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- /**
- * ewma_init() - Initialize EWMA parameters
- * @avg: Average structure
- * @factor: Factor to use for the scaled up internal value. The maximum value
- * of averages can be ULONG_MAX/(factor*weight).
- * @weight: Exponential weight, or decay rate. This defines how fast the
- * influence of older values decreases. Has to be bigger than 1.
- *
- * Initialize the EWMA parameters for a given struct ewma @avg.
- */
- void ewma_init(struct ewma *avg, unsigned long factor, unsigned long weight)
- {
- WARN_ON(weight <= 1 || factor == 0);
- avg->internal = 0;
- avg->weight = weight;
- avg->factor = factor;
- }
- EXPORT_SYMBOL(ewma_init);
- /**
- * ewma_add() - Exponentially weighted moving average (EWMA)
- * @avg: Average structure
- * @val: Current value
- *
- * Add a sample to the average.
- */
- struct ewma *ewma_add(struct ewma *avg, unsigned long val)
- {
- avg->internal = avg->internal ?
- (((avg->internal * (avg->weight - 1)) +
- (val * avg->factor)) / avg->weight) :
- (val * avg->factor);
- return avg;
- }
- EXPORT_SYMBOL(ewma_add);
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