linux-kernel - Re: [PATCH v4 09/12] sched/numa: fix period

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Date:	Tue, 10 Dec 2013 15:37:27 -0500
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v4 09/12] sched/numa: fix period_slot recalculation

On Tue, Dec 10, 2013 at 05:19:32PM +0800, Wanpeng Li wrote:
> Changelog:
>  v3 -> v4:
>   * remove period_slot recalculation
> 
> The original code is as intended and was meant to scale the difference
> between the NUMA_PERIOD_THRESHOLD and local/remote ratio when adjusting
> the scan period. The period_slot recalculation can be dropped.
> 
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

Thanks,
Naoya

> ---
>  kernel/sched/fair.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 7073c76..90b9b88 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -1356,7 +1356,6 @@ static void update_task_scan_period(struct task_struct *p,
>  		 * scanning faster if shared accesses dominate as it may
>  		 * simply bounce migrations uselessly
>  		 */
> -		period_slot = DIV_ROUND_UP(diff, NUMA_PERIOD_SLOTS);
>  		ratio = DIV_ROUND_UP(private * NUMA_PERIOD_SLOTS, (private + shared));
>  		diff = (diff * ratio) / NUMA_PERIOD_SLOTS;
>  	}
> -- 
> 1.7.7.6
> 
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