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