linux/include/linux/average.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_AVERAGE_H
#define _LINUX_AVERAGE_H

#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/log2.h>

/*
 * Exponentially weighted moving average (EWMA)
 *
 * This implements a fixed-precision EWMA algorithm, with both the
 * precision and fall-off coefficient determined at compile-time
 * and built into the generated helper funtions.
 *
 * The first argument to the macro is the name that will be used
 * for the struct and helper functions.
 *
 * The second argument, the precision, expresses how many bits are
 * used for the fractional part of the fixed-precision values.
 *
 * The third argument, the weight reciprocal, determines how the
 * new values will be weighed vs. the old state, new values will
 * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
 * that this parameter must be a power of two for efficiency.
 */

#define DECLARE_EWMA(name, _precision, _weight_rcp) …

#endif /* _LINUX_AVERAGE_H */