36  * - Create two windows with a certain expiration period, and
37  *   offsetted by period / 2.
57  * @period: the expiration period in nanoseconds
60                               int64_t period)  in update_expiration()  argument
63     int64_t elapsed = (now - w->expiration) % period;  in update_expiration()
65     int64_t remaining = period - elapsed;  in update_expiration()
97  * @period:     the time window period in nanoseconds
100                         uint64_t period)  in timed_average_init()  argument
105      * the interval [ta->period/2,ta->period). By adjusting the  in timed_average_init()
106      * requested period by 4/3, we guarantee that they're in the  in timed_average_init()
107      * interval [2/3 period,4/3 period), closer to the requested  in timed_average_init()
108      * period on average */  in timed_average_init()
109     ta->period = (uint64_t) period * 4 / 3;  in timed_average_init()
116     /* Both windows are offsetted by half a period */  in timed_average_init()
117     ta->windows[0].expiration = now + ta->period / 2;  in timed_average_init()
118     ta->windows[1].expiration = now + ta->period;  in timed_average_init()
133     assert(ta->period != 0);  in check_expirations()
140             update_expiration(w, now, ta->period);  in check_expirations()
154         *elapsed = ta->period - remaining;  in check_expirations()