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76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
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#ifndef _LINUX_AVERAGE_H
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#define _LINUX_AVERAGE_H
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/* Exponentially weighted moving average (EWMA) */
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/* For more documentation see lib/average.c */
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struct ewma {
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unsigned long internal;
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unsigned long factor;
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unsigned long weight;
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};
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/*
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* Exponentially weighted moving average (EWMA)
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*
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* This implements a fixed-precision EWMA algorithm, with both the
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* precision and fall-off coefficient determined at compile-time
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* and built into the generated helper funtions.
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*
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* The first argument to the macro is the name that will be used
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* for the struct and helper functions.
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*
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* The second argument, the precision, expresses how many bits are
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* used for the fractional part of the fixed-precision values.
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*
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* The third argument, the weight reciprocal, determines how the
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* new values will be weighed vs. the old state, new values will
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* get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
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* that this parameter must be a power of two for efficiency.
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*/
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#define DECLARE_EWMA(name, _precision, _weight_rcp) \
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struct ewma_##name { \
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unsigned long internal; \
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}; \
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static inline void ewma_##name##_init(struct ewma_##name *e) \
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{ \
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e->internal = 0; \
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} \
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static inline unsigned long \
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ewma_##name##_read(struct ewma_##name *e) \
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{ \
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return e->internal >> (_precision); \
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} \
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static inline void ewma_##name##_add(struct ewma_##name *e, \
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unsigned long val) \
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{ \
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unsigned long internal = READ_ONCE(e->internal); \
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unsigned long weight_rcp = ilog2(_weight_rcp); \
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unsigned long precision = _precision; \
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WRITE_ONCE(e->internal, internal ? \
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(((internal << weight_rcp) - internal) + \
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(val << precision)) >> weight_rcp : \
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(val << precision)); \
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}
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extern void ewma_init(struct ewma *avg, unsigned long factor,
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unsigned long weight);
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extern struct ewma *ewma_add(struct ewma *avg, unsigned long val);
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/**
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* ewma_read() - Get average value
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* @avg: Average structure
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*
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* Returns the average value held in @avg.
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*/
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static inline unsigned long ewma_read(const struct ewma *avg)
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{
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return avg->internal >> avg->factor;
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}
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#endif /* _LINUX_AVERAGE_H */
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