average.h

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#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);

static inline unsigned long ewma_read(const struct ewma *avg)
{
    return avg->internal >> avg->factor;
}

#endif /* _LINUX_AVERAGE_H */