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7fe2f639 DB |
1 | /* cpufreq-bench CPUFreq microbenchmark |
2 | * | |
3 | * Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #include <stdio.h> | |
21 | #include <time.h> | |
22 | #include <sys/time.h> | |
23 | #include <sys/types.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include <sched.h> | |
27 | ||
28 | #include <cpufreq.h> | |
ac5a181d | 29 | #include <cpupower.h> |
7fe2f639 DB |
30 | |
31 | #include "config.h" | |
32 | #include "system.h" | |
33 | ||
34 | /** | |
02af3cb5 | 35 | * returns time since epoch in µs |
7fe2f639 DB |
36 | * |
37 | * @retval time | |
38 | **/ | |
39 | ||
40 | long long int get_time() | |
41 | { | |
42 | struct timeval now; | |
43 | ||
44 | gettimeofday(&now, NULL); | |
45 | ||
46 | return (long long int)(now.tv_sec * 1000000LL + now.tv_usec); | |
47 | } | |
48 | ||
49 | /** | |
50 | * sets the cpufreq governor | |
51 | * | |
52 | * @param governor cpufreq governor name | |
53 | * @param cpu cpu for which the governor should be set | |
54 | * | |
55 | * @retval 0 on success | |
56 | * @retval -1 when failed | |
57 | **/ | |
58 | ||
59 | int set_cpufreq_governor(char *governor, unsigned int cpu) | |
60 | { | |
61 | ||
62 | dprintf("set %s as cpufreq governor\n", governor); | |
63 | ||
53d1cd6b | 64 | if (cpupower_is_cpu_online(cpu) != 1) { |
7fe2f639 DB |
65 | perror("cpufreq_cpu_exists"); |
66 | fprintf(stderr, "error: cpu %u does not exist\n", cpu); | |
67 | return -1; | |
68 | } | |
69 | ||
70 | if (cpufreq_modify_policy_governor(cpu, governor) != 0) { | |
71 | perror("cpufreq_modify_policy_governor"); | |
72 | fprintf(stderr, "error: unable to set %s governor\n", governor); | |
73 | return -1; | |
74 | } | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | /** | |
80 | * sets cpu affinity for the process | |
81 | * | |
82 | * @param cpu cpu# to which the affinity should be set | |
83 | * | |
84 | * @retval 0 on success | |
85 | * @retval -1 when setting the affinity failed | |
86 | **/ | |
87 | ||
88 | int set_cpu_affinity(unsigned int cpu) | |
89 | { | |
90 | cpu_set_t cpuset; | |
02af3cb5 | 91 | |
7fe2f639 DB |
92 | CPU_ZERO(&cpuset); |
93 | CPU_SET(cpu, &cpuset); | |
94 | ||
95 | dprintf("set affinity to cpu #%u\n", cpu); | |
96 | ||
97 | if (sched_setaffinity(getpid(), sizeof(cpu_set_t), &cpuset) < 0) { | |
98 | perror("sched_setaffinity"); | |
99 | fprintf(stderr, "warning: unable to set cpu affinity\n"); | |
100 | return -1; | |
101 | } | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | /** | |
107 | * sets the process priority parameter | |
108 | * | |
109 | * @param priority priority value | |
110 | * | |
111 | * @retval 0 on success | |
112 | * @retval -1 when setting the priority failed | |
113 | **/ | |
114 | ||
115 | int set_process_priority(int priority) | |
116 | { | |
117 | struct sched_param param; | |
118 | ||
119 | dprintf("set scheduler priority to %i\n", priority); | |
120 | ||
121 | param.sched_priority = priority; | |
122 | ||
123 | if (sched_setscheduler(0, SCHEDULER, ¶m) < 0) { | |
124 | perror("sched_setscheduler"); | |
125 | fprintf(stderr, "warning: unable to set scheduler priority\n"); | |
126 | return -1; | |
127 | } | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | /** | |
02af3cb5 | 133 | * notifies the user that the benchmark may run some time |
7fe2f639 DB |
134 | * |
135 | * @param config benchmark config values | |
136 | * | |
137 | **/ | |
138 | ||
139 | void prepare_user(const struct config *config) | |
140 | { | |
141 | unsigned long sleep_time = 0; | |
142 | unsigned long load_time = 0; | |
143 | unsigned int round; | |
144 | ||
145 | for (round = 0; round < config->rounds; round++) { | |
02af3cb5 DB |
146 | sleep_time += 2 * config->cycles * |
147 | (config->sleep + config->sleep_step * round); | |
148 | load_time += 2 * config->cycles * | |
149 | (config->load + config->load_step * round) + | |
150 | (config->load + config->load_step * round * 4); | |
7fe2f639 DB |
151 | } |
152 | ||
153 | if (config->verbose || config->output != stdout) | |
154 | printf("approx. test duration: %im\n", | |
155 | (int)((sleep_time + load_time) / 60000000)); | |
156 | } | |
157 | ||
158 | /** | |
159 | * sets up the cpu affinity and scheduler priority | |
160 | * | |
161 | * @param config benchmark config values | |
162 | * | |
163 | **/ | |
164 | ||
165 | void prepare_system(const struct config *config) | |
166 | { | |
167 | if (config->verbose) | |
168 | printf("set cpu affinity to cpu #%u\n", config->cpu); | |
169 | ||
170 | set_cpu_affinity(config->cpu); | |
171 | ||
172 | switch (config->prio) { | |
173 | case SCHED_HIGH: | |
174 | if (config->verbose) | |
175 | printf("high priority condition requested\n"); | |
176 | ||
177 | set_process_priority(PRIORITY_HIGH); | |
178 | break; | |
179 | case SCHED_LOW: | |
180 | if (config->verbose) | |
181 | printf("low priority condition requested\n"); | |
182 | ||
183 | set_process_priority(PRIORITY_LOW); | |
184 | break; | |
185 | default: | |
186 | if (config->verbose) | |
187 | printf("default priority condition requested\n"); | |
188 | ||
189 | set_process_priority(PRIORITY_DEFAULT); | |
190 | } | |
191 | } | |
192 |