Re: [PATCH] memcg: do not recalculate section unnecessarily ininit_section_page_cgroup

[KAMEZAWA Hiroyuki]

On Thu, 30 Oct 2008 13:38:50 +0900
Fernando Luis VÃzquez Cao <fernando@xxxxxxxxxxxxx> wrote:

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


> 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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