| /* |
| * Copyright (C) 2016 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_PERF_CLOCK_H_ |
| #define SIMPLE_PERF_PERF_CLOCK_H_ |
| |
| #include <stdint.h> |
| |
| // Perf clock is the clock used by the kernel to generate timestamps in perf |
| // event records. We use a separate init function because it allocates a mapped |
| // buffer for perf event file, which might not be available during profiling. |
| // And we'd better call the init function before profiling. |
| // InitPerfClock() must be called before GetPerfClock(). |
| bool InitPerfClock(); |
| |
| uint64_t GetPerfClock(); |
| |
| #endif // SIMPLE_PERF_PERF_CLOCK_H_ |