f0a36bb1 |
1 | /* test-fair-rwlock.c |
2 | * |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/proc_fs.h> |
7 | #include <linux/sched.h> |
8 | #include <linux/timex.h> |
9 | #include <linux/fair-rwlock.h> |
10 | #include <linux/kthread.h> |
11 | #include <linux/delay.h> |
12 | #include <linux/hardirq.h> |
13 | #include <linux/module.h> |
7f563886 |
14 | #include <linux/percpu.h> |
cd7cf33d |
15 | #include <linux/spinlock.h> |
f0a36bb1 |
16 | #include <asm/ptrace.h> |
17 | |
7f563886 |
18 | #if (NR_CPUS > 64 && (BITS_PER_LONG == 32 || NR_CPUS > 32768)) |
f0a36bb1 |
19 | #error "fair rwlock needs more bits per long to deal with that many CPUs" |
20 | #endif |
21 | |
68f25f81 |
22 | /* Test with no contention duration, in seconds */ |
23 | #define SINGLE_WRITER_TEST_DURATION 10 |
24 | #define SINGLE_READER_TEST_DURATION 10 |
25 | #define MULTIPLE_READERS_TEST_DURATION 10 |
26 | |
89889f86 |
27 | /* Test duration, in seconds */ |
f36c4112 |
28 | #define TEST_DURATION 60 |
89889f86 |
29 | |
f0a36bb1 |
30 | #define NR_VARS 100 |
cd7cf33d |
31 | //#define NR_WRITERS 2 |
1c21e42c |
32 | #define NR_WRITERS 2 |
cd7cf33d |
33 | //#define NR_TRYLOCK_WRITERS 2 |
34 | #define NR_TRYLOCK_WRITERS 0 |
1c21e42c |
35 | #define NR_READERS 4 |
cd7cf33d |
36 | //#define NR_TRYLOCK_READERS 2 |
37 | #define NR_TRYLOCK_READERS 0 |
38 | |
39 | /* |
40 | * 1 : test standard rwlock |
41 | * 0 : test frwlock |
42 | */ |
43 | #define TEST_STD_RWLOCK 0 |
4fd25765 |
44 | |
45 | /* |
46 | * 1 : test with thread and interrupt readers. |
47 | * 0 : test only with thread readers. |
48 | */ |
49 | #define TEST_INTERRUPTS 1 |
50 | |
51 | #if (TEST_INTERRUPTS) |
1c21e42c |
52 | #define NR_INTERRUPT_READERS 1 |
53 | #define NR_TRYLOCK_INTERRUPT_READERS 1 |
4fd25765 |
54 | #else |
55 | #define NR_INTERRUPT_READERS 0 |
56 | #define NR_TRYLOCK_INTERRUPT_READERS 0 |
57 | #endif |
f0a36bb1 |
58 | |
4d1751f9 |
59 | /* |
60 | * Writer iteration delay, in us. 0 for busy loop. Caution : writers can |
61 | * starve readers. |
62 | */ |
cd7cf33d |
63 | #define WRITER_DELAY 100 |
4fd25765 |
64 | #define TRYLOCK_WRITER_DELAY 1000 |
65 | |
66 | /* |
67 | * Number of iterations after which a trylock writer fails. |
68 | * -1 for infinite loop. |
69 | */ |
70 | #define TRYLOCK_WRITERS_FAIL_ITER 100 |
71 | |
72 | /* Thread and interrupt reader delay, in ms */ |
73 | #define THREAD_READER_DELAY 0 /* busy loop */ |
74 | #define INTERRUPT_READER_DELAY 100 |
89889f86 |
75 | |
f0a36bb1 |
76 | static int var[NR_VARS]; |
77 | static struct task_struct *reader_threads[NR_READERS]; |
1c21e42c |
78 | static struct task_struct *trylock_reader_threads[NR_TRYLOCK_READERS]; |
f0a36bb1 |
79 | static struct task_struct *writer_threads[NR_WRITERS]; |
1c21e42c |
80 | static struct task_struct *trylock_writer_threads[NR_TRYLOCK_WRITERS]; |
4fd25765 |
81 | static struct task_struct *interrupt_reader[NR_INTERRUPT_READERS]; |
82 | static struct task_struct *trylock_interrupt_reader[NR_TRYLOCK_INTERRUPT_READERS]; |
f0a36bb1 |
83 | |
cd7cf33d |
84 | #if (TEST_STD_RWLOCK) |
85 | |
86 | static DEFINE_RWLOCK(std_rw_lock); |
87 | |
88 | #define wrap_read_lock() read_lock(&std_rw_lock) |
89 | #define wrap_read_trylock() read_trylock(&std_rw_lock) |
90 | #define wrap_read_unlock() read_unlock(&std_rw_lock) |
91 | |
92 | #define wrap_read_lock_irq() read_lock(&std_rw_lock) |
93 | #define wrap_read_trylock_irq() read_trylock(&std_rw_lock) |
94 | #define wrap_read_unlock_irq() read_unlock(&std_rw_lock) |
95 | |
96 | #if (TEST_INTERRUPTS) |
97 | #define wrap_write_lock() write_lock_irq(&std_rw_lock) |
98 | #define wrap_write_unlock() write_unlock_irq(&std_rw_lock) |
99 | #else |
100 | #define wrap_write_lock() write_lock(&std_rw_lock) |
101 | #define wrap_write_unlock() write_unlock(&std_rw_lock) |
102 | #endif |
103 | |
104 | #else |
105 | |
f0a36bb1 |
106 | static struct fair_rwlock frwlock = { |
107 | .value = ATOMIC_LONG_INIT(0), |
f0a36bb1 |
108 | }; |
109 | |
cd7cf33d |
110 | #define wrap_read_lock() fair_read_lock(&frwlock) |
111 | #define wrap_read_trylock() fair_read_trylock(&frwlock) |
112 | #define wrap_read_unlock() fair_read_unlock(&frwlock) |
113 | |
114 | #define wrap_read_lock_irq() fair_read_lock_irq(&frwlock) |
115 | #define wrap_read_trylock_irq() fair_read_trylock_irq(&frwlock) |
116 | #define wrap_read_unlock_irq() fair_read_unlock_irq(&frwlock) |
117 | |
118 | #if (TEST_INTERRUPTS) |
119 | #define wrap_write_lock() fair_write_lock_irq(&frwlock) |
120 | #define wrap_write_unlock() fair_write_unlock_irq(&frwlock) |
121 | #else |
122 | #define wrap_write_lock() fair_write_lock(&frwlock) |
123 | #define wrap_write_unlock() fair_write_unlock(&frwlock) |
124 | #endif |
125 | |
126 | #endif |
127 | |
68f25f81 |
128 | static cycles_t cycles_calibration_min, |
129 | cycles_calibration_avg, |
130 | cycles_calibration_max; |
131 | |
132 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
133 | { |
134 | return cycles - cycles_calibration_avg; |
135 | } |
136 | |
f0a36bb1 |
137 | struct proc_dir_entry *pentry = NULL; |
138 | |
139 | static int reader_thread(void *data) |
140 | { |
141 | int i; |
142 | int prev, cur; |
143 | unsigned long iter = 0; |
68f25f81 |
144 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
145 | delayavg = 0; |
f0a36bb1 |
146 | |
147 | printk("reader_thread/%lu runnning\n", (unsigned long)data); |
148 | do { |
149 | iter++; |
7f563886 |
150 | preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
151 | rdtsc_barrier(); |
7f563886 |
152 | time1 = get_cycles(); |
68f25f81 |
153 | rdtsc_barrier(); |
154 | |
cd7cf33d |
155 | wrap_read_lock(); |
68f25f81 |
156 | |
157 | rdtsc_barrier(); |
7f563886 |
158 | time2 = get_cycles(); |
68f25f81 |
159 | rdtsc_barrier(); |
160 | delay = time2 - time1; |
161 | delaymax = max(delaymax, delay); |
162 | delaymin = min(delaymin, delay); |
163 | delayavg += delay; |
f0a36bb1 |
164 | prev = var[0]; |
165 | for (i = 1; i < NR_VARS; i++) { |
166 | cur = var[i]; |
167 | if (cur != prev) |
168 | printk(KERN_ALERT |
169 | "Unequal cur %d/prev %d at i %d, iter %lu " |
170 | "in thread\n", cur, prev, i, iter); |
171 | } |
cd7cf33d |
172 | |
173 | wrap_read_unlock(); |
174 | |
7f563886 |
175 | preempt_enable(); /* for get_cycles accuracy */ |
4fd25765 |
176 | if (THREAD_READER_DELAY) |
177 | msleep(THREAD_READER_DELAY); |
f0a36bb1 |
178 | } while (!kthread_should_stop()); |
4fd25765 |
179 | if (!iter) { |
180 | printk("reader_thread/%lu iterations : %lu", |
181 | (unsigned long)data, iter); |
182 | } else { |
183 | delayavg /= iter; |
184 | printk("reader_thread/%lu iterations : %lu, " |
185 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
186 | (unsigned long)data, iter, |
187 | calibrate_cycles(delaymin), |
188 | calibrate_cycles(delayavg), |
189 | calibrate_cycles(delaymax)); |
190 | } |
f0a36bb1 |
191 | return 0; |
192 | } |
193 | |
1c21e42c |
194 | static int trylock_reader_thread(void *data) |
195 | { |
196 | int i; |
197 | int prev, cur; |
198 | unsigned long iter = 0, success_iter = 0; |
199 | |
200 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
201 | do { |
cd7cf33d |
202 | while (!wrap_read_trylock()) |
1c21e42c |
203 | iter++; |
204 | success_iter++; |
205 | prev = var[0]; |
206 | for (i = 1; i < NR_VARS; i++) { |
207 | cur = var[i]; |
208 | if (cur != prev) |
209 | printk(KERN_ALERT |
210 | "Unequal cur %d/prev %d at i %d, iter %lu " |
211 | "in thread\n", cur, prev, i, iter); |
212 | } |
cd7cf33d |
213 | wrap_read_unlock(); |
4fd25765 |
214 | if (THREAD_READER_DELAY) |
215 | msleep(THREAD_READER_DELAY); |
1c21e42c |
216 | } while (!kthread_should_stop()); |
217 | printk("trylock_reader_thread/%lu iterations : %lu, " |
218 | "successful iterations : %lu\n", |
219 | (unsigned long)data, iter, success_iter); |
220 | return 0; |
221 | } |
222 | |
68f25f81 |
223 | DEFINE_PER_CPU(cycles_t, int_delaymin); |
224 | DEFINE_PER_CPU(cycles_t, int_delayavg); |
7f563886 |
225 | DEFINE_PER_CPU(cycles_t, int_delaymax); |
68f25f81 |
226 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
227 | |
f0a36bb1 |
228 | static void interrupt_reader_ipi(void *data) |
229 | { |
230 | int i; |
231 | int prev, cur; |
7f563886 |
232 | cycles_t time1, time2; |
68f25f81 |
233 | cycles_t *delaymax, *delaymin, *delayavg, *ipi_nr, delay; |
7f563886 |
234 | |
235 | /* |
236 | * Skip the ipi caller, not in irq context. |
237 | */ |
238 | if (!in_irq()) |
239 | return; |
f0a36bb1 |
240 | |
7f563886 |
241 | delaymax = &per_cpu(int_delaymax, smp_processor_id()); |
68f25f81 |
242 | delaymin = &per_cpu(int_delaymin, smp_processor_id()); |
243 | delayavg = &per_cpu(int_delayavg, smp_processor_id()); |
244 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
245 | |
246 | rdtsc_barrier(); |
7f563886 |
247 | time1 = get_cycles(); |
68f25f81 |
248 | rdtsc_barrier(); |
249 | |
cd7cf33d |
250 | wrap_read_lock_irq(); |
68f25f81 |
251 | |
252 | rdtsc_barrier(); |
7f563886 |
253 | time2 = get_cycles(); |
68f25f81 |
254 | rdtsc_barrier(); |
255 | delay = time2 - time1; |
256 | *delaymax = max(*delaymax, delay); |
257 | *delaymin = min(*delaymin, delay); |
258 | *delayavg += delay; |
259 | (*ipi_nr)++; |
f0a36bb1 |
260 | prev = var[0]; |
261 | for (i = 1; i < NR_VARS; i++) { |
262 | cur = var[i]; |
263 | if (cur != prev) |
264 | printk(KERN_ALERT |
265 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
266 | cur, prev, i); |
267 | } |
cd7cf33d |
268 | wrap_read_unlock_irq(); |
f0a36bb1 |
269 | } |
270 | |
1c21e42c |
271 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
272 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
273 | |
274 | static void trylock_interrupt_reader_ipi(void *data) |
275 | { |
276 | int i; |
277 | int prev, cur; |
278 | |
279 | /* |
280 | * Skip the ipi caller, not in irq context. |
281 | */ |
282 | if (!in_irq()) |
283 | return; |
284 | |
285 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
286 | while (!wrap_read_trylock_irq()) |
1c21e42c |
287 | per_cpu(trylock_int_iter, smp_processor_id())++; |
288 | per_cpu(trylock_int_success, smp_processor_id())++; |
289 | prev = var[0]; |
290 | for (i = 1; i < NR_VARS; i++) { |
291 | cur = var[i]; |
292 | if (cur != prev) |
293 | printk(KERN_ALERT |
294 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
295 | cur, prev, i); |
296 | } |
cd7cf33d |
297 | wrap_read_unlock_irq(); |
1c21e42c |
298 | } |
299 | |
300 | |
f0a36bb1 |
301 | static int interrupt_reader_thread(void *data) |
302 | { |
303 | unsigned long iter = 0; |
7f563886 |
304 | int i; |
305 | |
68f25f81 |
306 | for_each_online_cpu(i) { |
307 | per_cpu(int_delaymax, i) = 0; |
308 | per_cpu(int_delaymin, i) = ULLONG_MAX; |
309 | per_cpu(int_delayavg, i) = 0; |
310 | per_cpu(int_ipi_nr, i) = 0; |
311 | } |
f0a36bb1 |
312 | do { |
313 | iter++; |
314 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
315 | if (INTERRUPT_READER_DELAY) |
316 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
317 | } while (!kthread_should_stop()); |
318 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
319 | (unsigned long)data, iter); |
7f563886 |
320 | for_each_online_cpu(i) { |
4fd25765 |
321 | if (!per_cpu(int_ipi_nr, i)) |
322 | continue; |
68f25f81 |
323 | per_cpu(int_delayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
324 | printk("interrupt readers on CPU %i, " |
68f25f81 |
325 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
326 | i, |
327 | calibrate_cycles(per_cpu(int_delaymin, i)), |
328 | calibrate_cycles(per_cpu(int_delayavg, i)), |
329 | calibrate_cycles(per_cpu(int_delaymax, i))); |
7f563886 |
330 | } |
f0a36bb1 |
331 | return 0; |
332 | } |
333 | |
1c21e42c |
334 | static int trylock_interrupt_reader_thread(void *data) |
335 | { |
336 | unsigned long iter = 0; |
337 | int i; |
338 | |
339 | do { |
340 | iter++; |
341 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
342 | if (INTERRUPT_READER_DELAY) |
343 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
344 | } while (!kthread_should_stop()); |
345 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
346 | (unsigned long)data, iter); |
347 | for_each_online_cpu(i) { |
348 | printk("trylock interrupt readers on CPU %i, " |
349 | "iterations %lu, " |
350 | "successful iterations : %lu\n", |
351 | i, per_cpu(trylock_int_iter, i), |
352 | per_cpu(trylock_int_success, i)); |
68f25f81 |
353 | per_cpu(trylock_int_iter, i) = 0; |
354 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
355 | } |
356 | return 0; |
357 | } |
358 | |
f0a36bb1 |
359 | static int writer_thread(void *data) |
360 | { |
361 | int i; |
362 | int new; |
363 | unsigned long iter = 0; |
68f25f81 |
364 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
365 | delayavg = 0; |
f0a36bb1 |
366 | |
367 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
368 | do { |
369 | iter++; |
7f563886 |
370 | preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
371 | rdtsc_barrier(); |
7f563886 |
372 | time1 = get_cycles(); |
68f25f81 |
373 | rdtsc_barrier(); |
374 | |
cd7cf33d |
375 | wrap_write_lock(); |
68f25f81 |
376 | |
377 | rdtsc_barrier(); |
7f563886 |
378 | time2 = get_cycles(); |
68f25f81 |
379 | rdtsc_barrier(); |
380 | delay = time2 - time1; |
381 | delaymax = max(delaymax, delay); |
382 | delaymin = min(delaymin, delay); |
383 | delayavg += delay; |
f0a36bb1 |
384 | new = (int)get_cycles(); |
385 | for (i = 0; i < NR_VARS; i++) { |
386 | var[i] = new; |
387 | } |
cd7cf33d |
388 | |
389 | wrap_write_unlock(); |
390 | |
7f563886 |
391 | preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
392 | if (WRITER_DELAY > 0) |
4d1751f9 |
393 | udelay(WRITER_DELAY); |
f0a36bb1 |
394 | } while (!kthread_should_stop()); |
68f25f81 |
395 | delayavg /= iter; |
7f563886 |
396 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
397 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
398 | (unsigned long)data, iter, |
399 | calibrate_cycles(delaymin), |
400 | calibrate_cycles(delayavg), |
401 | calibrate_cycles(delaymax)); |
f0a36bb1 |
402 | return 0; |
403 | } |
404 | |
cd7cf33d |
405 | #if (TEST_STD_RWLOCK) |
406 | static int trylock_writer_thread(void *data) |
407 | { |
408 | int i; |
409 | int new; |
410 | unsigned long iter = 0, success = 0, fail = 0; |
411 | |
412 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
413 | do { |
414 | #if (TEST_INTERRUPTS) |
415 | /* std write trylock cannot disable interrupts. */ |
416 | local_irq_disable(); |
417 | #endif |
418 | |
419 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
420 | for (;;) { |
421 | iter++; |
422 | if (write_trylock(&std_rw_lock)) |
423 | goto locked; |
424 | } |
425 | #else |
426 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
427 | iter++; |
428 | if (write_trylock(&std_rw_lock)) |
429 | goto locked; |
430 | } |
431 | #endif |
432 | fail++; |
433 | #if (TEST_INTERRUPTS) |
434 | local_irq_enable(); |
435 | #endif |
436 | goto loop; |
437 | locked: |
438 | success++; |
439 | new = (int)get_cycles(); |
440 | for (i = 0; i < NR_VARS; i++) { |
441 | var[i] = new; |
442 | } |
443 | #if (TEST_INTERRUPTS) |
444 | write_unlock_irq(&std_rw_lock); |
445 | #else |
446 | write_unlock(&std_rw_lock); |
447 | #endif |
448 | loop: |
449 | if (TRYLOCK_WRITER_DELAY > 0) |
450 | udelay(TRYLOCK_WRITER_DELAY); |
451 | } while (!kthread_should_stop()); |
452 | printk("trylock_writer_thread/%lu iterations : " |
453 | "[try,success,fail after %d try], " |
454 | "%lu,%lu,%lu\n", |
455 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
456 | iter, success, fail); |
457 | return 0; |
458 | } |
459 | |
460 | #else /* !TEST_STD_RWLOCK */ |
461 | |
1c21e42c |
462 | static int trylock_writer_thread(void *data) |
463 | { |
464 | int i; |
465 | int new; |
4fd25765 |
466 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
467 | |
468 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
469 | do { |
4fd25765 |
470 | iter++; |
471 | #if (TEST_INTERRUPTS) |
472 | if (fair_write_trylock_irq_else_subscribe(&frwlock)) |
473 | #else |
474 | if (fair_write_trylock_else_subscribe(&frwlock)) |
475 | #endif |
476 | goto locked; |
cd7cf33d |
477 | |
4fd25765 |
478 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
479 | for (;;) { |
1c21e42c |
480 | iter++; |
4fd25765 |
481 | #if (TEST_INTERRUPTS) |
482 | if (fair_write_trylock_irq_subscribed(&frwlock)) |
483 | #else |
484 | if (fair_write_trylock_subscribed(&frwlock)) |
485 | #endif |
486 | goto locked; |
1c21e42c |
487 | } |
4fd25765 |
488 | #else |
cd7cf33d |
489 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
490 | iter++; |
491 | #if (TEST_INTERRUPTS) |
492 | if (fair_write_trylock_irq_subscribed(&frwlock)) |
493 | #else |
494 | if (fair_write_trylock_subscribed(&frwlock)) |
495 | #endif |
496 | goto locked; |
497 | } |
498 | #endif |
499 | fail++; |
500 | fair_write_unsubscribe(&frwlock); |
501 | goto loop; |
502 | locked: |
1c21e42c |
503 | success++; |
1c21e42c |
504 | new = (int)get_cycles(); |
505 | for (i = 0; i < NR_VARS; i++) { |
506 | var[i] = new; |
507 | } |
4fd25765 |
508 | #if (TEST_INTERRUPTS) |
1c21e42c |
509 | fair_write_unlock_irq(&frwlock); |
4fd25765 |
510 | #else |
511 | fair_write_unlock(&frwlock); |
512 | #endif |
513 | loop: |
514 | if (TRYLOCK_WRITER_DELAY > 0) |
515 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
516 | } while (!kthread_should_stop()); |
4fd25765 |
517 | printk("trylock_writer_thread/%lu iterations : " |
518 | "[try,success,fail after %d try], " |
519 | "%lu,%lu,%lu\n", |
520 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
521 | iter, success, fail); |
1c21e42c |
522 | return 0; |
523 | } |
524 | |
cd7cf33d |
525 | #endif /* TEST_STD_RWLOCK */ |
526 | |
f0a36bb1 |
527 | static void fair_rwlock_create(void) |
528 | { |
529 | unsigned long i; |
530 | |
531 | for (i = 0; i < NR_READERS; i++) { |
532 | printk("starting reader thread %lu\n", i); |
533 | reader_threads[i] = kthread_run(reader_thread, (void *)i, |
534 | "frwlock_reader"); |
535 | BUG_ON(!reader_threads[i]); |
536 | } |
537 | |
1c21e42c |
538 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
539 | printk("starting trylock reader thread %lu\n", i); |
540 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
541 | (void *)i, "frwlock_trylock_reader"); |
542 | BUG_ON(!trylock_reader_threads[i]); |
543 | } |
4fd25765 |
544 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
545 | printk("starting interrupt reader %lu\n", i); |
546 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
547 | (void *)i, |
548 | "frwlock_interrupt_reader"); |
549 | } |
550 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
551 | printk("starting trylock interrupt reader %lu\n", i); |
552 | trylock_interrupt_reader[i] = |
553 | kthread_run(trylock_interrupt_reader_thread, |
554 | (void *)i, "frwlock_trylock_interrupt_reader"); |
555 | } |
f0a36bb1 |
556 | for (i = 0; i < NR_WRITERS; i++) { |
557 | printk("starting writer thread %lu\n", i); |
558 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
559 | "frwlock_writer"); |
560 | BUG_ON(!writer_threads[i]); |
561 | } |
1c21e42c |
562 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
563 | printk("starting trylock writer thread %lu\n", i); |
564 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
565 | (void *)i, "frwlock_trylock_writer"); |
566 | BUG_ON(!trylock_writer_threads[i]); |
567 | } |
f0a36bb1 |
568 | } |
569 | |
570 | static void fair_rwlock_stop(void) |
571 | { |
572 | unsigned long i; |
573 | |
1c21e42c |
574 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
575 | kthread_stop(writer_threads[i]); |
1c21e42c |
576 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
577 | kthread_stop(trylock_writer_threads[i]); |
578 | for (i = 0; i < NR_READERS; i++) |
f0a36bb1 |
579 | kthread_stop(reader_threads[i]); |
1c21e42c |
580 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
581 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
582 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
583 | kthread_stop(interrupt_reader[i]); |
584 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
585 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
586 | } |
587 | |
588 | |
589 | static void perform_test(const char *name, void (*callback)(void)) |
590 | { |
591 | printk("%s\n", name); |
592 | callback(); |
593 | } |
594 | |
595 | static int my_open(struct inode *inode, struct file *file) |
596 | { |
68f25f81 |
597 | unsigned long i; |
598 | cycles_t time1, time2, delay; |
599 | |
600 | printk("** get_cycles calibration **\n"); |
601 | cycles_calibration_min = ULLONG_MAX; |
602 | cycles_calibration_avg = 0; |
603 | cycles_calibration_max = 0; |
604 | |
605 | local_irq_disable(); |
606 | for (i = 0; i < 10; i++) { |
607 | rdtsc_barrier(); |
608 | time1 = get_cycles(); |
609 | rdtsc_barrier(); |
610 | rdtsc_barrier(); |
611 | time2 = get_cycles(); |
612 | rdtsc_barrier(); |
613 | delay = time2 - time1; |
614 | cycles_calibration_min = min(cycles_calibration_min, delay); |
615 | cycles_calibration_avg += delay; |
616 | cycles_calibration_max = max(cycles_calibration_max, delay); |
617 | } |
618 | cycles_calibration_avg /= 10; |
619 | local_irq_enable(); |
620 | |
621 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
622 | "results calibrated on avg\n", |
623 | cycles_calibration_min, |
624 | cycles_calibration_avg, |
625 | cycles_calibration_max); |
626 | |
627 | printk("** Single writer test, no contention **\n"); |
628 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
629 | "frwlock_writer"); |
630 | BUG_ON(!writer_threads[0]); |
631 | ssleep(SINGLE_WRITER_TEST_DURATION); |
632 | kthread_stop(writer_threads[0]); |
633 | |
4fd25765 |
634 | printk("** Single trylock writer test, no contention **\n"); |
635 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
636 | (void *)0, |
637 | "trylock_frwlock_writer"); |
638 | BUG_ON(!trylock_writer_threads[0]); |
639 | ssleep(SINGLE_WRITER_TEST_DURATION); |
640 | kthread_stop(trylock_writer_threads[0]); |
641 | |
68f25f81 |
642 | printk("** Single reader test, no contention **\n"); |
643 | reader_threads[0] = kthread_run(reader_thread, (void *)0, |
644 | "frwlock_reader"); |
645 | BUG_ON(!reader_threads[0]); |
646 | ssleep(SINGLE_READER_TEST_DURATION); |
647 | kthread_stop(reader_threads[0]); |
648 | |
649 | printk("** Multiple readers test, no contention **\n"); |
650 | for (i = 0; i < NR_READERS; i++) { |
651 | printk("starting reader thread %lu\n", i); |
652 | reader_threads[i] = kthread_run(reader_thread, (void *)i, |
653 | "frwlock_reader"); |
654 | BUG_ON(!reader_threads[i]); |
655 | } |
656 | ssleep(SINGLE_READER_TEST_DURATION); |
657 | for (i = 0; i < NR_READERS; i++) |
658 | kthread_stop(reader_threads[i]); |
659 | |
660 | printk("** High contention test **\n"); |
f0a36bb1 |
661 | perform_test("fair-rwlock-create", fair_rwlock_create); |
f36c4112 |
662 | ssleep(TEST_DURATION); |
f0a36bb1 |
663 | perform_test("fair-rwlock-stop", fair_rwlock_stop); |
664 | |
665 | return -EPERM; |
666 | } |
667 | |
668 | |
669 | static struct file_operations my_operations = { |
670 | .open = my_open, |
671 | }; |
672 | |
673 | int init_module(void) |
674 | { |
675 | pentry = create_proc_entry("testfrwlock", 0444, NULL); |
676 | if (pentry) |
677 | pentry->proc_fops = &my_operations; |
678 | |
679 | printk("NR_CPUS : %d\n", NR_CPUS); |
680 | printk("THREAD_ROFFSET : %lX\n", THREAD_ROFFSET); |
681 | printk("THREAD_RMASK : %lX\n", THREAD_RMASK); |
f0a36bb1 |
682 | printk("SOFTIRQ_ROFFSET : %lX\n", SOFTIRQ_ROFFSET); |
683 | printk("SOFTIRQ_RMASK : %lX\n", SOFTIRQ_RMASK); |
f0a36bb1 |
684 | printk("HARDIRQ_ROFFSET : %lX\n", HARDIRQ_ROFFSET); |
685 | printk("HARDIRQ_RMASK : %lX\n", HARDIRQ_RMASK); |
7f563886 |
686 | printk("SUBSCRIBERS_WOFFSET : %lX\n", SUBSCRIBERS_WOFFSET); |
687 | printk("SUBSCRIBERS_WMASK : %lX\n", SUBSCRIBERS_WMASK); |
688 | printk("WRITER_MUTEX : %lX\n", WRITER_MUTEX); |
689 | printk("SOFTIRQ_WMASK : %lX\n", SOFTIRQ_WMASK); |
f0a36bb1 |
690 | printk("HARDIRQ_WMASK : %lX\n", HARDIRQ_WMASK); |
691 | |
692 | return 0; |
693 | } |
694 | |
695 | void cleanup_module(void) |
696 | { |
697 | remove_proc_entry("testfrwlock", NULL); |
698 | } |
699 | |
700 | MODULE_LICENSE("GPL"); |
701 | MODULE_AUTHOR("Mathieu Desnoyers"); |
702 | MODULE_DESCRIPTION("Fair rwlock test"); |