linux-kernel - Re: Linux 2.6.21 - something wrong with dmesg.

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Message-Id: <200704271639.13419.s0348365@sms.ed.ac.uk>
Date:	Fri, 27 Apr 2007 16:39:13 +0100
From:	Alistair John Strachan <s0348365@....ed.ac.uk>
To:	"Sunil Naidu" <akula2.shark@...il.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Frederik Deweerdt" <deweerdt@...e.fr>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: Linux 2.6.21 - something wrong with dmesg.

On Friday 27 April 2007 15:31:37 Sunil Naidu wrote:
> On 4/26/07, Alistair John Strachan <s0348365@....ed.ac.uk> wrote:
> > > Don't you need to increase CONFIG_LOG_BUF_SHIFT ?
>
> Yep, I need to. But, have to enable the Kernel Debug (DEBUG_KERNEL) to
> increase the value from default 14 value to 15/16. I feel that this
> might increase the kernel size?

>From a quick grep, DEBUG_KERNEL will only increase the kernel size on PARISC 
(arch/parisc/mm/init.c), so setting it won't have any adverse affect on your 
kernel size (if you disable all the options under it).

> Ummm, is it possible to move CONFIG_LOG_BUF_SHIFT under the General
> Setup area? (say, down the Kernel .config support - IKCONFIG).

I agree with this. It's also quite interesting to see that one can enable 
DEBUG_KERNEL, increase CONFIG_LOG_BUF_SHIFT, and then disable DEBUG_KERNEL, 
and the changed value is still used.

I think it should be easier to change this value, as anybody with it set too 
low has a useless kernel log buffer and it can make reporting more difficult.

-- 
Cheers,
Alistair.

Final year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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