linux-kernel - Re: [patch 2/2] reduce tlb/cache flush times of agpgart memory allocation

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Message-ID: <20080815144312.GI12954@elte.hu>
Date:	Fri, 15 Aug 2008 16:43:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Shaohua Li <shaohua.li@...el.com>,
	lkml <linux-kernel@...r.kernel.org>, airlied@...ux.ie,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [patch 2/2] reduce tlb/cache flush times of agpgart memory
	allocation


* Arjan van de Ven <arjan@...radead.org> wrote:

> On Fri, 15 Aug 2008 16:31:31 +0200
> Ingo Molnar <mingo@...e.hu> wrote:
> 
> > 
> > * Shaohua Li <shaohua.li@...el.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

ok, agreed.

	Ingo
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