Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* cpufreq-bench CPUFreq microbenchmark
3 *
4 * Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de>
5 */
6
7#include <errno.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <stdarg.h>
11#include <string.h>
12#include <time.h>
13#include <dirent.h>
14
15#include <sys/utsname.h>
16#include <sys/types.h>
17#include <sys/stat.h>
18
19#include "parse.h"
20#include "config.h"
21
22/**
23 * converts priority string to priority
24 *
25 * @param str string that represents a scheduler priority
26 *
27 * @retval priority
28 * @retval SCHED_ERR when the priority doesn't exit
29 **/
30
31enum sched_prio string_to_prio(const char *str)
32{
33 if (strncasecmp("high", str, strlen(str)) == 0)
34 return SCHED_HIGH;
35 else if (strncasecmp("default", str, strlen(str)) == 0)
36 return SCHED_DEFAULT;
37 else if (strncasecmp("low", str, strlen(str)) == 0)
38 return SCHED_LOW;
39 else
40 return SCHED_ERR;
41}
42
43/**
44 * create and open logfile
45 *
46 * @param dir directory in which the logfile should be created
47 *
48 * @retval logfile on success
49 * @retval NULL when the file can't be created
50 **/
51
52FILE *prepare_output(const char *dirname)
53{
54 FILE *output = NULL;
55 int len;
56 char *filename, *filename_tmp;
57 struct utsname sysdata;
58 DIR *dir;
59
60 dir = opendir(dirname);
61 if (dir == NULL) {
62 if (mkdir(dirname, 0755)) {
63 perror("mkdir");
64 fprintf(stderr, "error: Cannot create dir %s\n",
65 dirname);
66 return NULL;
67 }
68 }
69
70 len = strlen(dirname) + 30;
71 filename = malloc(sizeof(char) * len);
72 if (!filename) {
73 perror("malloc");
74 goto out_dir;
75 }
76
77 if (uname(&sysdata) == 0) {
78 len += strlen(sysdata.nodename) + strlen(sysdata.release);
79 filename_tmp = realloc(filename, sizeof(*filename) * len);
80
81 if (filename_tmp == NULL) {
82 free(filename);
83 perror("realloc");
84 goto out_dir;
85 }
86
87 filename = filename_tmp;
88 snprintf(filename, len - 1, "%s/benchmark_%s_%s_%li.log",
89 dirname, sysdata.nodename, sysdata.release, time(NULL));
90 } else {
91 snprintf(filename, len - 1, "%s/benchmark_%li.log",
92 dirname, time(NULL));
93 }
94
95 dprintf("logfilename: %s\n", filename);
96
97 output = fopen(filename, "w+");
98 if (output == NULL) {
99 perror("fopen");
100 fprintf(stderr, "error: unable to open logfile\n");
101 goto out;
102 }
103
104 fprintf(stdout, "Logfile: %s\n", filename);
105
106 fprintf(output, "#round load sleep performance powersave percentage\n");
107out:
108 free(filename);
109out_dir:
110 closedir(dir);
111 return output;
112}
113
114/**
115 * returns the default config
116 *
117 * @retval default config on success
118 * @retval NULL when the output file can't be created
119 **/
120
121struct config *prepare_default_config()
122{
123 struct config *config = malloc(sizeof(struct config));
124
125 dprintf("loading defaults\n");
126
127 config->sleep = 500000;
128 config->load = 500000;
129 config->sleep_step = 500000;
130 config->load_step = 500000;
131 config->cycles = 5;
132 config->rounds = 50;
133 config->cpu = 0;
134 config->prio = SCHED_HIGH;
135 config->verbose = 0;
136 strncpy(config->governor, "ondemand", sizeof(config->governor));
137
138 config->output = stdout;
139
140#ifdef DEFAULT_CONFIG_FILE
141 if (prepare_config(DEFAULT_CONFIG_FILE, config))
142 return NULL;
143#endif
144 return config;
145}
146
147/**
148 * parses config file and returns the config to the caller
149 *
150 * @param path config file name
151 *
152 * @retval 1 on error
153 * @retval 0 on success
154 **/
155
156int prepare_config(const char *path, struct config *config)
157{
158 size_t len = 0;
159 char opt[16], val[32], *line = NULL;
160 FILE *configfile;
161
162 if (config == NULL) {
163 fprintf(stderr, "error: config is NULL\n");
164 return 1;
165 }
166
167 configfile = fopen(path, "r");
168 if (configfile == NULL) {
169 fprintf(stderr, "error: unable to read configfile: %s, %s\n",
170 path, strerror(errno));
171 free(config);
172 return 1;
173 }
174
175 while (getline(&line, &len, configfile) != -1) {
176 if (line[0] == '#' || line[0] == ' ' || line[0] == '\n')
177 continue;
178
179 if (sscanf(line, "%14s = %30s", opt, val) < 2)
180 continue;
181
182 dprintf("parsing: %s -> %s\n", opt, val);
183
184 if (strcmp("sleep", opt) == 0)
185 sscanf(val, "%li", &config->sleep);
186
187 else if (strcmp("load", opt) == 0)
188 sscanf(val, "%li", &config->load);
189
190 else if (strcmp("load_step", opt) == 0)
191 sscanf(val, "%li", &config->load_step);
192
193 else if (strcmp("sleep_step", opt) == 0)
194 sscanf(val, "%li", &config->sleep_step);
195
196 else if (strcmp("cycles", opt) == 0)
197 sscanf(val, "%u", &config->cycles);
198
199 else if (strcmp("rounds", opt) == 0)
200 sscanf(val, "%u", &config->rounds);
201
202 else if (strcmp("verbose", opt) == 0)
203 sscanf(val, "%u", &config->verbose);
204
205 else if (strcmp("output", opt) == 0)
206 config->output = prepare_output(val);
207
208 else if (strcmp("cpu", opt) == 0)
209 sscanf(val, "%u", &config->cpu);
210
211 else if (strcmp("governor", opt) == 0) {
212 strncpy(config->governor, val,
213 sizeof(config->governor));
214 config->governor[sizeof(config->governor) - 1] = '\0';
215 }
216
217 else if (strcmp("priority", opt) == 0) {
218 if (string_to_prio(val) != SCHED_ERR)
219 config->prio = string_to_prio(val);
220 }
221 }
222
223 free(line);
224
225 return 0;
226}