linux-kernel - Re: [PATCH 0/5] [GIT PULL] updates for tip/tracing/ftrace

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Date:	Sat, 21 Mar 2009 11:01:29 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 0/5] [GIT PULL] updates for tip/tracing/ftrace


* Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> On Fri, 20 Mar 2009, Frederic Weisbecker wrote:
> > > >  
> > > >  	VERBOSE_PRINTK_STRING("rcu_torture_reader task started");
> > > > -	set_user_nice(current, 19);
> > > > +	set_user_nice(current, -1);
> > > >  	if (irqreader && cur_ops->irqcapable)
> > > >  		setup_timer_on_stack(&t, rcu_torture_timer, 0);
> > > 
> > > i dont have a reproducer right now. Can you trigger it with latest 
> > > -tip, which has this commit included:
> > > 
> > > 04cb9ac: rcu: rcu_barrier VS cpu_hotplug: Ensure callbacks in dead cpu are migrated to o
> > > 
> > > ?
> > > 
> > > 	Ingo
> > 
> > 
> > I tested three times the same things but with 04cb9ac and... it didn't triggered
> > anymore :-)
> 
> So lets hope that was the culprit.
> 
> Great work Frederic!

No new lockups of this nature in overnight -tip testing. It's still 
a bit too early to tell for sure but it's promising ;-)

	Ingo
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