linux-kernel - Re: [Bug #12650] Strange load average and ksoftirqd behavior with 2.6.29-rc2-git1

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Message-ID: <20090217151156.GC6761@linux.vnet.ibm.com>
Date:	Tue, 17 Feb 2009 07:11:56 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Damien Wyart <damien.wyart@...e.fr>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #12650] Strange load average and ksoftirqd behavior with
	2.6.29-rc2-git1

On Tue, Feb 17, 2009 at 07:11:42AM +0100, Damien Wyart wrote:
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> [2009-02-16 14:39]:
> > What is the easiest way for me to make it easy to trace the return path
> > from __rcu_pending()?  Make each return path call an empty function
> > located off where the compiler cannot see it, I guess...  Diagnostic
> > patch along these lines below.  Frederic, Damien, could you please give
> > it a go?  (And of course please let me know if something else is
> > needed.)
> 
> As Frederic already sent a trace (made with another method), I'll
> consider for now mine would not be very useful at this stage, so I'm
> waiting for further instructions.
> 
> If you need further testing for me, do not hesitate to ask...

I would be very interested to hear whether or not my patch removing
rcu_pending() and rcu_check_callbacks() from the x86_32 idle loop
fixes the problem for you.

						Thanx, Paul
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