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a241ec65 | 1 | /* |
29766f1e | 2 | * Read-Copy Update module-based torture test facility |
a241ec65 PM |
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, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
b772e1dd | 18 | * Copyright (C) IBM Corporation, 2005, 2006 |
a241ec65 PM |
19 | * |
20 | * Authors: Paul E. McKenney <paulmck@us.ibm.com> | |
b772e1dd | 21 | * Josh Triplett <josh@freedesktop.org> |
a241ec65 PM |
22 | * |
23 | * See also: Documentation/RCU/torture.txt | |
24 | */ | |
25 | #include <linux/types.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/kthread.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/smp.h> | |
33 | #include <linux/rcupdate.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/sched.h> | |
36 | #include <asm/atomic.h> | |
37 | #include <linux/bitops.h> | |
a241ec65 PM |
38 | #include <linux/completion.h> |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/percpu.h> | |
41 | #include <linux/notifier.h> | |
83144186 | 42 | #include <linux/freezer.h> |
a241ec65 | 43 | #include <linux/cpu.h> |
a241ec65 PM |
44 | #include <linux/delay.h> |
45 | #include <linux/byteorder/swabb.h> | |
46 | #include <linux/stat.h> | |
b2896d2e | 47 | #include <linux/srcu.h> |
1aeb272c | 48 | #include <linux/slab.h> |
a241ec65 PM |
49 | |
50 | MODULE_LICENSE("GPL"); | |
b772e1dd JT |
51 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and " |
52 | "Josh Triplett <josh@freedesktop.org>"); | |
a241ec65 | 53 | |
4802211c | 54 | static int nreaders = -1; /* # reader threads, defaults to 2*ncpus */ |
b772e1dd | 55 | static int nfakewriters = 4; /* # fake writer threads */ |
d84f5203 | 56 | static int stat_interval; /* Interval between stats, in seconds. */ |
a241ec65 | 57 | /* Defaults to "only at end of test". */ |
d84f5203 SV |
58 | static int verbose; /* Print more debug info. */ |
59 | static int test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */ | |
d120f65f PM |
60 | static int shuffle_interval = 3; /* Interval between shuffles (in sec)*/ |
61 | static int stutter = 5; /* Start/stop testing interval (in sec) */ | |
20d2e428 | 62 | static char *torture_type = "rcu"; /* What RCU implementation to torture. */ |
a241ec65 | 63 | |
d6ad6711 | 64 | module_param(nreaders, int, 0444); |
a241ec65 | 65 | MODULE_PARM_DESC(nreaders, "Number of RCU reader threads"); |
d6ad6711 | 66 | module_param(nfakewriters, int, 0444); |
b772e1dd | 67 | MODULE_PARM_DESC(nfakewriters, "Number of RCU fake writer threads"); |
d6ad6711 | 68 | module_param(stat_interval, int, 0444); |
a241ec65 | 69 | MODULE_PARM_DESC(stat_interval, "Number of seconds between stats printk()s"); |
d6ad6711 | 70 | module_param(verbose, bool, 0444); |
a241ec65 | 71 | MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); |
d6ad6711 | 72 | module_param(test_no_idle_hz, bool, 0444); |
d84f5203 | 73 | MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs"); |
d6ad6711 | 74 | module_param(shuffle_interval, int, 0444); |
d84f5203 | 75 | MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles"); |
d120f65f PM |
76 | module_param(stutter, int, 0444); |
77 | MODULE_PARM_DESC(stutter, "Number of seconds to run/halt test"); | |
d6ad6711 | 78 | module_param(torture_type, charp, 0444); |
b2896d2e | 79 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, srcu)"); |
72e9bb54 PM |
80 | |
81 | #define TORTURE_FLAG "-torture:" | |
a241ec65 | 82 | #define PRINTK_STRING(s) \ |
72e9bb54 | 83 | do { printk(KERN_ALERT "%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
a241ec65 | 84 | #define VERBOSE_PRINTK_STRING(s) \ |
72e9bb54 | 85 | do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
a241ec65 | 86 | #define VERBOSE_PRINTK_ERRSTRING(s) \ |
72e9bb54 | 87 | do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG "!!! " s "\n", torture_type); } while (0) |
a241ec65 PM |
88 | |
89 | static char printk_buf[4096]; | |
90 | ||
91 | static int nrealreaders; | |
92 | static struct task_struct *writer_task; | |
b772e1dd | 93 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
94 | static struct task_struct **reader_tasks; |
95 | static struct task_struct *stats_task; | |
d84f5203 | 96 | static struct task_struct *shuffler_task; |
d120f65f | 97 | static struct task_struct *stutter_task; |
a241ec65 PM |
98 | |
99 | #define RCU_TORTURE_PIPE_LEN 10 | |
100 | ||
101 | struct rcu_torture { | |
102 | struct rcu_head rtort_rcu; | |
103 | int rtort_pipe_count; | |
104 | struct list_head rtort_free; | |
996417d2 | 105 | int rtort_mbtest; |
a241ec65 PM |
106 | }; |
107 | ||
108 | static int fullstop = 0; /* stop generating callbacks at test end. */ | |
109 | static LIST_HEAD(rcu_torture_freelist); | |
110 | static struct rcu_torture *rcu_torture_current = NULL; | |
111 | static long rcu_torture_current_version = 0; | |
112 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; | |
113 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
114 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count) = | |
115 | { 0 }; | |
116 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch) = | |
117 | { 0 }; | |
118 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; | |
b2896d2e PM |
119 | static atomic_t n_rcu_torture_alloc; |
120 | static atomic_t n_rcu_torture_alloc_fail; | |
121 | static atomic_t n_rcu_torture_free; | |
122 | static atomic_t n_rcu_torture_mberror; | |
123 | static atomic_t n_rcu_torture_error; | |
e3033736 | 124 | static struct list_head rcu_torture_removed; |
a241ec65 | 125 | |
d120f65f PM |
126 | static int stutter_pause_test = 0; |
127 | ||
31a72bce PM |
128 | #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) |
129 | #define RCUTORTURE_RUNNABLE_INIT 1 | |
130 | #else | |
131 | #define RCUTORTURE_RUNNABLE_INIT 0 | |
132 | #endif | |
133 | int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT; | |
134 | ||
a241ec65 PM |
135 | /* |
136 | * Allocate an element from the rcu_tortures pool. | |
137 | */ | |
97a41e26 | 138 | static struct rcu_torture * |
a241ec65 PM |
139 | rcu_torture_alloc(void) |
140 | { | |
141 | struct list_head *p; | |
142 | ||
adac1665 | 143 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
144 | if (list_empty(&rcu_torture_freelist)) { |
145 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 146 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
147 | return NULL; |
148 | } | |
149 | atomic_inc(&n_rcu_torture_alloc); | |
150 | p = rcu_torture_freelist.next; | |
151 | list_del_init(p); | |
adac1665 | 152 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
153 | return container_of(p, struct rcu_torture, rtort_free); |
154 | } | |
155 | ||
156 | /* | |
157 | * Free an element to the rcu_tortures pool. | |
158 | */ | |
159 | static void | |
160 | rcu_torture_free(struct rcu_torture *p) | |
161 | { | |
162 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 163 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 164 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 165 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
166 | } |
167 | ||
a241ec65 PM |
168 | struct rcu_random_state { |
169 | unsigned long rrs_state; | |
75cfef32 | 170 | long rrs_count; |
a241ec65 PM |
171 | }; |
172 | ||
173 | #define RCU_RANDOM_MULT 39916801 /* prime */ | |
174 | #define RCU_RANDOM_ADD 479001701 /* prime */ | |
175 | #define RCU_RANDOM_REFRESH 10000 | |
176 | ||
177 | #define DEFINE_RCU_RANDOM(name) struct rcu_random_state name = { 0, 0 } | |
178 | ||
179 | /* | |
180 | * Crude but fast random-number generator. Uses a linear congruential | |
c17ac855 | 181 | * generator, with occasional help from cpu_clock(). |
a241ec65 | 182 | */ |
75cfef32 | 183 | static unsigned long |
a241ec65 PM |
184 | rcu_random(struct rcu_random_state *rrsp) |
185 | { | |
a241ec65 | 186 | if (--rrsp->rrs_count < 0) { |
c17ac855 PM |
187 | rrsp->rrs_state += |
188 | (unsigned long)cpu_clock(raw_smp_processor_id()); | |
a241ec65 PM |
189 | rrsp->rrs_count = RCU_RANDOM_REFRESH; |
190 | } | |
191 | rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD; | |
192 | return swahw32(rrsp->rrs_state); | |
193 | } | |
194 | ||
d120f65f PM |
195 | static void |
196 | rcu_stutter_wait(void) | |
197 | { | |
31a72bce | 198 | while (stutter_pause_test || !rcutorture_runnable) |
d120f65f PM |
199 | schedule_timeout_interruptible(1); |
200 | } | |
201 | ||
72e9bb54 PM |
202 | /* |
203 | * Operations vector for selecting different types of tests. | |
204 | */ | |
205 | ||
206 | struct rcu_torture_ops { | |
207 | void (*init)(void); | |
208 | void (*cleanup)(void); | |
209 | int (*readlock)(void); | |
b2896d2e | 210 | void (*readdelay)(struct rcu_random_state *rrsp); |
72e9bb54 PM |
211 | void (*readunlock)(int idx); |
212 | int (*completed)(void); | |
213 | void (*deferredfree)(struct rcu_torture *p); | |
b772e1dd | 214 | void (*sync)(void); |
2326974d | 215 | void (*cb_barrier)(void); |
72e9bb54 PM |
216 | int (*stats)(char *page); |
217 | char *name; | |
218 | }; | |
219 | static struct rcu_torture_ops *cur_ops = NULL; | |
220 | ||
221 | /* | |
222 | * Definitions for rcu torture testing. | |
223 | */ | |
224 | ||
a49a4af7 | 225 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
226 | { |
227 | rcu_read_lock(); | |
228 | return 0; | |
229 | } | |
230 | ||
b2896d2e PM |
231 | static void rcu_read_delay(struct rcu_random_state *rrsp) |
232 | { | |
233 | long delay; | |
234 | const long longdelay = 200; | |
235 | ||
236 | /* We want there to be long-running readers, but not all the time. */ | |
237 | ||
238 | delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay); | |
239 | if (!delay) | |
240 | udelay(longdelay); | |
241 | } | |
242 | ||
a49a4af7 | 243 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
244 | { |
245 | rcu_read_unlock(); | |
246 | } | |
247 | ||
248 | static int rcu_torture_completed(void) | |
249 | { | |
250 | return rcu_batches_completed(); | |
251 | } | |
252 | ||
253 | static void | |
254 | rcu_torture_cb(struct rcu_head *p) | |
255 | { | |
256 | int i; | |
257 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); | |
258 | ||
259 | if (fullstop) { | |
260 | /* Test is ending, just drop callbacks on the floor. */ | |
261 | /* The next initialization will pick up the pieces. */ | |
262 | return; | |
263 | } | |
264 | i = rp->rtort_pipe_count; | |
265 | if (i > RCU_TORTURE_PIPE_LEN) | |
266 | i = RCU_TORTURE_PIPE_LEN; | |
267 | atomic_inc(&rcu_torture_wcount[i]); | |
268 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
269 | rp->rtort_mbtest = 0; | |
270 | rcu_torture_free(rp); | |
271 | } else | |
272 | cur_ops->deferredfree(rp); | |
273 | } | |
274 | ||
275 | static void rcu_torture_deferred_free(struct rcu_torture *p) | |
276 | { | |
277 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
278 | } | |
279 | ||
280 | static struct rcu_torture_ops rcu_ops = { | |
281 | .init = NULL, | |
282 | .cleanup = NULL, | |
283 | .readlock = rcu_torture_read_lock, | |
b2896d2e | 284 | .readdelay = rcu_read_delay, |
72e9bb54 PM |
285 | .readunlock = rcu_torture_read_unlock, |
286 | .completed = rcu_torture_completed, | |
287 | .deferredfree = rcu_torture_deferred_free, | |
b772e1dd | 288 | .sync = synchronize_rcu, |
2326974d | 289 | .cb_barrier = rcu_barrier, |
72e9bb54 PM |
290 | .stats = NULL, |
291 | .name = "rcu" | |
292 | }; | |
293 | ||
e3033736 JT |
294 | static void rcu_sync_torture_deferred_free(struct rcu_torture *p) |
295 | { | |
296 | int i; | |
297 | struct rcu_torture *rp; | |
298 | struct rcu_torture *rp1; | |
299 | ||
300 | cur_ops->sync(); | |
301 | list_add(&p->rtort_free, &rcu_torture_removed); | |
302 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
303 | i = rp->rtort_pipe_count; | |
304 | if (i > RCU_TORTURE_PIPE_LEN) | |
305 | i = RCU_TORTURE_PIPE_LEN; | |
306 | atomic_inc(&rcu_torture_wcount[i]); | |
307 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
308 | rp->rtort_mbtest = 0; | |
309 | list_del(&rp->rtort_free); | |
310 | rcu_torture_free(rp); | |
311 | } | |
312 | } | |
313 | } | |
314 | ||
315 | static void rcu_sync_torture_init(void) | |
316 | { | |
317 | INIT_LIST_HEAD(&rcu_torture_removed); | |
318 | } | |
319 | ||
20d2e428 JT |
320 | static struct rcu_torture_ops rcu_sync_ops = { |
321 | .init = rcu_sync_torture_init, | |
322 | .cleanup = NULL, | |
323 | .readlock = rcu_torture_read_lock, | |
324 | .readdelay = rcu_read_delay, | |
325 | .readunlock = rcu_torture_read_unlock, | |
326 | .completed = rcu_torture_completed, | |
327 | .deferredfree = rcu_sync_torture_deferred_free, | |
328 | .sync = synchronize_rcu, | |
2326974d | 329 | .cb_barrier = NULL, |
20d2e428 JT |
330 | .stats = NULL, |
331 | .name = "rcu_sync" | |
332 | }; | |
333 | ||
c32e0660 PM |
334 | /* |
335 | * Definitions for rcu_bh torture testing. | |
336 | */ | |
337 | ||
a49a4af7 | 338 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
339 | { |
340 | rcu_read_lock_bh(); | |
341 | return 0; | |
342 | } | |
343 | ||
a49a4af7 | 344 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
345 | { |
346 | rcu_read_unlock_bh(); | |
347 | } | |
348 | ||
349 | static int rcu_bh_torture_completed(void) | |
350 | { | |
351 | return rcu_batches_completed_bh(); | |
352 | } | |
353 | ||
354 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) | |
355 | { | |
356 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
357 | } | |
358 | ||
b772e1dd JT |
359 | struct rcu_bh_torture_synchronize { |
360 | struct rcu_head head; | |
361 | struct completion completion; | |
362 | }; | |
363 | ||
364 | static void rcu_bh_torture_wakeme_after_cb(struct rcu_head *head) | |
365 | { | |
366 | struct rcu_bh_torture_synchronize *rcu; | |
367 | ||
368 | rcu = container_of(head, struct rcu_bh_torture_synchronize, head); | |
369 | complete(&rcu->completion); | |
370 | } | |
371 | ||
372 | static void rcu_bh_torture_synchronize(void) | |
373 | { | |
374 | struct rcu_bh_torture_synchronize rcu; | |
375 | ||
376 | init_completion(&rcu.completion); | |
377 | call_rcu_bh(&rcu.head, rcu_bh_torture_wakeme_after_cb); | |
378 | wait_for_completion(&rcu.completion); | |
379 | } | |
380 | ||
c32e0660 PM |
381 | static struct rcu_torture_ops rcu_bh_ops = { |
382 | .init = NULL, | |
383 | .cleanup = NULL, | |
384 | .readlock = rcu_bh_torture_read_lock, | |
b2896d2e | 385 | .readdelay = rcu_read_delay, /* just reuse rcu's version. */ |
c32e0660 PM |
386 | .readunlock = rcu_bh_torture_read_unlock, |
387 | .completed = rcu_bh_torture_completed, | |
388 | .deferredfree = rcu_bh_torture_deferred_free, | |
b772e1dd | 389 | .sync = rcu_bh_torture_synchronize, |
2326974d | 390 | .cb_barrier = rcu_barrier_bh, |
c32e0660 PM |
391 | .stats = NULL, |
392 | .name = "rcu_bh" | |
393 | }; | |
394 | ||
11a14701 JT |
395 | static struct rcu_torture_ops rcu_bh_sync_ops = { |
396 | .init = rcu_sync_torture_init, | |
397 | .cleanup = NULL, | |
398 | .readlock = rcu_bh_torture_read_lock, | |
399 | .readdelay = rcu_read_delay, /* just reuse rcu's version. */ | |
400 | .readunlock = rcu_bh_torture_read_unlock, | |
401 | .completed = rcu_bh_torture_completed, | |
402 | .deferredfree = rcu_sync_torture_deferred_free, | |
403 | .sync = rcu_bh_torture_synchronize, | |
2326974d | 404 | .cb_barrier = NULL, |
11a14701 JT |
405 | .stats = NULL, |
406 | .name = "rcu_bh_sync" | |
407 | }; | |
408 | ||
b2896d2e PM |
409 | /* |
410 | * Definitions for srcu torture testing. | |
411 | */ | |
412 | ||
413 | static struct srcu_struct srcu_ctl; | |
b2896d2e PM |
414 | |
415 | static void srcu_torture_init(void) | |
416 | { | |
417 | init_srcu_struct(&srcu_ctl); | |
e3033736 | 418 | rcu_sync_torture_init(); |
b2896d2e PM |
419 | } |
420 | ||
421 | static void srcu_torture_cleanup(void) | |
422 | { | |
423 | synchronize_srcu(&srcu_ctl); | |
424 | cleanup_srcu_struct(&srcu_ctl); | |
425 | } | |
426 | ||
012d3ca8 | 427 | static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e PM |
428 | { |
429 | return srcu_read_lock(&srcu_ctl); | |
430 | } | |
431 | ||
432 | static void srcu_read_delay(struct rcu_random_state *rrsp) | |
433 | { | |
434 | long delay; | |
435 | const long uspertick = 1000000 / HZ; | |
436 | const long longdelay = 10; | |
437 | ||
438 | /* We want there to be long-running readers, but not all the time. */ | |
439 | ||
440 | delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick); | |
441 | if (!delay) | |
442 | schedule_timeout_interruptible(longdelay); | |
443 | } | |
444 | ||
012d3ca8 | 445 | static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e PM |
446 | { |
447 | srcu_read_unlock(&srcu_ctl, idx); | |
448 | } | |
449 | ||
450 | static int srcu_torture_completed(void) | |
451 | { | |
452 | return srcu_batches_completed(&srcu_ctl); | |
453 | } | |
454 | ||
b772e1dd JT |
455 | static void srcu_torture_synchronize(void) |
456 | { | |
457 | synchronize_srcu(&srcu_ctl); | |
458 | } | |
459 | ||
b2896d2e PM |
460 | static int srcu_torture_stats(char *page) |
461 | { | |
462 | int cnt = 0; | |
463 | int cpu; | |
464 | int idx = srcu_ctl.completed & 0x1; | |
465 | ||
466 | cnt += sprintf(&page[cnt], "%s%s per-CPU(idx=%d):", | |
467 | torture_type, TORTURE_FLAG, idx); | |
468 | for_each_possible_cpu(cpu) { | |
469 | cnt += sprintf(&page[cnt], " %d(%d,%d)", cpu, | |
470 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], | |
471 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); | |
472 | } | |
473 | cnt += sprintf(&page[cnt], "\n"); | |
474 | return cnt; | |
475 | } | |
476 | ||
477 | static struct rcu_torture_ops srcu_ops = { | |
478 | .init = srcu_torture_init, | |
479 | .cleanup = srcu_torture_cleanup, | |
480 | .readlock = srcu_torture_read_lock, | |
481 | .readdelay = srcu_read_delay, | |
482 | .readunlock = srcu_torture_read_unlock, | |
483 | .completed = srcu_torture_completed, | |
e3033736 | 484 | .deferredfree = rcu_sync_torture_deferred_free, |
b772e1dd | 485 | .sync = srcu_torture_synchronize, |
2326974d | 486 | .cb_barrier = NULL, |
b2896d2e PM |
487 | .stats = srcu_torture_stats, |
488 | .name = "srcu" | |
489 | }; | |
490 | ||
4b6c2cca JT |
491 | /* |
492 | * Definitions for sched torture testing. | |
493 | */ | |
494 | ||
495 | static int sched_torture_read_lock(void) | |
496 | { | |
497 | preempt_disable(); | |
498 | return 0; | |
499 | } | |
500 | ||
501 | static void sched_torture_read_unlock(int idx) | |
502 | { | |
503 | preempt_enable(); | |
504 | } | |
505 | ||
506 | static int sched_torture_completed(void) | |
507 | { | |
508 | return 0; | |
509 | } | |
510 | ||
2326974d PM |
511 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
512 | { | |
513 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
514 | } | |
515 | ||
4b6c2cca JT |
516 | static void sched_torture_synchronize(void) |
517 | { | |
518 | synchronize_sched(); | |
519 | } | |
520 | ||
521 | static struct rcu_torture_ops sched_ops = { | |
522 | .init = rcu_sync_torture_init, | |
523 | .cleanup = NULL, | |
524 | .readlock = sched_torture_read_lock, | |
525 | .readdelay = rcu_read_delay, /* just reuse rcu's version. */ | |
526 | .readunlock = sched_torture_read_unlock, | |
527 | .completed = sched_torture_completed, | |
2326974d | 528 | .deferredfree = rcu_sched_torture_deferred_free, |
4b6c2cca | 529 | .sync = sched_torture_synchronize, |
2326974d | 530 | .cb_barrier = rcu_barrier_sched, |
4b6c2cca JT |
531 | .stats = NULL, |
532 | .name = "sched" | |
533 | }; | |
534 | ||
2326974d PM |
535 | static struct rcu_torture_ops sched_ops_sync = { |
536 | .init = rcu_sync_torture_init, | |
537 | .cleanup = NULL, | |
538 | .readlock = sched_torture_read_lock, | |
539 | .readdelay = rcu_read_delay, /* just reuse rcu's version. */ | |
540 | .readunlock = sched_torture_read_unlock, | |
541 | .completed = sched_torture_completed, | |
542 | .deferredfree = rcu_sync_torture_deferred_free, | |
543 | .sync = sched_torture_synchronize, | |
544 | .cb_barrier = NULL, | |
545 | .stats = NULL, | |
546 | .name = "sched_sync" | |
547 | }; | |
548 | ||
a241ec65 PM |
549 | /* |
550 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
551 | * for that pointed to by rcu_torture_current, freeing the old structure | |
552 | * after a series of grace periods (the "pipeline"). | |
553 | */ | |
554 | static int | |
555 | rcu_torture_writer(void *arg) | |
556 | { | |
557 | int i; | |
558 | long oldbatch = rcu_batches_completed(); | |
559 | struct rcu_torture *rp; | |
560 | struct rcu_torture *old_rp; | |
561 | static DEFINE_RCU_RANDOM(rand); | |
562 | ||
563 | VERBOSE_PRINTK_STRING("rcu_torture_writer task started"); | |
dbdf65b1 IM |
564 | set_user_nice(current, 19); |
565 | ||
a241ec65 PM |
566 | do { |
567 | schedule_timeout_uninterruptible(1); | |
a241ec65 PM |
568 | if ((rp = rcu_torture_alloc()) == NULL) |
569 | continue; | |
570 | rp->rtort_pipe_count = 0; | |
571 | udelay(rcu_random(&rand) & 0x3ff); | |
572 | old_rp = rcu_torture_current; | |
996417d2 | 573 | rp->rtort_mbtest = 1; |
a241ec65 PM |
574 | rcu_assign_pointer(rcu_torture_current, rp); |
575 | smp_wmb(); | |
c8e5b163 | 576 | if (old_rp) { |
a241ec65 PM |
577 | i = old_rp->rtort_pipe_count; |
578 | if (i > RCU_TORTURE_PIPE_LEN) | |
579 | i = RCU_TORTURE_PIPE_LEN; | |
580 | atomic_inc(&rcu_torture_wcount[i]); | |
581 | old_rp->rtort_pipe_count++; | |
72e9bb54 | 582 | cur_ops->deferredfree(old_rp); |
a241ec65 PM |
583 | } |
584 | rcu_torture_current_version++; | |
72e9bb54 | 585 | oldbatch = cur_ops->completed(); |
d120f65f | 586 | rcu_stutter_wait(); |
a241ec65 PM |
587 | } while (!kthread_should_stop() && !fullstop); |
588 | VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping"); | |
589 | while (!kthread_should_stop()) | |
590 | schedule_timeout_uninterruptible(1); | |
591 | return 0; | |
592 | } | |
593 | ||
b772e1dd JT |
594 | /* |
595 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
596 | * delay between calls. | |
597 | */ | |
598 | static int | |
599 | rcu_torture_fakewriter(void *arg) | |
600 | { | |
601 | DEFINE_RCU_RANDOM(rand); | |
602 | ||
603 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started"); | |
604 | set_user_nice(current, 19); | |
605 | ||
606 | do { | |
607 | schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10); | |
608 | udelay(rcu_random(&rand) & 0x3ff); | |
609 | cur_ops->sync(); | |
d120f65f | 610 | rcu_stutter_wait(); |
b772e1dd JT |
611 | } while (!kthread_should_stop() && !fullstop); |
612 | ||
613 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); | |
614 | while (!kthread_should_stop()) | |
615 | schedule_timeout_uninterruptible(1); | |
616 | return 0; | |
617 | } | |
618 | ||
a241ec65 PM |
619 | /* |
620 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
621 | * incrementing the corresponding element of the pipeline array. The | |
622 | * counter in the element should never be greater than 1, otherwise, the | |
623 | * RCU implementation is broken. | |
624 | */ | |
625 | static int | |
626 | rcu_torture_reader(void *arg) | |
627 | { | |
628 | int completed; | |
72e9bb54 | 629 | int idx; |
a241ec65 PM |
630 | DEFINE_RCU_RANDOM(rand); |
631 | struct rcu_torture *p; | |
632 | int pipe_count; | |
633 | ||
634 | VERBOSE_PRINTK_STRING("rcu_torture_reader task started"); | |
dbdf65b1 IM |
635 | set_user_nice(current, 19); |
636 | ||
a241ec65 | 637 | do { |
72e9bb54 PM |
638 | idx = cur_ops->readlock(); |
639 | completed = cur_ops->completed(); | |
a241ec65 PM |
640 | p = rcu_dereference(rcu_torture_current); |
641 | if (p == NULL) { | |
642 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 643 | cur_ops->readunlock(idx); |
a241ec65 PM |
644 | schedule_timeout_interruptible(HZ); |
645 | continue; | |
646 | } | |
996417d2 PM |
647 | if (p->rtort_mbtest == 0) |
648 | atomic_inc(&n_rcu_torture_mberror); | |
b2896d2e | 649 | cur_ops->readdelay(&rand); |
a241ec65 PM |
650 | preempt_disable(); |
651 | pipe_count = p->rtort_pipe_count; | |
652 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
653 | /* Should not happen, but... */ | |
654 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
655 | } | |
656 | ++__get_cpu_var(rcu_torture_count)[pipe_count]; | |
72e9bb54 | 657 | completed = cur_ops->completed() - completed; |
a241ec65 PM |
658 | if (completed > RCU_TORTURE_PIPE_LEN) { |
659 | /* Should not happen, but... */ | |
660 | completed = RCU_TORTURE_PIPE_LEN; | |
661 | } | |
662 | ++__get_cpu_var(rcu_torture_batch)[completed]; | |
663 | preempt_enable(); | |
72e9bb54 | 664 | cur_ops->readunlock(idx); |
a241ec65 | 665 | schedule(); |
d120f65f | 666 | rcu_stutter_wait(); |
a241ec65 PM |
667 | } while (!kthread_should_stop() && !fullstop); |
668 | VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping"); | |
669 | while (!kthread_should_stop()) | |
670 | schedule_timeout_uninterruptible(1); | |
671 | return 0; | |
672 | } | |
673 | ||
674 | /* | |
675 | * Create an RCU-torture statistics message in the specified buffer. | |
676 | */ | |
677 | static int | |
678 | rcu_torture_printk(char *page) | |
679 | { | |
680 | int cnt = 0; | |
681 | int cpu; | |
682 | int i; | |
683 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
684 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
685 | ||
0a945022 | 686 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
687 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
688 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
689 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
690 | } | |
691 | } | |
692 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
693 | if (pipesummary[i] != 0) | |
694 | break; | |
695 | } | |
72e9bb54 | 696 | cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 | 697 | cnt += sprintf(&page[cnt], |
996417d2 PM |
698 | "rtc: %p ver: %ld tfle: %d rta: %d rtaf: %d rtf: %d " |
699 | "rtmbe: %d", | |
a241ec65 PM |
700 | rcu_torture_current, |
701 | rcu_torture_current_version, | |
702 | list_empty(&rcu_torture_freelist), | |
703 | atomic_read(&n_rcu_torture_alloc), | |
704 | atomic_read(&n_rcu_torture_alloc_fail), | |
996417d2 PM |
705 | atomic_read(&n_rcu_torture_free), |
706 | atomic_read(&n_rcu_torture_mberror)); | |
707 | if (atomic_read(&n_rcu_torture_mberror) != 0) | |
708 | cnt += sprintf(&page[cnt], " !!!"); | |
72e9bb54 | 709 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
996417d2 | 710 | if (i > 1) { |
a241ec65 | 711 | cnt += sprintf(&page[cnt], "!!! "); |
996417d2 | 712 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 713 | WARN_ON_ONCE(1); |
996417d2 | 714 | } |
a241ec65 PM |
715 | cnt += sprintf(&page[cnt], "Reader Pipe: "); |
716 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) | |
717 | cnt += sprintf(&page[cnt], " %ld", pipesummary[i]); | |
72e9bb54 | 718 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 | 719 | cnt += sprintf(&page[cnt], "Reader Batch: "); |
72e9bb54 | 720 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
a241ec65 | 721 | cnt += sprintf(&page[cnt], " %ld", batchsummary[i]); |
72e9bb54 | 722 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 PM |
723 | cnt += sprintf(&page[cnt], "Free-Block Circulation: "); |
724 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { | |
725 | cnt += sprintf(&page[cnt], " %d", | |
726 | atomic_read(&rcu_torture_wcount[i])); | |
727 | } | |
728 | cnt += sprintf(&page[cnt], "\n"); | |
c8e5b163 | 729 | if (cur_ops->stats) |
72e9bb54 | 730 | cnt += cur_ops->stats(&page[cnt]); |
a241ec65 PM |
731 | return cnt; |
732 | } | |
733 | ||
734 | /* | |
735 | * Print torture statistics. Caller must ensure that there is only | |
736 | * one call to this function at a given time!!! This is normally | |
737 | * accomplished by relying on the module system to only have one copy | |
738 | * of the module loaded, and then by giving the rcu_torture_stats | |
739 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
740 | * thread is not running). | |
741 | */ | |
742 | static void | |
743 | rcu_torture_stats_print(void) | |
744 | { | |
745 | int cnt; | |
746 | ||
747 | cnt = rcu_torture_printk(printk_buf); | |
748 | printk(KERN_ALERT "%s", printk_buf); | |
749 | } | |
750 | ||
751 | /* | |
752 | * Periodically prints torture statistics, if periodic statistics printing | |
753 | * was specified via the stat_interval module parameter. | |
754 | * | |
755 | * No need to worry about fullstop here, since this one doesn't reference | |
756 | * volatile state or register callbacks. | |
757 | */ | |
758 | static int | |
759 | rcu_torture_stats(void *arg) | |
760 | { | |
761 | VERBOSE_PRINTK_STRING("rcu_torture_stats task started"); | |
762 | do { | |
763 | schedule_timeout_interruptible(stat_interval * HZ); | |
764 | rcu_torture_stats_print(); | |
765 | } while (!kthread_should_stop()); | |
766 | VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping"); | |
767 | return 0; | |
768 | } | |
769 | ||
d84f5203 SV |
770 | static int rcu_idle_cpu; /* Force all torture tasks off this CPU */ |
771 | ||
772 | /* Shuffle tasks such that we allow @rcu_idle_cpu to become idle. A special case | |
773 | * is when @rcu_idle_cpu = -1, when we allow the tasks to run on all CPUs. | |
774 | */ | |
b2896d2e | 775 | static void rcu_torture_shuffle_tasks(void) |
d84f5203 | 776 | { |
f70316da | 777 | cpumask_t tmp_mask; |
d84f5203 SV |
778 | int i; |
779 | ||
f70316da | 780 | cpus_setall(tmp_mask); |
86ef5c9a | 781 | get_online_cpus(); |
d84f5203 SV |
782 | |
783 | /* No point in shuffling if there is only one online CPU (ex: UP) */ | |
784 | if (num_online_cpus() == 1) { | |
86ef5c9a | 785 | put_online_cpus(); |
d84f5203 SV |
786 | return; |
787 | } | |
788 | ||
789 | if (rcu_idle_cpu != -1) | |
790 | cpu_clear(rcu_idle_cpu, tmp_mask); | |
791 | ||
f70316da | 792 | set_cpus_allowed_ptr(current, &tmp_mask); |
d84f5203 | 793 | |
c8e5b163 | 794 | if (reader_tasks) { |
d84f5203 SV |
795 | for (i = 0; i < nrealreaders; i++) |
796 | if (reader_tasks[i]) | |
f70316da MT |
797 | set_cpus_allowed_ptr(reader_tasks[i], |
798 | &tmp_mask); | |
d84f5203 SV |
799 | } |
800 | ||
c8e5b163 | 801 | if (fakewriter_tasks) { |
b772e1dd JT |
802 | for (i = 0; i < nfakewriters; i++) |
803 | if (fakewriter_tasks[i]) | |
f70316da MT |
804 | set_cpus_allowed_ptr(fakewriter_tasks[i], |
805 | &tmp_mask); | |
b772e1dd JT |
806 | } |
807 | ||
d84f5203 | 808 | if (writer_task) |
f70316da | 809 | set_cpus_allowed_ptr(writer_task, &tmp_mask); |
d84f5203 SV |
810 | |
811 | if (stats_task) | |
f70316da | 812 | set_cpus_allowed_ptr(stats_task, &tmp_mask); |
d84f5203 SV |
813 | |
814 | if (rcu_idle_cpu == -1) | |
815 | rcu_idle_cpu = num_online_cpus() - 1; | |
816 | else | |
817 | rcu_idle_cpu--; | |
818 | ||
86ef5c9a | 819 | put_online_cpus(); |
d84f5203 SV |
820 | } |
821 | ||
822 | /* Shuffle tasks across CPUs, with the intent of allowing each CPU in the | |
823 | * system to become idle at a time and cut off its timer ticks. This is meant | |
824 | * to test the support for such tickless idle CPU in RCU. | |
825 | */ | |
826 | static int | |
827 | rcu_torture_shuffle(void *arg) | |
828 | { | |
829 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task started"); | |
830 | do { | |
831 | schedule_timeout_interruptible(shuffle_interval * HZ); | |
832 | rcu_torture_shuffle_tasks(); | |
833 | } while (!kthread_should_stop()); | |
834 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping"); | |
835 | return 0; | |
836 | } | |
837 | ||
d120f65f PM |
838 | /* Cause the rcutorture test to "stutter", starting and stopping all |
839 | * threads periodically. | |
840 | */ | |
841 | static int | |
842 | rcu_torture_stutter(void *arg) | |
843 | { | |
844 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task started"); | |
845 | do { | |
846 | schedule_timeout_interruptible(stutter * HZ); | |
847 | stutter_pause_test = 1; | |
848 | if (!kthread_should_stop()) | |
849 | schedule_timeout_interruptible(stutter * HZ); | |
850 | stutter_pause_test = 0; | |
851 | } while (!kthread_should_stop()); | |
852 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping"); | |
853 | return 0; | |
854 | } | |
855 | ||
95c38322 PM |
856 | static inline void |
857 | rcu_torture_print_module_parms(char *tag) | |
858 | { | |
b772e1dd JT |
859 | printk(KERN_ALERT "%s" TORTURE_FLAG |
860 | "--- %s: nreaders=%d nfakewriters=%d " | |
95c38322 | 861 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " |
d120f65f | 862 | "shuffle_interval=%d stutter=%d\n", |
b772e1dd | 863 | torture_type, tag, nrealreaders, nfakewriters, |
d120f65f PM |
864 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, |
865 | stutter); | |
95c38322 PM |
866 | } |
867 | ||
a241ec65 PM |
868 | static void |
869 | rcu_torture_cleanup(void) | |
870 | { | |
871 | int i; | |
872 | ||
873 | fullstop = 1; | |
d120f65f PM |
874 | if (stutter_task) { |
875 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task"); | |
876 | kthread_stop(stutter_task); | |
877 | } | |
878 | stutter_task = NULL; | |
c8e5b163 | 879 | if (shuffler_task) { |
d84f5203 SV |
880 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task"); |
881 | kthread_stop(shuffler_task); | |
882 | } | |
883 | shuffler_task = NULL; | |
884 | ||
c8e5b163 | 885 | if (writer_task) { |
a241ec65 PM |
886 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_writer task"); |
887 | kthread_stop(writer_task); | |
888 | } | |
889 | writer_task = NULL; | |
890 | ||
c8e5b163 | 891 | if (reader_tasks) { |
a241ec65 | 892 | for (i = 0; i < nrealreaders; i++) { |
c8e5b163 | 893 | if (reader_tasks[i]) { |
a241ec65 PM |
894 | VERBOSE_PRINTK_STRING( |
895 | "Stopping rcu_torture_reader task"); | |
896 | kthread_stop(reader_tasks[i]); | |
897 | } | |
898 | reader_tasks[i] = NULL; | |
899 | } | |
900 | kfree(reader_tasks); | |
901 | reader_tasks = NULL; | |
902 | } | |
903 | rcu_torture_current = NULL; | |
904 | ||
c8e5b163 | 905 | if (fakewriter_tasks) { |
b772e1dd | 906 | for (i = 0; i < nfakewriters; i++) { |
c8e5b163 | 907 | if (fakewriter_tasks[i]) { |
b772e1dd JT |
908 | VERBOSE_PRINTK_STRING( |
909 | "Stopping rcu_torture_fakewriter task"); | |
910 | kthread_stop(fakewriter_tasks[i]); | |
911 | } | |
912 | fakewriter_tasks[i] = NULL; | |
913 | } | |
914 | kfree(fakewriter_tasks); | |
915 | fakewriter_tasks = NULL; | |
916 | } | |
917 | ||
c8e5b163 | 918 | if (stats_task) { |
a241ec65 PM |
919 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); |
920 | kthread_stop(stats_task); | |
921 | } | |
922 | stats_task = NULL; | |
923 | ||
924 | /* Wait for all RCU callbacks to fire. */ | |
2326974d PM |
925 | |
926 | if (cur_ops->cb_barrier != NULL) | |
927 | cur_ops->cb_barrier(); | |
a241ec65 | 928 | |
a241ec65 | 929 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 930 | |
c8e5b163 | 931 | if (cur_ops->cleanup) |
72e9bb54 | 932 | cur_ops->cleanup(); |
95c38322 PM |
933 | if (atomic_read(&n_rcu_torture_error)) |
934 | rcu_torture_print_module_parms("End of test: FAILURE"); | |
935 | else | |
936 | rcu_torture_print_module_parms("End of test: SUCCESS"); | |
a241ec65 PM |
937 | } |
938 | ||
6f8bc500 | 939 | static int __init |
a241ec65 PM |
940 | rcu_torture_init(void) |
941 | { | |
942 | int i; | |
943 | int cpu; | |
944 | int firsterr = 0; | |
ade5fb81 JT |
945 | static struct rcu_torture_ops *torture_ops[] = |
946 | { &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &rcu_bh_sync_ops, | |
2326974d | 947 | &srcu_ops, &sched_ops, &sched_ops_sync, }; |
a241ec65 PM |
948 | |
949 | /* Process args and tell the world that the torturer is on the job. */ | |
ade5fb81 | 950 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 951 | cur_ops = torture_ops[i]; |
ade5fb81 | 952 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 953 | break; |
72e9bb54 | 954 | } |
ade5fb81 | 955 | if (i == ARRAY_SIZE(torture_ops)) { |
72e9bb54 PM |
956 | printk(KERN_ALERT "rcutorture: invalid torture type: \"%s\"\n", |
957 | torture_type); | |
958 | return (-EINVAL); | |
959 | } | |
c8e5b163 | 960 | if (cur_ops->init) |
72e9bb54 PM |
961 | cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
962 | ||
a241ec65 PM |
963 | if (nreaders >= 0) |
964 | nrealreaders = nreaders; | |
965 | else | |
966 | nrealreaders = 2 * num_online_cpus(); | |
95c38322 | 967 | rcu_torture_print_module_parms("Start of test"); |
a241ec65 PM |
968 | fullstop = 0; |
969 | ||
970 | /* Set up the freelist. */ | |
971 | ||
972 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 973 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 974 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
975 | list_add_tail(&rcu_tortures[i].rtort_free, |
976 | &rcu_torture_freelist); | |
977 | } | |
978 | ||
979 | /* Initialize the statistics so that each run gets its own numbers. */ | |
980 | ||
981 | rcu_torture_current = NULL; | |
982 | rcu_torture_current_version = 0; | |
983 | atomic_set(&n_rcu_torture_alloc, 0); | |
984 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
985 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
986 | atomic_set(&n_rcu_torture_mberror, 0); |
987 | atomic_set(&n_rcu_torture_error, 0); | |
a241ec65 PM |
988 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
989 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 990 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
991 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
992 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
993 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
994 | } | |
995 | } | |
996 | ||
997 | /* Start up the kthreads. */ | |
998 | ||
999 | VERBOSE_PRINTK_STRING("Creating rcu_torture_writer task"); | |
1000 | writer_task = kthread_run(rcu_torture_writer, NULL, | |
1001 | "rcu_torture_writer"); | |
1002 | if (IS_ERR(writer_task)) { | |
1003 | firsterr = PTR_ERR(writer_task); | |
1004 | VERBOSE_PRINTK_ERRSTRING("Failed to create writer"); | |
1005 | writer_task = NULL; | |
1006 | goto unwind; | |
1007 | } | |
b772e1dd JT |
1008 | fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
1009 | GFP_KERNEL); | |
1010 | if (fakewriter_tasks == NULL) { | |
1011 | VERBOSE_PRINTK_ERRSTRING("out of memory"); | |
1012 | firsterr = -ENOMEM; | |
1013 | goto unwind; | |
1014 | } | |
1015 | for (i = 0; i < nfakewriters; i++) { | |
1016 | VERBOSE_PRINTK_STRING("Creating rcu_torture_fakewriter task"); | |
1017 | fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, | |
1018 | "rcu_torture_fakewriter"); | |
1019 | if (IS_ERR(fakewriter_tasks[i])) { | |
1020 | firsterr = PTR_ERR(fakewriter_tasks[i]); | |
1021 | VERBOSE_PRINTK_ERRSTRING("Failed to create fakewriter"); | |
1022 | fakewriter_tasks[i] = NULL; | |
1023 | goto unwind; | |
1024 | } | |
1025 | } | |
2860aaba | 1026 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1027 | GFP_KERNEL); |
1028 | if (reader_tasks == NULL) { | |
1029 | VERBOSE_PRINTK_ERRSTRING("out of memory"); | |
1030 | firsterr = -ENOMEM; | |
1031 | goto unwind; | |
1032 | } | |
1033 | for (i = 0; i < nrealreaders; i++) { | |
1034 | VERBOSE_PRINTK_STRING("Creating rcu_torture_reader task"); | |
1035 | reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, | |
1036 | "rcu_torture_reader"); | |
1037 | if (IS_ERR(reader_tasks[i])) { | |
1038 | firsterr = PTR_ERR(reader_tasks[i]); | |
1039 | VERBOSE_PRINTK_ERRSTRING("Failed to create reader"); | |
1040 | reader_tasks[i] = NULL; | |
1041 | goto unwind; | |
1042 | } | |
1043 | } | |
1044 | if (stat_interval > 0) { | |
1045 | VERBOSE_PRINTK_STRING("Creating rcu_torture_stats task"); | |
1046 | stats_task = kthread_run(rcu_torture_stats, NULL, | |
1047 | "rcu_torture_stats"); | |
1048 | if (IS_ERR(stats_task)) { | |
1049 | firsterr = PTR_ERR(stats_task); | |
1050 | VERBOSE_PRINTK_ERRSTRING("Failed to create stats"); | |
1051 | stats_task = NULL; | |
1052 | goto unwind; | |
1053 | } | |
1054 | } | |
d84f5203 SV |
1055 | if (test_no_idle_hz) { |
1056 | rcu_idle_cpu = num_online_cpus() - 1; | |
1057 | /* Create the shuffler thread */ | |
1058 | shuffler_task = kthread_run(rcu_torture_shuffle, NULL, | |
1059 | "rcu_torture_shuffle"); | |
1060 | if (IS_ERR(shuffler_task)) { | |
1061 | firsterr = PTR_ERR(shuffler_task); | |
1062 | VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler"); | |
1063 | shuffler_task = NULL; | |
1064 | goto unwind; | |
1065 | } | |
1066 | } | |
d120f65f PM |
1067 | if (stutter < 0) |
1068 | stutter = 0; | |
1069 | if (stutter) { | |
1070 | /* Create the stutter thread */ | |
1071 | stutter_task = kthread_run(rcu_torture_stutter, NULL, | |
1072 | "rcu_torture_stutter"); | |
1073 | if (IS_ERR(stutter_task)) { | |
1074 | firsterr = PTR_ERR(stutter_task); | |
1075 | VERBOSE_PRINTK_ERRSTRING("Failed to create stutter"); | |
1076 | stutter_task = NULL; | |
1077 | goto unwind; | |
1078 | } | |
1079 | } | |
a241ec65 PM |
1080 | return 0; |
1081 | ||
1082 | unwind: | |
1083 | rcu_torture_cleanup(); | |
1084 | return firsterr; | |
1085 | } | |
1086 | ||
1087 | module_init(rcu_torture_init); | |
1088 | module_exit(rcu_torture_cleanup); |