From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 17 May 2002 00:49:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 17 May 2002 00:49:23 -0400 Received: from holomorphy.com ([66.224.33.161]:27561 "EHLO holomorphy") by vger.kernel.org with ESMTP id ; Fri, 17 May 2002 00:49:21 -0400 Date: Thu, 16 May 2002 21:47:48 -0700 From: William Lee Irwin III To: Mel Cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH] Updated Commentry Patches Message-ID: <20020517044748.GP7076@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Mel , linux-kernel@vger.kernel.org In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Description: brief message Content-Disposition: inline User-Agent: Mutt/1.3.25i Organization: The Domain of Holomorphy Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > 2.4.19pre8_page_alloc_commentry > http://www.csn.ul.ie/~mel/projects/vm/patches/2.4.19pre8_page_alloc_commentry > This extends the documentation on page_alloc.c to describe how the buddy > allocator works One way to describe the bit toggling behavior is saying that each page has a "virtual bit", the bit present in the bitmap is the xor of the "virtual bits" of the two buddies, and the buddy's bit is recovered by xor'ing with the bit of the page we're examining, which is known from the entry point. Cheers, Bill