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> | |
35 | ||
36 | #include "../arch.h" | |
37 | ||
38 | /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */ | |
39 | #define CACHE_LINE_SIZE 4096 | |
40 | ||
41 | /* hardcoded number of CPUs */ | |
42 | #define NR_CPUS 16384 | |
43 | ||
44 | #if defined(_syscall0) | |
45 | _syscall0(pid_t, gettid) | |
46 | #elif defined(__NR_gettid) | |
47 | static inline pid_t gettid(void) | |
48 | { | |
49 | return syscall(__NR_gettid); | |
50 | } | |
51 | #else | |
52 | #warning "use pid as tid" | |
53 | static inline pid_t gettid(void) | |
54 | { | |
55 | return getpid(); | |
56 | } | |
57 | #endif | |
58 | ||
59 | #ifndef DYNAMIC_LINK_TEST | |
60 | #define _LGPL_SOURCE | |
61 | #else | |
62 | #define debug_yield_read() | |
63 | #endif | |
64 | #include "../urcu.h" | |
786ee85b | 65 | #include "../urcu-defer.h" |
90075a50 MD |
66 | |
67 | struct test_array { | |
68 | int a; | |
69 | }; | |
70 | ||
71 | static volatile int test_go, test_stop; | |
72 | ||
73 | static unsigned long wdelay; | |
74 | ||
75 | static struct test_array *test_rcu_pointer; | |
76 | ||
77 | static unsigned long duration; | |
78 | ||
79 | /* read-side C.S. duration, in loops */ | |
80 | static unsigned long rduration; | |
81 | ||
82 | static inline void loop_sleep(unsigned long l) | |
83 | { | |
84 | while(l-- != 0) | |
85 | cpu_relax(); | |
86 | } | |
87 | ||
88 | static int verbose_mode; | |
89 | ||
90 | #define printf_verbose(fmt, args...) \ | |
91 | do { \ | |
92 | if (verbose_mode) \ | |
93 | printf(fmt, args); \ | |
94 | } while (0) | |
95 | ||
96 | static unsigned int cpu_affinities[NR_CPUS]; | |
97 | static unsigned int next_aff = 0; | |
98 | static int use_affinity = 0; | |
99 | ||
100 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; | |
101 | ||
102 | static void set_affinity(void) | |
103 | { | |
104 | cpu_set_t mask; | |
105 | int cpu; | |
106 | int ret; | |
107 | ||
108 | if (!use_affinity) | |
109 | return; | |
110 | ||
111 | ret = pthread_mutex_lock(&affinity_mutex); | |
112 | if (ret) { | |
113 | perror("Error in pthread mutex lock"); | |
114 | exit(-1); | |
115 | } | |
116 | cpu = cpu_affinities[next_aff++]; | |
117 | ret = pthread_mutex_unlock(&affinity_mutex); | |
118 | if (ret) { | |
119 | perror("Error in pthread mutex unlock"); | |
120 | exit(-1); | |
121 | } | |
122 | CPU_ZERO(&mask); | |
123 | CPU_SET(cpu, &mask); | |
124 | sched_setaffinity(0, sizeof(mask), &mask); | |
125 | } | |
126 | ||
127 | /* | |
128 | * returns 0 if test should end. | |
129 | */ | |
130 | static int test_duration_write(void) | |
131 | { | |
132 | return !test_stop; | |
133 | } | |
134 | ||
135 | static int test_duration_read(void) | |
136 | { | |
137 | return !test_stop; | |
138 | } | |
139 | ||
140 | static unsigned long long __thread nr_writes; | |
141 | static unsigned long long __thread nr_reads; | |
142 | ||
143 | static | |
144 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes; | |
145 | ||
146 | static unsigned int nr_readers; | |
147 | static unsigned int nr_writers; | |
148 | ||
149 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
150 | ||
151 | void rcu_copy_mutex_lock(void) | |
152 | { | |
153 | int ret; | |
154 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
155 | if (ret) { | |
156 | perror("Error in pthread mutex lock"); | |
157 | exit(-1); | |
158 | } | |
159 | } | |
160 | ||
161 | void rcu_copy_mutex_unlock(void) | |
162 | { | |
163 | int ret; | |
164 | ||
165 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
166 | if (ret) { | |
167 | perror("Error in pthread mutex unlock"); | |
168 | exit(-1); | |
169 | } | |
170 | } | |
171 | ||
172 | void *thr_reader(void *_count) | |
173 | { | |
174 | unsigned long long *count = _count; | |
175 | struct test_array *local_ptr; | |
176 | ||
177 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
178 | "reader", pthread_self(), (unsigned long)gettid()); | |
179 | ||
180 | set_affinity(); | |
181 | ||
182 | rcu_register_thread(); | |
183 | ||
184 | while (!test_go) | |
185 | { | |
186 | } | |
187 | smp_mb(); | |
188 | ||
189 | for (;;) { | |
190 | rcu_read_lock(); | |
191 | local_ptr = rcu_dereference(test_rcu_pointer); | |
192 | debug_yield_read(); | |
193 | if (local_ptr) | |
194 | assert(local_ptr->a == 8); | |
195 | if (unlikely(rduration)) | |
196 | loop_sleep(rduration); | |
197 | rcu_read_unlock(); | |
198 | nr_reads++; | |
199 | if (unlikely(!test_duration_read())) | |
200 | break; | |
201 | } | |
202 | ||
203 | rcu_unregister_thread(); | |
204 | ||
205 | *count = nr_reads; | |
206 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
207 | "reader", pthread_self(), (unsigned long)gettid()); | |
208 | return ((void*)1); | |
209 | ||
210 | } | |
211 | ||
804b4375 MD |
212 | static void test_cb2(void *data) |
213 | { | |
214 | } | |
215 | ||
216 | static void test_cb1(void *data) | |
217 | { | |
218 | } | |
219 | ||
90075a50 MD |
220 | void *thr_writer(void *data) |
221 | { | |
222 | unsigned long wtidx = (unsigned long)data; | |
223 | struct test_array *new, *old = NULL; | |
224 | ||
225 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
226 | "writer", pthread_self(), (unsigned long)gettid()); | |
227 | ||
228 | set_affinity(); | |
229 | ||
786ee85b | 230 | rcu_defer_register_thread(); |
90075a50 MD |
231 | |
232 | while (!test_go) | |
233 | { | |
234 | } | |
235 | smp_mb(); | |
236 | ||
237 | for (;;) { | |
238 | new = malloc(sizeof(*new)); | |
239 | new->a = 8; | |
240 | old = rcu_xchg_pointer(&test_rcu_pointer, new); | |
804b4375 | 241 | call_rcu(free, old); |
804b4375 MD |
242 | call_rcu(test_cb1, old); |
243 | call_rcu(test_cb1, (void *)-2L); | |
244 | call_rcu(test_cb1, (void *)-2L); | |
245 | call_rcu(test_cb1, old); | |
246 | call_rcu(test_cb2, (void *)-2L); | |
804b4375 | 247 | call_rcu(test_cb2, (void *)-4L); |
48f9433c | 248 | call_rcu(test_cb2, (void *)-2L); |
90075a50 MD |
249 | nr_writes++; |
250 | if (unlikely(!test_duration_write())) | |
251 | break; | |
252 | if (unlikely(wdelay)) | |
253 | loop_sleep(wdelay); | |
254 | } | |
255 | ||
786ee85b | 256 | rcu_defer_unregister_thread(); |
90075a50 MD |
257 | |
258 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
259 | "writer", pthread_self(), (unsigned long)gettid()); | |
260 | tot_nr_writes[wtidx] = nr_writes; | |
261 | return ((void*)2); | |
262 | } | |
263 | ||
264 | void show_usage(int argc, char **argv) | |
265 | { | |
266 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
267 | #ifdef DEBUG_YIELD | |
268 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
269 | #endif | |
270 | printf(" [-d delay] (writer period (us))"); | |
271 | printf(" [-c duration] (reader C.S. duration (in loops))"); | |
272 | printf(" [-v] (verbose output)"); | |
273 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); | |
274 | printf("\n"); | |
275 | } | |
276 | ||
277 | int main(int argc, char **argv) | |
278 | { | |
279 | int err; | |
280 | pthread_t *tid_reader, *tid_writer; | |
281 | void *tret; | |
282 | unsigned long long *count_reader; | |
283 | unsigned long long tot_reads = 0, tot_writes = 0; | |
284 | int i, a; | |
285 | ||
286 | if (argc < 4) { | |
287 | show_usage(argc, argv); | |
288 | return -1; | |
289 | } | |
290 | ||
291 | err = sscanf(argv[1], "%u", &nr_readers); | |
292 | if (err != 1) { | |
293 | show_usage(argc, argv); | |
294 | return -1; | |
295 | } | |
296 | ||
297 | err = sscanf(argv[2], "%u", &nr_writers); | |
298 | if (err != 1) { | |
299 | show_usage(argc, argv); | |
300 | return -1; | |
301 | } | |
302 | ||
303 | err = sscanf(argv[3], "%lu", &duration); | |
304 | if (err != 1) { | |
305 | show_usage(argc, argv); | |
306 | return -1; | |
307 | } | |
308 | ||
309 | for (i = 4; i < argc; i++) { | |
310 | if (argv[i][0] != '-') | |
311 | continue; | |
312 | switch (argv[i][1]) { | |
313 | #ifdef DEBUG_YIELD | |
314 | case 'r': | |
315 | yield_active |= YIELD_READ; | |
316 | break; | |
317 | case 'w': | |
318 | yield_active |= YIELD_WRITE; | |
319 | break; | |
320 | #endif | |
321 | case 'a': | |
322 | if (argc < i + 2) { | |
323 | show_usage(argc, argv); | |
324 | return -1; | |
325 | } | |
326 | a = atoi(argv[++i]); | |
327 | cpu_affinities[next_aff++] = a; | |
328 | use_affinity = 1; | |
329 | printf_verbose("Adding CPU %d affinity\n", a); | |
330 | break; | |
331 | case 'c': | |
332 | if (argc < i + 2) { | |
333 | show_usage(argc, argv); | |
334 | return -1; | |
335 | } | |
336 | rduration = atol(argv[++i]); | |
337 | break; | |
338 | case 'd': | |
339 | if (argc < i + 2) { | |
340 | show_usage(argc, argv); | |
341 | return -1; | |
342 | } | |
343 | wdelay = atol(argv[++i]); | |
344 | break; | |
345 | case 'v': | |
346 | verbose_mode = 1; | |
347 | break; | |
348 | } | |
349 | } | |
350 | ||
351 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", | |
352 | duration, nr_readers, nr_writers); | |
353 | printf_verbose("Writer delay : %lu loops.\n", wdelay); | |
354 | printf_verbose("Reader duration : %lu loops.\n", rduration); | |
355 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
356 | "main", pthread_self(), (unsigned long)gettid()); | |
357 | ||
358 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
359 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
360 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
361 | tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers); | |
362 | ||
363 | next_aff = 0; | |
364 | ||
365 | for (i = 0; i < nr_readers; i++) { | |
366 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
367 | &count_reader[i]); | |
368 | if (err != 0) | |
369 | exit(1); | |
370 | } | |
371 | for (i = 0; i < nr_writers; i++) { | |
372 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
373 | (void *)(long)i); | |
374 | if (err != 0) | |
375 | exit(1); | |
376 | } | |
377 | ||
378 | smp_mb(); | |
379 | ||
380 | test_go = 1; | |
381 | ||
382 | sleep(duration); | |
383 | ||
384 | test_stop = 1; | |
385 | ||
386 | for (i = 0; i < nr_readers; i++) { | |
387 | err = pthread_join(tid_reader[i], &tret); | |
388 | if (err != 0) | |
389 | exit(1); | |
390 | tot_reads += count_reader[i]; | |
391 | } | |
392 | for (i = 0; i < nr_writers; i++) { | |
393 | err = pthread_join(tid_writer[i], &tret); | |
394 | if (err != 0) | |
395 | exit(1); | |
396 | tot_writes += tot_nr_writes[i]; | |
397 | } | |
398 | ||
399 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, | |
400 | tot_writes); | |
401 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " | |
402 | "nr_writers %3u " | |
403 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", | |
404 | argv[0], duration, nr_readers, rduration, | |
405 | nr_writers, wdelay, tot_reads, tot_writes, | |
406 | tot_reads + tot_writes); | |
407 | free(tid_reader); | |
408 | free(tid_writer); | |
409 | free(count_reader); | |
410 | free(tot_nr_writes); | |
411 | ||
412 | return 0; | |
413 | } |