Commit | Line | Data |
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b257a10b MD |
1 | /* |
2 | * test_urcu.c | |
3 | * | |
4 | * Userspace RCU library - test program | |
5 | * | |
6 | * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
7 | * | |
af02d47e MD |
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. | |
b257a10b MD |
21 | */ |
22 | ||
9e97e478 | 23 | #define _GNU_SOURCE |
ac260fd9 | 24 | #include <stdio.h> |
f69f195a MD |
25 | #include <pthread.h> |
26 | #include <stdlib.h> | |
41718ff9 | 27 | #include <string.h> |
f69f195a MD |
28 | #include <sys/types.h> |
29 | #include <sys/wait.h> | |
30 | #include <unistd.h> | |
31 | #include <stdio.h> | |
41718ff9 | 32 | #include <assert.h> |
87bd15cd | 33 | #include <sys/syscall.h> |
9e97e478 | 34 | #include <sched.h> |
94b343fd | 35 | #include <errno.h> |
87bd15cd | 36 | |
ec4e58a3 | 37 | #include <urcu/arch.h> |
7685d963 | 38 | |
2a7ac59d MD |
39 | /* hardcoded number of CPUs */ |
40 | #define NR_CPUS 16384 | |
41 | ||
87bd15cd BW |
42 | #if defined(_syscall0) |
43 | _syscall0(pid_t, gettid) | |
44 | #elif defined(__NR_gettid) | |
45 | static inline pid_t gettid(void) | |
46 | { | |
47 | return syscall(__NR_gettid); | |
48 | } | |
49 | #else | |
50 | #warning "use pid as tid" | |
51 | static inline pid_t gettid(void) | |
52 | { | |
53 | return getpid(); | |
54 | } | |
55 | #endif | |
56 | ||
121a5d44 MD |
57 | #ifndef DYNAMIC_LINK_TEST |
58 | #define _LGPL_SOURCE | |
59 | #else | |
60 | #define debug_yield_read() | |
61 | #endif | |
ec4e58a3 | 62 | #include <urcu.h> |
ac260fd9 | 63 | |
41718ff9 MD |
64 | struct test_array { |
65 | int a; | |
41718ff9 MD |
66 | }; |
67 | ||
78efb485 | 68 | static volatile int test_go, test_stop; |
8c86b9a1 | 69 | |
9e31d0f0 | 70 | static unsigned long wdelay; |
bb488185 | 71 | |
41718ff9 MD |
72 | static struct test_array *test_rcu_pointer; |
73 | ||
cf380c2f | 74 | static unsigned long duration; |
cf380c2f | 75 | |
daddf5b0 | 76 | /* read-side C.S. duration, in loops */ |
8b632bab MD |
77 | static unsigned long rduration; |
78 | ||
daddf5b0 MD |
79 | static inline void loop_sleep(unsigned long l) |
80 | { | |
81 | while(l-- != 0) | |
82 | cpu_relax(); | |
83 | } | |
84 | ||
4bad7d45 MD |
85 | static int verbose_mode; |
86 | ||
87 | #define printf_verbose(fmt, args...) \ | |
88 | do { \ | |
89 | if (verbose_mode) \ | |
90 | printf(fmt, args); \ | |
91 | } while (0) | |
92 | ||
2a7ac59d MD |
93 | static unsigned int cpu_affinities[NR_CPUS]; |
94 | static unsigned int next_aff = 0; | |
95 | static int use_affinity = 0; | |
96 | ||
97 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; | |
98 | ||
99 | static void set_affinity(void) | |
100 | { | |
101 | cpu_set_t mask; | |
102 | int cpu; | |
103 | int ret; | |
104 | ||
105 | if (!use_affinity) | |
106 | return; | |
107 | ||
108 | ret = pthread_mutex_lock(&affinity_mutex); | |
109 | if (ret) { | |
110 | perror("Error in pthread mutex lock"); | |
111 | exit(-1); | |
112 | } | |
113 | cpu = cpu_affinities[next_aff++]; | |
114 | ret = pthread_mutex_unlock(&affinity_mutex); | |
115 | if (ret) { | |
116 | perror("Error in pthread mutex unlock"); | |
117 | exit(-1); | |
118 | } | |
119 | CPU_ZERO(&mask); | |
120 | CPU_SET(cpu, &mask); | |
121 | sched_setaffinity(0, sizeof(mask), &mask); | |
122 | } | |
123 | ||
cf380c2f MD |
124 | /* |
125 | * returns 0 if test should end. | |
126 | */ | |
5873cd17 | 127 | static int test_duration_write(void) |
cf380c2f | 128 | { |
78efb485 | 129 | return !test_stop; |
5873cd17 MD |
130 | } |
131 | ||
132 | static int test_duration_read(void) | |
133 | { | |
78efb485 | 134 | return !test_stop; |
cf380c2f MD |
135 | } |
136 | ||
1eec319e MD |
137 | static unsigned long long __thread nr_writes; |
138 | static unsigned long long __thread nr_reads; | |
139 | ||
8c86b9a1 MD |
140 | static unsigned int nr_readers; |
141 | static unsigned int nr_writers; | |
142 | ||
c265818b MD |
143 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
144 | ||
145 | void rcu_copy_mutex_lock(void) | |
146 | { | |
147 | int ret; | |
148 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
149 | if (ret) { | |
150 | perror("Error in pthread mutex lock"); | |
151 | exit(-1); | |
152 | } | |
153 | } | |
154 | ||
155 | void rcu_copy_mutex_unlock(void) | |
156 | { | |
157 | int ret; | |
158 | ||
159 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
160 | if (ret) { | |
161 | perror("Error in pthread mutex unlock"); | |
162 | exit(-1); | |
163 | } | |
164 | } | |
f69f195a | 165 | |
bb488185 MD |
166 | /* |
167 | * malloc/free are reusing memory areas too quickly, which does not let us | |
168 | * test races appropriately. Use a large circular array for allocations. | |
8c86b9a1 | 169 | * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail. |
bb488185 | 170 | */ |
8c86b9a1 | 171 | #define ARRAY_SIZE (1048576 * nr_writers) |
bb488185 MD |
172 | #define ARRAY_POISON 0xDEADBEEF |
173 | static int array_index; | |
8c86b9a1 | 174 | static struct test_array *test_array; |
bb488185 MD |
175 | |
176 | static struct test_array *test_array_alloc(void) | |
177 | { | |
178 | struct test_array *ret; | |
179 | int index; | |
180 | ||
181 | rcu_copy_mutex_lock(); | |
182 | index = array_index % ARRAY_SIZE; | |
183 | assert(test_array[index].a == ARRAY_POISON || | |
184 | test_array[index].a == 0); | |
185 | ret = &test_array[index]; | |
186 | array_index++; | |
187 | if (array_index == ARRAY_SIZE) | |
188 | array_index = 0; | |
189 | rcu_copy_mutex_unlock(); | |
190 | return ret; | |
191 | } | |
192 | ||
193 | static void test_array_free(struct test_array *ptr) | |
194 | { | |
195 | if (!ptr) | |
196 | return; | |
197 | rcu_copy_mutex_lock(); | |
198 | ptr->a = ARRAY_POISON; | |
199 | rcu_copy_mutex_unlock(); | |
200 | } | |
201 | ||
1eec319e | 202 | void *thr_reader(void *_count) |
f69f195a | 203 | { |
1eec319e | 204 | unsigned long long *count = _count; |
41718ff9 MD |
205 | struct test_array *local_ptr; |
206 | ||
4bad7d45 | 207 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
87bd15cd | 208 | "reader", pthread_self(), (unsigned long)gettid()); |
f69f195a | 209 | |
2a7ac59d MD |
210 | set_affinity(); |
211 | ||
121a5d44 | 212 | rcu_register_thread(); |
f69f195a | 213 | |
8c86b9a1 MD |
214 | while (!test_go) |
215 | { | |
216 | } | |
7685d963 | 217 | smp_mb(); |
8c86b9a1 | 218 | |
cf380c2f | 219 | for (;;) { |
1430ee0b | 220 | rcu_read_lock(); |
cf380c2f | 221 | local_ptr = rcu_dereference(test_rcu_pointer); |
bb488185 | 222 | debug_yield_read(); |
cf380c2f MD |
223 | if (local_ptr) |
224 | assert(local_ptr->a == 8); | |
8b632bab | 225 | if (unlikely(rduration)) |
daddf5b0 | 226 | loop_sleep(rduration); |
1430ee0b | 227 | rcu_read_unlock(); |
1eec319e | 228 | nr_reads++; |
59d5a406 | 229 | if (unlikely(!test_duration_read())) |
cf380c2f | 230 | break; |
41718ff9 | 231 | } |
f69f195a | 232 | |
121a5d44 | 233 | rcu_unregister_thread(); |
41718ff9 | 234 | |
1eec319e | 235 | *count = nr_reads; |
4bad7d45 | 236 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
cf380c2f | 237 | "reader", pthread_self(), (unsigned long)gettid()); |
f69f195a MD |
238 | return ((void*)1); |
239 | ||
240 | } | |
241 | ||
1eec319e | 242 | void *thr_writer(void *_count) |
f69f195a | 243 | { |
1eec319e | 244 | unsigned long long *count = _count; |
41718ff9 | 245 | struct test_array *new, *old; |
f69f195a | 246 | |
4bad7d45 | 247 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
87bd15cd | 248 | "writer", pthread_self(), (unsigned long)gettid()); |
f69f195a | 249 | |
2a7ac59d MD |
250 | set_affinity(); |
251 | ||
8c86b9a1 MD |
252 | while (!test_go) |
253 | { | |
254 | } | |
7685d963 | 255 | smp_mb(); |
8c86b9a1 | 256 | |
cf380c2f | 257 | for (;;) { |
bb488185 | 258 | new = test_array_alloc(); |
ad6ce6ae | 259 | new->a = 8; |
d2835e6f MD |
260 | old = rcu_xchg_pointer(&test_rcu_pointer, new); |
261 | synchronize_rcu(); | |
cf380c2f | 262 | if (old) |
8c8eed97 | 263 | old->a = 0; |
bb488185 | 264 | test_array_free(old); |
1eec319e | 265 | nr_writes++; |
59d5a406 | 266 | if (unlikely(!test_duration_write())) |
cf380c2f | 267 | break; |
59d5a406 | 268 | if (unlikely(wdelay)) |
9e31d0f0 | 269 | loop_sleep(wdelay); |
f69f195a MD |
270 | } |
271 | ||
4bad7d45 | 272 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
cf380c2f | 273 | "writer", pthread_self(), (unsigned long)gettid()); |
1eec319e | 274 | *count = nr_writes; |
f69f195a MD |
275 | return ((void*)2); |
276 | } | |
ac260fd9 | 277 | |
1430ee0b MD |
278 | void show_usage(int argc, char **argv) |
279 | { | |
8c86b9a1 | 280 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); |
1430ee0b MD |
281 | #ifdef DEBUG_YIELD |
282 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
283 | #endif | |
7685d963 | 284 | printf(" [-d delay] (writer period (us))"); |
daddf5b0 | 285 | printf(" [-c duration] (reader C.S. duration (in loops))"); |
4bad7d45 | 286 | printf(" [-v] (verbose output)"); |
9e97e478 | 287 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); |
1430ee0b MD |
288 | printf("\n"); |
289 | } | |
290 | ||
cf380c2f | 291 | int main(int argc, char **argv) |
ac260fd9 | 292 | { |
f69f195a | 293 | int err; |
8c86b9a1 | 294 | pthread_t *tid_reader, *tid_writer; |
f69f195a | 295 | void *tret; |
8c86b9a1 | 296 | unsigned long long *count_reader, *count_writer; |
1eec319e | 297 | unsigned long long tot_reads = 0, tot_writes = 0; |
9e97e478 | 298 | int i, a; |
f69f195a | 299 | |
8c86b9a1 MD |
300 | if (argc < 4) { |
301 | show_usage(argc, argv); | |
302 | return -1; | |
303 | } | |
304 | ||
305 | err = sscanf(argv[1], "%u", &nr_readers); | |
306 | if (err != 1) { | |
1430ee0b | 307 | show_usage(argc, argv); |
cf380c2f MD |
308 | return -1; |
309 | } | |
310 | ||
8c86b9a1 MD |
311 | err = sscanf(argv[2], "%u", &nr_writers); |
312 | if (err != 1) { | |
313 | show_usage(argc, argv); | |
314 | return -1; | |
315 | } | |
316 | ||
317 | err = sscanf(argv[3], "%lu", &duration); | |
cf380c2f | 318 | if (err != 1) { |
1430ee0b | 319 | show_usage(argc, argv); |
cf380c2f MD |
320 | return -1; |
321 | } | |
322 | ||
8c86b9a1 | 323 | for (i = 4; i < argc; i++) { |
cf380c2f MD |
324 | if (argv[i][0] != '-') |
325 | continue; | |
326 | switch (argv[i][1]) { | |
bb488185 | 327 | #ifdef DEBUG_YIELD |
cf380c2f MD |
328 | case 'r': |
329 | yield_active |= YIELD_READ; | |
330 | break; | |
331 | case 'w': | |
332 | yield_active |= YIELD_WRITE; | |
333 | break; | |
bb488185 | 334 | #endif |
9e97e478 MD |
335 | case 'a': |
336 | if (argc < i + 2) { | |
337 | show_usage(argc, argv); | |
338 | return -1; | |
339 | } | |
340 | a = atoi(argv[++i]); | |
2a7ac59d | 341 | cpu_affinities[next_aff++] = a; |
9e97e478 | 342 | use_affinity = 1; |
4bad7d45 | 343 | printf_verbose("Adding CPU %d affinity\n", a); |
9e97e478 | 344 | break; |
8b632bab MD |
345 | case 'c': |
346 | if (argc < i + 2) { | |
347 | show_usage(argc, argv); | |
348 | return -1; | |
349 | } | |
9e31d0f0 | 350 | rduration = atol(argv[++i]); |
8b632bab | 351 | break; |
8c86b9a1 | 352 | case 'd': |
7685d963 | 353 | if (argc < i + 2) { |
8c86b9a1 MD |
354 | show_usage(argc, argv); |
355 | return -1; | |
356 | } | |
9e31d0f0 | 357 | wdelay = atol(argv[++i]); |
bb488185 | 358 | break; |
4bad7d45 MD |
359 | case 'v': |
360 | verbose_mode = 1; | |
361 | break; | |
cf380c2f MD |
362 | } |
363 | } | |
cf380c2f | 364 | |
4bad7d45 | 365 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", |
8c86b9a1 | 366 | duration, nr_readers, nr_writers); |
9e31d0f0 | 367 | printf_verbose("Writer delay : %lu loops.\n", wdelay); |
4bad7d45 MD |
368 | printf_verbose("Reader duration : %lu loops.\n", rduration); |
369 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
87bd15cd BW |
370 | "main", pthread_self(), (unsigned long)gettid()); |
371 | ||
8c86b9a1 MD |
372 | test_array = malloc(sizeof(*test_array) * ARRAY_SIZE); |
373 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
374 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
375 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
376 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
377 | ||
2a7ac59d MD |
378 | next_aff = 0; |
379 | ||
8c86b9a1 | 380 | for (i = 0; i < nr_readers; i++) { |
1eec319e MD |
381 | err = pthread_create(&tid_reader[i], NULL, thr_reader, |
382 | &count_reader[i]); | |
f69f195a MD |
383 | if (err != 0) |
384 | exit(1); | |
385 | } | |
8c86b9a1 | 386 | for (i = 0; i < nr_writers; i++) { |
1eec319e MD |
387 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
388 | &count_writer[i]); | |
f69f195a MD |
389 | if (err != 0) |
390 | exit(1); | |
391 | } | |
392 | ||
7685d963 | 393 | smp_mb(); |
8c86b9a1 | 394 | |
78efb485 MD |
395 | test_go = 1; |
396 | ||
397 | sleep(duration); | |
398 | ||
399 | test_stop = 1; | |
400 | ||
8c86b9a1 | 401 | for (i = 0; i < nr_readers; i++) { |
f69f195a MD |
402 | err = pthread_join(tid_reader[i], &tret); |
403 | if (err != 0) | |
404 | exit(1); | |
1eec319e | 405 | tot_reads += count_reader[i]; |
f69f195a | 406 | } |
8c86b9a1 | 407 | for (i = 0; i < nr_writers; i++) { |
f69f195a MD |
408 | err = pthread_join(tid_writer[i], &tret); |
409 | if (err != 0) | |
410 | exit(1); | |
1eec319e | 411 | tot_writes += count_writer[i]; |
f69f195a | 412 | } |
5873cd17 | 413 | |
4bad7d45 | 414 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, |
1eec319e | 415 | tot_writes); |
6a190115 | 416 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " |
cda3c71d | 417 | "nr_writers %3u " |
9e31d0f0 | 418 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", |
4bad7d45 MD |
419 | argv[0], duration, nr_readers, rduration, |
420 | nr_writers, wdelay, tot_reads, tot_writes, | |
421 | tot_reads + tot_writes); | |
bb488185 | 422 | test_array_free(test_rcu_pointer); |
8c86b9a1 MD |
423 | free(test_array); |
424 | free(tid_reader); | |
425 | free(tid_writer); | |
426 | free(count_reader); | |
427 | free(count_writer); | |
f69f195a | 428 | return 0; |
ac260fd9 | 429 | } |