From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [PATCH 2/3][v2] vmstat: add anon_scan_ratio field to zoneinfo
Cc: kosaki.motohiro@jp.fujitsu.com, LKML <linux-kernel@vger.kernel.org>,
       linux-mm <linux-mm@kvack.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Balbir Singh <balbir@linux.vnet.ibm.com>,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Rik van Riel <riel@redhat.com>
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References: <20100114084659.D713.A69D9226@jp.fujitsu.com> <28c262361001132112i7f50fd66qcd24dc2ddb4d78d8@mail.gmail.com>
Message-Id: <20100114141735.672B.A69D9226@jp.fujitsu.com>
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Date: Thu, 14 Jan 2010 14:18:52 +0900 (JST)
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> > Well. zone->lock and zone->lru_lock should be not taked at the same time.
> 
> I looked over the code since I am out of office.
> I can't find any locking problem zone->lock and zone->lru_lock.
> Do you know any locking order problem?
> Could you explain it with call graph if you don't mind?
> 
> I am out of office by tomorrow so I can't reply quickly.
> Sorry for late reponse.

This is not lock order issue. both zone->lock and zone->lru_lock are
hotpath lock. then, same tame grabbing might cause performance impact.

thanks.


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