linux-kernel - Re: [PATCH v6 2/2] Output stall data in debugfs

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Message-ID: <20110811210525.GR5782@one.firstfloor.org>
Date:	Thu, 11 Aug 2011 23:05:25 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Alex Neronskiy <zakmagnus@...omium.org>,
	linux-kernel@...r.kernel.org, peterz@...radead.org,
	Ingo Molnar <mingo@...e.hu>,
	Mandeep Singh Baines <msb@...omium.org>,
	Alex Neronskiy <zakmagnus@...omium.com>
Subject: Re: [PATCH v6 2/2] Output stall data in debugfs

> No because the serial console driver does a touch_nmi_watchdog().  So if
> we are trying to output debug info _before_ the lockup detector goes off,
> we effectively shoot ourselves in the foot by reseting the lockup detector
> everytime we print something.  Hence we are trying to capture the data and
> output using another interface.

Well surely that's fixable in the serial driver? Maybe set some global
on that CPU to disable it.

-Andi
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