linux-kernel - Re: [RFC PATCH 00/28] Removing struct page from P2PDMA

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Message-ID: <20190626205458.GA6392@ziepe.ca>
Date:   Wed, 26 Jun 2019 17:54:58 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Logan Gunthorpe <logang@...tatee.com>,
        Christoph Hellwig <hch@....de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-pci@...r.kernel.org, linux-rdma <linux-rdma@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [RFC PATCH 00/28] Removing struct page from P2PDMA

On Wed, Jun 26, 2019 at 01:39:01PM -0700, Dan Williams wrote:
> Hmm, that sounds like dev_pagemap without the pages.

Yes, and other page related overhead. Maybe both ideas can exist in
the pagemap code?

All that is needed here is to map a bar phys_addr_t to some 'bar info'
that helps the mapping.

Jason