Comment 18 for bug 1668724

FWIW something like:

for d in `tail -n +2 /tmp/2 | awk '{
        if ($2 == 0)
                print $1
        else if (a[$2])
                a[$2] = a[$2]","$1
        else
                a[$2]=$1
};END{
        for(i in a) {
                print a[i]
        }
}'`; do
        mkdir -p /sys/fs/cgroup/$d
        mountpoint -q /sys/fs/cgroup/$d || (mount -n -t cgroup -o $d cgroup /sys/fs/cgroup/$d || rmdir /sys/fs/cgroup/$d || true)
 done

seems to work. Again excluding the possibility of unified hierarchy, which I've not tested.