From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261322AbTD1W2T (ORCPT ); Mon, 28 Apr 2003 18:28:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261367AbTD1W2T (ORCPT ); Mon, 28 Apr 2003 18:28:19 -0400 Received: from holomorphy.com ([66.224.33.161]:23496 "EHLO holomorphy") by vger.kernel.org with ESMTP id S261322AbTD1W2S (ORCPT ); Mon, 28 Apr 2003 18:28:18 -0400 Date: Mon, 28 Apr 2003 15:40:25 -0700 From: William Lee Irwin III To: "Martin J. Bligh" Cc: Dave Hansen , Andi Kleen , Carl-Daniel Hailfinger , Henti Smith , linux-kernel@vger.kernel.org, lse-tech@lists.sourceforge.net Subject: Re: [Lse-tech] Re: maximum possible memory limit .. Message-ID: <20030428224025.GW30441@holomorphy.com> Mail-Followup-To: William Lee Irwin III , "Martin J. Bligh" , Dave Hansen , Andi Kleen , Carl-Daniel Hailfinger , Henti Smith , linux-kernel@vger.kernel.org, lse-tech@lists.sourceforge.net References: <20030424200524.5030a86b.bain@tcsn.co.za> <3EAD27B2.9010807@gmx.net> <20030428141023.GC4525@Wotan.suse.de> <3EAD44BF.30808@gmx.net> <20030428151648.GF4525@Wotan.suse.de> <3EAD5C44.103@us.ibm.com> <483810000.1051549109@[10.10.2.4]> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <483810000.1051549109@[10.10.2.4]> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org At some point in the past, Dave Hansen wrote: >> Each one of those needs to be audited before pgcl is acceptable to a >> wide audience. We've already seen plenty of stuff that breaks. ext2/3 >> look to be all right, but I know that JFS is broken. On Mon, Apr 28, 2003 at 09:58:31AM -0700, Martin J. Bligh wrote: > Well, the upside is that he's only doing s/PAGE_SIZE/MMU_PAGESIZE/ > in most places, which are normally both 4K. So it will have no effect > whatsoever unless you explicitly turn it on. The JFS issue is general to PAGE_SIZE > 4KB, pgcl-induced or not. shaggy et al are already aware of it. Most of the driver stuff I've seen is ioremap() of O(PAGE_SIZE) which just gets denied so it fails to probe. IDE was worse (as usual), and AGP needed an unusual amount of tweaking, which probably will be typical for the graphics drivers in general. Block stuff seems to be well-abstracted, so basically the only semantically significant needed fix for block drivers is for 512*q->max_len < PAGE_SIZE (not yet done). -- wli