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

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Date:	Sat, 8 Aug 2009 15:19:16 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	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

On Wed, 5 Aug 2009 11:28:05 -0700
Greg KH <greg@...ah.com> wrote:
> > and Arjan (who is doing about the fastest Linux boot anyone has and
> > has better data than anyone else)
> 
> We did this work based on Arjan's work.  It solves a problem that
> Moblin has as well, which is why Novell is using it for their
> Moblin-based images they are shipping.  It makes things go faster,
> with a simpler userspace codepath, and we have the numbers as have
> been previously posted.

Uhm.

> > plus 
> > 
> > > Eric has shown that just making the nodes is 0.06 seconds with
> > > todays sysfs interface, and there is room for improvement,
> 
> A 0.06 speedup is still a speedup, right?  :)

it really is only this much.
Do we need to post the program again that we use to make all dev nodes
based on sysfs ? Including the flexibility to have non-default owners
and permissions?



 
> Seriously, we saw much more than that, about 0.5 what I last
> remember, Kay?

I would find that hard to believe, there isn't 0.5 on the table
any which way you look at it.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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