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

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Message-Id: <20070424131427.940d461e.akpm@linux-foundation.org>
Date:	Tue, 24 Apr 2007 13:14:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jeremy Fitzhardinge <jeremy@...p.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

On Tue, 24 Apr 2007 13:00:49 -0700 Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Andrew Morton wrote:
> > Well, it _is_ mysterious.
> >
> > Did you try to locate the code which failed?  I got lost in macros and
> > include files, and gave up very very easily.  Stop hiding, Ingo.
> >   
> 
> OK, I've managed to reproduce it.  Removing the local_irq_save/restore
> from sched_clock() makes it go away, as I'd expect (otherwise it would
> really be magic).

erm, why do you expect that?  A local_irq_save()/local_irq_restore() pair
shouldn't be affecting anything?

>  But given that it never seems to touch the softlockup
> during testing, I have no idea what difference it makes...

To what softlockup are you referring, and what does that have to do with
anything?

<feels dumb>
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