linux-kernel - Re: [PATCH 1/2] Check PageUnevictable in lru_deactivate

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Message-ID: <BANLkTi=c2tBcXJnFi-i4r1_ADiMFebmxMA@mail.gmail.com>
Date:	Sun, 1 May 2011 15:10:58 -0700
From:	Ying Han <yinghan@...gle.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>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH 1/2] Check PageUnevictable in lru_deactivate_fn

On Sun, May 1, 2011 at 8:03 AM, Minchan Kim <minchan.kim@...il.com> wrote:
> The lru_deactivate_fn should not move page which in on unevictable lru
> into inactive list. Otherwise, we can meet BUG when we use isolate_lru_pages
> as __isolate_lru_page could return -EINVAL.
> It's really BUG and let's fix it.
>
> Reported-by: Ying Han <yinghan@...gle.com>
> Tested-by: Ying Han <yinghan@...gle.com>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> ---
>  mm/swap.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/mm/swap.c b/mm/swap.c
> index a83ec5a..2e9656d 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -429,6 +429,9 @@ static void lru_deactivate_fn(struct page *page, void *arg)
>        if (!PageLRU(page))
>                return;
>
> +       if (PageUnevictable(page))
> +               return;
> +
>        /* Some processes are using the page */
>        if (page_mapped(page))
>                return;
> --
> 1.7.1

Thanks Minchan for the fix, and i haven't been able to reproducing the
issue after applying the patch.

--Ying

>
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