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 19:17:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 1 May 2002 19:17:10 -0400 Received: from penguin.e-mind.com ([195.223.140.120]:17460 "EHLO penguin.e-mind.com") by vger.kernel.org with ESMTP id ; Wed, 1 May 2002 19:17:09 -0400 Date: Thu, 2 May 2002 01:17:50 +0200 From: Andrea Arcangeli To: Daniel Phillips , Russell King , linux-kernel@vger.kernel.org Cc: Jesse Barnes Subject: Re: Bug: Discontigmem virt_to_page() [Alpha,ARM,Mips64?] Message-ID: <20020502011750.M11414@dualathlon.random> In-Reply-To: <20020426192711.D18350@flint.arm.linux.org.uk> <20020429153500.B28887@dualathlon.random> <20020501042341.G11414@dualathlon.random> <20020501180547.GA1212440@sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.22.1i X-GnuPG-Key-URL: http://e-mind.com/~andrea/aa.gnupg.asc X-PGP-Key-URL: http://e-mind.com/~andrea/aa.asc Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 01, 2002 at 11:05:47AM -0700, Jesse Barnes wrote: > On Wed, May 01, 2002 at 04:23:41AM +0200, Andrea Arcangeli wrote: > > What's the advantage? And after you can have more than one mem_map, > > after you added this "vector", then each mem_map will match a > > discontigmem pgdat. Tell me a numa machine where there's an hole in the > > middle of a node. The holes are always intra-node, never within the > > nodes themself. So the nonlinear-numa should fallback to the stright > > Just FYI, there _are_ many NUMA machines with memory holes in the > middle of a node. Check out the discontig patch at > http://sf.net/projects/discontig for more info. 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! Andrea