linux-kernel - Re: [PATCH 00/10] mm: Linux VM Infrastructure to support Memory Power Management

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Message-ID: <20110613230400.GL2326@linux.vnet.ibm.com>
Date:	Mon, 13 Jun 2011 16:04:00 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Kyungmin Park <kmpark@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ankita Garg <ankita@...ibm.com>,
	linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	svaidy@...ux.vnet.ibm.com, thomas.abraham@...aro.org
Subject: Re: [PATCH 00/10] mm: Linux VM Infrastructure to support Memory
 Power Management

On Mon, Jun 13, 2011 at 07:28:50AM -0700, Arjan van de Ven wrote:
> On Sun, 12 Jun 2011 16:07:07 -0700
> "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> > > 
> > > the codec issue seems to be solved in time; a previous generation
> > > silicon on our (Intel) side had ARM ecosystem blocks that did not do
> > > scatter gather, however the current generation ARM ecosystem blocks
> > > all seem to have added S/G to them....
> > > (in part this is coming from the strong desire to get camera/etc
> > > blocks to all use "GPU texture" class memory, so that the camera
> > > can directly deposit its information into a gpu texture, and
> > > similar for media encode/decode blocks... this avoids copies as
> > > well as duplicate memory).
> > 
> > That is indeed a clever approach!
> > 
> > Of course, if the GPU textures are in main memory, there will still
> > be memory consumption gains to be had as the image size varies (e.g.,
> > displaying image on one hand vs. menus and UI on the other). 
> 
> graphics drivers and the whole graphics stack is set up to deal with
> that... textures aren't per se "screen size", the texture for a button
> is only as large as the button (with some rounding up to multiples of
> some small power of two) 

In addition, I would expect that for quite some time there will continue
to be a lot of systems with display hardware a bit too simple to qualify
as "GPU".

							Thanx, Paul
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