linux-kernel - Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send

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Date:	Mon, 20 May 2013 16:36:12 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123
 native_smp_send_reschedule, round 2

Hello,

On Mon, May 20, 2013 at 08:47:27AM +0200, Borislav Petkov wrote:
> > So there are two questions here:
> > 1. Is gov_queue_work() want to queue the work on offline cpu?
> > 2. Is mod_delayed_work_on() allow offline cpu?
> > 
> > I guess both should be false?
> 
> Well, if we don't allow queueing work on a cpu which goes offline, i.e.
> #2, the problem should be solved.
> 
> Tejun?

Workqueue proper would behave okish (no affinity of course but the
work items are still executed) but mod_delayed_work_on() adds a timer
on the target CPU and I think adding a timer on an offline cpu would
be a problem.

Thanks.

-- 
tejun
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