linux-kernel - Re: workqueue and kworker

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Message-ID: <20120719170734.GQ24336@google.com>
Date:	Thu, 19 Jul 2012 10:07:34 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Round Robinjp <roundrobinjp@...oo.co.jp>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: workqueue and kworker

Hello,

On Fri, Jul 20, 2012 at 01:01:34AM +0900, Round Robinjp wrote:
> It seems that even if you create a dedicated workqueue
> in your driver, it does not give you a dedicated
> kworker thread. Is this normal behaviour?

Yes.

> If so, then what is the difference between using
> generic workqueue and dedicated workqueue?

Please read Documentation/workqueue.txt.

> I need to set the priority of my kworker thread high
> (a specific value). For that I called sched_setscheduler()
> in my workqueue handler. But I found that other
> workqueues are also being executed on my high priority
> kworker thread which is unexpected.
> How do I give high priority to my kworker thread
> without affecting the behaviour of other workqueues?

If you want a dedicated worker thread, please use kthread_worker in
include/linux/kthread.h.  Or all you want is just higher nice value,
3.6 is reimplemnting WQ_HIGHPRI so that highpri tasks are executed w/
-20 nice value.

Thanks.

-- 
tejun
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