From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- include/linux/average.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 include/linux/average.h (limited to 'include/linux/average.h') diff --git a/include/linux/average.h b/include/linux/average.h new file mode 100644 index 000000000..c6028fd74 --- /dev/null +++ b/include/linux/average.h @@ -0,0 +1,30 @@ +#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 */ -- cgit v1.2.3-54-g00ecf