Deal with kernel affinity bug for tests
[urcu.git] / test_rwlock.c
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1/*
2 * test_urcu.c
3 *
4 * Userspace RCU library - test program
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
9e97e478 23#define _GNU_SOURCE
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24#include <stdio.h>
25#include <pthread.h>
26#include <stdlib.h>
27#include <string.h>
28#include <sys/types.h>
29#include <sys/wait.h>
30#include <unistd.h>
31#include <stdio.h>
32#include <assert.h>
33#include <sys/syscall.h>
9e97e478 34#include <sched.h>
10c48e14 35
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36#include "arch.h"
37
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38/* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
39#define CACHE_LINE_SIZE 4096
40
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41/* hardcoded number of CPUs */
42#define NR_CPUS 16384
43
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44#if defined(_syscall0)
45_syscall0(pid_t, gettid)
46#elif defined(__NR_gettid)
47static inline pid_t gettid(void)
48{
49 return syscall(__NR_gettid);
50}
51#else
52#warning "use pid as tid"
53static inline pid_t gettid(void)
54{
55 return getpid();
56}
57#endif
58
59#ifndef DYNAMIC_LINK_TEST
60#define _LGPL_SOURCE
61#else
62#define debug_yield_read()
63#endif
64#include "urcu.h"
65
66struct test_array {
67 int a;
68};
69
70pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
71
78efb485 72static volatile int test_go, test_stop;
10c48e14 73
9e31d0f0 74static unsigned long wdelay;
10c48e14 75
2b4e4125 76static volatile struct test_array test_array = { 8 };
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77
78static unsigned long duration;
10c48e14 79
daddf5b0 80/* read-side C.S. duration, in loops */
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81static unsigned long rduration;
82
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83static inline void loop_sleep(unsigned long l)
84{
85 while(l-- != 0)
86 cpu_relax();
87}
88
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89static int verbose_mode;
90
91#define printf_verbose(fmt, args...) \
92 do { \
93 if (verbose_mode) \
94 printf(fmt, args); \
95 } while (0)
96
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97static unsigned int cpu_affinities[NR_CPUS];
98static unsigned int next_aff = 0;
99static int use_affinity = 0;
100
101static void set_affinity(void)
102{
103 cpu_set_t mask;
104 int cpu;
105
106 if (!use_affinity)
107 return;
108
109 cpu = cpu_affinities[next_aff++];
110 CPU_ZERO(&mask);
111 CPU_SET(cpu, &mask);
112 sched_setaffinity(0, sizeof(mask), &mask);
113}
114
115
116
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117/*
118 * returns 0 if test should end.
119 */
120static int test_duration_write(void)
121{
78efb485 122 return !test_stop;
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123}
124
125static int test_duration_read(void)
126{
78efb485 127 return !test_stop;
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128}
129
130static unsigned long long __thread nr_writes;
131static unsigned long long __thread nr_reads;
132
133static unsigned int nr_readers;
134static unsigned int nr_writers;
135
136pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
137
138void rcu_copy_mutex_lock(void)
139{
140 int ret;
141 ret = pthread_mutex_lock(&rcu_copy_mutex);
142 if (ret) {
143 perror("Error in pthread mutex lock");
144 exit(-1);
145 }
146}
147
148void rcu_copy_mutex_unlock(void)
149{
150 int ret;
151
152 ret = pthread_mutex_unlock(&rcu_copy_mutex);
153 if (ret) {
154 perror("Error in pthread mutex unlock");
155 exit(-1);
156 }
157}
158
159void *thr_reader(void *_count)
160{
161 unsigned long long *count = _count;
162
4bad7d45 163 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
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164 "reader", pthread_self(), (unsigned long)gettid());
165
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166 set_affinity();
167
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168 while (!test_go)
169 {
170 }
171
172 for (;;) {
173 pthread_rwlock_rdlock(&lock);
174 assert(test_array.a == 8);
8b632bab 175 if (unlikely(rduration))
daddf5b0 176 loop_sleep(rduration);
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177 pthread_rwlock_unlock(&lock);
178 nr_reads++;
59d5a406 179 if (unlikely(!test_duration_read()))
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180 break;
181 }
182
183 *count = nr_reads;
4bad7d45 184 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
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185 "reader", pthread_self(), (unsigned long)gettid());
186 return ((void*)1);
187
188}
189
190void *thr_writer(void *_count)
191{
192 unsigned long long *count = _count;
193
4bad7d45 194 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
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195 "writer", pthread_self(), (unsigned long)gettid());
196
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197 set_affinity();
198
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199 while (!test_go)
200 {
201 }
7685d963 202 smp_mb();
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203
204 for (;;) {
205 pthread_rwlock_wrlock(&lock);
2b4e4125 206 test_array.a = 0;
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207 test_array.a = 8;
208 pthread_rwlock_unlock(&lock);
209 nr_writes++;
59d5a406 210 if (unlikely(!test_duration_write()))
10c48e14 211 break;
59d5a406 212 if (unlikely(wdelay))
9e31d0f0 213 loop_sleep(wdelay);
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214 }
215
4bad7d45 216 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
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217 "writer", pthread_self(), (unsigned long)gettid());
218 *count = nr_writes;
219 return ((void*)2);
220}
221
222void show_usage(int argc, char **argv)
223{
224 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
225#ifdef DEBUG_YIELD
226 printf(" [-r] [-w] (yield reader and/or writer)");
227#endif
7685d963 228 printf(" [-d delay] (writer period (us))");
daddf5b0 229 printf(" [-c duration] (reader C.S. duration (in loops))");
4bad7d45 230 printf(" [-v] (verbose output)");
9e97e478 231 printf(" [-a cpu#] [-a cpu#]... (affinity)");
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232 printf("\n");
233}
234
235int main(int argc, char **argv)
236{
237 int err;
238 pthread_t *tid_reader, *tid_writer;
239 void *tret;
240 unsigned long long *count_reader, *count_writer;
241 unsigned long long tot_reads = 0, tot_writes = 0;
9e97e478 242 int i, a;
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243
244 if (argc < 4) {
245 show_usage(argc, argv);
246 return -1;
247 }
7685d963 248 smp_mb();
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249
250 err = sscanf(argv[1], "%u", &nr_readers);
251 if (err != 1) {
252 show_usage(argc, argv);
253 return -1;
254 }
255
256 err = sscanf(argv[2], "%u", &nr_writers);
257 if (err != 1) {
258 show_usage(argc, argv);
259 return -1;
260 }
261
262 err = sscanf(argv[3], "%lu", &duration);
263 if (err != 1) {
264 show_usage(argc, argv);
265 return -1;
266 }
267
268 for (i = 4; i < argc; i++) {
269 if (argv[i][0] != '-')
270 continue;
271 switch (argv[i][1]) {
272#ifdef DEBUG_YIELD
273 case 'r':
274 yield_active |= YIELD_READ;
275 break;
276 case 'w':
277 yield_active |= YIELD_WRITE;
278 break;
279#endif
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280 case 'a':
281 if (argc < i + 2) {
282 show_usage(argc, argv);
283 return -1;
284 }
285 a = atoi(argv[++i]);
2a7ac59d 286 cpu_affinities[next_aff++] = a;
9e97e478 287 use_affinity = 1;
4bad7d45 288 printf_verbose("Adding CPU %d affinity\n", a);
9e97e478 289 break;
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290 case 'c':
291 if (argc < i + 2) {
292 show_usage(argc, argv);
293 return -1;
294 }
9e31d0f0 295 rduration = atol(argv[++i]);
8b632bab 296 break;
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297 case 'd':
298 if (argc < i + 2) {
299 show_usage(argc, argv);
300 return -1;
301 }
9e31d0f0 302 wdelay = atol(argv[++i]);
10c48e14 303 break;
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304 case 'v':
305 verbose_mode = 1;
306 break;
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307 }
308 }
309
4bad7d45 310 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
10c48e14 311 duration, nr_readers, nr_writers);
9e31d0f0 312 printf_verbose("Writer delay : %lu loops.\n", wdelay);
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313 printf_verbose("Reader duration : %lu loops.\n", rduration);
314 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
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315 "main", pthread_self(), (unsigned long)gettid());
316
317 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
318 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
319 count_reader = malloc(sizeof(*count_reader) * nr_readers);
320 count_writer = malloc(sizeof(*count_writer) * nr_writers);
321
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322 next_aff = 0;
323
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324 for (i = 0; i < nr_readers; i++) {
325 err = pthread_create(&tid_reader[i], NULL, thr_reader,
326 &count_reader[i]);
327 if (err != 0)
328 exit(1);
329 }
330 for (i = 0; i < nr_writers; i++) {
331 err = pthread_create(&tid_writer[i], NULL, thr_writer,
332 &count_writer[i]);
333 if (err != 0)
334 exit(1);
335 }
336
7685d963 337 smp_mb();
10c48e14 338
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339 test_go = 1;
340
341 sleep(duration);
342
343 test_stop = 1;
344
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345 for (i = 0; i < nr_readers; i++) {
346 err = pthread_join(tid_reader[i], &tret);
347 if (err != 0)
348 exit(1);
349 tot_reads += count_reader[i];
350 }
351 for (i = 0; i < nr_writers; i++) {
352 err = pthread_join(tid_writer[i], &tret);
353 if (err != 0)
354 exit(1);
355 tot_writes += count_writer[i];
356 }
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357
358 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
10c48e14 359 tot_writes);
6a190115 360 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
cda3c71d 361 "nr_writers %3u "
9e31d0f0 362 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
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363 argv[0], duration, nr_readers, rduration,
364 nr_writers, wdelay, tot_reads, tot_writes,
365 tot_reads + tot_writes);
366
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367 free(tid_reader);
368 free(tid_writer);
369 free(count_reader);
370 free(count_writer);
371 return 0;
372}
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