linux-kernel - Re: Race condition between putback_lru_page and mem_cgroup_move

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Message-Id: <20080807185203.A8C2.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Thu, 07 Aug 2008 20:00:37 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	kosaki.motohiro@...fujitsu.com, balbir@...ux.vnet.ibm.com,
	MinChan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Race condition between putback_lru_page and mem_cgroup_move_list

Hi

> If you mean the "active/inactive list transition" in
> shrink_[in]active_list(), these are already batched under zone lru_lock
> with batch size determined by the 'release pages' pvec.  So, I think
> we're OK here.

No.

AFAIK shrink_inactive_list batched zone->lru_lock, 
but it doesn't batched mz->lru_lock.

then, spin_lock_irqsave is freqently called.



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