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    SubjectRe: [PATCH 0/9] namespaces: Introduction
    Herbert Poetzl <herbert@13thfloor.at> wrote:
    >
    > let me
    > give a simple example here:

    Examples are useful.

    > "pid virtualization"
    >
    > - Linux-VServer doesn't really need that right now.
    > we are perfectly fine with "pid isolation" here, we
    > only "virtualize" the init pid to make pstree happy
    >
    > - Snapshot/Restart and Migration will require "full"
    > pid virtualization (that's where Eric and OpenVZ
    > are heading towards)

    snapshot/restart/migration worry me. If they require complete
    serialisation of complex kernel data structures then we have a problem,
    because it means that any time anyone changes such a structure they need to
    update (and test) the serialisation.

    This may be a show-stopper, in which case maybe we only need to virtualise
    pid #1.

    > - OpenSSI and *Mosix require system wide pid spaces
    > which probably could be implemented with virtual
    > pid spaces as well
    >
    > - many security addons provide something called pid
    > randomization, and I think they could probably
    > benefit from a virtual pid space, too

    ok.

    Anyway. Thanks, guys. It sound like most of this work will be nicely
    separable so we can think about each bit as it comes along.
    -
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