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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080815074033.4817f876@infradead.org>
Date:	Fri, 15 Aug 2008 07:40:33 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
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

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/