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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> | |
a71fca58 | 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> | |
60063497 | 36 | #include <linux/atomic.h> |
a241ec65 | 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> | |
343e9099 | 42 | #include <linux/reboot.h> |
83144186 | 43 | #include <linux/freezer.h> |
a241ec65 | 44 | #include <linux/cpu.h> |
a241ec65 | 45 | #include <linux/delay.h> |
a241ec65 | 46 | #include <linux/stat.h> |
b2896d2e | 47 | #include <linux/srcu.h> |
1aeb272c | 48 | #include <linux/slab.h> |
f07767fd | 49 | #include <asm/byteorder.h> |
a241ec65 PM |
50 | |
51 | MODULE_LICENSE("GPL"); | |
b772e1dd | 52 | MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and " |
a71fca58 | 53 | "Josh Triplett <josh@freedesktop.org>"); |
a241ec65 | 54 | |
4802211c | 55 | static int nreaders = -1; /* # reader threads, defaults to 2*ncpus */ |
b772e1dd | 56 | static int nfakewriters = 4; /* # fake writer threads */ |
d84f5203 | 57 | static int stat_interval; /* Interval between stats, in seconds. */ |
a241ec65 | 58 | /* Defaults to "only at end of test". */ |
d8e8ed95 RR |
59 | static bool verbose; /* Print more debug info. */ |
60 | static bool test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */ | |
d120f65f PM |
61 | static int shuffle_interval = 3; /* Interval between shuffles (in sec)*/ |
62 | static int stutter = 5; /* Start/stop testing interval (in sec) */ | |
0729fbf3 | 63 | static int irqreader = 1; /* RCU readers from irq (timers). */ |
d5f546d8 PM |
64 | static int fqs_duration; /* Duration of bursts (us), 0 to disable. */ |
65 | static int fqs_holdoff; /* Hold time within burst (us). */ | |
bf66f18e | 66 | static int fqs_stutter = 3; /* Wait time between bursts (s). */ |
b58bdcca | 67 | static int onoff_interval; /* Wait time between CPU hotplugs, 0=disable. */ |
9b9ec9b9 | 68 | static int onoff_holdoff; /* Seconds after boot before CPU hotplugs. */ |
d5f546d8 | 69 | static int shutdown_secs; /* Shutdown time (s). <=0 for no shutdown. */ |
c13f3757 PM |
70 | static int stall_cpu; /* CPU-stall duration (s). 0 for no stall. */ |
71 | static int stall_cpu_holdoff = 10; /* Time to wait until stall (s). */ | |
8e8be45e PM |
72 | static int test_boost = 1; /* Test RCU prio boost: 0=no, 1=maybe, 2=yes. */ |
73 | static int test_boost_interval = 7; /* Interval between boost tests, seconds. */ | |
74 | static int test_boost_duration = 4; /* Duration of each boost test, seconds. */ | |
20d2e428 | 75 | static char *torture_type = "rcu"; /* What RCU implementation to torture. */ |
a241ec65 | 76 | |
d6ad6711 | 77 | module_param(nreaders, int, 0444); |
a241ec65 | 78 | MODULE_PARM_DESC(nreaders, "Number of RCU reader threads"); |
d6ad6711 | 79 | module_param(nfakewriters, int, 0444); |
b772e1dd | 80 | MODULE_PARM_DESC(nfakewriters, "Number of RCU fake writer threads"); |
3721bc1d | 81 | module_param(stat_interval, int, 0644); |
a241ec65 | 82 | MODULE_PARM_DESC(stat_interval, "Number of seconds between stats printk()s"); |
d6ad6711 | 83 | module_param(verbose, bool, 0444); |
a241ec65 | 84 | MODULE_PARM_DESC(verbose, "Enable verbose debugging printk()s"); |
d6ad6711 | 85 | module_param(test_no_idle_hz, bool, 0444); |
d84f5203 | 86 | MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs"); |
d6ad6711 | 87 | module_param(shuffle_interval, int, 0444); |
d84f5203 | 88 | MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles"); |
d120f65f PM |
89 | module_param(stutter, int, 0444); |
90 | MODULE_PARM_DESC(stutter, "Number of seconds to run/halt test"); | |
0729fbf3 PM |
91 | module_param(irqreader, int, 0444); |
92 | MODULE_PARM_DESC(irqreader, "Allow RCU readers from irq handlers"); | |
bf66f18e PM |
93 | module_param(fqs_duration, int, 0444); |
94 | MODULE_PARM_DESC(fqs_duration, "Duration of fqs bursts (us)"); | |
95 | module_param(fqs_holdoff, int, 0444); | |
96 | MODULE_PARM_DESC(fqs_holdoff, "Holdoff time within fqs bursts (us)"); | |
97 | module_param(fqs_stutter, int, 0444); | |
98 | MODULE_PARM_DESC(fqs_stutter, "Wait time between fqs bursts (s)"); | |
b58bdcca PM |
99 | module_param(onoff_interval, int, 0444); |
100 | MODULE_PARM_DESC(onoff_interval, "Time between CPU hotplugs (s), 0=disable"); | |
9b9ec9b9 PM |
101 | module_param(onoff_holdoff, int, 0444); |
102 | MODULE_PARM_DESC(onoff_holdoff, "Time after boot before CPU hotplugs (s)"); | |
d5f546d8 PM |
103 | module_param(shutdown_secs, int, 0444); |
104 | MODULE_PARM_DESC(shutdown_secs, "Shutdown time (s), zero to disable."); | |
c13f3757 PM |
105 | module_param(stall_cpu, int, 0444); |
106 | MODULE_PARM_DESC(stall_cpu, "Stall duration (s), zero to disable."); | |
107 | module_param(stall_cpu_holdoff, int, 0444); | |
108 | MODULE_PARM_DESC(stall_cpu_holdoff, "Time to wait before starting stall (s)."); | |
8e8be45e PM |
109 | module_param(test_boost, int, 0444); |
110 | MODULE_PARM_DESC(test_boost, "Test RCU prio boost: 0=no, 1=maybe, 2=yes."); | |
111 | module_param(test_boost_interval, int, 0444); | |
112 | MODULE_PARM_DESC(test_boost_interval, "Interval between boost tests, seconds."); | |
113 | module_param(test_boost_duration, int, 0444); | |
114 | MODULE_PARM_DESC(test_boost_duration, "Duration of each boost test, seconds."); | |
d6ad6711 | 115 | module_param(torture_type, charp, 0444); |
b2896d2e | 116 | MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh, srcu)"); |
72e9bb54 PM |
117 | |
118 | #define TORTURE_FLAG "-torture:" | |
a241ec65 | 119 | #define PRINTK_STRING(s) \ |
72e9bb54 | 120 | do { printk(KERN_ALERT "%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
a241ec65 | 121 | #define VERBOSE_PRINTK_STRING(s) \ |
72e9bb54 | 122 | do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG s "\n", torture_type); } while (0) |
a241ec65 | 123 | #define VERBOSE_PRINTK_ERRSTRING(s) \ |
72e9bb54 | 124 | do { if (verbose) printk(KERN_ALERT "%s" TORTURE_FLAG "!!! " s "\n", torture_type); } while (0) |
a241ec65 PM |
125 | |
126 | static char printk_buf[4096]; | |
127 | ||
128 | static int nrealreaders; | |
129 | static struct task_struct *writer_task; | |
b772e1dd | 130 | static struct task_struct **fakewriter_tasks; |
a241ec65 PM |
131 | static struct task_struct **reader_tasks; |
132 | static struct task_struct *stats_task; | |
d84f5203 | 133 | static struct task_struct *shuffler_task; |
d120f65f | 134 | static struct task_struct *stutter_task; |
bf66f18e | 135 | static struct task_struct *fqs_task; |
8e8be45e | 136 | static struct task_struct *boost_tasks[NR_CPUS]; |
d5f546d8 | 137 | static struct task_struct *shutdown_task; |
b58bdcca PM |
138 | #ifdef CONFIG_HOTPLUG_CPU |
139 | static struct task_struct *onoff_task; | |
140 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ | |
c13f3757 | 141 | static struct task_struct *stall_task; |
a241ec65 PM |
142 | |
143 | #define RCU_TORTURE_PIPE_LEN 10 | |
144 | ||
145 | struct rcu_torture { | |
146 | struct rcu_head rtort_rcu; | |
147 | int rtort_pipe_count; | |
148 | struct list_head rtort_free; | |
996417d2 | 149 | int rtort_mbtest; |
a241ec65 PM |
150 | }; |
151 | ||
a241ec65 | 152 | static LIST_HEAD(rcu_torture_freelist); |
0ddea0ea | 153 | static struct rcu_torture __rcu *rcu_torture_current; |
4a298656 | 154 | static unsigned long rcu_torture_current_version; |
a241ec65 PM |
155 | static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN]; |
156 | static DEFINE_SPINLOCK(rcu_torture_lock); | |
157 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count) = | |
158 | { 0 }; | |
159 | static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch) = | |
160 | { 0 }; | |
161 | static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1]; | |
b2896d2e PM |
162 | static atomic_t n_rcu_torture_alloc; |
163 | static atomic_t n_rcu_torture_alloc_fail; | |
164 | static atomic_t n_rcu_torture_free; | |
165 | static atomic_t n_rcu_torture_mberror; | |
166 | static atomic_t n_rcu_torture_error; | |
8e8be45e PM |
167 | static long n_rcu_torture_boost_ktrerror; |
168 | static long n_rcu_torture_boost_rterror; | |
8e8be45e PM |
169 | static long n_rcu_torture_boost_failure; |
170 | static long n_rcu_torture_boosts; | |
a71fca58 | 171 | static long n_rcu_torture_timers; |
b58bdcca PM |
172 | static long n_offline_attempts; |
173 | static long n_offline_successes; | |
174 | static long n_online_attempts; | |
175 | static long n_online_successes; | |
e3033736 | 176 | static struct list_head rcu_torture_removed; |
73d0a4b1 | 177 | static cpumask_var_t shuffle_tmp_mask; |
a241ec65 | 178 | |
a71fca58 | 179 | static int stutter_pause_test; |
d120f65f | 180 | |
31a72bce PM |
181 | #if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE) |
182 | #define RCUTORTURE_RUNNABLE_INIT 1 | |
183 | #else | |
184 | #define RCUTORTURE_RUNNABLE_INIT 0 | |
185 | #endif | |
186 | int rcutorture_runnable = RCUTORTURE_RUNNABLE_INIT; | |
bb3bf705 PM |
187 | module_param(rcutorture_runnable, int, 0444); |
188 | MODULE_PARM_DESC(rcutorture_runnable, "Start rcutorture at boot"); | |
31a72bce | 189 | |
3acf4a9a | 190 | #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) |
8e8be45e | 191 | #define rcu_can_boost() 1 |
3acf4a9a | 192 | #else /* #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 193 | #define rcu_can_boost() 0 |
3acf4a9a | 194 | #endif /* #else #if defined(CONFIG_RCU_BOOST) && !defined(CONFIG_HOTPLUG_CPU) */ |
8e8be45e | 195 | |
d5f546d8 | 196 | static unsigned long shutdown_time; /* jiffies to system shutdown. */ |
8e8be45e PM |
197 | static unsigned long boost_starttime; /* jiffies of next boost test start. */ |
198 | DEFINE_MUTEX(boost_mutex); /* protect setting boost_starttime */ | |
199 | /* and boost task create/destroy. */ | |
200 | ||
c9d557c1 PM |
201 | /* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */ |
202 | ||
203 | #define FULLSTOP_DONTSTOP 0 /* Normal operation. */ | |
204 | #define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */ | |
205 | #define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */ | |
206 | static int fullstop = FULLSTOP_RMMOD; | |
0ddea0ea PM |
207 | /* |
208 | * Protect fullstop transitions and spawning of kthreads. | |
209 | */ | |
210 | static DEFINE_MUTEX(fullstop_mutex); | |
343e9099 | 211 | |
d5f546d8 PM |
212 | /* Forward reference. */ |
213 | static void rcu_torture_cleanup(void); | |
214 | ||
343e9099 | 215 | /* |
c9d557c1 | 216 | * Detect and respond to a system shutdown. |
343e9099 PM |
217 | */ |
218 | static int | |
219 | rcutorture_shutdown_notify(struct notifier_block *unused1, | |
220 | unsigned long unused2, void *unused3) | |
221 | { | |
c59ab97e | 222 | mutex_lock(&fullstop_mutex); |
c9d557c1 | 223 | if (fullstop == FULLSTOP_DONTSTOP) |
c59ab97e | 224 | fullstop = FULLSTOP_SHUTDOWN; |
c9d557c1 PM |
225 | else |
226 | printk(KERN_WARNING /* but going down anyway, so... */ | |
227 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); | |
c59ab97e | 228 | mutex_unlock(&fullstop_mutex); |
343e9099 PM |
229 | return NOTIFY_DONE; |
230 | } | |
231 | ||
c9d557c1 PM |
232 | /* |
233 | * Absorb kthreads into a kernel function that won't return, so that | |
234 | * they won't ever access module text or data again. | |
235 | */ | |
236 | static void rcutorture_shutdown_absorb(char *title) | |
237 | { | |
238 | if (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { | |
239 | printk(KERN_NOTICE | |
240 | "rcutorture thread %s parking due to system shutdown\n", | |
241 | title); | |
242 | schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT); | |
243 | } | |
244 | } | |
245 | ||
a241ec65 PM |
246 | /* |
247 | * Allocate an element from the rcu_tortures pool. | |
248 | */ | |
97a41e26 | 249 | static struct rcu_torture * |
a241ec65 PM |
250 | rcu_torture_alloc(void) |
251 | { | |
252 | struct list_head *p; | |
253 | ||
adac1665 | 254 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 PM |
255 | if (list_empty(&rcu_torture_freelist)) { |
256 | atomic_inc(&n_rcu_torture_alloc_fail); | |
adac1665 | 257 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
258 | return NULL; |
259 | } | |
260 | atomic_inc(&n_rcu_torture_alloc); | |
261 | p = rcu_torture_freelist.next; | |
262 | list_del_init(p); | |
adac1665 | 263 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
264 | return container_of(p, struct rcu_torture, rtort_free); |
265 | } | |
266 | ||
267 | /* | |
268 | * Free an element to the rcu_tortures pool. | |
269 | */ | |
270 | static void | |
271 | rcu_torture_free(struct rcu_torture *p) | |
272 | { | |
273 | atomic_inc(&n_rcu_torture_free); | |
adac1665 | 274 | spin_lock_bh(&rcu_torture_lock); |
a241ec65 | 275 | list_add_tail(&p->rtort_free, &rcu_torture_freelist); |
adac1665 | 276 | spin_unlock_bh(&rcu_torture_lock); |
a241ec65 PM |
277 | } |
278 | ||
a241ec65 PM |
279 | struct rcu_random_state { |
280 | unsigned long rrs_state; | |
75cfef32 | 281 | long rrs_count; |
a241ec65 PM |
282 | }; |
283 | ||
284 | #define RCU_RANDOM_MULT 39916801 /* prime */ | |
285 | #define RCU_RANDOM_ADD 479001701 /* prime */ | |
286 | #define RCU_RANDOM_REFRESH 10000 | |
287 | ||
288 | #define DEFINE_RCU_RANDOM(name) struct rcu_random_state name = { 0, 0 } | |
289 | ||
290 | /* | |
291 | * Crude but fast random-number generator. Uses a linear congruential | |
c17ac855 | 292 | * generator, with occasional help from cpu_clock(). |
a241ec65 | 293 | */ |
75cfef32 | 294 | static unsigned long |
a241ec65 PM |
295 | rcu_random(struct rcu_random_state *rrsp) |
296 | { | |
a241ec65 | 297 | if (--rrsp->rrs_count < 0) { |
c676329a | 298 | rrsp->rrs_state += (unsigned long)local_clock(); |
a241ec65 PM |
299 | rrsp->rrs_count = RCU_RANDOM_REFRESH; |
300 | } | |
301 | rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD; | |
302 | return swahw32(rrsp->rrs_state); | |
303 | } | |
304 | ||
d120f65f | 305 | static void |
c9d557c1 | 306 | rcu_stutter_wait(char *title) |
d120f65f | 307 | { |
c9d557c1 | 308 | while (stutter_pause_test || !rcutorture_runnable) { |
e3d7be27 PM |
309 | if (rcutorture_runnable) |
310 | schedule_timeout_interruptible(1); | |
311 | else | |
3ccf79f4 | 312 | schedule_timeout_interruptible(round_jiffies_relative(HZ)); |
c9d557c1 | 313 | rcutorture_shutdown_absorb(title); |
343e9099 | 314 | } |
d120f65f PM |
315 | } |
316 | ||
72e9bb54 PM |
317 | /* |
318 | * Operations vector for selecting different types of tests. | |
319 | */ | |
320 | ||
321 | struct rcu_torture_ops { | |
322 | void (*init)(void); | |
323 | void (*cleanup)(void); | |
324 | int (*readlock)(void); | |
0acc512c | 325 | void (*read_delay)(struct rcu_random_state *rrsp); |
72e9bb54 PM |
326 | void (*readunlock)(int idx); |
327 | int (*completed)(void); | |
0acc512c | 328 | void (*deferred_free)(struct rcu_torture *p); |
b772e1dd | 329 | void (*sync)(void); |
2326974d | 330 | void (*cb_barrier)(void); |
bf66f18e | 331 | void (*fqs)(void); |
72e9bb54 | 332 | int (*stats)(char *page); |
0acc512c | 333 | int irq_capable; |
8e8be45e | 334 | int can_boost; |
72e9bb54 PM |
335 | char *name; |
336 | }; | |
a71fca58 PM |
337 | |
338 | static struct rcu_torture_ops *cur_ops; | |
72e9bb54 PM |
339 | |
340 | /* | |
341 | * Definitions for rcu torture testing. | |
342 | */ | |
343 | ||
a49a4af7 | 344 | static int rcu_torture_read_lock(void) __acquires(RCU) |
72e9bb54 PM |
345 | { |
346 | rcu_read_lock(); | |
347 | return 0; | |
348 | } | |
349 | ||
b2896d2e PM |
350 | static void rcu_read_delay(struct rcu_random_state *rrsp) |
351 | { | |
b8d57a76 JT |
352 | const unsigned long shortdelay_us = 200; |
353 | const unsigned long longdelay_ms = 50; | |
b2896d2e | 354 | |
b8d57a76 JT |
355 | /* We want a short delay sometimes to make a reader delay the grace |
356 | * period, and we want a long delay occasionally to trigger | |
357 | * force_quiescent_state. */ | |
b2896d2e | 358 | |
b8d57a76 JT |
359 | if (!(rcu_random(rrsp) % (nrealreaders * 2000 * longdelay_ms))) |
360 | mdelay(longdelay_ms); | |
361 | if (!(rcu_random(rrsp) % (nrealreaders * 2 * shortdelay_us))) | |
362 | udelay(shortdelay_us); | |
e546f485 LJ |
363 | #ifdef CONFIG_PREEMPT |
364 | if (!preempt_count() && !(rcu_random(rrsp) % (nrealreaders * 20000))) | |
365 | preempt_schedule(); /* No QS if preempt_disable() in effect */ | |
366 | #endif | |
b2896d2e PM |
367 | } |
368 | ||
a49a4af7 | 369 | static void rcu_torture_read_unlock(int idx) __releases(RCU) |
72e9bb54 PM |
370 | { |
371 | rcu_read_unlock(); | |
372 | } | |
373 | ||
374 | static int rcu_torture_completed(void) | |
375 | { | |
376 | return rcu_batches_completed(); | |
377 | } | |
378 | ||
379 | static void | |
380 | rcu_torture_cb(struct rcu_head *p) | |
381 | { | |
382 | int i; | |
383 | struct rcu_torture *rp = container_of(p, struct rcu_torture, rtort_rcu); | |
384 | ||
c9d557c1 | 385 | if (fullstop != FULLSTOP_DONTSTOP) { |
72e9bb54 PM |
386 | /* Test is ending, just drop callbacks on the floor. */ |
387 | /* The next initialization will pick up the pieces. */ | |
388 | return; | |
389 | } | |
390 | i = rp->rtort_pipe_count; | |
391 | if (i > RCU_TORTURE_PIPE_LEN) | |
392 | i = RCU_TORTURE_PIPE_LEN; | |
393 | atomic_inc(&rcu_torture_wcount[i]); | |
394 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
395 | rp->rtort_mbtest = 0; | |
396 | rcu_torture_free(rp); | |
397 | } else | |
0acc512c | 398 | cur_ops->deferred_free(rp); |
72e9bb54 PM |
399 | } |
400 | ||
d9a3da06 PM |
401 | static int rcu_no_completed(void) |
402 | { | |
403 | return 0; | |
404 | } | |
405 | ||
72e9bb54 PM |
406 | static void rcu_torture_deferred_free(struct rcu_torture *p) |
407 | { | |
408 | call_rcu(&p->rtort_rcu, rcu_torture_cb); | |
409 | } | |
410 | ||
411 | static struct rcu_torture_ops rcu_ops = { | |
0acc512c PM |
412 | .init = NULL, |
413 | .cleanup = NULL, | |
414 | .readlock = rcu_torture_read_lock, | |
415 | .read_delay = rcu_read_delay, | |
416 | .readunlock = rcu_torture_read_unlock, | |
417 | .completed = rcu_torture_completed, | |
418 | .deferred_free = rcu_torture_deferred_free, | |
419 | .sync = synchronize_rcu, | |
420 | .cb_barrier = rcu_barrier, | |
bf66f18e | 421 | .fqs = rcu_force_quiescent_state, |
0acc512c | 422 | .stats = NULL, |
a71fca58 | 423 | .irq_capable = 1, |
8e8be45e | 424 | .can_boost = rcu_can_boost(), |
a71fca58 | 425 | .name = "rcu" |
72e9bb54 PM |
426 | }; |
427 | ||
e3033736 JT |
428 | static void rcu_sync_torture_deferred_free(struct rcu_torture *p) |
429 | { | |
430 | int i; | |
431 | struct rcu_torture *rp; | |
432 | struct rcu_torture *rp1; | |
433 | ||
434 | cur_ops->sync(); | |
435 | list_add(&p->rtort_free, &rcu_torture_removed); | |
436 | list_for_each_entry_safe(rp, rp1, &rcu_torture_removed, rtort_free) { | |
437 | i = rp->rtort_pipe_count; | |
438 | if (i > RCU_TORTURE_PIPE_LEN) | |
439 | i = RCU_TORTURE_PIPE_LEN; | |
440 | atomic_inc(&rcu_torture_wcount[i]); | |
441 | if (++rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { | |
442 | rp->rtort_mbtest = 0; | |
443 | list_del(&rp->rtort_free); | |
444 | rcu_torture_free(rp); | |
445 | } | |
446 | } | |
447 | } | |
448 | ||
449 | static void rcu_sync_torture_init(void) | |
450 | { | |
451 | INIT_LIST_HEAD(&rcu_torture_removed); | |
452 | } | |
453 | ||
20d2e428 | 454 | static struct rcu_torture_ops rcu_sync_ops = { |
0acc512c PM |
455 | .init = rcu_sync_torture_init, |
456 | .cleanup = NULL, | |
457 | .readlock = rcu_torture_read_lock, | |
458 | .read_delay = rcu_read_delay, | |
459 | .readunlock = rcu_torture_read_unlock, | |
460 | .completed = rcu_torture_completed, | |
461 | .deferred_free = rcu_sync_torture_deferred_free, | |
462 | .sync = synchronize_rcu, | |
463 | .cb_barrier = NULL, | |
bf66f18e | 464 | .fqs = rcu_force_quiescent_state, |
0acc512c PM |
465 | .stats = NULL, |
466 | .irq_capable = 1, | |
8e8be45e | 467 | .can_boost = rcu_can_boost(), |
0acc512c | 468 | .name = "rcu_sync" |
20d2e428 JT |
469 | }; |
470 | ||
d9a3da06 PM |
471 | static struct rcu_torture_ops rcu_expedited_ops = { |
472 | .init = rcu_sync_torture_init, | |
473 | .cleanup = NULL, | |
474 | .readlock = rcu_torture_read_lock, | |
475 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
476 | .readunlock = rcu_torture_read_unlock, | |
477 | .completed = rcu_no_completed, | |
478 | .deferred_free = rcu_sync_torture_deferred_free, | |
479 | .sync = synchronize_rcu_expedited, | |
480 | .cb_barrier = NULL, | |
bf66f18e | 481 | .fqs = rcu_force_quiescent_state, |
d9a3da06 PM |
482 | .stats = NULL, |
483 | .irq_capable = 1, | |
8e8be45e | 484 | .can_boost = rcu_can_boost(), |
d9a3da06 PM |
485 | .name = "rcu_expedited" |
486 | }; | |
487 | ||
c32e0660 PM |
488 | /* |
489 | * Definitions for rcu_bh torture testing. | |
490 | */ | |
491 | ||
a49a4af7 | 492 | static int rcu_bh_torture_read_lock(void) __acquires(RCU_BH) |
c32e0660 PM |
493 | { |
494 | rcu_read_lock_bh(); | |
495 | return 0; | |
496 | } | |
497 | ||
a49a4af7 | 498 | static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) |
c32e0660 PM |
499 | { |
500 | rcu_read_unlock_bh(); | |
501 | } | |
502 | ||
503 | static int rcu_bh_torture_completed(void) | |
504 | { | |
505 | return rcu_batches_completed_bh(); | |
506 | } | |
507 | ||
508 | static void rcu_bh_torture_deferred_free(struct rcu_torture *p) | |
509 | { | |
510 | call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); | |
511 | } | |
512 | ||
513 | static struct rcu_torture_ops rcu_bh_ops = { | |
0acc512c PM |
514 | .init = NULL, |
515 | .cleanup = NULL, | |
516 | .readlock = rcu_bh_torture_read_lock, | |
517 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
518 | .readunlock = rcu_bh_torture_read_unlock, | |
519 | .completed = rcu_bh_torture_completed, | |
520 | .deferred_free = rcu_bh_torture_deferred_free, | |
bdf2a436 | 521 | .sync = synchronize_rcu_bh, |
0acc512c | 522 | .cb_barrier = rcu_barrier_bh, |
bf66f18e | 523 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
524 | .stats = NULL, |
525 | .irq_capable = 1, | |
526 | .name = "rcu_bh" | |
c32e0660 PM |
527 | }; |
528 | ||
11a14701 | 529 | static struct rcu_torture_ops rcu_bh_sync_ops = { |
0acc512c PM |
530 | .init = rcu_sync_torture_init, |
531 | .cleanup = NULL, | |
532 | .readlock = rcu_bh_torture_read_lock, | |
533 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
534 | .readunlock = rcu_bh_torture_read_unlock, | |
535 | .completed = rcu_bh_torture_completed, | |
536 | .deferred_free = rcu_sync_torture_deferred_free, | |
bdf2a436 | 537 | .sync = synchronize_rcu_bh, |
0acc512c | 538 | .cb_barrier = NULL, |
bf66f18e | 539 | .fqs = rcu_bh_force_quiescent_state, |
0acc512c PM |
540 | .stats = NULL, |
541 | .irq_capable = 1, | |
542 | .name = "rcu_bh_sync" | |
11a14701 JT |
543 | }; |
544 | ||
bdf2a436 PM |
545 | static struct rcu_torture_ops rcu_bh_expedited_ops = { |
546 | .init = rcu_sync_torture_init, | |
547 | .cleanup = NULL, | |
548 | .readlock = rcu_bh_torture_read_lock, | |
549 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
550 | .readunlock = rcu_bh_torture_read_unlock, | |
551 | .completed = rcu_bh_torture_completed, | |
552 | .deferred_free = rcu_sync_torture_deferred_free, | |
553 | .sync = synchronize_rcu_bh_expedited, | |
554 | .cb_barrier = NULL, | |
555 | .fqs = rcu_bh_force_quiescent_state, | |
556 | .stats = NULL, | |
557 | .irq_capable = 1, | |
558 | .name = "rcu_bh_expedited" | |
559 | }; | |
560 | ||
b2896d2e PM |
561 | /* |
562 | * Definitions for srcu torture testing. | |
563 | */ | |
564 | ||
565 | static struct srcu_struct srcu_ctl; | |
b2896d2e PM |
566 | |
567 | static void srcu_torture_init(void) | |
568 | { | |
569 | init_srcu_struct(&srcu_ctl); | |
e3033736 | 570 | rcu_sync_torture_init(); |
b2896d2e PM |
571 | } |
572 | ||
573 | static void srcu_torture_cleanup(void) | |
574 | { | |
575 | synchronize_srcu(&srcu_ctl); | |
576 | cleanup_srcu_struct(&srcu_ctl); | |
577 | } | |
578 | ||
012d3ca8 | 579 | static int srcu_torture_read_lock(void) __acquires(&srcu_ctl) |
b2896d2e PM |
580 | { |
581 | return srcu_read_lock(&srcu_ctl); | |
582 | } | |
583 | ||
584 | static void srcu_read_delay(struct rcu_random_state *rrsp) | |
585 | { | |
586 | long delay; | |
587 | const long uspertick = 1000000 / HZ; | |
588 | const long longdelay = 10; | |
589 | ||
590 | /* We want there to be long-running readers, but not all the time. */ | |
591 | ||
592 | delay = rcu_random(rrsp) % (nrealreaders * 2 * longdelay * uspertick); | |
593 | if (!delay) | |
594 | schedule_timeout_interruptible(longdelay); | |
e546f485 LJ |
595 | else |
596 | rcu_read_delay(rrsp); | |
b2896d2e PM |
597 | } |
598 | ||
012d3ca8 | 599 | static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) |
b2896d2e PM |
600 | { |
601 | srcu_read_unlock(&srcu_ctl, idx); | |
602 | } | |
603 | ||
604 | static int srcu_torture_completed(void) | |
605 | { | |
606 | return srcu_batches_completed(&srcu_ctl); | |
607 | } | |
608 | ||
b772e1dd JT |
609 | static void srcu_torture_synchronize(void) |
610 | { | |
611 | synchronize_srcu(&srcu_ctl); | |
612 | } | |
613 | ||
b2896d2e PM |
614 | static int srcu_torture_stats(char *page) |
615 | { | |
616 | int cnt = 0; | |
617 | int cpu; | |
618 | int idx = srcu_ctl.completed & 0x1; | |
619 | ||
620 | cnt += sprintf(&page[cnt], "%s%s per-CPU(idx=%d):", | |
621 | torture_type, TORTURE_FLAG, idx); | |
622 | for_each_possible_cpu(cpu) { | |
623 | cnt += sprintf(&page[cnt], " %d(%d,%d)", cpu, | |
624 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[!idx], | |
625 | per_cpu_ptr(srcu_ctl.per_cpu_ref, cpu)->c[idx]); | |
626 | } | |
627 | cnt += sprintf(&page[cnt], "\n"); | |
628 | return cnt; | |
629 | } | |
630 | ||
631 | static struct rcu_torture_ops srcu_ops = { | |
0acc512c PM |
632 | .init = srcu_torture_init, |
633 | .cleanup = srcu_torture_cleanup, | |
634 | .readlock = srcu_torture_read_lock, | |
635 | .read_delay = srcu_read_delay, | |
636 | .readunlock = srcu_torture_read_unlock, | |
637 | .completed = srcu_torture_completed, | |
638 | .deferred_free = rcu_sync_torture_deferred_free, | |
639 | .sync = srcu_torture_synchronize, | |
640 | .cb_barrier = NULL, | |
641 | .stats = srcu_torture_stats, | |
642 | .name = "srcu" | |
b2896d2e PM |
643 | }; |
644 | ||
101db7b4 PM |
645 | static int srcu_torture_read_lock_raw(void) __acquires(&srcu_ctl) |
646 | { | |
647 | return srcu_read_lock_raw(&srcu_ctl); | |
648 | } | |
649 | ||
650 | static void srcu_torture_read_unlock_raw(int idx) __releases(&srcu_ctl) | |
651 | { | |
652 | srcu_read_unlock_raw(&srcu_ctl, idx); | |
653 | } | |
654 | ||
655 | static struct rcu_torture_ops srcu_raw_ops = { | |
656 | .init = srcu_torture_init, | |
657 | .cleanup = srcu_torture_cleanup, | |
658 | .readlock = srcu_torture_read_lock_raw, | |
659 | .read_delay = srcu_read_delay, | |
660 | .readunlock = srcu_torture_read_unlock_raw, | |
661 | .completed = srcu_torture_completed, | |
662 | .deferred_free = rcu_sync_torture_deferred_free, | |
663 | .sync = srcu_torture_synchronize, | |
664 | .cb_barrier = NULL, | |
665 | .stats = srcu_torture_stats, | |
666 | .name = "srcu_raw" | |
667 | }; | |
668 | ||
804bb837 PM |
669 | static void srcu_torture_synchronize_expedited(void) |
670 | { | |
671 | synchronize_srcu_expedited(&srcu_ctl); | |
672 | } | |
673 | ||
674 | static struct rcu_torture_ops srcu_expedited_ops = { | |
675 | .init = srcu_torture_init, | |
676 | .cleanup = srcu_torture_cleanup, | |
677 | .readlock = srcu_torture_read_lock, | |
678 | .read_delay = srcu_read_delay, | |
679 | .readunlock = srcu_torture_read_unlock, | |
680 | .completed = srcu_torture_completed, | |
681 | .deferred_free = rcu_sync_torture_deferred_free, | |
682 | .sync = srcu_torture_synchronize_expedited, | |
683 | .cb_barrier = NULL, | |
684 | .stats = srcu_torture_stats, | |
685 | .name = "srcu_expedited" | |
686 | }; | |
687 | ||
4b6c2cca JT |
688 | /* |
689 | * Definitions for sched torture testing. | |
690 | */ | |
691 | ||
692 | static int sched_torture_read_lock(void) | |
693 | { | |
694 | preempt_disable(); | |
695 | return 0; | |
696 | } | |
697 | ||
698 | static void sched_torture_read_unlock(int idx) | |
699 | { | |
700 | preempt_enable(); | |
701 | } | |
702 | ||
2326974d PM |
703 | static void rcu_sched_torture_deferred_free(struct rcu_torture *p) |
704 | { | |
705 | call_rcu_sched(&p->rtort_rcu, rcu_torture_cb); | |
706 | } | |
707 | ||
4b6c2cca | 708 | static struct rcu_torture_ops sched_ops = { |
0acc512c PM |
709 | .init = rcu_sync_torture_init, |
710 | .cleanup = NULL, | |
711 | .readlock = sched_torture_read_lock, | |
712 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
713 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 714 | .completed = rcu_no_completed, |
0acc512c | 715 | .deferred_free = rcu_sched_torture_deferred_free, |
bdf2a436 | 716 | .sync = synchronize_sched, |
0acc512c | 717 | .cb_barrier = rcu_barrier_sched, |
bf66f18e | 718 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
719 | .stats = NULL, |
720 | .irq_capable = 1, | |
721 | .name = "sched" | |
4b6c2cca JT |
722 | }; |
723 | ||
804bb837 | 724 | static struct rcu_torture_ops sched_sync_ops = { |
0acc512c PM |
725 | .init = rcu_sync_torture_init, |
726 | .cleanup = NULL, | |
727 | .readlock = sched_torture_read_lock, | |
728 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
729 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 730 | .completed = rcu_no_completed, |
0acc512c | 731 | .deferred_free = rcu_sync_torture_deferred_free, |
bdf2a436 | 732 | .sync = synchronize_sched, |
0acc512c | 733 | .cb_barrier = NULL, |
bf66f18e | 734 | .fqs = rcu_sched_force_quiescent_state, |
0acc512c PM |
735 | .stats = NULL, |
736 | .name = "sched_sync" | |
737 | }; | |
738 | ||
0acc512c PM |
739 | static struct rcu_torture_ops sched_expedited_ops = { |
740 | .init = rcu_sync_torture_init, | |
741 | .cleanup = NULL, | |
742 | .readlock = sched_torture_read_lock, | |
743 | .read_delay = rcu_read_delay, /* just reuse rcu's version. */ | |
744 | .readunlock = sched_torture_read_unlock, | |
d9a3da06 | 745 | .completed = rcu_no_completed, |
0acc512c PM |
746 | .deferred_free = rcu_sync_torture_deferred_free, |
747 | .sync = synchronize_sched_expedited, | |
748 | .cb_barrier = NULL, | |
bf66f18e | 749 | .fqs = rcu_sched_force_quiescent_state, |
969c7921 | 750 | .stats = NULL, |
0acc512c PM |
751 | .irq_capable = 1, |
752 | .name = "sched_expedited" | |
2326974d PM |
753 | }; |
754 | ||
8e8be45e PM |
755 | /* |
756 | * RCU torture priority-boost testing. Runs one real-time thread per | |
757 | * CPU for moderate bursts, repeatedly registering RCU callbacks and | |
758 | * spinning waiting for them to be invoked. If a given callback takes | |
759 | * too long to be invoked, we assume that priority inversion has occurred. | |
760 | */ | |
761 | ||
762 | struct rcu_boost_inflight { | |
763 | struct rcu_head rcu; | |
764 | int inflight; | |
765 | }; | |
766 | ||
767 | static void rcu_torture_boost_cb(struct rcu_head *head) | |
768 | { | |
769 | struct rcu_boost_inflight *rbip = | |
770 | container_of(head, struct rcu_boost_inflight, rcu); | |
771 | ||
772 | smp_mb(); /* Ensure RCU-core accesses precede clearing ->inflight */ | |
773 | rbip->inflight = 0; | |
774 | } | |
775 | ||
776 | static int rcu_torture_boost(void *arg) | |
777 | { | |
778 | unsigned long call_rcu_time; | |
779 | unsigned long endtime; | |
780 | unsigned long oldstarttime; | |
781 | struct rcu_boost_inflight rbi = { .inflight = 0 }; | |
782 | struct sched_param sp; | |
783 | ||
784 | VERBOSE_PRINTK_STRING("rcu_torture_boost started"); | |
785 | ||
786 | /* Set real-time priority. */ | |
787 | sp.sched_priority = 1; | |
788 | if (sched_setscheduler(current, SCHED_FIFO, &sp) < 0) { | |
789 | VERBOSE_PRINTK_STRING("rcu_torture_boost RT prio failed!"); | |
790 | n_rcu_torture_boost_rterror++; | |
791 | } | |
792 | ||
561190e3 | 793 | init_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
794 | /* Each pass through the following loop does one boost-test cycle. */ |
795 | do { | |
796 | /* Wait for the next test interval. */ | |
797 | oldstarttime = boost_starttime; | |
93898fb1 | 798 | while (ULONG_CMP_LT(jiffies, oldstarttime)) { |
8e8be45e PM |
799 | schedule_timeout_uninterruptible(1); |
800 | rcu_stutter_wait("rcu_torture_boost"); | |
801 | if (kthread_should_stop() || | |
802 | fullstop != FULLSTOP_DONTSTOP) | |
803 | goto checkwait; | |
804 | } | |
805 | ||
806 | /* Do one boost-test interval. */ | |
807 | endtime = oldstarttime + test_boost_duration * HZ; | |
808 | call_rcu_time = jiffies; | |
93898fb1 | 809 | while (ULONG_CMP_LT(jiffies, endtime)) { |
8e8be45e PM |
810 | /* If we don't have a callback in flight, post one. */ |
811 | if (!rbi.inflight) { | |
812 | smp_mb(); /* RCU core before ->inflight = 1. */ | |
813 | rbi.inflight = 1; | |
814 | call_rcu(&rbi.rcu, rcu_torture_boost_cb); | |
815 | if (jiffies - call_rcu_time > | |
816 | test_boost_duration * HZ - HZ / 2) { | |
817 | VERBOSE_PRINTK_STRING("rcu_torture_boost boosting failed"); | |
818 | n_rcu_torture_boost_failure++; | |
819 | } | |
820 | call_rcu_time = jiffies; | |
821 | } | |
822 | cond_resched(); | |
823 | rcu_stutter_wait("rcu_torture_boost"); | |
824 | if (kthread_should_stop() || | |
825 | fullstop != FULLSTOP_DONTSTOP) | |
826 | goto checkwait; | |
827 | } | |
828 | ||
829 | /* | |
830 | * Set the start time of the next test interval. | |
831 | * Yes, this is vulnerable to long delays, but such | |
832 | * delays simply cause a false negative for the next | |
833 | * interval. Besides, we are running at RT priority, | |
834 | * so delays should be relatively rare. | |
835 | */ | |
ab8f11e5 PM |
836 | while (oldstarttime == boost_starttime && |
837 | !kthread_should_stop()) { | |
8e8be45e PM |
838 | if (mutex_trylock(&boost_mutex)) { |
839 | boost_starttime = jiffies + | |
840 | test_boost_interval * HZ; | |
841 | n_rcu_torture_boosts++; | |
842 | mutex_unlock(&boost_mutex); | |
843 | break; | |
844 | } | |
845 | schedule_timeout_uninterruptible(1); | |
846 | } | |
847 | ||
848 | /* Go do the stutter. */ | |
849 | checkwait: rcu_stutter_wait("rcu_torture_boost"); | |
850 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
851 | ||
852 | /* Clean up and exit. */ | |
853 | VERBOSE_PRINTK_STRING("rcu_torture_boost task stopping"); | |
854 | rcutorture_shutdown_absorb("rcu_torture_boost"); | |
855 | while (!kthread_should_stop() || rbi.inflight) | |
856 | schedule_timeout_uninterruptible(1); | |
857 | smp_mb(); /* order accesses to ->inflight before stack-frame death. */ | |
9d68197c | 858 | destroy_rcu_head_on_stack(&rbi.rcu); |
8e8be45e PM |
859 | return 0; |
860 | } | |
861 | ||
bf66f18e PM |
862 | /* |
863 | * RCU torture force-quiescent-state kthread. Repeatedly induces | |
864 | * bursts of calls to force_quiescent_state(), increasing the probability | |
865 | * of occurrence of some important types of race conditions. | |
866 | */ | |
867 | static int | |
868 | rcu_torture_fqs(void *arg) | |
869 | { | |
870 | unsigned long fqs_resume_time; | |
871 | int fqs_burst_remaining; | |
872 | ||
873 | VERBOSE_PRINTK_STRING("rcu_torture_fqs task started"); | |
874 | do { | |
875 | fqs_resume_time = jiffies + fqs_stutter * HZ; | |
93898fb1 PM |
876 | while (ULONG_CMP_LT(jiffies, fqs_resume_time) && |
877 | !kthread_should_stop()) { | |
bf66f18e PM |
878 | schedule_timeout_interruptible(1); |
879 | } | |
880 | fqs_burst_remaining = fqs_duration; | |
93898fb1 PM |
881 | while (fqs_burst_remaining > 0 && |
882 | !kthread_should_stop()) { | |
bf66f18e PM |
883 | cur_ops->fqs(); |
884 | udelay(fqs_holdoff); | |
885 | fqs_burst_remaining -= fqs_holdoff; | |
886 | } | |
887 | rcu_stutter_wait("rcu_torture_fqs"); | |
888 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
889 | VERBOSE_PRINTK_STRING("rcu_torture_fqs task stopping"); | |
890 | rcutorture_shutdown_absorb("rcu_torture_fqs"); | |
891 | while (!kthread_should_stop()) | |
892 | schedule_timeout_uninterruptible(1); | |
893 | return 0; | |
894 | } | |
895 | ||
a241ec65 PM |
896 | /* |
897 | * RCU torture writer kthread. Repeatedly substitutes a new structure | |
898 | * for that pointed to by rcu_torture_current, freeing the old structure | |
899 | * after a series of grace periods (the "pipeline"). | |
900 | */ | |
901 | static int | |
902 | rcu_torture_writer(void *arg) | |
903 | { | |
904 | int i; | |
905 | long oldbatch = rcu_batches_completed(); | |
906 | struct rcu_torture *rp; | |
907 | struct rcu_torture *old_rp; | |
908 | static DEFINE_RCU_RANDOM(rand); | |
909 | ||
910 | VERBOSE_PRINTK_STRING("rcu_torture_writer task started"); | |
dbdf65b1 IM |
911 | set_user_nice(current, 19); |
912 | ||
a241ec65 PM |
913 | do { |
914 | schedule_timeout_uninterruptible(1); | |
a71fca58 PM |
915 | rp = rcu_torture_alloc(); |
916 | if (rp == NULL) | |
a241ec65 PM |
917 | continue; |
918 | rp->rtort_pipe_count = 0; | |
919 | udelay(rcu_random(&rand) & 0x3ff); | |
0ddea0ea PM |
920 | old_rp = rcu_dereference_check(rcu_torture_current, |
921 | current == writer_task); | |
996417d2 | 922 | rp->rtort_mbtest = 1; |
a241ec65 | 923 | rcu_assign_pointer(rcu_torture_current, rp); |
9b2619af | 924 | smp_wmb(); /* Mods to old_rp must follow rcu_assign_pointer() */ |
c8e5b163 | 925 | if (old_rp) { |
a241ec65 PM |
926 | i = old_rp->rtort_pipe_count; |
927 | if (i > RCU_TORTURE_PIPE_LEN) | |
928 | i = RCU_TORTURE_PIPE_LEN; | |
929 | atomic_inc(&rcu_torture_wcount[i]); | |
930 | old_rp->rtort_pipe_count++; | |
0acc512c | 931 | cur_ops->deferred_free(old_rp); |
a241ec65 | 932 | } |
4a298656 | 933 | rcutorture_record_progress(++rcu_torture_current_version); |
72e9bb54 | 934 | oldbatch = cur_ops->completed(); |
c9d557c1 PM |
935 | rcu_stutter_wait("rcu_torture_writer"); |
936 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
a241ec65 | 937 | VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping"); |
c9d557c1 PM |
938 | rcutorture_shutdown_absorb("rcu_torture_writer"); |
939 | while (!kthread_should_stop()) | |
a241ec65 PM |
940 | schedule_timeout_uninterruptible(1); |
941 | return 0; | |
942 | } | |
943 | ||
b772e1dd JT |
944 | /* |
945 | * RCU torture fake writer kthread. Repeatedly calls sync, with a random | |
946 | * delay between calls. | |
947 | */ | |
948 | static int | |
949 | rcu_torture_fakewriter(void *arg) | |
950 | { | |
951 | DEFINE_RCU_RANDOM(rand); | |
952 | ||
953 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started"); | |
954 | set_user_nice(current, 19); | |
955 | ||
956 | do { | |
957 | schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10); | |
958 | udelay(rcu_random(&rand) & 0x3ff); | |
959 | cur_ops->sync(); | |
c9d557c1 PM |
960 | rcu_stutter_wait("rcu_torture_fakewriter"); |
961 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
b772e1dd JT |
962 | |
963 | VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); | |
c9d557c1 PM |
964 | rcutorture_shutdown_absorb("rcu_torture_fakewriter"); |
965 | while (!kthread_should_stop()) | |
b772e1dd JT |
966 | schedule_timeout_uninterruptible(1); |
967 | return 0; | |
968 | } | |
969 | ||
91afaf30 PM |
970 | void rcutorture_trace_dump(void) |
971 | { | |
972 | static atomic_t beenhere = ATOMIC_INIT(0); | |
973 | ||
974 | if (atomic_read(&beenhere)) | |
975 | return; | |
976 | if (atomic_xchg(&beenhere, 1) != 0) | |
977 | return; | |
978 | do_trace_rcu_torture_read(cur_ops->name, (struct rcu_head *)~0UL); | |
979 | ftrace_dump(DUMP_ALL); | |
980 | } | |
981 | ||
0729fbf3 PM |
982 | /* |
983 | * RCU torture reader from timer handler. Dereferences rcu_torture_current, | |
984 | * incrementing the corresponding element of the pipeline array. The | |
985 | * counter in the element should never be greater than 1, otherwise, the | |
986 | * RCU implementation is broken. | |
987 | */ | |
988 | static void rcu_torture_timer(unsigned long unused) | |
989 | { | |
990 | int idx; | |
991 | int completed; | |
992 | static DEFINE_RCU_RANDOM(rand); | |
993 | static DEFINE_SPINLOCK(rand_lock); | |
994 | struct rcu_torture *p; | |
995 | int pipe_count; | |
996 | ||
997 | idx = cur_ops->readlock(); | |
998 | completed = cur_ops->completed(); | |
632ee200 | 999 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1000 | rcu_read_lock_bh_held() || |
1001 | rcu_read_lock_sched_held() || | |
1002 | srcu_read_lock_held(&srcu_ctl)); | |
0729fbf3 PM |
1003 | if (p == NULL) { |
1004 | /* Leave because rcu_torture_writer is not yet underway */ | |
1005 | cur_ops->readunlock(idx); | |
1006 | return; | |
1007 | } | |
7129d383 | 1008 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu); |
0729fbf3 PM |
1009 | if (p->rtort_mbtest == 0) |
1010 | atomic_inc(&n_rcu_torture_mberror); | |
1011 | spin_lock(&rand_lock); | |
0acc512c | 1012 | cur_ops->read_delay(&rand); |
0729fbf3 PM |
1013 | n_rcu_torture_timers++; |
1014 | spin_unlock(&rand_lock); | |
1015 | preempt_disable(); | |
1016 | pipe_count = p->rtort_pipe_count; | |
1017 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1018 | /* Should not happen, but... */ | |
1019 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1020 | } | |
91afaf30 PM |
1021 | if (pipe_count > 1) |
1022 | rcutorture_trace_dump(); | |
dd17c8f7 | 1023 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
0729fbf3 PM |
1024 | completed = cur_ops->completed() - completed; |
1025 | if (completed > RCU_TORTURE_PIPE_LEN) { | |
1026 | /* Should not happen, but... */ | |
1027 | completed = RCU_TORTURE_PIPE_LEN; | |
1028 | } | |
dd17c8f7 | 1029 | __this_cpu_inc(rcu_torture_batch[completed]); |
0729fbf3 PM |
1030 | preempt_enable(); |
1031 | cur_ops->readunlock(idx); | |
1032 | } | |
1033 | ||
a241ec65 PM |
1034 | /* |
1035 | * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, | |
1036 | * incrementing the corresponding element of the pipeline array. The | |
1037 | * counter in the element should never be greater than 1, otherwise, the | |
1038 | * RCU implementation is broken. | |
1039 | */ | |
1040 | static int | |
1041 | rcu_torture_reader(void *arg) | |
1042 | { | |
1043 | int completed; | |
72e9bb54 | 1044 | int idx; |
a241ec65 PM |
1045 | DEFINE_RCU_RANDOM(rand); |
1046 | struct rcu_torture *p; | |
1047 | int pipe_count; | |
0729fbf3 | 1048 | struct timer_list t; |
a241ec65 PM |
1049 | |
1050 | VERBOSE_PRINTK_STRING("rcu_torture_reader task started"); | |
dbdf65b1 | 1051 | set_user_nice(current, 19); |
0acc512c | 1052 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1053 | setup_timer_on_stack(&t, rcu_torture_timer, 0); |
dbdf65b1 | 1054 | |
a241ec65 | 1055 | do { |
0acc512c | 1056 | if (irqreader && cur_ops->irq_capable) { |
0729fbf3 | 1057 | if (!timer_pending(&t)) |
6155fec9 | 1058 | mod_timer(&t, jiffies + 1); |
0729fbf3 | 1059 | } |
72e9bb54 PM |
1060 | idx = cur_ops->readlock(); |
1061 | completed = cur_ops->completed(); | |
632ee200 | 1062 | p = rcu_dereference_check(rcu_torture_current, |
632ee200 PM |
1063 | rcu_read_lock_bh_held() || |
1064 | rcu_read_lock_sched_held() || | |
1065 | srcu_read_lock_held(&srcu_ctl)); | |
a241ec65 PM |
1066 | if (p == NULL) { |
1067 | /* Wait for rcu_torture_writer to get underway */ | |
72e9bb54 | 1068 | cur_ops->readunlock(idx); |
a241ec65 PM |
1069 | schedule_timeout_interruptible(HZ); |
1070 | continue; | |
1071 | } | |
7129d383 | 1072 | do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu); |
996417d2 PM |
1073 | if (p->rtort_mbtest == 0) |
1074 | atomic_inc(&n_rcu_torture_mberror); | |
0acc512c | 1075 | cur_ops->read_delay(&rand); |
a241ec65 PM |
1076 | preempt_disable(); |
1077 | pipe_count = p->rtort_pipe_count; | |
1078 | if (pipe_count > RCU_TORTURE_PIPE_LEN) { | |
1079 | /* Should not happen, but... */ | |
1080 | pipe_count = RCU_TORTURE_PIPE_LEN; | |
1081 | } | |
91afaf30 PM |
1082 | if (pipe_count > 1) |
1083 | rcutorture_trace_dump(); | |
dd17c8f7 | 1084 | __this_cpu_inc(rcu_torture_count[pipe_count]); |
72e9bb54 | 1085 | completed = cur_ops->completed() - completed; |
a241ec65 PM |
1086 | if (completed > RCU_TORTURE_PIPE_LEN) { |
1087 | /* Should not happen, but... */ | |
1088 | completed = RCU_TORTURE_PIPE_LEN; | |
1089 | } | |
dd17c8f7 | 1090 | __this_cpu_inc(rcu_torture_batch[completed]); |
a241ec65 | 1091 | preempt_enable(); |
72e9bb54 | 1092 | cur_ops->readunlock(idx); |
a241ec65 | 1093 | schedule(); |
c9d557c1 PM |
1094 | rcu_stutter_wait("rcu_torture_reader"); |
1095 | } while (!kthread_should_stop() && fullstop == FULLSTOP_DONTSTOP); | |
a241ec65 | 1096 | VERBOSE_PRINTK_STRING("rcu_torture_reader task stopping"); |
c9d557c1 | 1097 | rcutorture_shutdown_absorb("rcu_torture_reader"); |
0acc512c | 1098 | if (irqreader && cur_ops->irq_capable) |
0729fbf3 | 1099 | del_timer_sync(&t); |
c9d557c1 | 1100 | while (!kthread_should_stop()) |
a241ec65 PM |
1101 | schedule_timeout_uninterruptible(1); |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * Create an RCU-torture statistics message in the specified buffer. | |
1107 | */ | |
1108 | static int | |
1109 | rcu_torture_printk(char *page) | |
1110 | { | |
1111 | int cnt = 0; | |
1112 | int cpu; | |
1113 | int i; | |
1114 | long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1115 | long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 }; | |
1116 | ||
0a945022 | 1117 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1118 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1119 | pipesummary[i] += per_cpu(rcu_torture_count, cpu)[i]; | |
1120 | batchsummary[i] += per_cpu(rcu_torture_batch, cpu)[i]; | |
1121 | } | |
1122 | } | |
1123 | for (i = RCU_TORTURE_PIPE_LEN - 1; i >= 0; i--) { | |
1124 | if (pipesummary[i] != 0) | |
1125 | break; | |
1126 | } | |
72e9bb54 | 1127 | cnt += sprintf(&page[cnt], "%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 | 1128 | cnt += sprintf(&page[cnt], |
4a298656 | 1129 | "rtc: %p ver: %lu tfle: %d rta: %d rtaf: %d rtf: %d " |
67b98dba | 1130 | "rtmbe: %d rtbke: %ld rtbre: %ld " |
b58bdcca PM |
1131 | "rtbf: %ld rtb: %ld nt: %ld " |
1132 | "onoff: %ld/%ld:%ld/%ld", | |
a241ec65 PM |
1133 | rcu_torture_current, |
1134 | rcu_torture_current_version, | |
1135 | list_empty(&rcu_torture_freelist), | |
1136 | atomic_read(&n_rcu_torture_alloc), | |
1137 | atomic_read(&n_rcu_torture_alloc_fail), | |
996417d2 | 1138 | atomic_read(&n_rcu_torture_free), |
0729fbf3 | 1139 | atomic_read(&n_rcu_torture_mberror), |
8e8be45e PM |
1140 | n_rcu_torture_boost_ktrerror, |
1141 | n_rcu_torture_boost_rterror, | |
8e8be45e PM |
1142 | n_rcu_torture_boost_failure, |
1143 | n_rcu_torture_boosts, | |
b58bdcca PM |
1144 | n_rcu_torture_timers, |
1145 | n_online_successes, | |
1146 | n_online_attempts, | |
1147 | n_offline_successes, | |
1148 | n_offline_attempts); | |
8e8be45e PM |
1149 | if (atomic_read(&n_rcu_torture_mberror) != 0 || |
1150 | n_rcu_torture_boost_ktrerror != 0 || | |
1151 | n_rcu_torture_boost_rterror != 0 || | |
8e8be45e | 1152 | n_rcu_torture_boost_failure != 0) |
996417d2 | 1153 | cnt += sprintf(&page[cnt], " !!!"); |
72e9bb54 | 1154 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
996417d2 | 1155 | if (i > 1) { |
a241ec65 | 1156 | cnt += sprintf(&page[cnt], "!!! "); |
996417d2 | 1157 | atomic_inc(&n_rcu_torture_error); |
5af970a4 | 1158 | WARN_ON_ONCE(1); |
996417d2 | 1159 | } |
a241ec65 PM |
1160 | cnt += sprintf(&page[cnt], "Reader Pipe: "); |
1161 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) | |
1162 | cnt += sprintf(&page[cnt], " %ld", pipesummary[i]); | |
72e9bb54 | 1163 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 | 1164 | cnt += sprintf(&page[cnt], "Reader Batch: "); |
72e9bb54 | 1165 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
a241ec65 | 1166 | cnt += sprintf(&page[cnt], " %ld", batchsummary[i]); |
72e9bb54 | 1167 | cnt += sprintf(&page[cnt], "\n%s%s ", torture_type, TORTURE_FLAG); |
a241ec65 PM |
1168 | cnt += sprintf(&page[cnt], "Free-Block Circulation: "); |
1169 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { | |
1170 | cnt += sprintf(&page[cnt], " %d", | |
1171 | atomic_read(&rcu_torture_wcount[i])); | |
1172 | } | |
1173 | cnt += sprintf(&page[cnt], "\n"); | |
c8e5b163 | 1174 | if (cur_ops->stats) |
72e9bb54 | 1175 | cnt += cur_ops->stats(&page[cnt]); |
a241ec65 PM |
1176 | return cnt; |
1177 | } | |
1178 | ||
1179 | /* | |
1180 | * Print torture statistics. Caller must ensure that there is only | |
1181 | * one call to this function at a given time!!! This is normally | |
1182 | * accomplished by relying on the module system to only have one copy | |
1183 | * of the module loaded, and then by giving the rcu_torture_stats | |
1184 | * kthread full control (or the init/cleanup functions when rcu_torture_stats | |
1185 | * thread is not running). | |
1186 | */ | |
1187 | static void | |
1188 | rcu_torture_stats_print(void) | |
1189 | { | |
1190 | int cnt; | |
1191 | ||
1192 | cnt = rcu_torture_printk(printk_buf); | |
1193 | printk(KERN_ALERT "%s", printk_buf); | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * Periodically prints torture statistics, if periodic statistics printing | |
1198 | * was specified via the stat_interval module parameter. | |
1199 | * | |
1200 | * No need to worry about fullstop here, since this one doesn't reference | |
1201 | * volatile state or register callbacks. | |
1202 | */ | |
1203 | static int | |
1204 | rcu_torture_stats(void *arg) | |
1205 | { | |
1206 | VERBOSE_PRINTK_STRING("rcu_torture_stats task started"); | |
1207 | do { | |
1208 | schedule_timeout_interruptible(stat_interval * HZ); | |
1209 | rcu_torture_stats_print(); | |
c9d557c1 PM |
1210 | rcutorture_shutdown_absorb("rcu_torture_stats"); |
1211 | } while (!kthread_should_stop()); | |
a241ec65 PM |
1212 | VERBOSE_PRINTK_STRING("rcu_torture_stats task stopping"); |
1213 | return 0; | |
1214 | } | |
1215 | ||
d84f5203 SV |
1216 | static int rcu_idle_cpu; /* Force all torture tasks off this CPU */ |
1217 | ||
1218 | /* Shuffle tasks such that we allow @rcu_idle_cpu to become idle. A special case | |
1219 | * is when @rcu_idle_cpu = -1, when we allow the tasks to run on all CPUs. | |
1220 | */ | |
b2896d2e | 1221 | static void rcu_torture_shuffle_tasks(void) |
d84f5203 | 1222 | { |
d84f5203 SV |
1223 | int i; |
1224 | ||
73d0a4b1 | 1225 | cpumask_setall(shuffle_tmp_mask); |
86ef5c9a | 1226 | get_online_cpus(); |
d84f5203 SV |
1227 | |
1228 | /* No point in shuffling if there is only one online CPU (ex: UP) */ | |
c9d557c1 PM |
1229 | if (num_online_cpus() == 1) { |
1230 | put_online_cpus(); | |
1231 | return; | |
1232 | } | |
d84f5203 SV |
1233 | |
1234 | if (rcu_idle_cpu != -1) | |
73d0a4b1 | 1235 | cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask); |
d84f5203 | 1236 | |
73d0a4b1 | 1237 | set_cpus_allowed_ptr(current, shuffle_tmp_mask); |
d84f5203 | 1238 | |
c8e5b163 | 1239 | if (reader_tasks) { |
d84f5203 SV |
1240 | for (i = 0; i < nrealreaders; i++) |
1241 | if (reader_tasks[i]) | |
f70316da | 1242 | set_cpus_allowed_ptr(reader_tasks[i], |
73d0a4b1 | 1243 | shuffle_tmp_mask); |
d84f5203 SV |
1244 | } |
1245 | ||
c8e5b163 | 1246 | if (fakewriter_tasks) { |
b772e1dd JT |
1247 | for (i = 0; i < nfakewriters; i++) |
1248 | if (fakewriter_tasks[i]) | |
f70316da | 1249 | set_cpus_allowed_ptr(fakewriter_tasks[i], |
73d0a4b1 | 1250 | shuffle_tmp_mask); |
b772e1dd JT |
1251 | } |
1252 | ||
d84f5203 | 1253 | if (writer_task) |
73d0a4b1 | 1254 | set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask); |
d84f5203 SV |
1255 | |
1256 | if (stats_task) | |
73d0a4b1 | 1257 | set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask); |
d84f5203 SV |
1258 | |
1259 | if (rcu_idle_cpu == -1) | |
1260 | rcu_idle_cpu = num_online_cpus() - 1; | |
1261 | else | |
1262 | rcu_idle_cpu--; | |
1263 | ||
86ef5c9a | 1264 | put_online_cpus(); |
d84f5203 SV |
1265 | } |
1266 | ||
1267 | /* Shuffle tasks across CPUs, with the intent of allowing each CPU in the | |
1268 | * system to become idle at a time and cut off its timer ticks. This is meant | |
1269 | * to test the support for such tickless idle CPU in RCU. | |
1270 | */ | |
1271 | static int | |
1272 | rcu_torture_shuffle(void *arg) | |
1273 | { | |
1274 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task started"); | |
1275 | do { | |
1276 | schedule_timeout_interruptible(shuffle_interval * HZ); | |
1277 | rcu_torture_shuffle_tasks(); | |
c9d557c1 PM |
1278 | rcutorture_shutdown_absorb("rcu_torture_shuffle"); |
1279 | } while (!kthread_should_stop()); | |
d84f5203 SV |
1280 | VERBOSE_PRINTK_STRING("rcu_torture_shuffle task stopping"); |
1281 | return 0; | |
1282 | } | |
1283 | ||
d120f65f PM |
1284 | /* Cause the rcutorture test to "stutter", starting and stopping all |
1285 | * threads periodically. | |
1286 | */ | |
1287 | static int | |
1288 | rcu_torture_stutter(void *arg) | |
1289 | { | |
1290 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task started"); | |
1291 | do { | |
1292 | schedule_timeout_interruptible(stutter * HZ); | |
1293 | stutter_pause_test = 1; | |
c9d557c1 | 1294 | if (!kthread_should_stop()) |
d120f65f PM |
1295 | schedule_timeout_interruptible(stutter * HZ); |
1296 | stutter_pause_test = 0; | |
c9d557c1 PM |
1297 | rcutorture_shutdown_absorb("rcu_torture_stutter"); |
1298 | } while (!kthread_should_stop()); | |
d120f65f PM |
1299 | VERBOSE_PRINTK_STRING("rcu_torture_stutter task stopping"); |
1300 | return 0; | |
1301 | } | |
1302 | ||
95c38322 | 1303 | static inline void |
8e8be45e | 1304 | rcu_torture_print_module_parms(struct rcu_torture_ops *cur_ops, char *tag) |
95c38322 | 1305 | { |
b772e1dd JT |
1306 | printk(KERN_ALERT "%s" TORTURE_FLAG |
1307 | "--- %s: nreaders=%d nfakewriters=%d " | |
95c38322 | 1308 | "stat_interval=%d verbose=%d test_no_idle_hz=%d " |
bf66f18e | 1309 | "shuffle_interval=%d stutter=%d irqreader=%d " |
8e8be45e PM |
1310 | "fqs_duration=%d fqs_holdoff=%d fqs_stutter=%d " |
1311 | "test_boost=%d/%d test_boost_interval=%d " | |
b58bdcca | 1312 | "test_boost_duration=%d shutdown_secs=%d " |
9b9ec9b9 | 1313 | "onoff_interval=%d onoff_holdoff=%d\n", |
b772e1dd | 1314 | torture_type, tag, nrealreaders, nfakewriters, |
d120f65f | 1315 | stat_interval, verbose, test_no_idle_hz, shuffle_interval, |
8e8be45e PM |
1316 | stutter, irqreader, fqs_duration, fqs_holdoff, fqs_stutter, |
1317 | test_boost, cur_ops->can_boost, | |
b58bdcca | 1318 | test_boost_interval, test_boost_duration, shutdown_secs, |
9b9ec9b9 | 1319 | onoff_interval, onoff_holdoff); |
95c38322 PM |
1320 | } |
1321 | ||
8e8be45e | 1322 | static struct notifier_block rcutorture_shutdown_nb = { |
343e9099 PM |
1323 | .notifier_call = rcutorture_shutdown_notify, |
1324 | }; | |
1325 | ||
8e8be45e PM |
1326 | static void rcutorture_booster_cleanup(int cpu) |
1327 | { | |
1328 | struct task_struct *t; | |
1329 | ||
1330 | if (boost_tasks[cpu] == NULL) | |
1331 | return; | |
1332 | mutex_lock(&boost_mutex); | |
1333 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_boost task"); | |
1334 | t = boost_tasks[cpu]; | |
1335 | boost_tasks[cpu] = NULL; | |
1336 | mutex_unlock(&boost_mutex); | |
1337 | ||
1338 | /* This must be outside of the mutex, otherwise deadlock! */ | |
1339 | kthread_stop(t); | |
1340 | } | |
1341 | ||
1342 | static int rcutorture_booster_init(int cpu) | |
1343 | { | |
1344 | int retval; | |
1345 | ||
1346 | if (boost_tasks[cpu] != NULL) | |
1347 | return 0; /* Already created, nothing more to do. */ | |
1348 | ||
1349 | /* Don't allow time recalculation while creating a new task. */ | |
1350 | mutex_lock(&boost_mutex); | |
1351 | VERBOSE_PRINTK_STRING("Creating rcu_torture_boost task"); | |
1f288094 ED |
1352 | boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL, |
1353 | cpu_to_node(cpu), | |
1354 | "rcu_torture_boost"); | |
8e8be45e PM |
1355 | if (IS_ERR(boost_tasks[cpu])) { |
1356 | retval = PTR_ERR(boost_tasks[cpu]); | |
1357 | VERBOSE_PRINTK_STRING("rcu_torture_boost task create failed"); | |
1358 | n_rcu_torture_boost_ktrerror++; | |
1359 | boost_tasks[cpu] = NULL; | |
1360 | mutex_unlock(&boost_mutex); | |
1361 | return retval; | |
1362 | } | |
1363 | kthread_bind(boost_tasks[cpu], cpu); | |
1364 | wake_up_process(boost_tasks[cpu]); | |
1365 | mutex_unlock(&boost_mutex); | |
1366 | return 0; | |
1367 | } | |
1368 | ||
d5f546d8 PM |
1369 | /* |
1370 | * Cause the rcutorture test to shutdown the system after the test has | |
1371 | * run for the time specified by the shutdown_secs module parameter. | |
1372 | */ | |
1373 | static int | |
1374 | rcu_torture_shutdown(void *arg) | |
1375 | { | |
1376 | long delta; | |
1377 | unsigned long jiffies_snap; | |
1378 | ||
1379 | VERBOSE_PRINTK_STRING("rcu_torture_shutdown task started"); | |
1380 | jiffies_snap = ACCESS_ONCE(jiffies); | |
1381 | while (ULONG_CMP_LT(jiffies_snap, shutdown_time) && | |
1382 | !kthread_should_stop()) { | |
1383 | delta = shutdown_time - jiffies_snap; | |
1384 | if (verbose) | |
1385 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1386 | "rcu_torture_shutdown task: %lu " | |
1387 | "jiffies remaining\n", | |
1388 | torture_type, delta); | |
1389 | schedule_timeout_interruptible(delta); | |
1390 | jiffies_snap = ACCESS_ONCE(jiffies); | |
1391 | } | |
b58bdcca | 1392 | if (kthread_should_stop()) { |
d5f546d8 PM |
1393 | VERBOSE_PRINTK_STRING("rcu_torture_shutdown task stopping"); |
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | /* OK, shut down the system. */ | |
1398 | ||
1399 | VERBOSE_PRINTK_STRING("rcu_torture_shutdown task shutting down system"); | |
1400 | shutdown_task = NULL; /* Avoid self-kill deadlock. */ | |
1401 | rcu_torture_cleanup(); /* Get the success/failure message. */ | |
1402 | kernel_power_off(); /* Shut down the system. */ | |
1403 | return 0; | |
1404 | } | |
1405 | ||
b58bdcca PM |
1406 | #ifdef CONFIG_HOTPLUG_CPU |
1407 | ||
1408 | /* | |
1409 | * Execute random CPU-hotplug operations at the interval specified | |
1410 | * by the onoff_interval. | |
1411 | */ | |
44100306 | 1412 | static int __cpuinit |
b58bdcca PM |
1413 | rcu_torture_onoff(void *arg) |
1414 | { | |
1415 | int cpu; | |
1416 | int maxcpu = -1; | |
1417 | DEFINE_RCU_RANDOM(rand); | |
1418 | ||
1419 | VERBOSE_PRINTK_STRING("rcu_torture_onoff task started"); | |
1420 | for_each_online_cpu(cpu) | |
1421 | maxcpu = cpu; | |
1422 | WARN_ON(maxcpu < 0); | |
9b9ec9b9 PM |
1423 | if (onoff_holdoff > 0) { |
1424 | VERBOSE_PRINTK_STRING("rcu_torture_onoff begin holdoff"); | |
1425 | schedule_timeout_interruptible(onoff_holdoff * HZ); | |
1426 | VERBOSE_PRINTK_STRING("rcu_torture_onoff end holdoff"); | |
1427 | } | |
b58bdcca PM |
1428 | while (!kthread_should_stop()) { |
1429 | cpu = (rcu_random(&rand) >> 4) % (maxcpu + 1); | |
f220242a | 1430 | if (cpu_online(cpu) && cpu_is_hotpluggable(cpu)) { |
b58bdcca PM |
1431 | if (verbose) |
1432 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1433 | "rcu_torture_onoff task: offlining %d\n", | |
1434 | torture_type, cpu); | |
1435 | n_offline_attempts++; | |
1436 | if (cpu_down(cpu) == 0) { | |
1437 | if (verbose) | |
1438 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1439 | "rcu_torture_onoff task: " | |
1440 | "offlined %d\n", | |
1441 | torture_type, cpu); | |
1442 | n_offline_successes++; | |
1443 | } | |
f220242a | 1444 | } else if (cpu_is_hotpluggable(cpu)) { |
b58bdcca PM |
1445 | if (verbose) |
1446 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1447 | "rcu_torture_onoff task: onlining %d\n", | |
1448 | torture_type, cpu); | |
1449 | n_online_attempts++; | |
1450 | if (cpu_up(cpu) == 0) { | |
1451 | if (verbose) | |
1452 | printk(KERN_ALERT "%s" TORTURE_FLAG | |
1453 | "rcu_torture_onoff task: " | |
1454 | "onlined %d\n", | |
1455 | torture_type, cpu); | |
1456 | n_online_successes++; | |
1457 | } | |
1458 | } | |
1459 | schedule_timeout_interruptible(onoff_interval * HZ); | |
1460 | } | |
1461 | VERBOSE_PRINTK_STRING("rcu_torture_onoff task stopping"); | |
1462 | return 0; | |
1463 | } | |
1464 | ||
44100306 | 1465 | static int __cpuinit |
b58bdcca PM |
1466 | rcu_torture_onoff_init(void) |
1467 | { | |
3c1b1ce0 JL |
1468 | int ret; |
1469 | ||
b58bdcca PM |
1470 | if (onoff_interval <= 0) |
1471 | return 0; | |
1472 | onoff_task = kthread_run(rcu_torture_onoff, NULL, "rcu_torture_onoff"); | |
1473 | if (IS_ERR(onoff_task)) { | |
3c1b1ce0 | 1474 | ret = PTR_ERR(onoff_task); |
b58bdcca | 1475 | onoff_task = NULL; |
3c1b1ce0 | 1476 | return ret; |
b58bdcca PM |
1477 | } |
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | static void rcu_torture_onoff_cleanup(void) | |
1482 | { | |
1483 | if (onoff_task == NULL) | |
1484 | return; | |
1485 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_onoff task"); | |
1486 | kthread_stop(onoff_task); | |
1487 | } | |
1488 | ||
1489 | #else /* #ifdef CONFIG_HOTPLUG_CPU */ | |
1490 | ||
1491 | static void | |
1492 | rcu_torture_onoff_init(void) | |
1493 | { | |
1494 | } | |
1495 | ||
1496 | static void rcu_torture_onoff_cleanup(void) | |
1497 | { | |
1498 | } | |
1499 | ||
1500 | #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */ | |
1501 | ||
c13f3757 PM |
1502 | /* |
1503 | * CPU-stall kthread. It waits as specified by stall_cpu_holdoff, then | |
1504 | * induces a CPU stall for the time specified by stall_cpu. | |
1505 | */ | |
1506 | static int __cpuinit rcu_torture_stall(void *args) | |
1507 | { | |
1508 | unsigned long stop_at; | |
1509 | ||
1510 | VERBOSE_PRINTK_STRING("rcu_torture_stall task started"); | |
1511 | if (stall_cpu_holdoff > 0) { | |
1512 | VERBOSE_PRINTK_STRING("rcu_torture_stall begin holdoff"); | |
1513 | schedule_timeout_interruptible(stall_cpu_holdoff * HZ); | |
1514 | VERBOSE_PRINTK_STRING("rcu_torture_stall end holdoff"); | |
1515 | } | |
1516 | if (!kthread_should_stop()) { | |
1517 | stop_at = get_seconds() + stall_cpu; | |
1518 | /* RCU CPU stall is expected behavior in following code. */ | |
1519 | printk(KERN_ALERT "rcu_torture_stall start.\n"); | |
1520 | rcu_read_lock(); | |
1521 | preempt_disable(); | |
1522 | while (ULONG_CMP_LT(get_seconds(), stop_at)) | |
1523 | continue; /* Induce RCU CPU stall warning. */ | |
1524 | preempt_enable(); | |
1525 | rcu_read_unlock(); | |
1526 | printk(KERN_ALERT "rcu_torture_stall end.\n"); | |
1527 | } | |
1528 | rcutorture_shutdown_absorb("rcu_torture_stall"); | |
1529 | while (!kthread_should_stop()) | |
1530 | schedule_timeout_interruptible(10 * HZ); | |
1531 | return 0; | |
1532 | } | |
1533 | ||
1534 | /* Spawn CPU-stall kthread, if stall_cpu specified. */ | |
1535 | static int __init rcu_torture_stall_init(void) | |
1536 | { | |
1537 | int ret; | |
1538 | ||
1539 | if (stall_cpu <= 0) | |
1540 | return 0; | |
1541 | stall_task = kthread_run(rcu_torture_stall, NULL, "rcu_torture_stall"); | |
1542 | if (IS_ERR(stall_task)) { | |
1543 | ret = PTR_ERR(stall_task); | |
1544 | stall_task = NULL; | |
1545 | return ret; | |
1546 | } | |
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | /* Clean up after the CPU-stall kthread, if one was spawned. */ | |
1551 | static void rcu_torture_stall_cleanup(void) | |
1552 | { | |
1553 | if (stall_task == NULL) | |
1554 | return; | |
1555 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stall_task."); | |
1556 | kthread_stop(stall_task); | |
1557 | } | |
1558 | ||
8e8be45e PM |
1559 | static int rcutorture_cpu_notify(struct notifier_block *self, |
1560 | unsigned long action, void *hcpu) | |
1561 | { | |
1562 | long cpu = (long)hcpu; | |
1563 | ||
1564 | switch (action) { | |
1565 | case CPU_ONLINE: | |
1566 | case CPU_DOWN_FAILED: | |
1567 | (void)rcutorture_booster_init(cpu); | |
1568 | break; | |
1569 | case CPU_DOWN_PREPARE: | |
1570 | rcutorture_booster_cleanup(cpu); | |
1571 | break; | |
1572 | default: | |
1573 | break; | |
1574 | } | |
1575 | return NOTIFY_OK; | |
1576 | } | |
1577 | ||
1578 | static struct notifier_block rcutorture_cpu_nb = { | |
1579 | .notifier_call = rcutorture_cpu_notify, | |
1580 | }; | |
1581 | ||
a241ec65 PM |
1582 | static void |
1583 | rcu_torture_cleanup(void) | |
1584 | { | |
1585 | int i; | |
1586 | ||
343e9099 | 1587 | mutex_lock(&fullstop_mutex); |
4a298656 | 1588 | rcutorture_record_test_transition(); |
c9d557c1 PM |
1589 | if (fullstop == FULLSTOP_SHUTDOWN) { |
1590 | printk(KERN_WARNING /* but going down anyway, so... */ | |
1591 | "Concurrent 'rmmod rcutorture' and shutdown illegal!\n"); | |
343e9099 | 1592 | mutex_unlock(&fullstop_mutex); |
c9d557c1 | 1593 | schedule_timeout_uninterruptible(10); |
343e9099 PM |
1594 | if (cur_ops->cb_barrier != NULL) |
1595 | cur_ops->cb_barrier(); | |
1596 | return; | |
1597 | } | |
c9d557c1 | 1598 | fullstop = FULLSTOP_RMMOD; |
343e9099 | 1599 | mutex_unlock(&fullstop_mutex); |
8e8be45e | 1600 | unregister_reboot_notifier(&rcutorture_shutdown_nb); |
c13f3757 | 1601 | rcu_torture_stall_cleanup(); |
d120f65f PM |
1602 | if (stutter_task) { |
1603 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stutter task"); | |
1604 | kthread_stop(stutter_task); | |
1605 | } | |
1606 | stutter_task = NULL; | |
c8e5b163 | 1607 | if (shuffler_task) { |
d84f5203 SV |
1608 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task"); |
1609 | kthread_stop(shuffler_task); | |
73d0a4b1 | 1610 | free_cpumask_var(shuffle_tmp_mask); |
d84f5203 SV |
1611 | } |
1612 | shuffler_task = NULL; | |
1613 | ||
c8e5b163 | 1614 | if (writer_task) { |
a241ec65 PM |
1615 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_writer task"); |
1616 | kthread_stop(writer_task); | |
1617 | } | |
1618 | writer_task = NULL; | |
1619 | ||
c8e5b163 | 1620 | if (reader_tasks) { |
a241ec65 | 1621 | for (i = 0; i < nrealreaders; i++) { |
c8e5b163 | 1622 | if (reader_tasks[i]) { |
a241ec65 PM |
1623 | VERBOSE_PRINTK_STRING( |
1624 | "Stopping rcu_torture_reader task"); | |
1625 | kthread_stop(reader_tasks[i]); | |
1626 | } | |
1627 | reader_tasks[i] = NULL; | |
1628 | } | |
1629 | kfree(reader_tasks); | |
1630 | reader_tasks = NULL; | |
1631 | } | |
1632 | rcu_torture_current = NULL; | |
1633 | ||
c8e5b163 | 1634 | if (fakewriter_tasks) { |
b772e1dd | 1635 | for (i = 0; i < nfakewriters; i++) { |
c8e5b163 | 1636 | if (fakewriter_tasks[i]) { |
b772e1dd JT |
1637 | VERBOSE_PRINTK_STRING( |
1638 | "Stopping rcu_torture_fakewriter task"); | |
1639 | kthread_stop(fakewriter_tasks[i]); | |
1640 | } | |
1641 | fakewriter_tasks[i] = NULL; | |
1642 | } | |
1643 | kfree(fakewriter_tasks); | |
1644 | fakewriter_tasks = NULL; | |
1645 | } | |
1646 | ||
c8e5b163 | 1647 | if (stats_task) { |
a241ec65 PM |
1648 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); |
1649 | kthread_stop(stats_task); | |
1650 | } | |
1651 | stats_task = NULL; | |
1652 | ||
bf66f18e PM |
1653 | if (fqs_task) { |
1654 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_fqs task"); | |
1655 | kthread_stop(fqs_task); | |
1656 | } | |
1657 | fqs_task = NULL; | |
8e8be45e PM |
1658 | if ((test_boost == 1 && cur_ops->can_boost) || |
1659 | test_boost == 2) { | |
1660 | unregister_cpu_notifier(&rcutorture_cpu_nb); | |
1661 | for_each_possible_cpu(i) | |
1662 | rcutorture_booster_cleanup(i); | |
1663 | } | |
d5f546d8 PM |
1664 | if (shutdown_task != NULL) { |
1665 | VERBOSE_PRINTK_STRING("Stopping rcu_torture_shutdown task"); | |
1666 | kthread_stop(shutdown_task); | |
1667 | } | |
b58bdcca | 1668 | rcu_torture_onoff_cleanup(); |
bf66f18e | 1669 | |
a241ec65 | 1670 | /* Wait for all RCU callbacks to fire. */ |
2326974d PM |
1671 | |
1672 | if (cur_ops->cb_barrier != NULL) | |
1673 | cur_ops->cb_barrier(); | |
a241ec65 | 1674 | |
a241ec65 | 1675 | rcu_torture_stats_print(); /* -After- the stats thread is stopped! */ |
72e9bb54 | 1676 | |
c8e5b163 | 1677 | if (cur_ops->cleanup) |
72e9bb54 | 1678 | cur_ops->cleanup(); |
95c38322 | 1679 | if (atomic_read(&n_rcu_torture_error)) |
8e8be45e | 1680 | rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); |
091541bb PM |
1681 | else if (n_online_successes != n_online_attempts || |
1682 | n_offline_successes != n_offline_attempts) | |
1683 | rcu_torture_print_module_parms(cur_ops, | |
1684 | "End of test: RCU_HOTPLUG"); | |
95c38322 | 1685 | else |
8e8be45e | 1686 | rcu_torture_print_module_parms(cur_ops, "End of test: SUCCESS"); |
a241ec65 PM |
1687 | } |
1688 | ||
6f8bc500 | 1689 | static int __init |
a241ec65 PM |
1690 | rcu_torture_init(void) |
1691 | { | |
1692 | int i; | |
1693 | int cpu; | |
1694 | int firsterr = 0; | |
ade5fb81 | 1695 | static struct rcu_torture_ops *torture_ops[] = |
d9a3da06 | 1696 | { &rcu_ops, &rcu_sync_ops, &rcu_expedited_ops, |
bdf2a436 | 1697 | &rcu_bh_ops, &rcu_bh_sync_ops, &rcu_bh_expedited_ops, |
101db7b4 | 1698 | &srcu_ops, &srcu_raw_ops, &srcu_expedited_ops, |
804bb837 | 1699 | &sched_ops, &sched_sync_ops, &sched_expedited_ops, }; |
a241ec65 | 1700 | |
343e9099 PM |
1701 | mutex_lock(&fullstop_mutex); |
1702 | ||
a241ec65 | 1703 | /* Process args and tell the world that the torturer is on the job. */ |
ade5fb81 | 1704 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { |
72e9bb54 | 1705 | cur_ops = torture_ops[i]; |
ade5fb81 | 1706 | if (strcmp(torture_type, cur_ops->name) == 0) |
72e9bb54 | 1707 | break; |
72e9bb54 | 1708 | } |
ade5fb81 | 1709 | if (i == ARRAY_SIZE(torture_ops)) { |
cf886c44 | 1710 | printk(KERN_ALERT "rcu-torture: invalid torture type: \"%s\"\n", |
72e9bb54 | 1711 | torture_type); |
cf886c44 PM |
1712 | printk(KERN_ALERT "rcu-torture types:"); |
1713 | for (i = 0; i < ARRAY_SIZE(torture_ops); i++) | |
1714 | printk(KERN_ALERT " %s", torture_ops[i]->name); | |
1715 | printk(KERN_ALERT "\n"); | |
343e9099 | 1716 | mutex_unlock(&fullstop_mutex); |
a71fca58 | 1717 | return -EINVAL; |
72e9bb54 | 1718 | } |
bf66f18e PM |
1719 | if (cur_ops->fqs == NULL && fqs_duration != 0) { |
1720 | printk(KERN_ALERT "rcu-torture: ->fqs NULL and non-zero " | |
1721 | "fqs_duration, fqs disabled.\n"); | |
1722 | fqs_duration = 0; | |
1723 | } | |
c8e5b163 | 1724 | if (cur_ops->init) |
72e9bb54 PM |
1725 | cur_ops->init(); /* no "goto unwind" prior to this point!!! */ |
1726 | ||
a241ec65 PM |
1727 | if (nreaders >= 0) |
1728 | nrealreaders = nreaders; | |
1729 | else | |
1730 | nrealreaders = 2 * num_online_cpus(); | |
8e8be45e | 1731 | rcu_torture_print_module_parms(cur_ops, "Start of test"); |
c9d557c1 | 1732 | fullstop = FULLSTOP_DONTSTOP; |
a241ec65 PM |
1733 | |
1734 | /* Set up the freelist. */ | |
1735 | ||
1736 | INIT_LIST_HEAD(&rcu_torture_freelist); | |
788e770e | 1737 | for (i = 0; i < ARRAY_SIZE(rcu_tortures); i++) { |
996417d2 | 1738 | rcu_tortures[i].rtort_mbtest = 0; |
a241ec65 PM |
1739 | list_add_tail(&rcu_tortures[i].rtort_free, |
1740 | &rcu_torture_freelist); | |
1741 | } | |
1742 | ||
1743 | /* Initialize the statistics so that each run gets its own numbers. */ | |
1744 | ||
1745 | rcu_torture_current = NULL; | |
1746 | rcu_torture_current_version = 0; | |
1747 | atomic_set(&n_rcu_torture_alloc, 0); | |
1748 | atomic_set(&n_rcu_torture_alloc_fail, 0); | |
1749 | atomic_set(&n_rcu_torture_free, 0); | |
996417d2 PM |
1750 | atomic_set(&n_rcu_torture_mberror, 0); |
1751 | atomic_set(&n_rcu_torture_error, 0); | |
8e8be45e PM |
1752 | n_rcu_torture_boost_ktrerror = 0; |
1753 | n_rcu_torture_boost_rterror = 0; | |
8e8be45e PM |
1754 | n_rcu_torture_boost_failure = 0; |
1755 | n_rcu_torture_boosts = 0; | |
a241ec65 PM |
1756 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) |
1757 | atomic_set(&rcu_torture_wcount[i], 0); | |
0a945022 | 1758 | for_each_possible_cpu(cpu) { |
a241ec65 PM |
1759 | for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) { |
1760 | per_cpu(rcu_torture_count, cpu)[i] = 0; | |
1761 | per_cpu(rcu_torture_batch, cpu)[i] = 0; | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | /* Start up the kthreads. */ | |
1766 | ||
1767 | VERBOSE_PRINTK_STRING("Creating rcu_torture_writer task"); | |
1768 | writer_task = kthread_run(rcu_torture_writer, NULL, | |
1769 | "rcu_torture_writer"); | |
1770 | if (IS_ERR(writer_task)) { | |
1771 | firsterr = PTR_ERR(writer_task); | |
1772 | VERBOSE_PRINTK_ERRSTRING("Failed to create writer"); | |
1773 | writer_task = NULL; | |
1774 | goto unwind; | |
1775 | } | |
b772e1dd | 1776 | fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), |
a71fca58 | 1777 | GFP_KERNEL); |
b772e1dd JT |
1778 | if (fakewriter_tasks == NULL) { |
1779 | VERBOSE_PRINTK_ERRSTRING("out of memory"); | |
1780 | firsterr = -ENOMEM; | |
1781 | goto unwind; | |
1782 | } | |
1783 | for (i = 0; i < nfakewriters; i++) { | |
1784 | VERBOSE_PRINTK_STRING("Creating rcu_torture_fakewriter task"); | |
1785 | fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, | |
a71fca58 | 1786 | "rcu_torture_fakewriter"); |
b772e1dd JT |
1787 | if (IS_ERR(fakewriter_tasks[i])) { |
1788 | firsterr = PTR_ERR(fakewriter_tasks[i]); | |
1789 | VERBOSE_PRINTK_ERRSTRING("Failed to create fakewriter"); | |
1790 | fakewriter_tasks[i] = NULL; | |
1791 | goto unwind; | |
1792 | } | |
1793 | } | |
2860aaba | 1794 | reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), |
a241ec65 PM |
1795 | GFP_KERNEL); |
1796 | if (reader_tasks == NULL) { | |
1797 | VERBOSE_PRINTK_ERRSTRING("out of memory"); | |
1798 | firsterr = -ENOMEM; | |
1799 | goto unwind; | |
1800 | } | |
1801 | for (i = 0; i < nrealreaders; i++) { | |
1802 | VERBOSE_PRINTK_STRING("Creating rcu_torture_reader task"); | |
1803 | reader_tasks[i] = kthread_run(rcu_torture_reader, NULL, | |
1804 | "rcu_torture_reader"); | |
1805 | if (IS_ERR(reader_tasks[i])) { | |
1806 | firsterr = PTR_ERR(reader_tasks[i]); | |
1807 | VERBOSE_PRINTK_ERRSTRING("Failed to create reader"); | |
1808 | reader_tasks[i] = NULL; | |
1809 | goto unwind; | |
1810 | } | |
1811 | } | |
1812 | if (stat_interval > 0) { | |
1813 | VERBOSE_PRINTK_STRING("Creating rcu_torture_stats task"); | |
1814 | stats_task = kthread_run(rcu_torture_stats, NULL, | |
1815 | "rcu_torture_stats"); | |
1816 | if (IS_ERR(stats_task)) { | |
1817 | firsterr = PTR_ERR(stats_task); | |
1818 | VERBOSE_PRINTK_ERRSTRING("Failed to create stats"); | |
1819 | stats_task = NULL; | |
1820 | goto unwind; | |
1821 | } | |
1822 | } | |
d84f5203 SV |
1823 | if (test_no_idle_hz) { |
1824 | rcu_idle_cpu = num_online_cpus() - 1; | |
73d0a4b1 RR |
1825 | |
1826 | if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) { | |
1827 | firsterr = -ENOMEM; | |
1828 | VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask"); | |
1829 | goto unwind; | |
1830 | } | |
1831 | ||
d84f5203 SV |
1832 | /* Create the shuffler thread */ |
1833 | shuffler_task = kthread_run(rcu_torture_shuffle, NULL, | |
1834 | "rcu_torture_shuffle"); | |
1835 | if (IS_ERR(shuffler_task)) { | |
73d0a4b1 | 1836 | free_cpumask_var(shuffle_tmp_mask); |
d84f5203 SV |
1837 | firsterr = PTR_ERR(shuffler_task); |
1838 | VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler"); | |
1839 | shuffler_task = NULL; | |
1840 | goto unwind; | |
1841 | } | |
1842 | } | |
d120f65f PM |
1843 | if (stutter < 0) |
1844 | stutter = 0; | |
1845 | if (stutter) { | |
1846 | /* Create the stutter thread */ | |
1847 | stutter_task = kthread_run(rcu_torture_stutter, NULL, | |
1848 | "rcu_torture_stutter"); | |
1849 | if (IS_ERR(stutter_task)) { | |
1850 | firsterr = PTR_ERR(stutter_task); | |
1851 | VERBOSE_PRINTK_ERRSTRING("Failed to create stutter"); | |
1852 | stutter_task = NULL; | |
1853 | goto unwind; | |
1854 | } | |
1855 | } | |
bf66f18e PM |
1856 | if (fqs_duration < 0) |
1857 | fqs_duration = 0; | |
1858 | if (fqs_duration) { | |
1859 | /* Create the stutter thread */ | |
1860 | fqs_task = kthread_run(rcu_torture_fqs, NULL, | |
1861 | "rcu_torture_fqs"); | |
1862 | if (IS_ERR(fqs_task)) { | |
1863 | firsterr = PTR_ERR(fqs_task); | |
1864 | VERBOSE_PRINTK_ERRSTRING("Failed to create fqs"); | |
1865 | fqs_task = NULL; | |
1866 | goto unwind; | |
1867 | } | |
1868 | } | |
8e8be45e PM |
1869 | if (test_boost_interval < 1) |
1870 | test_boost_interval = 1; | |
1871 | if (test_boost_duration < 2) | |
1872 | test_boost_duration = 2; | |
1873 | if ((test_boost == 1 && cur_ops->can_boost) || | |
1874 | test_boost == 2) { | |
1875 | int retval; | |
1876 | ||
1877 | boost_starttime = jiffies + test_boost_interval * HZ; | |
1878 | register_cpu_notifier(&rcutorture_cpu_nb); | |
1879 | for_each_possible_cpu(i) { | |
1880 | if (cpu_is_offline(i)) | |
1881 | continue; /* Heuristic: CPU can go offline. */ | |
1882 | retval = rcutorture_booster_init(i); | |
1883 | if (retval < 0) { | |
1884 | firsterr = retval; | |
1885 | goto unwind; | |
1886 | } | |
1887 | } | |
1888 | } | |
d5f546d8 PM |
1889 | if (shutdown_secs > 0) { |
1890 | shutdown_time = jiffies + shutdown_secs * HZ; | |
1891 | shutdown_task = kthread_run(rcu_torture_shutdown, NULL, | |
1892 | "rcu_torture_shutdown"); | |
1893 | if (IS_ERR(shutdown_task)) { | |
1894 | firsterr = PTR_ERR(shutdown_task); | |
1895 | VERBOSE_PRINTK_ERRSTRING("Failed to create shutdown"); | |
1896 | shutdown_task = NULL; | |
1897 | goto unwind; | |
1898 | } | |
1899 | } | |
b58bdcca | 1900 | rcu_torture_onoff_init(); |
8e8be45e | 1901 | register_reboot_notifier(&rcutorture_shutdown_nb); |
c13f3757 | 1902 | rcu_torture_stall_init(); |
4a298656 | 1903 | rcutorture_record_test_transition(); |
343e9099 | 1904 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
1905 | return 0; |
1906 | ||
1907 | unwind: | |
343e9099 | 1908 | mutex_unlock(&fullstop_mutex); |
a241ec65 PM |
1909 | rcu_torture_cleanup(); |
1910 | return firsterr; | |
1911 | } | |
1912 | ||
1913 | module_init(rcu_torture_init); | |
1914 | module_exit(rcu_torture_cleanup); |