Re: [RFC PATCH v3 0/3] sched: simplify the select_task_rq_fair()

From: Mike Galbraith
Date: Fri Feb 22 2013 - 03:33:05 EST

On Fri, 2013-02-22 at 14:42 +0800, Michael Wang wrote:

> So this is trying to take care the condition when curr_cpu(local) and
> prev_cpu(remote) are on different nodes, which in the old world,
> wake_affine() won't be invoked, correct?

It'll be called any time this_cpu and prev_cpu aren't one and the same.
It'd be pretty silly to asking whether to pull_here or leave_there when
here and there are identical.

> Hmm...I think this maybe a good additional checking before enter balance
> path, but I could not estimate the cost to record the relationship at
> this moment of time...

It'd be pretty cheap, but I'd hate adding any cycles to the fast path
unless those cycles have one hell of a good payoff, so the caching would
have to show most excellent cold hard numbers (talk crazy ideas walk;).


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