linux-kernel - Re: [PATCH] console logging detour via printk

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Message-ID: <20100501204131.4c7aeae4@lxorguk.ukuu.org.uk>
Date:	Sat, 1 May 2010 20:41:31 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Samo Pogacnik <samo_pogacnik@....net>
Cc:	linux-embedded <linux-embedded@...r.kernel.org>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] console logging detour via printk

> The distros have no problem logging complete console output into log
> files or over the network, because they simply do not do it at least for
> the initrd part of the boot process (i'd be glad, if i'm wrong). 

I'd have to double check - but its trivial to move the log if so.

> > I suspect what you actually need for such logging might be to write a
> > very simple tty driver whose write method is implemented as printk. That
> > works in the general case and doesn't require hacking up the code
> > everywhere else.
> 
> Looks to me that some kernel code is welcome:)?

I really don't see the point but if you must do it then doing it as its
own driver would at least avoid making a mess in the rest of the kernel,
at which point it becomes less of a problem

> > However given your init stuff can trivially use openpty to set up a logged
> > console I am not sure I see the point in doing this in kernel in the
> > first place.
> > 
> 
> As said above, how to bridge kernel boot start and logging daemon
> start-up without kernel help, especially when initrd is in the way? imho
> it would be too complicated.

Put the logging start up in the initrd, its just a ramdisk its not
special in any way at all.
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