linux-kernel - Re: [patch] mm: pageable memory allocator (for DRM-GEM?)

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Message-Id: <1222353487.4343.205.camel@koto.keithp.com>
Date:	Thu, 25 Sep 2008 07:38:07 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Thomas Hellström <thomas@...gstengraphics.com>
Cc:	keithp@...thp.com, Nick Piggin <npiggin@...e.de>,
	"eric@...olt.net" <eric@...olt.net>,
	"hugh@...itas.com" <hugh@...itas.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"airlied@...ux.ie" <airlied@...ux.ie>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"dri-devel@...ts.sourceforge.net" <dri-devel@...ts.sourceforge.net>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch] mm: pageable memory allocator (for DRM-GEM?)

On Thu, 2008-09-25 at 00:19 -0700, Thomas Hellström wrote:
>  If data is
> dirtied in VRAM or the page(s) got discarded
>  we need new pages and to set up a copy operation.

Note that this can occur as a result of a suspend-to-memory transition
at which point *all* of the objects in VRAM will need to be preserved in
main memory, and so the pages aren't really 'freed', they just don't
need to have valid contents, but the system should be aware that the
space may be needed at some point in the future.

-- 
keith.packard@...el.com

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