linux-kernel - Re: [PATCH 1/3 v2] mm: Batch unmapping of file mapped pages in shrink_page

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Date:	Wed, 12 Sep 2012 12:28:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Mel Gorman <mel@....ul.ie>, Minchan Kim <minchan@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>, linux-mm@...ck.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alex Shi <alex.shi@...el.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH 1/3 v2] mm: Batch unmapping of file mapped pages in
 shrink_page_list

On Mon, 10 Sep 2012 09:19:25 -0700
Tim Chen <tim.c.chen@...ux.intel.com> wrote:

> @@ -1014,6 +1090,9 @@ keep_lumpy:

I worry that your tree has the label "keep_lumpy" in it!  Are you
developing against recent kernels?

>  		VM_BUG_ON(PageLRU(page) || PageUnevictable(page));
>  	}
>  
> +	nr_reclaimed += __remove_mapping_batch(&unmap_pages, &ret_pages,
> +					       &free_pages);
> +
>  	/*
>  	 * Tag a zone as congested if all the dirty pages encountered were
>  	 * backed by a congested BDI. In this case, reclaimers should just
> 
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