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  • Committer: Package Import Robot
  • Author(s): Jamie Strandboge
  • Date: 2011-11-11 13:36:57 UTC
  • Revision ID: package-import@ubuntu.com-20111111133657-dumpedggvnmcjb2e
Tags: upstream-1.13
Import upstream version 1.13

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cpufreq.c
 
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/*
 
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 * Copyright 2007, Intel Corporation
 
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 *
 
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 * This file is part of PowerTOP
 
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 *
 
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 * This program file is free software; you can redistribute it and/or modify it
 
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 * under the terms of the GNU General Public License as published by the
 
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 * Free Software Foundation; version 2 of the License.
 
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 *
 
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 * This program is distributed in the hope that it will be useful, but WITHOUT
 
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 
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 * for more details.
 
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 *
 
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 * You should have received a copy of the GNU General Public License
 
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 * along with this program in a file named COPYING; if not, write to the
 
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 * Free Software Foundation, Inc.,
 
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 * 51 Franklin Street, Fifth Floor,
 
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 * Boston, MA 02110-1301 USA
 
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 *
 
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 * Authors:
 
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 *      Arjan van de Ven <arjan@linux.intel.com>
 
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 */
 
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#include <unistd.h>
 
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#include <stdio.h>
 
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#include <stdlib.h>
 
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#include <string.h>
 
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#include <stdint.h>
 
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#include <sys/types.h>
 
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#include <dirent.h>
 
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#include "powertop.h"
 
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static void activate_ondemand(void)
 
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{
 
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        DIR *dir;
 
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        struct dirent *dirent;
 
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        FILE *file;
 
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        char filename[PATH_MAX];
 
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        system("/sbin/modprobe cpufreq_ondemand > /dev/null 2>&1");
 
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        dir = opendir("/sys/devices/system/cpu");
 
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        if (!dir)
 
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                return;
 
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        while ((dirent = readdir(dir))) {
 
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                if (dirent->d_name[0]=='.')
 
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                        continue;
 
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                sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name);
 
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                file = fopen(filename, "w");
 
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                if (!file)
 
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                        continue;
 
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                fprintf(file, "ondemand\n");
 
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                fclose(file);
 
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        }
 
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        closedir(dir);
 
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}
 
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void suggest_ondemand_governor(void)
 
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{
 
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        DIR *dir;
 
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        struct dirent *dirent;
 
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        FILE *file;
 
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        char filename[PATH_MAX];
 
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        char line[1024];
 
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        char gov[1024];
 
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        int ret = 0;
 
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        gov[0] = 0;
 
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        dir = opendir("/sys/devices/system/cpu");
 
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        if (!dir)
 
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                return;
 
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        while ((dirent = readdir(dir))) {
 
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                if (dirent->d_name[0]=='.')
 
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                        continue;
 
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                sprintf(filename, "/sys/devices/system/cpu/%s/cpufreq/scaling_governor", dirent->d_name);
 
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                file = fopen(filename, "r");
 
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                if (!file)
 
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                        continue;
 
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                memset(line, 0, 1024);
 
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                if (fgets(line, 1023,file)==NULL) {
 
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                        fclose(file);
 
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                        continue;
 
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                }
 
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                if (strlen(gov)==0)
 
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                        strcpy(gov, line);
 
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                else
 
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                        /* if the governors are inconsistent, warn */
 
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                        if (strcmp(gov, line))
 
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                                ret = 1;
 
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                fclose(file);
 
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        }
 
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        closedir(dir);
 
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        /* if the governor is set to userspace, also warn */
 
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        if (strstr(gov, "userspace"))
 
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                ret = 1;
 
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        /* if the governor is set to performance, also warn */
 
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        /* FIXME: check if this is fair on all cpus */
 
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        if (strstr(gov, "performance"))
 
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                ret = 1;
 
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        if (ret) {
 
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                add_suggestion(_("Suggestion: Enable the ondemand cpu speed governor for all processors via: \n"
 
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                                 " echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor \n"),
 
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                                15, 'O', _(" O - enable Ondemand governor "), activate_ondemand);
 
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        }
 
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}