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SubjectRe: [PATCH] Remove timer frequency choice if tickless is enabled
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On Mon, 2008-01-14 at 09:25 +0100, Ingo Molnar wrote:
> (lkml Cc:-ed)
>
> * Carlos R. Mafra <crmafra2@gmail.com> 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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