linux-kernel - Re: One of these things (CONFIG

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Message-ID: <20130122215257.GU22517@atomide.com>
Date:	Tue, 22 Jan 2013 13:52:57 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Arnd Bergmann <arnd@...db.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Matt Sealey <matt@...esi-usa.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ben Dooks <ben@...tec.co.uk>, Ingo Molnar <mingo@...hat.com>,
	Linux ARM Kernel ML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: One of these things (CONFIG_HZ) is not like the others..

* John Stultz <john.stultz@...aro.org> [130122 11:02]:
> 
> Correct, with HRT, we actually trigger the HZ-frequency timer tick
> from an hrtimer (which expires based on the system time driven by
> the clocksource). Thus even if there is a theoretical error between
> the ideal HZ and what the hardware can do, that error will not
> propagate forward.

If there's no cumulative error, sounds like the way to go is to select
HRT for ARM multiplatform builds and set the HZ to 100 then.

Regards,

Tony
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