linux-kernel - Re: [PATCH] memcg: do not recalculate section unnecessarily in init_section_page

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Message-Id: <20081030154532.ad97ec93.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 30 Oct 2008 15:45:32 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memcg: do not recalculate section unnecessarily in
 init_section_page_cgroup

On Thu, 30 Oct 2008 13:38:50 +0900
Fernando Luis Vázquez Cao <fernando@....ntt.co.jp> wrote:

> Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
> ---
> 
Thanks, but please add patch description "what this patch fixes".
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


> diff -urNp linux-2.6.28-rc2-mm1-orig/mm/page_cgroup.c linux-2.6.28-rc2-mm1/mm/page_cgroup.c
> --- linux-2.6.28-rc2-mm1-orig/mm/page_cgroup.c	2008-10-30 12:49:27.000000000 +0900
> +++ linux-2.6.28-rc2-mm1/mm/page_cgroup.c	2008-10-30 12:52:41.000000000 +0900
> @@ -99,13 +99,11 @@ struct page_cgroup *lookup_page_cgroup(s
>  
>  int __meminit init_section_page_cgroup(unsigned long pfn)
>  {
> -	struct mem_section *section;
> +	struct mem_section *section = __pfn_to_section(pfn);
>  	struct page_cgroup *base, *pc;
>  	unsigned long table_size;
>  	int nid, index;
>  
> -	section = __pfn_to_section(pfn);
> -
>  	if (section->page_cgroup)
>  		return 0;
>  
> @@ -131,7 +129,6 @@ int __meminit init_section_page_cgroup(u
>  		__init_page_cgroup(pc, pfn + index);
>  	}
>  
> -	section = __pfn_to_section(pfn);
>  	section->page_cgroup = base - pfn;
>  	total_usage += table_size;
>  	return 0;
> 
> 
> 

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