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 (at) 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 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 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
