CPUFreq addon in HAL

[Kevin Ottens]

Le mercredi 5 juillet 2006 18:13, Holger Macht a écrit :
> > Original, but why not after. It's original to have a fine grained control
> > like this.
>
> I really don't understand what you are trying to say here ;-) Was it a
> question or a statement? :-)

Yeah, missed a few words. It was more a statement. My point was more:
I don't really see a use for such a fine grained control right now, but I'm 
not necessarily against such a feature.

Btw, if you could provide a few use cases for this one you would make me 
happy. ;-)

> With the ondemand governor this setting is set through
> /sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice_load . The
> userspace implementation evaluates also the CPU nice load when calculation
> the CPU load.
>
> It specifies whether niced processes can cause a CPU frequency increment
> although they don't really need that much CPU power and thus wouldn't jump
> over the UP_THRESHOLD where frequencies are usually increased.
>
> It's a policy decision. On AC power for example, you also want to conisder
> niced processes because if the CPU frequency is switched up more
> frequently isn't that problematic. In the other case, On battery, you want
> a more passive frequency policy and thus you don't consider niced
> processes.

Ok, thanks for the insight.

> > I think one method is missing, I would expect a method to list the
> > available CPU governors.
>
> Yes, this could be added or this information could be exported on a
> device.

Great!

Regards.
-- 
Kévin 'ervin' Ottens, http://ervin.ipsquad.net
"Ni le maître sans disciple, Ni le disciple sans maître,
Ne font reculer l'ignorance."
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