linux-kernel - Re: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager

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Message-Id: <20100722134708I.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 22 Jul 2010 13:47:36 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	zpfeffer@...eaurora.org
Cc:	fujita.tomonori@....ntt.co.jp, linux@....linux.org.uk,
	alan@...rguk.ukuu.org.uk, randy.dunlap@...cle.com,
	dwalker@...eaurora.org, mel@....ul.ie,
	linux-arm-msm@...r.kernel.org, joro@...tes.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	andi@...stfloor.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager

On Wed, 21 Jul 2010 20:50:26 -0700
Zach Pfeffer <zpfeffer@...eaurora.org> wrote:

> On Wed, Jul 14, 2010 at 10:59:43AM +0900, FUJITA Tomonori wrote:
> > On Tue, 13 Jul 2010 10:02:23 +0100
> > 
> > Zach Pfeffer said this new VCM infrastructure can be useful for
> > video4linux. However, I don't think we need 3,000-lines another
> > abstraction layer to solve video4linux's issue nicely.
> 
> Its only 3000 lines because I haven't converted the code to use
> function pointers.

The main point is adding a new abstraction that don't provide the huge
benefit.
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