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