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

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Message-ID: <4BDD4CD7.2060205@gmail.com>
Date:	Sun, 02 May 2010 11:58:47 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Samo Pogacnik <samo_pogacnik@....net>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-embedded <linux-embedded@...r.kernel.org>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] console logging detour via printk

01/05/2010 20:48, Samo Pogacnik wrote:
> Dne 01.05.2010 (sob) ob 12:04 +0100 je Alan Cox zapisal(a):
>>> while i was searching for effective logging of complete console output
>>> produced by the kernel and user phase of the boot process, it turned out
>>> that only kernel messages imho get systematically cached and stored into
>>> log files (if needed). All userspace processes are on their own to use
>>> syslog, which is fine, but there are also many console messages
>>> reporting the boot status via init scripts, .... I came across the
>>> bootlogd daemo, which handles the job of redirecting console output into
>>> a log file, but i find it problematic to use especialy, when using
>>> initial ram disk image.
>>
>> So you want to patch the kernel because you can't work out how to do this
>> in userspace ? The distributions seem to have no problem doing this in
>> user space that I can see. It doesn't seem to be a hard user space
>> problem, and there are a ton of things you want to do with this sort of
>> stuff (like network logging) that you can't do in kernel space.
> 
> 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). 

Mmm...It's an interesting problem. I see in my distro (openSuse) a
script called boot.klog that it seems to perform that (even initrd
part). In the file boot.msg I can see the initial prints of the kernel
and user space scripts.

Marco
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