Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267294AbUJGP7x (ORCPT ); Thu, 7 Oct 2004 11:59:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267421AbUJGP7x (ORCPT ); Thu, 7 Oct 2004 11:59:53 -0400 Received: from jade.aracnet.com ([216.99.193.136]:27014 "EHLO jade.spiritone.com") by vger.kernel.org with ESMTP id S267294AbUJGP5t (ORCPT ); Thu, 7 Oct 2004 11:57:49 -0400 Date: Thu, 07 Oct 2004 08:57:04 -0700 From: "Martin J. Bligh" To: Dave Hansen , Matthew E Tolentino cc: Hiroyuki KAMEZAWA , Linux Kernel ML , linux-mm , lhms , Andrew Morton , William Lee Irwin III , "Luck, Tony" , Hirokazu Takahashi Subject: Re: [PATCH] no buddy bitmap patch : intro and includes [0/2] Message-ID: <1260090000.1097164623@[10.10.2.4]> In-Reply-To: <1097163578.3625.43.camel@localhost> References: <1097163578.3625.43.camel@localhost> X-Mailer: Mulberry/2.2.1 (Linux/x86) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1304 Lines: 31 --Dave Hansen wrote (on Thursday, October 07, 2004 08:39:38 -0700): > On Thu, 2004-10-07 at 08:03, Tolentino, Matthew E wrote: >> >> Followings are patches for removing bitmaps from buddy=20 >> > allocator, against 2.6.9-rc3. >> >> I think this version is much clearer than ones I posted a month ago. >> > ... >> >> If there is unclear point, please tell me. >> > >> > What was the purpose behind this, again? Sorry, has been too long since >> > I last looked. >> >> For one, it avoids the otherwise requisite resizing of the bitmaps=20 >> during memory hotplug operations... > > It also simplifies the nonlinear implementation. The whole reason we > had the lpfn (Linear) stuff was so that the bitmaps could represent a > sparse physical address space in a much more linear fashion. With no > bitmaps, this isn't an issue, and gets rid of a lot of code, and a > *huge* source of bugs where lpfns and pfns are confused for each other. Makese sense on both counts. Would be nice to add the justification to the changelog ;-) M. - 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/