linux-kernel - Re: [PATCH 14/14] mm,migration: Allow the migration of PageSwapCache pages

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Message-ID: <q2r28c262361003311939zbfa8e980ifa9c58cb9d62dc83@mail.gmail.com>
Date:	Thu, 1 Apr 2010 11:39:42 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 14/14] mm,migration: Allow the migration of PageSwapCache 
	pages

On Thu, Apr 1, 2010 at 8:57 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com>
>
> rmap_walk_anon() is called against unmapped pages.
> Then, !page_mapped() is always true. So, the behavior will not be different from
> the last one.
>

rmap_walk_anon can be also called in case of failing try_to_unmap.
Then, In unmap_and_move, page_mapped is true and
remove_migration_ptes can be called.

But I am not sure this Mel's patch about this part is really needed.

> Thanks,
> -Kame
>
>



-- 
Kind regards,
Minchan Kim
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