linux-kernel - Re: [PATCH] driver-core: devtmpfs - driver core maintained /dev tmpfs

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Date:	Mon, 4 May 2009 18:20:11 +0200
From:	Lars Marowsky-Bree <lmb@...e.de>
To:	Kay Sievers <kay.sievers@...y.org>,
	Alan Jenkins <sourcejedi.lkml@...glemail.com>
Cc:	Michael Riepe <michael.riepe@...glemail.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <greg@...ah.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jan Blunck <jblunck@...e.de>
Subject: Re: [PATCH] driver-core: devtmpfs - driver core maintained /dev
	tmpfs

On 2009-05-02T23:47:03, Kay Sievers <kay.sievers@...y.org> wrote:

> It is not about missing events, it is about the bootstrap step we
> would like to avoid. Buffering events, or reading all device
> information from sysfs at this stage introduces a hard checkpoint,
> where we need to bring a process up process these events and create
> nodes for them. Only after that we can start other things in userspace
> which depend on a working /dev, and with the kernel populated one, we
> can just go ahead.

So if udevd was present before the kernel started scanning devices this
would not be as much of a problem, would it? 

(Couldn't udevd trigger the device scan? Could it be started so early as
for this not to matter?)

And isn't part of the problem that you have a choke point in the
dependency graph - namely "/dev working" as a predicate for running
certain services/scripts - instead of more fine-grained dependencies for
just the devices they need?


Regards,
    Lars

-- 
SuSE Labs, OPS Engineering, Novell, Inc.
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde

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