From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934386AbbDVPUN (ORCPT ); Wed, 22 Apr 2015 11:20:13 -0400 Received: from resqmta-po-01v.sys.comcast.net ([96.114.154.160]:46300 "EHLO resqmta-po-01v.sys.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755660AbbDVPUK (ORCPT ); Wed, 22 Apr 2015 11:20:10 -0400 Date: Wed, 22 Apr 2015 10:20:08 -0500 (CDT) From: Christoph Lameter X-X-Sender: cl@gentwo.org To: "Paul E. McKenney" cc: Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, linux-mm@kvack.org, jglisse@redhat.com, mgorman@suse.de, aarcange@redhat.com, riel@redhat.com, airlied@redhat.com, aneesh.kumar@linux.vnet.ibm.com, Cameron Buschardt , Mark Hairgrove , Geoffrey Gerfin , John McKenna , akpm@linux-foundation.org Subject: Re: Interacting with coherent memory on external devices In-Reply-To: <20150422005757.GP5561@linux.vnet.ibm.com> Message-ID: References: <20150421214445.GA29093@linux.vnet.ibm.com> <1429663372.27410.75.camel@kernel.crashing.org> <20150422005757.GP5561@linux.vnet.ibm.com> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 21 Apr 2015, Paul E. McKenney wrote: > Ben will correct me if I am wrong, but I do not believe that we are > looking for persistent memory in this case. DAX is way of mapping special memory into user space. Persistance is one possible use case. Its like the XIP that you IBMers know from z/OS or the 390 mainframe stuff. Its been widely discussed at memory managenent meetings. A bit surprised that this is not a well known thing.