2 * Copyright (C) 2015 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef SIMPLE_PERF_EVENT_SELECTION_SET_H_
18 #define SIMPLE_PERF_EVENT_SELECTION_SET_H_
25 #include <base/macros.h>
28 #include "event_type.h"
29 #include "perf_event.h"
31 // EventSelectionSet helps to monitor events.
32 // Firstly, the user creates an EventSelectionSet, and adds the specific event types to monitor.
33 // Secondly, the user defines how to monitor the events (by setting enable_on_exec flag,
34 // sample frequency, etc).
35 // Then, the user can start monitoring by ordering the EventSelectionSet to open perf event files
36 // and enable events (if enable_on_exec flag isn't used).
37 // After that, the user can read counters or read mapped event records.
38 // At last, the EventSelectionSet will clean up resources at destruction automatically.
40 class EventSelectionSet {
46 return selections_.empty();
49 bool AddEventType(const EventTypeAndModifier& event_type_modifier);
51 void SetEnableOnExec(bool enable);
52 bool GetEnableOnExec();
54 void SetSampleFreq(uint64_t sample_freq);
55 void SetSamplePeriod(uint64_t sample_period);
56 bool SetBranchSampling(uint64_t branch_sample_type);
57 void EnableFpCallChainSampling();
58 bool EnableDwarfCallChainSampling(uint32_t dump_stack_size);
59 void SetInherit(bool enable);
61 bool OpenEventFilesForAllCpus();
62 bool OpenEventFilesForThreads(const std::vector<pid_t>& threads);
63 bool OpenEventFilesForThreadsOnAllCpus(const std::vector<pid_t>& threads);
65 bool ReadCounters(std::map<const EventTypeAndModifier*, std::vector<PerfCounter>>* counters_map);
66 void PreparePollForEventFiles(std::vector<pollfd>* pollfds);
67 bool MmapEventFiles(size_t mmap_pages);
68 bool ReadMmapEventData(std::function<bool(const char*, size_t)> callback);
70 std::string FindEventFileNameById(uint64_t id);
71 const perf_event_attr& FindEventAttrByType(const EventTypeAndModifier& event_type_modifier);
72 const std::vector<std::unique_ptr<EventFd>>& FindEventFdsByType(
73 const EventTypeAndModifier& event_type_modifier);
76 bool OpenEventFiles(const std::vector<pid_t>& threads, const std::vector<int>& cpus);
78 struct EventSelection {
79 EventTypeAndModifier event_type_modifier;
80 perf_event_attr event_attr;
81 std::vector<std::unique_ptr<EventFd>> event_fds;
83 EventSelection* FindSelectionByType(const EventTypeAndModifier& event_type_modifier);
85 std::vector<EventSelection> selections_;
87 DISALLOW_COPY_AND_ASSIGN(EventSelectionSet);
90 bool IsBranchSamplingSupported();
91 bool IsDwarfCallChainSamplingSupported();
93 #endif // SIMPLE_PERF_EVENT_SELECTION_SET_H_