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Date: Sat, 15 Apr 2017 22:46:25 -0600 From: Logan Gunthorpe <logang@...tatee.com> To: Benjamin Herrenschmidt <benh@...nel.crashing.org>, Dan Williams <dan.j.williams@...el.com> Cc: Bjorn Helgaas <helgaas@...nel.org>, Jason Gunthorpe <jgunthorpe@...idianresearch.com>, 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>, Stephen Bates <sbates@...thlin.com>, Max Gurtovoy <maxg@...lanox.com>, Keith Busch <keith.busch@...el.com>, linux-pci@...r.kernel.org, linux-scsi <linux-scsi@...r.kernel.org>, linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org, linux-nvdimm <linux-nvdimm@...1.01.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Jerome Glisse <jglisse@...hat.com> Subject: Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory 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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