same phenomenon after update latest v4.16 kernel.
this should have concern with systemd-logind.service, tasks have been added 
into session cgroup.

root@i-dztv2guv:~# cat /proc/$(pidof dd)/cgroup | grep blkio
6:blkio:/user.slice/user-0.slice/session-1.scope

I can throttle for this single session, but it is impossible to throttle
for all sessions, is there anyway to disable it?

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1760375

Title:
  cgroup blkio throttle does not work on root group

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