blob: 08245e7a10990aa93e1526c0b13c04beb5ee51d8 [file] [log] [blame]
* QEMU timed average computation
* Copyright (C) Nodalink, EURL. 2014
* Copyright (C) Igalia, S.L. 2015
* Authors:
* BenoƮt Canet <>
* Alberto Garcia <>
* 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
* 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 <>.
#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);
uint64_t timed_average_sum(TimedAverage *ta, uint64_t *elapsed);