linux-kernel - Re: [PATCH 2/3][v2] vmstat: add anon_scan

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Message-Id: <20100114141735.672B.A69D9226@jp.fujitsu.com>
Date:	Thu, 14 Jan 2010 14:18:52 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 2/3][v2] vmstat: add anon_scan_ratio field to zoneinfo

> > 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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