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

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Message-ID: <20090429120827.GI8633@ZenIV.linux.org.uk>
Date:	Wed, 29 Apr 2009 13:08:28 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mike Galbraith <efault@....de>,
	Martin Knoblauch <knobi@...bisoft.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	tigran aivazian <tigran@...azian.fsnet.co.uk>
Subject: Re: Analyzed/Solved: Booting 2.6.30-rc2-git7 very slow

On Wed, Apr 29, 2009 at 01:17:55AM -0700, Andrew Morton wrote:

> > > > Questions remains: was this intentional? It breaks existing userspace and should therefore be considered a regression - right? On the other hand, it will never be a problem for RHEL-4/5 kernels, unless the change in 2.6.29 gets backported. Any ideas?
> > > 
> > > afaik that was unintentional and was probably a mistake.
> > > 
> > > I wonder how we did that.
> > 
> > <paste>
> > > [hotplug]# grep sysfs /proc/mounts
> > > none /sys sysfs rw,relatime 0 0
> > > /sys /sys sysfs rw,relatime 0 0
> > 
> > ___(I wonder how the heck that is accomplished)
> 
> Beats me.  I'm not seeing likely changes in fs/proc/base.c or around
> show_mountinfo().  Maybe sysfs broke in an ingenious way.  (hopefully
> cc's viro).

Er...  Somebody mounting sysfs twice?  From some init script and from
/etc/fstab, perhaps?  That definitely looks like two mount(2) had to
have been done to cause that...
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