linux-kernel - Re: [RFC 0/3] Pin page control subsystem

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Message-id: <1376387202.31048.2.camel@AMDC1943>
Date:	Tue, 13 Aug 2013 11:46:42 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Mel Gorman <mgorman@...e.de>, guz.fnst@...fujitsu.com,
	Benjamin LaHaise <bcrl@...ck.org>,
	Dave Hansen <dave.hansen@...el.com>, lliubbo@...il.com,
	aquini@...hat.com, Rik van Riel <riel@...hat.com>,
	Tomasz Stanislawski <t.stanislaws@...sung.com>
Subject: Re: [RFC 0/3] Pin page control subsystem

Hi Minchan,

On wto, 2013-08-13 at 16:04 +0900, Minchan Kim wrote:
> patch 2 introduce pinpage control
> subsystem. So, subsystems want to control pinpage should implement own
> pinpage_xxx functions because each subsystem would have other character
> so what kinds of data structure for managing pinpage information depends
> on them. Otherwise, they can use general functions defined in pinpage
> subsystem. patch 3 hacks migration.c so that migration is
> aware of pinpage now and migrate them with pinpage subsystem.

I wonder why don't we use page->mapping and a_ops? Is there any
disadvantage of such mapping/a_ops?

Best regards,
Krzysztof

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