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    SubjectRe: [RFC PATCH 2/3] sched: add yield_to function
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    On Fri, 2010-12-03 at 09:48 -0500, Rik van Riel wrote:
    > On 12/03/2010 09:45 AM, Mike Galbraith wrote:
    >
    > > I'll have to go back and re-read that. Off the top of my head, I see no
    > > way it could matter which container the numbers live in as long as they
    > > keep advancing, and stay in the same runqueue. (hm, task weights would
    > > have to be the same too or scaled. dangerous business, tinkering with
    > > vruntimes)
    >
    > They're not necessarily in the same runqueue, the
    > VCPU that is given time might be on another CPU
    > than the one that was spinning on a lock.

    I don't think pumping vruntime cross cfs_rq would be safe, for the
    reason noted (et al). No competition means vruntime is meaningless.
    Donating just advances a clock that nobody's looking at.

    -Mike



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