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

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Message-Id: <20070424141418.887d1d98.akpm@linux-foundation.org>
Date:	Tue, 24 Apr 2007 14:14:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Daniel Walker <dwalker@...sta.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Prarit Bhargava <prarit@...hat.com>,
	Rick Lindsley <ricklind@...ibm.com>,
	john stultz <johnstul@...ibm.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	virtualization@...ts.osdl.org,
	Chris Lalancette <clalance@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 1/4] Ignore stolen time in the softlockup watchdog

On Tue, 24 Apr 2007 22:59:18 +0200 Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Daniel Walker <dwalker@...sta.com> wrote:
> 
> > On Tue, 2007-04-24 at 13:24 -0700, Jeremy Fitzhardinge wrote:
> > 
> > > And sched_clock's use of local_irq_save/restore appears to be absolutely
> > > correct, so I think it must be triggering a bug in either the self-tests
> > > or lockdep itself.
> > 
> > Why does sched_clock need to disable interrupts?
> 
> i concur. To me it appears not "absolutely correct" that someone 
> apparently added local_irq_save/restore to sched_clock(), but "absolute 
> madness". sched_clock() is _very_ performance-sensitive for the 
> scheduler, do not mess with it.

Why does a local_irq_save/restore make the selftests fail??
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