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

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Message-ID: <20090812070901.1c66bb67@infradead.org>
Date:	Wed, 12 Aug 2009 07:09:01 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Greg KH <greg@...ah.com>
Cc:	David Dillow <dave@...dillows.org>,
	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>
Subject: Re: [PATCH] Driver Core: devtmpfs - kernel-maintained tmpfs-based
 /dev

On Wed, 12 Aug 2009 06:44:40 -0700
Greg KH <greg@...ah.com> wrote:

> On Wed, Aug 12, 2009 at 08:56:53AM -0400, David Dillow wrote:
> > On Tue, 2009-08-11 at 17:34 -0700, Greg KH wrote:
> > > On Tue, Aug 11, 2009 at 08:25:27PM -0400, David Dillow wrote:
> > > > 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.
> > 
> > What systems would those be?
> 
> Rescue disks, Embedded systems with no local users, servers with no
> local users, etc.  Basically anything that you are only root on, and
> don't care about group permissions.

you're speaking for devtmpfs; the tool we use actually does do group
and owners.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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