On Wed 2007-01-31 16:54:39, Alan Stern wrote:
> On Wed, 31 Jan 2007, Oliver Neukum wrote:
>
> > > timer whenever there is any activity, and when the timer expires you know
> > > the device has been idle long enough that you should suspend it. That's
> > > exactly how the autosuspend infrastructure works.
> >
> > This would call mod_timer() for every completed in-URB. Are you
> > sure this is better than an approach maintaining a periodical timer
> > and check for IO in the meantime?
>
> I am not sure it's better. The decision had to be made when I was
> designing the autosuspend stuff, and I decided to go this way. Maybe it
> was a wrong decision... it's hard to tell. It does have the advantage of
> avoiding extra timer events while the device is in use, but as you pointed
> out, it has the disadvantage of lots of timer rescheduling.
Both solutions are probably okay. mod_timer should be cheap.
Pavel
--
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