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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7fe2f639 DB |
2 | /* cpufreq-bench CPUFreq microbenchmark |
3 | * | |
4 | * Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de> | |
7fe2f639 DB |
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> | |
ac5a181d | 16 | #include <cpupower.h> |
7fe2f639 DB |
17 | |
18 | #include "config.h" | |
19 | #include "system.h" | |
20 | ||
21 | /** | |
02af3cb5 | 22 | * returns time since epoch in µs |
7fe2f639 DB |
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 | ||
53d1cd6b | 51 | if (cpupower_is_cpu_online(cpu) != 1) { |
7fe2f639 DB |
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; | |
02af3cb5 | 78 | |
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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, ¶m) < 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 | /** | |
02af3cb5 | 120 | * notifies the user that the benchmark may run some time |
7fe2f639 DB |
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++) { | |
02af3cb5 DB |
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); | |
7fe2f639 DB |
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 |