linux-kernel - workqueue_set_max

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Message-ID: <1323424482.3622.8.camel@jlt3.sipsolutions.net>
Date:	Fri, 09 Dec 2011 10:54:42 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Tejun Heo <tj@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: workqueue_set_max_active(wq, 0)?

Hi,

I know workqueue_set_max_active(wq, 0) isn't allowed, but I was just
playing with making mac80211 completely synchronous in the configuration
path. (The reason is that right now, we have a single-threaded workqueue
and configuration entry points, so it's *almost* single-threaded /
synchronous. This means that the non-synchronous nature rarely gets
tested.)

So I thought I could put a work struct onto the workqueue and then when
it executes it signals the configuration function & waits for that to
finish, etc., a bit like the rendezvous mechanism used to flush works.

But then I thought maybe this should be more generic, like
"workqueue_pause()" / "workqueue_resume()".

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) :-)

johannes

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