linux-kernel - Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory

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Message-ID: <CAPcyv4i+a_14E58SjFHncyq2O2-zf_PB=aT7k0a-Jc0XsfPapQ@mail.gmail.com>
Date:   Thu, 20 Apr 2017 13:47:19 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Stephen Bates <sbates@...thlin.com>
Cc:     Jerome Glisse <jglisse@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Jens Axboe <axboe@...nel.dk>,
        Steve Wise <swise@...ngridcomputing.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Keith Busch <keith.busch@...el.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...1.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory

On Thu, Apr 20, 2017 at 1:43 PM, Stephen  Bates <sbates@...thlin.com> 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.