# echo 0 > memory.use_hierarchy
-NOTE1: Enabling/disabling will fail if the cgroup already has other
- cgroups created below it.
+NOTE1: Enabling/disabling will fail if either the cgroup already has other
+ cgroups created below it, or if the parent cgroup has use_hierarchy
+ enabled.
NOTE2: When panic_on_oom is set to "2", the whole system will panic in
case of an OOM event in any cgroup.