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Subject[-mm PATCH 7/9] Memory controller OOM handling (v4)

From: Pavel Emelianov <xemul@openvz.org>

Out of memory handling for containers over their limit. A task from the
container over limit is chosen using the existing OOM logic and killed.

TODO:
1. As discussed in the OLS BOF session, consider implementing a user
space policy for OOM handling.

Signed-off-by: Pavel Emelianov <xemul@openvz.org>

Signed-off-by: <balbir@linux.vnet.ibm.com>
---
include/linux/memcontrol.h | 1 +
mm/memcontrol.c | 1 +
mm/oom_kill.c | 42 ++++++++++++++++++++++++++++++++++++++----
3 files changed, 40 insertions(+), 4 deletions(-)
diff -puN include/linux/memcontrol.h~mem-control-out-of-memory include/linux/memcontrol.h
--- linux-2.6.23-rc1-mm1/include/linux/memcontrol.h~mem-control-out-of-memory 2007-07-28 01:12:50.000000000 +0530
+++ linux-2.6.23-rc1-mm1-balbir/include/linux/memcontrol.h 2007-07-28 01:12:50.000000000 +0530
@@ -38,6 +38,7 @@ extern unsigned long mem_container_isola
int mode, struct zone *z,
struct mem_container *mem_cont,
int active);
+extern void mem_container_out_of_memory(struct mem_container *mem);

static inline void mem_container_uncharge_page(struct page *page)
{
diff -puN mm/memcontrol.c~mem-control-out-of-memory mm/memcontrol.c
--- linux-2.6.23-rc1-mm1/mm/memcontrol.c~mem-control-out-of-memory 2007-07-28 01:12:50.000000000 +0530
+++ linux-2.6.23-rc1-mm1-balbir/mm/memcontrol.c 2007-07-28 01:12:50.000000000 +0530
@@ -299,6 +299,7 @@ int mem_container_charge(struct page *pa
}

css_put(&mem->css);
+ mem_container_out_of_memory(mem);
goto free_mp;
}

diff -puN mm/oom_kill.c~mem-control-out-of-memory mm/oom_kill.c
--- linux-2.6.23-rc1-mm1/mm/oom_kill.c~mem-control-out-of-memory 2007-07-28 01:12:50.000000000 +0530
+++ linux-2.6.23-rc1-mm1-balbir/mm/oom_kill.c 2007-07-28 01:12:50.000000000 +0530
@@ -24,6 +24,7 @@
#include <linux/cpuset.h>
#include <linux/module.h>
#include <linux/notifier.h>
+#include <linux/memcontrol.h>

int sysctl_panic_on_oom;
/* #define DEBUG */
@@ -47,7 +48,8 @@ int sysctl_panic_on_oom;
* of least surprise ... (be careful when you change it)
*/

-unsigned long badness(struct task_struct *p, unsigned long uptime)
+unsigned long badness(struct task_struct *p, unsigned long uptime,
+ struct mem_container *mem)
{
unsigned long points, cpu_time, run_time, s;
struct mm_struct *mm;
@@ -60,6 +62,13 @@ unsigned long badness(struct task_struct
return 0;
}

+#ifdef CONFIG_CONTAINER_MEM_CONT
+ if (mem != NULL && mm->mem_container != mem) {
+ task_unlock(p);
+ return 0;
+ }
+#endif
+
/*
* The memory size of the process is the basis for the badness.
*/
@@ -204,7 +213,8 @@ static inline int constrained_alloc(stru
*
* (not docbooked, we don't want this one cluttering up the manual)
*/
-static struct task_struct *select_bad_process(unsigned long *ppoints)
+static struct task_struct *select_bad_process(unsigned long *ppoints,
+ struct mem_container *mem)
{
struct task_struct *g, *p;
struct task_struct *chosen = NULL;
@@ -258,7 +268,7 @@ static struct task_struct *select_bad_pr
if (p->oomkilladj == OOM_DISABLE)
continue;

- points = badness(p, uptime.tv_sec);
+ points = badness(p, uptime.tv_sec, mem);
if (points > *ppoints || !chosen) {
chosen = p;
*ppoints = points;
@@ -370,6 +380,30 @@ static int oom_kill_process(struct task_
return oom_kill_task(p);
}

+#ifdef CONFIG_CONTAINER_MEM_CONT
+void mem_container_out_of_memory(struct mem_container *mem)
+{
+ unsigned long points = 0;
+ struct task_struct *p;
+
+ container_lock();
+ rcu_read_lock();
+retry:
+ p = select_bad_process(&points, mem);
+ if (PTR_ERR(p) == -1UL)
+ goto out;
+
+ if (!p)
+ p = current;
+
+ if (oom_kill_process(p, points, "Memory container out of memory"))
+ goto retry;
+out:
+ rcu_read_unlock();
+ container_unlock();
+}
+#endif
+
static BLOCKING_NOTIFIER_HEAD(oom_notify_list);

int register_oom_notifier(struct notifier_block *nb)
@@ -442,7 +476,7 @@ retry:
* Rambo mode: Shoot down a process and hope it solves whatever
* issues we may have.
*/
- p = select_bad_process(&points);
+ p = select_bad_process(&points, NULL);

if (PTR_ERR(p) == -1UL)
goto out;
_
--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL
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