linux-kernel - Re: [RFC PATCH 11/12] workqueue: add WQ_CPU_INTENSIVE to system_long

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Message-ID: <20120926183833.GI12544@google.com>
Date:	Wed, 26 Sep 2012 11:38:33 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 11/12] workqueue: add WQ_CPU_INTENSIVE to
 system_long_wq

On Thu, Sep 27, 2012 at 01:20:42AM +0800, Lai Jiangshan wrote:
> works in system_long_wq will be running long.
> add WQ_CPU_INTENSIVE to system_long_wq to avoid these kinds of works occupy
> the running wokers which delay the normal works.
> 
> if system_long_wq is designed for only sleep-long works, not running-long works,
> this patch makes no sense.

There "long" doesn't mean it's gonna consume a lot of CPU cycles, so
it should contribute to concurrency management.  The plan is to remove
system_long_wq once we got rid of flushing of system_wq via
flush_scheduled_work() and directly through flush_workqueue().  I
think we're pretty close, so let's not add more usage of it.

Thanks.

-- 
tejun
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