To list cgroups of a particular process (say PID= 16455)

$ cat /proc/16455/cgroup

Example Output: ```sh

PID = 16455

goyal@fyra:/sys/fs/cgroup$ cat /proc/16455/cgroup

11:name=systemd:/user/1002.user/5.session 10:hugetlb:/user/1002.user/5.session 9:perf_event:/user/1002.user/5.session 8:blkio:/user/1002.user/5.session 7:freezer:/user/1002.user/5.session 6:devices:/user/1002.user/5.session 5:memory:/user/1002.user/5.session 4:cpuacct:/user/1002.user/5.session 3:cpu:/user/1002.user/5.session 2:cpuset:/ ```

Mount existing cgroup hierarichies onto file system

mkdir /sys/fs/cgroup/cg1