1 #ifndef _LINUX_AVERAGE_H
2 #define _LINUX_AVERAGE_H
3 
4 /* Exponentially weighted moving average (EWMA) */
5 
6 /* For more documentation see lib/average.c */
7 
8 struct ewma {
9 	unsigned long internal;
10 	unsigned long factor;
11 	unsigned long weight;
12 };
13 
14 extern void ewma_init(struct ewma *avg, unsigned long factor,
15 		      unsigned long weight);
16 
17 extern struct ewma *ewma_add(struct ewma *avg, unsigned long val);
18 
19 /**
20  * ewma_read() - Get average value
21  * @avg: Average structure
22  *
23  * Returns the average value held in @avg.
24  */
ewma_read(const struct ewma * avg)25 static inline unsigned long ewma_read(const struct ewma *avg)
26 {
27 	return avg->internal >> avg->factor;
28 }
29 
30 #endif /* _LINUX_AVERAGE_H */
31