[pkg-lxc-devel] Bug#824519: Bug#824519: lxc: After CPU hotplug, cores remain idle under LXC

[Serge Hallyn]

Yup, this is a known shortcoming of cpusets in the legacy hierarchy.  If you
use the unified hierarchy, the cores can be automatically re-inserted when
they come back up, however the unified hierarchy brings other problems which
we're not entirely ready to deal with yet.

For now, if you do a lot of hotplugging, you'll either need to not use
the cpuset controller (use lxc.cgroup.use to control this), or you can
use an external daemon to continually re-balance the containers among
cpus, as lxd does.