linux-kernel - Re: [PATCH 04/10] sched, fair: Shrink sg_lb

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Date:	Wed, 21 Aug 2013 10:38:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Mike Galbraith <efault@....de>, Paul Turner <pjt@...gle.com>,
	Alex Shi <alex.shi@...el.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Namhyung Kim <namhyung@...nel.org>,
	Lei Wen <leiwen@...vell.com>, Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH 04/10] sched, fair: Shrink sg_lb_stats and play memset
 games

On Wed, Aug 21, 2013 at 11:20:02AM +0900, Joonsoo Kim wrote:
> > With below change, we can simply do 'offsetof(struct sd_lb_stats, busiest_stat)'.
> > 
> > @@ -4546,7 +4546,7 @@ static bool update_sd_pick_busiest(struct lb_env *env,
> >                                    struct sched_group *sg,
> >                                    struct sg_lb_stats *sgs)
> >  {
> > -       if (sgs->avg_load <= sds->busiest_stat.avg_load)
> > +       if (!sds->busiest && sgs->avg_load <= sds->busiest_stat.avg_load)
> >                 return false;
> >  
> >         if (sgs->sum_nr_running > sgs->group_capacity)
> > 
> 
> Sorry, instead of !sds->busiest, it should be sds->busiest. :)

Of course ;-) However I'm not sure which I prefer.. adding this extra
condition or having the initialization extra tricky. I'll sit on it a
little longer.
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