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Date: Mon, 31 Mar 2003 23:02:51 +0200
From: Ingo Oeser <ingo.oeser@informatik.tu-chemnitz.de>
To: William Lee Irwin III <wli@holomorphy.com>,
       Andrea Arcangeli <andrea@suse.de>, linux-kernel@vger.kernel.org
Subject: Re: 64GB NUMA-Q after pgcl
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References: <20030328040038.GO1350@holomorphy.com> <20030330231945.GH2318@x30.local> <20030331042729.GQ30140@holomorphy.com> <20030331052214.GV13178@holomorphy.com>
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In-Reply-To: <20030331052214.GV13178@holomorphy.com>; from wli@holomorphy.com on Sun, Mar 30, 2003 at 09:22:14PM -0800
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Hi William,
hi Andrea,

On Sun, Mar 30, 2003 at 09:22:14PM -0800, William Lee Irwin III wrote:
> Miscellaneous side effects happen, like follow_page() and
> get_user_pages() need to return pfn's instead of struct pages.

Hmm, but you know, that users of get_user_pages() play games with
pages? They need to lock them into memory, mark them eventually
dirty, map them to a struct scatterlist and much more.

I worked on an API (I called it the page-walk-api), to make this
more and more transparent. 

So if this work will go into 2.6.x, then the page-walk-API will
be needed, or else the driver writers playing tricks with
virtual<->physical<->bus address conversions will go nuts.

So which kernel is the target of this development?

Regards

Ingo Oeser
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