linux-kernel - Re: [dm-devel] [PATCH v1 0/5] dm: dm-user: New target that proxies BIOs to userspace

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Date:   Tue, 22 Dec 2020 13:32:46 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     josef@...icpanda.com, bvanassche@....org,
        Christoph Hellwig <hch@...radead.org>, snitzer@...hat.com,
        corbet@....net, kernel-team@...roid.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        song@...nel.org, dm-devel@...hat.com,
        linux-kselftest@...r.kernel.org, shuah@...nel.org, agk@...hat.com,
        michael.christie@...cle.com
Subject: Re: [dm-devel] [PATCH v1 0/5] dm: dm-user: New target that proxies
 BIOs to userspace

On Mon, Dec 14, 2020 at 07:00:57PM -0800, Palmer Dabbelt wrote:
> I haven't gotten a whole lot of feedback, so I'm inclined to at least have some
> reasonable performance numbers before bothering with a v2.

FYI, my other main worry beside duplicating nbd is that device mapper
really is a stacked interface that sits on top of other block device.
Turning this into something else that just pipes data to userspace
seems very strange.