linux-kernel - Re: [PATCH] ttm: add pool wc/uc page allocator

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Date:	Fri, 17 Jul 2009 16:55:08 +0200
From:	Jerome Glisse <glisse@...edesktop.org>
To:	Michel Dänzer <michel@...nzer.net>
Cc:	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.sf.net
Subject: Re: [PATCH] ttm: add pool wc/uc page allocator

On Fri, 2009-07-17 at 10:01 +0200, Michel Dänzer wrote:
> On Thu, 2009-07-16 at 18:34 +0200, Jerome Glisse wrote: 
> > On Thu, 2009-07-16 at 18:13 +0200, Jerome Glisse wrote:
> > > On AGP system we might allocate/free routinely uncached or wc memory,
> > > changing page from cached (wb) to uc or wc is very expensive and involves
> > > a lot of flushing. To improve performance this allocator use a pool
> > > of uc,wc pages.
> > > 
> > > Currently each pool (wc, uc) is 256 pages big, improvement would be
> > > to tweak this according to memory pressure so we can give back memory
> > > to system.
> > > 
> > > Signed-off-by: Dave Airlie <airlied@...hat.com>
> > > Signed-off-by: Jerome Glisse <jglisse@...hat.com>
> > 
> > Just a follow-up on that one, i haven't been able yet to thoroughly
> > test this patch on AGP system, so i am mostly sending so other people
> > can test. I think i corrected few bugs that were in previous iteration
> > of that patch.
> > 
> > Beside that i think i have addressed all comment previously raisen,
> > but don't hesitate to pin point any things i have miss.
> 
> This one works a little better on my PowerBook than the previous one:
> 
> PCI GART works (failed to allocate the ring buffer before)
> AGP fails to allocate the ring buffer (paniced at KMS init before)
> 

Attached a new version which more or less work on x86 agp (i have
screen corruption haven't tracked done what is causing it yet).
I corrected more bugs from previous version, hopefully i am getting
closer to somethings which works.

Cheers,
Jerome

View attachment "0001-ttm-add-pool-wc-uc-page-allocator.patch" of type "text/x-patch" (15271 bytes)