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 | |
d8540fc5 | 24 | #include "../config.h" |
90075a50 MD |
25 | #include <stdio.h> |
26 | #include <pthread.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/types.h> | |
30 | #include <sys/wait.h> | |
31 | #include <unistd.h> | |
32 | #include <stdio.h> | |
33 | #include <assert.h> | |
34 | #include <sys/syscall.h> | |
35 | #include <sched.h> | |
94b343fd | 36 | #include <errno.h> |
90075a50 | 37 | |
ec4e58a3 | 38 | #include <urcu/arch.h> |
90075a50 | 39 | |
90075a50 MD |
40 | /* hardcoded number of CPUs */ |
41 | #define NR_CPUS 16384 | |
42 | ||
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 | ||
58 | #ifndef DYNAMIC_LINK_TEST | |
59 | #define _LGPL_SOURCE | |
60 | #else | |
61 | #define debug_yield_read() | |
62 | #endif | |
ec4e58a3 MD |
63 | #include <urcu.h> |
64 | #include <urcu-defer.h> | |
90075a50 MD |
65 | |
66 | struct test_array { | |
67 | int a; | |
68 | }; | |
69 | ||
70 | static volatile int test_go, test_stop; | |
71 | ||
72 | static unsigned long wdelay; | |
73 | ||
74 | static struct test_array *test_rcu_pointer; | |
75 | ||
76 | static unsigned long duration; | |
77 | ||
78 | /* read-side C.S. duration, in loops */ | |
79 | static unsigned long rduration; | |
80 | ||
81 | static inline void loop_sleep(unsigned long l) | |
82 | { | |
83 | while(l-- != 0) | |
84 | cpu_relax(); | |
85 | } | |
86 | ||
87 | static int verbose_mode; | |
88 | ||
89 | #define printf_verbose(fmt, args...) \ | |
90 | do { \ | |
91 | if (verbose_mode) \ | |
92 | printf(fmt, args); \ | |
93 | } while (0) | |
94 | ||
95 | static unsigned int cpu_affinities[NR_CPUS]; | |
96 | static unsigned int next_aff = 0; | |
97 | static int use_affinity = 0; | |
98 | ||
99 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; | |
100 | ||
d8540fc5 PA |
101 | #ifndef HAVE_CPU_SET_T |
102 | typedef unsigned long cpu_set_t; | |
103 | # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0) | |
104 | # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0) | |
105 | #endif | |
106 | ||
90075a50 MD |
107 | static void set_affinity(void) |
108 | { | |
109 | cpu_set_t mask; | |
110 | int cpu; | |
111 | int ret; | |
112 | ||
113 | if (!use_affinity) | |
114 | return; | |
115 | ||
d8540fc5 | 116 | #if HAVE_SCHED_SETAFFINITY |
90075a50 MD |
117 | ret = pthread_mutex_lock(&affinity_mutex); |
118 | if (ret) { | |
119 | perror("Error in pthread mutex lock"); | |
120 | exit(-1); | |
121 | } | |
122 | cpu = cpu_affinities[next_aff++]; | |
123 | ret = pthread_mutex_unlock(&affinity_mutex); | |
124 | if (ret) { | |
125 | perror("Error in pthread mutex unlock"); | |
126 | exit(-1); | |
127 | } | |
d8540fc5 | 128 | |
90075a50 MD |
129 | CPU_ZERO(&mask); |
130 | CPU_SET(cpu, &mask); | |
d8540fc5 PA |
131 | #if SCHED_SETAFFINITY_ARGS == 2 |
132 | sched_setaffinity(0, &mask); | |
133 | #else | |
90075a50 | 134 | sched_setaffinity(0, sizeof(mask), &mask); |
d8540fc5 PA |
135 | #endif |
136 | #endif /* HAVE_SCHED_SETAFFINITY */ | |
90075a50 MD |
137 | } |
138 | ||
139 | /* | |
140 | * returns 0 if test should end. | |
141 | */ | |
142 | static int test_duration_write(void) | |
143 | { | |
144 | return !test_stop; | |
145 | } | |
146 | ||
147 | static int test_duration_read(void) | |
148 | { | |
149 | return !test_stop; | |
150 | } | |
151 | ||
152 | static unsigned long long __thread nr_writes; | |
153 | static unsigned long long __thread nr_reads; | |
154 | ||
155 | static | |
156 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes; | |
157 | ||
158 | static unsigned int nr_readers; | |
159 | static unsigned int nr_writers; | |
160 | ||
161 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
162 | ||
163 | void rcu_copy_mutex_lock(void) | |
164 | { | |
165 | int ret; | |
166 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
167 | if (ret) { | |
168 | perror("Error in pthread mutex lock"); | |
169 | exit(-1); | |
170 | } | |
171 | } | |
172 | ||
173 | void rcu_copy_mutex_unlock(void) | |
174 | { | |
175 | int ret; | |
176 | ||
177 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
178 | if (ret) { | |
179 | perror("Error in pthread mutex unlock"); | |
180 | exit(-1); | |
181 | } | |
182 | } | |
183 | ||
184 | void *thr_reader(void *_count) | |
185 | { | |
186 | unsigned long long *count = _count; | |
187 | struct test_array *local_ptr; | |
188 | ||
189 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
190 | "reader", pthread_self(), (unsigned long)gettid()); | |
191 | ||
192 | set_affinity(); | |
193 | ||
194 | rcu_register_thread(); | |
195 | ||
196 | while (!test_go) | |
197 | { | |
198 | } | |
199 | smp_mb(); | |
200 | ||
201 | for (;;) { | |
202 | rcu_read_lock(); | |
203 | local_ptr = rcu_dereference(test_rcu_pointer); | |
204 | debug_yield_read(); | |
205 | if (local_ptr) | |
206 | assert(local_ptr->a == 8); | |
207 | if (unlikely(rduration)) | |
208 | loop_sleep(rduration); | |
209 | rcu_read_unlock(); | |
210 | nr_reads++; | |
211 | if (unlikely(!test_duration_read())) | |
212 | break; | |
213 | } | |
214 | ||
215 | rcu_unregister_thread(); | |
216 | ||
217 | *count = nr_reads; | |
218 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
219 | "reader", pthread_self(), (unsigned long)gettid()); | |
220 | return ((void*)1); | |
221 | ||
222 | } | |
223 | ||
804b4375 MD |
224 | static void test_cb2(void *data) |
225 | { | |
226 | } | |
227 | ||
228 | static void test_cb1(void *data) | |
229 | { | |
230 | } | |
231 | ||
90075a50 MD |
232 | void *thr_writer(void *data) |
233 | { | |
234 | unsigned long wtidx = (unsigned long)data; | |
235 | struct test_array *new, *old = NULL; | |
236 | ||
237 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
238 | "writer", pthread_self(), (unsigned long)gettid()); | |
239 | ||
240 | set_affinity(); | |
241 | ||
786ee85b | 242 | rcu_defer_register_thread(); |
90075a50 MD |
243 | |
244 | while (!test_go) | |
245 | { | |
246 | } | |
247 | smp_mb(); | |
248 | ||
249 | for (;;) { | |
250 | new = malloc(sizeof(*new)); | |
251 | new->a = 8; | |
252 | old = rcu_xchg_pointer(&test_rcu_pointer, new); | |
b4f313b7 MD |
253 | defer_rcu(free, old); |
254 | defer_rcu(test_cb1, old); | |
255 | defer_rcu(test_cb1, (void *)-2L); | |
256 | defer_rcu(test_cb1, (void *)-2L); | |
257 | defer_rcu(test_cb1, old); | |
258 | defer_rcu(test_cb2, (void *)-2L); | |
259 | defer_rcu(test_cb2, (void *)-4L); | |
260 | defer_rcu(test_cb2, (void *)-2L); | |
90075a50 MD |
261 | nr_writes++; |
262 | if (unlikely(!test_duration_write())) | |
263 | break; | |
264 | if (unlikely(wdelay)) | |
265 | loop_sleep(wdelay); | |
266 | } | |
267 | ||
786ee85b | 268 | rcu_defer_unregister_thread(); |
90075a50 MD |
269 | |
270 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
271 | "writer", pthread_self(), (unsigned long)gettid()); | |
272 | tot_nr_writes[wtidx] = nr_writes; | |
273 | return ((void*)2); | |
274 | } | |
275 | ||
276 | void show_usage(int argc, char **argv) | |
277 | { | |
278 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
279 | #ifdef DEBUG_YIELD | |
280 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
281 | #endif | |
282 | printf(" [-d delay] (writer period (us))"); | |
283 | printf(" [-c duration] (reader C.S. duration (in loops))"); | |
284 | printf(" [-v] (verbose output)"); | |
285 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); | |
286 | printf("\n"); | |
287 | } | |
288 | ||
289 | int main(int argc, char **argv) | |
290 | { | |
291 | int err; | |
292 | pthread_t *tid_reader, *tid_writer; | |
293 | void *tret; | |
294 | unsigned long long *count_reader; | |
295 | unsigned long long tot_reads = 0, tot_writes = 0; | |
296 | int i, a; | |
297 | ||
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) { | |
305 | show_usage(argc, argv); | |
306 | return -1; | |
307 | } | |
308 | ||
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); | |
316 | if (err != 1) { | |
317 | show_usage(argc, argv); | |
318 | return -1; | |
319 | } | |
320 | ||
321 | for (i = 4; i < argc; i++) { | |
322 | if (argv[i][0] != '-') | |
323 | continue; | |
324 | switch (argv[i][1]) { | |
325 | #ifdef DEBUG_YIELD | |
326 | case 'r': | |
327 | yield_active |= YIELD_READ; | |
328 | break; | |
329 | case 'w': | |
330 | yield_active |= YIELD_WRITE; | |
331 | break; | |
332 | #endif | |
333 | case 'a': | |
334 | if (argc < i + 2) { | |
335 | show_usage(argc, argv); | |
336 | return -1; | |
337 | } | |
338 | a = atoi(argv[++i]); | |
339 | cpu_affinities[next_aff++] = a; | |
340 | use_affinity = 1; | |
341 | printf_verbose("Adding CPU %d affinity\n", a); | |
342 | break; | |
343 | case 'c': | |
344 | if (argc < i + 2) { | |
345 | show_usage(argc, argv); | |
346 | return -1; | |
347 | } | |
348 | rduration = atol(argv[++i]); | |
349 | break; | |
350 | case 'd': | |
351 | if (argc < i + 2) { | |
352 | show_usage(argc, argv); | |
353 | return -1; | |
354 | } | |
355 | wdelay = atol(argv[++i]); | |
356 | break; | |
357 | case 'v': | |
358 | verbose_mode = 1; | |
359 | break; | |
360 | } | |
361 | } | |
362 | ||
363 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", | |
364 | duration, nr_readers, nr_writers); | |
365 | printf_verbose("Writer delay : %lu loops.\n", wdelay); | |
366 | printf_verbose("Reader duration : %lu loops.\n", rduration); | |
367 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
368 | "main", pthread_self(), (unsigned long)gettid()); | |
369 | ||
370 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
371 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
372 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
373 | tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers); | |
374 | ||
375 | next_aff = 0; | |
376 | ||
377 | for (i = 0; i < nr_readers; i++) { | |
378 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
379 | &count_reader[i]); | |
380 | if (err != 0) | |
381 | exit(1); | |
382 | } | |
383 | for (i = 0; i < nr_writers; i++) { | |
384 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
385 | (void *)(long)i); | |
386 | if (err != 0) | |
387 | exit(1); | |
388 | } | |
389 | ||
390 | smp_mb(); | |
391 | ||
392 | test_go = 1; | |
393 | ||
394 | sleep(duration); | |
395 | ||
396 | test_stop = 1; | |
397 | ||
398 | for (i = 0; i < nr_readers; i++) { | |
399 | err = pthread_join(tid_reader[i], &tret); | |
400 | if (err != 0) | |
401 | exit(1); | |
402 | tot_reads += count_reader[i]; | |
403 | } | |
404 | for (i = 0; i < nr_writers; i++) { | |
405 | err = pthread_join(tid_writer[i], &tret); | |
406 | if (err != 0) | |
407 | exit(1); | |
408 | tot_writes += tot_nr_writes[i]; | |
409 | } | |
410 | ||
411 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, | |
412 | tot_writes); | |
413 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " | |
414 | "nr_writers %3u " | |
415 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", | |
416 | argv[0], duration, nr_readers, rduration, | |
417 | nr_writers, wdelay, tot_reads, tot_writes, | |
418 | tot_reads + tot_writes); | |
419 | free(tid_reader); | |
420 | free(tid_writer); | |
421 | free(count_reader); | |
422 | free(tot_nr_writes); | |
423 | ||
424 | return 0; | |
425 | } |