linux-kernel - Re: [PATCH] thermal: Use freezable workqueue

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Date:	Tue, 8 Feb 2011 10:32:12 +0100
From:	Tejun Heo <tj@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Len Brown <len.brown@...el.com>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] thermal: Use freezable workqueue

Hello, Dmitry, Rafael.

On Tue, Feb 08, 2011 at 10:20:25AM +0100, Rafael J. Wysocki wrote:
> > > +	thermal_wq = alloc_workqueue("thermal", WQ_FREEZEABLE, 0);
> > 
> > Should probably be unbound as well.
> 
> Yup, thanks.

Hmm.. why should it be unbound?  Unbound wqs are primarily useful for
very long running (system daemon type) works which may also consume
considerable amount of cpu cycles.

> > FWIW, I would not mind if we had a global freezeable workqueue already
> > predefined. I could switch input_polldev and vmw_balloon to it and there
> > probably could be more users...
> 
> Hmm, OK.
> 
> Do you think we should add system_freezeable_wq to the set of predefined
> workqueues?

Oh, yeah, definitely.  I'll write up a patch.

Thanks.

-- 
tejun
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