1 /*
2 * Copyright 2007, Intel Corporation
3 *
4 * This file is part of PowerTOP
5 *
6 * This program file is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program in a file named COPYING; if not, write to the
17 * Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301 USA
20 *
21 * Authors:
22 * Arjan van de Ven <arjan@linux.intel.com>
23 */
24
25 #include <unistd.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdint.h>
30 #include <sys/types.h>
31 #include <dirent.h>
32
33 #include "powertop.h"
34
activate_ondemand(void)35 static void activate_ondemand(void)
36 {
37 DIR *dir;
38 struct dirent *dirent;
39 FILE *file;
40 char filename[PATH_MAX];
41
42 system("/sbin/modprobe cpufreq_ondemand &> /dev/null");
43
44
45 dir = opendir("/sys/devices/system/cpu");
46 if (!dir)
47 return;
48
49 while ((dirent = readdir(dir))) {
50 if (dirent->d_name[0]=='.')
51 continue;
52 sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name);
53 file = fopen(filename, "w");
54 if (!file)
55 continue;
56 fprintf(file, "ondemand\n");
57 fclose(file);
58 }
59
60 closedir(dir);
61 }
62
suggest_ondemand_governor(void)63 void suggest_ondemand_governor(void)
64 {
65 DIR *dir;
66 struct dirent *dirent;
67 FILE *file;
68 char filename[PATH_MAX];
69 char line[1024];
70
71 char gov[1024];
72 int ret = 0;
73
74
75 gov[0] = 0;
76
77
78 dir = opendir("/sys/devices/system/cpu");
79 if (!dir)
80 return;
81
82 while ((dirent = readdir(dir))) {
83 if (dirent->d_name[0]=='.')
84 continue;
85 sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name);
86 file = fopen(filename, "r");
87 if (!file)
88 continue;
89 memset(line, 0, 1024);
90 if (fgets(line, 1023,file)==NULL) {
91 fclose(file);
92 continue;
93 }
94 if (strlen(gov)==0)
95 strcpy(gov, line);
96 else
97 /* if the governors are inconsistent, warn */
98 if (strcmp(gov, line))
99 ret = 1;
100 fclose(file);
101 }
102
103 closedir(dir);
104
105 /* if the governor is set to userspace, also warn */
106 if (strstr(gov, "userspace"))
107 ret = 1;
108
109 /* if the governor is set to performance, also warn */
110 /* FIXME: check if this is fair on all cpus */
111 if (strstr(gov, "performance"))
112 ret = 1;
113
114
115 if (ret) {
116 add_suggestion(_("Suggestion: Enable the ondemand cpu speed governor for all processors via: \n"
117 " echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor \n"),
118 15, 'O', _(" O - enable Ondemand governor "), activate_ondemand);
119 }
120 }
121