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8704baab PM |
1 | /* |
2 | * Read-Copy Update module-based performance-test facility | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, you can access it online at | |
16 | * http://www.gnu.org/licenses/gpl-2.0.html. | |
17 | * | |
18 | * Copyright (C) IBM Corporation, 2015 | |
19 | * | |
20 | * Authors: Paul E. McKenney <paulmck@us.ibm.com> | |
21 | */ | |
22 | #include <linux/types.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/kthread.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/smp.h> | |
30 | #include <linux/rcupdate.h> | |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/sched.h> | |
33 | #include <linux/atomic.h> | |
34 | #include <linux/bitops.h> | |
35 | #include <linux/completion.h> | |
36 | #include <linux/moduleparam.h> | |
37 | #include <linux/percpu.h> | |
38 | #include <linux/notifier.h> | |
39 | #include <linux/reboot.h> | |
40 | #include <linux/freezer.h> | |
41 | #include <linux/cpu.h> | |
42 | #include <linux/delay.h> | |
43 | #include <linux/stat.h> | |
44 | #include <linux/srcu.h> | |
45 | #include <linux/slab.h> | |
46 | #include <asm/byteorder.h> | |
47 | #include <linux/torture.h> | |
48 | #include <linux/vmalloc.h> | |
49 | ||
50 | MODULE_LICENSE("GPL"); | |
51 | MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.vnet.ibm.com>"); | |
52 | ||
53 | #define PERF_FLAG "-perf:" | |
54 | #define PERFOUT_STRING(s) \ | |
55 | pr_alert("%s" PERF_FLAG s "\n", perf_type) | |
56 | #define VERBOSE_PERFOUT_STRING(s) \ | |
57 | do { if (verbose) pr_alert("%s" PERF_FLAG " %s\n", perf_type, s); } while (0) | |
58 | #define VERBOSE_PERFOUT_ERRSTRING(s) \ | |
59 | do { if (verbose) pr_alert("%s" PERF_FLAG "!!! %s\n", perf_type, s); } while (0) | |
60 | ||
61 | torture_param(bool, gp_exp, true, "Use expedited GP wait primitives"); | |
62 | torture_param(int, nreaders, -1, "Number of RCU reader threads"); | |
63 | torture_param(int, nwriters, -1, "Number of RCU updater threads"); | |
64 | torture_param(bool, shutdown, false, "Shutdown at end of performance tests."); | |
65 | torture_param(bool, verbose, true, "Enable verbose debugging printk()s"); | |
66 | ||
67 | static char *perf_type = "rcu"; | |
68 | module_param(perf_type, charp, 0444); | |
69 | MODULE_PARM_DESC(perf_type, "Type of RCU to performance-test (rcu, rcu_bh, ...)"); | |
70 | ||
71 | static int nrealreaders; | |
72 | static int nrealwriters; | |
73 | static struct task_struct **writer_tasks; | |
74 | static struct task_struct **reader_tasks; | |
75 | static struct task_struct *shutdown_task; | |
76 | ||
77 | static u64 **writer_durations; | |
78 | static int *writer_n_durations; | |
79 | static atomic_t n_rcu_perf_reader_started; | |
80 | static atomic_t n_rcu_perf_writer_started; | |
81 | static atomic_t n_rcu_perf_writer_finished; | |
82 | static wait_queue_head_t shutdown_wq; | |
83 | static u64 t_rcu_perf_writer_started; | |
84 | static u64 t_rcu_perf_writer_finished; | |
85 | static unsigned long b_rcu_perf_writer_started; | |
86 | static unsigned long b_rcu_perf_writer_finished; | |
87 | ||
88 | static int rcu_perf_writer_state; | |
89 | #define RTWS_INIT 0 | |
90 | #define RTWS_EXP_SYNC 1 | |
91 | #define RTWS_SYNC 2 | |
92 | #define RTWS_IDLE 2 | |
93 | #define RTWS_STOPPING 3 | |
94 | ||
95 | #define MAX_MEAS 10000 | |
96 | #define MIN_MEAS 100 | |
97 | ||
98 | #if defined(MODULE) || defined(CONFIG_RCU_PERF_TEST_RUNNABLE) | |
99 | #define RCUPERF_RUNNABLE_INIT 1 | |
100 | #else | |
101 | #define RCUPERF_RUNNABLE_INIT 0 | |
102 | #endif | |
103 | static int perf_runnable = RCUPERF_RUNNABLE_INIT; | |
104 | module_param(perf_runnable, int, 0444); | |
105 | MODULE_PARM_DESC(perf_runnable, "Start rcuperf at boot"); | |
106 | ||
107 | /* | |
108 | * Operations vector for selecting different types of tests. | |
109 | */ | |
110 | ||
111 | struct rcu_perf_ops { | |
112 | int ptype; | |
113 | void (*init)(void); | |
114 | void (*cleanup)(void); | |
115 | int (*readlock)(void); | |
116 | void (*readunlock)(int idx); | |
117 | unsigned long (*started)(void); | |
118 | unsigned long (*completed)(void); | |
119 | unsigned long (*exp_completed)(void); | |
120 | void (*sync)(void); | |
121 | void (*exp_sync)(void); | |
122 | const char *name; | |
123 | }; | |
124 | ||
125 | static struct rcu_perf_ops *cur_ops; | |
126 | ||
127 | /* | |
128 | * Definitions for rcu perf testing. | |
129 | */ | |
130 | ||
131 | static int rcu_perf_read_lock(void) __acquires(RCU) | |
132 | { | |
133 | rcu_read_lock(); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static void rcu_perf_read_unlock(int idx) __releases(RCU) | |
138 | { | |
139 | rcu_read_unlock(); | |
140 | } | |
141 | ||
142 | static unsigned long __maybe_unused rcu_no_completed(void) | |
143 | { | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static void rcu_sync_perf_init(void) | |
148 | { | |
149 | } | |
150 | ||
151 | static struct rcu_perf_ops rcu_ops = { | |
152 | .ptype = RCU_FLAVOR, | |
153 | .init = rcu_sync_perf_init, | |
154 | .readlock = rcu_perf_read_lock, | |
155 | .readunlock = rcu_perf_read_unlock, | |
156 | .started = rcu_batches_started, | |
157 | .completed = rcu_batches_completed, | |
158 | .exp_completed = rcu_exp_batches_completed, | |
159 | .sync = synchronize_rcu, | |
160 | .exp_sync = synchronize_rcu_expedited, | |
161 | .name = "rcu" | |
162 | }; | |
163 | ||
164 | /* | |
165 | * Definitions for rcu_bh perf testing. | |
166 | */ | |
167 | ||
168 | static int rcu_bh_perf_read_lock(void) __acquires(RCU_BH) | |
169 | { | |
170 | rcu_read_lock_bh(); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | static void rcu_bh_perf_read_unlock(int idx) __releases(RCU_BH) | |
175 | { | |
176 | rcu_read_unlock_bh(); | |
177 | } | |
178 | ||
179 | static struct rcu_perf_ops rcu_bh_ops = { | |
180 | .ptype = RCU_BH_FLAVOR, | |
181 | .init = rcu_sync_perf_init, | |
182 | .readlock = rcu_bh_perf_read_lock, | |
183 | .readunlock = rcu_bh_perf_read_unlock, | |
184 | .started = rcu_batches_started_bh, | |
185 | .completed = rcu_batches_completed_bh, | |
186 | .exp_completed = rcu_exp_batches_completed_sched, | |
187 | .sync = synchronize_rcu_bh, | |
188 | .exp_sync = synchronize_rcu_bh_expedited, | |
189 | .name = "rcu_bh" | |
190 | }; | |
191 | ||
192 | /* | |
193 | * Definitions for srcu perf testing. | |
194 | */ | |
195 | ||
196 | DEFINE_STATIC_SRCU(srcu_ctl_perf); | |
197 | static struct srcu_struct *srcu_ctlp = &srcu_ctl_perf; | |
198 | ||
199 | static int srcu_perf_read_lock(void) __acquires(srcu_ctlp) | |
200 | { | |
201 | return srcu_read_lock(srcu_ctlp); | |
202 | } | |
203 | ||
204 | static void srcu_perf_read_unlock(int idx) __releases(srcu_ctlp) | |
205 | { | |
206 | srcu_read_unlock(srcu_ctlp, idx); | |
207 | } | |
208 | ||
209 | static unsigned long srcu_perf_completed(void) | |
210 | { | |
211 | return srcu_batches_completed(srcu_ctlp); | |
212 | } | |
213 | ||
214 | static void srcu_perf_synchronize(void) | |
215 | { | |
216 | synchronize_srcu(srcu_ctlp); | |
217 | } | |
218 | ||
219 | static void srcu_perf_synchronize_expedited(void) | |
220 | { | |
221 | synchronize_srcu_expedited(srcu_ctlp); | |
222 | } | |
223 | ||
224 | static struct rcu_perf_ops srcu_ops = { | |
225 | .ptype = SRCU_FLAVOR, | |
226 | .init = rcu_sync_perf_init, | |
227 | .readlock = srcu_perf_read_lock, | |
228 | .readunlock = srcu_perf_read_unlock, | |
229 | .started = NULL, | |
230 | .completed = srcu_perf_completed, | |
231 | .exp_completed = srcu_perf_completed, | |
232 | .sync = srcu_perf_synchronize, | |
233 | .exp_sync = srcu_perf_synchronize_expedited, | |
234 | .name = "srcu" | |
235 | }; | |
236 | ||
237 | /* | |
238 | * Definitions for sched perf testing. | |
239 | */ | |
240 | ||
241 | static int sched_perf_read_lock(void) | |
242 | { | |
243 | preempt_disable(); | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static void sched_perf_read_unlock(int idx) | |
248 | { | |
249 | preempt_enable(); | |
250 | } | |
251 | ||
252 | static struct rcu_perf_ops sched_ops = { | |
253 | .ptype = RCU_SCHED_FLAVOR, | |
254 | .init = rcu_sync_perf_init, | |
255 | .readlock = sched_perf_read_lock, | |
256 | .readunlock = sched_perf_read_unlock, | |
257 | .started = rcu_batches_started_sched, | |
258 | .completed = rcu_batches_completed_sched, | |
259 | .exp_completed = rcu_exp_batches_completed_sched, | |
260 | .sync = synchronize_sched, | |
261 | .exp_sync = synchronize_sched_expedited, | |
262 | .name = "sched" | |
263 | }; | |
264 | ||
265 | #ifdef CONFIG_TASKS_RCU | |
266 | ||
267 | /* | |
268 | * Definitions for RCU-tasks perf testing. | |
269 | */ | |
270 | ||
271 | static int tasks_perf_read_lock(void) | |
272 | { | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static void tasks_perf_read_unlock(int idx) | |
277 | { | |
278 | } | |
279 | ||
280 | static struct rcu_perf_ops tasks_ops = { | |
281 | .ptype = RCU_TASKS_FLAVOR, | |
282 | .init = rcu_sync_perf_init, | |
283 | .readlock = tasks_perf_read_lock, | |
284 | .readunlock = tasks_perf_read_unlock, | |
285 | .started = rcu_no_completed, | |
286 | .completed = rcu_no_completed, | |
287 | .sync = synchronize_rcu_tasks, | |
288 | .exp_sync = synchronize_rcu_tasks, | |
289 | .name = "tasks" | |
290 | }; | |
291 | ||
292 | #define RCUPERF_TASKS_OPS &tasks_ops, | |
293 | ||
294 | static bool __maybe_unused torturing_tasks(void) | |
295 | { | |
296 | return cur_ops == &tasks_ops; | |
297 | } | |
298 | ||
299 | #else /* #ifdef CONFIG_TASKS_RCU */ | |
300 | ||
301 | #define RCUPERF_TASKS_OPS | |
302 | ||
303 | static bool __maybe_unused torturing_tasks(void) | |
304 | { | |
305 | return false; | |
306 | } | |
307 | ||
308 | #endif /* #else #ifdef CONFIG_TASKS_RCU */ | |
309 | ||
310 | /* | |
311 | * If performance tests complete, wait for shutdown to commence. | |
312 | */ | |
313 | static void rcu_perf_wait_shutdown(void) | |
314 | { | |
315 | cond_resched_rcu_qs(); | |
316 | if (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters) | |
317 | return; | |
318 | while (!torture_must_stop()) | |
319 | schedule_timeout_uninterruptible(1); | |
320 | } | |
321 | ||
322 | /* | |
323 | * RCU perf reader kthread. Repeatedly does empty RCU read-side | |
324 | * critical section, minimizing update-side interference. | |
325 | */ | |
326 | static int | |
327 | rcu_perf_reader(void *arg) | |
328 | { | |
329 | unsigned long flags; | |
330 | int idx; | |
331 | ||
332 | VERBOSE_PERFOUT_STRING("rcu_perf_reader task started"); | |
333 | set_user_nice(current, MAX_NICE); | |
334 | atomic_inc(&n_rcu_perf_reader_started); | |
335 | ||
336 | do { | |
337 | local_irq_save(flags); | |
338 | idx = cur_ops->readlock(); | |
339 | cur_ops->readunlock(idx); | |
340 | local_irq_restore(flags); | |
341 | rcu_perf_wait_shutdown(); | |
342 | } while (!torture_must_stop()); | |
343 | torture_kthread_stopping("rcu_perf_reader"); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | /* | |
348 | * RCU perf writer kthread. Repeatedly does a grace period. | |
349 | */ | |
350 | static int | |
351 | rcu_perf_writer(void *arg) | |
352 | { | |
353 | int i = 0; | |
354 | int i_max; | |
355 | long me = (long)arg; | |
356 | bool started = false, done = false, alldone = false; | |
357 | u64 t; | |
358 | u64 *wdp; | |
359 | u64 *wdpp = writer_durations[me]; | |
360 | ||
361 | VERBOSE_PERFOUT_STRING("rcu_perf_writer task started"); | |
362 | WARN_ON(rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp); | |
363 | WARN_ON(rcu_gp_is_normal() && gp_exp); | |
364 | WARN_ON(!wdpp); | |
365 | t = ktime_get_mono_fast_ns(); | |
366 | if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) { | |
367 | t_rcu_perf_writer_started = t; | |
368 | if (gp_exp) { | |
369 | b_rcu_perf_writer_started = | |
370 | cur_ops->exp_completed() / 2; | |
371 | } else { | |
372 | b_rcu_perf_writer_started = | |
373 | cur_ops->completed(); | |
374 | } | |
375 | } | |
376 | ||
377 | do { | |
378 | wdp = &wdpp[i]; | |
379 | *wdp = ktime_get_mono_fast_ns(); | |
380 | if (gp_exp) { | |
381 | rcu_perf_writer_state = RTWS_EXP_SYNC; | |
382 | cur_ops->exp_sync(); | |
383 | } else { | |
384 | rcu_perf_writer_state = RTWS_SYNC; | |
385 | cur_ops->sync(); | |
386 | } | |
387 | rcu_perf_writer_state = RTWS_IDLE; | |
388 | t = ktime_get_mono_fast_ns(); | |
389 | *wdp = t - *wdp; | |
390 | i_max = i; | |
391 | if (!started && | |
392 | atomic_read(&n_rcu_perf_writer_started) >= nrealwriters) | |
393 | started = true; | |
394 | if (!done && i >= MIN_MEAS) { | |
395 | done = true; | |
396 | pr_alert("%s" PERF_FLAG | |
397 | "rcu_perf_writer %ld has %d measurements\n", | |
398 | perf_type, me, MIN_MEAS); | |
399 | if (atomic_inc_return(&n_rcu_perf_writer_finished) >= | |
400 | nrealwriters) { | |
401 | PERFOUT_STRING("Test complete"); | |
402 | t_rcu_perf_writer_finished = t; | |
403 | if (gp_exp) { | |
404 | b_rcu_perf_writer_finished = | |
405 | cur_ops->exp_completed() / 2; | |
406 | } else { | |
407 | b_rcu_perf_writer_finished = | |
408 | cur_ops->completed(); | |
409 | } | |
410 | smp_mb(); /* Assign before wake. */ | |
411 | wake_up(&shutdown_wq); | |
412 | } | |
413 | } | |
414 | if (done && !alldone && | |
415 | atomic_read(&n_rcu_perf_writer_finished) >= nrealwriters) | |
416 | alldone = true; | |
417 | if (started && !alldone && i < MAX_MEAS - 1) | |
418 | i++; | |
419 | rcu_perf_wait_shutdown(); | |
420 | } while (!torture_must_stop()); | |
421 | rcu_perf_writer_state = RTWS_STOPPING; | |
422 | writer_n_durations[me] = i_max; | |
423 | torture_kthread_stopping("rcu_perf_writer"); | |
424 | return 0; | |
425 | } | |
426 | ||
427 | static inline void | |
428 | rcu_perf_print_module_parms(struct rcu_perf_ops *cur_ops, const char *tag) | |
429 | { | |
430 | pr_alert("%s" PERF_FLAG | |
431 | "--- %s: nreaders=%d nwriters=%d verbose=%d shutdown=%d\n", | |
432 | perf_type, tag, nrealreaders, nrealwriters, verbose, shutdown); | |
433 | } | |
434 | ||
435 | static void | |
436 | rcu_perf_cleanup(void) | |
437 | { | |
438 | int i; | |
439 | int j; | |
440 | int ngps = 0; | |
441 | u64 *wdp; | |
442 | u64 *wdpp; | |
443 | ||
444 | if (torture_cleanup_begin()) | |
445 | return; | |
446 | ||
447 | if (reader_tasks) { | |
448 | for (i = 0; i < nrealreaders; i++) | |
449 | torture_stop_kthread(rcu_perf_reader, | |
450 | reader_tasks[i]); | |
451 | kfree(reader_tasks); | |
452 | } | |
453 | ||
454 | if (writer_tasks) { | |
455 | for (i = 0; i < nrealwriters; i++) { | |
456 | torture_stop_kthread(rcu_perf_writer, | |
457 | writer_tasks[i]); | |
458 | if (!writer_n_durations) | |
459 | continue; | |
460 | j = writer_n_durations[i]; | |
461 | pr_alert("%s%s writer %d gps: %d\n", | |
462 | perf_type, PERF_FLAG, i, j); | |
463 | ngps += j; | |
464 | } | |
465 | pr_alert("%s%s start: %llu end: %llu duration: %llu gps: %d batches: %ld\n", | |
466 | perf_type, PERF_FLAG, | |
467 | t_rcu_perf_writer_started, t_rcu_perf_writer_finished, | |
468 | t_rcu_perf_writer_finished - | |
469 | t_rcu_perf_writer_started, | |
470 | ngps, | |
471 | b_rcu_perf_writer_finished - | |
472 | b_rcu_perf_writer_started); | |
473 | for (i = 0; i < nrealwriters; i++) { | |
474 | if (!writer_durations) | |
475 | break; | |
476 | if (!writer_n_durations) | |
477 | continue; | |
478 | wdpp = writer_durations[i]; | |
479 | if (!wdpp) | |
480 | continue; | |
481 | for (j = 0; j <= writer_n_durations[i]; j++) { | |
482 | wdp = &wdpp[j]; | |
483 | pr_alert("%s%s %4d writer-duration: %5d %llu\n", | |
484 | perf_type, PERF_FLAG, | |
485 | i, j, *wdp); | |
486 | if (j % 100 == 0) | |
487 | schedule_timeout_uninterruptible(1); | |
488 | } | |
489 | kfree(writer_durations[i]); | |
490 | } | |
491 | kfree(writer_tasks); | |
492 | kfree(writer_durations); | |
493 | kfree(writer_n_durations); | |
494 | } | |
495 | ||
496 | /* Do flavor-specific cleanup operations. */ | |
497 | if (cur_ops->cleanup != NULL) | |
498 | cur_ops->cleanup(); | |
499 | ||
500 | torture_cleanup_end(); | |
501 | } | |
502 | ||
503 | /* | |
504 | * Return the number if non-negative. If -1, the number of CPUs. | |
505 | * If less than -1, that much less than the number of CPUs, but | |
506 | * at least one. | |
507 | */ | |
508 | static int compute_real(int n) | |
509 | { | |
510 | int nr; | |
511 | ||
512 | if (n >= 0) { | |
513 | nr = n; | |
514 | } else { | |
515 | nr = num_online_cpus() + 1 + n; | |
516 | if (nr <= 0) | |
517 | nr = 1; | |
518 | } | |
519 | return nr; | |
520 | } | |
521 | ||
522 | /* | |
523 | * RCU perf shutdown kthread. Just waits to be awakened, then shuts | |
524 | * down system. | |
525 | */ | |
526 | static int | |
527 | rcu_perf_shutdown(void *arg) | |
528 | { | |
529 | do { | |
530 | wait_event(shutdown_wq, | |
531 | atomic_read(&n_rcu_perf_writer_finished) >= | |
532 | nrealwriters); | |
533 | } while (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters); | |
534 | smp_mb(); /* Wake before output. */ | |
535 | rcu_perf_cleanup(); | |
536 | kernel_power_off(); | |
537 | return -EINVAL; | |
538 | } | |
539 | ||
540 | static int __init | |
541 | rcu_perf_init(void) | |
542 | { | |
543 | long i; | |
544 | int firsterr = 0; | |
545 | static struct rcu_perf_ops *perf_ops[] = { | |
546 | &rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops, | |
547 | RCUPERF_TASKS_OPS | |
548 | }; | |
549 | ||
550 | if (!torture_init_begin(perf_type, verbose, &perf_runnable)) | |
551 | return -EBUSY; | |
552 | ||
553 | /* Process args and tell the world that the perf'er is on the job. */ | |
554 | for (i = 0; i < ARRAY_SIZE(perf_ops); i++) { | |
555 | cur_ops = perf_ops[i]; | |
556 | if (strcmp(perf_type, cur_ops->name) == 0) | |
557 | break; | |
558 | } | |
559 | if (i == ARRAY_SIZE(perf_ops)) { | |
560 | pr_alert("rcu-perf: invalid perf type: \"%s\"\n", | |
561 | perf_type); | |
562 | pr_alert("rcu-perf types:"); | |
563 | for (i = 0; i < ARRAY_SIZE(perf_ops); i++) | |
564 | pr_alert(" %s", perf_ops[i]->name); | |
565 | pr_alert("\n"); | |
566 | firsterr = -EINVAL; | |
567 | goto unwind; | |
568 | } | |
569 | if (cur_ops->init) | |
570 | cur_ops->init(); | |
571 | ||
572 | nrealwriters = compute_real(nwriters); | |
573 | nrealreaders = compute_real(nreaders); | |
574 | atomic_set(&n_rcu_perf_reader_started, 0); | |
575 | atomic_set(&n_rcu_perf_writer_started, 0); | |
576 | atomic_set(&n_rcu_perf_writer_finished, 0); | |
577 | rcu_perf_print_module_parms(cur_ops, "Start of test"); | |
578 | ||
579 | /* Start up the kthreads. */ | |
580 | ||
581 | if (shutdown) { | |
582 | init_waitqueue_head(&shutdown_wq); | |
583 | firsterr = torture_create_kthread(rcu_perf_shutdown, NULL, | |
584 | shutdown_task); | |
585 | if (firsterr) | |
586 | goto unwind; | |
587 | schedule_timeout_uninterruptible(1); | |
588 | } | |
589 | reader_tasks = kcalloc(nrealreaders, sizeof(reader_tasks[0]), | |
590 | GFP_KERNEL); | |
591 | if (reader_tasks == NULL) { | |
592 | VERBOSE_PERFOUT_ERRSTRING("out of memory"); | |
593 | firsterr = -ENOMEM; | |
594 | goto unwind; | |
595 | } | |
596 | for (i = 0; i < nrealreaders; i++) { | |
597 | firsterr = torture_create_kthread(rcu_perf_reader, NULL, | |
598 | reader_tasks[i]); | |
599 | if (firsterr) | |
600 | goto unwind; | |
601 | } | |
602 | while (atomic_read(&n_rcu_perf_reader_started) < nrealreaders) | |
603 | schedule_timeout_uninterruptible(1); | |
604 | writer_tasks = kcalloc(nrealwriters, sizeof(reader_tasks[0]), | |
605 | GFP_KERNEL); | |
606 | writer_durations = kcalloc(nrealwriters, sizeof(*writer_durations), | |
607 | GFP_KERNEL); | |
608 | writer_n_durations = | |
609 | kcalloc(nrealwriters, sizeof(*writer_n_durations), | |
610 | GFP_KERNEL); | |
611 | if (!writer_tasks || !writer_durations || !writer_n_durations) { | |
612 | VERBOSE_PERFOUT_ERRSTRING("out of memory"); | |
613 | firsterr = -ENOMEM; | |
614 | goto unwind; | |
615 | } | |
616 | for (i = 0; i < nrealwriters; i++) { | |
617 | writer_durations[i] = | |
618 | kcalloc(MAX_MEAS, sizeof(*writer_durations[i]), | |
619 | GFP_KERNEL); | |
620 | if (!writer_durations[i]) | |
621 | goto unwind; | |
622 | firsterr = torture_create_kthread(rcu_perf_writer, (void *)i, | |
623 | writer_tasks[i]); | |
624 | if (firsterr) | |
625 | goto unwind; | |
626 | } | |
627 | torture_init_end(); | |
628 | return 0; | |
629 | ||
630 | unwind: | |
631 | torture_init_end(); | |
632 | rcu_perf_cleanup(); | |
633 | return firsterr; | |
634 | } | |
635 | ||
636 | module_init(rcu_perf_init); | |
637 | module_exit(rcu_perf_cleanup); |