linux-kernel - Re: [PATCH] Check PageActive when evictable page and unevicetable page race happen

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Message-ID: <BANLkTinW7+14b-DSK80-3ujdgVjTbZ4KCQ@mail.gmail.com>
Date:	Sun, 24 Apr 2011 14:37:12 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: [PATCH] Check PageActive when evictable page and unevicetable
 page race happen

On Sun, Apr 24, 2011 at 9:25 AM, Minchan Kim <minchan.kim@...il.com> wrote:
> In putback_lru_page, unevictable page can be changed into evictable
> 's one while we move it among lru. So we have checked it again and
> rescued it. But we don't check PageActive, again. It could add
> active page into inactive list so we can see the BUG in isolate_lru_pages.
> (But I didn't see any report because I think it's very subtle)
>
> It could happen in race that zap_pte_range's mark_page_accessed and
> putback_lru_page. It's subtle but could be possible.

Please Ignore this. I was confused.
The race never happens.


-- 
Kind regards,
Minchan Kim
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