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 extern void* __system_property_area__; 32 33 // Do not exceed 512, that is about the largest number of properties 34 // that can be created with the current property area size. 35 #define TEST_NUM_PROPS \ 36 Arg(1)->Arg(4)->Arg(16)->Arg(64)->Arg(128)->Arg(256)->Arg(512) 37 38 struct LocalPropertyTestState { 39 LocalPropertyTestState(int nprops) : nprops(nprops), valid(false) { 40 static const char prop_name_chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_."; 41 42 const char* android_data = getenv("ANDROID_DATA"); 43 if (android_data == NULL) { 44 printf("ANDROID_DATA environment variable not set\n"); 45 return; 46 } 47 char dir_template[PATH_MAX]; 48 snprintf(dir_template, sizeof(dir_template), "%s/local/tmp/prop-XXXXXX", android_data); 49 char* dirname = mkdtemp(dir_template); 50 if (!dirname) { 51 printf("making temp file for test state failed (is %s/local/tmp writable?): %s\n", 52 android_data, strerror(errno)); 53 return; 54 } 55 56 old_pa = __system_property_area__; 57 __system_property_area__ = NULL; 58 59 pa_dirname = dirname; 60 pa_filename = pa_dirname + "/__properties__"; 61 62 __system_property_set_filename(pa_filename.c_str()); 63 __system_property_area_init(); 64 65 names = new char* [nprops]; 66 name_lens = new int[nprops]; 67 values = new char* [nprops]; 68 value_lens = new int[nprops]; 69 70 srandom(nprops); 71 72 for (int i = 0; i < nprops; i++) { 73 // Make sure the name has at least 10 characters to make 74 // it very unlikely to generate the same random name. 75 name_lens[i] = (random() % (PROP_NAME_MAX - 10)) + 10; 76 names[i] = new char[PROP_NAME_MAX + 1]; 77 size_t prop_name_len = sizeof(prop_name_chars) - 1; 78 for (int j = 0; j < name_lens[i]; j++) { 79 if (j == 0 || names[i][j-1] == '.' || j == name_lens[i] - 1) { 80 // Certain values are not allowed: 81 // - Don't start name with '.' 82 // - Don't allow '.' to appear twice in a row 83 // - Don't allow the name to end with '.' 84 // This assumes that '.' is the last character in the 85 // array so that decrementing the length by one removes 86 // the value from the possible values. 87 prop_name_len--; 88 } 89 names[i][j] = prop_name_chars[random() % prop_name_len]; 90 } 91 names[i][name_lens[i]] = 0; 92 93 // Make sure the value contains at least 1 character. 94 value_lens[i] = (random() % (PROP_VALUE_MAX - 1)) + 1; 95 values[i] = new char[PROP_VALUE_MAX]; 96 for (int j = 0; j < value_lens[i]; j++) { 97 values[i][j] = prop_name_chars[random() % (sizeof(prop_name_chars) - 1)]; 98 } 99 100 if (__system_property_add(names[i], name_lens[i], values[i], value_lens[i]) < 0) { 101 printf("Failed to add a property, terminating...\n"); 102 printf("%s = %.*s\n", names[i], value_lens[i], values[i]); 103 exit(1); 104 } 105 } 106 107 valid = true; 108 } 109 110 ~LocalPropertyTestState() { 111 if (!valid) 112 return; 113 114 __system_property_area__ = old_pa; 115 116 __system_property_set_filename(PROP_FILENAME); 117 unlink(pa_filename.c_str()); 118 rmdir(pa_dirname.c_str()); 119 120 for (int i = 0; i < nprops; i++) { 121 delete names[i]; 122 delete values[i]; 123 } 124 delete[] names; 125 delete[] name_lens; 126 delete[] values; 127 delete[] value_lens; 128 } 129 public: 130 const int nprops; 131 char** names; 132 int* name_lens; 133 char** values; 134 int* value_lens; 135 bool valid; 136 137 private: 138 std::string pa_dirname; 139 std::string pa_filename; 140 void* old_pa; 141 }; 142 143 BENCHMARK_WITH_ARG(BM_property_get, int)->TEST_NUM_PROPS; 144 void BM_property_get::Run(int iters, int nprops) { 145 StopBenchmarkTiming(); 146 147 LocalPropertyTestState pa(nprops); 148 char value[PROP_VALUE_MAX]; 149 150 if (!pa.valid) 151 return; 152 153 srandom(iters * nprops); 154 155 StartBenchmarkTiming(); 156 157 for (int i = 0; i < iters; i++) { 158 __system_property_get(pa.names[random() % nprops], value); 159 } 160 StopBenchmarkTiming(); 161 } 162 163 BENCHMARK_WITH_ARG(BM_property_find, int)->TEST_NUM_PROPS; 164 void BM_property_find::Run(int iters, int nprops) { 165 StopBenchmarkTiming(); 166 167 LocalPropertyTestState pa(nprops); 168 169 if (!pa.valid) 170 return; 171 172 srandom(iters * nprops); 173 174 StartBenchmarkTiming(); 175 176 for (int i = 0; i < iters; i++) { 177 __system_property_find(pa.names[random() % nprops]); 178 } 179 StopBenchmarkTiming(); 180 } 181 182 BENCHMARK_WITH_ARG(BM_property_read, int)->TEST_NUM_PROPS; 183 void BM_property_read::Run(int iters, int nprops) { 184 StopBenchmarkTiming(); 185 186 LocalPropertyTestState pa(nprops); 187 188 if (!pa.valid) 189 return; 190 191 srandom(iters * nprops); 192 const prop_info** pinfo = new const prop_info*[iters]; 193 char propvalue[PROP_VALUE_MAX]; 194 195 for (int i = 0; i < iters; i++) { 196 pinfo[i] = __system_property_find(pa.names[random() % nprops]); 197 } 198 199 StartBenchmarkTiming(); 200 for (int i = 0; i < iters; i++) { 201 __system_property_read(pinfo[i], 0, propvalue); 202 } 203 StopBenchmarkTiming(); 204 205 delete[] pinfo; 206 } 207 208 BENCHMARK_WITH_ARG(BM_property_serial, int)->TEST_NUM_PROPS; 209 void BM_property_serial::Run(int iters, int nprops) { 210 StopBenchmarkTiming(); 211 212 LocalPropertyTestState pa(nprops); 213 214 if (!pa.valid) 215 return; 216 217 srandom(iters * nprops); 218 const prop_info** pinfo = new const prop_info*[iters]; 219 220 for (int i = 0; i < iters; i++) { 221 pinfo[i] = __system_property_find(pa.names[random() % nprops]); 222 } 223 224 StartBenchmarkTiming(); 225 for (int i = 0; i < iters; i++) { 226 __system_property_serial(pinfo[i]); 227 } 228 StopBenchmarkTiming(); 229 230 delete[] pinfo; 231 } 232 233 #endif // __BIONIC__ 234