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    SubjectRe: [ckrm-tech] [PATCH 1/9] Containers (V9): Basic container framework

    [[ I have bcc'd one or more batch scheduler experts on this post.
    They will know who they are, and should be aware that they are
    not listed in the public cc list of this message. - pj ]]

    Balbir Singh, responding to Paul Menage's Container patch set on lkml, wrote:
    > > +*** notify_on_release is disabled in the current patch set. It may be
    > > +*** reactivated in a future patch in a less-intrusive manner
    > > +
    > Won't this break user space tools for cpusets?

    Yes - disabling notify_on_release would definitely break some important
    uses of cpusets. This feature must be reactivated somehow before I'll
    sign up for putting this patch set in the main line.

    Actually, after I posted a few days ago in another lkml post:

    that just the simplest cpuset command:
    mount -t cpuset cpuset /dev/cpuset
    mkdir /dev/cpuset/foo
    echo 0 > /dev/cpuset/foo/mems

    caused an immediate kernel deadlock (Srivatsa has proposed a fix), it
    is pretty clear that this container patch set is not getting the cpuset
    testing it will need for acceptance. That's partly my fault.

    The batch scheduler folks, such as the variants of PBS, LSF and SGE are
    major user of cpusets on NUMA hardware.

    This container based replacement for cpusets isn't ready for the main
    line until at least one of those schedulers can run through one of
    their test suites. I hesitate to even acknowledge this, as I might be
    the only person in a position to make this happen, and my time
    available to contribute to this patch set has been less than I would

    But if it looks like we have all the pieces in place to base cpusets
    on containers, with no known regressions in cpuset capability, then
    we must find a way to ensure that one of these batch schedulers, using
    cpusets on a NUMA box, still works.

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