linux-kernel - Re: [PATCH] mm/swap.c: clear PageActive before adding pages onto unevictable list (Re: 3.11.0-rc1: kernel BUG at mm/migrate.c:458 in page migration)

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Message-ID: <1374084363-9zlarbf2-mutt-n-horiguchi@ah.jp.nec.com>
Date:	Wed, 17 Jul 2013 14:06:03 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	linux-mm@...ck.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	kirill.shutemov@...ux.intel.com
Subject: Re: [PATCH] mm/swap.c: clear PageActive before adding pages onto
 unevictable list (Re: 3.11.0-rc1: kernel BUG at mm/migrate.c:458 in page
 migration)

On Wed, Jul 17, 2013 at 12:35:50PM -0400, Naoya Horiguchi wrote:
...
> ---
> From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Date: Wed, 17 Jul 2013 11:49:56 -0400
> Subject: [PATCH] mm/swap.c: clear PageActive before adding pages onto
>  unevictable list
> 
> As a result of v3.10-3600-g13f7f78 "mm: pagevec: defer deciding which LRU
> to add a page to until pagevec drain time," pages on unevictable lists can
> have both of PageActive and PageUnevictable set. This is not only confusing,
> but also corrupts page migration and shrink_[in]active_list.
> 
> This patch fixes the problem by adding ClearPageActive before adding pages
> into unevictable list. It also cleans up VM_BUG_ONs.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: stable@...r.kernel.org # 3.10

No need to send to stable because the problem occurs after 3.10, sorry.

Naoya Horiguchi
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