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_FD_H_
18 #define SIMPLE_PERF_EVENT_FD_H_
20 #include <sys/types.h>
25 #include <base/macros.h>
27 #include "perf_event.h"
32 uint64_t value; // The value of the event specified by the perf_event_file.
33 uint64_t time_enabled; // The enabled time.
34 uint64_t time_running; // The running time.
35 uint64_t id; // The id of the perf_event_file.
38 // EventFd represents an opened perf_event_file.
41 static std::unique_ptr<EventFd> OpenEventFileForProcess(const EventAttr& attr, pid_t pid);
42 static std::unique_ptr<EventFd> OpenEventFileForCpu(const EventAttr& attr, int cpu);
43 static std::unique_ptr<EventFd> OpenEventFile(const EventAttr& attr, pid_t pid, int cpu);
47 // Give information about this perf_event_file, like (event_name, pid, cpu).
48 std::string Name() const;
50 // It tells the kernel to start counting and recording events specified by this file.
53 // It tells the kernel to stop counting and recording events specified by this file.
56 bool ReadCounter(PerfCounter* counter);
59 EventFd(int perf_event_fd, const std::string& event_name, pid_t pid, int cpu)
60 : perf_event_fd_(perf_event_fd), event_name_(event_name), pid_(pid), cpu_(cpu) {
64 const std::string event_name_;
68 DISALLOW_COPY_AND_ASSIGN(EventFd);
71 #endif // SIMPLE_PERF_EVENT_FD_H_