| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef SIMPLE_PERF_EVENT_SELECTION_SET_H_ |
| #define SIMPLE_PERF_EVENT_SELECTION_SET_H_ |
| |
| #include <poll.h> |
| #include <functional> |
| #include <map> |
| #include <vector> |
| |
| #include <base/macros.h> |
| |
| #include "event_fd.h" |
| #include "perf_event.h" |
| |
| struct EventType; |
| |
| // EventSelectionSet helps to monitor events. |
| // Firstly, the user creates an EventSelectionSet, and adds the specific event types to monitor. |
| // Secondly, the user defines how to monitor the events (by setting enable_on_exec flag, |
| // sample frequency, etc). |
| // Then, the user can start monitoring by ordering the EventSelectionSet to open perf event files |
| // and enable events (if enable_on_exec flag isn't used). |
| // After that, the user can read counters or read mapped event records. |
| // At last, the EventSelectionSet will clean up resources at destruction automatically. |
| |
| class EventSelectionSet { |
| public: |
| EventSelectionSet() { |
| } |
| |
| bool Empty() const { |
| return selections_.empty(); |
| } |
| |
| void AddEventType(const EventType& event_type); |
| |
| void EnableOnExec(); |
| void SampleIdAll(); |
| void SetSampleFreq(uint64_t sample_freq); |
| void SetSamplePeriod(uint64_t sample_period); |
| |
| bool OpenEventFilesForAllCpus(); |
| bool OpenEventFilesForProcess(pid_t pid); |
| bool EnableEvents(); |
| bool ReadCounters(std::map<const EventType*, std::vector<PerfCounter>>* counters_map); |
| void PreparePollForEventFiles(std::vector<pollfd>* pollfds); |
| bool MmapEventFiles(size_t mmap_pages); |
| bool ReadMmapEventData(std::function<bool(const char*, size_t)> callback); |
| |
| std::string FindEventFileNameById(uint64_t id); |
| const perf_event_attr& FindEventAttrByType(const EventType& event_type); |
| const std::vector<std::unique_ptr<EventFd>>& FindEventFdsByType(const EventType& event_type); |
| |
| private: |
| struct EventSelection { |
| const EventType* event_type; |
| perf_event_attr event_attr; |
| std::vector<std::unique_ptr<EventFd>> event_fds; |
| }; |
| EventSelection* FindSelectionByType(const EventType& event_type); |
| |
| std::vector<EventSelection> selections_; |
| |
| DISALLOW_COPY_AND_ASSIGN(EventSelectionSet); |
| }; |
| |
| #endif // SIMPLE_PERF_EVENT_SELECTION_SET_H_ |