Quoting Eric W. Biederman (ebiederm@xmission.com):
> Cedric Le Goater <clg@fr.ibm.com> writes:
> 
> >>> what about a kthread that would be spawned when a task is cloned in an 
> >>> unshared pid namespace ? This is an extra cost in term of tasks.
> >> 
> >> If you use kernel_thread this can happen. (Die kernel_thread).
> >> If you use the kthread interface keventd will be the parent process and
> >> we won't have problems.  
> >
> > so is it something acceptable for mainline ? I think openvz has such
> > a thread doing the reaping.
> 
> Please clarify.  Is what acceptable for mainline?

I think Cedric is thinking about a per-pidnamespace reaper thread.

I think you and I are just thinking of walking a list of all the
processes with a pid in the namespace, and killing each.

-serge
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