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SubjectRe: [linux-pm] [PATCH] cpuidle: avoid singing capacitors
On Tue, 4 Mar 2008 18:29:18 +0100
Andi Kleen <andi@firstfloor.org> wrote:

> > So for now, I'm back to thinking that measuring the interval between deep sleeps is the better approach. I could use some ideas for a good clock source though. I haven't dug much deeper than jiffies when it comes to kernel timekeeping.
>
> jiffies should work, you just need to make sure you measure them at the
> right place. In particular there is some code in dyntick that catches
> up on jiffies after the deep sleep when the normal timer handler didn't run
> and jiffies are only usable again after that code executed.
>

And how can I tell if this handler has run? Not that it really matters I guess, as I don't think running it from the cpuidle governor is very sane.

--
-- Pierre Ossman

Linux kernel, MMC maintainer http://www.kernel.org
PulseAudio, core developer http://pulseaudio.org
rdesktop, core developer http://www.rdesktop.org


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