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

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Date:	Wed, 29 Apr 2009 10:28:23 -0700 (PDT)
From:	Martin Knoblauch <knobi@...bisoft.de>
To:	Al Viro <viro@...IV.linux.org.uk>, Mike Galbraith <efault@....de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"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


----- Original Message ----

> From: Al Viro <viro@...IV.linux.org.uk>
> To: Mike Galbraith <efault@....de>
> Cc: Andrew Morton <akpm@...ux-foundation.org>; Martin Knoblauch <knobi@...bisoft.de>; Rafael J. Wysocki <rjw@...k.pl>; linux-kernel@...r.kernel.org; tigran aivazian <tigran@...azian.fsnet.co.uk>
> Sent: Wednesday, April 29, 2009 4:34:03 PM
> Subject: Re: Analyzed/Solved: Booting 2.6.30-rc2-git7 very slow
> 
> On Wed, Apr 29, 2009 at 04:18:45PM +0200, Mike Galbraith wrote:
> > > /etc/fstab, perhaps?  That definitely looks like two mount(2) had to
> > > have been done to cause that...
> > 
> > Yeah, but how does one go about doing that?
> > 
> > Using mount -f, I can convince mount to succeed, but I still have only
> > one entry in /proc/mounts, despite what my mount binary imagines.
> 
> Huh?
>        -f     Causes  everything to be done except for the actual system call;
>               if it's not obvious, this ``fakes'' mounting  the  file  system.
>               This  option is useful in conjunction with the -v flag to deter-
>               mine what the mount command is trying to do. It can also be used
>               to add entries for devices that were mounted earlier with the -n
> 
> What are you talking about?
> 
> The interesting part is why mount(2) doesn't fail with -EBUSY on that
> overmounting.  Is there anything else mounted on /sys?  That, or any
> interesting patches applied to the tree (fs/sysfs/mount.c, fs/namespace.c)

 In my 2.6.30-rc3-git2 there is definitely nothing interesting, just my NFS readahead patch. But that touches nothing near sysfs.  And my 2.6.29 test-boot was from a plain build.

Cheers
Martin

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