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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 | |
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> |
a813abf8 | 36 | |
ec4e58a3 | 37 | #include <urcu/arch.h> |
a813abf8 | 38 | |
2a7ac59d MD |
39 | /* hardcoded number of CPUs */ |
40 | #define NR_CPUS 16384 | |
41 | ||
a813abf8 MD |
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 | #define _LGPL_SOURCE | |
ec4e58a3 | 58 | #include <urcu-qsbr.h> |
a813abf8 MD |
59 | |
60 | struct test_array { | |
61 | int a; | |
62 | }; | |
63 | ||
64 | static volatile int test_go, test_stop; | |
65 | ||
66 | static unsigned long wdelay; | |
67 | ||
68 | static struct test_array *test_rcu_pointer; | |
69 | ||
70 | static unsigned long duration; | |
71 | ||
72 | /* read-side C.S. duration, in loops */ | |
73 | static unsigned long rduration; | |
4a3e0004 | 74 | static unsigned int reclaim_batch = 1; |
a813abf8 MD |
75 | |
76 | struct reclaim_queue { | |
77 | void **queue; /* Beginning of queue */ | |
78 | void **head; /* Insert position */ | |
79 | }; | |
80 | ||
81 | static struct reclaim_queue *pending_reclaims; | |
82 | ||
83 | ||
84 | static inline void loop_sleep(unsigned long l) | |
85 | { | |
86 | while(l-- != 0) | |
87 | cpu_relax(); | |
88 | } | |
89 | ||
90 | static int verbose_mode; | |
91 | ||
92 | #define printf_verbose(fmt, args...) \ | |
93 | do { \ | |
94 | if (verbose_mode) \ | |
95 | printf(fmt, args); \ | |
96 | } while (0) | |
97 | ||
2a7ac59d MD |
98 | static unsigned int cpu_affinities[NR_CPUS]; |
99 | static unsigned int next_aff = 0; | |
100 | static int use_affinity = 0; | |
101 | ||
6af882ba MD |
102 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; |
103 | ||
2a7ac59d MD |
104 | static void set_affinity(void) |
105 | { | |
106 | cpu_set_t mask; | |
107 | int cpu; | |
6af882ba | 108 | int ret; |
2a7ac59d MD |
109 | |
110 | if (!use_affinity) | |
111 | return; | |
112 | ||
6af882ba MD |
113 | ret = pthread_mutex_lock(&affinity_mutex); |
114 | if (ret) { | |
115 | perror("Error in pthread mutex lock"); | |
116 | exit(-1); | |
117 | } | |
2a7ac59d | 118 | cpu = cpu_affinities[next_aff++]; |
6af882ba MD |
119 | ret = pthread_mutex_unlock(&affinity_mutex); |
120 | if (ret) { | |
121 | perror("Error in pthread mutex unlock"); | |
122 | exit(-1); | |
123 | } | |
2a7ac59d MD |
124 | CPU_ZERO(&mask); |
125 | CPU_SET(cpu, &mask); | |
126 | sched_setaffinity(0, sizeof(mask), &mask); | |
127 | } | |
128 | ||
a813abf8 MD |
129 | /* |
130 | * returns 0 if test should end. | |
131 | */ | |
132 | static int test_duration_write(void) | |
133 | { | |
134 | return !test_stop; | |
135 | } | |
136 | ||
137 | static int test_duration_read(void) | |
138 | { | |
139 | return !test_stop; | |
140 | } | |
141 | ||
142 | static unsigned long long __thread nr_writes; | |
143 | static unsigned long long __thread nr_reads; | |
144 | ||
145 | static unsigned int nr_readers; | |
146 | static unsigned int nr_writers; | |
147 | ||
148 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
149 | static | |
150 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes; | |
151 | ||
152 | ||
153 | void rcu_copy_mutex_lock(void) | |
154 | { | |
155 | int ret; | |
156 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
157 | if (ret) { | |
158 | perror("Error in pthread mutex lock"); | |
159 | exit(-1); | |
160 | } | |
161 | } | |
162 | ||
163 | void rcu_copy_mutex_unlock(void) | |
164 | { | |
165 | int ret; | |
166 | ||
167 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
168 | if (ret) { | |
169 | perror("Error in pthread mutex unlock"); | |
170 | exit(-1); | |
171 | } | |
172 | } | |
173 | ||
174 | void *thr_reader(void *_count) | |
175 | { | |
176 | unsigned long long *count = _count; | |
177 | struct test_array *local_ptr; | |
178 | ||
179 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
180 | "reader", pthread_self(), (unsigned long)gettid()); | |
181 | ||
2a7ac59d MD |
182 | set_affinity(); |
183 | ||
a813abf8 MD |
184 | rcu_register_thread(); |
185 | ||
186 | while (!test_go) | |
187 | { | |
188 | } | |
189 | smp_mb(); | |
190 | ||
191 | for (;;) { | |
192 | _rcu_read_lock(); | |
193 | local_ptr = _rcu_dereference(test_rcu_pointer); | |
194 | debug_yield_read(); | |
195 | if (local_ptr) | |
196 | assert(local_ptr->a == 8); | |
197 | if (unlikely(rduration)) | |
198 | loop_sleep(rduration); | |
199 | _rcu_read_unlock(); | |
200 | nr_reads++; | |
201 | /* QS each 1024 reads */ | |
202 | if (unlikely((nr_reads & ((1 << 10) - 1)) == 0)) | |
203 | _rcu_quiescent_state(); | |
204 | if (unlikely(!test_duration_read())) | |
205 | break; | |
206 | } | |
207 | ||
208 | rcu_unregister_thread(); | |
209 | ||
210 | *count = nr_reads; | |
211 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
212 | "reader", pthread_self(), (unsigned long)gettid()); | |
213 | return ((void*)1); | |
214 | ||
215 | } | |
216 | ||
53091fe5 | 217 | static void rcu_gc_clear_queue(unsigned long wtidx) |
a813abf8 MD |
218 | { |
219 | void **p; | |
220 | ||
53091fe5 | 221 | /* Wait for Q.S and empty queue */ |
a813abf8 MD |
222 | synchronize_rcu(); |
223 | ||
224 | for (p = pending_reclaims[wtidx].queue; | |
225 | p < pending_reclaims[wtidx].head; p++) { | |
226 | /* poison */ | |
227 | if (*p) | |
228 | ((struct test_array *)*p)->a = 0; | |
229 | free(*p); | |
230 | } | |
231 | pending_reclaims[wtidx].head = pending_reclaims[wtidx].queue; | |
232 | } | |
233 | ||
53091fe5 MD |
234 | /* Using per-thread queue */ |
235 | static void rcu_gc_reclaim(unsigned long wtidx, void *old) | |
a813abf8 | 236 | { |
53091fe5 MD |
237 | /* Queue pointer */ |
238 | *pending_reclaims[wtidx].head = old; | |
239 | pending_reclaims[wtidx].head++; | |
a813abf8 | 240 | |
53091fe5 MD |
241 | if (likely(pending_reclaims[wtidx].head - pending_reclaims[wtidx].queue |
242 | < reclaim_batch)) | |
243 | return; | |
a813abf8 | 244 | |
53091fe5 | 245 | rcu_gc_clear_queue(wtidx); |
a813abf8 MD |
246 | } |
247 | ||
248 | void *thr_writer(void *data) | |
249 | { | |
250 | unsigned long wtidx = (unsigned long)data; | |
321e29d9 MD |
251 | #ifdef TEST_LOCAL_GC |
252 | struct test_array *old = NULL; | |
253 | #else | |
a813abf8 | 254 | struct test_array *new, *old; |
321e29d9 | 255 | #endif |
a813abf8 MD |
256 | |
257 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
258 | "writer", pthread_self(), (unsigned long)gettid()); | |
259 | ||
2a7ac59d MD |
260 | set_affinity(); |
261 | ||
a813abf8 MD |
262 | while (!test_go) |
263 | { | |
264 | } | |
265 | smp_mb(); | |
266 | ||
267 | for (;;) { | |
321e29d9 | 268 | #ifndef TEST_LOCAL_GC |
a813abf8 | 269 | new = malloc(sizeof(*new)); |
a813abf8 MD |
270 | new->a = 8; |
271 | old = _rcu_xchg_pointer(&test_rcu_pointer, new); | |
321e29d9 | 272 | #endif |
a813abf8 MD |
273 | rcu_gc_reclaim(wtidx, old); |
274 | nr_writes++; | |
275 | if (unlikely(!test_duration_write())) | |
276 | break; | |
277 | if (unlikely(wdelay)) | |
278 | loop_sleep(wdelay); | |
279 | } | |
280 | ||
281 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
282 | "writer", pthread_self(), (unsigned long)gettid()); | |
283 | tot_nr_writes[wtidx] = nr_writes; | |
284 | return ((void*)2); | |
285 | } | |
286 | ||
287 | void show_usage(int argc, char **argv) | |
288 | { | |
289 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
290 | #ifdef DEBUG_YIELD | |
291 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
292 | #endif | |
293 | printf(" [-d delay] (writer period (us))"); | |
294 | printf(" [-c duration] (reader C.S. duration (in loops))"); | |
295 | printf(" [-v] (verbose output)"); | |
296 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); | |
297 | printf("\n"); | |
298 | } | |
299 | ||
a813abf8 MD |
300 | int main(int argc, char **argv) |
301 | { | |
302 | int err; | |
303 | pthread_t *tid_reader, *tid_writer; | |
304 | void *tret; | |
305 | unsigned long long *count_reader; | |
306 | unsigned long long tot_reads = 0, tot_writes = 0; | |
307 | int i, a; | |
a813abf8 MD |
308 | |
309 | if (argc < 4) { | |
310 | show_usage(argc, argv); | |
311 | return -1; | |
312 | } | |
313 | ||
314 | err = sscanf(argv[1], "%u", &nr_readers); | |
315 | if (err != 1) { | |
316 | show_usage(argc, argv); | |
317 | return -1; | |
318 | } | |
319 | ||
320 | err = sscanf(argv[2], "%u", &nr_writers); | |
321 | if (err != 1) { | |
322 | show_usage(argc, argv); | |
323 | return -1; | |
324 | } | |
325 | ||
326 | err = sscanf(argv[3], "%lu", &duration); | |
327 | if (err != 1) { | |
328 | show_usage(argc, argv); | |
329 | return -1; | |
330 | } | |
331 | ||
a813abf8 MD |
332 | for (i = 4; i < argc; i++) { |
333 | if (argv[i][0] != '-') | |
334 | continue; | |
335 | switch (argv[i][1]) { | |
336 | #ifdef DEBUG_YIELD | |
337 | case 'r': | |
338 | yield_active |= YIELD_READ; | |
339 | break; | |
340 | case 'w': | |
341 | yield_active |= YIELD_WRITE; | |
342 | break; | |
343 | #endif | |
344 | case 'a': | |
345 | if (argc < i + 2) { | |
346 | show_usage(argc, argv); | |
347 | return -1; | |
348 | } | |
349 | a = atoi(argv[++i]); | |
2a7ac59d | 350 | cpu_affinities[next_aff++] = a; |
a813abf8 MD |
351 | use_affinity = 1; |
352 | printf_verbose("Adding CPU %d affinity\n", a); | |
353 | break; | |
354 | case 'b': | |
355 | if (argc < i + 2) { | |
356 | show_usage(argc, argv); | |
357 | return -1; | |
358 | } | |
359 | reclaim_batch = atol(argv[++i]); | |
360 | break; | |
361 | case 'c': | |
362 | if (argc < i + 2) { | |
363 | show_usage(argc, argv); | |
364 | return -1; | |
365 | } | |
366 | rduration = atol(argv[++i]); | |
367 | break; | |
368 | case 'd': | |
369 | if (argc < i + 2) { | |
370 | show_usage(argc, argv); | |
371 | return -1; | |
372 | } | |
373 | wdelay = atol(argv[++i]); | |
374 | break; | |
375 | case 'v': | |
376 | verbose_mode = 1; | |
377 | break; | |
378 | } | |
379 | } | |
380 | ||
381 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", | |
382 | duration, nr_readers, nr_writers); | |
383 | printf_verbose("Writer delay : %lu loops.\n", wdelay); | |
384 | printf_verbose("Reader duration : %lu loops.\n", rduration); | |
385 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
386 | "main", pthread_self(), (unsigned long)gettid()); | |
387 | ||
a813abf8 MD |
388 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); |
389 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
390 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
391 | tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers); | |
392 | pending_reclaims = malloc(sizeof(*pending_reclaims) * nr_writers); | |
393 | if (reclaim_batch * sizeof(*pending_reclaims[i].queue) | |
394 | < CACHE_LINE_SIZE) | |
395 | for (i = 0; i < nr_writers; i++) | |
396 | pending_reclaims[i].queue = calloc(1, CACHE_LINE_SIZE); | |
397 | else | |
398 | for (i = 0; i < nr_writers; i++) | |
399 | pending_reclaims[i].queue = calloc(reclaim_batch, | |
400 | sizeof(*pending_reclaims[i].queue)); | |
401 | for (i = 0; i < nr_writers; i++) | |
402 | pending_reclaims[i].head = pending_reclaims[i].queue; | |
403 | ||
2a7ac59d MD |
404 | next_aff = 0; |
405 | ||
a813abf8 MD |
406 | for (i = 0; i < nr_readers; i++) { |
407 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
408 | &count_reader[i]); | |
409 | if (err != 0) | |
410 | exit(1); | |
411 | } | |
412 | for (i = 0; i < nr_writers; i++) { | |
413 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
414 | (void *)(long)i); | |
415 | if (err != 0) | |
416 | exit(1); | |
417 | } | |
418 | ||
419 | smp_mb(); | |
420 | ||
421 | test_go = 1; | |
422 | ||
423 | sleep(duration); | |
424 | ||
425 | test_stop = 1; | |
426 | ||
427 | for (i = 0; i < nr_readers; i++) { | |
428 | err = pthread_join(tid_reader[i], &tret); | |
429 | if (err != 0) | |
430 | exit(1); | |
431 | tot_reads += count_reader[i]; | |
432 | } | |
433 | for (i = 0; i < nr_writers; i++) { | |
434 | err = pthread_join(tid_writer[i], &tret); | |
435 | if (err != 0) | |
436 | exit(1); | |
437 | tot_writes += tot_nr_writes[i]; | |
53091fe5 | 438 | rcu_gc_clear_queue(i); |
a813abf8 MD |
439 | } |
440 | ||
441 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, | |
442 | tot_writes); | |
443 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " | |
444 | "nr_writers %3u " | |
4a3e0004 MD |
445 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu " |
446 | "batch %u\n", | |
a813abf8 MD |
447 | argv[0], duration, nr_readers, rduration, |
448 | nr_writers, wdelay, tot_reads, tot_writes, | |
4a3e0004 | 449 | tot_reads + tot_writes, reclaim_batch); |
a813abf8 MD |
450 | free(tid_reader); |
451 | free(tid_writer); | |
452 | free(count_reader); | |
453 | free(tot_nr_writes); | |
454 | for (i = 0; i < nr_writers; i++) | |
455 | free(pending_reclaims[i].queue); | |
456 | free(pending_reclaims); | |
457 | ||
458 | return 0; | |
459 | } |