Subject: cgroups soon incompatible with Libvirt
From: Ben Green <ben@bristolwireless.net>
Date: Mon, 23 Dec 2013 13:17:53 +0000

Hi all,

I got this in my Debian updates today. It relates to libvirt, and its  
use of cgroups:

   If you're using cgroups make sure you're using a different mount per cgroup
   controller (cpu, memory, ...) that is mounted to  
/sys/fs/cgroup/<controller>.
   This can be achieved using mount_cgroups in /etc/default/libvirt-bin or by
   using systemd. Using a single mount point /sys/fs/cgroup for all controllers
   will no longer work and will prevent vms from starting. See

   http://libvirt.org/cgroups.html

   for more information. If you're not using cgroups nothing has to be changed.

Essentially this means that the cgroup structure libvirt will demand  
is different to that which util-vserver demands. This will cause  
trouble for those with mixed environments. Is anything being done  
util-vserver side to adapt to this?

Cheers,
Ben