linux-kernel - Re: [PATCH v2] virtio_balloon: Convert "vballon" kthread into a workqueue

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Message-ID: <20141114131915.GD21209@htj.dyndns.org>
Date:	Fri, 14 Nov 2014 08:19:15 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Petr Mladek <pmladek@...e.cz>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jiri Kosina <jkosina@...e.cz>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] virtio_balloon: Convert "vballon" kthread into a
 workqueue

Hello, Michael, Petr.

On Wed, Nov 12, 2014 at 03:32:04PM +0200, Michael S. Tsirkin wrote:
> > +	/* The workqueue servicing the balloon. */
> > +	struct workqueue_struct *wq;
> > +	struct work_struct wq_work;
> 
> We could use system_freezable_wq instead.
> I do agree a dedicated wq is better since this can get blocked
> for a long time while allocating memory.
> However, please add a comment to this effect.

system_freezable_wq should be fine.  Workqueues by default have a
pretty high maximum concurrency level (256).  There's no reason to
create separate workqueues solely for that purpose.

Thanks.

-- 
tejun
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