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/*
* Copyright 2007, 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
*
* Authors:
* Arjan van de Ven <arjan@linux.intel.com>
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <sys/types.h>
#include <dirent.h>
#include "powertop.h"
static void activate_ondemand(void)
{
DIR *dir;
struct dirent *dirent;
FILE *file;
char filename[PATH_MAX];
system("/sbin/modprobe cpufreq_ondemand > /dev/null 2>&1");
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);
}
void suggest_ondemand_governor(void)
{
DIR *dir;
struct dirent *dirent;
FILE *file;
char filename[PATH_MAX];
char line[1024];
char gov[1024];
int ret = 0;
gov[0] = 0;
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, "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 = 1;
fclose(file);
}
closedir(dir);
/* if the governor is set to userspace, also warn */
if (strstr(gov, "userspace"))
ret = 1;
/* if the governor is set to performance, also warn */
/* FIXME: check if this is fair on all cpus */
if (strstr(gov, "performance"))
ret = 1;
if (ret) {
add_suggestion(_("Suggestion: Enable the ondemand cpu speed governor for all processors via: \n"
" echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor \n"),
15, 'O', _(" O - enable Ondemand governor "), activate_ondemand);
}
}
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