linux-kernel - Re: [PATCH 14/15] sched: Conditionally limit __cpu_power when child sched domain has type NODE

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Message-Id: <1251128132.7538.300.camel@twins>
Date:	Mon, 24 Aug 2009 17:35:32 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andreas Herrmann <andreas.herrmann3@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/15] sched: Conditionally limit __cpu_power when
 child sched domain has type NODE

On Thu, 2009-08-20 at 15:45 +0200, Andreas Herrmann wrote:
> We need this in case of performance policy. All sched_groups in
> child's parent domain (MN in this case) should be limited such that
> tasks are balanced among these sched_groups.

/me fails at correlating the above changelog and the below patch.

So here we go mess up cpu_power again in order to invluence the
placement policy?

> Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
> ---
>  kernel/sched.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 0c950dc..ab88d88 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -8555,11 +8555,11 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd)
>  	 */
>  	if (!(sd->flags & SD_POWERSAVINGS_BALANCE) &&
>  	    ((child->flags &
> -	      (SD_SHARE_CPUPOWER | SD_SHARE_PKG_RESOURCES)))) {
> +	      (SD_SHARE_CPUPOWER | SD_SHARE_PKG_RESOURCES)) ||
> +	     (child->level == SD_LV_NODE))) {
>  		sd->groups->__cpu_power = 0;
>  		sg_inc_cpu_power(sd->groups, SCHED_LOAD_SCALE);
>  	}
> -
>  }
>  
>  /*
--
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