linux-kernel - Re: [PATCH v2] core: workqueue: return on workqueue recursion

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Date:	Fri, 12 Feb 2010 17:47:24 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Simon Kagstrom <simon.kagstrom@...insight.net>
CC:	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	laijs@...fujitsu.com, rusty@...tcorp.com.au,
	akpm@...ux-foundation.org, mingo@...e.hu
Subject: Re: [PATCH v2] core: workqueue: return on workqueue recursion

On 02/04/2010 05:02 PM, Simon Kagstrom wrote:
> When the workqueue is flushed from workqueue context (recursively), the
> system enters a strange state where things at random (dependent on the
> global workqueue) start misbehaving. For example, for us the console and
> logins locks up while the web server continues running.
> 
> The system becomes unstable since the workqueue barrier locks the
> workqueue. This patch instead returns if the workqueue is flushed
> recursively, which keeps the workqueue alive but warns.
> 
> Signed-off-by: Simon Kagstrom <simon.kagstrom@...insight.net>

applied to wq tree.  Will push out when the merge window opens.

Thanks.

-- 
tejun
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