linux-kernel - Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow

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Message-Id: <20090527133125.c36381b5.akpm@linux-foundation.org>
Date:	Wed, 27 May 2009 13:31:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Martin Knoblauch <knobi@...bisoft.de>
Cc:	efault@....de, viro@...IV.linux.org.uk, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kay.sievers@...y.org,
	shemminger@...tta.com, jbarnes@...tuousgeek.org, matthew@....cx,
	mike.miller@...com
Subject: Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow

On Wed, 27 May 2009 04:25:57 -0700 (PDT)
Martin Knoblauch <knobi@...bisoft.de> wrote:

>  FWIW, I compiled the CCISS driver into the kernel. This makes the second "/sys" line in /proc/mounts go away, dmesg attached. But does it prove anything? The initialization of the CCISS hardware now happens about 2 seconds earlier in the bootup sequence. Does this hint to a problem with CCISS, or just confirms that the whole issue is really timing dependent? Anyway, I add Mike to CC.
> 

It seems that the PCI change caused timing changes which triggered a
udev/sysfs/whatever problem, which manifests as the duplicated
/proc/mounts entry to turn up.

What we don't know (afaik) is why the kernel permitted two entries in
/proc/mounts.  That might be a bug.

It could be that if dual /proc/mounts problem gets fixed, everything
works OK - by intent or by accident, the userspace startup scripts may
then work acceptably.

I think Al asked you a few questions around the behaviour of mount(8)
and the mount syscall, so we could delve further into why /proc/mounts
is getting mucked up.  Did you end up running those tests?

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