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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);
/**
* 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;
}
#define DECLARE_EWMA(name, _factor, _weight) \
struct ewma_##name { \
unsigned long internal; \
}; \
static inline void ewma_##name##_init(struct ewma_##name *e) \
{ \
BUILD_BUG_ON(!__builtin_constant_p(_factor)); \
BUILD_BUG_ON(!__builtin_constant_p(_weight)); \
BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \
BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \
e->internal = 0; \
} \
static inline unsigned long \
ewma_##name##_read(struct ewma_##name *e) \
{ \
BUILD_BUG_ON(!__builtin_constant_p(_factor)); \
BUILD_BUG_ON(!__builtin_constant_p(_weight)); \
BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \
BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \
return e->internal >> ilog2(_factor); \
} \
static inline void ewma_##name##_add(struct ewma_##name *e, \
unsigned long val) \
{ \
unsigned long internal = ACCESS_ONCE(e->internal); \
unsigned long weight = ilog2(_weight); \
unsigned long factor = ilog2(_factor); \
\
BUILD_BUG_ON(!__builtin_constant_p(_factor)); \
BUILD_BUG_ON(!__builtin_constant_p(_weight)); \
BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \
BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \
\
ACCESS_ONCE(e->internal) = internal ? \
(((internal << weight) - internal) + \
(val << factor)) >> weight : \
(val << factor); \
}
#endif /* _LINUX_AVERAGE_H */