From: Peter Zijlstra <peterz@infradead.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
kay.sievers@vrfy.org, folkert@vanheusden.com, jacmet@sunsite.dk,
linux-kernel@vger.kernel.org
Subject: Re: bdi: register sysfs bdi device only once per queue
Date: Fri, 07 Nov 2008 15:11:18 +0100 [thread overview]
Message-ID: <1226067078.2697.36.camel@twins> (raw)
In-Reply-To: <1225923040.3882.0.camel@macbook.infradead.org>
On Wed, 2008-11-05 at 23:10 +0100, David Woodhouse wrote:
> On Wed, 2008-11-05 at 12:10 -0800, Andrew Morton wrote:
> > > > Devices which share the same queue, like floppies and mtd devices,
> > > > get registered multiple times in the bdi interface, but bdi accounts
> > > > only the last registered device of the devices sharing one queue.
> > >
> > > David, is there any reason the mtd devices do this?
> >
> > [tap tap - is this thing turned on?]
>
> No particular reason. It's been done that way since the dawn of time,
> when it was perfectly normal. Nobody's yet bothered to change that, when
> changing the rules.
It looks to be the consequence of using one queue for a bunch of devices
(which seems odd), and its all tied into this translation layer which
starts a thread per queue.
Do you want me to rip this up and make it do one queue/thread per
device? - seems invasive...
prev parent reply other threads:[~2008-11-07 14:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-03 15:53 bdi: register sysfs bdi device only once per queue Kay Sievers
2008-11-03 16:08 ` Peter Zijlstra
2008-11-05 20:10 ` Andrew Morton
2008-11-05 22:10 ` David Woodhouse
2008-11-05 22:21 ` Peter Zijlstra
2008-11-07 14:11 ` Peter Zijlstra [this message]
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