Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761393AbZAQGjS (ORCPT ); Sat, 17 Jan 2009 01:39:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753322AbZAQGjE (ORCPT ); Sat, 17 Jan 2009 01:39:04 -0500 Received: from terminus.zytor.com ([198.137.202.10]:59858 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753176AbZAQGjC (ORCPT ); Sat, 17 Jan 2009 01:39:02 -0500 Message-ID: <49717D03.2030205@zytor.com> Date: Fri, 16 Jan 2009 22:38:59 -0800 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: sidc7 CC: linux-kernel@vger.kernel.org Subject: Re: Kernel vs user memory References: <21512362.post@talk.nabble.com> <49717A28.2060106@zytor.com> <21513615.post@talk.nabble.com> In-Reply-To: <21513615.post@talk.nabble.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 803 Lines: 21 sidc7 wrote: > If I am not mistaken, Linux kernel is a high memory kernel, hence for Linux > kernel, nothing will be mapped to the kernel space, other than the memory > beyond 896MB which is the kernel's virtual address space. Am I right on > this? It's a compilation option, and depends on the architecture. What you described is true for an i386 kernel compiled as a highmem kernel. On the other hand, a 64 bit kernel is *never* highmem. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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/