Yabin Cui | ed91cd9 | 2015-04-28 15:54:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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 SIMPLE_PERF_EVENT_SELECTION_SET_H_ |
| 18 | #define SIMPLE_PERF_EVENT_SELECTION_SET_H_ |
| 19 | |
| 20 | #include <poll.h> |
| 21 | #include <functional> |
| 22 | #include <map> |
| 23 | #include <vector> |
| 24 | |
| 25 | #include <base/macros.h> |
| 26 | |
| 27 | #include "event_fd.h" |
| 28 | #include "perf_event.h" |
| 29 | |
| 30 | struct EventType; |
| 31 | |
| 32 | // EventSelectionSet helps to monitor events. |
| 33 | // Firstly, the user creates an EventSelectionSet, and adds the specific event types to monitor. |
| 34 | // Secondly, the user defines how to monitor the events (by setting enable_on_exec flag, |
| 35 | // sample frequency, etc). |
| 36 | // Then, the user can start monitoring by ordering the EventSelectionSet to open perf event files |
| 37 | // and enable events (if enable_on_exec flag isn't used). |
| 38 | // After that, the user can read counters or read mapped event records. |
| 39 | // At last, the EventSelectionSet will clean up resources at destruction automatically. |
| 40 | |
| 41 | class EventSelectionSet { |
| 42 | public: |
| 43 | EventSelectionSet() { |
| 44 | } |
| 45 | |
| 46 | bool Empty() const { |
| 47 | return selections_.empty(); |
| 48 | } |
| 49 | |
| 50 | void AddEventType(const EventType& event_type); |
| 51 | |
| 52 | void EnableOnExec(); |
| 53 | void SampleIdAll(); |
| 54 | void SetSampleFreq(uint64_t sample_freq); |
| 55 | void SetSamplePeriod(uint64_t sample_period); |
| 56 | |
| 57 | bool OpenEventFilesForAllCpus(); |
| 58 | bool OpenEventFilesForProcess(pid_t pid); |
| 59 | bool EnableEvents(); |
| 60 | bool ReadCounters(std::map<const EventType*, std::vector<PerfCounter>>* counters_map); |
| 61 | void PreparePollForEventFiles(std::vector<pollfd>* pollfds); |
| 62 | bool MmapEventFiles(size_t mmap_pages); |
| 63 | bool ReadMmapEventData(std::function<bool(const char*, size_t)> callback); |
| 64 | |
| 65 | std::string FindEventFileNameById(uint64_t id); |
| 66 | const perf_event_attr& FindEventAttrByType(const EventType& event_type); |
| 67 | const std::vector<std::unique_ptr<EventFd>>& FindEventFdsByType(const EventType& event_type); |
| 68 | |
| 69 | private: |
| 70 | struct EventSelection { |
| 71 | const EventType* event_type; |
| 72 | perf_event_attr event_attr; |
| 73 | std::vector<std::unique_ptr<EventFd>> event_fds; |
| 74 | }; |
| 75 | EventSelection* FindSelectionByType(const EventType& event_type); |
| 76 | |
| 77 | std::vector<EventSelection> selections_; |
| 78 | |
| 79 | DISALLOW_COPY_AND_ASSIGN(EventSelectionSet); |
| 80 | }; |
| 81 | |
| 82 | #endif // SIMPLE_PERF_EVENT_SELECTION_SET_H_ |