linux-kernel - Re: workqueue: WARN at at kernel/workqueue.c:2176

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Date:	Wed, 4 Jun 2014 08:48:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	jjherne@...ux.vnet.ibm.com, Sasha Levin <sasha.levin@...cle.com>,
	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: workqueue: WARN at at kernel/workqueue.c:2176

On Wed, Jun 04, 2014 at 10:28:50AM +0800, Lai Jiangshan wrote:
> On 06/03/2014 07:24 PM, Lai Jiangshan wrote:
> > Hi, Jason
> > 
> > Could you test again after the following command has done.
> > (if Peter hasn't asked you test with this command before nor he doesn't stop you now) 
> > 
> > echo NO_TTWU_QUEUE > /sys/kernel/debug/sched_features
> 
> 
> Off-topic!
> 
> Why sched_features is in debugfs? I thought it is in procfs or sysfs.

because its for debugging, note that the entire thing relies on
CONFIG_SCHED_DEBUG, if you build without that its gone.

Its not an API its not for production use, its debugging.

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