1 /* 2 * QEMU timed average computation 3 * 4 * Copyright (C) Nodalink, EURL. 2014 5 * Copyright (C) Igalia, S.L. 2015 6 * 7 * Authors: 8 * Benoît Canet <benoit.canet@nodalink.com> 9 * Alberto Garcia <berto@igalia.com> 10 * 11 * SPDX-License-Identifier: GPL-2.0-or-later 12 * 13 * This program is free software: you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation, either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program. If not, see <http://www.gnu.org/licenses/>. 25 */ 26 27 #ifndef TIMED_AVERAGE_H 28 #define TIMED_AVERAGE_H 29 30 31 #include "qemu/timer.h" 32 33 typedef struct TimedAverageWindow TimedAverageWindow; 34 typedef struct TimedAverage TimedAverage; 35 36 /* All fields of both structures are private */ 37 38 struct TimedAverageWindow { 39 uint64_t min; /* minimum value accounted in the window */ 40 uint64_t max; /* maximum value accounted in the window */ 41 uint64_t sum; /* sum of all values */ 42 uint64_t count; /* number of values */ 43 int64_t expiration; /* the end of the current window in ns */ 44 }; 45 46 struct TimedAverage { 47 uint64_t period; /* period in nanoseconds */ 48 TimedAverageWindow windows[2]; /* two overlapping windows of with 49 * an offset of period / 2 between them */ 50 unsigned current; /* the current window index: it's also the 51 * oldest window index */ 52 QEMUClockType clock_type; /* the clock used */ 53 }; 54 55 void timed_average_init(TimedAverage *ta, QEMUClockType clock_type, 56 uint64_t period); 57 58 void timed_average_account(TimedAverage *ta, uint64_t value); 59 60 uint64_t timed_average_min(TimedAverage *ta); 61 uint64_t timed_average_avg(TimedAverage *ta); 62 uint64_t timed_average_max(TimedAverage *ta); 63 uint64_t timed_average_sum(TimedAverage *ta, uint64_t *elapsed); 64 65 #endif 66