linux-kernel - Re: [PATCH 0/6] loglevel=pci:8,acpi:8,apic=8 support v6

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Message-ID: <48D159A7.5080907@zytor.com>
Date:	Wed, 17 Sep 2008 12:25:27 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jason Baron <jbaron@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] loglevel=pci:8,acpi:8,apic=8 support v6

Jason Baron wrote:
> 
> hi,
> 
> indeed both proposals seem to be addressing a similar core issue - being
> able to dynamically (as opposed to re-compiling) change the amount of
> verbosity that the kernel spews. I would liken it to adding a -verbose
> flag to the kernel.
> 
> Beyond that the 2 approaches differ in a number of ways as I see:
> 

8) The ability to accessed filtered messages a posteori (via dmesg), 
which is something we currently take for granted.

This *is* the fundamental difference between what Yinghai has now and 
both your stuff and Yinghai's original proposal.  Not producing the 
additional messages at all is inherently cheaper, sometimes *much* 
cheaper, but it obviously means the information is not accessible at all.

At the moment, I would argue that the fact that dmesg is, in effect, 
more verbose than the kernel itself is a good thing; it makes dmesg 
dumps more useful.

	-hpa
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