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

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Message-ID: <20091120183708.GA1434@ucw.cz>
Date:	Fri, 20 Nov 2009 19:37:08 +0100
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	David Rientjes <rientjes@...gle.com>,
	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Travis <travis@....com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Roland Dreier <rdreier@...co.com>,
	Randy Dunlap <rdunlap@...otime.net>, Tejun Heo <tj@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Yinghai Lu <yhlu.kernel@...il.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@...r.kernel.org
Subject: Re: [patch] x86: reduce srat verbosity in the kernel log

Hi!

> There's two problems outlined in this discussion:
> 
>  A) too verbose bootup that is annoying with 64 CPUs and a show-stopper
>     with 4096 CPUs.
> 
>  B) the ad-hoc nature of our topology enumeration. Some of it is in
>     /sys, some of it is in printk logs. None really works well and 
>     there's no structure in it.
> 
> The simplest solution for (A) is what i suggested a few mails ago: dont 
> print the information by default, but allow (for trouble-shooting) 
> purposes for it to be printed when a boot option is passed.

Well, yes, it is *simplest*, but is it best? Example printing 'cpus
0-31 stepping 3, cpus 32-63 stepping 4' seem rather convincing --such
info should be there by default and not after speciial option...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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