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

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Message-Id: <1200299295.7415.0.camel@twins>
Date:	Mon, 14 Jan 2008 09:28:15 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Carlos R. Mafra" <crmafra2@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Remove timer frequency choice if tickless is enabled


On Mon, 2008-01-14 at 09:25 +0100, Ingo Molnar wrote:
> (lkml Cc:-ed)
> 
> * Carlos R. Mafra <crmafra2@...il.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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