/*
* 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_