Re: agpgart: drm-populated memory types

From: Arjan van de Ven
Date: Mon Jan 08 2007 - 21:38:15 EST



>
> A short recap why I belive the kmalloc / vmalloc construct is necessary:
>
> 0) The current code uses vmalloc only.
> 1) The allocated area ranges from 4 bytes possibly up to 512 kB, depending on
> on the size of the AGP buffer allocated.
> 2) Large buffers are very few. Small buffers tend to be quite many.
> If we continue to use vmalloc only or another page-based scheme we will
> waste approx one page per buffer, together with the added slowness of
> vmalloc. This will severely hurt applications with a lot of small
> texture buffers.
>
> Please let me know if you still consider this unacceptable.

explicit use of either kmalloc/vmalloc is fine with me; I would suggest
an 2*PAGE_SIZE cutoff for this decision

>
> In that case I suggest sticking with vmalloc for now.
>
> Also please let me know if there are other parths of the patch that should be
> reworked.
>
> The patch that follows is against Dave's agpgart repo.
>
<you forgot the patch>

--
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