Li, Aubrey wrote:
> My system is in idle when this report was obtained.
>
> I'll investigate it and let you know what's going on.
>
hmm..., the problem is when pt_cpuidle_stat_collect()
calculate C0 residency, it always counts all cpus up.
pt_cpuidle_stat_collect(double interval)
{
----snip----
/*
* Assume that all the time spent in this interval will
* be the default "0" state. The DTrace walker will reallocate
* time out of the default bucket as it processes aggregation
* records for time spent in other states.
*/
g_cstate_info[0].total_time = (long)(interval * g_ncpus * 1000);
----snip----
}
When we use -c option, C0 should be calculated only on the specific
CPU. So, here, g_ncpus is not fit for the -c option.
Does this make sense? Do you always test powertop on one logical
core system?
Thanks,
-Aubrey
