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

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Date:	Sun, 25 Oct 2009 21:52:25 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Mike Galbraith <efault@....de>
Cc:	Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] sched: Disable affine wakeups by default

On Mon, 26 Oct 2009 05:38:27 +0100
Mike Galbraith <efault@....de> 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.
> 
> Yeah, sounds right, while writing that, it looked kinda ugly.  I
> suppose arch land needs to encode cache property somehow if I really
> want to be able to target cache on multicore.  Booting becomes..
> exciting when I tinker down there.

or we just use SD_WAKE_AFFINE / SD_BALANCE_WAKE for this...



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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