linux-kernel - Re: [PATCH v2 03/10] Change isolate mode from int type to enum type

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Date:	Tue, 31 May 2011 15:36:11 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH v2 03/10] Change isolate mode from int type to enum type

On Mon, May 30, 2011 at 03:13:42AM +0900, Minchan Kim wrote:
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -957,23 +957,29 @@ keep_lumpy:
>   *
>   * returns 0 on success, -ve errno on failure.
>   */
> -int __isolate_lru_page(struct page *page, int mode, int file)
> +int __isolate_lru_page(struct page *page, enum ISOLATE_PAGE_MODE mode,
> +							int file)
>  {
> +	int active;
>  	int ret = -EINVAL;
> +	BUG_ON(mode & ISOLATE_BOTH &&
> +		(mode & ISOLATE_INACTIVE || mode & ISOLATE_ACTIVE));
>  
>  	/* Only take pages on the LRU. */
>  	if (!PageLRU(page))
>  		return ret;
>  
> +	active = PageActive(page);
> +
>  	/*
>  	 * When checking the active state, we need to be sure we are
>  	 * dealing with comparible boolean values.  Take the logical not
>  	 * of each.
>  	 */
> -	if (mode != ISOLATE_BOTH && (!PageActive(page) != !mode))
> +	if (mode & ISOLATE_ACTIVE && !active)
>  		return ret;
>  
> -	if (mode != ISOLATE_BOTH && page_is_file_cache(page) != file)
> +	if (mode & ISOLATE_INACTIVE && active)
>  		return ret;

What happened to the check for file pages?
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