linux-kernel - Re: [Bisected] qemu hangs on current git

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Message-ID: <20140122115421.GK31570@twins.programming.kicks-ass.net>
Date:	Wed, 22 Jan 2014 12:54:21 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	linux-kernel@...r.kernel.org, Dipankar Sarma <dipankar@...ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [Bisected] qemu hangs on current git

On Wed, Jan 22, 2014 at 12:44:43PM +0100, Markus Trippelsdorf wrote:
> On 2014.01.22 at 11:24 +0100, Peter Zijlstra wrote:
> > On Wed, Jan 22, 2014 at 10:37:55AM +0100, Markus Trippelsdorf wrote:
> > > git bisect points to:
> > > 
> > > commit 8cb75e0c4ec9786b81439761eac1d18d4a931af3
> > > Author: Peter Zijlstra <peterz@...radead.org>
> > > Date:   Wed Nov 20 12:22:37 2013 +0100
> > > 
> > >     sched/preempt: Fix up missed PREEMPT_NEED_RESCHED folding
> > > 
> > 
> > No idea why kvm would go funny on that, real hardware runs fine.
> > 
> > You're running a !PREEMPT kernel, right? Does the below make any
> > difference?
> 
> Yes: CONFIG_PREEMPT_VOLUNTARY=y 
> And yes, your patch fixes the issue.

Ah, indeed, VOLUNTARY needs this for should_resched; daft of me.

Thanks for testing!
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