linux-kernel - Re: [patch 00/13] devtmpfs patches

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Message-ID: <20090511073053.4628b28c@infradead.org>
Date:	Mon, 11 May 2009 07:30:53 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Fabio Comolli <fabio.comolli@...il.com>,
	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch 00/13] devtmpfs patches

On Mon, 11 May 2009 16:14:28 +0200
Kay Sievers <kay.sievers@...y.org> wrote:

> On Mon, May 11, 2009 at 15:10, Alan Cox <alan@...rguk.ukuu.org.uk>
> wrote:
> >> And I did, and it's obvious that creating a single file along with
> >> the ~10 we already create in /sys, instead of running through /sys
> >> or /proc later and reconstruct what we missed, is always, and in
> >> every case faster and simpler. It gets rid of a bunch of things we
> >> need to
> >
> > Arjan's numbers for sysfs are 0.06 seconds if I remember the mail
> > correctly. That doesn't account for any meaningful speedup.
> 
> Sure it does. It is great, and it started a huge effort for many
> people to think about the current way to do it. It is very welcome and
> it counts a lot, and there is no doubt, that most of the gains we get
> today are due to Arjans work in that area.
> 
> But he does not use an initramfs, and distros insist to do that. And
> that basically means you need to prepare /dev two times, and also prep

eh why?

this is the part I'm missing.
Make /dev in the initramfs, then bind-mount-move it to its final
location later. 

you ever only need to fill your tmpfs /dev once. initramfs or not.
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