Re: [RFD] Automatic suspend

Woodruff, Richard
2009-02-18T00:18:59Z

> On Tue, 17 Feb 2009 09:32:46 -0600
> "Woodruff, Richard" <r-woodruff2@ti.com> wrote:
>
> > > so use range timers / timer slack for those apps that you do not
> > > trust. That is not a big deal, and solves the issue of timer
> > > wakeups...
> >
> > I not so sure it is that straight forward in practice. End systems
> > integrate a lot of 3rd party software who view performance 1st and
> > have no thought of power.
>
> you know that with the range timers/slack, you can control the
> "rounding" of the timer of the application, right?

I've not explored user space for this.

Can on a per-application basis some controlling application cause timers of a target process to be rounded or is it global? Or do you need to link the new application to use special glib variants (as described in OLS papers a few years ago)?

> You can *directly* throttle the number of wakeups an application causes
> that way to a value you set.

Are you talking about your work as seen in lwn.net summary?

http://lwn.net/Articles/296578/

Your change here does look like something which could be used to control timers. Don't you still need some dynamic way to set the fuzz/slack if its globally applied? It seems like you might want some timers precise and others fuzzy.

Would the holding of a wakelock or some activity counter be a good trigger for switching rounding time? If wakelocks held "minor adjustment" else "major adjustment"

Thanks for the good pointer assuming I understood it in quick scan.

Thanks,
Richard W.