Comment 20 for bug 1551150

update from running system:
$ cat /proc/cgroups
#subsys_name hierarchy num_cgroups enabled
debug 3 1 1
cpu 1 1 1
cpuacct 2 1 1
freezer 4 1 1

$ cat /proc/self/cgroup
5:name=systemd:/
4:freezer:/
3:debug:/
2:cpuacct:/
1:cpu:/