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8bf05ed3 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
8704baab PM |
2 | /* |
3 | * Read-Copy Update module-based performance-test facility | |
4 | * | |
8704baab PM |
5 | * Copyright (C) IBM Corporation, 2015 |
6 | * | |
8bf05ed3 | 7 | * Authors: Paul E. McKenney <paulmck@linux.ibm.com> |
8704baab | 8 | */ |
60500037 PM |
9 | |
10 | #define pr_fmt(fmt) fmt | |
11 | ||
8704baab PM |
12 | #include <linux/types.h> |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/kthread.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/smp.h> | |
20 | #include <linux/rcupdate.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/sched.h> | |
ae7e81c0 | 23 | #include <uapi/linux/sched/types.h> |
8704baab PM |
24 | #include <linux/atomic.h> |
25 | #include <linux/bitops.h> | |
26 | #include <linux/completion.h> | |
27 | #include <linux/moduleparam.h> | |
28 | #include <linux/percpu.h> | |
29 | #include <linux/notifier.h> | |
30 | #include <linux/reboot.h> | |
31 | #include <linux/freezer.h> | |
32 | #include <linux/cpu.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/stat.h> | |
35 | #include <linux/srcu.h> | |
36 | #include <linux/slab.h> | |
37 | #include <asm/byteorder.h> | |
38 | #include <linux/torture.h> | |
39 | #include <linux/vmalloc.h> | |
40 | ||
25c36329 PM |
41 | #include "rcu.h" |
42 | ||
8704baab | 43 | MODULE_LICENSE("GPL"); |
8bf05ed3 | 44 | MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com>"); |
8704baab PM |
45 | |
46 | #define PERF_FLAG "-perf:" | |
47 | #define PERFOUT_STRING(s) \ | |
a56fefa2 | 48 | pr_alert("%s" PERF_FLAG " %s\n", perf_type, s) |
8704baab PM |
49 | #define VERBOSE_PERFOUT_STRING(s) \ |
50 | do { if (verbose) pr_alert("%s" PERF_FLAG " %s\n", perf_type, s); } while (0) | |
51 | #define VERBOSE_PERFOUT_ERRSTRING(s) \ | |
52 | do { if (verbose) pr_alert("%s" PERF_FLAG "!!! %s\n", perf_type, s); } while (0) | |
53 | ||
85ba6bfe PM |
54 | /* |
55 | * The intended use cases for the nreaders and nwriters module parameters | |
56 | * are as follows: | |
57 | * | |
58 | * 1. Specify only the nr_cpus kernel boot parameter. This will | |
59 | * set both nreaders and nwriters to the value specified by | |
60 | * nr_cpus for a mixed reader/writer test. | |
61 | * | |
62 | * 2. Specify the nr_cpus kernel boot parameter, but set | |
63 | * rcuperf.nreaders to zero. This will set nwriters to the | |
64 | * value specified by nr_cpus for an update-only test. | |
65 | * | |
66 | * 3. Specify the nr_cpus kernel boot parameter, but set | |
67 | * rcuperf.nwriters to zero. This will set nreaders to the | |
68 | * value specified by nr_cpus for a read-only test. | |
69 | * | |
70 | * Various other use cases may of course be specified. | |
71 | */ | |
72 | ||
e838a7d6 PM |
73 | #ifdef MODULE |
74 | # define RCUPERF_SHUTDOWN 0 | |
75 | #else | |
76 | # define RCUPERF_SHUTDOWN 1 | |
77 | #endif | |
78 | ||
881ed593 PM |
79 | torture_param(bool, gp_async, false, "Use asynchronous GP wait primitives"); |
80 | torture_param(int, gp_async_max, 1000, "Max # outstanding waits per reader"); | |
af06d4f7 | 81 | torture_param(bool, gp_exp, false, "Use expedited GP wait primitives"); |
df37e66b | 82 | torture_param(int, holdoff, 10, "Holdoff time before test start (s)"); |
85ba6bfe | 83 | torture_param(int, nreaders, -1, "Number of RCU reader threads"); |
8704baab | 84 | torture_param(int, nwriters, -1, "Number of RCU updater threads"); |
e838a7d6 | 85 | torture_param(bool, shutdown, RCUPERF_SHUTDOWN, |
492b95e5 | 86 | "Shutdown at end of performance tests."); |
90127d60 | 87 | torture_param(int, verbose, 1, "Enable verbose debugging printk()s"); |
820687a7 | 88 | torture_param(int, writer_holdoff, 0, "Holdoff (us) between GPs, zero to disable"); |
8704baab PM |
89 | |
90 | static char *perf_type = "rcu"; | |
91 | module_param(perf_type, charp, 0444); | |
92 | MODULE_PARM_DESC(perf_type, "Type of RCU to performance-test (rcu, rcu_bh, ...)"); | |
93 | ||
94 | static int nrealreaders; | |
95 | static int nrealwriters; | |
96 | static struct task_struct **writer_tasks; | |
97 | static struct task_struct **reader_tasks; | |
98 | static struct task_struct *shutdown_task; | |
99 | ||
100 | static u64 **writer_durations; | |
101 | static int *writer_n_durations; | |
102 | static atomic_t n_rcu_perf_reader_started; | |
103 | static atomic_t n_rcu_perf_writer_started; | |
104 | static atomic_t n_rcu_perf_writer_finished; | |
105 | static wait_queue_head_t shutdown_wq; | |
106 | static u64 t_rcu_perf_writer_started; | |
107 | static u64 t_rcu_perf_writer_finished; | |
108 | static unsigned long b_rcu_perf_writer_started; | |
109 | static unsigned long b_rcu_perf_writer_finished; | |
881ed593 | 110 | static DEFINE_PER_CPU(atomic_t, n_async_inflight); |
8704baab PM |
111 | |
112 | static int rcu_perf_writer_state; | |
113 | #define RTWS_INIT 0 | |
881ed593 PM |
114 | #define RTWS_ASYNC 1 |
115 | #define RTWS_BARRIER 2 | |
116 | #define RTWS_EXP_SYNC 3 | |
117 | #define RTWS_SYNC 4 | |
118 | #define RTWS_IDLE 5 | |
119 | #define RTWS_STOPPING 6 | |
8704baab PM |
120 | |
121 | #define MAX_MEAS 10000 | |
122 | #define MIN_MEAS 100 | |
123 | ||
8704baab PM |
124 | /* |
125 | * Operations vector for selecting different types of tests. | |
126 | */ | |
127 | ||
128 | struct rcu_perf_ops { | |
129 | int ptype; | |
130 | void (*init)(void); | |
131 | void (*cleanup)(void); | |
132 | int (*readlock)(void); | |
133 | void (*readunlock)(int idx); | |
17ef2fe9 | 134 | unsigned long (*get_gp_seq)(void); |
d7219312 | 135 | unsigned long (*gp_diff)(unsigned long new, unsigned long old); |
8704baab | 136 | unsigned long (*exp_completed)(void); |
881ed593 PM |
137 | void (*async)(struct rcu_head *head, rcu_callback_t func); |
138 | void (*gp_barrier)(void); | |
8704baab PM |
139 | void (*sync)(void); |
140 | void (*exp_sync)(void); | |
141 | const char *name; | |
142 | }; | |
143 | ||
144 | static struct rcu_perf_ops *cur_ops; | |
145 | ||
146 | /* | |
147 | * Definitions for rcu perf testing. | |
148 | */ | |
149 | ||
150 | static int rcu_perf_read_lock(void) __acquires(RCU) | |
151 | { | |
152 | rcu_read_lock(); | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static void rcu_perf_read_unlock(int idx) __releases(RCU) | |
157 | { | |
158 | rcu_read_unlock(); | |
159 | } | |
160 | ||
161 | static unsigned long __maybe_unused rcu_no_completed(void) | |
162 | { | |
163 | return 0; | |
164 | } | |
165 | ||
166 | static void rcu_sync_perf_init(void) | |
167 | { | |
168 | } | |
169 | ||
170 | static struct rcu_perf_ops rcu_ops = { | |
171 | .ptype = RCU_FLAVOR, | |
172 | .init = rcu_sync_perf_init, | |
173 | .readlock = rcu_perf_read_lock, | |
174 | .readunlock = rcu_perf_read_unlock, | |
17ef2fe9 | 175 | .get_gp_seq = rcu_get_gp_seq, |
d7219312 | 176 | .gp_diff = rcu_seq_diff, |
8704baab | 177 | .exp_completed = rcu_exp_batches_completed, |
881ed593 PM |
178 | .async = call_rcu, |
179 | .gp_barrier = rcu_barrier, | |
8704baab PM |
180 | .sync = synchronize_rcu, |
181 | .exp_sync = synchronize_rcu_expedited, | |
182 | .name = "rcu" | |
183 | }; | |
184 | ||
8704baab PM |
185 | /* |
186 | * Definitions for srcu perf testing. | |
187 | */ | |
188 | ||
189 | DEFINE_STATIC_SRCU(srcu_ctl_perf); | |
190 | static struct srcu_struct *srcu_ctlp = &srcu_ctl_perf; | |
191 | ||
192 | static int srcu_perf_read_lock(void) __acquires(srcu_ctlp) | |
193 | { | |
194 | return srcu_read_lock(srcu_ctlp); | |
195 | } | |
196 | ||
197 | static void srcu_perf_read_unlock(int idx) __releases(srcu_ctlp) | |
198 | { | |
199 | srcu_read_unlock(srcu_ctlp, idx); | |
200 | } | |
201 | ||
202 | static unsigned long srcu_perf_completed(void) | |
203 | { | |
204 | return srcu_batches_completed(srcu_ctlp); | |
205 | } | |
206 | ||
881ed593 PM |
207 | static void srcu_call_rcu(struct rcu_head *head, rcu_callback_t func) |
208 | { | |
209 | call_srcu(srcu_ctlp, head, func); | |
210 | } | |
211 | ||
212 | static void srcu_rcu_barrier(void) | |
213 | { | |
214 | srcu_barrier(srcu_ctlp); | |
215 | } | |
216 | ||
8704baab PM |
217 | static void srcu_perf_synchronize(void) |
218 | { | |
219 | synchronize_srcu(srcu_ctlp); | |
220 | } | |
221 | ||
222 | static void srcu_perf_synchronize_expedited(void) | |
223 | { | |
224 | synchronize_srcu_expedited(srcu_ctlp); | |
225 | } | |
226 | ||
227 | static struct rcu_perf_ops srcu_ops = { | |
228 | .ptype = SRCU_FLAVOR, | |
229 | .init = rcu_sync_perf_init, | |
230 | .readlock = srcu_perf_read_lock, | |
231 | .readunlock = srcu_perf_read_unlock, | |
17ef2fe9 | 232 | .get_gp_seq = srcu_perf_completed, |
d7219312 | 233 | .gp_diff = rcu_seq_diff, |
8704baab | 234 | .exp_completed = srcu_perf_completed, |
881ed593 PM |
235 | .async = srcu_call_rcu, |
236 | .gp_barrier = srcu_rcu_barrier, | |
8704baab PM |
237 | .sync = srcu_perf_synchronize, |
238 | .exp_sync = srcu_perf_synchronize_expedited, | |
239 | .name = "srcu" | |
240 | }; | |
241 | ||
f60cb4d4 PM |
242 | static struct srcu_struct srcud; |
243 | ||
244 | static void srcu_sync_perf_init(void) | |
245 | { | |
246 | srcu_ctlp = &srcud; | |
247 | init_srcu_struct(srcu_ctlp); | |
248 | } | |
249 | ||
250 | static void srcu_sync_perf_cleanup(void) | |
251 | { | |
252 | cleanup_srcu_struct(srcu_ctlp); | |
253 | } | |
254 | ||
255 | static struct rcu_perf_ops srcud_ops = { | |
256 | .ptype = SRCU_FLAVOR, | |
257 | .init = srcu_sync_perf_init, | |
258 | .cleanup = srcu_sync_perf_cleanup, | |
259 | .readlock = srcu_perf_read_lock, | |
260 | .readunlock = srcu_perf_read_unlock, | |
17ef2fe9 | 261 | .get_gp_seq = srcu_perf_completed, |
d7219312 | 262 | .gp_diff = rcu_seq_diff, |
f60cb4d4 PM |
263 | .exp_completed = srcu_perf_completed, |
264 | .async = srcu_call_rcu, | |
265 | .gp_barrier = srcu_rcu_barrier, | |
266 | .sync = srcu_perf_synchronize, | |
267 | .exp_sync = srcu_perf_synchronize_expedited, | |
268 | .name = "srcud" | |
269 | }; | |
270 | ||
8704baab PM |
271 | /* |
272 | * Definitions for RCU-tasks perf testing. | |
273 | */ | |
274 | ||
275 | static int tasks_perf_read_lock(void) | |
276 | { | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static void tasks_perf_read_unlock(int idx) | |
281 | { | |
282 | } | |
283 | ||
284 | static struct rcu_perf_ops tasks_ops = { | |
285 | .ptype = RCU_TASKS_FLAVOR, | |
286 | .init = rcu_sync_perf_init, | |
287 | .readlock = tasks_perf_read_lock, | |
288 | .readunlock = tasks_perf_read_unlock, | |
17ef2fe9 | 289 | .get_gp_seq = rcu_no_completed, |
d7219312 | 290 | .gp_diff = rcu_seq_diff, |
881ed593 PM |
291 | .async = call_rcu_tasks, |
292 | .gp_barrier = rcu_barrier_tasks, | |
8704baab PM |
293 | .sync = synchronize_rcu_tasks, |
294 | .exp_sync = synchronize_rcu_tasks, | |
295 | .name = "tasks" | |
296 | }; | |
297 | ||
d7219312 PM |
298 | static unsigned long rcuperf_seq_diff(unsigned long new, unsigned long old) |
299 | { | |
300 | if (!cur_ops->gp_diff) | |
301 | return new - old; | |
302 | return cur_ops->gp_diff(new, old); | |
303 | } | |
304 | ||
8704baab PM |
305 | /* |
306 | * If performance tests complete, wait for shutdown to commence. | |
307 | */ | |
308 | static void rcu_perf_wait_shutdown(void) | |
309 | { | |
cee43939 | 310 | cond_resched_tasks_rcu_qs(); |
8704baab PM |
311 | if (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters) |
312 | return; | |
313 | while (!torture_must_stop()) | |
314 | schedule_timeout_uninterruptible(1); | |
315 | } | |
316 | ||
317 | /* | |
318 | * RCU perf reader kthread. Repeatedly does empty RCU read-side | |
319 | * critical section, minimizing update-side interference. | |
320 | */ | |
321 | static int | |
322 | rcu_perf_reader(void *arg) | |
323 | { | |
324 | unsigned long flags; | |
325 | int idx; | |
6b558c4c | 326 | long me = (long)arg; |
8704baab PM |
327 | |
328 | VERBOSE_PERFOUT_STRING("rcu_perf_reader task started"); | |
6b558c4c | 329 | set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); |
8704baab PM |
330 | set_user_nice(current, MAX_NICE); |
331 | atomic_inc(&n_rcu_perf_reader_started); | |
332 | ||
333 | do { | |
334 | local_irq_save(flags); | |
335 | idx = cur_ops->readlock(); | |
336 | cur_ops->readunlock(idx); | |
337 | local_irq_restore(flags); | |
338 | rcu_perf_wait_shutdown(); | |
339 | } while (!torture_must_stop()); | |
340 | torture_kthread_stopping("rcu_perf_reader"); | |
341 | return 0; | |
342 | } | |
343 | ||
881ed593 PM |
344 | /* |
345 | * Callback function for asynchronous grace periods from rcu_perf_writer(). | |
346 | */ | |
347 | static void rcu_perf_async_cb(struct rcu_head *rhp) | |
348 | { | |
349 | atomic_dec(this_cpu_ptr(&n_async_inflight)); | |
350 | kfree(rhp); | |
351 | } | |
352 | ||
8704baab PM |
353 | /* |
354 | * RCU perf writer kthread. Repeatedly does a grace period. | |
355 | */ | |
356 | static int | |
357 | rcu_perf_writer(void *arg) | |
358 | { | |
359 | int i = 0; | |
360 | int i_max; | |
361 | long me = (long)arg; | |
881ed593 | 362 | struct rcu_head *rhp = NULL; |
2094c995 | 363 | struct sched_param sp; |
8704baab PM |
364 | bool started = false, done = false, alldone = false; |
365 | u64 t; | |
366 | u64 *wdp; | |
367 | u64 *wdpp = writer_durations[me]; | |
368 | ||
369 | VERBOSE_PERFOUT_STRING("rcu_perf_writer task started"); | |
8704baab | 370 | WARN_ON(!wdpp); |
6b558c4c | 371 | set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); |
2094c995 PM |
372 | sp.sched_priority = 1; |
373 | sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); | |
df37e66b PM |
374 | |
375 | if (holdoff) | |
376 | schedule_timeout_uninterruptible(holdoff * HZ); | |
377 | ||
8704baab PM |
378 | t = ktime_get_mono_fast_ns(); |
379 | if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) { | |
380 | t_rcu_perf_writer_started = t; | |
381 | if (gp_exp) { | |
382 | b_rcu_perf_writer_started = | |
383 | cur_ops->exp_completed() / 2; | |
384 | } else { | |
17ef2fe9 | 385 | b_rcu_perf_writer_started = cur_ops->get_gp_seq(); |
8704baab PM |
386 | } |
387 | } | |
388 | ||
389 | do { | |
820687a7 PM |
390 | if (writer_holdoff) |
391 | udelay(writer_holdoff); | |
8704baab PM |
392 | wdp = &wdpp[i]; |
393 | *wdp = ktime_get_mono_fast_ns(); | |
881ed593 PM |
394 | if (gp_async) { |
395 | retry: | |
396 | if (!rhp) | |
397 | rhp = kmalloc(sizeof(*rhp), GFP_KERNEL); | |
398 | if (rhp && atomic_read(this_cpu_ptr(&n_async_inflight)) < gp_async_max) { | |
399 | rcu_perf_writer_state = RTWS_ASYNC; | |
400 | atomic_inc(this_cpu_ptr(&n_async_inflight)); | |
401 | cur_ops->async(rhp, rcu_perf_async_cb); | |
402 | rhp = NULL; | |
403 | } else if (!kthread_should_stop()) { | |
404 | rcu_perf_writer_state = RTWS_BARRIER; | |
405 | cur_ops->gp_barrier(); | |
406 | goto retry; | |
407 | } else { | |
408 | kfree(rhp); /* Because we are stopping. */ | |
409 | } | |
410 | } else if (gp_exp) { | |
8704baab PM |
411 | rcu_perf_writer_state = RTWS_EXP_SYNC; |
412 | cur_ops->exp_sync(); | |
413 | } else { | |
414 | rcu_perf_writer_state = RTWS_SYNC; | |
415 | cur_ops->sync(); | |
416 | } | |
417 | rcu_perf_writer_state = RTWS_IDLE; | |
418 | t = ktime_get_mono_fast_ns(); | |
419 | *wdp = t - *wdp; | |
420 | i_max = i; | |
421 | if (!started && | |
422 | atomic_read(&n_rcu_perf_writer_started) >= nrealwriters) | |
423 | started = true; | |
424 | if (!done && i >= MIN_MEAS) { | |
425 | done = true; | |
620316e5 PM |
426 | sp.sched_priority = 0; |
427 | sched_setscheduler_nocheck(current, | |
428 | SCHED_NORMAL, &sp); | |
a56fefa2 SP |
429 | pr_alert("%s%s rcu_perf_writer %ld has %d measurements\n", |
430 | perf_type, PERF_FLAG, me, MIN_MEAS); | |
8704baab PM |
431 | if (atomic_inc_return(&n_rcu_perf_writer_finished) >= |
432 | nrealwriters) { | |
620316e5 | 433 | schedule_timeout_interruptible(10); |
ac2bb275 | 434 | rcu_ftrace_dump(DUMP_ALL); |
8704baab PM |
435 | PERFOUT_STRING("Test complete"); |
436 | t_rcu_perf_writer_finished = t; | |
437 | if (gp_exp) { | |
438 | b_rcu_perf_writer_finished = | |
439 | cur_ops->exp_completed() / 2; | |
440 | } else { | |
441 | b_rcu_perf_writer_finished = | |
17ef2fe9 | 442 | cur_ops->get_gp_seq(); |
8704baab | 443 | } |
e6fb1fc1 AS |
444 | if (shutdown) { |
445 | smp_mb(); /* Assign before wake. */ | |
446 | wake_up(&shutdown_wq); | |
447 | } | |
8704baab PM |
448 | } |
449 | } | |
450 | if (done && !alldone && | |
451 | atomic_read(&n_rcu_perf_writer_finished) >= nrealwriters) | |
452 | alldone = true; | |
453 | if (started && !alldone && i < MAX_MEAS - 1) | |
454 | i++; | |
455 | rcu_perf_wait_shutdown(); | |
456 | } while (!torture_must_stop()); | |
881ed593 PM |
457 | if (gp_async) { |
458 | rcu_perf_writer_state = RTWS_BARRIER; | |
459 | cur_ops->gp_barrier(); | |
460 | } | |
8704baab PM |
461 | rcu_perf_writer_state = RTWS_STOPPING; |
462 | writer_n_durations[me] = i_max; | |
463 | torture_kthread_stopping("rcu_perf_writer"); | |
464 | return 0; | |
465 | } | |
466 | ||
96221795 | 467 | static void |
8704baab PM |
468 | rcu_perf_print_module_parms(struct rcu_perf_ops *cur_ops, const char *tag) |
469 | { | |
470 | pr_alert("%s" PERF_FLAG | |
471 | "--- %s: nreaders=%d nwriters=%d verbose=%d shutdown=%d\n", | |
472 | perf_type, tag, nrealreaders, nrealwriters, verbose, shutdown); | |
473 | } | |
474 | ||
475 | static void | |
476 | rcu_perf_cleanup(void) | |
477 | { | |
478 | int i; | |
479 | int j; | |
480 | int ngps = 0; | |
481 | u64 *wdp; | |
482 | u64 *wdpp; | |
483 | ||
9683937d PM |
484 | /* |
485 | * Would like warning at start, but everything is expedited | |
486 | * during the mid-boot phase, so have to wait till the end. | |
487 | */ | |
488 | if (rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp) | |
489 | VERBOSE_PERFOUT_ERRSTRING("All grace periods expedited, no normal ones to measure!"); | |
490 | if (rcu_gp_is_normal() && gp_exp) | |
491 | VERBOSE_PERFOUT_ERRSTRING("All grace periods normal, no expedited ones to measure!"); | |
881ed593 PM |
492 | if (gp_exp && gp_async) |
493 | VERBOSE_PERFOUT_ERRSTRING("No expedited async GPs, so went with async!"); | |
9683937d | 494 | |
8704baab PM |
495 | if (torture_cleanup_begin()) |
496 | return; | |
ad092c02 PM |
497 | if (!cur_ops) { |
498 | torture_cleanup_end(); | |
499 | return; | |
500 | } | |
8704baab PM |
501 | |
502 | if (reader_tasks) { | |
503 | for (i = 0; i < nrealreaders; i++) | |
504 | torture_stop_kthread(rcu_perf_reader, | |
505 | reader_tasks[i]); | |
506 | kfree(reader_tasks); | |
507 | } | |
508 | ||
509 | if (writer_tasks) { | |
510 | for (i = 0; i < nrealwriters; i++) { | |
511 | torture_stop_kthread(rcu_perf_writer, | |
512 | writer_tasks[i]); | |
513 | if (!writer_n_durations) | |
514 | continue; | |
515 | j = writer_n_durations[i]; | |
516 | pr_alert("%s%s writer %d gps: %d\n", | |
517 | perf_type, PERF_FLAG, i, j); | |
518 | ngps += j; | |
519 | } | |
520 | pr_alert("%s%s start: %llu end: %llu duration: %llu gps: %d batches: %ld\n", | |
521 | perf_type, PERF_FLAG, | |
522 | t_rcu_perf_writer_started, t_rcu_perf_writer_finished, | |
523 | t_rcu_perf_writer_finished - | |
524 | t_rcu_perf_writer_started, | |
525 | ngps, | |
d7219312 PM |
526 | rcuperf_seq_diff(b_rcu_perf_writer_finished, |
527 | b_rcu_perf_writer_started)); | |
8704baab PM |
528 | for (i = 0; i < nrealwriters; i++) { |
529 | if (!writer_durations) | |
530 | break; | |
531 | if (!writer_n_durations) | |
532 | continue; | |
533 | wdpp = writer_durations[i]; | |
534 | if (!wdpp) | |
535 | continue; | |
536 | for (j = 0; j <= writer_n_durations[i]; j++) { | |
537 | wdp = &wdpp[j]; | |
538 | pr_alert("%s%s %4d writer-duration: %5d %llu\n", | |
539 | perf_type, PERF_FLAG, | |
540 | i, j, *wdp); | |
541 | if (j % 100 == 0) | |
542 | schedule_timeout_uninterruptible(1); | |
543 | } | |
544 | kfree(writer_durations[i]); | |
545 | } | |
546 | kfree(writer_tasks); | |
547 | kfree(writer_durations); | |
548 | kfree(writer_n_durations); | |
549 | } | |
550 | ||
620d2460 | 551 | /* Do torture-type-specific cleanup operations. */ |
8704baab PM |
552 | if (cur_ops->cleanup != NULL) |
553 | cur_ops->cleanup(); | |
554 | ||
555 | torture_cleanup_end(); | |
556 | } | |
557 | ||
558 | /* | |
559 | * Return the number if non-negative. If -1, the number of CPUs. | |
560 | * If less than -1, that much less than the number of CPUs, but | |
561 | * at least one. | |
562 | */ | |
563 | static int compute_real(int n) | |
564 | { | |
565 | int nr; | |
566 | ||
567 | if (n >= 0) { | |
568 | nr = n; | |
569 | } else { | |
570 | nr = num_online_cpus() + 1 + n; | |
571 | if (nr <= 0) | |
572 | nr = 1; | |
573 | } | |
574 | return nr; | |
575 | } | |
576 | ||
577 | /* | |
578 | * RCU perf shutdown kthread. Just waits to be awakened, then shuts | |
579 | * down system. | |
580 | */ | |
581 | static int | |
582 | rcu_perf_shutdown(void *arg) | |
583 | { | |
584 | do { | |
585 | wait_event(shutdown_wq, | |
586 | atomic_read(&n_rcu_perf_writer_finished) >= | |
587 | nrealwriters); | |
588 | } while (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters); | |
589 | smp_mb(); /* Wake before output. */ | |
590 | rcu_perf_cleanup(); | |
591 | kernel_power_off(); | |
592 | return -EINVAL; | |
593 | } | |
594 | ||
595 | static int __init | |
596 | rcu_perf_init(void) | |
597 | { | |
598 | long i; | |
599 | int firsterr = 0; | |
600 | static struct rcu_perf_ops *perf_ops[] = { | |
620d2460 | 601 | &rcu_ops, &srcu_ops, &srcud_ops, &tasks_ops, |
8704baab PM |
602 | }; |
603 | ||
a2f2577d | 604 | if (!torture_init_begin(perf_type, verbose)) |
8704baab PM |
605 | return -EBUSY; |
606 | ||
607 | /* Process args and tell the world that the perf'er is on the job. */ | |
608 | for (i = 0; i < ARRAY_SIZE(perf_ops); i++) { | |
609 | cur_ops = perf_ops[i]; | |
610 | if (strcmp(perf_type, cur_ops->name) == 0) | |
611 | break; | |
612 | } | |
613 | if (i == ARRAY_SIZE(perf_ops)) { | |
a7538352 | 614 | pr_alert("rcu-perf: invalid perf type: \"%s\"\n", perf_type); |
8704baab PM |
615 | pr_alert("rcu-perf types:"); |
616 | for (i = 0; i < ARRAY_SIZE(perf_ops); i++) | |
a7538352 JP |
617 | pr_cont(" %s", perf_ops[i]->name); |
618 | pr_cont("\n"); | |
f0288064 | 619 | WARN_ON(!IS_MODULE(CONFIG_RCU_PERF_TEST)); |
8704baab | 620 | firsterr = -EINVAL; |
ad092c02 | 621 | cur_ops = NULL; |
8704baab PM |
622 | goto unwind; |
623 | } | |
624 | if (cur_ops->init) | |
625 | cur_ops->init(); | |
626 | ||
627 | nrealwriters = compute_real(nwriters); | |
628 | nrealreaders = compute_real(nreaders); | |
629 | atomic_set(&n_rcu_perf_reader_started, 0); | |
630 | atomic_set(&n_rcu_perf_writer_started, 0); | |
631 | atomic_set(&n_rcu_perf_writer_finished, 0); | |
632 | rcu_perf_print_module_parms(cur_ops, "Start of test"); | |
633 | ||
634 | /* Start up the kthreads. */ | |
635 | ||
636 | if (shutdown) { | |
637 | init_waitqueue_head(&shutdown_wq); | |
638 | firsterr = torture_create_kthread(rcu_perf_shutdown, NULL, | |
639 | shutdown_task); | |
640 | if (firsterr) | |
641 | goto unwind; | |
642 | schedule_timeout_uninterruptible(1); | |
643 | } | |
644 | reader_tasks = kcalloc(nrealreaders, sizeof(reader_tasks[0]), | |
645 | GFP_KERNEL); | |
646 | if (reader_tasks == NULL) { | |
647 | VERBOSE_PERFOUT_ERRSTRING("out of memory"); | |
648 | firsterr = -ENOMEM; | |
649 | goto unwind; | |
650 | } | |
651 | for (i = 0; i < nrealreaders; i++) { | |
6b558c4c | 652 | firsterr = torture_create_kthread(rcu_perf_reader, (void *)i, |
8704baab PM |
653 | reader_tasks[i]); |
654 | if (firsterr) | |
655 | goto unwind; | |
656 | } | |
657 | while (atomic_read(&n_rcu_perf_reader_started) < nrealreaders) | |
658 | schedule_timeout_uninterruptible(1); | |
659 | writer_tasks = kcalloc(nrealwriters, sizeof(reader_tasks[0]), | |
660 | GFP_KERNEL); | |
661 | writer_durations = kcalloc(nrealwriters, sizeof(*writer_durations), | |
662 | GFP_KERNEL); | |
663 | writer_n_durations = | |
664 | kcalloc(nrealwriters, sizeof(*writer_n_durations), | |
665 | GFP_KERNEL); | |
666 | if (!writer_tasks || !writer_durations || !writer_n_durations) { | |
667 | VERBOSE_PERFOUT_ERRSTRING("out of memory"); | |
668 | firsterr = -ENOMEM; | |
669 | goto unwind; | |
670 | } | |
671 | for (i = 0; i < nrealwriters; i++) { | |
672 | writer_durations[i] = | |
673 | kcalloc(MAX_MEAS, sizeof(*writer_durations[i]), | |
674 | GFP_KERNEL); | |
05dbbfe7 WY |
675 | if (!writer_durations[i]) { |
676 | firsterr = -ENOMEM; | |
8704baab | 677 | goto unwind; |
05dbbfe7 | 678 | } |
8704baab PM |
679 | firsterr = torture_create_kthread(rcu_perf_writer, (void *)i, |
680 | writer_tasks[i]); | |
681 | if (firsterr) | |
682 | goto unwind; | |
683 | } | |
684 | torture_init_end(); | |
685 | return 0; | |
686 | ||
687 | unwind: | |
688 | torture_init_end(); | |
689 | rcu_perf_cleanup(); | |
690 | return firsterr; | |
691 | } | |
692 | ||
693 | module_init(rcu_perf_init); | |
694 | module_exit(rcu_perf_cleanup); |