EOPNOTSUPP while trying to enable memory on cgroup.subtree_control

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Hi,

Since some weeks ago 'docker stats' is not showing memory and io:
https://gitlab.alpinelinux.org/alpine/aports/-/issues/15506

After trying to fix it I noticed this behaviour:
  /sys/fs/cgroup/docker/cgroup.controllers has:
    cpuset cpu io memory hugetlb pids
but trying:
  echo +memory > /sys/fs/cgroup/docker/cgroup.subtree_control results:
write(1, "+memory\n", 8)                = -1 EOPNOTSUPP (Not supported)

'cgroup.type' is "domain threaded", I'm not sure if it affects.


Any clue? Is there some bug here or could be some problem with kernel
build/config?

Thanks!




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