From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f182.google.com (mail-qk0-f182.google.com [209.85.220.182]) by kanga.kvack.org (Postfix) with ESMTP id 8B4D06B0032 for ; Fri, 24 Apr 2015 10:57:43 -0400 (EDT) Received: by qkgx75 with SMTP id x75so31382574qkg.1 for ; Fri, 24 Apr 2015 07:57:43 -0700 (PDT) Received: from e37.co.us.ibm.com (e37.co.us.ibm.com. [32.97.110.158]) by mx.google.com with ESMTPS id e93si11598510qkh.102.2015.04.24.07.57.42 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 24 Apr 2015 07:57:42 -0700 (PDT) Received: from /spool/local by e37.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 24 Apr 2015 08:57:42 -0600 Received: from b03cxnp07028.gho.boulder.ibm.com (b03cxnp07028.gho.boulder.ibm.com [9.17.130.15]) by d03dlp03.boulder.ibm.com (Postfix) with ESMTP id 9C65119D803E for ; Fri, 24 Apr 2015 08:48:44 -0600 (MDT) Received: from d03av05.boulder.ibm.com (d03av05.boulder.ibm.com [9.17.195.85]) by b03cxnp07028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t3OEthPp34472120 for ; Fri, 24 Apr 2015 07:55:43 -0700 Received: from d03av05.boulder.ibm.com (localhost [127.0.0.1]) by d03av05.boulder.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t3OEvd3m009948 for ; Fri, 24 Apr 2015 08:57:39 -0600 Date: Fri, 24 Apr 2015 07:57:38 -0700 From: "Paul E. McKenney" Subject: Re: Interacting with coherent memory on external devices Message-ID: <20150424145738.GZ5561@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20150422000538.GB6046@gmail.com> <20150422131832.GU5561@linux.vnet.ibm.com> <1429756200.4915.19.camel@kernel.crashing.org> <55390EE1.8020304@gmail.com> <20150423193339.GR5561@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Lameter Cc: Austin S Hemmelgarn , Benjamin Herrenschmidt , Jerome Glisse , 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 On Fri, Apr 24, 2015 at 09:12:07AM -0500, Christoph Lameter wrote: > On Thu, 23 Apr 2015, Paul E. McKenney wrote: > > > > > DAX > > > > DAX is a mechanism for providing direct-memory access to > > high-speed non-volatile (AKA "persistent") memory. Good > > introductions to DAX may be found in the following LWN > > articles: > > DAX is a mechanism to access memory not managed by the kernel and is the > successor to XIP. It just happens to be needed for persistent memory. > Fundamentally any driver can provide an MMAPPed interface to allow access > to a devices memory. I will take another look, but others in this thread have called out difficulties with DAX's filesystem nature. Thanx, Paul -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org