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

From: Andrew Morton
Date: Wed May 27 2009 - 16:32:27 EST

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