linux-kernel - Re: [RFC] HZ free ntp

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Date:	Mon, 1 Jan 2007 17:27:45 +0100
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	john stultz <johnstul@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC] HZ free ntp

Hi,

On Wednesday 20 December 2006 02:32, john stultz wrote:

> > I know and all you have to change in the ntp and some related code is to
> > replace HZ there with a variable, thus make it changable, so you can
> > increase the update interval (i.e. it becomes 1s/hz instead of 1s/HZ).
>
> Untested patch below. Does this vibe better with you are suggesting?

Yes, thanks.
tick_nsec doesn't require special treatment, in the middle term it's obsolete 
anyway, it could be replaced with (current_tick_length() >> 
TICK_LENGTH_SHIFT) and current_tick_length() being inlined.
NTP_INTERVAL_FREQ could be a real variable (so it can be initialized at 
runtime), it's already gone from all important paths.
In the short term I'd prefered a clock would store its frequency instead of 
using NTP_INTERVAL_LENGTH in clocksource_calculate_interval(), so it doesn't 
has to be derived there.

bye, Roman
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