From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [PATCH] no buddy bitmap patch : intro and includes [0/2] From: Dave Hansen In-Reply-To: References: Content-Type: text/plain Message-Id: <1097163578.3625.43.camel@localhost> Mime-Version: 1.0 Date: Thu, 07 Oct 2004 08:39:38 -0700 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Matthew E Tolentino Cc: "Martin J. Bligh" , Hiroyuki KAMEZAWA , Linux Kernel ML , linux-mm , lhms , Andrew Morton , William Lee Irwin III , "Luck, Tony" , Hirokazu Takahashi List-ID: 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. -- Dave -- 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