From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764601AbYEFJEp (ORCPT ); Tue, 6 May 2008 05:04:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763440AbYEFI5V (ORCPT ); Tue, 6 May 2008 04:57:21 -0400 Received: from saeurebad.de ([85.214.36.134]:43606 "EHLO saeurebad.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763483AbYEFI5T (ORCPT ); Tue, 6 May 2008 04:57:19 -0400 From: Johannes Weiner To: Andi Kleen Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Ingo Molnar , Yinghai Lu , Andrew Morton , Linus Torvalds , Yasunori Goto Subject: Re: [rfc][patch 0/3] bootmem2: a memory block-oriented boot time allocator References: <20080505095938.326928514@symbol.fehenstaub.lan> <481F58DD.9000600@firstfloor.org> Date: Tue, 06 May 2008 10:57:12 +0200 In-Reply-To: <481F58DD.9000600@firstfloor.org> (Andi Kleen's message of "Mon, 05 May 2008 20:58:37 +0200") Message-ID: <87r6cflsif.fsf@saeurebad.de> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.1.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Andi Kleen writes: >> (because a PFN is not unique anymore) > > That doesn't make sense. If a PFN is not uniquely mapping to a single > memory page anymore the VM and lots of other code in the kernel will > just not work. And each memory page can be only in a single node. I meant it is not unique to the bootmem allocator because two bitmaps might partially represent the same page range. Hannes