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

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Date:	Thu, 16 Jul 2009 18:34:35 +0200
From:	Jerome Glisse <glisse@...edesktop.org>
To:	Jerome Glisse <jglisse@...hat.com>
Cc:	airlied@...il.com, dri-devel@...ts.sf.net,
	linux-kernel@...r.kernel.org, Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH] ttm: add pool wc/uc page allocator

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.

Cheers,
Jerome

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