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    SubjectRe: [patch] HT scheduler, sched-2.5.68-B2
    > Sorry if I misunderstand, but if HT is present, I would think that you
    > would want to start the child of a fork on the same runqueue, because the
    > cache is loaded, and to run the child first because in many cases the
    > child will do and exac. At that point it is probable that the exec'd
    > process run on another CPU would leave the cache useful to the parent.
    > I fully admit that this is "seems to me" rather than measured, but
    > protecting the cache is certainly a good thing in general.

    We don't do balance on exec for SMP. I think we should ;-)
    AFAIK, fork always stays on the same runqueue anyway.

    >> The key is that we want to agressively steal when
    >> nr_active(remote) - nr_active(idle) > 1 ... not > 0.
    >> This will implicitly *never* happen on non HT machines, so it seems
    >> like a nice algorithm ... ?
    > Is it really that simple?

    Well, *I* think so (obviously) ;-)
    Feel free to poke holes in the argument ...


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      Last update: 2005-03-22 13:35    [W:0.019 / U:113.964 seconds]
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