linux-kernel - Re: workqueue_set_max

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Message-ID: <20111209165702.GD12108@google.com>
Date:	Fri, 9 Dec 2011 08:57:02 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: workqueue_set_max_active(wq, 0)?

Hello, Johannes. :)

On Fri, Dec 09, 2011 at 10:54:42AM +0100, Johannes Berg wrote:
> And then I found workqueue_set_max_active() but passing 0 isn't allowed.
> 
> Before I dive in more deeply I figured I'd ask if you think what a good
> way of doing this would be (and whether I'm completely insane) :-)

Hmmm... yeah, actually, that's what wq uses internally to implement
freezable workqueues.  It sets max_active to 0 temporarily and waits
for all in-flight works to finish.  On thaw, the original value is
restored.

Updating workqueue_set_max_active() to return the old value would be a
nice API update which goes together, I think.

Thanks.

-- 
tejun
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