doraemon's questions

I have ubuntu 21.10 installed. I confirmed that I am using cgroup v2 by running mount, which shows cgrup2 on /sys/fs/cgroup type cgroup2.

When I want to use cgcreate from cgroup-tools to create a new group for cpu:

sudo cgcreate -g cpu:newgroup  # or
sudo cgcreate -g all:newgroup 

it fails with error:

cgcreate: libcgroup initialization failed: Cgroup is not mounted

I have several questions:

• Is this because cgroup-tools is for cgroup v1?
• What should I use to create new cgroups for cgroup v2?
• How to create persistent cgroups (when booting) using config files for cgroup v2?