1/* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17#include <sys/syscall.h> 18#include <sys/time.h> 19#include <time.h> 20#include <unistd.h> 21 22#include <benchmark/benchmark.h> 23 24static void BM_time_clock_gettime(benchmark::State& state) { 25 timespec t; 26 while (state.KeepRunning()) { 27 clock_gettime(CLOCK_MONOTONIC, &t); 28 } 29} 30BENCHMARK(BM_time_clock_gettime); 31 32static void BM_time_clock_gettime_syscall(benchmark::State& state) { 33 timespec t; 34 while (state.KeepRunning()) { 35 syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &t); 36 } 37} 38BENCHMARK(BM_time_clock_gettime_syscall); 39 40static void BM_time_gettimeofday(benchmark::State& state) { 41 timeval tv; 42 while (state.KeepRunning()) { 43 gettimeofday(&tv, NULL); 44 } 45} 46BENCHMARK(BM_time_gettimeofday); 47 48void BM_time_gettimeofday_syscall(benchmark::State& state) { 49 timeval tv; 50 while (state.KeepRunning()) { 51 syscall(__NR_gettimeofday, &tv, NULL); 52 } 53} 54BENCHMARK(BM_time_gettimeofday_syscall); 55 56void BM_time_time(benchmark::State& state) { 57 while (state.KeepRunning()) { 58 time(NULL); 59 } 60} 61BENCHMARK(BM_time_time); 62