| #ifndef _LINUX_AVERAGE_H |
| #define _LINUX_AVERAGE_H |
| |
| /* Exponentially weighted moving average (EWMA) */ |
| |
| /* For more documentation see lib/average.c */ |
| |
| struct ewma { |
| unsigned long internal; |
| unsigned long factor; |
| unsigned long weight; |
| }; |
| |
| extern void ewma_init(struct ewma *avg, unsigned long factor, |
| unsigned long weight); |
| |
| extern struct ewma *ewma_add(struct ewma *avg, unsigned long val); |
| |
| /** |
| * ewma_read() - Get average value |
| * @avg: Average structure |
| * |
| * Returns the average value held in @avg. |
| */ |
| static inline unsigned long ewma_read(const struct ewma *avg) |
| { |
| return avg->internal >> avg->factor; |
| } |
| |
| #endif /* _LINUX_AVERAGE_H */ |