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Subject[PATCH 29/33] memory controller oom handling v7
From: Pavel Emelianov <xemul@openvz.org>
(container->cgroup renaming by Paul Menage <menage@google.com>)

Out of memory handling for cgroups over their limit. A task from the
cgroup 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 Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Paul Menage <menage@google.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~memory-controller-oom-handling-v7 include/linux/memcontrol.h
--- a/include/linux/memcontrol.h~memory-controller-oom-handling-v7
+++ a/include/linux/memcontrol.h
@@ -39,6 +39,7 @@ extern unsigned long mem_cgroup_isola
int mode, struct zone *z,
struct mem_cgroup *mem_cont,
int active);
+extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem);

static inline void mem_cgroup_uncharge_page(struct page *page)
{
diff -puN mm/memcontrol.c~memory-controller-oom-handling-v7 mm/memcontrol.c
--- a/mm/memcontrol.c~memory-controller-oom-handling-v7
+++ a/mm/memcontrol.c
@@ -322,6 +322,7 @@ int mem_cgroup_charge(struct page *pa
}

css_put(&mem->css);
+ mem_cgroup_out_of_memory(mem);
goto free_pc;
}

diff -puN mm/oom_kill.c~memory-controller-oom-handling-v7 mm/oom_kill.c
--- a/mm/oom_kill.c~memory-controller-oom-handling-v7
+++ a/mm/oom_kill.c
@@ -25,6 +25,7 @@
#include <linux/cpuset.h>
#include <linux/module.h>
#include <linux/notifier.h>
+#include <linux/memcontrol.h>

int sysctl_panic_on_oom;
/* #define DEBUG */
@@ -48,7 +49,8 @@ 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_cgroup *mem)
{
unsigned long points, cpu_time, run_time, s;
struct mm_struct *mm;
@@ -61,6 +63,13 @@ unsigned long badness(struct task_struct
return 0;
}

+#ifdef CONFIG_CGROUP_MEM_CONT
+ if (mem != NULL && mm->mem_cgroup != mem) {
+ task_unlock(p);
+ return 0;
+ }
+#endif
+
/*
* The memory size of the process is the basis for the badness.
*/
@@ -198,7 +207,8 @@ 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_cgroup *mem)
{
struct task_struct *g, *p;
struct task_struct *chosen = NULL;
@@ -252,7 +262,7 @@ 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;
@@ -364,6 +374,30 @@ static int oom_kill_process(struct task_
return oom_kill_task(p);
}

+#ifdef CONFIG_CGROUP_MEM_CONT
+void mem_cgroup_out_of_memory(struct mem_cgroup *mem)
+{
+ unsigned long points = 0;
+ struct task_struct *p;
+
+ cgroup_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 cgroup out of memory"))
+ goto retry;
+out:
+ rcu_read_unlock();
+ cgroup_unlock();
+}
+#endif
+
static BLOCKING_NOTIFIER_HEAD(oom_notify_list);

int register_oom_notifier(struct notifier_block *nb)
@@ -436,7 +470,7 @@ 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;
_
--
-
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