Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123native_smp_send_reschedule, round 2

From: Tejun Heo
Date: Mon May 20 2013 - 03:36:21 EST


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.


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