linux-kernel - Re: [PATCH 1/2] watchdog: introduce touch_softlockup_watchdog

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Message-ID: <20151203093350.GP17308@twins.programming.kicks-ass.net>
Date:	Thu, 3 Dec 2015 10:33:50 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Ulrich Obergfell <uobergfe@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 1/2] watchdog: introduce touch_softlockup_watchdog_sched()

On Wed, Dec 02, 2015 at 07:28:10PM -0500, Tejun Heo wrote:
> Hello,
> 
> There haven't been too many workqueue stall bugs; however, good part
> of them have been pretty painful to track down because there's no
> lockup detection mechanism for workqueue and it isn't easy to tell
> what's going on with workqueues; furthermore, some requirements are
> tricky to get right - e.g. it's not too difficult to miss
> WQ_MEM_RECLAIM for a workqueue which runs a work item which is flushed
> by something which sits in the reclaim path.

have you considered something as simple as:

	WARN_ON(current->reclaim_state && !WQ_MEM_RECLAIM);

?
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