Commit | Line | Data |
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90075a50 | 1 | /* |
786ee85b | 2 | * test_urcu_defer.c |
90075a50 MD |
3 | * |
4 | * Userspace RCU library - test program (with automatic reclamation) | |
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 | ||
23 | #define _GNU_SOURCE | |
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> | |
34 | #include <sched.h> | |
94b343fd | 35 | #include <errno.h> |
90075a50 | 36 | |
ec4e58a3 | 37 | #include <urcu/arch.h> |
90075a50 | 38 | |
90075a50 MD |
39 | /* hardcoded number of CPUs */ |
40 | #define NR_CPUS 16384 | |
41 | ||
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 | ||
57 | #ifndef DYNAMIC_LINK_TEST | |
58 | #define _LGPL_SOURCE | |
59 | #else | |
60 | #define debug_yield_read() | |
61 | #endif | |
ec4e58a3 MD |
62 | #include <urcu.h> |
63 | #include <urcu-defer.h> | |
90075a50 MD |
64 | |
65 | struct test_array { | |
66 | int a; | |
67 | }; | |
68 | ||
69 | static volatile int test_go, test_stop; | |
70 | ||
71 | static unsigned long wdelay; | |
72 | ||
73 | static struct test_array *test_rcu_pointer; | |
74 | ||
75 | static unsigned long duration; | |
76 | ||
77 | /* read-side C.S. duration, in loops */ | |
78 | static unsigned long rduration; | |
79 | ||
80 | static inline void loop_sleep(unsigned long l) | |
81 | { | |
82 | while(l-- != 0) | |
83 | cpu_relax(); | |
84 | } | |
85 | ||
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 | ||
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 | ||
100 | static void set_affinity(void) | |
101 | { | |
102 | cpu_set_t mask; | |
103 | int cpu; | |
104 | int ret; | |
105 | ||
106 | if (!use_affinity) | |
107 | return; | |
108 | ||
109 | ret = pthread_mutex_lock(&affinity_mutex); | |
110 | if (ret) { | |
111 | perror("Error in pthread mutex lock"); | |
112 | exit(-1); | |
113 | } | |
114 | cpu = cpu_affinities[next_aff++]; | |
115 | ret = pthread_mutex_unlock(&affinity_mutex); | |
116 | if (ret) { | |
117 | perror("Error in pthread mutex unlock"); | |
118 | exit(-1); | |
119 | } | |
120 | CPU_ZERO(&mask); | |
121 | CPU_SET(cpu, &mask); | |
122 | sched_setaffinity(0, sizeof(mask), &mask); | |
123 | } | |
124 | ||
125 | /* | |
126 | * returns 0 if test should end. | |
127 | */ | |
128 | static int test_duration_write(void) | |
129 | { | |
130 | return !test_stop; | |
131 | } | |
132 | ||
133 | static int test_duration_read(void) | |
134 | { | |
135 | return !test_stop; | |
136 | } | |
137 | ||
138 | static unsigned long long __thread nr_writes; | |
139 | static unsigned long long __thread nr_reads; | |
140 | ||
141 | static | |
142 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes; | |
143 | ||
144 | static unsigned int nr_readers; | |
145 | static unsigned int nr_writers; | |
146 | ||
147 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
148 | ||
149 | void rcu_copy_mutex_lock(void) | |
150 | { | |
151 | int ret; | |
152 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
153 | if (ret) { | |
154 | perror("Error in pthread mutex lock"); | |
155 | exit(-1); | |
156 | } | |
157 | } | |
158 | ||
159 | void rcu_copy_mutex_unlock(void) | |
160 | { | |
161 | int ret; | |
162 | ||
163 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
164 | if (ret) { | |
165 | perror("Error in pthread mutex unlock"); | |
166 | exit(-1); | |
167 | } | |
168 | } | |
169 | ||
170 | void *thr_reader(void *_count) | |
171 | { | |
172 | unsigned long long *count = _count; | |
173 | struct test_array *local_ptr; | |
174 | ||
175 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
176 | "reader", pthread_self(), (unsigned long)gettid()); | |
177 | ||
178 | set_affinity(); | |
179 | ||
180 | rcu_register_thread(); | |
181 | ||
182 | while (!test_go) | |
183 | { | |
184 | } | |
185 | smp_mb(); | |
186 | ||
187 | for (;;) { | |
188 | rcu_read_lock(); | |
189 | local_ptr = rcu_dereference(test_rcu_pointer); | |
190 | debug_yield_read(); | |
191 | if (local_ptr) | |
192 | assert(local_ptr->a == 8); | |
193 | if (unlikely(rduration)) | |
194 | loop_sleep(rduration); | |
195 | rcu_read_unlock(); | |
196 | nr_reads++; | |
197 | if (unlikely(!test_duration_read())) | |
198 | break; | |
199 | } | |
200 | ||
201 | rcu_unregister_thread(); | |
202 | ||
203 | *count = nr_reads; | |
204 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
205 | "reader", pthread_self(), (unsigned long)gettid()); | |
206 | return ((void*)1); | |
207 | ||
208 | } | |
209 | ||
804b4375 MD |
210 | static void test_cb2(void *data) |
211 | { | |
212 | } | |
213 | ||
214 | static void test_cb1(void *data) | |
215 | { | |
216 | } | |
217 | ||
90075a50 MD |
218 | void *thr_writer(void *data) |
219 | { | |
220 | unsigned long wtidx = (unsigned long)data; | |
221 | struct test_array *new, *old = NULL; | |
222 | ||
223 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
224 | "writer", pthread_self(), (unsigned long)gettid()); | |
225 | ||
226 | set_affinity(); | |
227 | ||
786ee85b | 228 | rcu_defer_register_thread(); |
90075a50 MD |
229 | |
230 | while (!test_go) | |
231 | { | |
232 | } | |
233 | smp_mb(); | |
234 | ||
235 | for (;;) { | |
236 | new = malloc(sizeof(*new)); | |
237 | new->a = 8; | |
238 | old = rcu_xchg_pointer(&test_rcu_pointer, new); | |
804b4375 | 239 | call_rcu(free, old); |
804b4375 MD |
240 | call_rcu(test_cb1, old); |
241 | call_rcu(test_cb1, (void *)-2L); | |
242 | call_rcu(test_cb1, (void *)-2L); | |
243 | call_rcu(test_cb1, old); | |
244 | call_rcu(test_cb2, (void *)-2L); | |
804b4375 | 245 | call_rcu(test_cb2, (void *)-4L); |
48f9433c | 246 | call_rcu(test_cb2, (void *)-2L); |
90075a50 MD |
247 | nr_writes++; |
248 | if (unlikely(!test_duration_write())) | |
249 | break; | |
250 | if (unlikely(wdelay)) | |
251 | loop_sleep(wdelay); | |
252 | } | |
253 | ||
786ee85b | 254 | rcu_defer_unregister_thread(); |
90075a50 MD |
255 | |
256 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
257 | "writer", pthread_self(), (unsigned long)gettid()); | |
258 | tot_nr_writes[wtidx] = nr_writes; | |
259 | return ((void*)2); | |
260 | } | |
261 | ||
262 | void show_usage(int argc, char **argv) | |
263 | { | |
264 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
265 | #ifdef DEBUG_YIELD | |
266 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
267 | #endif | |
268 | printf(" [-d delay] (writer period (us))"); | |
269 | printf(" [-c duration] (reader C.S. duration (in loops))"); | |
270 | printf(" [-v] (verbose output)"); | |
271 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); | |
272 | printf("\n"); | |
273 | } | |
274 | ||
275 | int main(int argc, char **argv) | |
276 | { | |
277 | int err; | |
278 | pthread_t *tid_reader, *tid_writer; | |
279 | void *tret; | |
280 | unsigned long long *count_reader; | |
281 | unsigned long long tot_reads = 0, tot_writes = 0; | |
282 | int i, a; | |
283 | ||
284 | if (argc < 4) { | |
285 | show_usage(argc, argv); | |
286 | return -1; | |
287 | } | |
288 | ||
289 | err = sscanf(argv[1], "%u", &nr_readers); | |
290 | if (err != 1) { | |
291 | show_usage(argc, argv); | |
292 | return -1; | |
293 | } | |
294 | ||
295 | err = sscanf(argv[2], "%u", &nr_writers); | |
296 | if (err != 1) { | |
297 | show_usage(argc, argv); | |
298 | return -1; | |
299 | } | |
300 | ||
301 | err = sscanf(argv[3], "%lu", &duration); | |
302 | if (err != 1) { | |
303 | show_usage(argc, argv); | |
304 | return -1; | |
305 | } | |
306 | ||
307 | for (i = 4; i < argc; i++) { | |
308 | if (argv[i][0] != '-') | |
309 | continue; | |
310 | switch (argv[i][1]) { | |
311 | #ifdef DEBUG_YIELD | |
312 | case 'r': | |
313 | yield_active |= YIELD_READ; | |
314 | break; | |
315 | case 'w': | |
316 | yield_active |= YIELD_WRITE; | |
317 | break; | |
318 | #endif | |
319 | case 'a': | |
320 | if (argc < i + 2) { | |
321 | show_usage(argc, argv); | |
322 | return -1; | |
323 | } | |
324 | a = atoi(argv[++i]); | |
325 | cpu_affinities[next_aff++] = a; | |
326 | use_affinity = 1; | |
327 | printf_verbose("Adding CPU %d affinity\n", a); | |
328 | break; | |
329 | case 'c': | |
330 | if (argc < i + 2) { | |
331 | show_usage(argc, argv); | |
332 | return -1; | |
333 | } | |
334 | rduration = atol(argv[++i]); | |
335 | break; | |
336 | case 'd': | |
337 | if (argc < i + 2) { | |
338 | show_usage(argc, argv); | |
339 | return -1; | |
340 | } | |
341 | wdelay = atol(argv[++i]); | |
342 | break; | |
343 | case 'v': | |
344 | verbose_mode = 1; | |
345 | break; | |
346 | } | |
347 | } | |
348 | ||
349 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", | |
350 | duration, nr_readers, nr_writers); | |
351 | printf_verbose("Writer delay : %lu loops.\n", wdelay); | |
352 | printf_verbose("Reader duration : %lu loops.\n", rduration); | |
353 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
354 | "main", pthread_self(), (unsigned long)gettid()); | |
355 | ||
356 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
357 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
358 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
359 | tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers); | |
360 | ||
361 | next_aff = 0; | |
362 | ||
363 | for (i = 0; i < nr_readers; i++) { | |
364 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
365 | &count_reader[i]); | |
366 | if (err != 0) | |
367 | exit(1); | |
368 | } | |
369 | for (i = 0; i < nr_writers; i++) { | |
370 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
371 | (void *)(long)i); | |
372 | if (err != 0) | |
373 | exit(1); | |
374 | } | |
375 | ||
376 | smp_mb(); | |
377 | ||
378 | test_go = 1; | |
379 | ||
380 | sleep(duration); | |
381 | ||
382 | test_stop = 1; | |
383 | ||
384 | for (i = 0; i < nr_readers; i++) { | |
385 | err = pthread_join(tid_reader[i], &tret); | |
386 | if (err != 0) | |
387 | exit(1); | |
388 | tot_reads += count_reader[i]; | |
389 | } | |
390 | for (i = 0; i < nr_writers; i++) { | |
391 | err = pthread_join(tid_writer[i], &tret); | |
392 | if (err != 0) | |
393 | exit(1); | |
394 | tot_writes += tot_nr_writes[i]; | |
395 | } | |
396 | ||
397 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, | |
398 | tot_writes); | |
399 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " | |
400 | "nr_writers %3u " | |
401 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", | |
402 | argv[0], duration, nr_readers, rduration, | |
403 | nr_writers, wdelay, tot_reads, tot_writes, | |
404 | tot_reads + tot_writes); | |
405 | free(tid_reader); | |
406 | free(tid_writer); | |
407 | free(count_reader); | |
408 | free(tot_nr_writes); | |
409 | ||
410 | return 0; | |
411 | } |