = cmm_strtoul(msg, &msg);
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 = cmm_strtoul(msg, &msg);
+ nr = cmm_strtoul(msg, &msg);
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 = cmm_strtoul(msg, &msg);
+ nr = cmm_strtoul(msg, &msg);
if (!cmm_skip_blanks(msg, &msg))
return;
seconds = cmm_strtoul(msg, &msg);
cmm_skip_blanks(msg, &msg);
if (*msg == '\0')
- cmm_set_timeout(pages, seconds);
+ cmm_set_timeout(nr, seconds);
}
}
#endif
@@ -418,6 +451,7 @@ 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);
@@ -427,6 +461,7 @@ 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
diff -puN include/linux/swap.h~out-of-memory-notifier include/linux/swap.h
--- a/include/linux/swap.h~out-of-memory-notifier
+++ a/include/linux/swap.h
@@ -6,6 +6,7 @@
#include <linux/mmzone.h>
#include <linux/list.h>
#include <linux/sched.h>
+#include <linux/notifier.h>
#include <asm/atomic.h>
#include <asm/page.h>
@@ -158,6 +159,9 @@ 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 *);
diff -puN mm/oom_kill.c~out-of-memory-notifier mm/oom_kill.c
--- a/mm/oom_kill.c~out-of-memory-notifier
+++ a/mm/oom_kill.c
@@ -21,6 +21,7 @@
#include <linux/timex.h>
#include <linux/jiffies.h>
#include <linux/cpuset.h>
+#include <linux/module.h>
int sysctl_panic_on_oom;
/* #define DEBUG */
@@ -306,6 +307,20 @@ static int oom_kill_process(struct task_
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 +333,12 @@ void out_of_memory(struct zonelist *zone
{
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",
_
Patches currently in -mm which might be from schwidefsky@xxxxxxxxxx are
origin.patch
git-klibc.patch
sata-is-bust-on-s390.patch
git-s390.patch
reduce-max_nr_zones-remove-display-of-counters-for-unconfigured-zones-s390-fix.patch
out-of-memory-notifier.patch
out-of-memory-notifier-tidy.patch
-
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