linux-kernel - Re: [PATCH] Export shmem_file_setup and shmem

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Message-ID: <20080806102437.2d5e5d11@infradead.org>
Date:	Wed, 6 Aug 2008 10:24:37 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Stephane Marchesin" <marchesin@...s.u-strasbg.fr>
Cc:	"Keith Packard" <keithp@...thp.com>,
	"John Stoffel" <john@...ffel.org>,
	"Hugh Dickins" <hugh@...itas.com>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Christoph Hellwig" <hch@...radead.org>,
	"Eric Anholt" <eric@...olt.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Export shmem_file_setup and shmem_getpage for DRM-GEM

On Wed, 6 Aug 2008 18:20:40 +0200
"Stephane Marchesin" <marchesin@...s.u-strasbg.fr> wrote:

> On 8/5/08, Keith Packard <keithp@...thp.com> wrote:
> > On Mon, 2008-08-04 at 22:25 -0400, John Stoffel wrote:
> >
> >  > What about the onboard memory of graphics cards?  Isn't that
> >  > where Textures and such are stored as well?  So once something
> >  > is loaded to the card, shouldn't you be able to free it in
> >  > system memory?  Or swap it out ahead of time?
> >
> >
> > Right now, I'm working only on Intel integrated graphics, which
> > doesn't have any on-board memory. My thinking is that we'd best
> > solve the easiest case first before attempting the harder discrete
> > graphics driver. Plus, Intel pays me do do integrated graphics, so
> > I have an incentive.
> >
> 
> Right, but it sounds adventurous to merge this work upstream before it
> is generic enough to work on discrete cards. Right now it only works
> on intel integrated cards ; integrated cards are one business,
> discrete are a completely different world and the issues afoot
> completely different.
> 
> Should this go upstream, the kernel guys have to keep in mind and
> accept the possibility that another memory manager might be needed at
> some point.

the ATI driver guys already have the interface working.

In addition.. since when is "oh you must also make it work for THAT" a
requirement? Traditionally, it's up to the second person to make
generic code work for them (within reason of course, but I'll argue
that the bar of reasonableness has been met here)

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