Re: [PATCH -mmotm-2009-12-10-17-19] Prevent churning of zero page in LRU list.

[KOSAKI Motohiro]

> 
> VM doesn't add zero page to LRU list. 
> It means zero page's churning in LRU list is pointless. 
> 
> As a matter of fact, zero page can't be promoted by mark_page_accessed
> since it doesn't have PG_lru. 
> 
> This patch prevent unecessary mark_page_accessed call of zero page 
> alghouth caller want FOLL_TOUCH. 
> 
> Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>

Looks good to me.
	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>



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