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    SubjectRe: [PATCH 0/9] namespaces: Introduction
    On Sun, May 21, 2006 at 05:18:50PM -0600, Eric W. Biederman wrote:
    > Pavel Machek <pavel@ucw.cz> writes:
    >
    > > Well, if pid #1 virtualization is only needed for pstree, we may want
    > > to fix pstree instead :-).

    yes, actually this and init itself (which uses the
    pid to switch between init and telinit behaviour)
    are the only two applications we found so far ...

    and as far as I know, those work with non pid=1
    values on other operating systems (inside containers)

    a fix there would definitely be appreciated and
    I think it would not hurt normal behaviour ...

    > One thing that is not clear is if isolation by permission checks is
    > any easier to implement than isolation with a namespace.

    for the pid space, I'm not really sure if isolation
    is really cheaper than virtualization, but for the
    network space for example, a virtualization solution
    which is as lightweigth as the isolation is probably
    more challenging, although not impossible ...

    > Isolation at permission checks may actually be more expensive in terms
    > of execution time, and maintenance.

    again, for the pid space, maintenance is quite low ..

    best,
    Herbert

    > Eric
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