linux-kernel - Re: [PATCH] memstick: add support for legacy memorysticks

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Date:	Mon, 24 Sep 2012 11:05:16 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Dubov <oakad@...oo.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memstick: add support for legacy memorysticks

Hello,

On Mon, Sep 24, 2012 at 05:09:23PM +0200, Maxim Levitsky wrote:
> > Now that my exams done....
> > Can you spare me from using a workqueue?

I'd much prefer if you convert to workqueue.

> > The point is that using current model I wake the worker thread as much
> > as I want to, and I know that it will be woken once an will do all the
> > work till request queue is empty.

You can do exactly the same thing by scheduling the same work item
multiple times.  "Waking up" just becomes "scheduling the work item".

> > With workqueues, it doesn't work this way. I have to pass the request as
> > a work item or something like that.
> > Any pointers?

No, there's no reason to change the structure of the code in any way.
Just use a work item as you would use a kthread.

> Also probably due to that reason MMC doesn't use a workqueue ether, but
> a raw kthread, in pretty much same way I do.

Mostly because I haven't gotten around to convert it yet.  The
problems with direct kthread usage are that they're much more
difficult to get completely correct with freeze and exit conditions -
the last time I checked it was easier to spot broken ones than correct
ones - and they create dedicated threads which usually are
underutilized.

Thanks.

-- 
tejun
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