From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from westrelay02.boulder.ibm.com (westrelay02.boulder.ibm.com [9.17.195.11]) by e35.co.us.ibm.com (8.12.11/8.12.11) with ESMTP id j95G34bN016919 for ; Wed, 5 Oct 2005 12:03:04 -0400 Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by westrelay02.boulder.ibm.com (8.12.10/NCO/VERS6.7) with ESMTP id j95G5mfK543026 for ; Wed, 5 Oct 2005 10:05:48 -0600 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.12.11/8.13.3) with ESMTP id j95G5lRm027978 for ; Wed, 5 Oct 2005 10:05:47 -0600 Subject: Re: sparsemem & sparsemem extreme question From: Dave Hansen In-Reply-To: <20051005155823.GA10119@osiris.ibm.com> References: <20051004065030.GA21741@osiris.boeblingen.de.ibm.com> <1128442502.20208.6.camel@localhost> <20051005063909.GA9699@osiris.boeblingen.de.ibm.com> <1128527554.26009.2.camel@localhost> <20051005155823.GA10119@osiris.ibm.com> Content-Type: text/plain Date: Wed, 05 Oct 2005 09:05:40 -0700 Message-Id: <1128528340.26009.8.camel@localhost> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Heiko Carstens Cc: linux-mm List-ID: On Wed, 2005-10-05 at 17:58 +0200, Heiko Carstens wrote: > we have the 1:1 mapping already > today. So adding anything to the vmalloc area won't make it more expensive. The pagetables themselves have a cost, as do the lookups. Those make it more expensive. On 64-bit machines the vaddr space is not an expense. > No, my concern is actually that the s390 archticture actually will come up > with some sort of memory that's present in the physical address space where > the most significant bit of the addresses will be turned _on_. Why do you think this? -- Dave -- 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