linux-kernel - Re: [PATCH] vmscan: Make move_active_pages_to

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Message-ID: <4CE95FD7.1060805@redhat.com>
Date:	Sun, 21 Nov 2010 13:07:19 -0500
From:	Rik van Riel <riel@...hat.com>
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>,
	Wu Fengguang <fengguang.wu@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] vmscan: Make move_active_pages_to_lru more generic

On 11/21/2010 09:24 AM, Minchan Kim wrote:
> Now move_active_pages_to_lru can move pages into active or inactive.
> if it moves the pages into inactive, it itself can clear PG_acive.
> It makes the function more generic.

> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index aa4f1cb..bd408b3 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1457,6 +1457,10 @@ static void move_active_pages_to_lru(struct zone *zone,
>   		VM_BUG_ON(PageLRU(page));
>   		SetPageLRU(page);
>
> +		/* we are de-activating */
> +		if (!is_active_lru(lru))
> +			ClearPageActive(page);
> +

Does that mean we also want code to ensure that pages have
the PG_active bit set when we add them to an active list?

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