linux-kernel - Re: [PATCH v2 2/3] sched: factor out code to should_we

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Date:	Mon, 5 Aug 2013 16:21:44 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	'Ingo Molnar' <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	'Mike Galbraith' <efault@....de>,
	'Paul Turner' <pjt@...gle.com>,
	'Alex Shi' <alex.shi@...el.com>,
	'Vincent Guittot' <vincent.guittot@...aro.org>,
	'Morten Rasmussen' <morten.rasmussen@....com>,
	'Namhyung Kim' <namhyung@...nel.org>
Subject: Re: [PATCH v2 2/3] sched: factor out code to should_we_balance()

On Mon, Aug 05, 2013 at 09:52:28AM +0530, Preeti U Murthy wrote:
> On 08/02/2013 04:02 PM, Peter Zijlstra wrote:
> > On Fri, Aug 02, 2013 at 02:56:14PM +0530, Preeti U Murthy wrote:
> >>>> You need to iterate over all the groups of the sched domain env->sd and
> >>>> not just the first group of env->sd like you are doing above. This is to
> >>>
> >>> I don't think so.
> >>> IIRC, env->sd->groups always means local group,
> >>> so we don't need to find our group by iterating over all the groups.
> >>
> >> Take a look at update_sd_lb_stats(). That should clarify this. There is
> >> an exclusive
> >> local_group check there.
> >>
> >> sd->groups points to the first group in the list of groups under this sd.
> > 
> > Take a look at: 88b8dac0a
> > 
> Ah ok! Thanks for this pointer.
> 
> Apologies for having overlooked the fact that the sd->groups always
> points to the group to which the balance_cpu belongs. And subsequent
> dst_cpus for retries of load balancing also belong to the same group as
> the balance_cpu.
> 
> This patch thus looks fine to me.

Okay!

> 
> Regards
> Preeti U Murthy
> 
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