| 1 | /* |
| 2 | * rcutorture.h: simple user-level performance/stress test of RCU. |
| 3 | * |
| 4 | * Usage: |
| 5 | * ./rcu <nreaders> rperf [ <cpustride> ] |
| 6 | * Run a read-side performance test with the specified |
| 7 | * number of readers spaced by <cpustride>. |
| 8 | * Thus "./rcu 16 rperf 2" would run 16 readers on even-numbered |
| 9 | * CPUs from 0 to 30. |
| 10 | * ./rcu <nupdaters> uperf [ <cpustride> ] |
| 11 | * Run an update-side performance test with the specified |
| 12 | * number of updaters and specified CPU spacing. |
| 13 | * ./rcu <nreaders> perf [ <cpustride> ] |
| 14 | * Run a combined read/update performance test with the specified |
| 15 | * number of readers and one updater and specified CPU spacing. |
| 16 | * The readers run on the low-numbered CPUs and the updater |
| 17 | * of the highest-numbered CPU. |
| 18 | * |
| 19 | * The above tests produce output as follows: |
| 20 | * |
| 21 | * n_reads: 46008000 n_updates: 146026 nreaders: 2 nupdaters: 1 duration: 1 |
| 22 | * ns/read: 43.4707 ns/update: 6848.1 |
| 23 | * |
| 24 | * The first line lists the total number of RCU reads and updates executed |
| 25 | * during the test, the number of reader threads, the number of updater |
| 26 | * threads, and the duration of the test in seconds. The second line |
| 27 | * lists the average duration of each type of operation in nanoseconds, |
| 28 | * or "nan" if the corresponding type of operation was not performed. |
| 29 | * |
| 30 | * ./rcu <nreaders> stress |
| 31 | * Run a stress test with the specified number of readers and |
| 32 | * one updater. None of the threads are affinitied to any |
| 33 | * particular CPU. |
| 34 | * |
| 35 | * This test produces output as follows: |
| 36 | * |
| 37 | * n_reads: 114633217 n_updates: 3903415 n_mberror: 0 |
| 38 | * rcu_stress_count: 114618391 14826 0 0 0 0 0 0 0 0 0 |
| 39 | * |
| 40 | * The first line lists the number of RCU read and update operations |
| 41 | * executed, followed by the number of memory-ordering violations |
| 42 | * (which will be zero in a correct RCU implementation). The second |
| 43 | * line lists the number of readers observing progressively more stale |
| 44 | * data. A correct RCU implementation will have all but the first two |
| 45 | * numbers non-zero. |
| 46 | * |
| 47 | * This program is free software; you can redistribute it and/or modify |
| 48 | * it under the terms of the GNU General Public License as published by |
| 49 | * the Free Software Foundation; either version 2 of the License, or |
| 50 | * (at your option) any later version. |
| 51 | * |
| 52 | * This program is distributed in the hope that it will be useful, |
| 53 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 54 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 55 | * GNU General Public License for more details. |
| 56 | * |
| 57 | * You should have received a copy of the GNU General Public License |
| 58 | * along with this program; if not, write to the Free Software |
| 59 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 60 | * |
| 61 | * Copyright (c) 2008 Paul E. McKenney, IBM Corporation. |
| 62 | */ |
| 63 | |
| 64 | /* |
| 65 | * Test variables. |
| 66 | */ |
| 67 | |
| 68 | #include <stdlib.h> |
| 69 | #include "tap.h" |
| 70 | |
| 71 | #define NR_TESTS 1 |
| 72 | |
| 73 | DEFINE_PER_THREAD(long long, n_reads_pt); |
| 74 | DEFINE_PER_THREAD(long long, n_updates_pt); |
| 75 | |
| 76 | enum callrcu_type { |
| 77 | CALLRCU_GLOBAL, |
| 78 | CALLRCU_PERCPU, |
| 79 | CALLRCU_PERTHREAD, |
| 80 | }; |
| 81 | |
| 82 | enum writer_state { |
| 83 | WRITER_STATE_SYNC_RCU, |
| 84 | WRITER_STATE_CALL_RCU, |
| 85 | WRITER_STATE_POLL_RCU, |
| 86 | }; |
| 87 | |
| 88 | static enum callrcu_type callrcu_type = CALLRCU_GLOBAL; |
| 89 | |
| 90 | long long n_reads = 0LL; |
| 91 | long n_updates = 0L; |
| 92 | int nthreadsrunning; |
| 93 | char argsbuf[64]; |
| 94 | |
| 95 | #define GOFLAG_INIT 0 |
| 96 | #define GOFLAG_RUN 1 |
| 97 | #define GOFLAG_STOP 2 |
| 98 | |
| 99 | volatile int goflag __attribute__((__aligned__(CAA_CACHE_LINE_SIZE))) |
| 100 | = GOFLAG_INIT; |
| 101 | |
| 102 | #define RCU_READ_RUN 1000 |
| 103 | |
| 104 | //MD |
| 105 | #define RCU_READ_NESTABLE |
| 106 | |
| 107 | #ifdef RCU_READ_NESTABLE |
| 108 | #define rcu_read_lock_nest() rcu_read_lock() |
| 109 | #define rcu_read_unlock_nest() rcu_read_unlock() |
| 110 | #else /* #ifdef RCU_READ_NESTABLE */ |
| 111 | #define rcu_read_lock_nest() |
| 112 | #define rcu_read_unlock_nest() |
| 113 | #endif /* #else #ifdef RCU_READ_NESTABLE */ |
| 114 | |
| 115 | #ifdef TORTURE_QSBR |
| 116 | #define mark_rcu_quiescent_state rcu_quiescent_state |
| 117 | #define put_thread_offline rcu_thread_offline |
| 118 | #define put_thread_online rcu_thread_online |
| 119 | #endif |
| 120 | |
| 121 | #ifndef mark_rcu_quiescent_state |
| 122 | #define mark_rcu_quiescent_state() do {} while (0) |
| 123 | #endif /* #ifdef mark_rcu_quiescent_state */ |
| 124 | |
| 125 | #ifndef put_thread_offline |
| 126 | #define put_thread_offline() do {} while (0) |
| 127 | #define put_thread_online() do {} while (0) |
| 128 | #define put_thread_online_delay() do {} while (0) |
| 129 | #else /* #ifndef put_thread_offline */ |
| 130 | #define put_thread_online_delay() synchronize_rcu() |
| 131 | #endif /* #else #ifndef put_thread_offline */ |
| 132 | |
| 133 | /* |
| 134 | * Performance test. |
| 135 | */ |
| 136 | |
| 137 | static |
| 138 | void *rcu_read_perf_test(void *arg) |
| 139 | { |
| 140 | int i; |
| 141 | int me = (long)arg; |
| 142 | long long n_reads_local = 0; |
| 143 | |
| 144 | rcu_register_thread(); |
| 145 | run_on(me); |
| 146 | uatomic_inc(&nthreadsrunning); |
| 147 | put_thread_offline(); |
| 148 | while (goflag == GOFLAG_INIT) |
| 149 | (void) poll(NULL, 0, 1); |
| 150 | put_thread_online(); |
| 151 | while (goflag == GOFLAG_RUN) { |
| 152 | for (i = 0; i < RCU_READ_RUN; i++) { |
| 153 | rcu_read_lock(); |
| 154 | /* rcu_read_lock_nest(); */ |
| 155 | /* rcu_read_unlock_nest(); */ |
| 156 | rcu_read_unlock(); |
| 157 | } |
| 158 | n_reads_local += RCU_READ_RUN; |
| 159 | mark_rcu_quiescent_state(); |
| 160 | } |
| 161 | __get_thread_var(n_reads_pt) += n_reads_local; |
| 162 | put_thread_offline(); |
| 163 | rcu_unregister_thread(); |
| 164 | |
| 165 | return (NULL); |
| 166 | } |
| 167 | |
| 168 | static |
| 169 | void *rcu_update_perf_test(void *arg __attribute__((unused))) |
| 170 | { |
| 171 | long long n_updates_local = 0; |
| 172 | |
| 173 | if (callrcu_type == CALLRCU_PERTHREAD) { |
| 174 | struct call_rcu_data *crdp; |
| 175 | |
| 176 | crdp = create_call_rcu_data(0, -1); |
| 177 | if (crdp != NULL) { |
| 178 | diag("Successfully using per-thread call_rcu() worker."); |
| 179 | set_thread_call_rcu_data(crdp); |
| 180 | } |
| 181 | } |
| 182 | uatomic_inc(&nthreadsrunning); |
| 183 | while (goflag == GOFLAG_INIT) |
| 184 | (void) poll(NULL, 0, 1); |
| 185 | while (goflag == GOFLAG_RUN) { |
| 186 | synchronize_rcu(); |
| 187 | n_updates_local++; |
| 188 | } |
| 189 | __get_thread_var(n_updates_pt) += n_updates_local; |
| 190 | if (callrcu_type == CALLRCU_PERTHREAD) { |
| 191 | struct call_rcu_data *crdp; |
| 192 | |
| 193 | crdp = get_thread_call_rcu_data(); |
| 194 | set_thread_call_rcu_data(NULL); |
| 195 | call_rcu_data_free(crdp); |
| 196 | } |
| 197 | return NULL; |
| 198 | } |
| 199 | |
| 200 | static |
| 201 | void perftestinit(void) |
| 202 | { |
| 203 | init_per_thread(n_reads_pt, 0LL); |
| 204 | init_per_thread(n_updates_pt, 0LL); |
| 205 | uatomic_set(&nthreadsrunning, 0); |
| 206 | } |
| 207 | |
| 208 | static |
| 209 | int perftestrun(int nthreads, int nreaders, int nupdaters) |
| 210 | { |
| 211 | int t; |
| 212 | int duration = 1; |
| 213 | |
| 214 | cmm_smp_mb(); |
| 215 | while (uatomic_read(&nthreadsrunning) < nthreads) |
| 216 | (void) poll(NULL, 0, 1); |
| 217 | goflag = GOFLAG_RUN; |
| 218 | cmm_smp_mb(); |
| 219 | sleep(duration); |
| 220 | cmm_smp_mb(); |
| 221 | goflag = GOFLAG_STOP; |
| 222 | cmm_smp_mb(); |
| 223 | wait_all_threads(); |
| 224 | for_each_thread(t) { |
| 225 | n_reads += per_thread(n_reads_pt, t); |
| 226 | n_updates += per_thread(n_updates_pt, t); |
| 227 | } |
| 228 | diag("n_reads: %lld n_updates: %ld nreaders: %d nupdaters: %d duration: %d", |
| 229 | n_reads, n_updates, nreaders, nupdaters, duration); |
| 230 | diag("ns/read: %g ns/update: %g", |
| 231 | ((duration * 1000*1000*1000.*(double)nreaders) / |
| 232 | (double)n_reads), |
| 233 | ((duration * 1000*1000*1000.*(double)nupdaters) / |
| 234 | (double)n_updates)); |
| 235 | if (get_cpu_call_rcu_data(0)) { |
| 236 | diag("Deallocating per-CPU call_rcu threads.\n"); |
| 237 | free_all_cpu_call_rcu_data(); |
| 238 | } |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static |
| 243 | int perftest(int nreaders, int cpustride) |
| 244 | { |
| 245 | int i; |
| 246 | long arg; |
| 247 | |
| 248 | perftestinit(); |
| 249 | for (i = 0; i < nreaders; i++) { |
| 250 | arg = (long)(i * cpustride); |
| 251 | create_thread(rcu_read_perf_test, (void *)arg); |
| 252 | } |
| 253 | arg = (long)(i * cpustride); |
| 254 | create_thread(rcu_update_perf_test, (void *)arg); |
| 255 | return perftestrun(i + 1, nreaders, 1); |
| 256 | } |
| 257 | |
| 258 | static |
| 259 | int rperftest(int nreaders, int cpustride) |
| 260 | { |
| 261 | int i; |
| 262 | long arg; |
| 263 | |
| 264 | perftestinit(); |
| 265 | init_per_thread(n_reads_pt, 0LL); |
| 266 | for (i = 0; i < nreaders; i++) { |
| 267 | arg = (long)(i * cpustride); |
| 268 | create_thread(rcu_read_perf_test, (void *)arg); |
| 269 | } |
| 270 | return perftestrun(i, nreaders, 0); |
| 271 | } |
| 272 | |
| 273 | static |
| 274 | int uperftest(int nupdaters, int cpustride) |
| 275 | { |
| 276 | int i; |
| 277 | long arg; |
| 278 | |
| 279 | perftestinit(); |
| 280 | init_per_thread(n_reads_pt, 0LL); |
| 281 | for (i = 0; i < nupdaters; i++) { |
| 282 | arg = (long)(i * cpustride); |
| 283 | create_thread(rcu_update_perf_test, (void *)arg); |
| 284 | } |
| 285 | return perftestrun(i, 0, nupdaters); |
| 286 | } |
| 287 | |
| 288 | /* |
| 289 | * Stress test. |
| 290 | */ |
| 291 | |
| 292 | #define RCU_STRESS_PIPE_LEN 10 |
| 293 | |
| 294 | struct rcu_stress { |
| 295 | int pipe_count; |
| 296 | int mbtest; |
| 297 | }; |
| 298 | |
| 299 | struct rcu_stress rcu_stress_array[RCU_STRESS_PIPE_LEN] = { { 0, 0 } }; |
| 300 | struct rcu_stress *rcu_stress_current; |
| 301 | int rcu_stress_idx = 0; |
| 302 | |
| 303 | int n_mberror = 0; |
| 304 | DEFINE_PER_THREAD(long long [RCU_STRESS_PIPE_LEN + 1], rcu_stress_count); |
| 305 | |
| 306 | int garbage = 0; |
| 307 | |
| 308 | static |
| 309 | void *rcu_read_stress_test(void *arg __attribute__((unused))) |
| 310 | { |
| 311 | int i; |
| 312 | int itercnt = 0; |
| 313 | struct rcu_stress *p; |
| 314 | int pc; |
| 315 | |
| 316 | rcu_register_thread(); |
| 317 | put_thread_offline(); |
| 318 | while (goflag == GOFLAG_INIT) |
| 319 | (void) poll(NULL, 0, 1); |
| 320 | put_thread_online(); |
| 321 | while (goflag == GOFLAG_RUN) { |
| 322 | rcu_read_lock(); |
| 323 | p = rcu_dereference(rcu_stress_current); |
| 324 | if (p->mbtest == 0) |
| 325 | n_mberror++; |
| 326 | rcu_read_lock_nest(); |
| 327 | for (i = 0; i < 100; i++) |
| 328 | garbage++; |
| 329 | rcu_read_unlock_nest(); |
| 330 | pc = p->pipe_count; |
| 331 | rcu_read_unlock(); |
| 332 | if ((pc > RCU_STRESS_PIPE_LEN) || (pc < 0)) |
| 333 | pc = RCU_STRESS_PIPE_LEN; |
| 334 | __get_thread_var(rcu_stress_count)[pc]++; |
| 335 | __get_thread_var(n_reads_pt)++; |
| 336 | mark_rcu_quiescent_state(); |
| 337 | if ((++itercnt % 0x1000) == 0) { |
| 338 | put_thread_offline(); |
| 339 | put_thread_online_delay(); |
| 340 | put_thread_online(); |
| 341 | } |
| 342 | } |
| 343 | put_thread_offline(); |
| 344 | rcu_unregister_thread(); |
| 345 | |
| 346 | return (NULL); |
| 347 | } |
| 348 | |
| 349 | static pthread_mutex_t call_rcu_test_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 350 | static pthread_cond_t call_rcu_test_cond = PTHREAD_COND_INITIALIZER; |
| 351 | static bool call_rcu_wait; |
| 352 | |
| 353 | static |
| 354 | void rcu_update_stress_test_rcu(struct rcu_head *head __attribute__((unused))) |
| 355 | { |
| 356 | int ret; |
| 357 | |
| 358 | ret = pthread_mutex_lock(&call_rcu_test_mutex); |
| 359 | if (ret) { |
| 360 | errno = ret; |
| 361 | diag("pthread_mutex_lock: %s", |
| 362 | strerror(errno)); |
| 363 | abort(); |
| 364 | } |
| 365 | ret = pthread_cond_signal(&call_rcu_test_cond); |
| 366 | if (ret) { |
| 367 | errno = ret; |
| 368 | diag("pthread_cond_signal: %s", |
| 369 | strerror(errno)); |
| 370 | abort(); |
| 371 | } |
| 372 | call_rcu_wait = false; |
| 373 | ret = pthread_mutex_unlock(&call_rcu_test_mutex); |
| 374 | if (ret) { |
| 375 | errno = ret; |
| 376 | diag("pthread_mutex_unlock: %s", |
| 377 | strerror(errno)); |
| 378 | abort(); |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | static |
| 383 | void advance_writer_state(enum writer_state *state) |
| 384 | { |
| 385 | switch (*state) { |
| 386 | case WRITER_STATE_SYNC_RCU: |
| 387 | *state = WRITER_STATE_CALL_RCU; |
| 388 | break; |
| 389 | case WRITER_STATE_CALL_RCU: |
| 390 | *state = WRITER_STATE_POLL_RCU; |
| 391 | break; |
| 392 | case WRITER_STATE_POLL_RCU: |
| 393 | *state = WRITER_STATE_SYNC_RCU; |
| 394 | break; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | static |
| 399 | void *rcu_update_stress_test(void *arg __attribute__((unused))) |
| 400 | { |
| 401 | int i; |
| 402 | struct rcu_stress *p; |
| 403 | struct rcu_head rh; |
| 404 | enum writer_state writer_state = WRITER_STATE_SYNC_RCU; |
| 405 | |
| 406 | while (goflag == GOFLAG_INIT) |
| 407 | (void) poll(NULL, 0, 1); |
| 408 | while (goflag == GOFLAG_RUN) { |
| 409 | i = rcu_stress_idx + 1; |
| 410 | if (i >= RCU_STRESS_PIPE_LEN) |
| 411 | i = 0; |
| 412 | p = &rcu_stress_array[i]; |
| 413 | p->mbtest = 0; |
| 414 | cmm_smp_mb(); |
| 415 | p->pipe_count = 0; |
| 416 | p->mbtest = 1; |
| 417 | rcu_assign_pointer(rcu_stress_current, p); |
| 418 | rcu_stress_idx = i; |
| 419 | for (i = 0; i < RCU_STRESS_PIPE_LEN; i++) |
| 420 | if (i != rcu_stress_idx) |
| 421 | rcu_stress_array[i].pipe_count++; |
| 422 | switch (writer_state) { |
| 423 | case WRITER_STATE_SYNC_RCU: |
| 424 | synchronize_rcu(); |
| 425 | break; |
| 426 | case WRITER_STATE_CALL_RCU: |
| 427 | { |
| 428 | int ret; |
| 429 | |
| 430 | ret = pthread_mutex_lock(&call_rcu_test_mutex); |
| 431 | if (ret) { |
| 432 | errno = ret; |
| 433 | diag("pthread_mutex_lock: %s", |
| 434 | strerror(errno)); |
| 435 | abort(); |
| 436 | } |
| 437 | rcu_register_thread(); |
| 438 | call_rcu(&rh, rcu_update_stress_test_rcu); |
| 439 | rcu_unregister_thread(); |
| 440 | /* |
| 441 | * Our MacOS X test machine with the following |
| 442 | * config: |
| 443 | * 15.6.0 Darwin Kernel Version 15.6.0 |
| 444 | * root:xnu-3248.60.10~1/RELEASE_X86_64 |
| 445 | * appears to have issues with liburcu-signal |
| 446 | * signal being delivered on top of |
| 447 | * pthread_cond_wait. It seems to make the |
| 448 | * thread continue, and therefore corrupt the |
| 449 | * rcu_head. Work around this issue by |
| 450 | * unregistering the RCU read-side thread |
| 451 | * immediately after call_rcu (call_rcu needs |
| 452 | * us to be registered RCU readers). |
| 453 | */ |
| 454 | call_rcu_wait = true; |
| 455 | do { |
| 456 | ret = pthread_cond_wait(&call_rcu_test_cond, |
| 457 | &call_rcu_test_mutex); |
| 458 | } while (call_rcu_wait); |
| 459 | if (ret) { |
| 460 | errno = ret; |
| 461 | diag("pthread_cond_signal: %s", |
| 462 | strerror(errno)); |
| 463 | abort(); |
| 464 | } |
| 465 | ret = pthread_mutex_unlock(&call_rcu_test_mutex); |
| 466 | if (ret) { |
| 467 | errno = ret; |
| 468 | diag("pthread_mutex_unlock: %s", |
| 469 | strerror(errno)); |
| 470 | abort(); |
| 471 | } |
| 472 | break; |
| 473 | } |
| 474 | case WRITER_STATE_POLL_RCU: |
| 475 | { |
| 476 | struct urcu_gp_poll_state poll_state; |
| 477 | |
| 478 | rcu_register_thread(); |
| 479 | poll_state = start_poll_synchronize_rcu(); |
| 480 | rcu_unregister_thread(); |
| 481 | while (!poll_state_synchronize_rcu(poll_state)) |
| 482 | (void) poll(NULL, 0, 1); /* Wait for 1ms */ |
| 483 | break; |
| 484 | } |
| 485 | } |
| 486 | n_updates++; |
| 487 | advance_writer_state(&writer_state); |
| 488 | } |
| 489 | |
| 490 | return NULL; |
| 491 | } |
| 492 | |
| 493 | static |
| 494 | void *rcu_fake_update_stress_test(void *arg __attribute__((unused))) |
| 495 | { |
| 496 | if (callrcu_type == CALLRCU_PERTHREAD) { |
| 497 | struct call_rcu_data *crdp; |
| 498 | |
| 499 | crdp = create_call_rcu_data(0, -1); |
| 500 | if (crdp != NULL) { |
| 501 | diag("Successfully using per-thread call_rcu() worker."); |
| 502 | set_thread_call_rcu_data(crdp); |
| 503 | } |
| 504 | } |
| 505 | while (goflag == GOFLAG_INIT) |
| 506 | (void) poll(NULL, 0, 1); |
| 507 | while (goflag == GOFLAG_RUN) { |
| 508 | synchronize_rcu(); |
| 509 | (void) poll(NULL, 0, 1); |
| 510 | } |
| 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 | } |
| 518 | return NULL; |
| 519 | } |
| 520 | |
| 521 | static |
| 522 | int stresstest(int nreaders) |
| 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); |
| 543 | cmm_smp_mb(); |
| 544 | goflag = GOFLAG_RUN; |
| 545 | cmm_smp_mb(); |
| 546 | sleep(10); |
| 547 | cmm_smp_mb(); |
| 548 | goflag = GOFLAG_STOP; |
| 549 | cmm_smp_mb(); |
| 550 | wait_all_threads(); |
| 551 | for_each_thread(t) |
| 552 | n_reads += per_thread(n_reads_pt, t); |
| 553 | diag("n_reads: %lld n_updates: %ld n_mberror: %d", |
| 554 | n_reads, n_updates, n_mberror); |
| 555 | rdiag_start(); |
| 556 | rdiag("rcu_stress_count:"); |
| 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 | } |
| 562 | rdiag(" %lld", sum); |
| 563 | } |
| 564 | rdiag_end(); |
| 565 | if (get_cpu_call_rcu_data(0)) { |
| 566 | diag("Deallocating per-CPU call_rcu threads."); |
| 567 | free_all_cpu_call_rcu_data(); |
| 568 | } |
| 569 | if (!n_mberror) |
| 570 | return 0; |
| 571 | else |
| 572 | return -1; |
| 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Mainprogram. |
| 577 | */ |
| 578 | |
| 579 | static |
| 580 | void usage(char *argv[]) __attribute__((__noreturn__)); |
| 581 | |
| 582 | static |
| 583 | void usage(char *argv[]) |
| 584 | { |
| 585 | diag("Usage: %s nreaders [ perf | rperf | uperf | stress ] [ stride ] [ callrcu_global | callrcu_percpu | callrcu_perthread ]\n", argv[0]); |
| 586 | exit(-1); |
| 587 | } |
| 588 | |
| 589 | int main(int argc, char *argv[]) |
| 590 | { |
| 591 | int nreaders = 1; |
| 592 | int cpustride = 1; |
| 593 | |
| 594 | plan_tests(NR_TESTS); |
| 595 | |
| 596 | smp_init(); |
| 597 | //rcu_init(); |
| 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 { |
| 608 | usage(argv); |
| 609 | goto end; |
| 610 | } |
| 611 | } |
| 612 | |
| 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."); |
| 619 | if (create_all_cpu_call_rcu_data(0)) |
| 620 | diag("create_all_cpu_call_rcu_data: %s", |
| 621 | strerror(errno)); |
| 622 | break; |
| 623 | case CALLRCU_PERTHREAD: |
| 624 | diag("Using per-thread call_rcu() worker."); |
| 625 | break; |
| 626 | default: |
| 627 | abort(); |
| 628 | } |
| 629 | |
| 630 | #ifdef DEBUG_YIELD |
| 631 | yield_active |= YIELD_READ; |
| 632 | yield_active |= YIELD_WRITE; |
| 633 | #endif |
| 634 | |
| 635 | if (argc > 1) { |
| 636 | if (strcmp(argv[1], "-h") == 0 |
| 637 | || strcmp(argv[1], "--help") == 0) { |
| 638 | usage(argv); |
| 639 | goto end; |
| 640 | } |
| 641 | nreaders = strtoul(argv[1], NULL, 0); |
| 642 | if (argc == 2) { |
| 643 | ok(!perftest(nreaders, cpustride), |
| 644 | "perftest readers: %d, stride: %d", |
| 645 | nreaders, cpustride); |
| 646 | goto end; |
| 647 | } |
| 648 | if (argc > 3) |
| 649 | cpustride = strtoul(argv[3], NULL, 0); |
| 650 | if (strcmp(argv[2], "perf") == 0) |
| 651 | ok(!perftest(nreaders, cpustride), |
| 652 | "perftest readers: %d, stride: %d", |
| 653 | nreaders, cpustride); |
| 654 | else if (strcmp(argv[2], "rperf") == 0) |
| 655 | ok(!rperftest(nreaders, cpustride), |
| 656 | "rperftest readers: %d, stride: %d", |
| 657 | nreaders, cpustride); |
| 658 | else if (strcmp(argv[2], "uperf") == 0) |
| 659 | ok(!uperftest(nreaders, cpustride), |
| 660 | "uperftest readers: %d, stride: %d", |
| 661 | nreaders, cpustride); |
| 662 | else if (strcmp(argv[2], "stress") == 0) |
| 663 | ok(!stresstest(nreaders), |
| 664 | "stresstest readers: %d, stride: %d", |
| 665 | nreaders, cpustride); |
| 666 | else |
| 667 | usage(argv); |
| 668 | } else { |
| 669 | usage(argv); |
| 670 | } |
| 671 | end: |
| 672 | return exit_status(); |
| 673 | } |