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    SubjectRe: [ckrm-tech] [PATCH 00/10] Containers(V10): Generic Process Containers
    > I suppose as a cleaner alternative we could 
    > add a container_subsys->inherit_defaults() handler, to be called at
    > container_clone(), and for cpusets this would set cpus and mems to
    > the parent values - sibling exclusive values. If that comes to nothing,
    > then the attach_task() is still refused, and the unshare() or clone()
    > fails, but this time with good reason.

    Unfortunately, I haven't spent the time I should thinking about
    container cloning, namespaces and such.

    I don't know, for the workloads that matter to me, when, how or
    if this container cloning will be used.

    I'm tempted to suggest the following.

    First, I am assuming that the classic method of creating cpuset
    children will still work, such as the following (which can fail
    for certain combinations of exclusive cpus or mems):
    cd /dev/cpuset/foobar
    mkdir foochild
    cp cpus foochild
    cp mems foochild
    echo $$ > foochild/tasks

    Second, given that, how about you fail the unshare() or clone()
    anytime that the instance to be cloned has any sibling cpusets
    with any exclusive flags set.

    The exclusive property is not really on friendly terms with cloning.

    Now if the above classic code must be encoded using cloning under
    the covers, then we've got problems, probably more problems than
    just this.

    --
    I won't rest till it's the best ...
    Programmer, Linux Scalability
    Paul Jackson <pj@sgi.com> 1.925.600.0401
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