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

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Message-ID: <926930.45651.qm@web32602.mail.mud.yahoo.com>
Date:	Thu, 30 Apr 2009 02:12:00 -0700 (PDT)
From:	Martin Knoblauch <knobi@...bisoft.de>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....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


----- Original Message ----

> From: Al Viro <viro@...IV.linux.org.uk>
> To: Martin Knoblauch <knobi@...bisoft.de>
> Cc: Andrew Morton <akpm@...ux-foundation.org>; Mike Galbraith <efault@....de>; Rafael J. Wysocki <rjw@...k.pl>; linux-kernel@...r.kernel.org; tigran aivazian <tigran@...azian.fsnet.co.uk>
> Sent: Wednesday, April 29, 2009 8:10:41 PM
> Subject: Re: Analyzed/Solved: Booting 2.6.30-rc2-git7 very slow
> 
> On Wed, Apr 29, 2009 at 10:51:35AM -0700, Martin Knoblauch wrote:
> > 2.6.30-rc3-git2:
> > 
> > rootfs / rootfs rw 0 0
> > /proc /proc proc rw,relatime 0 0
> > none /sys sysfs rw,relatime 0 0
> > none /dev tmpfs rw,relatime,mode=755 0 0
> > /dev/root / ext3 rw,relatime,errors=continue,data=writeback 0 0
> > none /dev tmpfs rw,relatime,mode=755 0 0
> > /proc /proc proc rw,relatime 0 0
> > /proc/bus/usb /proc/bus/usb usbfs rw,relatime 0 0
> > /sys /sys sysfs rw,relatime 0 0
> > none /dev/pts devpts rw,relatime,gid=5,mode=620 0 0
> > /dev/cciss/c0d0p1 /boot ext3 rw,relatime,errors=continue,data=writeback 0 0
> > none /dev/shm tmpfs rw,relatime 0 0
> > /dev/cciss/c0d0p4 /scratch ext2 rw,noatime,errors=continue 0 0
> > none /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0
> > sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
> 
> Cute...  I wonder how that second mount(2) managed to succeed.  Could you
> check what explicit mounting of sysfs on that point *again* does?
Hi Al,

 by now I know a bit more. Starting with 2.6.29, the

none /sys sysfs rw 0 0

line is already in /proc/mounts when entering userspace. So I guess it comes out of my initrd. Again, what changed?

Cheers
Martin

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