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

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Message-ID: <1399011219.5233.55.camel@marge.simpson.net>
Date:	Fri, 02 May 2014 08:13:39 +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:

> Whether or not this is the right thing to do remains to be seen,
> but it does allow us to verify whether or not the wake_affine
> strategy of always doing affine wakeups and only disabling them
> in a specific circumstance is sound, or needs rethinking...

Yes, it needs rethinking.

I know why you want to try this, yes, select_idle_sibling() is very much
a two faced little bitch.  NOHZ doesn't help, my kernels throttle it.

-Mike


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