linux-kernel - Re: [PATCH 3/3] sched: Disable affine wakeups by default

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Message-Id: <1256714741.10387.4.camel@marge.simson.net>
Date:	Wed, 28 Oct 2009 08:25:41 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Arjan van de Ven <arjan@...radead.org>, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] sched: Disable affine wakeups by default

On Tue, 2009-10-27 at 15:35 +0100, Mike Galbraith wrote:
> On Mon, 2009-10-26 at 02:53 +0100, Peter Zijlstra wrote:
> > On Sun, 2009-10-25 at 23:04 +0100, Mike Galbraith wrote:
> > >                 if (want_affine && (tmp->flags & SD_WAKE_AFFINE) &&
> > > -                   cpumask_test_cpu(prev_cpu, sched_domain_span(tmp))) {
> > > +                               (level == SD_LV_SIBLING || level == SD_LV_MC)) {
> > 
> > quick comment without actually having looked at the patch, we should
> > really get rid of sd->level and encode properties of the sched domains
> > in sd->flags.
> 
> I used SD_PREFER_SIBLING in the below.  Did I break anything?

Um, other than taskset.

> +				if (candidate == -1 || candidate == cpu) {
> +					for_each_cpu(i, sched_domain_span(tmp)) {

                                                if (!cpumask_test_cpu(i, &p->cpus_allowed))
                                                        continue;

(i think i'm going to need that domain flag in a few minutes anyway)

	-Mike

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