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Date: Fri, 15 Aug 2008 07:40:33 -0700
From: Arjan van de Ven <arjan@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Shaohua Li <shaohua.li@intel.com>, lkml <linux-kernel@vger.kernel.org>,
       airlied@linux.ie, Andrew Morton <akpm@linux-foundation.org>,
       Ingo Molnar <mingo@redhat.com>,
       Suresh Siddha <suresh.b.siddha@intel.com>,
       "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [patch 2/2] reduce tlb/cache flush times of agpgart memory
 allocation
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On Fri, 15 Aug 2008 16:31:31 +0200
Ingo Molnar <mingo@elte.hu> wrote:

> 
> * Shaohua Li <shaohua.li@intel.com> wrote:
> 
> > To reduce tlb/cache flush, makes agp memory allocation do one flush 
> > after all pages in a region are changed to uc.
> > 
> > All agp drivers except agp-sgi uses agp_generic_alloc_page() for 
> > .agp_alloc_page, so the patch should work for them. agp-sgi is only 
> > for ia64, so not a problem too.
> 
> applied to tip/x86/pat - thanks!
> 
> I've Cc:-ed more PAT folks - any objections?
> 

it really needs something else instead; it needs airlied's array
allocator
otherwise you hit the second wall as well (the pat checks per page)

in reality an array version of ioremap (or set_pages_X) is what is
needed