Li, Aubrey wrote:
>
> Sorry, I didn't catch your point. We have only one probe, from which we
> only have a timestamp.
> Next time the probe fired, the key of the association is changed.
> How to track an interval between the first time and the second time of
> the association with the same key?
>
I guess you need to track the old state and time for the CPU. I think
you can do that in some
associative arrays:
::cpu_change_speed
{
...
this->cpu = (processorid_t)arg1; /* arg1 == CPU for which we
are changing speed */
this->newspd = (uint_t)arg2; /* arg2 == New speed */
this->oldspd = current_speeds[this->cpu];
current_speeds[this->cpu] = this->newspd;
this->now = timestamp;
time_at_speed = this->now - state_times[this->cpu];
state_times[this->cpu] = this->now;
@pstate_times[this->oldspd, this->cpu] = sum(time_at_speed);
}
... or to get aggregate times (across all CPUs) I think you should be
able to do:
@pstate_times[this->oldspd] = sum(time_at_speed);
Thanks,
-Eric
