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 |
d8540fc5 | 24 | #include "../config.h" |
ac260fd9 | 25 | #include <stdio.h> |
f69f195a MD |
26 | #include <pthread.h> |
27 | #include <stdlib.h> | |
41718ff9 | 28 | #include <string.h> |
f69f195a MD |
29 | #include <sys/types.h> |
30 | #include <sys/wait.h> | |
31 | #include <unistd.h> | |
32 | #include <stdio.h> | |
41718ff9 | 33 | #include <assert.h> |
87bd15cd | 34 | #include <sys/syscall.h> |
9e97e478 | 35 | #include <sched.h> |
94b343fd | 36 | #include <errno.h> |
87bd15cd | 37 | |
ec4e58a3 | 38 | #include <urcu/arch.h> |
7685d963 | 39 | |
2a7ac59d MD |
40 | /* hardcoded number of CPUs */ |
41 | #define NR_CPUS 16384 | |
42 | ||
87bd15cd BW |
43 | #if defined(_syscall0) |
44 | _syscall0(pid_t, gettid) | |
45 | #elif defined(__NR_gettid) | |
46 | static inline pid_t gettid(void) | |
47 | { | |
48 | return syscall(__NR_gettid); | |
49 | } | |
50 | #else | |
51 | #warning "use pid as tid" | |
52 | static inline pid_t gettid(void) | |
53 | { | |
54 | return getpid(); | |
55 | } | |
56 | #endif | |
57 | ||
121a5d44 MD |
58 | #ifndef DYNAMIC_LINK_TEST |
59 | #define _LGPL_SOURCE | |
60 | #else | |
61 | #define debug_yield_read() | |
62 | #endif | |
ec4e58a3 | 63 | #include <urcu.h> |
ac260fd9 | 64 | |
41718ff9 MD |
65 | struct test_array { |
66 | int a; | |
41718ff9 MD |
67 | }; |
68 | ||
78efb485 | 69 | static volatile int test_go, test_stop; |
8c86b9a1 | 70 | |
9e31d0f0 | 71 | static unsigned long wdelay; |
bb488185 | 72 | |
41718ff9 MD |
73 | static struct test_array *test_rcu_pointer; |
74 | ||
cf380c2f | 75 | static unsigned long duration; |
cf380c2f | 76 | |
daddf5b0 | 77 | /* read-side C.S. duration, in loops */ |
8b632bab MD |
78 | static unsigned long rduration; |
79 | ||
daddf5b0 MD |
80 | static inline void loop_sleep(unsigned long l) |
81 | { | |
82 | while(l-- != 0) | |
83 | cpu_relax(); | |
84 | } | |
85 | ||
4bad7d45 MD |
86 | static int verbose_mode; |
87 | ||
88 | #define printf_verbose(fmt, args...) \ | |
89 | do { \ | |
90 | if (verbose_mode) \ | |
91 | printf(fmt, args); \ | |
92 | } while (0) | |
93 | ||
2a7ac59d MD |
94 | static unsigned int cpu_affinities[NR_CPUS]; |
95 | static unsigned int next_aff = 0; | |
96 | static int use_affinity = 0; | |
97 | ||
98 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; | |
99 | ||
d8540fc5 PA |
100 | #ifndef HAVE_CPU_SET_T |
101 | typedef unsigned long cpu_set_t; | |
102 | # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0) | |
103 | # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0) | |
104 | #endif | |
105 | ||
2a7ac59d MD |
106 | static void set_affinity(void) |
107 | { | |
108 | cpu_set_t mask; | |
109 | int cpu; | |
110 | int ret; | |
111 | ||
112 | if (!use_affinity) | |
113 | return; | |
114 | ||
d8540fc5 | 115 | #if HAVE_SCHED_SETAFFINITY |
2a7ac59d MD |
116 | ret = pthread_mutex_lock(&affinity_mutex); |
117 | if (ret) { | |
118 | perror("Error in pthread mutex lock"); | |
119 | exit(-1); | |
120 | } | |
121 | cpu = cpu_affinities[next_aff++]; | |
122 | ret = pthread_mutex_unlock(&affinity_mutex); | |
123 | if (ret) { | |
124 | perror("Error in pthread mutex unlock"); | |
125 | exit(-1); | |
126 | } | |
d8540fc5 | 127 | |
2a7ac59d MD |
128 | CPU_ZERO(&mask); |
129 | CPU_SET(cpu, &mask); | |
d8540fc5 PA |
130 | #if SCHED_SETAFFINITY_ARGS == 2 |
131 | sched_setaffinity(0, &mask); | |
132 | #else | |
2a7ac59d | 133 | sched_setaffinity(0, sizeof(mask), &mask); |
d8540fc5 PA |
134 | #endif |
135 | #endif /* HAVE_SCHED_SETAFFINITY */ | |
2a7ac59d MD |
136 | } |
137 | ||
cf380c2f MD |
138 | /* |
139 | * returns 0 if test should end. | |
140 | */ | |
5873cd17 | 141 | static int test_duration_write(void) |
cf380c2f | 142 | { |
78efb485 | 143 | return !test_stop; |
5873cd17 MD |
144 | } |
145 | ||
146 | static int test_duration_read(void) | |
147 | { | |
78efb485 | 148 | return !test_stop; |
cf380c2f MD |
149 | } |
150 | ||
1eec319e MD |
151 | static unsigned long long __thread nr_writes; |
152 | static unsigned long long __thread nr_reads; | |
153 | ||
8c86b9a1 MD |
154 | static unsigned int nr_readers; |
155 | static unsigned int nr_writers; | |
156 | ||
c265818b MD |
157 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
158 | ||
159 | void rcu_copy_mutex_lock(void) | |
160 | { | |
161 | int ret; | |
162 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
163 | if (ret) { | |
164 | perror("Error in pthread mutex lock"); | |
165 | exit(-1); | |
166 | } | |
167 | } | |
168 | ||
169 | void rcu_copy_mutex_unlock(void) | |
170 | { | |
171 | int ret; | |
172 | ||
173 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
174 | if (ret) { | |
175 | perror("Error in pthread mutex unlock"); | |
176 | exit(-1); | |
177 | } | |
178 | } | |
f69f195a | 179 | |
bb488185 MD |
180 | /* |
181 | * malloc/free are reusing memory areas too quickly, which does not let us | |
182 | * test races appropriately. Use a large circular array for allocations. | |
8c86b9a1 | 183 | * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail. |
bb488185 | 184 | */ |
8c86b9a1 | 185 | #define ARRAY_SIZE (1048576 * nr_writers) |
bb488185 MD |
186 | #define ARRAY_POISON 0xDEADBEEF |
187 | static int array_index; | |
8c86b9a1 | 188 | static struct test_array *test_array; |
bb488185 MD |
189 | |
190 | static struct test_array *test_array_alloc(void) | |
191 | { | |
192 | struct test_array *ret; | |
193 | int index; | |
194 | ||
195 | rcu_copy_mutex_lock(); | |
196 | index = array_index % ARRAY_SIZE; | |
197 | assert(test_array[index].a == ARRAY_POISON || | |
198 | test_array[index].a == 0); | |
199 | ret = &test_array[index]; | |
200 | array_index++; | |
201 | if (array_index == ARRAY_SIZE) | |
202 | array_index = 0; | |
203 | rcu_copy_mutex_unlock(); | |
204 | return ret; | |
205 | } | |
206 | ||
207 | static void test_array_free(struct test_array *ptr) | |
208 | { | |
209 | if (!ptr) | |
210 | return; | |
211 | rcu_copy_mutex_lock(); | |
212 | ptr->a = ARRAY_POISON; | |
213 | rcu_copy_mutex_unlock(); | |
214 | } | |
215 | ||
1eec319e | 216 | void *thr_reader(void *_count) |
f69f195a | 217 | { |
1eec319e | 218 | unsigned long long *count = _count; |
41718ff9 MD |
219 | struct test_array *local_ptr; |
220 | ||
4bad7d45 | 221 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
87bd15cd | 222 | "reader", pthread_self(), (unsigned long)gettid()); |
f69f195a | 223 | |
2a7ac59d MD |
224 | set_affinity(); |
225 | ||
121a5d44 | 226 | rcu_register_thread(); |
f69f195a | 227 | |
8c86b9a1 MD |
228 | while (!test_go) |
229 | { | |
230 | } | |
7685d963 | 231 | smp_mb(); |
8c86b9a1 | 232 | |
cf380c2f | 233 | for (;;) { |
1430ee0b | 234 | rcu_read_lock(); |
cf380c2f | 235 | local_ptr = rcu_dereference(test_rcu_pointer); |
bb488185 | 236 | debug_yield_read(); |
cf380c2f MD |
237 | if (local_ptr) |
238 | assert(local_ptr->a == 8); | |
8b632bab | 239 | if (unlikely(rduration)) |
daddf5b0 | 240 | loop_sleep(rduration); |
1430ee0b | 241 | rcu_read_unlock(); |
1eec319e | 242 | nr_reads++; |
59d5a406 | 243 | if (unlikely(!test_duration_read())) |
cf380c2f | 244 | break; |
41718ff9 | 245 | } |
f69f195a | 246 | |
121a5d44 | 247 | rcu_unregister_thread(); |
41718ff9 | 248 | |
1eec319e | 249 | *count = nr_reads; |
4bad7d45 | 250 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
cf380c2f | 251 | "reader", pthread_self(), (unsigned long)gettid()); |
f69f195a MD |
252 | return ((void*)1); |
253 | ||
254 | } | |
255 | ||
1eec319e | 256 | void *thr_writer(void *_count) |
f69f195a | 257 | { |
1eec319e | 258 | unsigned long long *count = _count; |
41718ff9 | 259 | struct test_array *new, *old; |
f69f195a | 260 | |
4bad7d45 | 261 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
87bd15cd | 262 | "writer", pthread_self(), (unsigned long)gettid()); |
f69f195a | 263 | |
2a7ac59d MD |
264 | set_affinity(); |
265 | ||
8c86b9a1 MD |
266 | while (!test_go) |
267 | { | |
268 | } | |
7685d963 | 269 | smp_mb(); |
8c86b9a1 | 270 | |
cf380c2f | 271 | for (;;) { |
bb488185 | 272 | new = test_array_alloc(); |
ad6ce6ae | 273 | new->a = 8; |
d2835e6f MD |
274 | old = rcu_xchg_pointer(&test_rcu_pointer, new); |
275 | synchronize_rcu(); | |
cf380c2f | 276 | if (old) |
8c8eed97 | 277 | old->a = 0; |
bb488185 | 278 | test_array_free(old); |
1eec319e | 279 | nr_writes++; |
59d5a406 | 280 | if (unlikely(!test_duration_write())) |
cf380c2f | 281 | break; |
59d5a406 | 282 | if (unlikely(wdelay)) |
9e31d0f0 | 283 | loop_sleep(wdelay); |
f69f195a MD |
284 | } |
285 | ||
4bad7d45 | 286 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
cf380c2f | 287 | "writer", pthread_self(), (unsigned long)gettid()); |
1eec319e | 288 | *count = nr_writes; |
f69f195a MD |
289 | return ((void*)2); |
290 | } | |
ac260fd9 | 291 | |
1430ee0b MD |
292 | void show_usage(int argc, char **argv) |
293 | { | |
8c86b9a1 | 294 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); |
1430ee0b MD |
295 | #ifdef DEBUG_YIELD |
296 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
297 | #endif | |
7685d963 | 298 | printf(" [-d delay] (writer period (us))"); |
daddf5b0 | 299 | printf(" [-c duration] (reader C.S. duration (in loops))"); |
4bad7d45 | 300 | printf(" [-v] (verbose output)"); |
9e97e478 | 301 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); |
1430ee0b MD |
302 | printf("\n"); |
303 | } | |
304 | ||
cf380c2f | 305 | int main(int argc, char **argv) |
ac260fd9 | 306 | { |
f69f195a | 307 | int err; |
8c86b9a1 | 308 | pthread_t *tid_reader, *tid_writer; |
f69f195a | 309 | void *tret; |
8c86b9a1 | 310 | unsigned long long *count_reader, *count_writer; |
1eec319e | 311 | unsigned long long tot_reads = 0, tot_writes = 0; |
9e97e478 | 312 | int i, a; |
f69f195a | 313 | |
8c86b9a1 MD |
314 | if (argc < 4) { |
315 | show_usage(argc, argv); | |
316 | return -1; | |
317 | } | |
318 | ||
319 | err = sscanf(argv[1], "%u", &nr_readers); | |
320 | if (err != 1) { | |
1430ee0b | 321 | show_usage(argc, argv); |
cf380c2f MD |
322 | return -1; |
323 | } | |
324 | ||
8c86b9a1 MD |
325 | err = sscanf(argv[2], "%u", &nr_writers); |
326 | if (err != 1) { | |
327 | show_usage(argc, argv); | |
328 | return -1; | |
329 | } | |
330 | ||
331 | err = sscanf(argv[3], "%lu", &duration); | |
cf380c2f | 332 | if (err != 1) { |
1430ee0b | 333 | show_usage(argc, argv); |
cf380c2f MD |
334 | return -1; |
335 | } | |
336 | ||
8c86b9a1 | 337 | for (i = 4; i < argc; i++) { |
cf380c2f MD |
338 | if (argv[i][0] != '-') |
339 | continue; | |
340 | switch (argv[i][1]) { | |
bb488185 | 341 | #ifdef DEBUG_YIELD |
cf380c2f MD |
342 | case 'r': |
343 | yield_active |= YIELD_READ; | |
344 | break; | |
345 | case 'w': | |
346 | yield_active |= YIELD_WRITE; | |
347 | break; | |
bb488185 | 348 | #endif |
9e97e478 MD |
349 | case 'a': |
350 | if (argc < i + 2) { | |
351 | show_usage(argc, argv); | |
352 | return -1; | |
353 | } | |
354 | a = atoi(argv[++i]); | |
2a7ac59d | 355 | cpu_affinities[next_aff++] = a; |
9e97e478 | 356 | use_affinity = 1; |
4bad7d45 | 357 | printf_verbose("Adding CPU %d affinity\n", a); |
9e97e478 | 358 | break; |
8b632bab MD |
359 | case 'c': |
360 | if (argc < i + 2) { | |
361 | show_usage(argc, argv); | |
362 | return -1; | |
363 | } | |
9e31d0f0 | 364 | rduration = atol(argv[++i]); |
8b632bab | 365 | break; |
8c86b9a1 | 366 | case 'd': |
7685d963 | 367 | if (argc < i + 2) { |
8c86b9a1 MD |
368 | show_usage(argc, argv); |
369 | return -1; | |
370 | } | |
9e31d0f0 | 371 | wdelay = atol(argv[++i]); |
bb488185 | 372 | break; |
4bad7d45 MD |
373 | case 'v': |
374 | verbose_mode = 1; | |
375 | break; | |
cf380c2f MD |
376 | } |
377 | } | |
cf380c2f | 378 | |
4bad7d45 | 379 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", |
8c86b9a1 | 380 | duration, nr_readers, nr_writers); |
9e31d0f0 | 381 | printf_verbose("Writer delay : %lu loops.\n", wdelay); |
4bad7d45 MD |
382 | printf_verbose("Reader duration : %lu loops.\n", rduration); |
383 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
87bd15cd BW |
384 | "main", pthread_self(), (unsigned long)gettid()); |
385 | ||
8c86b9a1 MD |
386 | test_array = malloc(sizeof(*test_array) * ARRAY_SIZE); |
387 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
388 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
389 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
390 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
391 | ||
2a7ac59d MD |
392 | next_aff = 0; |
393 | ||
8c86b9a1 | 394 | for (i = 0; i < nr_readers; i++) { |
1eec319e MD |
395 | err = pthread_create(&tid_reader[i], NULL, thr_reader, |
396 | &count_reader[i]); | |
f69f195a MD |
397 | if (err != 0) |
398 | exit(1); | |
399 | } | |
8c86b9a1 | 400 | for (i = 0; i < nr_writers; i++) { |
1eec319e MD |
401 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
402 | &count_writer[i]); | |
f69f195a MD |
403 | if (err != 0) |
404 | exit(1); | |
405 | } | |
406 | ||
7685d963 | 407 | smp_mb(); |
8c86b9a1 | 408 | |
78efb485 MD |
409 | test_go = 1; |
410 | ||
411 | sleep(duration); | |
412 | ||
413 | test_stop = 1; | |
414 | ||
8c86b9a1 | 415 | for (i = 0; i < nr_readers; i++) { |
f69f195a MD |
416 | err = pthread_join(tid_reader[i], &tret); |
417 | if (err != 0) | |
418 | exit(1); | |
1eec319e | 419 | tot_reads += count_reader[i]; |
f69f195a | 420 | } |
8c86b9a1 | 421 | for (i = 0; i < nr_writers; i++) { |
f69f195a MD |
422 | err = pthread_join(tid_writer[i], &tret); |
423 | if (err != 0) | |
424 | exit(1); | |
1eec319e | 425 | tot_writes += count_writer[i]; |
f69f195a | 426 | } |
5873cd17 | 427 | |
4bad7d45 | 428 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, |
1eec319e | 429 | tot_writes); |
6a190115 | 430 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " |
cda3c71d | 431 | "nr_writers %3u " |
9e31d0f0 | 432 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", |
4bad7d45 MD |
433 | argv[0], duration, nr_readers, rduration, |
434 | nr_writers, wdelay, tot_reads, tot_writes, | |
435 | tot_reads + tot_writes); | |
bb488185 | 436 | test_array_free(test_rcu_pointer); |
8c86b9a1 MD |
437 | free(test_array); |
438 | free(tid_reader); | |
439 | free(tid_writer); | |
440 | free(count_reader); | |
441 | free(count_writer); | |
f69f195a | 442 | return 0; |
ac260fd9 | 443 | } |