linux-kernel - Re: [PATCH 2/2] sched: add statistic for rq->max_idle_balance

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Date:	Wed, 22 Jan 2014 10:10:08 -0800
From:	Jason Low <jason.low2@...com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alex Shi <alex.shi@...aro.org>, Ingo Molnar <mingo@...hat.com>,
	morten.rasmussen@....com, vincent.guittot@...aro.org,
	daniel.lezcano@...aro.org, Mike Galbraith <efault@....de>,
	wangyun@...ux.vnet.ibm.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] sched: add statistic for rq->max_idle_balance_cost

On Wed, 2014-01-22 at 17:09 +0100, Peter Zijlstra wrote:
> On Wed, Jan 22, 2014 at 04:24:13PM +0800, Alex Shi wrote:
> > From: Alex Shi <alex.shi@...aro.org>
> > Date: Tue, 21 Jan 2014 13:28:55 +0800
> > Subject: [RFC PATCH] sched: add statistic for rq->max_idle_balance_cost
> > 
> > It's useful to track this value in debug mode.
> > 
> > Signed-off-by: Alex Shi <alex.shi@...aro.org>
> > ---
> >  kernel/sched/debug.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
> > index 1e43e70..f5c529a 100644
> > --- a/kernel/sched/debug.c
> > +++ b/kernel/sched/debug.c
> > @@ -315,6 +315,7 @@ do {									\
> >  	P(sched_goidle);
> >  #ifdef CONFIG_SMP
> >  	P64(avg_idle);
> > +	P64(max_idle_balance_cost);
> >  #endif
> >   	P(ttwu_count);
> 
> Not also the per-sd value in sd_alloc_ctl_domain_table() ?

Yeah, tracking the sd->max_newidle_lb_cost can also be useful.


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