Re: workqueue code needing preemption disabled
From: Steven Rostedt
Date: Mon Mar 18 2013 - 13:08:21 EST
On Mon, 2013-03-18 at 09:43 -0700, Tejun Heo wrote:
> Making gcwq locks disable preemption would be much safer / easier, but
> if that's not desirable, anything touching gcwq->idle_list would be a
> good place to start - worker_enter_idle() and worker_leave_idle().
> Hmmm... ignoring CPU hotplug, I think those two might just do it.
> Give it a try? How reproducible is the problem?
Not very :-( I triggered it twice on a 40 CPU box. It can go
approximately 1 month before it triggers. And the box we are testing on
is currently a loaner, and we have it on extension right now. Which
means we wont have it much longer.
But perhaps that's the place to fix things.
Thanks,
-- Steve
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