14  * Where x_{i,j} is j's number of events in i-th last time period and x_i is
15  * total number of events in i-th last time period.
43 	/* Use 1 to avoid dealing with periods with 0 events... */  in fprop_global_init()
44 	err = percpu_counter_init(&p->events, 1, gfp);  in fprop_global_init()
53 	percpu_counter_destroy(&p->events);  in fprop_global_destroy()
61  * if aging zeroed out all events. This can be used to detect whether declaring
66 	s64 events = percpu_counter_sum(&p->events);  in fprop_new_period()  local
69 	 * Don't do anything if there are no events.  in fprop_new_period()
71 	if (events <= 1)  in fprop_new_period()
76 		events -= events >> periods;  in fprop_new_period()
77 	/* Use addition to avoid losing events happening between sum and set */  in fprop_new_period()
78 	percpu_counter_add(&p->events, -events);  in fprop_new_period()
95 	err = percpu_counter_init(&pl->events, 0, gfp);  in fprop_local_init_percpu()
105 	percpu_counter_destroy(&pl->events);  in fprop_local_destroy_percpu()
125 		s64 val = percpu_counter_read(&pl->events);  in fprop_reflect_period_percpu()
128 			val = percpu_counter_sum(&pl->events);  in fprop_reflect_period_percpu()
130 		percpu_counter_add_batch(&pl->events,  in fprop_reflect_period_percpu()
133 		percpu_counter_set(&pl->events, 0);  in fprop_reflect_period_percpu()
143 	percpu_counter_add_batch(&pl->events, nr, PROP_BATCH);  in __fprop_add_percpu()
144 	percpu_counter_add(&p->events, nr);  in __fprop_add_percpu()
157 		num = percpu_counter_read_positive(&pl->events);  in fprop_fraction_percpu()
158 		den = percpu_counter_read_positive(&p->events);  in fprop_fraction_percpu()