linux-kernel - Re: [RFCv5 0/9] CMA + VCMM integration

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Message-id: <op.vim2x8i87p4s8u@localhost>
Date:	Tue, 07 Sep 2010 03:40:46 +0200
From:	Michał Nazarewicz <m.nazarewicz@...sung.com>
To:	Greg KH <greg@...ah.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Walker <dwalker@...eaurora.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Hans Verkuil <hverkuil@...all.nl>,
	Jonathan Corbet <corbet@....net>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mel Gorman <mel@....ul.ie>,
	Minchan Kim <minchan.kim@...il.com>,
	Pawel Osciak <p.osciak@...sung.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Russell King <linux@....linux.org.uk>,
	Zach Pfeffer <zpfeffer@...eaurora.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFCv5 0/9] CMA + VCMM integration

On Mon, 06 Sep 2010 23:09:05 +0200, Greg KH <greg@...ah.com> wrote:

> On Mon, Sep 06, 2010 at 08:33:50AM +0200, Michal Nazarewicz wrote:
>> Hello everyone,
>>
>> This patchset introduces a draft of a redesign of Zach Pfeffer's
>> VCMM.
>
> What is a VCMM?

Virtual Contiguous Memory Manager.  The version posted by Zach can
be found at: <http://article.gmane.org/gmane.linux.kernel.mm/50090>.
It is an API for managing IO MMU and IO MMU mappings.

> What is a CMA?

Contiguous Memory Manager.  The v4 version can be found at
<http://marc.info/?l=linux-mm&m=128229799415817&w=2>.  It is an API for
allocating large, physically contiguous blocks of memory.

I haven't expected that anyone who haven't already participated in the
discussion about CMA and VCMM will get interested by this patchset
so I was a bit vague in the cover letter.  Sorry about that.

>> Not all of the functionality of the original VCMM has been
>> ported into this patchset.  This is mostly meant as RFC.  Moreover,
>> the code for VCMM implementation in this RFC has not been tested.

> If you haven't even tested it, why should we review it?

Ignore the code then and look just at the documentation, please.
I wanted to post what I have to receive comments about the general
idea and not necessarily the code itself.  Code is just a mean to show
how I see the implementation of the idea described in the documentation.
Because of all that, I marked the patchset as a RFC rather than a PATCH.

-- 
Best regards,                                        _     _
| Humble Liege of Serenely Enlightened Majesty of  o' \,=./ `o
| Computer Science,  Michał "mina86" Nazarewicz       (o o)
+----[mina86*mina86.com]---[mina86*jabber.org]----ooO--(_)--Ooo--

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