From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bart Van Assche <bvanassche@acm.org>
Subject: Re: [PATCH v2] block: BFQ default for single queue devices
Date: Wed, 17 Oct 2018 07:48:33 -0700
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To: Jan Kara <jack@suse.cz>, Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>, Ulf Hansson <ulf.hansson@linaro.org>, Paolo Valente <paolo.valente@linaro.org>, Damien Le Moal <Damien.LeMoal@wdc.com>, Artem Bityutskiy <dedekind1@gmail.com>, Richard Weinberger <richard@nod.at>, Linus Walleij <linus.walleij@linaro.org>, Jonathan Corbet <corbet@lwn.net>, linux-mmc <linux-mmc@vger.kernel.org>, Adrian Hunter <adrian.hunter@intel.com>, Oleksandr Natalenko <oleksandr@natalenko.name>, linux-block <linux-block@vger.kernel.org>, Mark Brown <broonie@kernel.org>, linux-mtd@lists.infradead.org, Pavel Machek <pavel@ucw.cz>, Johannes Thumshirn <jthumshirn@suse.de>, Alan Cox <gnomes@lxorguk.ukuu.org.uk>
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On 10/17/18 3:05 AM, Jan Kara wrote:
> Well, the problem with this is that big distro people really don't care
> much because they already use udev for tuning the IO scheduler. So whatever
> defaults the kernel is going to pick likely won't be seen by distro
> customers. Embedded people seem to be driving this effort because they
> either don't run udev or they feel not all their teams building new
> products have enough expertise to come up with a proper set of rules...

What's missing in this discussion is a definition of "embedded system". 
Is that a system like a streaming player for TV channels that neither 
has a keyboard nor a display or a system that can run multiple apps 
simultaneously like a smartphone? I think the difference matters because 
some embedded devices hardly do any background I/O nor load any 
executable code from storage after boot. So at least for some embedded 
devices the problem discussed in this e-mail thread does not exist.

Bart.

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