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    SubjectRe: [PATCH 0/18] Basic scheduler support for automatic NUMA balancing V5
    On Wed, Jul 31, 2013 at 06:39:03PM +0200, Peter Zijlstra wrote:
    > On Wed, Jul 31, 2013 at 05:11:41PM +0100, Mel Gorman wrote:
    > > RSS was another option it felt as arbitrary as a plain delay.
    >
    > Right, it would avoid 'small' programs getting scanning done with the
    > rationale that their cost isn't that large since they don't have much
    > memory to begin with.
    >

    Yeah, but it's not necessarily true. Whatever value we pick there can be
    an openmp process that fits in there.

    > The same can be said for tasks that don't run much -- irrespective of
    > how much absolute runtime they've gathered.
    >
    > Is there any other group of tasks that we do not want to scan?
    >

    strcmp(p->comm, ....)


    > Maybe if we can list all the various exclusions we can get to a proper
    > quantifier that way.
    >
    > So far we've got:
    >
    > - doesn't run long
    > - doesn't run much
    > - doesn't have much memory
    >

    - does not have sysV shm sections

    > > Should I revert 5bca23035391928c4c7301835accca3551b96cc2 with an
    > > explanation that it potentially is completely useless in the purely
    > > multi-process shared case?
    >
    > Yeah I suppose so..

    Will do.

    --
    Mel Gorman
    SUSE Labs


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