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authorPavel Emelianov <xemul@openvz.org>2008-02-07 00:13:58 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-07 08:42:19 -0800
commitc7ba5c9e8176704bfac0729875fa62798037584d (patch)
tree00df1c4cb67e313cdb66233381b4cee275fd46c0
parent0eea10301708c64a6b793894c156e21ddd15eb64 (diff)
Memory controller: OOM handling
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. [akpm@linux-foundation.org: fix build due to oom-killer changes] Signed-off-by: Pavel Emelianov <xemul@openvz.org> Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Paul Menage <menage@google.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Kirill Korotaev <dev@sw.ru> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: David Rientjes <rientjes@google.com> Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/memcontrol.h1
-rw-r--r--mm/memcontrol.c1
-rw-r--r--mm/oom_kill.c43
3 files changed, 41 insertions, 4 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 9c3c1c97c197..9bbbf524ba8f 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -39,6 +39,7 @@ extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
int mode, struct zone *z,
struct mem_cgroup *mem_cont,
int active);
+extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
static inline void mem_cgroup_uncharge_page(struct page *page)
{
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d73692279ab1..5260658c90aa 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -329,6 +329,7 @@ retry:
}
css_put(&mem->css);
+ mem_cgroup_out_of_memory(mem, GFP_KERNEL);
goto free_pc;
}
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index c1850bf991cd..64751dc9d997 100644
--- a/mm/oom_kill.c
+++ b/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;
int sysctl_oom_kill_allocating_task;
@@ -50,7 +51,8 @@ static DEFINE_SPINLOCK(zone_scan_mutex);
* 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;
@@ -63,6 +65,13 @@ unsigned long badness(struct task_struct *p, unsigned long uptime)
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.
*/
@@ -193,7 +202,8 @@ static inline enum oom_constraint constrained_alloc(struct zonelist *zonelist,
*
* (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;
@@ -247,7 +257,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints)
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;
@@ -368,6 +378,31 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
return oom_kill_task(p);
}
+#ifdef CONFIG_CGROUP_MEM_CONT
+void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
+{
+ 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, gfp_mask, 0, 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)
@@ -484,7 +519,7 @@ 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;