linux-kernel - Re: [PATCH] x86_64: Limit the number of processor bootup messages

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Date:	Sat, 14 Nov 2009 01:53:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Travis <travis@....com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Dave Jones <davej@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland Dreier <rdreier@...co.com>,
	Randy Dunlap <rdunlap@...otime.net>, Tejun Heo <tj@...nel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Yinghai Lu <yinghai@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Jack Steiner <steiner@....com>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: Limit the number of processor bootup messages


* Mike Travis <travis@....com> wrote:

> H. Peter Anvin wrote:
> >On 11/12/2009 02:22 PM, Dave Jones wrote:
> >>But I don't disagree with Andi either, that it's not particularly useful,
> >>and we can get all this from userspace in /proc/cpuinfo, or x86info.
> >>
> >
> > I personally don't think it's useful at all.  It gives information 
> > about the processor which can be obtained from other sources.  What 
> > we want is enough information that the CPU can be unambiguously 
> > identified, so that when someone posts dmesg we can tell what 
> > machine they came from.
> 
> Can we say the same thing about the sched debug messages?  It's even 
> more painful because the number of lines output is exponential to the 
> number of cpus.

Yeah - but instead of getting rid of them please tie them to a (default 
off) debug switch. There's been the occasional crash where they were 
useful.

	Ingo
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