Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors

[Pierre Ossman]

On Tue, 4 Mar 2008 18:29:18 +0100
Andi Kleen <andi@xxxxxxxxxxxxxx> 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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