191 lines
4.2 KiB
C
191 lines
4.2 KiB
C
/* cpufreq-bench CPUFreq microbenchmark
|
|
*
|
|
* Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de>
|
|
*
|
|
* This program 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <time.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include <sched.h>
|
|
|
|
#include <cpufreq.h>
|
|
|
|
#include "config.h"
|
|
#include "system.h"
|
|
|
|
/**
|
|
* returns time since epoch in µs
|
|
*
|
|
* @retval time
|
|
**/
|
|
|
|
long long int get_time()
|
|
{
|
|
struct timeval now;
|
|
|
|
gettimeofday(&now, NULL);
|
|
|
|
return (long long int)(now.tv_sec * 1000000LL + now.tv_usec);
|
|
}
|
|
|
|
/**
|
|
* sets the cpufreq governor
|
|
*
|
|
* @param governor cpufreq governor name
|
|
* @param cpu cpu for which the governor should be set
|
|
*
|
|
* @retval 0 on success
|
|
* @retval -1 when failed
|
|
**/
|
|
|
|
int set_cpufreq_governor(char *governor, unsigned int cpu)
|
|
{
|
|
|
|
dprintf("set %s as cpufreq governor\n", governor);
|
|
|
|
if (cpufreq_cpu_exists(cpu) != 0) {
|
|
perror("cpufreq_cpu_exists");
|
|
fprintf(stderr, "error: cpu %u does not exist\n", cpu);
|
|
return -1;
|
|
}
|
|
|
|
if (cpufreq_modify_policy_governor(cpu, governor) != 0) {
|
|
perror("cpufreq_modify_policy_governor");
|
|
fprintf(stderr, "error: unable to set %s governor\n", governor);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sets cpu affinity for the process
|
|
*
|
|
* @param cpu cpu# to which the affinity should be set
|
|
*
|
|
* @retval 0 on success
|
|
* @retval -1 when setting the affinity failed
|
|
**/
|
|
|
|
int set_cpu_affinity(unsigned int cpu)
|
|
{
|
|
cpu_set_t cpuset;
|
|
|
|
CPU_ZERO(&cpuset);
|
|
CPU_SET(cpu, &cpuset);
|
|
|
|
dprintf("set affinity to cpu #%u\n", cpu);
|
|
|
|
if (sched_setaffinity(getpid(), sizeof(cpu_set_t), &cpuset) < 0) {
|
|
perror("sched_setaffinity");
|
|
fprintf(stderr, "warning: unable to set cpu affinity\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sets the process priority parameter
|
|
*
|
|
* @param priority priority value
|
|
*
|
|
* @retval 0 on success
|
|
* @retval -1 when setting the priority failed
|
|
**/
|
|
|
|
int set_process_priority(int priority)
|
|
{
|
|
struct sched_param param;
|
|
|
|
dprintf("set scheduler priority to %i\n", priority);
|
|
|
|
param.sched_priority = priority;
|
|
|
|
if (sched_setscheduler(0, SCHEDULER, ¶m) < 0) {
|
|
perror("sched_setscheduler");
|
|
fprintf(stderr, "warning: unable to set scheduler priority\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* notifies the user that the benchmark may run some time
|
|
*
|
|
* @param config benchmark config values
|
|
*
|
|
**/
|
|
|
|
void prepare_user(const struct config *config)
|
|
{
|
|
unsigned long sleep_time = 0;
|
|
unsigned long load_time = 0;
|
|
unsigned int round;
|
|
|
|
for (round = 0; round < config->rounds; round++) {
|
|
sleep_time += 2 * config->cycles *
|
|
(config->sleep + config->sleep_step * round);
|
|
load_time += 2 * config->cycles *
|
|
(config->load + config->load_step * round) +
|
|
(config->load + config->load_step * round * 4);
|
|
}
|
|
|
|
if (config->verbose || config->output != stdout)
|
|
printf("approx. test duration: %im\n",
|
|
(int)((sleep_time + load_time) / 60000000));
|
|
}
|
|
|
|
/**
|
|
* sets up the cpu affinity and scheduler priority
|
|
*
|
|
* @param config benchmark config values
|
|
*
|
|
**/
|
|
|
|
void prepare_system(const struct config *config)
|
|
{
|
|
if (config->verbose)
|
|
printf("set cpu affinity to cpu #%u\n", config->cpu);
|
|
|
|
set_cpu_affinity(config->cpu);
|
|
|
|
switch (config->prio) {
|
|
case SCHED_HIGH:
|
|
if (config->verbose)
|
|
printf("high priority condition requested\n");
|
|
|
|
set_process_priority(PRIORITY_HIGH);
|
|
break;
|
|
case SCHED_LOW:
|
|
if (config->verbose)
|
|
printf("low priority condition requested\n");
|
|
|
|
set_process_priority(PRIORITY_LOW);
|
|
break;
|
|
default:
|
|
if (config->verbose)
|
|
printf("default priority condition requested\n");
|
|
|
|
set_process_priority(PRIORITY_DEFAULT);
|
|
}
|
|
}
|
|
|