Re: [PATCH] Remove timer frequency choice if tickless is enabled

[Peter Zijlstra]

On Mon, 2008-01-14 at 09:25 +0100, Ingo Molnar wrote:
> (lkml Cc:-ed)
> 
> * Carlos R. Mafra <crmafra2@xxxxxxxxx> wrote:
> 
> >  choice
> >  	prompt "Timer frequency"
> > +	depends on !NO_HZ
> >  	default HZ_250
> >  	help
> >  	 Allows the configuration of the timer frequency. It is customary
> 
> we are not there yet to be able to do this. With NO_HZ the tick is only 
> disabled when we go idle - but it still runs (and we rely on it, for 
> example in the scheduler code) while we are non-idle. Peter Zijlstra is 
> working on the 'high-res scheduler tick' feature to remove the scheduler 
> dependencies.

Yes, and even then we're still not there, there are various other
features that are tick driven, among them the RCU quiecent state
machine.

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