1/* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ANDROID_MEDIA_REPORTPERFORMANCE_H 18#define ANDROID_MEDIA_REPORTPERFORMANCE_H 19 20#include <deque> 21#include <map> 22#include <vector> 23 24namespace android { 25 26// The String8 class is used by reportPerformance function 27class String8; 28 29namespace ReportPerformance { 30 31constexpr int kMsPerSec = 1000; 32constexpr int kSecPerMin = 60; 33 34constexpr int kJiffyPerMs = 10; // time unit for histogram as a multiple of milliseconds 35 36// stores a histogram: key: observed buffer period (multiple of jiffy). value: count 37using Histogram = std::map<int, int>; 38 39using msInterval = double; 40using jiffyInterval = double; 41 42using timestamp = int64_t; 43 44using log_hash_t = uint64_t; 45 46static inline int deltaMs(int64_t ns1, int64_t ns2) { 47 return (ns2 - ns1) / (1000 * 1000); 48} 49 50static inline int deltaJiffy(int64_t ns1, int64_t ns2) { 51 return (kJiffyPerMs * (ns2 - ns1)) / (1000 * 1000); 52} 53 54static inline uint32_t log2(uint32_t x) { 55 // This works for x > 0 56 return 31 - __builtin_clz(x); 57} 58 59// Writes outlier intervals, timestamps, peaks timestamps, and histograms to a file. 60void writeToFile(const std::deque<std::pair<timestamp, Histogram>> &hists, 61 const std::deque<std::pair<msInterval, timestamp>> &outlierData, 62 const std::deque<timestamp> &peakTimestamps, 63 const char * kDirectory, bool append, int author, log_hash_t hash); 64 65} // namespace ReportPerformance 66 67} // namespace android 68 69#endif // ANDROID_MEDIA_REPORTPERFORMANCE_H 70