linux-kernel - Re: [patch 1/4] Ignore stolen time in the softlockup watchdog

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Date:	Tue, 24 Apr 2007 11:16:09 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	virtualization@...ts.osdl.org, Prarit Bhargava <prarit@...hat.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>,
	Zachary Amsden <zach@...are.com>,
	James Morris <jmorris@...ei.org>,
	Dan Hecht <dhecht@...are.com>,
	Paul Mackerras <paulus@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Chris Lalancette <clalance@...hat.com>,
	Rick Lindsley <ricklind@...ibm.com>, Andi Kleen <ak@...e.de>
Subject: Re: [patch 1/4] Ignore stolen time in the softlockup watchdog

Andrew Morton wrote:
> I said that because the damn thing went away when I was hunting it down
> because I lost the config and was unable to remember the right combination
> of debug settings.  Fortunately it later came back so I took care to
> preserve the config.
>   

sched_clock doesn't *do* anything except flap interrupts. Oh, wait, have
you got Andi's bugfixed version of the sched_clock patch?  The first
version did a local_save_flags rather than a local_irq_save.

>> Hm, is it caused by using sched_clock() to generate the printk
>> timestamps while generating the lock test output?
>>     
>
> Conceivably.  What does that locking API test do?
>   

Didn't make a difference here.  Building your config now.

> I was using printk timestamps and netconsole at the time.
>   

Ah, great, now you're going to make me setup netconsole...

    J

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