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