Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S947485AbdDTUrY (ORCPT ); Thu, 20 Apr 2017 16:47:24 -0400 Received: from mail-oi0-f45.google.com ([209.85.218.45]:32829 "EHLO mail-oi0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S947178AbdDTUrV (ORCPT ); Thu, 20 Apr 2017 16:47:21 -0400 MIME-Version: 1.0 In-Reply-To: References: <20170418164557.GA7181@obsidianresearch.com> <20170418190138.GH7181@obsidianresearch.com> <20170418210339.GA24257@obsidianresearch.com> <1492564806.25766.124.camel@kernel.crashing.org> <20170419155557.GA8497@obsidianresearch.com> <4899b011-bdfb-18d8-ef00-33a1516216a6@deltatee.com> <20170419173225.GA11255@redhat.com> From: Dan Williams Date: Thu, 20 Apr 2017 13:47:19 -0700 Message-ID: Subject: Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory To: Stephen Bates Cc: Jerome Glisse , Logan Gunthorpe , Jason Gunthorpe , Benjamin Herrenschmidt , Bjorn Helgaas , Christoph Hellwig , Sagi Grimberg , "James E.J. Bottomley" , "Martin K. Petersen" , Jens Axboe , Steve Wise , Max Gurtovoy , Keith Busch , "linux-pci@vger.kernel.org" , linux-scsi , "linux-nvme@lists.infradead.org" , "linux-rdma@vger.kernel.org" , linux-nvdimm , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 354 Lines: 9 On Thu, Apr 20, 2017 at 1:43 PM, Stephen Bates wrote: > >> Yes, this makes sense I think we really just want to distinguish host >> memory or not in terms of the dev_pagemap type. > > I would like to see mutually exclusive flags for host memory (or not) and persistence (or not). > Why persistence? It has zero meaning to the mm.