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Linux/tools/power/cpupower/bench/system.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*  cpufreq-bench CPUFreq microbenchmark
  3  *
  4  *  Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de>
  5  */
  6 
  7 #include <stdio.h>
  8 #include <time.h>
  9 #include <sys/time.h>
 10 #include <sys/types.h>
 11 #include <unistd.h>
 12 
 13 #include <sched.h>
 14 
 15 #include <cpufreq.h>
 16 #include <cpupower.h>
 17 
 18 #include "config.h"
 19 #include "system.h"
 20 
 21 /**
 22  * returns time since epoch in ┬Ás
 23  *
 24  * @retval time
 25  **/
 26 
 27 long long int get_time()
 28 {
 29         struct timeval now;
 30 
 31         gettimeofday(&now, NULL);
 32 
 33         return (long long int)(now.tv_sec * 1000000LL + now.tv_usec);
 34 }
 35 
 36 /**
 37  * sets the cpufreq governor
 38  *
 39  * @param governor cpufreq governor name
 40  * @param cpu cpu for which the governor should be set
 41  *
 42  * @retval 0 on success
 43  * @retval -1 when failed
 44  **/
 45 
 46 int set_cpufreq_governor(char *governor, unsigned int cpu)
 47 {
 48 
 49         dprintf("set %s as cpufreq governor\n", governor);
 50 
 51         if (cpupower_is_cpu_online(cpu) != 1) {
 52                 perror("cpufreq_cpu_exists");
 53                 fprintf(stderr, "error: cpu %u does not exist\n", cpu);
 54                 return -1;
 55         }
 56 
 57         if (cpufreq_modify_policy_governor(cpu, governor) != 0) {
 58                 perror("cpufreq_modify_policy_governor");
 59                 fprintf(stderr, "error: unable to set %s governor\n", governor);
 60                 return -1;
 61         }
 62 
 63         return 0;
 64 }
 65 
 66 /**
 67  * sets cpu affinity for the process
 68  *
 69  * @param cpu cpu# to which the affinity should be set
 70  *
 71  * @retval 0 on success
 72  * @retval -1 when setting the affinity failed
 73  **/
 74 
 75 int set_cpu_affinity(unsigned int cpu)
 76 {
 77         cpu_set_t cpuset;
 78 
 79         CPU_ZERO(&cpuset);
 80         CPU_SET(cpu, &cpuset);
 81 
 82         dprintf("set affinity to cpu #%u\n", cpu);
 83 
 84         if (sched_setaffinity(getpid(), sizeof(cpu_set_t), &cpuset) < 0) {
 85                 perror("sched_setaffinity");
 86                 fprintf(stderr, "warning: unable to set cpu affinity\n");
 87                 return -1;
 88         }
 89 
 90         return 0;
 91 }
 92 
 93 /**
 94  * sets the process priority parameter
 95  *
 96  * @param priority priority value
 97  *
 98  * @retval 0 on success
 99  * @retval -1 when setting the priority failed
100  **/
101 
102 int set_process_priority(int priority)
103 {
104         struct sched_param param;
105 
106         dprintf("set scheduler priority to %i\n", priority);
107 
108         param.sched_priority = priority;
109 
110         if (sched_setscheduler(0, SCHEDULER, &param) < 0) {
111                 perror("sched_setscheduler");
112                 fprintf(stderr, "warning: unable to set scheduler priority\n");
113                 return -1;
114         }
115 
116         return 0;
117 }
118 
119 /**
120  * notifies the user that the benchmark may run some time
121  *
122  * @param config benchmark config values
123  *
124  **/
125 
126 void prepare_user(const struct config *config)
127 {
128         unsigned long sleep_time = 0;
129         unsigned long load_time = 0;
130         unsigned int round;
131 
132         for (round = 0; round < config->rounds; round++) {
133                 sleep_time +=  2 * config->cycles *
134                         (config->sleep + config->sleep_step * round);
135                 load_time += 2 * config->cycles *
136                         (config->load + config->load_step * round) +
137                         (config->load + config->load_step * round * 4);
138         }
139 
140         if (config->verbose || config->output != stdout)
141                 printf("approx. test duration: %im\n",
142                        (int)((sleep_time + load_time) / 60000000));
143 }
144 
145 /**
146  * sets up the cpu affinity and scheduler priority
147  *
148  * @param config benchmark config values
149  *
150  **/
151 
152 void prepare_system(const struct config *config)
153 {
154         if (config->verbose)
155                 printf("set cpu affinity to cpu #%u\n", config->cpu);
156 
157         set_cpu_affinity(config->cpu);
158 
159         switch (config->prio) {
160         case SCHED_HIGH:
161                 if (config->verbose)
162                         printf("high priority condition requested\n");
163 
164                 set_process_priority(PRIORITY_HIGH);
165                 break;
166         case SCHED_LOW:
167                 if (config->verbose)
168                         printf("low priority condition requested\n");
169 
170                 set_process_priority(PRIORITY_LOW);
171                 break;
172         default:
173                 if (config->verbose)
174                         printf("default priority condition requested\n");
175 
176                 set_process_priority(PRIORITY_DEFAULT);
177         }
178 }
179 
180 

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