Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932395AbWBXR1M (ORCPT ); Fri, 24 Feb 2006 12:27:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932397AbWBXR1M (ORCPT ); Fri, 24 Feb 2006 12:27:12 -0500 Received: from smtp.osdl.org ([65.172.181.4]:36756 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S932395AbWBXR1L (ORCPT ); Fri, 24 Feb 2006 12:27:11 -0500 Date: Fri, 24 Feb 2006 09:26:51 -0800 (PST) From: Linus Torvalds To: "Eric W. Biederman" cc: Rene Herman , Arjan van de Ven , Andi Kleen , linux-kernel@vger.kernel.org, akpm@osdl.org, mingo@elte.hu Subject: Re: Patch to reorder functions in the vmlinux to a defined order In-Reply-To: Message-ID: References: <1140700758.4672.51.camel@laptopd505.fenrus.org> <1140707358.4672.67.camel@laptopd505.fenrus.org> <200602231700.36333.ak@suse.de> <1140713001.4672.73.camel@laptopd505.fenrus.org> <43FE0B9A.40209@keyaccess.nl> <43FE1764.6000300@keyaccess.nl> <43FE4B00.8080205@keyaccess.nl> <43FF26A8.9070600@keyaccess.nl> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1002 Lines: 28 On Fri, 24 Feb 2006, Eric W. Biederman wrote: > > > To my handwaving ears end of the address space sounds very good though. Is there > > currently any pressure on VMALLOC_RESERVE (128M)? Teaching the linker appears to > > be a matter of changing __KERNEL_START. That leaves actually mapping ourselves > > there, and... more invasiveness? > > __pa stops working on kernel addresses. That's not the issue. The real issue is the _physical_ address. Nothing else matters. If the TLB splitting on the fixed MTRRs is an issue, it depends entirely on what physical address the kernel resides in, and the virtual address is totally inconsequential. So playing games with virtual mapping has absolutely no upsides, and it definitely has downsides. Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/