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/*
* QEMU timed average computation
*
* Copyright (C) Nodalink, EURL. 2014
* Copyright (C) Igalia, S.L. 2015
*
* Authors:
* Benoît Canet <benoit.canet@nodalink.com>
* Alberto Garcia <berto@igalia.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) version 3 or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TIMED_AVERAGE_H
#define TIMED_AVERAGE_H
#include <stdint.h>
#include "qemu/timer.h"
typedef struct TimedAverageWindow TimedAverageWindow;
typedef struct TimedAverage TimedAverage;
/* All fields of both structures are private */
struct TimedAverageWindow {
uint64_t min; /* minimum value accounted in the window */
uint64_t max; /* maximum value accounted in the window */
uint64_t sum; /* sum of all values */
uint64_t count; /* number of values */
int64_t expiration; /* the end of the current window in ns */
};
struct TimedAverage {
uint64_t period; /* period in nanoseconds */
TimedAverageWindow windows[2]; /* two overlapping windows of with
* an offset of period / 2 between them */
unsigned current; /* the current window index: it's also the
* oldest window index */
QEMUClockType clock_type; /* the clock used */
};
void timed_average_init(TimedAverage *ta, QEMUClockType clock_type,
uint64_t period);
void timed_average_account(TimedAverage *ta, uint64_t value);
uint64_t timed_average_min(TimedAverage *ta);
uint64_t timed_average_avg(TimedAverage *ta);
uint64_t timed_average_max(TimedAverage *ta);
#endif
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