From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Tue, 14 Aug 2007 21:11:57 +0100 (BST) Received: from ns1.suse.de ([195.135.220.2]:60898 "EHLO mx1.suse.de") by ftp.linux-mips.org with ESMTP id S20023302AbXHNULt (ORCPT ); Tue, 14 Aug 2007 21:11:49 +0100 Received: from Relay1.suse.de (mail2.suse.de [195.135.221.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.suse.de (Postfix) with ESMTP id C86DE126E8; Tue, 14 Aug 2007 22:11:43 +0200 (CEST) Date: Tue, 14 Aug 2007 23:05:51 +0200 From: Andi Kleen To: Andy Isaacson Cc: Andi Kleen , Alan Cox , Christoph Lameter , Mel Gorman , Lee.Schermerhorn@hp.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-mips@linux-mips.org Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer Message-ID: <20070814210551.GU3406@bingen.suse.de> References: <20070813230801.GH3406@bingen.suse.de> <20070813234322.GJ3406@bingen.suse.de> <20070814000041.GL3406@bingen.suse.de> <20070814002223.2d8d42c5@the-village.bc.nu> <20070814001441.GN3406@bingen.suse.de> <20070814191158.GB14093@hexapodia.org> <20070814202350.GT3406@bingen.suse.de> <20070814194356.GL21492@hexapodia.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070814194356.GL21492@hexapodia.org> Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 16185 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ak@suse.de Precedence: bulk X-list: linux-mips > Yeah, if you stick a PCI chip with a 30-bit PCI DMA mask into a machine > with memory above 1GB, then copying has to happen. Unless the memory > allocator can avoid returning memory in the un-dma-able region... With GFP_DMA this was possible, but the capability will be gone for x86 systems if your required DMA region is < 4GB. Besides I'm currently not planning to change mips so it might stay the same if Ralf prefers that. -Andi From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 14 Aug 2007 23:05:51 +0200 From: Andi Kleen Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer Message-ID: <20070814210551.GU3406@bingen.suse.de> References: <20070813230801.GH3406@bingen.suse.de> <20070813234322.GJ3406@bingen.suse.de> <20070814000041.GL3406@bingen.suse.de> <20070814002223.2d8d42c5@the-village.bc.nu> <20070814001441.GN3406@bingen.suse.de> <20070814191158.GB14093@hexapodia.org> <20070814202350.GT3406@bingen.suse.de> <20070814194356.GL21492@hexapodia.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070814194356.GL21492@hexapodia.org> Sender: owner-linux-mm@kvack.org Return-Path: To: Andy Isaacson Cc: Andi Kleen , Alan Cox , Christoph Lameter , Mel Gorman , Lee.Schermerhorn@hp.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-mips@linux-mips.org List-ID: > Yeah, if you stick a PCI chip with a 30-bit PCI DMA mask into a machine > with memory above 1GB, then copying has to happen. Unless the memory > allocator can avoid returning memory in the un-dma-able region... With GFP_DMA this was possible, but the capability will be gone for x86 systems if your required DMA region is < 4GB. Besides I'm currently not planning to change mips so it might stay the same if Ralf prefers that. -Andi -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org