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Message-ID: <CAB0TPYGczqoDz=ReM75cYc4hbS58V-a4m_qJ8GoAoWtepXTWNA@mail.gmail.com>
Date: Thu, 15 Aug 2019 15:49:58 +0100
From: Martijn Coenen <maco@...roid.com>
To: Bart Van Assche <bvanassche@....org>
Cc: axboe@...nel.dk, linux-block@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>,
Greg KH <gregkh@...uxfoundation.org>, kernel-team@...roid.com,
Narayan Kamath <narayan@...gle.com>,
Dario Freni <dariofreni@...gle.com>,
Nikita Ioffe <ioffe@...gle.com>,
Jiyong Park <jiyong@...gle.com>,
Martijn Coenen <maco@...gle.com>
Subject: Re: [PATCH] RFC: loop: Avoid calling blk_mq_freeze_queue() when possible.
On Wed, Aug 14, 2019 at 4:29 PM Bart Van Assche <bvanassche@....org> wrote:
> Hi Martijn,
>
> Is the loop driver used in Android Q to make a file on a filesystem
> visible as a block device or rather to make a subset of a block device
> visible as a block device? In the latter case, have you considered to
> use the dm-linear driver instead? I expect that the overhead per I/O of
> dm-linear will be lower than that of the loop driver.
Hi Bart,
In this case we're using the loop driver to make a file on the
filesystem visible as a block device (in the file is a filesystem we
want to mount), so unfortunately dm-linear is not an option.
Best,
Martijn
>
> Bart.
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