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

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Message-ID: <20080114082543.GC18296@elte.hu>
Date:	Mon, 14 Jan 2008 09:25:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Carlos R. Mafra" <crmafra2@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] Remove timer frequency choice if tickless is enabled


(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.

	Ingo
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