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    SubjectRe: [RFC][PATCH v5 00/14] sched: packing tasks
    On 11/11/2013 05:36 PM, Peter Zijlstra wrote:
    > On Mon, Nov 11, 2013 at 11:33:45AM +0000, Catalin Marinas wrote:
    >
    > tl;dr :-) Still trying to wrap my head around how to do that weird
    > topology Vincent raised..
    >
    >> Question for Peter/Ingo: do you want the scheduler to decide on which
    >> C-state a CPU should be in or we still leave this to a cpuidle
    >> layer/driver?
    >
    > I think the can leave most of that in a driver; right along with how to
    > prod the hardware to actually get into that state.
    >
    > I think the most important parts are what is now 'generic' code; stuff
    > that guestimates the idle-time and so forth.
    >
    > I think the scheduler simply wants to say: we expect to go idle for X
    > ns, we want a guaranteed wakeup latency of Y ns -- go do your thing.

    Hi Peter,

    IIUC, for full integration in the scheduler, we should eradicate the
    idle task and the related code tied with it, no ?

    > I think you also raised the point in that we do want some feedback as to
    > the cost of waking up particular cores to better make decisions on which
    > to wake. That is indeed so.
    > --
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