I want to try cgroup v2 but am not sure if it is installed on my linux machine
>> uname -r 4.14.66-041466-generic
Since cgroup v2 is available in 4.12.0-rc5, I assume it should be available in the kernel version I am using.
However, it does not seem like my system has cgroup v2 as the memory interface files mentioned in its documentation are not available on my system.
It seems like I still have cgroup v1.
/sys/fs/cgroup/memory# ls cgroup.clone_children memory.kmem.failcnt memory.kmem.tcp.usage_in_bytes memory.memsw.usage_in_bytes memory.swappiness cgroup.event_control memory.kmem.limit_in_bytes memory.kmem.usage_in_bytes memory.move_charge_at_immigrate memory.usage_in_bytes cgroup.procs memory.kmem.max_usage_in_bytes memory.limit_in_bytes memory.numa_stat memory.use_hierarchy cgroup.sane_behavior memory.kmem.slabinfo memory.max_usage_in_bytes memory.oom_control notify_on_release docker memory.kmem.tcp.failcnt memory.memsw.failcnt memory.pressure_level release_agent memory.failcnt memory.kmem.tcp.limit_in_bytes memory.memsw.limit_in_bytes memory.soft_limit_in_bytes tasks memory.force_empty memory.kmem.tcp.max_usage_in_bytes memory.memsw.max_usage_in_bytes memory.stat
Follow-up questions Thanks Brian for the help. Please let me know if I should be creating a new question but I think it might be helpful to other if I just ask my questions here.
1) I am unable to add cgroup controllers, following the command in the doc
>> echo "+cpu +memory -io" > cgroup.subtree_control
However, I got "echo: write error: Invalid argument". Am I missing a prerequisite to this step?
2) I ran a docker container but the docker daemon log complained about not able to find "/sys/fs/cgroup/cpuset/docker/cpuset.cpus". It seems like docker is still expecting cgroupv1. What is the best way to enable cgroupv2 support on my docker daemon?
docker -v Docker version 17.09.1-ce, build aedabb7