Re: [PATCH 5/5] sched/rt: Optimize find_lowest_rq() to select a cache hot cpu

[Steven Rostedt]

On Tue, 27 Jan 2015 15:21:36 +0100
Peter Zijlstra <peterz@xxxxxxxxxxxxx> 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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