linux-kernel - Re: io resources and cached mappings (was: [git pull] drm patches for 2.6.27-rc1)

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Message-ID: <20081023080553.GB14714@elte.hu>
Date:	Thu, 23 Oct 2008 10:05:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Keith Packard <keithp@...thp.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dave Airlie <airlied@...ux.ie>,
	Yinghai Lu <yinghai@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: io resources and cached mappings (was: [git pull] drm patches
	for 2.6.27-rc1)


* Keith Packard <keithp@...thp.com> wrote:

> > okay. So ... mind sending your io_mapping patch as a generic 
> > facility? It looks all good to me in its present form, except that 
> > it should live in include/linux/io.h, not in the 
> > drivers/gpu/drm/i915/io_reserve.h file
> > :-)
> 
> The first patch in this series (assuming I'm driving git-send-email 
> correctly) adds the io_mapping API. I ended up creating a new 
> linux/io_mapping.h file as the kernel init code uses io.h and got very 
> angry when I tried to include linux/highmem.h from that. I'm afraid I 
> gave up at that point and just moved the code to a new file.

ah ... good call, i missed that mess. linux/io.h is indeed dependency 
laden and it's best to keep new facilities separated anyway.

> The second patch switches the drm/i915 driver to the new API. 
> Performance improvements on 64-bit kernels are impressive as we were 
> using the slow path before and now get to take advantage of 64-bit 
> wonderfulness.

heh, cool - the wonders of 64-bit x86 :-)

Any ballpark-figure numbers you can share with us?

	Ingo
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