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

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Message-ID: <28c262361001132112i7f50fd66qcd24dc2ddb4d78d8@mail.gmail.com>
Date:	Thu, 14 Jan 2010 14:12:25 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	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

On Thu, Jan 14, 2010 at 8:50 AM, KOSAKI Motohiro
<kosaki.motohiro@...fujitsu.com> wrote:
> Hi
>
>> Hi, Kosaki.
>>
>> On Wed, Jan 13, 2010 at 5:21 PM, KOSAKI Motohiro
>> <kosaki.motohiro@...fujitsu.com> wrote:
>> > Changelog
>> >  from v1
>> >  - get_anon_scan_ratio don't tak zone->lru_lock anymore
>> >   because zoneinfo_show_print takes zone->lock.
>>
>> When I saw this changelog first, I got confused.
>> That's because there is no relation between lru_lock and lock in zone.
>> You mean zoneinfo is allowed to have a stale data?
>> Tend to agree with it.
>
> 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.


-- 
Kind regards,
Minchan Kim
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