linux-kernel - Re: slow down printk during boot.

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Date:	Thu, 5 Jul 2007 21:55:58 -0400
From:	Dave Jones <davej@...hat.com>
To:	Bodo Eggert <7eggert@....de>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: slow down printk during boot.

On Fri, Jul 06, 2007 at 03:50:11AM +0200, Bodo Eggert wrote:
 > Dave Jones <davej@...hat.com> wrote:
 > 
 > > This patch from Randy has proven quite useful from time to time,
 > > and has been in Fedora kernels for a while for that reason.
 > > I fixed up some checkpatch warnings, and rediffed it a bunch
 > > of times, Randy did the heavy lifting.
 > > 
 > > ---
 > > 
 > > This one delays each printk() during boot by a variable time
 > > (from kernel command line), while system_state == SYSTEM_BOOTING.
 > > Caveat:  it's not terribly SMP safe or SMP nice.
 > > Any ideas for improvements (esp. in the SMP area) are appreciated.
 > 
 > I just created a different patch, which replaces the panic with one that
 > does allow scrolling and reading the messages. Maybe that would be the
 > better approach ...

I've used the 'slow down the printk' patch in situations where we
haven't panic'd, but silently rebooted instantly or hung with
a black screen.

	Dave

-- 
http://www.codemonkey.org.uk
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