Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757164AbYCJV1Y (ORCPT ); Mon, 10 Mar 2008 17:27:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753905AbYCJV1O (ORCPT ); Mon, 10 Mar 2008 17:27:14 -0400 Received: from gw.goop.org ([64.81.55.164]:59065 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751075AbYCJV1M (ORCPT ); Mon, 10 Mar 2008 17:27:12 -0400 Message-ID: <47D5A778.3020500@goop.org> Date: Mon, 10 Mar 2008 14:26:16 -0700 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.12 (X11/20080226) MIME-Version: 1.0 To: "H. Peter Anvin" CC: Andi Kleen , Hugh Dickins , Christoph Lameter , Andrew Morton , Ingo Molnar , KOSAKI Motohiro , Thomas Gleixner , LKML , Linus Torvalds , Bart Van Assche Subject: Re: quicklists confuse meminfo References: <20080309111456.GA21690@elte.hu> <20080309210000.C6DE.KOSAKI.MOTOHIRO@jp.fujitsu.com> <20080309120940.GA1695@elte.hu> <20080309123432.GA3267@elte.hu> <20080309114640.85c9c3eb.akpm@linux-foundation.org> <87myp68r88.fsf@basil.nowhere.org> <47D57056.3050204@goop.org> <20080310175305.GC7692@one.firstfloor.org> <47D57F86.2020806@goop.org> <47D5A000.6000407@zytor.com> In-Reply-To: <47D5A000.6000407@zytor.com> X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 860 Lines: 22 H. Peter Anvin wrote: > Jeremy Fitzhardinge wrote: >> >> Yeah, the most fundamental problem is that the whole page is RO, so >> even if Xen trapped and emulated, it still makes a very bad >> neighbour. I was also going to say that there's no reason why you >> couldn't pack multiple pgds into one page, but I think we can only >> specify the cr3 at page resolution anyway. >> > > Wrong. With PAE you can specify it at any 32-byte boundary. Yes, the x86 lets you, but Xen doesn't - mostly because it reuses the lower 12 bits as upper bits of the pfn so that you can specify a pagetable base at >4G. J -- 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/