1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
/*
* 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 <functional>
#include <map>
#include <unordered_map>
#include <vector>
#include <android-base/macros.h>
#include "event_fd.h"
#include "event_type.h"
#include "perf_event.h"
#include "record.h"
struct EventSelection {
uint32_t group_id;
uint32_t selection_id;
EventTypeAndModifier event_type_modifier;
perf_event_attr event_attr;
std::vector<std::unique_ptr<EventFd>> event_fds;
};
typedef std::vector<EventSelection> EventSelectionGroup;
struct CountersInfo {
const EventSelection* selection;
struct CounterInfo {
pid_t tid;
int cpu;
PerfCounter counter;
};
std::vector<CounterInfo> counters;
};
struct pollfd;
// 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 groups_.empty();
}
const std::vector<EventSelectionGroup>& groups() {
return groups_;
}
bool AddEventType(const std::string& event_name);
bool AddEventGroup(const std::vector<std::string>& event_names);
void SetEnableOnExec(bool enable);
bool GetEnableOnExec();
void SampleIdAll();
void SetSampleFreq(const EventSelection& selection, uint64_t sample_freq);
void SetSamplePeriod(const EventSelection& selection, uint64_t sample_period);
bool SetBranchSampling(uint64_t branch_sample_type);
void EnableFpCallChainSampling();
bool EnableDwarfCallChainSampling(uint32_t dump_stack_size);
void SetInherit(bool enable);
bool OpenEventFilesForCpus(const std::vector<int>& cpus);
bool OpenEventFilesForThreadsOnCpus(const std::vector<pid_t>& threads, std::vector<int> cpus);
bool ReadCounters(std::vector<CountersInfo>* counters);
bool MmapEventFiles(size_t min_mmap_pages, size_t max_mmap_pages, std::vector<pollfd>* pollfds);
void PrepareToReadMmapEventData(std::function<bool (Record*)> callback);
bool ReadMmapEventData();
bool FinishReadMmapEventData();
private:
bool BuildAndCheckEventSelection(const std::string& event_name,
EventSelection* selection);
void UnionSampleType();
bool OpenEventFiles(const std::vector<pid_t>& threads, const std::vector<int>& cpus);
bool MmapEventFiles(size_t mmap_pages, std::vector<pollfd>* pollfds, bool report_error);
bool ReadMmapEventDataForFd(std::unique_ptr<EventFd>& event_fd, const perf_event_attr& attr,
bool* has_data);
std::vector<EventSelectionGroup> groups_;
std::function<bool (Record*)> record_callback_;
std::unique_ptr<RecordCache> record_cache_;
std::unordered_map<uint64_t, const perf_event_attr*> event_id_to_attr_map_;
DISALLOW_COPY_AND_ASSIGN(EventSelectionSet);
};
bool IsBranchSamplingSupported();
bool IsDwarfCallChainSamplingSupported();
#endif // SIMPLE_PERF_EVENT_SELECTION_SET_H_
|
