Re: [PATCH 2/2] sched: add statistic for rq->max_idle_balance_cost

[Jason Low]

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@xxxxxxxxxx>
> > 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@xxxxxxxxxx>
> > ---
> >  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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