linux-kernel - Race condition between putback_lru_page and mem_cgroup_move

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Date:	Mon, 4 Aug 2008 23:36:25 +0900
From:	"MinChan Kim" <minchan.kim@...il.com>
To:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
Cc:	linux-mm <linux-mm@...ck.org>, "Rik van Riel" <riel@...hat.com>,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"Lee Schermerhorn" <lee.schermerhorn@...com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Race condition between putback_lru_page and mem_cgroup_move_list

I think this is a race condition if mem_cgroup_move_lists's comment isn't right.
I am not sure that it was already known problem.

mem_cgroup_move_lists assume the appropriate zone's lru lock is already held.
but putback_lru_page calls mem_cgroup_move_lists without holding lru_lock.

Repeatedly, spin_[un/lock]_irq use in mem_cgroup_move_list have a big overhead
while doing list iteration.

Do we have to use pagevec ?

-- 
Kinds regards,
MinChan Kim
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