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

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Date:	Thu, 6 Aug 2009 20:06:16 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	Andi Kleen <andi@...stfloor.org>, Greg KH <greg@...ah.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	Kay Sievers <kay.sievers@...y.org>,
	Jan Blunck <jblunck@...e.de>, gregkh@...e.de,
	Harald Hoyer <harald@...hat.com>,
	Scott James Remnant <scott@...ntu.com>
Subject: Re: [PATCH] Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev

Andi Kleen wrote:
> Greg KH <greg@...ah.com> writes:
> > It makes the userspace boot process much simpler and easier to maintain,
> > as well as providing a way to handle rescue disks and images trivially,
> > and it makes the kernel _less_ dependant on the early userspace bootup
> > scripts.
>
> As a initrd less kernel user I can really only agree: getting rid
> of the udev-in-initrd requirement would be a big step forward
> in usability. Typically I always have to pre populate
> a on disk /dev manually first to get my kernels to boot.

Oh good, I thought I was the only one doing that.

The reason I don't like udev is that it's just to slow; something like a 5-10s 
delay on each boot.  No idea why it should be so slow, but it's probably 
probing the kernel for all available devices at boot, when it could be much 
quicker by probing for the device on access.


Thanks!

--
Al

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