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/*
* 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_FD_H_
#define SIMPLE_PERF_EVENT_FD_H_
#include <sys/types.h>
#include <memory>
#include <string>
#include <base/macros.h>
#include "perf_event.h"
class EventAttr;
struct PerfCounter {
uint64_t value; // The value of the event specified by the perf_event_file.
uint64_t time_enabled; // The enabled time.
uint64_t time_running; // The running time.
uint64_t id; // The id of the perf_event_file.
};
// EventFd represents an opened perf_event_file.
class EventFd {
public:
static std::unique_ptr<EventFd> OpenEventFileForProcess(const EventAttr& attr, pid_t pid);
static std::unique_ptr<EventFd> OpenEventFileForCpu(const EventAttr& attr, int cpu);
static std::unique_ptr<EventFd> OpenEventFile(const EventAttr& attr, pid_t pid, int cpu);
~EventFd();
// Give information about this perf_event_file, like (event_name, pid, cpu).
std::string Name() const;
// It tells the kernel to start counting and recording events specified by this file.
bool EnableEvent();
// It tells the kernel to stop counting and recording events specified by this file.
bool DisableEvent();
bool ReadCounter(PerfCounter* counter);
private:
EventFd(int perf_event_fd, const std::string& event_name, pid_t pid, int cpu)
: perf_event_fd_(perf_event_fd), event_name_(event_name), pid_(pid), cpu_(cpu) {
}
int perf_event_fd_;
const std::string event_name_;
pid_t pid_;
int cpu_;
DISALLOW_COPY_AND_ASSIGN(EventFd);
};
#endif // SIMPLE_PERF_EVENT_FD_H_
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