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a813abf8 MD |
1 | /* |
2 | * test_urcu_gc.c | |
3 | * | |
4 | * Userspace RCU library - test program (with baatch 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" |
a813abf8 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> |
a813abf8 | 37 | |
ec4e58a3 | 38 | #include <urcu/arch.h> |
a813abf8 | 39 | |
2a7ac59d MD |
40 | /* hardcoded number of CPUs */ |
41 | #define NR_CPUS 16384 | |
42 | ||
a813abf8 MD |
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 | 63 | #include <urcu.h> |
a813abf8 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 | ||
4a3e0004 | 75 | static unsigned int reclaim_batch = 1; |
a813abf8 MD |
76 | |
77 | struct reclaim_queue { | |
78 | void **queue; /* Beginning of queue */ | |
79 | void **head; /* Insert position */ | |
80 | }; | |
81 | ||
82 | static struct reclaim_queue *pending_reclaims; | |
83 | ||
84 | static unsigned long duration; | |
85 | ||
86 | /* read-side C.S. duration, in loops */ | |
87 | static unsigned long rduration; | |
88 | ||
89 | static inline void loop_sleep(unsigned long l) | |
90 | { | |
91 | while(l-- != 0) | |
92 | cpu_relax(); | |
93 | } | |
94 | ||
95 | static int verbose_mode; | |
96 | ||
97 | #define printf_verbose(fmt, args...) \ | |
98 | do { \ | |
99 | if (verbose_mode) \ | |
100 | printf(fmt, args); \ | |
101 | } while (0) | |
102 | ||
2a7ac59d MD |
103 | static unsigned int cpu_affinities[NR_CPUS]; |
104 | static unsigned int next_aff = 0; | |
105 | static int use_affinity = 0; | |
106 | ||
6af882ba MD |
107 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; |
108 | ||
d8540fc5 PA |
109 | #ifndef HAVE_CPU_SET_T |
110 | typedef unsigned long cpu_set_t; | |
111 | # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0) | |
112 | # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0) | |
113 | #endif | |
114 | ||
2a7ac59d MD |
115 | static void set_affinity(void) |
116 | { | |
117 | cpu_set_t mask; | |
118 | int cpu; | |
6af882ba | 119 | int ret; |
2a7ac59d MD |
120 | |
121 | if (!use_affinity) | |
122 | return; | |
123 | ||
d8540fc5 | 124 | #if HAVE_SCHED_SETAFFINITY |
6af882ba MD |
125 | ret = pthread_mutex_lock(&affinity_mutex); |
126 | if (ret) { | |
127 | perror("Error in pthread mutex lock"); | |
128 | exit(-1); | |
129 | } | |
2a7ac59d | 130 | cpu = cpu_affinities[next_aff++]; |
6af882ba MD |
131 | ret = pthread_mutex_unlock(&affinity_mutex); |
132 | if (ret) { | |
133 | perror("Error in pthread mutex unlock"); | |
134 | exit(-1); | |
135 | } | |
d8540fc5 | 136 | |
2a7ac59d MD |
137 | CPU_ZERO(&mask); |
138 | CPU_SET(cpu, &mask); | |
d8540fc5 PA |
139 | #if SCHED_SETAFFINITY_ARGS == 2 |
140 | sched_setaffinity(0, &mask); | |
141 | #else | |
2a7ac59d | 142 | sched_setaffinity(0, sizeof(mask), &mask); |
d8540fc5 PA |
143 | #endif |
144 | #endif /* HAVE_SCHED_SETAFFINITY */ | |
2a7ac59d MD |
145 | } |
146 | ||
a813abf8 MD |
147 | /* |
148 | * returns 0 if test should end. | |
149 | */ | |
150 | static int test_duration_write(void) | |
151 | { | |
152 | return !test_stop; | |
153 | } | |
154 | ||
155 | static int test_duration_read(void) | |
156 | { | |
157 | return !test_stop; | |
158 | } | |
159 | ||
160 | static unsigned long long __thread nr_writes; | |
161 | static unsigned long long __thread nr_reads; | |
162 | ||
163 | static | |
164 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes; | |
165 | ||
166 | static unsigned int nr_readers; | |
167 | static unsigned int nr_writers; | |
168 | ||
169 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
170 | ||
171 | void rcu_copy_mutex_lock(void) | |
172 | { | |
173 | int ret; | |
174 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
175 | if (ret) { | |
176 | perror("Error in pthread mutex lock"); | |
177 | exit(-1); | |
178 | } | |
179 | } | |
180 | ||
181 | void rcu_copy_mutex_unlock(void) | |
182 | { | |
183 | int ret; | |
184 | ||
185 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
186 | if (ret) { | |
187 | perror("Error in pthread mutex unlock"); | |
188 | exit(-1); | |
189 | } | |
190 | } | |
191 | ||
192 | void *thr_reader(void *_count) | |
193 | { | |
194 | unsigned long long *count = _count; | |
195 | struct test_array *local_ptr; | |
196 | ||
197 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
198 | "reader", pthread_self(), (unsigned long)gettid()); | |
199 | ||
2a7ac59d MD |
200 | set_affinity(); |
201 | ||
a813abf8 MD |
202 | rcu_register_thread(); |
203 | ||
204 | while (!test_go) | |
205 | { | |
206 | } | |
207 | smp_mb(); | |
208 | ||
209 | for (;;) { | |
210 | rcu_read_lock(); | |
211 | local_ptr = rcu_dereference(test_rcu_pointer); | |
212 | debug_yield_read(); | |
213 | if (local_ptr) | |
214 | assert(local_ptr->a == 8); | |
215 | if (unlikely(rduration)) | |
216 | loop_sleep(rduration); | |
217 | rcu_read_unlock(); | |
218 | nr_reads++; | |
219 | if (unlikely(!test_duration_read())) | |
220 | break; | |
221 | } | |
222 | ||
223 | rcu_unregister_thread(); | |
224 | ||
225 | *count = nr_reads; | |
226 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
227 | "reader", pthread_self(), (unsigned long)gettid()); | |
228 | return ((void*)1); | |
229 | ||
230 | } | |
231 | ||
53091fe5 | 232 | static void rcu_gc_clear_queue(unsigned long wtidx) |
a813abf8 MD |
233 | { |
234 | void **p; | |
235 | ||
53091fe5 | 236 | /* Wait for Q.S and empty queue */ |
a813abf8 MD |
237 | synchronize_rcu(); |
238 | ||
239 | for (p = pending_reclaims[wtidx].queue; | |
240 | p < pending_reclaims[wtidx].head; p++) { | |
241 | /* poison */ | |
242 | if (*p) | |
243 | ((struct test_array *)*p)->a = 0; | |
244 | free(*p); | |
245 | } | |
246 | pending_reclaims[wtidx].head = pending_reclaims[wtidx].queue; | |
247 | } | |
248 | ||
53091fe5 MD |
249 | /* Using per-thread queue */ |
250 | static void rcu_gc_reclaim(unsigned long wtidx, void *old) | |
a813abf8 | 251 | { |
53091fe5 MD |
252 | /* Queue pointer */ |
253 | *pending_reclaims[wtidx].head = old; | |
254 | pending_reclaims[wtidx].head++; | |
a813abf8 | 255 | |
53091fe5 MD |
256 | if (likely(pending_reclaims[wtidx].head - pending_reclaims[wtidx].queue |
257 | < reclaim_batch)) | |
258 | return; | |
a813abf8 | 259 | |
53091fe5 | 260 | rcu_gc_clear_queue(wtidx); |
a813abf8 MD |
261 | } |
262 | ||
263 | void *thr_writer(void *data) | |
264 | { | |
265 | unsigned long wtidx = (unsigned long)data; | |
321e29d9 MD |
266 | #ifdef TEST_LOCAL_GC |
267 | struct test_array *old = NULL; | |
268 | #else | |
a813abf8 | 269 | struct test_array *new, *old; |
321e29d9 | 270 | #endif |
a813abf8 MD |
271 | |
272 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
273 | "writer", pthread_self(), (unsigned long)gettid()); | |
274 | ||
2a7ac59d MD |
275 | set_affinity(); |
276 | ||
a813abf8 MD |
277 | while (!test_go) |
278 | { | |
279 | } | |
280 | smp_mb(); | |
281 | ||
282 | for (;;) { | |
321e29d9 | 283 | #ifndef TEST_LOCAL_GC |
a813abf8 | 284 | new = malloc(sizeof(*new)); |
a813abf8 MD |
285 | new->a = 8; |
286 | old = rcu_xchg_pointer(&test_rcu_pointer, new); | |
321e29d9 | 287 | #endif |
a813abf8 MD |
288 | rcu_gc_reclaim(wtidx, old); |
289 | nr_writes++; | |
290 | if (unlikely(!test_duration_write())) | |
291 | break; | |
292 | if (unlikely(wdelay)) | |
293 | loop_sleep(wdelay); | |
294 | } | |
295 | ||
296 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
297 | "writer", pthread_self(), (unsigned long)gettid()); | |
298 | tot_nr_writes[wtidx] = nr_writes; | |
299 | return ((void*)2); | |
300 | } | |
301 | ||
302 | void show_usage(int argc, char **argv) | |
303 | { | |
304 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
305 | #ifdef DEBUG_YIELD | |
306 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
307 | #endif | |
308 | printf(" [-d delay] (writer period (us))"); | |
309 | printf(" [-c duration] (reader C.S. duration (in loops))"); | |
310 | printf(" [-v] (verbose output)"); | |
311 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); | |
312 | printf("\n"); | |
313 | } | |
314 | ||
a813abf8 MD |
315 | int main(int argc, char **argv) |
316 | { | |
317 | int err; | |
318 | pthread_t *tid_reader, *tid_writer; | |
319 | void *tret; | |
320 | unsigned long long *count_reader; | |
321 | unsigned long long tot_reads = 0, tot_writes = 0; | |
322 | int i, a; | |
a813abf8 MD |
323 | |
324 | if (argc < 4) { | |
325 | show_usage(argc, argv); | |
326 | return -1; | |
327 | } | |
328 | ||
329 | err = sscanf(argv[1], "%u", &nr_readers); | |
330 | if (err != 1) { | |
331 | show_usage(argc, argv); | |
332 | return -1; | |
333 | } | |
334 | ||
335 | err = sscanf(argv[2], "%u", &nr_writers); | |
336 | if (err != 1) { | |
337 | show_usage(argc, argv); | |
338 | return -1; | |
339 | } | |
340 | ||
341 | err = sscanf(argv[3], "%lu", &duration); | |
342 | if (err != 1) { | |
343 | show_usage(argc, argv); | |
344 | return -1; | |
345 | } | |
346 | ||
a813abf8 MD |
347 | for (i = 4; i < argc; i++) { |
348 | if (argv[i][0] != '-') | |
349 | continue; | |
350 | switch (argv[i][1]) { | |
351 | #ifdef DEBUG_YIELD | |
352 | case 'r': | |
353 | yield_active |= YIELD_READ; | |
354 | break; | |
355 | case 'w': | |
356 | yield_active |= YIELD_WRITE; | |
357 | break; | |
358 | #endif | |
359 | case 'a': | |
360 | if (argc < i + 2) { | |
361 | show_usage(argc, argv); | |
362 | return -1; | |
363 | } | |
364 | a = atoi(argv[++i]); | |
2a7ac59d | 365 | cpu_affinities[next_aff++] = a; |
a813abf8 MD |
366 | use_affinity = 1; |
367 | printf_verbose("Adding CPU %d affinity\n", a); | |
368 | break; | |
369 | case 'b': | |
370 | if (argc < i + 2) { | |
371 | show_usage(argc, argv); | |
372 | return -1; | |
373 | } | |
374 | reclaim_batch = atol(argv[++i]); | |
375 | break; | |
376 | case 'c': | |
377 | if (argc < i + 2) { | |
378 | show_usage(argc, argv); | |
379 | return -1; | |
380 | } | |
381 | rduration = atol(argv[++i]); | |
382 | break; | |
383 | case 'd': | |
384 | if (argc < i + 2) { | |
385 | show_usage(argc, argv); | |
386 | return -1; | |
387 | } | |
388 | wdelay = atol(argv[++i]); | |
389 | break; | |
390 | case 'v': | |
391 | verbose_mode = 1; | |
392 | break; | |
393 | } | |
394 | } | |
395 | ||
396 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", | |
397 | duration, nr_readers, nr_writers); | |
398 | printf_verbose("Writer delay : %lu loops.\n", wdelay); | |
399 | printf_verbose("Reader duration : %lu loops.\n", rduration); | |
400 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
401 | "main", pthread_self(), (unsigned long)gettid()); | |
402 | ||
a813abf8 MD |
403 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); |
404 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
405 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
406 | tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers); | |
407 | pending_reclaims = malloc(sizeof(*pending_reclaims) * nr_writers); | |
408 | if (reclaim_batch * sizeof(*pending_reclaims[i].queue) | |
409 | < CACHE_LINE_SIZE) | |
410 | for (i = 0; i < nr_writers; i++) | |
411 | pending_reclaims[i].queue = calloc(1, CACHE_LINE_SIZE); | |
412 | else | |
413 | for (i = 0; i < nr_writers; i++) | |
414 | pending_reclaims[i].queue = calloc(reclaim_batch, | |
415 | sizeof(*pending_reclaims[i].queue)); | |
416 | for (i = 0; i < nr_writers; i++) | |
417 | pending_reclaims[i].head = pending_reclaims[i].queue; | |
418 | ||
2a7ac59d MD |
419 | next_aff = 0; |
420 | ||
a813abf8 MD |
421 | for (i = 0; i < nr_readers; i++) { |
422 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
423 | &count_reader[i]); | |
424 | if (err != 0) | |
425 | exit(1); | |
426 | } | |
427 | for (i = 0; i < nr_writers; i++) { | |
428 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
429 | (void *)(long)i); | |
430 | if (err != 0) | |
431 | exit(1); | |
432 | } | |
433 | ||
434 | smp_mb(); | |
435 | ||
436 | test_go = 1; | |
437 | ||
438 | sleep(duration); | |
439 | ||
440 | test_stop = 1; | |
441 | ||
442 | for (i = 0; i < nr_readers; i++) { | |
443 | err = pthread_join(tid_reader[i], &tret); | |
444 | if (err != 0) | |
445 | exit(1); | |
446 | tot_reads += count_reader[i]; | |
447 | } | |
448 | for (i = 0; i < nr_writers; i++) { | |
449 | err = pthread_join(tid_writer[i], &tret); | |
450 | if (err != 0) | |
451 | exit(1); | |
452 | tot_writes += tot_nr_writes[i]; | |
53091fe5 | 453 | rcu_gc_clear_queue(i); |
a813abf8 MD |
454 | } |
455 | ||
456 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, | |
457 | tot_writes); | |
458 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " | |
459 | "nr_writers %3u " | |
4a3e0004 MD |
460 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu " |
461 | "batch %u\n", | |
a813abf8 MD |
462 | argv[0], duration, nr_readers, rduration, |
463 | nr_writers, wdelay, tot_reads, tot_writes, | |
4a3e0004 | 464 | tot_reads + tot_writes, reclaim_batch); |
a813abf8 MD |
465 | free(tid_reader); |
466 | free(tid_writer); | |
467 | free(count_reader); | |
468 | free(tot_nr_writes); | |
469 | for (i = 0; i < nr_writers; i++) | |
470 | free(pending_reclaims[i].queue); | |
471 | free(pending_reclaims); | |
472 | ||
473 | return 0; | |
474 | } |