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

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Date:	Fri, 07 Aug 2009 09:51:08 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Greg KH <greg@...ah.com>
CC:	Al Boldi <a1426z@...ab.com>, Andi Kleen <andi@...stfloor.org>,
	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

Greg KH wrote:
> On Fri, Aug 07, 2009 at 08:04:08AM +0300, Al Boldi wrote:

>> The question is, how fast can devtmpfs get the device list from the kernel on 
>> bootup?  How much faster than udev?  How much slower than static /dev?
> 
> It's much faster than udev, and is equivalent to a static /dev with the
> exception that the group and permission settings that you are used to.
> udev then needs to come along and make those settings, but that's so
> frickin fast it's amazing.

Earlier in the thread you indicated a 0.5sec speedup over udev.  Is that
really considered "much faster"?

I do agree that it makes sense to do this, but more from an elegance
view than a performance one.

Chris

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