linux-kernel - Re: [patch] sched: fix sd_parent_degenerate on non-numa smp machine

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Message-ID: <20081208125319.GD16560@elte.hu>
Date:	Mon, 8 Dec 2008 13:53:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ken Chen <kenchen@...gle.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch] sched: fix sd_parent_degenerate on non-numa smp machine


* Ken Chen <kenchen@...gle.com> wrote:

> The addition of SD_SERIALIZE flag added to SD_NODE_INIT prevented top level
> dummy numa sched_domain to be properly degenerated on non-numa smp machine.
> The reason is that in sd_parent_degenerate(), it found that the child and
> parent does not have comon sched_domain flags due to SD_SERIALIZE.  However,
> for non-numa smp box, the top level is a dummy with a single sched_group.
> 
> Filter out SD_SERIALIZE if it is on non-numa machine to properly degenerate
> top level node sched_domain.  this will cut back some of the sd domain walk
> in the load balancer code.
> 
> Signed-off-by: Ken Chen <kenchen@...gle.com>

applied to tip/sched/core, thanks Ken!

	Ingo
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