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Date: Thu, 29 Sep 2011 09:02:36 +0800
Message-ID: <CAF1ivSbPoC_ngCmwmTC+JJuNxhhSoJyCRhTRcWj9V9VgYwU9jQ@mail.gmail.com>
Subject: Re: [PATCH] vmscan: add barrier to prevent evictable page in
 unevictable list
From: Lin Ming <mlin@ss.pku.edu.cn>
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To: Minchan Kim <minchan.kim@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-mm <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, Johannes Weiner <jweiner@redhat.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Mel Gorman <mel@csn.ul.ie>, Rik van Riel <riel@redhat.com>, Lee Schermerhorn <lee.schermerhorn@hp.com>

On Thu, Sep 29, 2011 at 2:05 AM, Minchan Kim <minchan.kim@gmail.com> wrote:
> On Wed, Sep 28, 2011 at 11:04:05PM +0800, Lin Ming wrote:
>> On Wed, Sep 28, 2011 at 9:45 AM, Minchan Kim <minchan.kim@gmail.com> wrote:
>> > When racing between putback_lru_page and shmem_unlock happens,
>>
>> s/shmem_unlock/shmem_lock/
>
> I did it intentionally for represent shmem_lock with user = 1, lock = 0.
> If you think it makes others confusing, I will change in next version.
> Thanks.

I was confused. Now I understand.

>
>>
>> > progrom execution order is as follows, but clear_bit in processor #1
>> > could be reordered right before spin_unlock of processor #1.
>> > Then, the page would be stranded on the unevictable list.
>
> --
> Kind regards,
> Minchan Kim

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