1 /* 2 * Copyright (C) 2012 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 <errno.h> 18 #include <stdio.h> 19 #include <stdlib.h> 20 #include <unistd.h> 21 22 #include <string> 23 24 #if defined(__BIONIC__) 25 26 #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ 27 #include <sys/_system_properties.h> 28 29 #include <benchmark/benchmark.h> 30 31 // Do not exceed 512, that is about the largest number of properties 32 // that can be created with the current property area size. 33 #define TEST_NUM_PROPS \ 34 Arg(1)->Arg(4)->Arg(16)->Arg(64)->Arg(128)->Arg(256)->Arg(512) 35 36 struct LocalPropertyTestState { 37 explicit LocalPropertyTestState(int nprops) : nprops(nprops), valid(false) { 38 static const char prop_name_chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_."; 39 40 const char* android_data = getenv("ANDROID_DATA"); 41 if (android_data == NULL) { 42 printf("ANDROID_DATA environment variable not set\n"); 43 return; 44 } 45 char dir_template[PATH_MAX]; 46 snprintf(dir_template, sizeof(dir_template), "%s/local/tmp/prop-XXXXXX", android_data); 47 char* dirname = mkdtemp(dir_template); 48 if (!dirname) { 49 printf("making temp file for test state failed (is %s/local/tmp writable?): %s\n", 50 android_data, strerror(errno)); 51 return; 52 } 53 54 pa_dirname = dirname; 55 pa_filename = pa_dirname + "/__properties__"; 56 57 __system_property_set_filename(pa_filename.c_str()); 58 __system_property_area_init(); 59 60 names = new char* [nprops]; 61 name_lens = new int[nprops]; 62 values = new char* [nprops]; 63 value_lens = new int[nprops]; 64 65 srandom(nprops); 66 67 for (int i = 0; i < nprops; i++) { 68 // Make sure the name has at least 10 characters to make 69 // it very unlikely to generate the same random name. 70 name_lens[i] = (random() % (PROP_NAME_MAX - 10)) + 10; 71 names[i] = new char[PROP_NAME_MAX + 1]; 72 size_t prop_name_len = sizeof(prop_name_chars) - 1; 73 for (int j = 0; j < name_lens[i]; j++) { 74 if (j == 0 || names[i][j-1] == '.' || j == name_lens[i] - 1) { 75 // Certain values are not allowed: 76 // - Don't start name with '.' 77 // - Don't allow '.' to appear twice in a row 78 // - Don't allow the name to end with '.' 79 // This assumes that '.' is the last character in the 80 // array so that decrementing the length by one removes 81 // the value from the possible values. 82 prop_name_len--; 83 } 84 names[i][j] = prop_name_chars[random() % prop_name_len]; 85 } 86 names[i][name_lens[i]] = 0; 87 88 // Make sure the value contains at least 1 character. 89 value_lens[i] = (random() % (PROP_VALUE_MAX - 1)) + 1; 90 values[i] = new char[PROP_VALUE_MAX]; 91 for (int j = 0; j < value_lens[i]; j++) { 92 values[i][j] = prop_name_chars[random() % (sizeof(prop_name_chars) - 1)]; 93 } 94 95 if (__system_property_add(names[i], name_lens[i], values[i], value_lens[i]) < 0) { 96 printf("Failed to add a property, terminating...\n"); 97 printf("%s = %.*s\n", names[i], value_lens[i], values[i]); 98 exit(1); 99 } 100 } 101 102 valid = true; 103 } 104 105 ~LocalPropertyTestState() { 106 if (!valid) 107 return; 108 109 __system_property_set_filename(PROP_FILENAME); 110 __system_property_area_init(); 111 unlink(pa_filename.c_str()); 112 rmdir(pa_dirname.c_str()); 113 114 for (int i = 0; i < nprops; i++) { 115 delete names[i]; 116 delete values[i]; 117 } 118 delete[] names; 119 delete[] name_lens; 120 delete[] values; 121 delete[] value_lens; 122 } 123 124 public: 125 const int nprops; 126 char** names; 127 int* name_lens; 128 char** values; 129 int* value_lens; 130 bool valid; 131 132 private: 133 std::string pa_dirname; 134 std::string pa_filename; 135 }; 136 137 static void BM_property_get(benchmark::State& state) { 138 const size_t nprops = state.range(0); 139 140 LocalPropertyTestState pa(nprops); 141 if (!pa.valid) return; 142 143 while (state.KeepRunning()) { 144 char value[PROP_VALUE_MAX]; 145 __system_property_get(pa.names[random() % nprops], value); 146 } 147 } 148 BENCHMARK(BM_property_get)->TEST_NUM_PROPS; 149 150 static void BM_property_find(benchmark::State& state) { 151 const size_t nprops = state.range(0); 152 153 LocalPropertyTestState pa(nprops); 154 if (!pa.valid) return; 155 156 while (state.KeepRunning()) { 157 __system_property_find(pa.names[random() % nprops]); 158 } 159 } 160 BENCHMARK(BM_property_find)->TEST_NUM_PROPS; 161 162 static void BM_property_read(benchmark::State& state) { 163 const size_t nprops = state.range(0); 164 165 LocalPropertyTestState pa(nprops); 166 if (!pa.valid) return; 167 168 const prop_info** pinfo = new const prop_info*[nprops]; 169 char propvalue[PROP_VALUE_MAX]; 170 171 for (size_t i = 0; i < nprops; ++i) { 172 pinfo[i] = __system_property_find(pa.names[random() % nprops]); 173 } 174 175 size_t i = 0; 176 while (state.KeepRunning()) { 177 __system_property_read(pinfo[i], 0, propvalue); 178 i = (i + 1) % nprops; 179 } 180 181 delete[] pinfo; 182 } 183 BENCHMARK(BM_property_read)->TEST_NUM_PROPS; 184 185 static void BM_property_serial(benchmark::State& state) { 186 const size_t nprops = state.range(0); 187 188 LocalPropertyTestState pa(nprops); 189 if (!pa.valid) return; 190 191 const prop_info** pinfo = new const prop_info*[nprops]; 192 for (size_t i = 0; i < nprops; ++i) { 193 pinfo[i] = __system_property_find(pa.names[random() % nprops]); 194 } 195 196 size_t i = 0; 197 while (state.KeepRunning()) { 198 __system_property_serial(pinfo[i]); 199 i = (i + 1) % nprops; 200 } 201 202 delete[] pinfo; 203 } 204 BENCHMARK(BM_property_serial)->TEST_NUM_PROPS; 205 206 #endif // __BIONIC__ 207