linux-kernel - Re: [PATCH RFC/TEST] sched: make sync affine wakeups work

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Message-ID: <1399008721.5233.35.camel@marge.simpson.net>
Date:	Fri, 02 May 2014 07:32:01 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, morten.rasmussen@....com,
	mingo@...nel.org, peterz@...radead.org,
	george.mccollister@...il.com, ktkhai@...allels.com
Subject: Re: [PATCH RFC/TEST] sched: make sync affine wakeups work

On Fri, 2014-05-02 at 00:42 -0400, Rik van Riel wrote: 
> Currently sync wakeups from the wake_affine code cannot work as
> designed, because the task doing the sync wakeup from the target
> cpu will block its wakee from selecting that cpu.
> 
> This is despite the fact that whether or not the wakeup is sync
> determines whether or not we want to do an affine wakeup...

If the sync hint really did mean we ARE going to schedule RSN, waking
local would be a good thing.  It is all too often a big fat lie.

-Mike

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