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