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/*
* Copyright © 2015 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#ifndef __IGT_STATS_H__
#define __IGT_STATS_H__
#include <stdint.h>
#include <stdbool.h>
#include <math.h>
/**
* igt_stats_t:
* @values_u64: An array containing pushed integer values
* @values_f: An array containing pushed float values
* @n_values: The number of pushed values
*/
typedef struct {
union {
uint64_t *values_u64;
double *values_f;
};
unsigned int n_values;
unsigned int is_float : 1;
/*< private >*/
unsigned int capacity;
unsigned int is_population : 1;
unsigned int mean_variance_valid : 1;
unsigned int sorted_array_valid : 1;
uint64_t min, max;
double range[2];
double mean, variance;
union {
uint64_t *sorted_u64;
double *sorted_f;
};
} igt_stats_t;
void igt_stats_init(igt_stats_t *stats);
void igt_stats_init_with_size(igt_stats_t *stats, unsigned int capacity);
void igt_stats_fini(igt_stats_t *stats);
bool igt_stats_is_population(igt_stats_t *stats);
void igt_stats_set_population(igt_stats_t *stats, bool full_population);
void igt_stats_push(igt_stats_t *stats, uint64_t value);
void igt_stats_push_float(igt_stats_t *stats, double value);
void igt_stats_push_array(igt_stats_t *stats,
const uint64_t *values, unsigned int n_values);
uint64_t igt_stats_get_min(igt_stats_t *stats);
uint64_t igt_stats_get_max(igt_stats_t *stats);
uint64_t igt_stats_get_range(igt_stats_t *stats);
void igt_stats_get_quartiles(igt_stats_t *stats,
double *q1, double *q2, double *q3);
double igt_stats_get_iqr(igt_stats_t *stats);
double igt_stats_get_iqm(igt_stats_t *stats);
double igt_stats_get_mean(igt_stats_t *stats);
double igt_stats_get_trimean(igt_stats_t *stats);
double igt_stats_get_median(igt_stats_t *stats);
double igt_stats_get_variance(igt_stats_t *stats);
double igt_stats_get_std_deviation(igt_stats_t *stats);
struct igt_mean {
double mean, sq, min, max;
unsigned long count;
};
static inline void igt_mean_init(struct igt_mean *m)
{
memset(m, 0, sizeof(*m));
m->max = -HUGE_VAL;
m->min = HUGE_VAL;
}
static inline void igt_mean_add(struct igt_mean *m, double v)
{
double delta = v - m->mean;
m->mean += delta / ++m->count;
m->sq += delta * (v - m->mean);
if (v < m->min)
m->min = v;
if (v > m->max)
m->max = v;
}
static inline double igt_mean_get(struct igt_mean *m)
{
return m->mean;
}
static inline double igt_mean_get_variance(struct igt_mean *m)
{
return m->sq / m->count;
}
#endif /* __IGT_STATS_H__ */
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