linux-kernel - Re: uncached page allocator

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Message-Id: <1187708165.6114.256.camel@twins>
Date:	Tue, 21 Aug 2007 16:56:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dave Airlie <airlied@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	dri-devel <dri-devel@...ts.sourceforge.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management <linux-mm@...ck.org>
Subject: Re: uncached page allocator

On Tue, 2007-08-21 at 16:05 +1000, Dave Airlie wrote:

> So you can see why some sort of uncached+writecombined page cache
> would be useful, I could just allocate a bunch of pages at startup as
> uncached+writecombined, and allocate pixmaps from them and when I
> bind/free the pixmap I don't need the flush at all, now I'd really
> like this to be part of the VM so that under memory pressure it can
> just take the pages I've got in my cache back and after flushing turn
> them back into cached pages, the other option is for the DRM to do
> this on its own and penalise the whole system.

Can't you make these pages part of the regular VM by sticking them all
into an address_space.

And for this reclaim behaviour you'd only need to set PG_private and
have a_ops->releasepage() dtrt.



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