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

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Date:	Sun, 21 Nov 2010 20:26:39 -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 07:49 PM, Minchan Kim wrote:
> On Mon, Nov 22, 2010 at 3:07 AM, Rik van Riel<riel@...hat.com>  wrote:
>> 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?
>
> Yes. the function name is move_"active"_pages_to_lru.
> So  caller have to make sure pages have PG_active.

Good point.

Acked-by: Rik van Riel <riel@...hat.com>

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