linux-kernel - Re: [RFC PATCH 0/2] sched: simplify the select_task_rq

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Message-ID: <1358752180.4994.65.camel@marge.simpson.net>
Date:	Mon, 21 Jan 2013 08:09:40 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	peterz@...radead.org, mingo@...nel.org, a.p.zijlstra@...llo.nl
Subject: Re: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair()

On Mon, 2013-01-21 at 07:42 +0100, Mike Galbraith wrote: 
> On Mon, 2013-01-21 at 13:07 +0800, Michael Wang wrote:

> > May be we could try change this back to the old way later, after the aim
> > 7 test on my server.
> 
> Yeah, something funny is going on.

Never entering balance path kills the collapse.  Asking wake_affine()
wrt the pull as before, but allowing us to continue should no idle cpu
be found, still collapsed.  So the source of funny behavior is indeed in
balance_path.

-Mike

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