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

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Message-ID: <20140122160901.GW13532@twins.programming.kicks-ass.net>
Date:	Wed, 22 Jan 2014 17:09:01 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alex Shi <alex.shi@...aro.org>
Cc:	Jason Low <jason.low2@...com>, 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, 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() ?

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