| 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 |