1 /* 2 * Copyright (c) 2025 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 #ifndef LPERF_EVENTS_H 16 #define LPERF_EVENTS_H 17 18 #include <functional> 19 #include <string> 20 #include <vector> 21 #include <linux/perf_event.h> 22 #include <poll.h> 23 24 #include "lperf_event_record.h" 25 26 namespace OHOS { 27 namespace HiviewDFX { 28 class LperfEvents { 29 public: 30 LperfEvents(); 31 ~LperfEvents(); 32 33 int PrepareRecord(); 34 int StartRecord(); 35 bool StopRecord(); 36 37 void SetTid(const std::vector<int>& tids); 38 void SetTimeOut(int timeOut); 39 void SetSampleFrequency(unsigned int frequency); 40 41 using ProcessRecordCB = std::function<void(LperfRecordSample& record)>; 42 void SetRecordCallBack(ProcessRecordCB recordCallBack); 43 void Clear(); 44 45 private: 46 struct MmapFd { 47 int fd = 0; 48 perf_event_mmap_page* mmapPage = nullptr; 49 uint8_t *buf = nullptr; 50 size_t bufSize = 0; 51 size_t dataSize = 0; 52 53 perf_event_header header = {}; 54 }; 55 56 bool PrepareFdEvents(); 57 bool AddRecordThreads(); 58 bool GetHeaderFromMmap(MmapFd& mmap); 59 void GetRecordFieldFromMmap(MmapFd& mmap, void* dest, size_t destSize, size_t pos, size_t size); 60 void GetRecordFromMmap(MmapFd& mmap); 61 void ReadRecordsFromMmaps(); 62 bool PerfEventsEnable(bool enable); 63 bool RecordLoop(); 64 65 MmapFd lperfMmap_ = {}; 66 ProcessRecordCB recordCallBack_; 67 68 int lperfFd_ = -1; 69 int timeOut_ = 0; 70 unsigned int pageSize_ = 4096; 71 unsigned int mmapPages_ = 1024; 72 unsigned int sampleFreq_ = 0; 73 std::vector<int> tids_; 74 std::vector<struct pollfd> pollFds_; 75 }; 76 } // namespace HiviewDFX 77 } // namespace OHOS 78 #endif // LPERF_EVENTS_H