linux-kernel - Re: [PATCH 1/3] clean up setup_per_zone_pages

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Message-ID: <20090520085416.GA27056@csn.ul.ie>
Date:	Wed, 20 May 2009 09:54:16 +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 1/3] clean up setup_per_zone_pages_min

On Wed, May 20, 2009 at 04:18:53PM +0900, Minchan Kim wrote:
> 
> Mel changed zone->pages_[high/low/min] with zone->watermark array.
> So, setup_per_zone_pages_min also have to be changed.
> 

Just to be clear, this is a function renaming to match the new zone
field name, not something I missed. As the function changes min, low and
max, a better name might have been setup_per_zone_watermarks but whether
you go with that name or not, this is better than what is there so;

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

> CC: Mel Gorman <mel@....ul.ie>
> Signed-off-by: Minchan kim <minchan.kim@...il.com>
> ---
>  include/linux/mm.h  |    2 +-
>  mm/memory_hotplug.c |    2 +-
>  mm/page_alloc.c     |   14 +++++++-------
>  3 files changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index a569862..1b2cb16 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1058,7 +1058,7 @@ extern int __meminit __early_pfn_to_nid(unsigned long pfn);
>  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_pages_min(void);
> +extern void setup_per_zone_wmark_min(void);
>  extern void mem_init(void);
>  extern void __init mmap_init(void);
>  extern void show_mem(void);
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index c083cf5..40bf385 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -422,7 +422,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
>  	zone->present_pages += onlined_pages;
>  	zone->zone_pgdat->node_present_pages += onlined_pages;
>  
> -	setup_per_zone_pages_min();
> +	setup_per_zone_wmark_min();
>  	if (onlined_pages) {
>  		kswapd_run(zone_to_nid(zone));
>  		node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 9c712f0..273526b 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -4471,12 +4471,12 @@ static void setup_per_zone_lowmem_reserve(void)
>  }
>  
>  /**
> - * setup_per_zone_pages_min - called when min_free_kbytes changes.
> + * setup_per_zone_wmark_min - called when min_free_kbytes changes.
>   *
> - * Ensures that the pages_{min,low,high} values for each zone are set correctly
> + * Ensures that the watermark[min,low,high] values for each zone are set correctly
>   * with respect to min_free_kbytes.
>   */
> -void setup_per_zone_pages_min(void)
> +void setup_per_zone_wmark_min(void)
>  {
>  	unsigned long pages_min = min_free_kbytes >> (PAGE_SHIFT - 10);
>  	unsigned long lowmem_pages = 0;
> @@ -4594,7 +4594,7 @@ static void __init setup_per_zone_inactive_ratio(void)
>   * 8192MB:	11584k
>   * 16384MB:	16384k
>   */
> -static int __init init_per_zone_pages_min(void)
> +static int __init init_per_zone_wmark_min(void)
>  {
>  	unsigned long lowmem_kbytes;
>  
> @@ -4605,12 +4605,12 @@ static int __init init_per_zone_pages_min(void)
>  		min_free_kbytes = 128;
>  	if (min_free_kbytes > 65536)
>  		min_free_kbytes = 65536;
> -	setup_per_zone_pages_min();
> +	setup_per_zone_wmark_min();
>  	setup_per_zone_lowmem_reserve();
>  	setup_per_zone_inactive_ratio();
>  	return 0;
>  }
> -module_init(init_per_zone_pages_min)
> +module_init(init_per_zone_wmark_min)
>  
>  /*
>   * min_free_kbytes_sysctl_handler - just a wrapper around proc_dointvec() so 
> @@ -4622,7 +4622,7 @@ int min_free_kbytes_sysctl_handler(ctl_table *table, int write,
>  {
>  	proc_dointvec(table, write, file, buffer, length, ppos);
>  	if (write)
> -		setup_per_zone_pages_min();
> +		setup_per_zone_wmark_min();
>  	return 0;
>  }
>  

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