linux-kernel - Re: [PATCH] Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev

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Message-ID: <20090812003433.GA25392@kroah.com>
Date:	Tue, 11 Aug 2009 17:34:33 -0700
From:	Greg KH <greg@...ah.com>
To:	David Dillow <dave@...dillows.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Greg KH <gregkh@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Jan Blunck <jblunck@...e.de>, Harald Hoyer <harald@...hat.com>,
	Scott James Remnant <scott@...ntu.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] Driver Core: devtmpfs - kernel-maintained tmpfs-based
 /dev

On Tue, Aug 11, 2009 at 08:25:27PM -0400, David Dillow wrote:
> On Tue, 2009-08-11 at 16:55 +0200, Andi Kleen wrote:
> > > No, not really. It isn't hard to make a static /dev, or a rescue initrd
> > > for the cases with dynamic device numbers.
> > 
> > There's a world between strictly controlled embedded and fully general
> > distributions.
> 
> Sure, and I've acknowledged that. But it doesn't mean this needs a
> kernel solution.
> 
> > I want a dynamic /dev, but a fast one that doesn't need initrd or
> > slows down booting.
> 
> So use Eric/Arjan's program that does it in 60ms -- you get a
> dynamic /dev, no initrd, fast boot, and no kernel changes required.

Their program only handles it for a reconstruction of /dev based on
sysfs one time at boot.  It does not handle things that are added or
discovered by the system after that, you need udev for that.

So it's a great hack for boot time stuff, but not a complete /dev
management replacement like this code can be for numerous systems.

thanks,

greg k-h
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