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/* cpufreq-bench CPUFreq microbenchmark
*
* Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <dirent.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "parse.h"
#include "config.h"
/**
* converts priority string to priority
*
* @param str string that represents a scheduler priority
*
* @retval priority
* @retval SCHED_ERR when the priority doesn't exit
**/
enum sched_prio string_to_prio(const char *str)
{
if (strncasecmp("high", str, strlen(str)) == 0)
return SCHED_HIGH;
else if (strncasecmp("default", str, strlen(str)) == 0)
return SCHED_DEFAULT;
else if (strncasecmp("low", str, strlen(str)) == 0)
return SCHED_LOW;
else
return SCHED_ERR;
}
/**
* create and open logfile
*
* @param dir directory in which the logfile should be created
*
* @retval logfile on success
* @retval NULL when the file can't be created
**/
FILE *prepare_output(const char *dirname)
{
FILE *output = NULL;
int len;
char *filename, *filename_tmp;
struct utsname sysdata;
DIR *dir;
dir = opendir(dirname);
if (dir == NULL) {
if (mkdir(dirname, 0755)) {
perror("mkdir");
fprintf(stderr, "error: Cannot create dir %s\n",
dirname);
return NULL;
}
}
len = strlen(dirname) + 30;
filename = malloc(sizeof(char) * len);
if (!filename) {
perror("malloc");
goto out_dir;
}
if (uname(&sysdata) == 0) {
len += strlen(sysdata.nodename) + strlen(sysdata.release);
filename_tmp = realloc(filename, sizeof(*filename) * len);
if (filename_tmp == NULL) {
free(filename);
perror("realloc");
goto out_dir;
}
filename = filename_tmp;
snprintf(filename, len - 1, "%s/benchmark_%s_%s_%li.log",
dirname, sysdata.nodename, sysdata.release, time(NULL));
} else {
snprintf(filename, len - 1, "%s/benchmark_%li.log",
dirname, time(NULL));
}
dprintf("logfilename: %s\n", filename);
output = fopen(filename, "w+");
if (output == NULL) {
perror("fopen");
fprintf(stderr, "error: unable to open logfile\n");
goto out;
}
fprintf(stdout, "Logfile: %s\n", filename);
fprintf(output, "#round load sleep performance powersave percentage\n");
out:
free(filename);
out_dir:
closedir(dir);
return output;
}
/**
* returns the default config
*
* @retval default config on success
* @retval NULL when the output file can't be created
**/
struct config *prepare_default_config()
{
struct config *config = malloc(sizeof(struct config));
dprintf("loading defaults\n");
config->sleep = 500000;
config->load = 500000;
config->sleep_step = 500000;
config->load_step = 500000;
config->cycles = 5;
config->rounds = 50;
config->cpu = 0;
config->prio = SCHED_HIGH;
config->verbose = 0;
strncpy(config->governor, "ondemand", 8);
config->output = stdout;
#ifdef DEFAULT_CONFIG_FILE
if (prepare_config(DEFAULT_CONFIG_FILE, config))
return NULL;
#endif
return config;
}
/**
* parses config file and returns the config to the caller
*
* @param path config file name
*
* @retval 1 on error
* @retval 0 on success
**/
int prepare_config(const char *path, struct config *config)
{
size_t len = 0;
char opt[16], val[32], *line = NULL;
FILE *configfile;
if (config == NULL) {
fprintf(stderr, "error: config is NULL\n");
return 1;
}
configfile = fopen(path, "r");
if (configfile == NULL) {
perror("fopen");
fprintf(stderr, "error: unable to read configfile\n");
free(config);
return 1;
}
while (getline(&line, &len, configfile) != -1) {
if (line[0] == '#' || line[0] == ' ' || line[0] == '\n')
continue;
if (sscanf(line, "%14s = %30s", opt, val) < 2)
continue;
dprintf("parsing: %s -> %s\n", opt, val);
if (strcmp("sleep", opt) == 0)
sscanf(val, "%li", &config->sleep);
else if (strcmp("load", opt) == 0)
sscanf(val, "%li", &config->load);
else if (strcmp("load_step", opt) == 0)
sscanf(val, "%li", &config->load_step);
else if (strcmp("sleep_step", opt) == 0)
sscanf(val, "%li", &config->sleep_step);
else if (strcmp("cycles", opt) == 0)
sscanf(val, "%u", &config->cycles);
else if (strcmp("rounds", opt) == 0)
sscanf(val, "%u", &config->rounds);
else if (strcmp("verbose", opt) == 0)
sscanf(val, "%u", &config->verbose);
else if (strcmp("output", opt) == 0)
config->output = prepare_output(val);
else if (strcmp("cpu", opt) == 0)
sscanf(val, "%u", &config->cpu);
else if (strcmp("governor", opt) == 0) {
strncpy(config->governor, val,
sizeof(config->governor));
config->governor[sizeof(config->governor) - 1] = '\0';
}
else if (strcmp("priority", opt) == 0) {
if (string_to_prio(val) != SCHED_ERR)
config->prio = string_to_prio(val);
}
}
free(line);
return 0;
}
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