/* One trial to obtain the MHZ of the CPU. MHZ is guessed by comparing
the cycle counter value and the gettimeofday value. To filter out
random fluctuations, this proc is called ITR times and the median
is taken. */
static double
get_mhz_itr ()
{
struct timeval start, end;
long elapsed;
cycle_t x, y;
gettimeofday(&start, 0);
read_cycle_counter(&x);
for (;;) {
gettimeofday(&end, 0);
read_cycle_counter(&y);
if (tv_diff(&start, &end) > 100000)
break;
}
return (double)diff_cycle_counter(x, y) / tv_diff(&start, &end);
}
void
spy_start (spy_t s)
{
if (s->active) {
printf("spy: %s already active.\n", s->name);
}
s->active = 1;
read_cycle_counter(&s->start);
}
/*
* Start timing now.
*/
void
start()
{
#ifdef CYCLE_COUNTER
read_cycle_counter(&start_clk);
#else
(void) gettimeofday(&start_tv, (struct timezone *) 0);
#endif
#ifdef EVENT_COUNTERS
/*
* We start the event counters *after* the cycle counter under the
* assumption that the user is more interested in precise event
* timing, otherwise why would they be using the counters at all?
*/
start_eventcounters();
#endif
}
void
spy_stop (spy_t s)
{
cycle_t stop;
unsigned d;
read_cycle_counter(&stop);
d = diff_cycle_counter(s->start, stop);
if (!s->active) {
printf("spy: %s not active.\n", s->name);
}
s->active = 0;
s->cumulative += d;
if (s->max < d) s->max = d;
if (s->min > d) s->min = d;
if (s->n < s->n_samples) {
s->samples[s->n] = d;
}
s->n++;
}
