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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"); | |
df37e66b | 62 | torture_param(int, holdoff, 10, "Holdoff time before test start (s)"); |
8704baab PM |
63 | torture_param(int, nreaders, -1, "Number of RCU reader threads"); |
64 | torture_param(int, nwriters, -1, "Number of RCU updater threads"); | |
65 | torture_param(bool, shutdown, false, "Shutdown at end of performance tests."); | |
66 | torture_param(bool, verbose, true, "Enable verbose debugging printk()s"); | |
67 | ||
68 | static char *perf_type = "rcu"; | |
69 | module_param(perf_type, charp, 0444); | |
70 | MODULE_PARM_DESC(perf_type, "Type of RCU to performance-test (rcu, rcu_bh, ...)"); | |
71 | ||
72 | static int nrealreaders; | |
73 | static int nrealwriters; | |
74 | static struct task_struct **writer_tasks; | |
75 | static struct task_struct **reader_tasks; | |
76 | static struct task_struct *shutdown_task; | |
77 | ||
78 | static u64 **writer_durations; | |
79 | static int *writer_n_durations; | |
80 | static atomic_t n_rcu_perf_reader_started; | |
81 | static atomic_t n_rcu_perf_writer_started; | |
82 | static atomic_t n_rcu_perf_writer_finished; | |
83 | static wait_queue_head_t shutdown_wq; | |
84 | static u64 t_rcu_perf_writer_started; | |
85 | static u64 t_rcu_perf_writer_finished; | |
86 | static unsigned long b_rcu_perf_writer_started; | |
87 | static unsigned long b_rcu_perf_writer_finished; | |
88 | ||
89 | static int rcu_perf_writer_state; | |
90 | #define RTWS_INIT 0 | |
91 | #define RTWS_EXP_SYNC 1 | |
92 | #define RTWS_SYNC 2 | |
93 | #define RTWS_IDLE 2 | |
94 | #define RTWS_STOPPING 3 | |
95 | ||
96 | #define MAX_MEAS 10000 | |
97 | #define MIN_MEAS 100 | |
98 | ||
99 | #if defined(MODULE) || defined(CONFIG_RCU_PERF_TEST_RUNNABLE) | |
100 | #define RCUPERF_RUNNABLE_INIT 1 | |
101 | #else | |
102 | #define RCUPERF_RUNNABLE_INIT 0 | |
103 | #endif | |
104 | static int perf_runnable = RCUPERF_RUNNABLE_INIT; | |
105 | module_param(perf_runnable, int, 0444); | |
106 | MODULE_PARM_DESC(perf_runnable, "Start rcuperf at boot"); | |
107 | ||
108 | /* | |
109 | * Operations vector for selecting different types of tests. | |
110 | */ | |
111 | ||
112 | struct rcu_perf_ops { | |
113 | int ptype; | |
114 | void (*init)(void); | |
115 | void (*cleanup)(void); | |
116 | int (*readlock)(void); | |
117 | void (*readunlock)(int idx); | |
118 | unsigned long (*started)(void); | |
119 | unsigned long (*completed)(void); | |
120 | unsigned long (*exp_completed)(void); | |
121 | void (*sync)(void); | |
122 | void (*exp_sync)(void); | |
123 | const char *name; | |
124 | }; | |
125 | ||
126 | static struct rcu_perf_ops *cur_ops; | |
127 | ||
128 | /* | |
129 | * Definitions for rcu perf testing. | |
130 | */ | |
131 | ||
132 | static int rcu_perf_read_lock(void) __acquires(RCU) | |
133 | { | |
134 | rcu_read_lock(); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static void rcu_perf_read_unlock(int idx) __releases(RCU) | |
139 | { | |
140 | rcu_read_unlock(); | |
141 | } | |
142 | ||
143 | static unsigned long __maybe_unused rcu_no_completed(void) | |
144 | { | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static void rcu_sync_perf_init(void) | |
149 | { | |
150 | } | |
151 | ||
152 | static struct rcu_perf_ops rcu_ops = { | |
153 | .ptype = RCU_FLAVOR, | |
154 | .init = rcu_sync_perf_init, | |
155 | .readlock = rcu_perf_read_lock, | |
156 | .readunlock = rcu_perf_read_unlock, | |
157 | .started = rcu_batches_started, | |
158 | .completed = rcu_batches_completed, | |
159 | .exp_completed = rcu_exp_batches_completed, | |
160 | .sync = synchronize_rcu, | |
161 | .exp_sync = synchronize_rcu_expedited, | |
162 | .name = "rcu" | |
163 | }; | |
164 | ||
165 | /* | |
166 | * Definitions for rcu_bh perf testing. | |
167 | */ | |
168 | ||
169 | static int rcu_bh_perf_read_lock(void) __acquires(RCU_BH) | |
170 | { | |
171 | rcu_read_lock_bh(); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static void rcu_bh_perf_read_unlock(int idx) __releases(RCU_BH) | |
176 | { | |
177 | rcu_read_unlock_bh(); | |
178 | } | |
179 | ||
180 | static struct rcu_perf_ops rcu_bh_ops = { | |
181 | .ptype = RCU_BH_FLAVOR, | |
182 | .init = rcu_sync_perf_init, | |
183 | .readlock = rcu_bh_perf_read_lock, | |
184 | .readunlock = rcu_bh_perf_read_unlock, | |
185 | .started = rcu_batches_started_bh, | |
186 | .completed = rcu_batches_completed_bh, | |
187 | .exp_completed = rcu_exp_batches_completed_sched, | |
188 | .sync = synchronize_rcu_bh, | |
189 | .exp_sync = synchronize_rcu_bh_expedited, | |
190 | .name = "rcu_bh" | |
191 | }; | |
192 | ||
193 | /* | |
194 | * Definitions for srcu perf testing. | |
195 | */ | |
196 | ||
197 | DEFINE_STATIC_SRCU(srcu_ctl_perf); | |
198 | static struct srcu_struct *srcu_ctlp = &srcu_ctl_perf; | |
199 | ||
200 | static int srcu_perf_read_lock(void) __acquires(srcu_ctlp) | |
201 | { | |
202 | return srcu_read_lock(srcu_ctlp); | |
203 | } | |
204 | ||
205 | static void srcu_perf_read_unlock(int idx) __releases(srcu_ctlp) | |
206 | { | |
207 | srcu_read_unlock(srcu_ctlp, idx); | |
208 | } | |
209 | ||
210 | static unsigned long srcu_perf_completed(void) | |
211 | { | |
212 | return srcu_batches_completed(srcu_ctlp); | |
213 | } | |
214 | ||
215 | static void srcu_perf_synchronize(void) | |
216 | { | |
217 | synchronize_srcu(srcu_ctlp); | |
218 | } | |
219 | ||
220 | static void srcu_perf_synchronize_expedited(void) | |
221 | { | |
222 | synchronize_srcu_expedited(srcu_ctlp); | |
223 | } | |
224 | ||
225 | static struct rcu_perf_ops srcu_ops = { | |
226 | .ptype = SRCU_FLAVOR, | |
227 | .init = rcu_sync_perf_init, | |
228 | .readlock = srcu_perf_read_lock, | |
229 | .readunlock = srcu_perf_read_unlock, | |
230 | .started = NULL, | |
231 | .completed = srcu_perf_completed, | |
232 | .exp_completed = srcu_perf_completed, | |
233 | .sync = srcu_perf_synchronize, | |
234 | .exp_sync = srcu_perf_synchronize_expedited, | |
235 | .name = "srcu" | |
236 | }; | |
237 | ||
238 | /* | |
239 | * Definitions for sched perf testing. | |
240 | */ | |
241 | ||
242 | static int sched_perf_read_lock(void) | |
243 | { | |
244 | preempt_disable(); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static void sched_perf_read_unlock(int idx) | |
249 | { | |
250 | preempt_enable(); | |
251 | } | |
252 | ||
253 | static struct rcu_perf_ops sched_ops = { | |
254 | .ptype = RCU_SCHED_FLAVOR, | |
255 | .init = rcu_sync_perf_init, | |
256 | .readlock = sched_perf_read_lock, | |
257 | .readunlock = sched_perf_read_unlock, | |
258 | .started = rcu_batches_started_sched, | |
259 | .completed = rcu_batches_completed_sched, | |
260 | .exp_completed = rcu_exp_batches_completed_sched, | |
261 | .sync = synchronize_sched, | |
262 | .exp_sync = synchronize_sched_expedited, | |
263 | .name = "sched" | |
264 | }; | |
265 | ||
266 | #ifdef CONFIG_TASKS_RCU | |
267 | ||
268 | /* | |
269 | * Definitions for RCU-tasks perf testing. | |
270 | */ | |
271 | ||
272 | static int tasks_perf_read_lock(void) | |
273 | { | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static void tasks_perf_read_unlock(int idx) | |
278 | { | |
279 | } | |
280 | ||
281 | static struct rcu_perf_ops tasks_ops = { | |
282 | .ptype = RCU_TASKS_FLAVOR, | |
283 | .init = rcu_sync_perf_init, | |
284 | .readlock = tasks_perf_read_lock, | |
285 | .readunlock = tasks_perf_read_unlock, | |
286 | .started = rcu_no_completed, | |
287 | .completed = rcu_no_completed, | |
288 | .sync = synchronize_rcu_tasks, | |
289 | .exp_sync = synchronize_rcu_tasks, | |
290 | .name = "tasks" | |
291 | }; | |
292 | ||
293 | #define RCUPERF_TASKS_OPS &tasks_ops, | |
294 | ||
295 | static bool __maybe_unused torturing_tasks(void) | |
296 | { | |
297 | return cur_ops == &tasks_ops; | |
298 | } | |
299 | ||
300 | #else /* #ifdef CONFIG_TASKS_RCU */ | |
301 | ||
302 | #define RCUPERF_TASKS_OPS | |
303 | ||
304 | static bool __maybe_unused torturing_tasks(void) | |
305 | { | |
306 | return false; | |
307 | } | |
308 | ||
309 | #endif /* #else #ifdef CONFIG_TASKS_RCU */ | |
310 | ||
311 | /* | |
312 | * If performance tests complete, wait for shutdown to commence. | |
313 | */ | |
314 | static void rcu_perf_wait_shutdown(void) | |
315 | { | |
316 | cond_resched_rcu_qs(); | |
317 | if (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters) | |
318 | return; | |
319 | while (!torture_must_stop()) | |
320 | schedule_timeout_uninterruptible(1); | |
321 | } | |
322 | ||
323 | /* | |
324 | * RCU perf reader kthread. Repeatedly does empty RCU read-side | |
325 | * critical section, minimizing update-side interference. | |
326 | */ | |
327 | static int | |
328 | rcu_perf_reader(void *arg) | |
329 | { | |
330 | unsigned long flags; | |
331 | int idx; | |
6b558c4c | 332 | long me = (long)arg; |
8704baab PM |
333 | |
334 | VERBOSE_PERFOUT_STRING("rcu_perf_reader task started"); | |
6b558c4c | 335 | set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); |
8704baab PM |
336 | set_user_nice(current, MAX_NICE); |
337 | atomic_inc(&n_rcu_perf_reader_started); | |
338 | ||
339 | do { | |
340 | local_irq_save(flags); | |
341 | idx = cur_ops->readlock(); | |
342 | cur_ops->readunlock(idx); | |
343 | local_irq_restore(flags); | |
344 | rcu_perf_wait_shutdown(); | |
345 | } while (!torture_must_stop()); | |
346 | torture_kthread_stopping("rcu_perf_reader"); | |
347 | return 0; | |
348 | } | |
349 | ||
350 | /* | |
351 | * RCU perf writer kthread. Repeatedly does a grace period. | |
352 | */ | |
353 | static int | |
354 | rcu_perf_writer(void *arg) | |
355 | { | |
356 | int i = 0; | |
357 | int i_max; | |
358 | long me = (long)arg; | |
2094c995 | 359 | struct sched_param sp; |
8704baab PM |
360 | bool started = false, done = false, alldone = false; |
361 | u64 t; | |
362 | u64 *wdp; | |
363 | u64 *wdpp = writer_durations[me]; | |
364 | ||
365 | VERBOSE_PERFOUT_STRING("rcu_perf_writer task started"); | |
366 | WARN_ON(rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp); | |
367 | WARN_ON(rcu_gp_is_normal() && gp_exp); | |
368 | WARN_ON(!wdpp); | |
6b558c4c | 369 | set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); |
2094c995 PM |
370 | sp.sched_priority = 1; |
371 | sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); | |
df37e66b PM |
372 | |
373 | if (holdoff) | |
374 | schedule_timeout_uninterruptible(holdoff * HZ); | |
375 | ||
8704baab PM |
376 | t = ktime_get_mono_fast_ns(); |
377 | if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) { | |
378 | t_rcu_perf_writer_started = t; | |
379 | if (gp_exp) { | |
380 | b_rcu_perf_writer_started = | |
381 | cur_ops->exp_completed() / 2; | |
382 | } else { | |
383 | b_rcu_perf_writer_started = | |
384 | cur_ops->completed(); | |
385 | } | |
386 | } | |
387 | ||
388 | do { | |
389 | wdp = &wdpp[i]; | |
390 | *wdp = ktime_get_mono_fast_ns(); | |
391 | if (gp_exp) { | |
392 | rcu_perf_writer_state = RTWS_EXP_SYNC; | |
393 | cur_ops->exp_sync(); | |
394 | } else { | |
395 | rcu_perf_writer_state = RTWS_SYNC; | |
396 | cur_ops->sync(); | |
397 | } | |
398 | rcu_perf_writer_state = RTWS_IDLE; | |
399 | t = ktime_get_mono_fast_ns(); | |
400 | *wdp = t - *wdp; | |
401 | i_max = i; | |
402 | if (!started && | |
403 | atomic_read(&n_rcu_perf_writer_started) >= nrealwriters) | |
404 | started = true; | |
405 | if (!done && i >= MIN_MEAS) { | |
406 | done = true; | |
620316e5 PM |
407 | sp.sched_priority = 0; |
408 | sched_setscheduler_nocheck(current, | |
409 | SCHED_NORMAL, &sp); | |
8704baab PM |
410 | pr_alert("%s" PERF_FLAG |
411 | "rcu_perf_writer %ld has %d measurements\n", | |
412 | perf_type, me, MIN_MEAS); | |
413 | if (atomic_inc_return(&n_rcu_perf_writer_finished) >= | |
414 | nrealwriters) { | |
620316e5 | 415 | schedule_timeout_interruptible(10); |
ac2bb275 | 416 | rcu_ftrace_dump(DUMP_ALL); |
8704baab PM |
417 | PERFOUT_STRING("Test complete"); |
418 | t_rcu_perf_writer_finished = t; | |
419 | if (gp_exp) { | |
420 | b_rcu_perf_writer_finished = | |
421 | cur_ops->exp_completed() / 2; | |
422 | } else { | |
423 | b_rcu_perf_writer_finished = | |
424 | cur_ops->completed(); | |
425 | } | |
e6fb1fc1 AS |
426 | if (shutdown) { |
427 | smp_mb(); /* Assign before wake. */ | |
428 | wake_up(&shutdown_wq); | |
429 | } | |
8704baab PM |
430 | } |
431 | } | |
432 | if (done && !alldone && | |
433 | atomic_read(&n_rcu_perf_writer_finished) >= nrealwriters) | |
434 | alldone = true; | |
435 | if (started && !alldone && i < MAX_MEAS - 1) | |
436 | i++; | |
437 | rcu_perf_wait_shutdown(); | |
438 | } while (!torture_must_stop()); | |
439 | rcu_perf_writer_state = RTWS_STOPPING; | |
440 | writer_n_durations[me] = i_max; | |
441 | torture_kthread_stopping("rcu_perf_writer"); | |
442 | return 0; | |
443 | } | |
444 | ||
445 | static inline void | |
446 | rcu_perf_print_module_parms(struct rcu_perf_ops *cur_ops, const char *tag) | |
447 | { | |
448 | pr_alert("%s" PERF_FLAG | |
449 | "--- %s: nreaders=%d nwriters=%d verbose=%d shutdown=%d\n", | |
450 | perf_type, tag, nrealreaders, nrealwriters, verbose, shutdown); | |
451 | } | |
452 | ||
453 | static void | |
454 | rcu_perf_cleanup(void) | |
455 | { | |
456 | int i; | |
457 | int j; | |
458 | int ngps = 0; | |
459 | u64 *wdp; | |
460 | u64 *wdpp; | |
461 | ||
462 | if (torture_cleanup_begin()) | |
463 | return; | |
464 | ||
465 | if (reader_tasks) { | |
466 | for (i = 0; i < nrealreaders; i++) | |
467 | torture_stop_kthread(rcu_perf_reader, | |
468 | reader_tasks[i]); | |
469 | kfree(reader_tasks); | |
470 | } | |
471 | ||
472 | if (writer_tasks) { | |
473 | for (i = 0; i < nrealwriters; i++) { | |
474 | torture_stop_kthread(rcu_perf_writer, | |
475 | writer_tasks[i]); | |
476 | if (!writer_n_durations) | |
477 | continue; | |
478 | j = writer_n_durations[i]; | |
479 | pr_alert("%s%s writer %d gps: %d\n", | |
480 | perf_type, PERF_FLAG, i, j); | |
481 | ngps += j; | |
482 | } | |
483 | pr_alert("%s%s start: %llu end: %llu duration: %llu gps: %d batches: %ld\n", | |
484 | perf_type, PERF_FLAG, | |
485 | t_rcu_perf_writer_started, t_rcu_perf_writer_finished, | |
486 | t_rcu_perf_writer_finished - | |
487 | t_rcu_perf_writer_started, | |
488 | ngps, | |
489 | b_rcu_perf_writer_finished - | |
490 | b_rcu_perf_writer_started); | |
491 | for (i = 0; i < nrealwriters; i++) { | |
492 | if (!writer_durations) | |
493 | break; | |
494 | if (!writer_n_durations) | |
495 | continue; | |
496 | wdpp = writer_durations[i]; | |
497 | if (!wdpp) | |
498 | continue; | |
499 | for (j = 0; j <= writer_n_durations[i]; j++) { | |
500 | wdp = &wdpp[j]; | |
501 | pr_alert("%s%s %4d writer-duration: %5d %llu\n", | |
502 | perf_type, PERF_FLAG, | |
503 | i, j, *wdp); | |
504 | if (j % 100 == 0) | |
505 | schedule_timeout_uninterruptible(1); | |
506 | } | |
507 | kfree(writer_durations[i]); | |
508 | } | |
509 | kfree(writer_tasks); | |
510 | kfree(writer_durations); | |
511 | kfree(writer_n_durations); | |
512 | } | |
513 | ||
514 | /* Do flavor-specific cleanup operations. */ | |
515 | if (cur_ops->cleanup != NULL) | |
516 | cur_ops->cleanup(); | |
517 | ||
518 | torture_cleanup_end(); | |
519 | } | |
520 | ||
521 | /* | |
522 | * Return the number if non-negative. If -1, the number of CPUs. | |
523 | * If less than -1, that much less than the number of CPUs, but | |
524 | * at least one. | |
525 | */ | |
526 | static int compute_real(int n) | |
527 | { | |
528 | int nr; | |
529 | ||
530 | if (n >= 0) { | |
531 | nr = n; | |
532 | } else { | |
533 | nr = num_online_cpus() + 1 + n; | |
534 | if (nr <= 0) | |
535 | nr = 1; | |
536 | } | |
537 | return nr; | |
538 | } | |
539 | ||
540 | /* | |
541 | * RCU perf shutdown kthread. Just waits to be awakened, then shuts | |
542 | * down system. | |
543 | */ | |
544 | static int | |
545 | rcu_perf_shutdown(void *arg) | |
546 | { | |
547 | do { | |
548 | wait_event(shutdown_wq, | |
549 | atomic_read(&n_rcu_perf_writer_finished) >= | |
550 | nrealwriters); | |
551 | } while (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters); | |
552 | smp_mb(); /* Wake before output. */ | |
553 | rcu_perf_cleanup(); | |
554 | kernel_power_off(); | |
555 | return -EINVAL; | |
556 | } | |
557 | ||
558 | static int __init | |
559 | rcu_perf_init(void) | |
560 | { | |
561 | long i; | |
562 | int firsterr = 0; | |
563 | static struct rcu_perf_ops *perf_ops[] = { | |
564 | &rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops, | |
565 | RCUPERF_TASKS_OPS | |
566 | }; | |
567 | ||
568 | if (!torture_init_begin(perf_type, verbose, &perf_runnable)) | |
569 | return -EBUSY; | |
570 | ||
571 | /* Process args and tell the world that the perf'er is on the job. */ | |
572 | for (i = 0; i < ARRAY_SIZE(perf_ops); i++) { | |
573 | cur_ops = perf_ops[i]; | |
574 | if (strcmp(perf_type, cur_ops->name) == 0) | |
575 | break; | |
576 | } | |
577 | if (i == ARRAY_SIZE(perf_ops)) { | |
578 | pr_alert("rcu-perf: invalid perf type: \"%s\"\n", | |
579 | perf_type); | |
580 | pr_alert("rcu-perf types:"); | |
581 | for (i = 0; i < ARRAY_SIZE(perf_ops); i++) | |
582 | pr_alert(" %s", perf_ops[i]->name); | |
583 | pr_alert("\n"); | |
584 | firsterr = -EINVAL; | |
585 | goto unwind; | |
586 | } | |
587 | if (cur_ops->init) | |
588 | cur_ops->init(); | |
589 | ||
590 | nrealwriters = compute_real(nwriters); | |
591 | nrealreaders = compute_real(nreaders); | |
592 | atomic_set(&n_rcu_perf_reader_started, 0); | |
593 | atomic_set(&n_rcu_perf_writer_started, 0); | |
594 | atomic_set(&n_rcu_perf_writer_finished, 0); | |
595 | rcu_perf_print_module_parms(cur_ops, "Start of test"); | |
596 | ||
597 | /* Start up the kthreads. */ | |
598 | ||
599 | if (shutdown) { | |
600 | init_waitqueue_head(&shutdown_wq); | |
601 | firsterr = torture_create_kthread(rcu_perf_shutdown, NULL, | |
602 | shutdown_task); | |
603 | if (firsterr) | |
604 | goto unwind; | |
605 | schedule_timeout_uninterruptible(1); | |
606 | } | |
607 | reader_tasks = kcalloc(nrealreaders, sizeof(reader_tasks[0]), | |
608 | GFP_KERNEL); | |
609 | if (reader_tasks == NULL) { | |
610 | VERBOSE_PERFOUT_ERRSTRING("out of memory"); | |
611 | firsterr = -ENOMEM; | |
612 | goto unwind; | |
613 | } | |
614 | for (i = 0; i < nrealreaders; i++) { | |
6b558c4c | 615 | firsterr = torture_create_kthread(rcu_perf_reader, (void *)i, |
8704baab PM |
616 | reader_tasks[i]); |
617 | if (firsterr) | |
618 | goto unwind; | |
619 | } | |
620 | while (atomic_read(&n_rcu_perf_reader_started) < nrealreaders) | |
621 | schedule_timeout_uninterruptible(1); | |
622 | writer_tasks = kcalloc(nrealwriters, sizeof(reader_tasks[0]), | |
623 | GFP_KERNEL); | |
624 | writer_durations = kcalloc(nrealwriters, sizeof(*writer_durations), | |
625 | GFP_KERNEL); | |
626 | writer_n_durations = | |
627 | kcalloc(nrealwriters, sizeof(*writer_n_durations), | |
628 | GFP_KERNEL); | |
629 | if (!writer_tasks || !writer_durations || !writer_n_durations) { | |
630 | VERBOSE_PERFOUT_ERRSTRING("out of memory"); | |
631 | firsterr = -ENOMEM; | |
632 | goto unwind; | |
633 | } | |
634 | for (i = 0; i < nrealwriters; i++) { | |
635 | writer_durations[i] = | |
636 | kcalloc(MAX_MEAS, sizeof(*writer_durations[i]), | |
637 | GFP_KERNEL); | |
638 | if (!writer_durations[i]) | |
639 | goto unwind; | |
640 | firsterr = torture_create_kthread(rcu_perf_writer, (void *)i, | |
641 | writer_tasks[i]); | |
642 | if (firsterr) | |
643 | goto unwind; | |
644 | } | |
645 | torture_init_end(); | |
646 | return 0; | |
647 | ||
648 | unwind: | |
649 | torture_init_end(); | |
650 | rcu_perf_cleanup(); | |
651 | return firsterr; | |
652 | } | |
653 | ||
654 | module_init(rcu_perf_init); | |
655 | module_exit(rcu_perf_cleanup); |