linux-kernel - Re: [PATCH try #3] Input/Joystick Driver: add support AD7142 joystick driver

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Message-ID: <d120d5000710160953w43e946f8ofd5bdbe152ea038e@mail.gmail.com>
Date:	Tue, 16 Oct 2007 12:53:22 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Bryan Wu" <cooloney.lkml@...il.com>
Cc:	bryan.wu@...log.com, "Andrey Panin" <pazke@...pac.ru>,
	"Roel Kluin" <12o3l@...cali.nl>,
	"Ahmed S. Darwish" <darwish.07@...il.com>,
	linux-input@...ey.karlin.mff.cuni.cz,
	linux-joystick@...ey.karlin.mff.cuni.cz,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	"Jean Delvare" <khali@...ux-fr.org>
Subject: Re: [PATCH try #3] Input/Joystick Driver: add support AD7142 joystick driver

On 10/16/07, Bryan Wu <cooloney.lkml@...il.com> wrote:
> On 10/16/07, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> > On 10/15/07, Bryan Wu <cooloney.lkml@...il.com> wrote:
> > > On 10/15/07, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> > > >
> > > > Completion is just not a good abstraction here... Please use work
> > > > abstraction and possibly a separate workqueue.
> > >
> > > Yes, I agree with you now, although I have a little concern about the
> > > possibility of big delay introduced by workqueue.
> > >
> >
> > Having a separate workqueue should isolate the driver from users
> > hogging keventd. Otherwise the speed should be pretty much the same as
> > with a kthread.
> >
>
> Does this driver need the create a new kthread instead of keventd?
> I think keventd might be sufficient for this driver.
>

No it does not have to start a new workqueue. I'd start with keventd
and only implement a separate workqueue later if I saw the driver
being starved by other keventd users.

-- 
Dmitry
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