linux-kernel - Re: [PATCH 2/2] wait for page writeback when directly reclaiming contiguous areas

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Date:	Mon, 6 Aug 2007 12:22:04 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andy Whitcroft <apw@...dowen.org>
Cc:	Mel Gorman <mel@....ul.ie>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] wait for page writeback when directly reclaiming
 contiguous areas

On Thu, 02 Aug 2007 19:18:43 +0100 Andy Whitcroft <apw@...dowen.org> wrote:

> @@ -458,8 +475,15 @@ static unsigned long shrink_page_list(struct list_head *page_list,
>  		if (page_mapped(page) || PageSwapCache(page))
>  			sc->nr_scanned++;
>  
> -		if (PageWriteback(page))
> -			goto keep_locked;
> +		may_enter_fs = (sc->gfp_mask & __GFP_FS) ||
> +			(PageSwapCache(page) && (sc->gfp_mask & __GFP_IO));
> +
> +		if (PageWriteback(page)) {
> +			if (sync_writeback == PAGEOUT_IO_SYNC && may_enter_fs)
> +				wait_on_page_writeback(page);
> +			else
> +				goto keep_locked;
> +		}

this bit could do with a comment explaining the design decisions, please.
-
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