Comment 6 for bug 1533833

Thanks - Martin - tested that with the mainline kernel, and it did indeed
give me a pids cgroup:

ubuntu@pitti:~$ cat /proc/self/cgroup
11:hugetlb:/user.slice/user-1000.slice/session-2.scope
10:blkio:/user.slice/user-1000.slice/session-2.scope
9:devices:/user.slice/user-1000.slice/session-2.scope
8:pids:/user.slice/user-1000.slice/session-2.scope
7:memory:/user.slice/user-1000.slice/session-2.scope
6:perf_event:/user.slice/user-1000.slice/session-2.scope
5:cpuset:/user.slice/user-1000.slice/session-2.scope
4:net_cls,net_prio:/user.slice/user-1000.slice/session-2.scope
3:freezer:/user.slice/user-1000.slice/session-2.scope
2:cpu,cpuacct:/user.slice/user-1000.slice/session-2.scope
1:name=systemd:/user.slice/user-1000.slice/session-2.scope