linux-kernel - Re: [PATCH RESEND] sched: prefer an idle cpu vs an idle sibling for BALANCE

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Date:	Thu, 28 May 2015 13:49:39 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Morten Rasmussen <morten.rasmussen@....com>
Cc:	Josef Bacik <jbacik@...com>, "riel@...hat.com" <riel@...hat.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND] sched: prefer an idle cpu vs an idle sibling for
 BALANCE_WAKE

On Thu, 2015-05-28 at 12:48 +0100, Morten Rasmussen wrote:
> On Thu, May 28, 2015 at 11:57:44AM +0100, Mike Galbraith wrote:
> > On Thu, 2015-05-28 at 10:49 +0100, Morten Rasmussen wrote:
> > 
> > > Isn't sd == NULL is most cases if you don't move the sd assignment
> > > before the affine_sd assignment?
> > 
> > sd will usually be NULL regardless of where the assignment is, as
> > SD_BALANCE_WAKE is usually off in ->flags.  Josef is turning it on.
> 
> Right. SD_BALANCE_WAKE needs to set in the sd flags and the assignment
> has to happen before the break for this to work. I just don't see
> SD_BALANCE_WAKE being enabled for the sched_domain anywhere in the
> patch?

He's doing that via proc interface.. well, I presume he is anyway.

	-Mike

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