From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 1 May 2002 20:21:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 1 May 2002 20:21:46 -0400 Received: from samba.sourceforge.net ([198.186.203.85]:27811 "HELO lists.samba.org") by vger.kernel.org with SMTP id ; Wed, 1 May 2002 20:21:45 -0400 Date: Thu, 2 May 2002 10:20:11 +1000 From: Anton Blanchard To: Andrea Arcangeli Cc: Daniel Phillips , Russell King , linux-kernel@vger.kernel.org, Jesse Barnes Subject: Re: Bug: Discontigmem virt_to_page() [Alpha,ARM,Mips64?] Message-ID: <20020502002010.GA14243@krispykreme> In-Reply-To: <20020426192711.D18350@flint.arm.linux.org.uk> <20020429153500.B28887@dualathlon.random> <20020501042341.G11414@dualathlon.random> <20020501180547.GA1212440@sgi.com> <20020502011750.M11414@dualathlon.random> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.28i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > so ia64 is one of those archs with a ram layout with huge holes in the > middle of the ram of the nodes? I'd be curious to know what's the > hardware advantage of designing the ram layout in such a way, compared > to all other numa archs that I deal with. Also if you know other archs > with huge holes in the middle of the ram of the nodes I'd be curious to > know about them too. thanks for the interesting info! >>From arch/ppc64/kernel/iSeries_setup.c: * The iSeries may have very large memories ( > 128 GB ) and a partition * may get memory in "chunks" that may be anywhere in the 2**52 real * address space. The chunks are 256K in size. Also check out CONFIG_MSCHUNKS code and see why I'd love to see a generic solution to this problem. Anton