From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 07 Oct 2004 08:57:04 -0700 From: "Martin J. Bligh" 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: owner-linux-mm@kvack.org Return-Path: 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 List-ID: --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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: aart@kvack.org