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

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Message-ID: <20151203150604.GC27463@mtj.duckdns.org>
Date:	Thu, 3 Dec 2015 10:06:04 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.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 Thu, Dec 03, 2015 at 04:04:42PM +0100, Peter Zijlstra wrote:
> On Thu, Dec 03, 2015 at 09:48:11AM -0500, Tejun Heo wrote:
> > We can add MEM_RECLAIM -> !MEM_RECLAIM warning mechanism in addition
> > but I think adding stall detection is justified.
> 
> Sure, a stall mech is always nice, but I was thinking we should be able
> to better catch some of these with explicit stuff.

Yeah, sure, I don't think we even need to meddle with lockdep.  I'm
gonna add WARN_ON_ONCE()s which trigger whenever something on reclaim
path tries to flush !WQ_MEM_RECLAIM workqueues or work items.

Thanks.

-- 
tejun
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