linux-kernel - Re: [dm-devel] [PATCH 2/2] dm-thin: Allow specifying an offset

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Message-ID: <Y+J7QrS7JqeNqbot@itl-email>
Date:   Tue, 7 Feb 2023 11:24:26 -0500
From:   Demi Marie Obenour <demi@...isiblethingslab.com>
To:     Joe Thornber <thornber@...hat.com>
Cc:     Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>, dm-devel@...hat.com,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, linux-kernel@...r.kernel.org
Subject: Re: [dm-devel] [PATCH 2/2] dm-thin: Allow specifying an offset

On Tue, Feb 07, 2023 at 03:03:57PM +0000, Joe Thornber wrote:
> Nack.  I'm not building a linear target into every other target.  Layering
> targets is simple.

It also introduces a performance penalty, which is measurable on some
workloads.  Even dm-linear is not free.  The crypt target also has this
feature, so there is precedent.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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