Re: [PATCH linux-cr] nested pid namespaces (v2)

[Matt Helsley]

On Mon, Mar 22, 2010 at 09:38:00AM -0500, Serge E. Hallyn wrote:
> Quoting Louis Rilling (Louis.Rilling@xxxxxxxxxxx):
> > On Fri, Mar 19, 2010 at 04:39:55PM -0500, Serge E. Hallyn wrote:
> > > Support checkpoint and restart of tasks in nested pid namespaces.  At

<snip>

> > It would probably be safer too to use task_active_pid_ns() instead of
> > task->nsproxy->pid_ns, just in case some PID namespace unsharing like proposed
> > by Eric makes it to mainline.
> 
> The task is frozen though so it shouldn't be able to unshare while being
> checkpointed, right?  But it's probably better code anyway.

By the time it reaches checkpoint a frozen task is in the refrigerator
-- most often in the signal delivery portion of syscall return. So it can't
be making any new unshare/setns syscalls and any changes to the namespaces
should be visible.

Cheers,
	-Matt Helsley
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