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    SubjectRe: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem
    Quoting Srivatsa Vaddagiri (vatsa@in.ibm.com):
    > On Mon, Feb 12, 2007 at 12:15:28AM -0800, menage@google.com wrote:
    > > +int ns_container_clone(struct task_struct *tsk)
    > > +{
    > > + return container_clone(tsk, &ns_subsys);
    > > +}
    >
    > This function is a no-op if ns hierarchy is not mounted at this point.
    > This would mean that we will miss out on some directories in ns
    > hierarchy if it happened to be mounted later. It would be nice to
    > recreate such missing directories upon mount. However I suspect it would
    > not be easy ..Maybe we need to scan the task list and (re-)invoke
    > ns_container_clone() for every new tsk->nsproxy we find in the list.
    > Alternately perhaps we could auto mount (kern_mount) ns hierarchy very early at
    > bootup? On the flip side that would require remount support so that additional
    > controllers (like cpuset, mem) can be bound to (non-empty) ns hierarchy after
    > bootup.

    Losing the directory isn't a big deal though. And both unsharing a
    namespace (which causes a ns_container_clone) and mounting the hierarchy
    are done by userspace, so if for some installation it is a big deal,
    the init scripts on initrd can mount the hierarchy before doing any
    unsharing.

    Can you think of a reason why losing a few directories matters?

    -serge
    -
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