1 /* cpufreq-bench CPUFreq microbenchmark 2 * 3 * Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 */ 19 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <stdarg.h> 23 #include <string.h> 24 #include <time.h> 25 #include <dirent.h> 26 27 #include <sys/utsname.h> 28 #include <sys/types.h> 29 #include <sys/stat.h> 30 31 #include "parse.h" 32 #include "config.h" 33 34 /** 35 * converts priority string to priority 36 * 37 * @param str string that represents a scheduler priority 38 * 39 * @retval priority 40 * @retval SCHED_ERR when the priority doesn't exit 41 **/ 42 43 enum sched_prio string_to_prio(const char *str) 44 { 45 if (strncasecmp("high", str, strlen(str)) == 0) 46 return SCHED_HIGH; 47 else if (strncasecmp("default", str, strlen(str)) == 0) 48 return SCHED_DEFAULT; 49 else if (strncasecmp("low", str, strlen(str)) == 0) 50 return SCHED_LOW; 51 else 52 return SCHED_ERR; 53 } 54 55 /** 56 * create and open logfile 57 * 58 * @param dir directory in which the logfile should be created 59 * 60 * @retval logfile on success 61 * @retval NULL when the file can't be created 62 **/ 63 64 FILE *prepare_output(const char *dirname) 65 { 66 FILE *output = NULL; 67 int len; 68 char *filename; 69 struct utsname sysdata; 70 DIR *dir; 71 72 dir = opendir(dirname); 73 if (dir == NULL) { 74 if (mkdir(dirname, 0755)) { 75 perror("mkdir"); 76 fprintf(stderr, "error: Cannot create dir %s\n", 77 dirname); 78 return NULL; 79 } 80 } 81 82 len = strlen(dirname) + 30; 83 filename = malloc(sizeof(char) * len); 84 85 if (uname(&sysdata) == 0) { 86 len += strlen(sysdata.nodename) + strlen(sysdata.release); 87 filename = realloc(filename, sizeof(char) * len); 88 89 if (filename == NULL) { 90 perror("realloc"); 91 return NULL; 92 } 93 94 snprintf(filename, len - 1, "%s/benchmark_%s_%s_%li.log", 95 dirname, sysdata.nodename, sysdata.release, time(NULL)); 96 } else { 97 snprintf(filename, len - 1, "%s/benchmark_%li.log", 98 dirname, time(NULL)); 99 } 100 101 dprintf("logilename: %s\n", filename); 102 103 output = fopen(filename, "w+"); 104 if (output == NULL) { 105 perror("fopen"); 106 fprintf(stderr, "error: unable to open logfile\n"); 107 } 108 109 fprintf(stdout, "Logfile: %s\n", filename); 110 111 free(filename); 112 fprintf(output, "#round load sleep performance powersave percentage\n"); 113 return output; 114 } 115 116 /** 117 * returns the default config 118 * 119 * @retval default config on success 120 * @retval NULL when the output file can't be created 121 **/ 122 123 struct config *prepare_default_config() 124 { 125 struct config *config = malloc(sizeof(struct config)); 126 127 dprintf("loading defaults\n"); 128 129 config->sleep = 500000; 130 config->load = 500000; 131 config->sleep_step = 500000; 132 config->load_step = 500000; 133 config->cycles = 5; 134 config->rounds = 50; 135 config->cpu = 0; 136 config->prio = SCHED_HIGH; 137 config->verbose = 0; 138 strncpy(config->governor, "ondemand", 8); 139 140 config->output = stdout; 141 142 #ifdef DEFAULT_CONFIG_FILE 143 if (prepare_config(DEFAULT_CONFIG_FILE, config)) 144 return NULL; 145 #endif 146 return config; 147 } 148 149 /** 150 * parses config file and returns the config to the caller 151 * 152 * @param path config file name 153 * 154 * @retval 1 on error 155 * @retval 0 on success 156 **/ 157 158 int prepare_config(const char *path, struct config *config) 159 { 160 size_t len = 0; 161 char opt[16], val[32], *line = NULL; 162 FILE *configfile; 163 164 if (config == NULL) { 165 fprintf(stderr, "error: config is NULL\n"); 166 return 1; 167 } 168 169 configfile = fopen(path, "r"); 170 if (configfile == NULL) { 171 perror("fopen"); 172 fprintf(stderr, "error: unable to read configfile\n"); 173 free(config); 174 return 1; 175 } 176 177 while (getline(&line, &len, configfile) != -1) { 178 if (line[0] == '#' || line[0] == ' ' || line[0] == '\n') 179 continue; 180 181 if (sscanf(line, "%14s = %30s", opt, val) < 2) 182 continue; 183 184 dprintf("parsing: %s -> %s\n", opt, val); 185 186 if (strcmp("sleep", opt) == 0) 187 sscanf(val, "%li", &config->sleep); 188 189 else if (strcmp("load", opt) == 0) 190 sscanf(val, "%li", &config->load); 191 192 else if (strcmp("load_step", opt) == 0) 193 sscanf(val, "%li", &config->load_step); 194 195 else if (strcmp("sleep_step", opt) == 0) 196 sscanf(val, "%li", &config->sleep_step); 197 198 else if (strcmp("cycles", opt) == 0) 199 sscanf(val, "%u", &config->cycles); 200 201 else if (strcmp("rounds", opt) == 0) 202 sscanf(val, "%u", &config->rounds); 203 204 else if (strcmp("verbose", opt) == 0) 205 sscanf(val, "%u", &config->verbose); 206 207 else if (strcmp("output", opt) == 0) 208 config->output = prepare_output(val); 209 210 else if (strcmp("cpu", opt) == 0) 211 sscanf(val, "%u", &config->cpu); 212 213 else if (strcmp("governor", opt) == 0) { 214 strncpy(config->governor, val, 215 sizeof(config->governor)); 216 config->governor[sizeof(config->governor) - 1] = '\0'; 217 } 218 219 else if (strcmp("priority", opt) == 0) { 220 if (string_to_prio(val) != SCHED_ERR) 221 config->prio = string_to_prio(val); 222 } 223 } 224 225 free(line); 226 227 return 0; 228 } 229