linux-kernel - Re: [PATCH v8 13/13] nvmet: Optionally use PCI P2P memory

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Message-ID: <587bb6bd-ec07-62ac-6442-cbc7892df37f@deltatee.com>
Date:   Mon, 1 Oct 2018 17:43:00 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Sagi Grimberg <sagi@...mberg.me>, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-rdma@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-block@...r.kernel.org
Cc:     Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Keith Busch <keith.busch@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Christian König <christian.koenig@....com>,
        Jens Axboe <axboe@...nel.dk>,
        Steve Wise <swise@...ngridcomputing.com>
Subject: Re: [PATCH v8 13/13] nvmet: Optionally use PCI P2P memory



On 01/10/18 04:23 PM, Sagi Grimberg wrote:
>> I did not realize the namespace would be available at this time. I guess
>> I can give this a try, but it's going to be a fairly big change from
>> what's presented here... Though, I agree it'll probably be an
>> improvement.
> 
> Thanks, if it turns out to create to much of a churn, we could defer
> that to a later stage, but we can at least document it.

Yeah, it's going to create a bunch of churn, but it's probably worth
doing before merging because I think it will remove a bunch of
complexity (ie. the need for the whole p2p client infrastructure because
we now only need to worry about only one namespace at a time, instead of
needing to find a p2p device that works with all namespaces at once).

I'll try to get a v9 with this change published in the next day or two.

Logan