Re: [PATCH] Track accurate idle time with tick_sched.idle_sleeptime

[Ingo Molnar]

* Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> > at least the current out-of-idle code already does what amounts to a 
> > PM-timer read when exiting from C2 or C3 mode. The
> 
> C2/C3 are already slow. I more worry about C1.

C2/C3 are only slow in older CPUs - and they are getting faster and 
faster. (also, newer systems do less of C1, due to increased energy 
awareness.)

would be nice to measure the overhead/impact i suspect.

	Ingo
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