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Subject[PATCH 6/8] Per container OOM killer
When container is completely out of memory some tasks should
die. This is unfair to kill the current task, so a task with
the largest RSS is chosen and killed. The code re-uses current
OOM killer select_bad_process() for task selection.
diff -upr linux-2.6.20.orig/include/linux/rss_container.h linux-2.6.20-2/include/linux/rss_container.h
--- linux-2.6.20.orig/include/linux/rss_container.h 2007-04-09 11:26:12.000000000 +0400
+++ linux-2.6.20-2/include/linux/rss_container.h 2007-04-09 11:26:06.000000000 +0400
@@ -19,6 +19,7 @@
void container_rss_add(struct page_container *);
void container_rss_del(struct page_container *);
void container_rss_release(struct page_container *);
+void container_out_of_memory(struct rss_container *);

void mm_init_container(struct mm_struct *mm, struct task_struct *tsk);
void mm_free_container(struct mm_struct *mm);
diff -upr linux-2.6.20.orig/mm/oom_kill.c linux-2.6.20-2/mm/oom_kill.c
--- linux-2.6.20.orig/mm/oom_kill.c 2007-03-06 19:09:50.000000000 +0300
+++ linux-2.6.20-2/mm/oom_kill.c 2007-04-09 11:26:06.000000000 +0400
@@ -24,6 +24,7 @@
#include <linux/cpuset.h>
#include <linux/module.h>
#include <linux/notifier.h>
+#include <linux/rss_container.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 rss_container *rss)
{
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_RSS_CONTAINER
+ if (rss != NULL && mm->rss_container != rss) {
+ task_unlock(p);
+ return 0;
+ }
+#endif
+
/*
* The memory size of the process is the basis for the badness.
*/
@@ -200,7 +209,8 @@ 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 rss_container *rss)
{
struct task_struct *g, *p;
struct task_struct *chosen = NULL;
@@ -254,7 +264,7 @@ 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, rss);
if (points > *ppoints || !chosen) {
chosen = p;
*ppoints = points;
@@ -435,7 +445,7 @@ 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;
@@ -464,3 +474,27 @@ out:
if (!test_thread_flag(TIF_MEMDIE))
schedule_timeout_uninterruptible(1);
}
+
+#ifdef CONFIG_RSS_CONTAINER
+void container_out_of_memory(struct rss_container *rss)
+{
+ unsigned long points = 0;
+ struct task_struct *p;
+
+ container_lock();
+ read_lock(&tasklist_lock);
+retry:
+ p = select_bad_process(&points, rss);
+ if (PTR_ERR(p) == -1UL)
+ goto out;
+
+ if (!p)
+ p = current;
+
+ if (oom_kill_process(p, points, "Container out of memory"))
+ goto retry;
+out:
+ read_unlock(&tasklist_lock);
+ container_unlock();
+}
+#endif
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