Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759854AbYBZHVt (ORCPT ); Tue, 26 Feb 2008 02:21:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754367AbYBZHVm (ORCPT ); Tue, 26 Feb 2008 02:21:42 -0500 Received: from fwil.voltaire.com ([193.47.165.2]:28889 "EHLO exil.voltaire.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753362AbYBZHVl (ORCPT ); Tue, 26 Feb 2008 02:21:41 -0500 Date: Tue, 26 Feb 2008 09:21:37 +0200 To: Nick Piggin Cc: Robin Holt , steiner@sgi.com, Andrea Arcangeli , Peter Zijlstra , linux-mm@kvack.org, Izik Eidus , Kanoj Sarcar , Roland Dreier , linux-kernel@vger.kernel.org, Avi Kivity , kvm-devel@lists.sourceforge.net, daniel.blueman@quadrics.com, general@lists.openfabrics.org, akpm@linux-foundation.org, Christoph Lameter Subject: Re: [ofa-general] Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem) Message-ID: <20080226072137.GD26611@minantech.com> References: <20080215064859.384203497@sgi.com> <200802211520.03529.nickpiggin@yahoo.com.au> <20080221105838.GJ11391@sgi.com> <200802261711.33213.nickpiggin@yahoo.com.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200802261711.33213.nickpiggin@yahoo.com.au> From: glebn@voltaire.com (Gleb Natapov) X-OriginalArrivalTime: 26 Feb 2008 07:21:37.0648 (UTC) FILETIME=[396CF700:01C87848] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1014 Lines: 20 On Tue, Feb 26, 2008 at 05:11:32PM +1100, Nick Piggin wrote: > > You are missing one point here. The MPI specifications that have > > been out there for decades do not require the process use a library > > for allocating the buffer. I realize that is a horrible shortcoming, > > but that is the world we live in. Even if we could change that spec, > > Can you change the spec? Not really. It will break all existing codes. MPI-2 provides a call for memory allocation (and it's beneficial to use this call for some interconnects), but many (most?) applications are still written for MPI-1 and those that are written for MPI-2 mostly uses the old habit of allocating memory by malloc(), or even use stack or BSS memory for communication buffer purposes. -- Gleb. -- 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/