Commit | Line | Data |
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ce29b371 MJ |
1 | // SPDX-FileCopyrightText: 2008 Paul E. McKenney, IBM Corporation. |
2 | // | |
3 | // SPDX-License-Identifier: GPL-2.0-or-later | |
4 | ||
8a953620 MD |
5 | /* |
6 | * rcutorture.h: simple user-level performance/stress test of RCU. | |
7 | * | |
8 | * Usage: | |
9 | * ./rcu <nreaders> rperf [ <cpustride> ] | |
10 | * Run a read-side performance test with the specified | |
11 | * number of readers spaced by <cpustride>. | |
12 | * Thus "./rcu 16 rperf 2" would run 16 readers on even-numbered | |
13 | * CPUs from 0 to 30. | |
14 | * ./rcu <nupdaters> uperf [ <cpustride> ] | |
15 | * Run an update-side performance test with the specified | |
16 | * number of updaters and specified CPU spacing. | |
17 | * ./rcu <nreaders> perf [ <cpustride> ] | |
18 | * Run a combined read/update performance test with the specified | |
19 | * number of readers and one updater and specified CPU spacing. | |
20 | * The readers run on the low-numbered CPUs and the updater | |
21 | * of the highest-numbered CPU. | |
22 | * | |
23 | * The above tests produce output as follows: | |
24 | * | |
25 | * n_reads: 46008000 n_updates: 146026 nreaders: 2 nupdaters: 1 duration: 1 | |
26 | * ns/read: 43.4707 ns/update: 6848.1 | |
27 | * | |
28 | * The first line lists the total number of RCU reads and updates executed | |
29 | * during the test, the number of reader threads, the number of updater | |
30 | * threads, and the duration of the test in seconds. The second line | |
31 | * lists the average duration of each type of operation in nanoseconds, | |
32 | * or "nan" if the corresponding type of operation was not performed. | |
33 | * | |
34 | * ./rcu <nreaders> stress | |
35 | * Run a stress test with the specified number of readers and | |
36 | * one updater. None of the threads are affinitied to any | |
37 | * particular CPU. | |
38 | * | |
39 | * This test produces output as follows: | |
40 | * | |
41 | * n_reads: 114633217 n_updates: 3903415 n_mberror: 0 | |
42 | * rcu_stress_count: 114618391 14826 0 0 0 0 0 0 0 0 0 | |
43 | * | |
44 | * The first line lists the number of RCU read and update operations | |
45 | * executed, followed by the number of memory-ordering violations | |
46 | * (which will be zero in a correct RCU implementation). The second | |
47 | * line lists the number of readers observing progressively more stale | |
48 | * data. A correct RCU implementation will have all but the first two | |
49 | * numbers non-zero. | |
8a953620 MD |
50 | */ |
51 | ||
52 | /* | |
53 | * Test variables. | |
54 | */ | |
55 | ||
b57aee66 | 56 | #include <stdlib.h> |
ad460058 MD |
57 | #include "tap.h" |
58 | ||
59 | #define NR_TESTS 1 | |
b57aee66 | 60 | |
8a953620 MD |
61 | DEFINE_PER_THREAD(long long, n_reads_pt); |
62 | DEFINE_PER_THREAD(long long, n_updates_pt); | |
63 | ||
26b5a74b MD |
64 | enum callrcu_type { |
65 | CALLRCU_GLOBAL, | |
66 | CALLRCU_PERCPU, | |
67 | CALLRCU_PERTHREAD, | |
68 | }; | |
69 | ||
eb218d4f MD |
70 | enum writer_state { |
71 | WRITER_STATE_SYNC_RCU, | |
72 | WRITER_STATE_CALL_RCU, | |
73 | WRITER_STATE_POLL_RCU, | |
74 | }; | |
75 | ||
26b5a74b MD |
76 | static enum callrcu_type callrcu_type = CALLRCU_GLOBAL; |
77 | ||
8a953620 MD |
78 | long long n_reads = 0LL; |
79 | long n_updates = 0L; | |
6ee91d83 | 80 | int nthreadsrunning; |
8a953620 MD |
81 | char argsbuf[64]; |
82 | ||
83 | #define GOFLAG_INIT 0 | |
84 | #define GOFLAG_RUN 1 | |
85 | #define GOFLAG_STOP 2 | |
86 | ||
4967f005 PB |
87 | volatile int goflag __attribute__((__aligned__(CAA_CACHE_LINE_SIZE))) |
88 | = GOFLAG_INIT; | |
8a953620 MD |
89 | |
90 | #define RCU_READ_RUN 1000 | |
91 | ||
92 | //MD | |
93 | #define RCU_READ_NESTABLE | |
94 | ||
95 | #ifdef RCU_READ_NESTABLE | |
96 | #define rcu_read_lock_nest() rcu_read_lock() | |
97 | #define rcu_read_unlock_nest() rcu_read_unlock() | |
98 | #else /* #ifdef RCU_READ_NESTABLE */ | |
99 | #define rcu_read_lock_nest() | |
100 | #define rcu_read_unlock_nest() | |
101 | #endif /* #else #ifdef RCU_READ_NESTABLE */ | |
102 | ||
1a43bbd8 MD |
103 | #ifdef TORTURE_QSBR |
104 | #define mark_rcu_quiescent_state rcu_quiescent_state | |
105 | #define put_thread_offline rcu_thread_offline | |
106 | #define put_thread_online rcu_thread_online | |
107 | #endif | |
108 | ||
8a953620 | 109 | #ifndef mark_rcu_quiescent_state |
447c9339 | 110 | #define mark_rcu_quiescent_state() do {} while (0) |
8a953620 MD |
111 | #endif /* #ifdef mark_rcu_quiescent_state */ |
112 | ||
113 | #ifndef put_thread_offline | |
447c9339 MJ |
114 | #define put_thread_offline() do {} while (0) |
115 | #define put_thread_online() do {} while (0) | |
116 | #define put_thread_online_delay() do {} while (0) | |
8a953620 MD |
117 | #else /* #ifndef put_thread_offline */ |
118 | #define put_thread_online_delay() synchronize_rcu() | |
119 | #endif /* #else #ifndef put_thread_offline */ | |
120 | ||
121 | /* | |
122 | * Performance test. | |
123 | */ | |
124 | ||
61c3fb60 | 125 | static |
8a953620 MD |
126 | void *rcu_read_perf_test(void *arg) |
127 | { | |
128 | int i; | |
129 | int me = (long)arg; | |
8a953620 MD |
130 | long long n_reads_local = 0; |
131 | ||
121a5d44 | 132 | rcu_register_thread(); |
8a953620 | 133 | run_on(me); |
ec4e58a3 | 134 | uatomic_inc(&nthreadsrunning); |
3bf02b5b | 135 | put_thread_offline(); |
8a953620 | 136 | while (goflag == GOFLAG_INIT) |
775aff2e | 137 | (void) poll(NULL, 0, 1); |
3bf02b5b | 138 | put_thread_online(); |
8a953620 MD |
139 | while (goflag == GOFLAG_RUN) { |
140 | for (i = 0; i < RCU_READ_RUN; i++) { | |
141 | rcu_read_lock(); | |
142 | /* rcu_read_lock_nest(); */ | |
143 | /* rcu_read_unlock_nest(); */ | |
144 | rcu_read_unlock(); | |
145 | } | |
146 | n_reads_local += RCU_READ_RUN; | |
147 | mark_rcu_quiescent_state(); | |
148 | } | |
149 | __get_thread_var(n_reads_pt) += n_reads_local; | |
150 | put_thread_offline(); | |
121a5d44 | 151 | rcu_unregister_thread(); |
8a953620 MD |
152 | |
153 | return (NULL); | |
154 | } | |
155 | ||
61c3fb60 | 156 | static |
70469b43 | 157 | void *rcu_update_perf_test(void *arg __attribute__((unused))) |
8a953620 MD |
158 | { |
159 | long long n_updates_local = 0; | |
160 | ||
26b5a74b | 161 | if (callrcu_type == CALLRCU_PERTHREAD) { |
b57aee66 PM |
162 | struct call_rcu_data *crdp; |
163 | ||
c1d2c60b | 164 | crdp = create_call_rcu_data(0, -1); |
b57aee66 | 165 | if (crdp != NULL) { |
26b5a74b | 166 | diag("Successfully using per-thread call_rcu() worker."); |
b57aee66 PM |
167 | set_thread_call_rcu_data(crdp); |
168 | } | |
169 | } | |
ec4e58a3 | 170 | uatomic_inc(&nthreadsrunning); |
8a953620 | 171 | while (goflag == GOFLAG_INIT) |
775aff2e | 172 | (void) poll(NULL, 0, 1); |
8a953620 MD |
173 | while (goflag == GOFLAG_RUN) { |
174 | synchronize_rcu(); | |
175 | n_updates_local++; | |
176 | } | |
177 | __get_thread_var(n_updates_pt) += n_updates_local; | |
26b5a74b MD |
178 | if (callrcu_type == CALLRCU_PERTHREAD) { |
179 | struct call_rcu_data *crdp; | |
180 | ||
181 | crdp = get_thread_call_rcu_data(); | |
182 | set_thread_call_rcu_data(NULL); | |
183 | call_rcu_data_free(crdp); | |
184 | } | |
b0b31506 | 185 | return NULL; |
8a953620 MD |
186 | } |
187 | ||
61c3fb60 | 188 | static |
8a953620 MD |
189 | void perftestinit(void) |
190 | { | |
191 | init_per_thread(n_reads_pt, 0LL); | |
192 | init_per_thread(n_updates_pt, 0LL); | |
ec4e58a3 | 193 | uatomic_set(&nthreadsrunning, 0); |
8a953620 MD |
194 | } |
195 | ||
61c3fb60 | 196 | static |
ad460058 | 197 | int perftestrun(int nthreads, int nreaders, int nupdaters) |
8a953620 MD |
198 | { |
199 | int t; | |
200 | int duration = 1; | |
201 | ||
5481ddb3 | 202 | cmm_smp_mb(); |
ec4e58a3 | 203 | while (uatomic_read(&nthreadsrunning) < nthreads) |
775aff2e | 204 | (void) poll(NULL, 0, 1); |
8a953620 | 205 | goflag = GOFLAG_RUN; |
5481ddb3 | 206 | cmm_smp_mb(); |
8a953620 | 207 | sleep(duration); |
5481ddb3 | 208 | cmm_smp_mb(); |
8a953620 | 209 | goflag = GOFLAG_STOP; |
5481ddb3 | 210 | cmm_smp_mb(); |
8a953620 MD |
211 | wait_all_threads(); |
212 | for_each_thread(t) { | |
213 | n_reads += per_thread(n_reads_pt, t); | |
214 | n_updates += per_thread(n_updates_pt, t); | |
215 | } | |
ad460058 | 216 | diag("n_reads: %lld n_updates: %ld nreaders: %d nupdaters: %d duration: %d", |
8a953620 | 217 | n_reads, n_updates, nreaders, nupdaters, duration); |
ad460058 | 218 | diag("ns/read: %g ns/update: %g", |
8a953620 MD |
219 | ((duration * 1000*1000*1000.*(double)nreaders) / |
220 | (double)n_reads), | |
221 | ((duration * 1000*1000*1000.*(double)nupdaters) / | |
222 | (double)n_updates)); | |
7106ddf8 | 223 | if (get_cpu_call_rcu_data(0)) { |
ad460058 | 224 | diag("Deallocating per-CPU call_rcu threads.\n"); |
7106ddf8 PM |
225 | free_all_cpu_call_rcu_data(); |
226 | } | |
ad460058 | 227 | return 0; |
8a953620 MD |
228 | } |
229 | ||
61c3fb60 | 230 | static |
ad460058 | 231 | int perftest(int nreaders, int cpustride) |
8a953620 MD |
232 | { |
233 | int i; | |
234 | long arg; | |
235 | ||
236 | perftestinit(); | |
237 | for (i = 0; i < nreaders; i++) { | |
238 | arg = (long)(i * cpustride); | |
239 | create_thread(rcu_read_perf_test, (void *)arg); | |
240 | } | |
241 | arg = (long)(i * cpustride); | |
242 | create_thread(rcu_update_perf_test, (void *)arg); | |
ad460058 | 243 | return perftestrun(i + 1, nreaders, 1); |
8a953620 MD |
244 | } |
245 | ||
61c3fb60 | 246 | static |
ad460058 | 247 | int rperftest(int nreaders, int cpustride) |
8a953620 MD |
248 | { |
249 | int i; | |
250 | long arg; | |
251 | ||
252 | perftestinit(); | |
253 | init_per_thread(n_reads_pt, 0LL); | |
254 | for (i = 0; i < nreaders; i++) { | |
255 | arg = (long)(i * cpustride); | |
256 | create_thread(rcu_read_perf_test, (void *)arg); | |
257 | } | |
ad460058 | 258 | return perftestrun(i, nreaders, 0); |
8a953620 MD |
259 | } |
260 | ||
61c3fb60 | 261 | static |
ad460058 | 262 | int uperftest(int nupdaters, int cpustride) |
8a953620 MD |
263 | { |
264 | int i; | |
265 | long arg; | |
266 | ||
267 | perftestinit(); | |
268 | init_per_thread(n_reads_pt, 0LL); | |
269 | for (i = 0; i < nupdaters; i++) { | |
270 | arg = (long)(i * cpustride); | |
271 | create_thread(rcu_update_perf_test, (void *)arg); | |
272 | } | |
ad460058 | 273 | return perftestrun(i, 0, nupdaters); |
8a953620 MD |
274 | } |
275 | ||
276 | /* | |
277 | * Stress test. | |
278 | */ | |
279 | ||
280 | #define RCU_STRESS_PIPE_LEN 10 | |
281 | ||
282 | struct rcu_stress { | |
283 | int pipe_count; | |
284 | int mbtest; | |
285 | }; | |
286 | ||
153b081a | 287 | struct rcu_stress rcu_stress_array[RCU_STRESS_PIPE_LEN] = { { 0, 0 } }; |
8a953620 MD |
288 | struct rcu_stress *rcu_stress_current; |
289 | int rcu_stress_idx = 0; | |
290 | ||
291 | int n_mberror = 0; | |
292 | DEFINE_PER_THREAD(long long [RCU_STRESS_PIPE_LEN + 1], rcu_stress_count); | |
293 | ||
294 | int garbage = 0; | |
295 | ||
61c3fb60 | 296 | static |
70469b43 | 297 | void *rcu_read_stress_test(void *arg __attribute__((unused))) |
8a953620 MD |
298 | { |
299 | int i; | |
300 | int itercnt = 0; | |
301 | struct rcu_stress *p; | |
302 | int pc; | |
303 | ||
121a5d44 | 304 | rcu_register_thread(); |
3bf02b5b | 305 | put_thread_offline(); |
8a953620 | 306 | while (goflag == GOFLAG_INIT) |
775aff2e | 307 | (void) poll(NULL, 0, 1); |
3bf02b5b | 308 | put_thread_online(); |
8a953620 MD |
309 | while (goflag == GOFLAG_RUN) { |
310 | rcu_read_lock(); | |
311 | p = rcu_dereference(rcu_stress_current); | |
312 | if (p->mbtest == 0) | |
313 | n_mberror++; | |
314 | rcu_read_lock_nest(); | |
315 | for (i = 0; i < 100; i++) | |
316 | garbage++; | |
317 | rcu_read_unlock_nest(); | |
318 | pc = p->pipe_count; | |
319 | rcu_read_unlock(); | |
320 | if ((pc > RCU_STRESS_PIPE_LEN) || (pc < 0)) | |
321 | pc = RCU_STRESS_PIPE_LEN; | |
322 | __get_thread_var(rcu_stress_count)[pc]++; | |
323 | __get_thread_var(n_reads_pt)++; | |
324 | mark_rcu_quiescent_state(); | |
325 | if ((++itercnt % 0x1000) == 0) { | |
326 | put_thread_offline(); | |
327 | put_thread_online_delay(); | |
328 | put_thread_online(); | |
329 | } | |
330 | } | |
331 | put_thread_offline(); | |
121a5d44 | 332 | rcu_unregister_thread(); |
8a953620 MD |
333 | |
334 | return (NULL); | |
335 | } | |
336 | ||
b57aee66 PM |
337 | static pthread_mutex_t call_rcu_test_mutex = PTHREAD_MUTEX_INITIALIZER; |
338 | static pthread_cond_t call_rcu_test_cond = PTHREAD_COND_INITIALIZER; | |
a6ca497d | 339 | static bool call_rcu_wait; |
b57aee66 | 340 | |
61c3fb60 | 341 | static |
70469b43 | 342 | void rcu_update_stress_test_rcu(struct rcu_head *head __attribute__((unused))) |
b57aee66 | 343 | { |
ad460058 MD |
344 | int ret; |
345 | ||
346 | ret = pthread_mutex_lock(&call_rcu_test_mutex); | |
347 | if (ret) { | |
348 | errno = ret; | |
349 | diag("pthread_mutex_lock: %s", | |
350 | strerror(errno)); | |
351 | abort(); | |
b57aee66 | 352 | } |
ad460058 MD |
353 | ret = pthread_cond_signal(&call_rcu_test_cond); |
354 | if (ret) { | |
355 | errno = ret; | |
356 | diag("pthread_cond_signal: %s", | |
357 | strerror(errno)); | |
358 | abort(); | |
b57aee66 | 359 | } |
a6ca497d | 360 | call_rcu_wait = false; |
ad460058 MD |
361 | ret = pthread_mutex_unlock(&call_rcu_test_mutex); |
362 | if (ret) { | |
363 | errno = ret; | |
364 | diag("pthread_mutex_unlock: %s", | |
365 | strerror(errno)); | |
366 | abort(); | |
b57aee66 PM |
367 | } |
368 | } | |
369 | ||
eb218d4f MD |
370 | static |
371 | void advance_writer_state(enum writer_state *state) | |
372 | { | |
373 | switch (*state) { | |
374 | case WRITER_STATE_SYNC_RCU: | |
375 | *state = WRITER_STATE_CALL_RCU; | |
376 | break; | |
377 | case WRITER_STATE_CALL_RCU: | |
378 | *state = WRITER_STATE_POLL_RCU; | |
379 | break; | |
380 | case WRITER_STATE_POLL_RCU: | |
381 | *state = WRITER_STATE_SYNC_RCU; | |
382 | break; | |
383 | } | |
384 | } | |
385 | ||
61c3fb60 | 386 | static |
70469b43 | 387 | void *rcu_update_stress_test(void *arg __attribute__((unused))) |
8a953620 MD |
388 | { |
389 | int i; | |
390 | struct rcu_stress *p; | |
b57aee66 | 391 | struct rcu_head rh; |
eb218d4f | 392 | enum writer_state writer_state = WRITER_STATE_SYNC_RCU; |
8a953620 | 393 | |
b21d2eb5 OD |
394 | rcu_register_thread(); |
395 | ||
396 | /* Offline for poll. */ | |
397 | put_thread_offline(); | |
8a953620 | 398 | while (goflag == GOFLAG_INIT) |
775aff2e | 399 | (void) poll(NULL, 0, 1); |
b21d2eb5 OD |
400 | put_thread_online(); |
401 | ||
8a953620 MD |
402 | while (goflag == GOFLAG_RUN) { |
403 | i = rcu_stress_idx + 1; | |
404 | if (i >= RCU_STRESS_PIPE_LEN) | |
405 | i = 0; | |
406 | p = &rcu_stress_array[i]; | |
407 | p->mbtest = 0; | |
5481ddb3 | 408 | cmm_smp_mb(); |
8a953620 MD |
409 | p->pipe_count = 0; |
410 | p->mbtest = 1; | |
411 | rcu_assign_pointer(rcu_stress_current, p); | |
412 | rcu_stress_idx = i; | |
413 | for (i = 0; i < RCU_STRESS_PIPE_LEN; i++) | |
414 | if (i != rcu_stress_idx) | |
415 | rcu_stress_array[i].pipe_count++; | |
eb218d4f MD |
416 | switch (writer_state) { |
417 | case WRITER_STATE_SYNC_RCU: | |
b57aee66 | 418 | synchronize_rcu(); |
eb218d4f MD |
419 | break; |
420 | case WRITER_STATE_CALL_RCU: | |
421 | { | |
ad460058 MD |
422 | int ret; |
423 | ||
424 | ret = pthread_mutex_lock(&call_rcu_test_mutex); | |
425 | if (ret) { | |
426 | errno = ret; | |
427 | diag("pthread_mutex_lock: %s", | |
428 | strerror(errno)); | |
429 | abort(); | |
b57aee66 PM |
430 | } |
431 | call_rcu(&rh, rcu_update_stress_test_rcu); | |
b21d2eb5 | 432 | |
0b9c513b MD |
433 | /* |
434 | * Our MacOS X test machine with the following | |
435 | * config: | |
436 | * 15.6.0 Darwin Kernel Version 15.6.0 | |
437 | * root:xnu-3248.60.10~1/RELEASE_X86_64 | |
438 | * appears to have issues with liburcu-signal | |
439 | * signal being delivered on top of | |
440 | * pthread_cond_wait. It seems to make the | |
441 | * thread continue, and therefore corrupt the | |
442 | * rcu_head. Work around this issue by | |
443 | * unregistering the RCU read-side thread | |
444 | * immediately after call_rcu (call_rcu needs | |
445 | * us to be registered RCU readers). | |
446 | */ | |
a6ca497d | 447 | call_rcu_wait = true; |
b21d2eb5 OD |
448 | /* Offline for pthread_cond_wait. */ |
449 | put_thread_offline(); | |
a6ca497d OD |
450 | do { |
451 | ret = pthread_cond_wait(&call_rcu_test_cond, | |
452 | &call_rcu_test_mutex); | |
453 | } while (call_rcu_wait); | |
b21d2eb5 | 454 | put_thread_online(); |
ad460058 MD |
455 | if (ret) { |
456 | errno = ret; | |
457 | diag("pthread_cond_signal: %s", | |
458 | strerror(errno)); | |
459 | abort(); | |
b57aee66 | 460 | } |
ad460058 MD |
461 | ret = pthread_mutex_unlock(&call_rcu_test_mutex); |
462 | if (ret) { | |
463 | errno = ret; | |
464 | diag("pthread_mutex_unlock: %s", | |
465 | strerror(errno)); | |
466 | abort(); | |
b57aee66 | 467 | } |
eb218d4f MD |
468 | break; |
469 | } | |
470 | case WRITER_STATE_POLL_RCU: | |
471 | { | |
472 | struct urcu_gp_poll_state poll_state; | |
473 | ||
eb218d4f | 474 | poll_state = start_poll_synchronize_rcu(); |
b21d2eb5 OD |
475 | |
476 | /* Offline for poll. */ | |
477 | put_thread_offline(); | |
eb218d4f MD |
478 | while (!poll_state_synchronize_rcu(poll_state)) |
479 | (void) poll(NULL, 0, 1); /* Wait for 1ms */ | |
b21d2eb5 | 480 | put_thread_online(); |
eb218d4f MD |
481 | break; |
482 | } | |
b57aee66 | 483 | } |
8a953620 | 484 | n_updates++; |
eb218d4f | 485 | advance_writer_state(&writer_state); |
8a953620 | 486 | } |
a13ef613 | 487 | |
b21d2eb5 OD |
488 | rcu_unregister_thread(); |
489 | ||
b0b31506 | 490 | return NULL; |
8a953620 MD |
491 | } |
492 | ||
61c3fb60 | 493 | static |
70469b43 | 494 | void *rcu_fake_update_stress_test(void *arg __attribute__((unused))) |
8a953620 | 495 | { |
26b5a74b | 496 | if (callrcu_type == CALLRCU_PERTHREAD) { |
b57aee66 PM |
497 | struct call_rcu_data *crdp; |
498 | ||
c1d2c60b | 499 | crdp = create_call_rcu_data(0, -1); |
b57aee66 | 500 | if (crdp != NULL) { |
26b5a74b | 501 | diag("Successfully using per-thread call_rcu() worker."); |
b57aee66 PM |
502 | set_thread_call_rcu_data(crdp); |
503 | } | |
504 | } | |
8a953620 | 505 | while (goflag == GOFLAG_INIT) |
775aff2e | 506 | (void) poll(NULL, 0, 1); |
8a953620 MD |
507 | while (goflag == GOFLAG_RUN) { |
508 | synchronize_rcu(); | |
775aff2e | 509 | (void) poll(NULL, 0, 1); |
8a953620 | 510 | } |
26b5a74b MD |
511 | if (callrcu_type == CALLRCU_PERTHREAD) { |
512 | struct call_rcu_data *crdp; | |
513 | ||
514 | crdp = get_thread_call_rcu_data(); | |
515 | set_thread_call_rcu_data(NULL); | |
516 | call_rcu_data_free(crdp); | |
517 | } | |
b0b31506 | 518 | return NULL; |
8a953620 MD |
519 | } |
520 | ||
61c3fb60 | 521 | static |
ad460058 | 522 | int stresstest(int nreaders) |
8a953620 MD |
523 | { |
524 | int i; | |
525 | int t; | |
526 | long long *p; | |
527 | long long sum; | |
528 | ||
529 | init_per_thread(n_reads_pt, 0LL); | |
530 | for_each_thread(t) { | |
531 | p = &per_thread(rcu_stress_count,t)[0]; | |
532 | for (i = 0; i <= RCU_STRESS_PIPE_LEN; i++) | |
533 | p[i] = 0LL; | |
534 | } | |
535 | rcu_stress_current = &rcu_stress_array[0]; | |
536 | rcu_stress_current->pipe_count = 0; | |
537 | rcu_stress_current->mbtest = 1; | |
538 | for (i = 0; i < nreaders; i++) | |
539 | create_thread(rcu_read_stress_test, NULL); | |
540 | create_thread(rcu_update_stress_test, NULL); | |
541 | for (i = 0; i < 5; i++) | |
542 | create_thread(rcu_fake_update_stress_test, NULL); | |
5481ddb3 | 543 | cmm_smp_mb(); |
8a953620 | 544 | goflag = GOFLAG_RUN; |
5481ddb3 | 545 | cmm_smp_mb(); |
8a953620 | 546 | sleep(10); |
5481ddb3 | 547 | cmm_smp_mb(); |
8a953620 | 548 | goflag = GOFLAG_STOP; |
5481ddb3 | 549 | cmm_smp_mb(); |
8a953620 MD |
550 | wait_all_threads(); |
551 | for_each_thread(t) | |
552 | n_reads += per_thread(n_reads_pt, t); | |
ad460058 | 553 | diag("n_reads: %lld n_updates: %ld n_mberror: %d", |
8a953620 | 554 | n_reads, n_updates, n_mberror); |
ad460058 MD |
555 | rdiag_start(); |
556 | rdiag("rcu_stress_count:"); | |
8a953620 MD |
557 | for (i = 0; i <= RCU_STRESS_PIPE_LEN; i++) { |
558 | sum = 0LL; | |
559 | for_each_thread(t) { | |
560 | sum += per_thread(rcu_stress_count, t)[i]; | |
561 | } | |
ad460058 | 562 | rdiag(" %lld", sum); |
8a953620 | 563 | } |
ad460058 | 564 | rdiag_end(); |
7106ddf8 | 565 | if (get_cpu_call_rcu_data(0)) { |
ad460058 | 566 | diag("Deallocating per-CPU call_rcu threads."); |
7106ddf8 PM |
567 | free_all_cpu_call_rcu_data(); |
568 | } | |
ad460058 MD |
569 | if (!n_mberror) |
570 | return 0; | |
571 | else | |
572 | return -1; | |
8a953620 MD |
573 | } |
574 | ||
575 | /* | |
576 | * Mainprogram. | |
577 | */ | |
578 | ||
a142df4e | 579 | static |
6fa8b4f8 | 580 | void usage(char *argv[]) __attribute__((__noreturn__)); |
a142df4e | 581 | |
61c3fb60 | 582 | static |
70469b43 | 583 | void usage(char *argv[]) |
8a953620 | 584 | { |
26b5a74b | 585 | diag("Usage: %s nreaders [ perf | rperf | uperf | stress ] [ stride ] [ callrcu_global | callrcu_percpu | callrcu_perthread ]\n", argv[0]); |
8a953620 MD |
586 | exit(-1); |
587 | } | |
588 | ||
589 | int main(int argc, char *argv[]) | |
590 | { | |
591 | int nreaders = 1; | |
592 | int cpustride = 1; | |
593 | ||
ad460058 MD |
594 | plan_tests(NR_TESTS); |
595 | ||
8a953620 MD |
596 | smp_init(); |
597 | //rcu_init(); | |
26b5a74b MD |
598 | if (argc > 4) { |
599 | const char *callrcu_str = argv[4];; | |
600 | ||
601 | if (strcmp(callrcu_str, "callrcu_global") == 0) { | |
602 | callrcu_type = CALLRCU_GLOBAL; | |
603 | } else if (strcmp(callrcu_str, "callrcu_percpu") == 0) { | |
604 | callrcu_type = CALLRCU_PERCPU; | |
605 | } else if (strcmp(callrcu_str, "callrcu_perthread") == 0) { | |
606 | callrcu_type = CALLRCU_PERTHREAD; | |
607 | } else { | |
70469b43 | 608 | usage(argv); |
26b5a74b MD |
609 | goto end; |
610 | } | |
611 | } | |
929cfaff | 612 | |
26b5a74b MD |
613 | switch (callrcu_type) { |
614 | case CALLRCU_GLOBAL: | |
615 | diag("Using global per-process call_rcu thread."); | |
616 | break; | |
617 | case CALLRCU_PERCPU: | |
618 | diag("Using per-CPU call_rcu threads."); | |
b57aee66 | 619 | if (create_all_cpu_call_rcu_data(0)) |
ad460058 MD |
620 | diag("create_all_cpu_call_rcu_data: %s", |
621 | strerror(errno)); | |
26b5a74b MD |
622 | break; |
623 | case CALLRCU_PERTHREAD: | |
624 | diag("Using per-thread call_rcu() worker."); | |
625 | break; | |
626 | default: | |
627 | abort(); | |
b57aee66 | 628 | } |
8a953620 | 629 | |
9b171f46 MD |
630 | #ifdef DEBUG_YIELD |
631 | yield_active |= YIELD_READ; | |
632 | yield_active |= YIELD_WRITE; | |
633 | #endif | |
634 | ||
8a953620 | 635 | if (argc > 1) { |
26b5a74b MD |
636 | if (strcmp(argv[1], "-h") == 0 |
637 | || strcmp(argv[1], "--help") == 0) { | |
70469b43 | 638 | usage(argv); |
26b5a74b MD |
639 | goto end; |
640 | } | |
8a953620 | 641 | nreaders = strtoul(argv[1], NULL, 0); |
ad460058 MD |
642 | if (argc == 2) { |
643 | ok(!perftest(nreaders, cpustride), | |
644 | "perftest readers: %d, stride: %d", | |
645 | nreaders, cpustride); | |
646 | goto end; | |
647 | } | |
8a953620 MD |
648 | if (argc > 3) |
649 | cpustride = strtoul(argv[3], NULL, 0); | |
650 | if (strcmp(argv[2], "perf") == 0) | |
ad460058 MD |
651 | ok(!perftest(nreaders, cpustride), |
652 | "perftest readers: %d, stride: %d", | |
653 | nreaders, cpustride); | |
8a953620 | 654 | else if (strcmp(argv[2], "rperf") == 0) |
ad460058 MD |
655 | ok(!rperftest(nreaders, cpustride), |
656 | "rperftest readers: %d, stride: %d", | |
657 | nreaders, cpustride); | |
8a953620 | 658 | else if (strcmp(argv[2], "uperf") == 0) |
ad460058 MD |
659 | ok(!uperftest(nreaders, cpustride), |
660 | "uperftest readers: %d, stride: %d", | |
661 | nreaders, cpustride); | |
8a953620 | 662 | else if (strcmp(argv[2], "stress") == 0) |
ad460058 MD |
663 | ok(!stresstest(nreaders), |
664 | "stresstest readers: %d, stride: %d", | |
665 | nreaders, cpustride); | |
666 | else | |
70469b43 | 667 | usage(argv); |
ad460058 | 668 | } else { |
70469b43 | 669 | usage(argv); |
8a953620 | 670 | } |
ad460058 MD |
671 | end: |
672 | return exit_status(); | |
8a953620 | 673 | } |