[lxc-devel] lxc0.8 and hierarchies

[William Dauchy]

Hi Serge,

Thanks for your quick reply.

On Wed, May 2, 2012 at 4:14 PM, Serge Hallyn <serge.hallyn at canonical.com> wrote:
> The issue of what to do with control groups which do not support
> hierarchies has been discussed on lkml recently.  I thought (though
> maybe I'm wrong) the decision was that such a subsystem would have
> its cgroups available at leaf nodes, i.e. it's /xyz cgroup, if
> composed with a devices cgroup which has /abc/xyz, would be
> visible at /abc/xyz.  IIRC one of the primary drivers of the need
> for this was systemd support.
>
> Putting lxc cgroups under lxc/ is the right thing to do to cooperate
> with other programs using cgroups, like libvirt.  I don't think we
> should punt on that.  Rather, I personally think it's reasonable to say
> that if you are using a cgroup which has max depth 1, you should mount
> it separately.  If you then want to use it with lxc, perhaps we should,
> for now have a hack which specifis which cgroups do not support
> hierarchies, and handle them specially?

I guess you were talking about this thread https://lkml.org/lkml/2012/2/21/379
Thanks for the explanation. It's quite clear and could be useful for
users asking them self the same question.
-- 
William