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

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Message-ID: <20090520103055.GB12433@csn.ul.ie>
Date:	Wed, 20 May 2009 11:30:56 +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>
Subject: Re: [PATCH 2/3] add inactive ratio calculation function of each
	zone

On Wed, May 20, 2009 at 04:19:36PM +0900, Minchan Kim wrote:
> This patch divides setup_per_zone_inactive_ratio with
> per zone inactive ratio calculaton.
> 

Why? I'm guessing it's required by the next patch but a note here
explaining why you need it would be nice.

The new function calculates the inactive ratio for one zone, not all zones,
so a a more appropriate name would have been calculate_zone_inactive_ratio().

Is the indenting for calculate_per_zone_inactive_ratio() in too far? It
looks from the patch that it will be indented one tab too many.

> CC: Rik van Riel <riel@...hat.com>
> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> CC: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> ---
>  include/linux/mm.h |    1 +
>  mm/page_alloc.c    |   14 +++++++++-----
>  2 files changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 1b2cb16..cede957 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_wmark_min(void);
> +extern void calculate_per_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 273526b..4601ba0 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -4552,11 +4552,8 @@ void setup_per_zone_wmark_min(void)
>   *    1TB     101        10GB
>   *   10TB     320        32GB
>   */
> -static void __init setup_per_zone_inactive_ratio(void)
> +void calculate_per_zone_inactive_ratio(struct zone* zone)
>  {
> -	struct zone *zone;
> -
> -	for_each_zone(zone) {
>  		unsigned int gb, ratio;
>  
>  		/* Zone size in gigabytes */
> @@ -4567,7 +4564,14 @@ static void __init setup_per_zone_inactive_ratio(void)
>  			ratio = 1;
>  
>  		zone->inactive_ratio = ratio;
> -	}
> +}
> +
> +static void __init setup_per_zone_inactive_ratio(void)
> +{
> +	struct zone *zone;
> +
> +	for_each_zone(zone) 
> +		calculate_per_zone_inactive_ratio(zone);
>  }
>  
>  /*
> -- 
> 1.5.4.3
> 
> 
> 
> -- 
> Kinds Regards
> Minchan Kim
> 

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