linux-kernel - Re: [PATCH -mm 10/25] add newly swapped in pages to the inactive list

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Message-Id: <20080606180456.8139c57d.akpm@linux-foundation.org>
Date:	Fri, 6 Jun 2008 18:04:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, lee.schermerhorn@...com,
	kosaki.motohiro@...fujitsu.com
Subject: Re: [PATCH -mm 10/25] add newly swapped in pages to the inactive
 list

On Fri, 06 Jun 2008 16:28:48 -0400
Rik van Riel <riel@...hat.com> wrote:

> From: Rik van Riel <riel@...hat.com>
> 
> Swapin_readahead can read in a lot of data that the processes in
> memory never need.  Adding swap cache pages to the inactive list
> prevents them from putting too much pressure on the working set.
> 
> This has the potential to help the programs that are already in
> memory, but it could also be a disadvantage to processes that
> are trying to get swapped in.
> 
> In short, this patch needs testing.
> 

<hopes that the changelog is out of date>

> 
> ---
>  mm/swap_state.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6.26-rc2-mm1/mm/swap_state.c
> ===================================================================
> --- linux-2.6.26-rc2-mm1.orig/mm/swap_state.c	2008-05-28 09:40:59.000000000 -0400
> +++ linux-2.6.26-rc2-mm1/mm/swap_state.c	2008-05-28 09:42:26.000000000 -0400
> @@ -302,7 +302,7 @@ struct page *read_swap_cache_async(swp_e
>  			/*
>  			 * Initiate read into locked page and return.
>  			 */
> -			lru_cache_add_active_anon(new_page);
> +			lru_cache_add_anon(new_page);
>  			swap_readpage(NULL, new_page);
>  			return new_page;
>  		}

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