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

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Message-ID: <20090501140108.GA20846@kroah.com>
Date:	Fri, 1 May 2009 07:01:08 -0700
From:	Greg KH <greg@...ah.com>
To:	Chris Wedgwood <cw@...f.org>
Cc:	Kay Sievers <kay.sievers@...y.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 Thu, Apr 30, 2009 at 11:57:54PM -0700, Chris Wedgwood wrote:
> On Thu, Apr 30, 2009 at 03:23:42PM +0200, Kay Sievers wrote:
> 
> > Devtmpfs lets the kernel create a tmpfs very early at kernel
> > initialization, before any driver core device is registered. Every
> > device with a major/minor will have a device node created in this
> > tmpfs instance. After the rootfs is mounted by the kernel, the
> > populated tmpfs is mounted at /dev. In initramfs, it can be moved to
> > the manually mounted root filesystem before /sbin/init is executed.
> 
> Why can't the initramfs create /dev and populate it?

Right now it does, and it takes about 1-2 seconds to do so depending on
the hardware.

Which is over double the time it takes to boot the kernel entirely these
days, so it is quite noticable.

thanks,

greg k-h
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