以下Linux发行版默认启用cgroup v2：

* Fedora (since 31)
* Arch Linux (since April 2021)
* openSUSE Tumbleweed (since c. 2021)
* Debian GNU/Linux (since 11)
* Ubuntu (since 21.10)
* RHEL and RHEL-like distributions (since 9)

配置：

```
# sudo cat /etc/default/grub
GRUB_CMDLINE_LINUX="cgroup_no_v1=all systemd.unified_cgroup_hierarchy=1 cgroup_cpu=1 cgroup_enable=cpu"

# sudo update-grub
```

重启，

```
# sudo reboot
```

重启后，

```
# sudo stat -fc %T /sys/fs/cgroup/
cgroup2fs
# cat /sys/fs/cgroup/cgroup.controllers
# cpuset io memory hugetlb pids rdma
```

缺少了cpu项，解决方法：

https://rootlesscontaine.rs/getting-started/common/cgroup2/#enabling-cpu-cpuset-and-io-delegation