linux-kernel - Re: [patch] x86: reduce srat verbosity in the kernel log

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Message-ID: <alpine.DEB.2.00.0910281440580.32315@chino.kir.corp.google.com>
Date:	Wed, 28 Oct 2009 14:46:44 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Mike Travis <travis@....com>
cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Yinghai Lu <yinghai@...nel.org>, Mel Gorman <mel@....ul.ie>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [patch] x86: reduce srat verbosity in the kernel log

On Wed, 28 Oct 2009, Mike Travis wrote:

> > Printing a list of apic ids longer than 128 characters would pollute the
> > kernel log and this upper bound will probably never be reached based on the
> > way apic ids are created for physical and logical processors: they are
> > normally reduced to ranges instead of comma seperated entities.
> 
> Ahh, ok, thanks.
> 
> Does that mean this 10,649 character line full of periods is illegal?
> 

I'm not saying it would be illegal, merely that it would be harm 
readability.  Based on how apic id's are formed from processor ids, 
though, I think we're really talking about an upper limit (128) that will 
never be reached.

> [  102.551570] Completing Region/Field/Buffer/Package initialization:
> ............... [long time later] .........
> <4>Clocksource tsc unstable (delta = 4396383657849 ns)
> 
> I'm having trouble finding it.  Does it look familiar to anyone?
> 

It's debugging output from acpi_ns_initialize_objects() and each period is 
from acpi_ns_init_one_device().  You can suppress it by disabing 
CONFIG_ACPI_DEBUG.
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