| /* |
| * Copyright 2010, Intel Corporation |
| * |
| * This file is part of PowerTOP |
| * |
| * This program file 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; version 2 of the License. |
| * |
| * 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 in a file named COPYING; if not, write to the |
| * Free Software Foundation, Inc, |
| * 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301 USA |
| * or just google for it. |
| * |
| * Authors: |
| * Arjan van de Ven <arjan@linux.intel.com> |
| */ |
| |
| #include "tuning.h" |
| #include "tunable.h" |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <utility> |
| #include <iostream> |
| #include <fstream> |
| #include <unistd.h> |
| #include <dirent.h> |
| #include <errno.h> |
| #include <sys/stat.h> |
| |
| #include "../lib.h" |
| #include "cpufreq.h" |
| |
| cpufreq_tunable::cpufreq_tunable(void) : tunable("", 0.3, _("Good"), _("Bad"), _("Unknown")) |
| { |
| string str; |
| sprintf(desc, _("Using 'ondemand' cpufreq governor")); |
| |
| str = read_sysfs_string("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"); |
| strcpy(original, str.c_str()); |
| if (strlen(original) < 1) |
| strcpy(original, "ondemand"); |
| } |
| |
| |
| int cpufreq_tunable::good_bad(void) |
| { |
| DIR *dir; |
| struct dirent *dirent; |
| FILE *file; |
| char filename[PATH_MAX]; |
| char line[1024]; |
| |
| char gov[1024]; |
| int ret = TUNE_GOOD; |
| |
| |
| gov[0] = 0; |
| |
| |
| dir = opendir("/sys/devices/system/cpu"); |
| if (!dir) |
| return ret; |
| |
| while ((dirent = readdir(dir))) { |
| if (dirent->d_name[0]=='.') |
| continue; |
| sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name); |
| file = fopen(filename, "r"); |
| if (!file) |
| continue; |
| memset(line, 0, 1024); |
| if (fgets(line, 1023,file)==NULL) { |
| fclose(file); |
| continue; |
| } |
| if (strlen(gov)==0) |
| strcpy(gov, line); |
| else |
| /* if the governors are inconsistent, warn */ |
| if (strcmp(gov, line)) |
| ret = TUNE_BAD; |
| fclose(file); |
| } |
| |
| closedir(dir); |
| |
| /* if the governor is set to userspace, also warn */ |
| if (strstr(gov, "userspace")) |
| ret = TUNE_BAD; |
| |
| /* if the governor is set to performance, also warn */ |
| /* FIXME: check if this is fair on all cpus */ |
| if (strstr(gov, "performance")) |
| ret = TUNE_BAD; |
| |
| return ret; |
| } |
| |
| void cpufreq_tunable::toggle(void) |
| { |
| DIR *dir; |
| struct dirent *dirent; |
| FILE *file; |
| char filename[PATH_MAX]; |
| int good; |
| good = good_bad(); |
| |
| system("/sbin/modprobe cpufreq_ondemand > /dev/null 2>&1"); |
| |
| if (good == TUNE_GOOD) { |
| dir = opendir("/sys/devices/system/cpu"); |
| if (!dir) |
| return; |
| |
| while ((dirent = readdir(dir))) { |
| if (dirent->d_name[0]=='.') |
| continue; |
| sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name); |
| file = fopen(filename, "w"); |
| if (!file) |
| continue; |
| fprintf(file, "%s\n", original); |
| fclose(file); |
| } |
| |
| closedir(dir); |
| return; |
| } |
| dir = opendir("/sys/devices/system/cpu"); |
| if (!dir) |
| return; |
| |
| while ((dirent = readdir(dir))) { |
| if (dirent->d_name[0]=='.') |
| continue; |
| sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name); |
| file = fopen(filename, "w"); |
| if (!file) |
| continue; |
| fprintf(file, "ondemand\n"); |
| fclose(file); |
| } |
| |
| closedir(dir); |
| } |
| |
| const char *cpufreq_tunable::toggle_script(void) { |
| DIR *dir; |
| struct dirent *dirent; |
| char filename[PATH_MAX]; |
| char tmp[4096]; |
| struct stat statbuf; |
| int good; |
| good = good_bad(); |
| |
| strcpy(toggle_good, "/sbin/modprobe cpufreq_ondemand > /dev/null 2>&1\n"); |
| |
| if (good == TUNE_GOOD) { |
| dir = opendir("/sys/devices/system/cpu"); |
| if (!dir) |
| return NULL; |
| |
| while ((dirent = readdir(dir))) { |
| if (dirent->d_name[0]=='.') |
| continue; |
| sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name); |
| if (stat(filename, &statbuf) == -1) |
| continue; |
| sprintf(tmp, "echo '%s' > '%s';\n", original, filename); |
| strcat(toggle_good, tmp); |
| } |
| |
| closedir(dir); |
| return toggle_good; |
| } |
| |
| dir = opendir("/sys/devices/system/cpu"); |
| if (!dir) |
| return NULL; |
| |
| while ((dirent = readdir(dir))) { |
| if (dirent->d_name[0]=='.') |
| continue; |
| sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name); |
| if (stat(filename, &statbuf) == -1) |
| continue; |
| sprintf(tmp, "echo 'ondemand' > '%s';\n", filename); |
| strcat(toggle_good, tmp); |
| } |
| |
| closedir(dir); |
| return toggle_good; |
| } |
| |
| |
| void add_cpufreq_tunable(void) |
| { |
| class cpufreq_tunable *cf; |
| |
| cf = new class cpufreq_tunable(); |
| all_tunables.push_back(cf); |
| } |