linux-kernel - Re: [PATCH] vmscan: add barrier to prevent evictable page in unevictable list

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Message-ID: <CAF1ivSbPoC_ngCmwmTC+JJuNxhhSoJyCRhTRcWj9V9VgYwU9jQ@mail.gmail.com>
Date:	Thu, 29 Sep 2011 09:02:36 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
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>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: [PATCH] vmscan: add barrier to prevent evictable page in
 unevictable list

On Thu, Sep 29, 2011 at 2:05 AM, Minchan Kim <minchan.kim@...il.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@...il.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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