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    SubjectRe: [PATCH 5/5] sched/rt: Optimize find_lowest_rq() to select a cache hot cpu
    On Tue, 27 Jan 2015 15:21:36 +0100
    Peter Zijlstra <peterz@infradead.org> wrote:

    > On Mon, Jan 19, 2015 at 04:49:40AM +0000, Xunlei Pang wrote:
    > > In find_lowest_rq(), if we can't find a wake_affine cpu from
    > > sched_domain, then we can actually determine a cache hot cpu
    > > instead of simply calling "cpumask_any(lowest_mask)" which
    > > always returns the first cpu in the mask.
    > >
    > > So, we can determine the cache hot cpu during the interation of
    > > sched_domain() in passing.
    >
    > Steve, I'm not getting this. Why are we using WAKE_AFFINE here?
    >

    It originated from Gregory Haskins topology patches. See
    6e1254d2c41215da27025add8900ed187bca121d

    -- Steve


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