[Bug 1392176] Re: mounts cgroups unconditionally which causes undesired effects with cpu hotplug

[Martin Pitt]

systemd (in the sense of pid 1) doesn't do that. I. e. if you boot with
init=/bin/systemd the only cgroup controller it puts tasks into (by
default) is the "systemd" one, for that very reason. But if you boot
with upstart (Ubuntu's default still), cgmanager creates cgroups.
cgmanager puts tasks into *all* controllers (including "cpu"); as far as
I know, this is so that user LXC containers work. So from cgmanager's
POV this might be a design decision which can't otherwise be
accomplished with the current kernel, but I'll let the cgmanager
maintainers decide about whether this is a "wontfix" or whether there is
a more elegant way to make user containers work.

** Summary changed:

- Systemd mounts cgroups unconditionally which causes undesired effects with cpu hotplug
+ mounts cgroups unconditionally which causes undesired effects with cpu hotplug

** Package changed: systemd (Ubuntu) => cgmanager (Ubuntu)

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https://bugs.launchpad.net/bugs/1392176

Title:
  mounts cgroups unconditionally which causes undesired effects with cpu
  hotplug

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