linux-kernel - Re: workqueue code needing preemption disabled

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Message-ID: <1363631744.25967.199.camel@gandalf.local.home>
Date:	Mon, 18 Mar 2013 14:35:44 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Clark Williams <clark@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: workqueue code needing preemption disabled

On Mon, 2013-03-18 at 11:26 -0700, Tejun Heo wrote:

> > Hmm, the issue is that a "use to be" idle thread got migrated, and is
> > now being woken up by another worker. What can cause an established
> > worker to migrate without HOTPLUG being active?
> 
> It doesn't.  I think it's trying to wakeup the idle_list head.
> 

That definitely makes sense. I'll go and write up a patch.

Thanks!!!

-- Steve


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