linux-kernel - Re: [RESEND PATCH V5 0/8] remove cpu

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Message-ID: <20140429150430.GI2639@e103034-lin>
Date:	Tue, 29 Apr 2014 16:04:30 +0100
From:	Morten Rasmussen <morten.rasmussen@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alex Shi <alex.shi@...aro.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"efault@....de" <efault@....de>,
	"wangyun@...ux.vnet.ibm.com" <wangyun@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mgorman@...e.de" <mgorman@...e.de>
Subject: Re: [RESEND PATCH V5 0/8] remove cpu_load idx

On Thu, Apr 24, 2014 at 05:20:29PM +0100, Peter Zijlstra wrote:
> OK, this series is a lot saner, with the exception of 3/8 and
> dependents.
> 
> I do still worry a bit for loosing the longer term view for the big
> domains though. Sadly I don't have any really big machines.
> 
> I think the entire series is equivalent to setting LB_BIAS to false. So
> I suppose we could do that for a while and if nobody reports horrible
> things we could just do this.
> 
> Anybody?

I can't say what will happen on big machines, but I think the LB_BIAS
test could be a way to see what happens. I'm not convinced that it won't
lead to more task migrations since we will use the instantaneous cpu
load (weighted_cpuload()) unfiltered.

Morten
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