Re: [PATCH 0/3][V2] remove the ns_cgroup

[Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>]

On Mon, 27 Sep 2010 15:36:58 -0500
"Serge E. Hallyn" <serge.hallyn-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> wrote:

> > > This patchset removes the ns_cgroup by adding a new flag to the cgroup
> > > and the cgroupfs mount option. It enables the copy of the parent cgroup
> > > when a child cgroup is created. We can then safely remove the ns_cgroup as
> > > this flag brings a compatibility. We have now to manually create and add the
> > > task to a cgroup, which is consistent with the cgroup framework.
> > 
> > So this is a non-backward-compatible userspace-visible change?
> 
> Yes, it is.
> 
> Patch 1 is needed to let lxc and libvirt both control containers with
> same cgroup setup.  Patch 3 however isn't *necessary* for that.  Daniel,
> what do you think about holding off on patch 3?

One way of handling this would be to merge patches 1&2 which add the
new interface and also arrange for usage of the old interface(s) to
emit a printk, telling people that they're using a feature which is
scheduled for removal.

Later, we remove the old interface.