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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2015 Davidlohr Bueso.
4 */
5
6/* For the CLR_() macros */
7#include <string.h>
8#include <pthread.h>
9
10#include <signal.h>
11#include "../util/stat.h"
12#include <subcmd/parse-options.h>
13#include <linux/compiler.h>
14#include <linux/kernel.h>
15#include <errno.h>
16#include "bench.h"
17#include "futex.h"
18#include "cpumap.h"
19
20#include <err.h>
21#include <stdlib.h>
22#include <sys/time.h>
23
24struct worker {
25 int tid;
26 u_int32_t *futex;
27 pthread_t thread;
28 unsigned long ops;
29};
30
31static u_int32_t global_futex = 0;
32static struct worker *worker;
33static unsigned int nsecs = 10;
34static bool silent = false, multi = false;
35static bool done = false, fshared = false;
36static unsigned int nthreads = 0;
37static int futex_flag = 0;
38struct timeval start, end, runtime;
39static pthread_mutex_t thread_lock;
40static unsigned int threads_starting;
41static struct stats throughput_stats;
42static pthread_cond_t thread_parent, thread_worker;
43
44static const struct option options[] = {
45 OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
46 OPT_UINTEGER('r', "runtime", &nsecs, "Specify runtime (in seconds)"),
47 OPT_BOOLEAN( 'M', "multi", &multi, "Use multiple futexes"),
48 OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
49 OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
50 OPT_END()
51};
52
53static const char * const bench_futex_lock_pi_usage[] = {
54 "perf bench futex lock-pi <options>",
55 NULL
56};
57
58static void print_summary(void)
59{
60 unsigned long avg = avg_stats(&throughput_stats);
61 double stddev = stddev_stats(&throughput_stats);
62
63 printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
64 !silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
65 (int) runtime.tv_sec);
66}
67
68static void toggle_done(int sig __maybe_unused,
69 siginfo_t *info __maybe_unused,
70 void *uc __maybe_unused)
71{
72 /* inform all threads that we're done for the day */
73 done = true;
74 gettimeofday(&end, NULL);
75 timersub(&end, &start, &runtime);
76}
77
78static void *workerfn(void *arg)
79{
80 struct worker *w = (struct worker *) arg;
81 unsigned long ops = w->ops;
82
83 pthread_mutex_lock(&thread_lock);
84 threads_starting--;
85 if (!threads_starting)
86 pthread_cond_signal(&thread_parent);
87 pthread_cond_wait(&thread_worker, &thread_lock);
88 pthread_mutex_unlock(&thread_lock);
89
90 do {
91 int ret;
92 again:
93 ret = futex_lock_pi(w->futex, NULL, futex_flag);
94
95 if (ret) { /* handle lock acquisition */
96 if (!silent)
97 warn("thread %d: Could not lock pi-lock for %p (%d)",
98 w->tid, w->futex, ret);
99 if (done)
100 break;
101
102 goto again;
103 }
104
105 usleep(1);
106 ret = futex_unlock_pi(w->futex, futex_flag);
107 if (ret && !silent)
108 warn("thread %d: Could not unlock pi-lock for %p (%d)",
109 w->tid, w->futex, ret);
110 ops++; /* account for thread's share of work */
111 } while (!done);
112
113 w->ops = ops;
114 return NULL;
115}
116
117static void create_threads(struct worker *w, pthread_attr_t thread_attr,
118 struct cpu_map *cpu)
119{
120 cpu_set_t cpuset;
121 unsigned int i;
122
123 threads_starting = nthreads;
124
125 for (i = 0; i < nthreads; i++) {
126 worker[i].tid = i;
127
128 if (multi) {
129 worker[i].futex = calloc(1, sizeof(u_int32_t));
130 if (!worker[i].futex)
131 err(EXIT_FAILURE, "calloc");
132 } else
133 worker[i].futex = &global_futex;
134
135 CPU_ZERO(&cpuset);
136 CPU_SET(cpu->map[i % cpu->nr], &cpuset);
137
138 if (pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpuset))
139 err(EXIT_FAILURE, "pthread_attr_setaffinity_np");
140
141 if (pthread_create(&w[i].thread, &thread_attr, workerfn, &worker[i]))
142 err(EXIT_FAILURE, "pthread_create");
143 }
144}
145
146int bench_futex_lock_pi(int argc, const char **argv)
147{
148 int ret = 0;
149 unsigned int i;
150 struct sigaction act;
151 pthread_attr_t thread_attr;
152 struct cpu_map *cpu;
153
154 argc = parse_options(argc, argv, options, bench_futex_lock_pi_usage, 0);
155 if (argc)
156 goto err;
157
158 cpu = cpu_map__new(NULL);
159 if (!cpu)
160 err(EXIT_FAILURE, "calloc");
161
162 sigfillset(&act.sa_mask);
163 act.sa_sigaction = toggle_done;
164 sigaction(SIGINT, &act, NULL);
165
166 if (!nthreads)
167 nthreads = cpu->nr;
168
169 worker = calloc(nthreads, sizeof(*worker));
170 if (!worker)
171 err(EXIT_FAILURE, "calloc");
172
173 if (!fshared)
174 futex_flag = FUTEX_PRIVATE_FLAG;
175
176 printf("Run summary [PID %d]: %d threads doing pi lock/unlock pairing for %d secs.\n\n",
177 getpid(), nthreads, nsecs);
178
179 init_stats(&throughput_stats);
180 pthread_mutex_init(&thread_lock, NULL);
181 pthread_cond_init(&thread_parent, NULL);
182 pthread_cond_init(&thread_worker, NULL);
183
184 threads_starting = nthreads;
185 pthread_attr_init(&thread_attr);
186 gettimeofday(&start, NULL);
187
188 create_threads(worker, thread_attr, cpu);
189 pthread_attr_destroy(&thread_attr);
190
191 pthread_mutex_lock(&thread_lock);
192 while (threads_starting)
193 pthread_cond_wait(&thread_parent, &thread_lock);
194 pthread_cond_broadcast(&thread_worker);
195 pthread_mutex_unlock(&thread_lock);
196
197 sleep(nsecs);
198 toggle_done(0, NULL, NULL);
199
200 for (i = 0; i < nthreads; i++) {
201 ret = pthread_join(worker[i].thread, NULL);
202 if (ret)
203 err(EXIT_FAILURE, "pthread_join");
204 }
205
206 /* cleanup & report results */
207 pthread_cond_destroy(&thread_parent);
208 pthread_cond_destroy(&thread_worker);
209 pthread_mutex_destroy(&thread_lock);
210
211 for (i = 0; i < nthreads; i++) {
212 unsigned long t = worker[i].ops/runtime.tv_sec;
213
214 update_stats(&throughput_stats, t);
215 if (!silent)
216 printf("[thread %3d] futex: %p [ %ld ops/sec ]\n",
217 worker[i].tid, worker[i].futex, t);
218
219 if (multi)
220 free(worker[i].futex);
221 }
222
223 print_summary();
224
225 free(worker);
226 return ret;
227err:
228 usage_with_options(bench_futex_lock_pi_usage, options);
229 exit(EXIT_FAILURE);
230}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2015 Davidlohr Bueso.
4 */
5
6/* For the CLR_() macros */
7#include <string.h>
8#include <pthread.h>
9
10#include <signal.h>
11#include "../util/stat.h"
12#include <subcmd/parse-options.h>
13#include <linux/compiler.h>
14#include <linux/kernel.h>
15#include <linux/zalloc.h>
16#include <errno.h>
17#include <internal/cpumap.h>
18#include <perf/cpumap.h>
19#include "bench.h"
20#include "futex.h"
21
22#include <err.h>
23#include <stdlib.h>
24#include <sys/time.h>
25
26struct worker {
27 int tid;
28 u_int32_t *futex;
29 pthread_t thread;
30 unsigned long ops;
31};
32
33static u_int32_t global_futex = 0;
34static struct worker *worker;
35static unsigned int nsecs = 10;
36static bool silent = false, multi = false;
37static bool done = false, fshared = false;
38static unsigned int nthreads = 0;
39static int futex_flag = 0;
40static pthread_mutex_t thread_lock;
41static unsigned int threads_starting;
42static struct stats throughput_stats;
43static pthread_cond_t thread_parent, thread_worker;
44
45static const struct option options[] = {
46 OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
47 OPT_UINTEGER('r', "runtime", &nsecs, "Specify runtime (in seconds)"),
48 OPT_BOOLEAN( 'M', "multi", &multi, "Use multiple futexes"),
49 OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
50 OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
51 OPT_END()
52};
53
54static const char * const bench_futex_lock_pi_usage[] = {
55 "perf bench futex lock-pi <options>",
56 NULL
57};
58
59static void print_summary(void)
60{
61 unsigned long avg = avg_stats(&throughput_stats);
62 double stddev = stddev_stats(&throughput_stats);
63
64 printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
65 !silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
66 (int)bench__runtime.tv_sec);
67}
68
69static void toggle_done(int sig __maybe_unused,
70 siginfo_t *info __maybe_unused,
71 void *uc __maybe_unused)
72{
73 /* inform all threads that we're done for the day */
74 done = true;
75 gettimeofday(&bench__end, NULL);
76 timersub(&bench__end, &bench__start, &bench__runtime);
77}
78
79static void *workerfn(void *arg)
80{
81 struct worker *w = (struct worker *) arg;
82 unsigned long ops = w->ops;
83
84 pthread_mutex_lock(&thread_lock);
85 threads_starting--;
86 if (!threads_starting)
87 pthread_cond_signal(&thread_parent);
88 pthread_cond_wait(&thread_worker, &thread_lock);
89 pthread_mutex_unlock(&thread_lock);
90
91 do {
92 int ret;
93 again:
94 ret = futex_lock_pi(w->futex, NULL, futex_flag);
95
96 if (ret) { /* handle lock acquisition */
97 if (!silent)
98 warn("thread %d: Could not lock pi-lock for %p (%d)",
99 w->tid, w->futex, ret);
100 if (done)
101 break;
102
103 goto again;
104 }
105
106 usleep(1);
107 ret = futex_unlock_pi(w->futex, futex_flag);
108 if (ret && !silent)
109 warn("thread %d: Could not unlock pi-lock for %p (%d)",
110 w->tid, w->futex, ret);
111 ops++; /* account for thread's share of work */
112 } while (!done);
113
114 w->ops = ops;
115 return NULL;
116}
117
118static void create_threads(struct worker *w, pthread_attr_t thread_attr,
119 struct perf_cpu_map *cpu)
120{
121 cpu_set_t cpuset;
122 unsigned int i;
123
124 threads_starting = nthreads;
125
126 for (i = 0; i < nthreads; i++) {
127 worker[i].tid = i;
128
129 if (multi) {
130 worker[i].futex = calloc(1, sizeof(u_int32_t));
131 if (!worker[i].futex)
132 err(EXIT_FAILURE, "calloc");
133 } else
134 worker[i].futex = &global_futex;
135
136 CPU_ZERO(&cpuset);
137 CPU_SET(cpu->map[i % cpu->nr], &cpuset);
138
139 if (pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpuset))
140 err(EXIT_FAILURE, "pthread_attr_setaffinity_np");
141
142 if (pthread_create(&w[i].thread, &thread_attr, workerfn, &worker[i]))
143 err(EXIT_FAILURE, "pthread_create");
144 }
145}
146
147int bench_futex_lock_pi(int argc, const char **argv)
148{
149 int ret = 0;
150 unsigned int i;
151 struct sigaction act;
152 pthread_attr_t thread_attr;
153 struct perf_cpu_map *cpu;
154
155 argc = parse_options(argc, argv, options, bench_futex_lock_pi_usage, 0);
156 if (argc)
157 goto err;
158
159 cpu = perf_cpu_map__new(NULL);
160 if (!cpu)
161 err(EXIT_FAILURE, "calloc");
162
163 memset(&act, 0, sizeof(act));
164 sigfillset(&act.sa_mask);
165 act.sa_sigaction = toggle_done;
166 sigaction(SIGINT, &act, NULL);
167
168 if (!nthreads)
169 nthreads = cpu->nr;
170
171 worker = calloc(nthreads, sizeof(*worker));
172 if (!worker)
173 err(EXIT_FAILURE, "calloc");
174
175 if (!fshared)
176 futex_flag = FUTEX_PRIVATE_FLAG;
177
178 printf("Run summary [PID %d]: %d threads doing pi lock/unlock pairing for %d secs.\n\n",
179 getpid(), nthreads, nsecs);
180
181 init_stats(&throughput_stats);
182 pthread_mutex_init(&thread_lock, NULL);
183 pthread_cond_init(&thread_parent, NULL);
184 pthread_cond_init(&thread_worker, NULL);
185
186 threads_starting = nthreads;
187 pthread_attr_init(&thread_attr);
188 gettimeofday(&bench__start, NULL);
189
190 create_threads(worker, thread_attr, cpu);
191 pthread_attr_destroy(&thread_attr);
192
193 pthread_mutex_lock(&thread_lock);
194 while (threads_starting)
195 pthread_cond_wait(&thread_parent, &thread_lock);
196 pthread_cond_broadcast(&thread_worker);
197 pthread_mutex_unlock(&thread_lock);
198
199 sleep(nsecs);
200 toggle_done(0, NULL, NULL);
201
202 for (i = 0; i < nthreads; i++) {
203 ret = pthread_join(worker[i].thread, NULL);
204 if (ret)
205 err(EXIT_FAILURE, "pthread_join");
206 }
207
208 /* cleanup & report results */
209 pthread_cond_destroy(&thread_parent);
210 pthread_cond_destroy(&thread_worker);
211 pthread_mutex_destroy(&thread_lock);
212
213 for (i = 0; i < nthreads; i++) {
214 unsigned long t = bench__runtime.tv_sec > 0 ?
215 worker[i].ops / bench__runtime.tv_sec : 0;
216
217 update_stats(&throughput_stats, t);
218 if (!silent)
219 printf("[thread %3d] futex: %p [ %ld ops/sec ]\n",
220 worker[i].tid, worker[i].futex, t);
221
222 if (multi)
223 zfree(&worker[i].futex);
224 }
225
226 print_summary();
227
228 free(worker);
229 return ret;
230err:
231 usage_with_options(bench_futex_lock_pi_usage, options);
232 exit(EXIT_FAILURE);
233}