linux-kernel - Re: [patch 1/2] agpgart - allow user-populated memory types.

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Date:	Tue, 19 Dec 2006 13:17:29 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Thomas Hellström <thomas@...gstengraphics.com>
Cc:	Dave Jones <davej@...hat.com>, Dave Airlie <airlied@...ux.ie>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [patch 1/2] agpgart - allow user-populated memory types.


> A short background:
> The current code uses vmalloc only. The potential use of kmalloc was 
> introduced
> to save memory and cpu-speed.
> All agp drivers expect to see a single memory chunk, so I'm not sure we 
> want to have an array of pages. That may require rewriting a lot of code.

but if it's clearly the right thing.....
How hard can it be? there are what.. 5 or 6 AGP drivers in the kernel?


> If it's acceptable I'd like to go for the vmalloc / kmalloc flag, or at 
> worst keep the current vmalloc only but that's such a _huge_ memory 
> waste for small buffers. The flag was the original idea, but 
> unfortunately the agp_memory struct is part of the drm interface, and I 
> wasn't sure we could add a variable to it.

I doubt this is part of the userspace interface so for sure we can
change it to be right.


-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
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