1 /* 2 * Copyright (C) 2019 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 #pragma once 18 #include <sys/types.h> 19 #include <unistd.h> 20 21 #include <string> 22 #include <vector> 23 24 // A C++ API used to control simpleperf recording. 25 namespace simpleperf { 26 27 /** 28 * RecordOptions sets record options used by ProfileSession. The options are 29 * converted to a string list in toRecordArgs(), which is then passed to 30 * `simpleperf record` cmd. Run `simpleperf record -h` or 31 * `run_simpleperf_on_device.py record -h` for help messages. 32 * 33 * Example: 34 * RecordOptions options; 35 * options.setDuration(3).recordDwarfCallGraph().setOutputFilename("perf.data"); 36 * ProfileSession session; 37 * session.startRecording(options); 38 */ 39 class RecordOptionsImpl; 40 class RecordOptions { 41 public: 42 RecordOptions(); 43 ~RecordOptions(); 44 /** 45 * Set output filename. Default is perf-<month>-<day>-<hour>-<minute>-<second>.data. 46 * The file will be generated under simpleperf_data/. 47 */ 48 RecordOptions& SetOutputFilename(const std::string& filename); 49 50 /** 51 * Set event to record. Default is cpu-cycles. See `simpleperf list` for all available events. 52 */ 53 RecordOptions& SetEvent(const std::string& event); 54 55 /** 56 * Set how many samples to generate each second running. Default is 4000. 57 */ 58 RecordOptions& SetSampleFrequency(size_t freq); 59 60 /** 61 * Set record duration. The record stops after `durationInSecond` seconds. By default, 62 * record stops only when stopRecording() is called. 63 */ 64 RecordOptions& SetDuration(double duration_in_second); 65 66 /** 67 * Record some threads in the app process. By default, record all threads in the process. 68 */ 69 RecordOptions& SetSampleThreads(const std::vector<pid_t>& threads); 70 71 /** 72 * Record dwarf based call graph. It is needed to get Java callstacks. 73 */ 74 RecordOptions& RecordDwarfCallGraph(); 75 76 /** 77 * Record frame pointer based call graph. It is suitable to get C++ callstacks on 64bit devices. 78 */ 79 RecordOptions& RecordFramePointerCallGraph(); 80 81 /** 82 * Trace context switch info to show where threads spend time off cpu. 83 */ 84 RecordOptions& TraceOffCpu(); 85 86 /** 87 * Translate record options into arguments for `simpleperf record` cmd. 88 */ 89 std::vector<std::string> ToRecordArgs() const; 90 91 private: 92 RecordOptionsImpl* impl_; 93 }; 94 95 /** 96 * ProfileSession uses `simpleperf record` cmd to generate a recording file. 97 * It allows users to start recording with some options, pause/resume recording 98 * to only profile interested code, and stop recording. 99 * 100 * Example: 101 * RecordOptions options; 102 * options.setDwarfCallGraph(); 103 * ProfileSession session; 104 * session.StartRecording(options); 105 * sleep(1); 106 * session.PauseRecording(); 107 * sleep(1); 108 * session.ResumeRecording(); 109 * sleep(1); 110 * session.StopRecording(); 111 * 112 * It aborts when error happens. To read error messages of simpleperf record 113 * process, filter logcat with `simpleperf`. 114 */ 115 class ProfileSessionImpl; 116 class ProfileSession { 117 public: 118 /** 119 * @param appDataDir the same as android.content.Context.getDataDir(). 120 * ProfileSession stores profiling data in appDataDir/simpleperf_data/. 121 */ 122 ProfileSession(const std::string& app_data_dir); 123 124 /** 125 * ProfileSession assumes appDataDir as /data/data/app_package_name. 126 */ 127 ProfileSession(); 128 ~ProfileSession(); 129 130 /** 131 * Start recording. 132 * @param options RecordOptions 133 */ 134 void StartRecording(const RecordOptions& options); 135 136 /** 137 * Start recording. 138 * @param args arguments for `simpleperf record` cmd. 139 */ 140 void StartRecording(const std::vector<std::string>& record_args); 141 142 /** 143 * Pause recording. No samples are generated in paused state. 144 */ 145 void PauseRecording(); 146 147 /** 148 * Resume a paused session. 149 */ 150 void ResumeRecording(); 151 152 /** 153 * Stop recording and generate a recording file under appDataDir/simpleperf_data/. 154 */ 155 void StopRecording(); 156 private: 157 ProfileSessionImpl* impl_; 158 }; 159 160 } // namespace simpleperf 161