2 * Copyright (C) 2016 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_PERF_CLOCK_H_
18 #define SIMPLE_PERF_PERF_CLOCK_H_
22 // Perf clock is the clock used by the kernel to generate timestamps in perf
23 // event records. We use a separate init function because it allocates a mapped
24 // buffer for perf event file, which might not be available during profiling.
25 // And we'd better call the init function before profiling.
26 // InitPerfClock() must be called before GetPerfClock().
29 uint64_t GetPerfClock();
31 #endif // SIMPLE_PERF_PERF_CLOCK_H_