Subject: Re: udev is too slow creating devices
From: Ian Campbell <icampbell@arcom.com>
To: "Giacomo A. Catenazzi" <cate@debian.org>
Cc: Greg KH <greg@kroah.com>, "Marco d'Itri" <md@Linux.IT>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Organization: Arcom Control Systems
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Date: Wed, 15 Sep 2004 15:36:06 +0100
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On Wed, 2004-09-15 at 14:55, Giacomo A. Catenazzi wrote:
> Old behaviour (modprobe "waits" for the creation of device):

I wonder if it would be feasible for modprobe (or some other utility) to
have a new option: --wait-for=/dev/something which would wait for the
device node to appear. Perhaps by:
	- some mechanism based on HAL, DBUS, whatever
	- dnotify on /dev/?
	- falling back to spinning and waiting.

The first two sound nice since they avoid spinning and sleeping for a
second at a time, which just adds to the delay.

In addition a timeout of some sort to give an upper bound would seem
like a good idea.

Ian.

-- 
Ian Campbell, Senior Design Engineer
                                        Web: http://www.arcom.com
Arcom, Clifton Road, 			Direct: +44 (0)1223 403 465
Cambridge CB1 7EA, United Kingdom	Phone:  +44 (0)1223 411 200

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