linux-kernel - Re: Early kernel messages are overflowing the static log buffer

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Message-ID: <20101222212112.GC3139@elte.hu>
Date:	Wed, 22 Dec 2010 22:21:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Travis <travis@....com>
Cc:	Tejun Heo <tj@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Len Brown <lenb@...nel.org>, Jack Steiner <steiner@....com>,
	Lori Gilbertson <loriann@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Early kernel messages are overflowing the static log buffer


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

> Thanks.
> 
> I have a patchset almost ready for submission.  We have a giant
> system (6 racks with some huge amount of nodes) for a few more
> days, and the buffer still overflowed with my changes.  So I'm
> making one more tweak to cut down the amount of characters generated
> without losing information.

Also feel free to make judgement calls to cut information - people _think_ they need 
all that boot time noise but it's rarely useful. Memory layout is - but a lot of 
other details are not. So dont try to preserve things at any cost.

> This doesn't really help the log buffer overflow problem as KERN_DEBUG
> messages still end up in the buffer.  The pr_debug() macro does compile
> out the messages if the system does not have KERNEL debug set, though
> distros also have this set as a default.

Make the whole printout dependent on a percpu-debug boot parameter? (and default the 
switch to off?)

Thanks,

	Ingo
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