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+++ b/Documentation/cgroups/memory.txt
@@ -493,6 +493,8 @@ It's applicable for root and non-root cgroup.
10. OOM Control
+memory.oom_control file is for OOM notification and other controls.
+
Memory controler implements oom notifier using cgroup notification
API (See cgroups.txt). It allows to register multiple oom notification
delivery and gets notification when oom happens.
@@ -505,6 +507,27 @@ To register a notifier, application need:
Application will be notifier through eventfd when oom happens.
OOM notification doesn't work for root cgroup.
+You can disable oom-killer by writing "1" to memory.oom_control file.
+As.
+ #echo 1 > memory.oom_control
+
+This operation is only allowed to the top cgroup of subhierarchy.
+If oom-killer is disabled, tasks under cgroup will hang/sleep
+in memcg's oom-waitq when they request accountable memory.
+
+For running them, you have to relax the memcg's oom sitaution by
+ * enlarge limit or reduce usage.
+To reduce usage,
+ * kill some tasks.
+ * move some tasks to other group with account migration.
+ * remove some files (on tmpfs?)
+
+Then, stopped tasks will work again.
+
+At reading, current status of OOM is shown.
+ oom_kill_disable 0 or 1 (if 1, oom-killer is disabled)
+ under_oom 0 or 1 (if 1, the memcg is under OOM,tasks may
+ be stopped.)
11. TODO