linux-kernel - Re: [PATCH 2/3] add inactive ratio calculation function of each zone V2

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Date:	Mon, 25 May 2009 10:00:41 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Yasunori Goto <y-goto@...fujitsu.com>
Subject: Re: [PATCH 2/3] add inactive ratio calculation function of each
	zone V2

On Thu, May 21, 2009 at 09:23:21AM +0900, Minchan Kim wrote:
> Changelog since V1 
>  o Change function name from calculate_zone_inactive_ratio to calculate_inactive_ratio
>    - by Mel Gorman advise
>  o Modify tab indent - by Mel Gorman advise
> 
> This patch devide setup_per_zone_inactive_ratio with
> per-zone inactive ratio calculaton.
> 
> This patch is just for helping my next patch.
> (reset wmark_min and inactive ratio of zone when hotplug happens)
> 
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

Reviewed-by: Mel Gorman <mel@....ul.ie>

> CC: Rik van Riel <riel@...hat.com>
> CC: Johannes Weiner <hannes@...xchg.org>
> ---
>  include/linux/mm.h |    1 +
>  mm/page_alloc.c    |   28 ++++++++++++++++------------
>  2 files changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 7ea4d1b..5d7a835 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1059,6 +1059,7 @@ extern void set_dma_reserve(unsigned long new_dma_reserve);
>  extern void memmap_init_zone(unsigned long, int, unsigned long,
>  				unsigned long, enum memmap_context);
>  extern void setup_per_zone_wmarks(void);
> +extern void calculate_zone_inactive_ratio(struct zone *zone);
>  extern void mem_init(void);
>  extern void __init mmap_init(void);
>  extern void show_mem(void);
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index b518ea7..f11cfbf 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -4553,22 +4553,26 @@ void setup_per_zone_wmarks(void)
>   *    1TB     101        10GB
>   *   10TB     320        32GB
>   */
> -static void __init setup_per_zone_inactive_ratio(void)
> +void calculate_zone_inactive_ratio(struct zone *zone)
>  {
> -	struct zone *zone;
> +	unsigned int gb, ratio;
>  
> -	for_each_zone(zone) {
> -		unsigned int gb, ratio;
> +	/* Zone size in gigabytes */
> +	gb = zone->present_pages >> (30 - PAGE_SHIFT);
> +	if (gb)
> +		ratio = int_sqrt(10 * gb);
> +	else
> +		ratio = 1;
>  
> -		/* Zone size in gigabytes */
> -		gb = zone->present_pages >> (30 - PAGE_SHIFT);
> -		if (gb)
> -			ratio = int_sqrt(10 * gb);
> -		else
> -			ratio = 1;
> +	zone->inactive_ratio = ratio;
> +}
>  
> -		zone->inactive_ratio = ratio;
> -	}
> +static void __init setup_per_zone_inactive_ratio(void)
> +{
> +	struct zone *zone;
> +
> +	for_each_zone(zone)
> +		calculate_zone_inactive_ratio(zone);	
>  }
>  
>  /*
> -- 
> 1.5.4.3
> 

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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