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

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To: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
From: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Date: Sat, 15 Apr 2017 22:46:25 -0600
Cc: Bjorn Helgaas <helgaas@xxxxxxxxxx>, Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Sagi Grimberg <sagi@xxxxxxxxxxx>, "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxxxx>, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx>, Stephen Bates <sbates@xxxxxxxxxxxx>, Max Gurtovoy <maxg@xxxxxxxxxxxx>, Keith Busch <keith.busch@xxxxxxxxx>, linux-pci@xxxxxxxxxxxxxxx, linux-scsi <linux-scsi@xxxxxxxxxxxxxxx>, linux-nvme@xxxxxxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, linux-nvdimm <linux-nvdimm@xxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Jerome Glisse <jglisse@xxxxxxxxxx>
In-reply-to: <1492311719.25766.37.camel@kernel.crashing.org>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.6.0


On 15/04/17 09:01 PM, Benjamin Herrenschmidt wrote:
> Are ZONE_DEVICE pages identifiable based on the struct page alone ? (a
> flag ?)

Well you can't use ZONE_DEVICE as an indicator. They may be regular RAM,
(eg. pmem). It would need a separate flag indicating it is backed by iomem.

Logan

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References:
- [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Logan Gunthorpe
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Benjamin Herrenschmidt
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Logan Gunthorpe
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Benjamin Herrenschmidt
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Logan Gunthorpe
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Bjorn Helgaas
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Jason Gunthorpe
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Benjamin Herrenschmidt
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Logan Gunthorpe
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Bjorn Helgaas
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Benjamin Herrenschmidt
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Logan Gunthorpe
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Dan Williams
- Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
  - From: Benjamin Herrenschmidt

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