Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / tools / power / cpupower / bench / system.c

diff --git a/kernel/tools/power/cpupower/bench/system.c b/kernel/tools/power/cpupower/bench/system.c
new file mode 100644 (file)
index 0000000..f01e3f4
--- /dev/null
+++ b/kernel/tools/power/cpupower/bench/system.c
@@ -0,0 +1,191 @@
+/*  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, &param) < 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);
+       }
+}
+