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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