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 "benchmark.h" 18 19#include <sys/syscall.h> 20#include <time.h> 21 22static void BM_time_clock_gettime(int iters) { 23 StartBenchmarkTiming(); 24 25 timespec t; 26 for (int i = 0; i < iters; ++i) { 27 clock_gettime(CLOCK_MONOTONIC, &t); 28 } 29 30 StopBenchmarkTiming(); 31} 32BENCHMARK(BM_time_clock_gettime); 33 34static void BM_time_clock_gettime_syscall(int iters) { 35 StartBenchmarkTiming(); 36 37 timespec t; 38 for (int i = 0; i < iters; ++i) { 39 syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &t); 40 } 41 42 StopBenchmarkTiming(); 43} 44BENCHMARK(BM_time_clock_gettime_syscall); 45 46static void BM_time_gettimeofday(int iters) { 47 StartBenchmarkTiming(); 48 49 timeval tv; 50 for (int i = 0; i < iters; ++i) { 51 gettimeofday(&tv, NULL); 52 } 53 54 StopBenchmarkTiming(); 55} 56BENCHMARK(BM_time_gettimeofday); 57 58static void BM_time_gettimeofday_syscall(int iters) { 59 StartBenchmarkTiming(); 60 61 timeval tv; 62 for (int i = 0; i < iters; ++i) { 63 syscall(__NR_gettimeofday, &tv, NULL); 64 } 65 66 StopBenchmarkTiming(); 67} 68BENCHMARK(BM_time_gettimeofday_syscall); 69 70static void BM_time_time(int iters) { 71 StartBenchmarkTiming(); 72 73 for (int i = 0; i < iters; ++i) { 74 time(NULL); 75 } 76 77 StopBenchmarkTiming(); 78} 79BENCHMARK(BM_time_time); 80