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