f64 dtr_max;
u64 dtc = c->last_cpu_time - c->last_verify_cpu_time;
f64 new_clocks_per_second, delta;
- f64 round_units = 100e5;
c->last_verify_cpu_time = c->last_cpu_time;
c->last_verify_reference_time = now_reference;
return;
}
+ if (PREDICT_FALSE (c->round_to_units == 0.0))
+ {
+ f64 next_pow10, est_round_to_units;
+ /*
+ * Compute the first power of ten which is greater than
+ * 0.1% of the new clock rate. Save the result, and use it
+ * to round future results, so we don't end up calculating
+ * silly-looking clock rates.
+ */
+ est_round_to_units = ((f64) dtc / dtr) * 0.001;
+ next_pow10 = ceil (log10 (est_round_to_units));
+ c->round_to_units = pow (10.0, next_pow10);
+ }
+
/*
* Reject large frequency changes, another consequence of
* system clock changes particularly with old kernels.
*/
new_clocks_per_second =
- flt_round_nearest ((f64) dtc / (dtr * round_units)) * round_units;
+ flt_round_nearest ((f64) dtc / (dtr * c->round_to_units))
+ * c->round_to_units;
delta = new_clocks_per_second - c->clocks_per_second;
if (delta < 0.0)
}
c->clocks_per_second =
- flt_round_nearest ((f64) dtc / (dtr * round_units)) * round_units;
+ flt_round_nearest ((f64) dtc / (dtr * c->round_to_units))
+ * c->round_to_units;
c->seconds_per_clock = 1 / c->clocks_per_second;
/* Double time between verifies; max at 64 secs ~ 1 minute. */