Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 3 Oct 2001 20:38:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 3 Oct 2001 20:38:11 -0400 Received: from garrincha.netbank.com.br ([200.203.199.88]:5892 "HELO netbank.com.br") by vger.kernel.org with SMTP id ; Wed, 3 Oct 2001 20:37:57 -0400 Date: Wed, 3 Oct 2001 21:38:07 -0300 (BRST) From: Rik van Riel X-X-Sender: To: Rob Landley Cc: Alexander Viro , Christoph Hellwig , , Linus Torvalds Subject: Re: Whining about 2.5 (was Re: [PATCH] Re: bug? in using generic read/write functions to read/write block devices in 2.4.11-pre2) In-Reply-To: <01100315551100.00728@localhost.localdomain> Message-ID: X-spambait: aardvark@kernelnewbies.org X-spammeplease: aardvark@nl.linux.org MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 3 Oct 2001, Rob Landley wrote: > (Oh, and what's the deal with "classzones"? Linus told Andrea > classzones were a dumb idea, and we'd regret it when we tried to > inflict NUMA architecture on 2.5, but then went with Andrea's VM > anyway, which I thought was based on classzones... Was that ever > resolved? What the problem avoided? What IS a classzone, anyway? > I'd be happy to RTFM, if anybody could tell me where TF the M is > hiding...) Classzones used to be a superset of the memory zones, so if you have memory zones A, B and C you'd have classzone Ac consisting of memory zone A, classzone Bc = {A + B} and Cc = {A + B + C}. This gives obvious problems for NUMA, suppose you have 4 nodes with zones 1A, 1B, 1C, 2A, 2B, 2C, 3A, 3B, 3C, 4A, 4B and 4C. Putting together classzones for these isn't quite obvious and memory balancing will be complex ;) Of course, nobody knows the exact definitions of classzones in the new 2.4 VM since it's completely undocumented; lets hope Andrea will document his code or we'll see a repeat of the development chaos we had with the 2.2 VM... cheers, Rik -- DMCA, SSSCA, W3C? Who cares? http://thefreeworld.net/ (volunteers needed) http://www.surriel.com/ http://distro.conectiva.com/ - 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/