0e0fdeb6 |
1 | /* test-wbias-rwlock.c |
f0a36bb1 |
2 | * |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/proc_fs.h> |
7 | #include <linux/sched.h> |
8 | #include <linux/timex.h> |
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9 | #include <linux/wbias-rwlock.h> |
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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> |
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15 | #include <linux/spinlock.h> |
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16 | #include <asm/ptrace.h> |
17 | |
68f25f81 |
18 | /* Test with no contention duration, in seconds */ |
19 | #define SINGLE_WRITER_TEST_DURATION 10 |
20 | #define SINGLE_READER_TEST_DURATION 10 |
21 | #define MULTIPLE_READERS_TEST_DURATION 10 |
22 | |
89889f86 |
23 | /* Test duration, in seconds */ |
f36c4112 |
24 | #define TEST_DURATION 60 |
89889f86 |
25 | |
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26 | #define NR_VARS 100 |
1c21e42c |
27 | #define NR_WRITERS 2 |
ca935c46 |
28 | #define NR_TRYLOCK_WRITERS 1 |
1f5845d5 |
29 | #define NR_PREADERS 2 |
30 | #define NR_NPREADERS 2 |
ca935c46 |
31 | #define NR_TRYLOCK_READERS 1 |
cd7cf33d |
32 | |
33 | /* |
34 | * 1 : test standard rwlock |
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35 | * 0 : test wbiasrwlock |
cd7cf33d |
36 | */ |
37 | #define TEST_STD_RWLOCK 0 |
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38 | |
39 | /* |
40 | * 1 : test with thread and interrupt readers. |
41 | * 0 : test only with thread readers. |
42 | */ |
43 | #define TEST_INTERRUPTS 1 |
44 | |
45 | #if (TEST_INTERRUPTS) |
1c21e42c |
46 | #define NR_INTERRUPT_READERS 1 |
47 | #define NR_TRYLOCK_INTERRUPT_READERS 1 |
4fd25765 |
48 | #else |
49 | #define NR_INTERRUPT_READERS 0 |
50 | #define NR_TRYLOCK_INTERRUPT_READERS 0 |
51 | #endif |
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52 | |
4d1751f9 |
53 | /* |
54 | * Writer iteration delay, in us. 0 for busy loop. Caution : writers can |
55 | * starve readers. |
56 | */ |
cd7cf33d |
57 | #define WRITER_DELAY 100 |
4fd25765 |
58 | #define TRYLOCK_WRITER_DELAY 1000 |
59 | |
60 | /* |
61 | * Number of iterations after which a trylock writer fails. |
62 | * -1 for infinite loop. |
63 | */ |
64 | #define TRYLOCK_WRITERS_FAIL_ITER 100 |
65 | |
66 | /* Thread and interrupt reader delay, in ms */ |
67 | #define THREAD_READER_DELAY 0 /* busy loop */ |
68 | #define INTERRUPT_READER_DELAY 100 |
89889f86 |
69 | |
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70 | static int var[NR_VARS]; |
1f5845d5 |
71 | static struct task_struct *preader_threads[NR_PREADERS]; |
72 | static struct task_struct *npreader_threads[NR_NPREADERS]; |
1c21e42c |
73 | static struct task_struct *trylock_reader_threads[NR_TRYLOCK_READERS]; |
f0a36bb1 |
74 | static struct task_struct *writer_threads[NR_WRITERS]; |
1c21e42c |
75 | static struct task_struct *trylock_writer_threads[NR_TRYLOCK_WRITERS]; |
4fd25765 |
76 | static struct task_struct *interrupt_reader[NR_INTERRUPT_READERS]; |
77 | static struct task_struct *trylock_interrupt_reader[NR_TRYLOCK_INTERRUPT_READERS]; |
f0a36bb1 |
78 | |
cd7cf33d |
79 | #if (TEST_STD_RWLOCK) |
80 | |
81 | static DEFINE_RWLOCK(std_rw_lock); |
82 | |
83 | #define wrap_read_lock() read_lock(&std_rw_lock) |
84 | #define wrap_read_trylock() read_trylock(&std_rw_lock) |
85 | #define wrap_read_unlock() read_unlock(&std_rw_lock) |
86 | |
1f5845d5 |
87 | #define wrap_read_lock_inatomic() read_lock(&std_rw_lock) |
88 | #define wrap_read_trylock_inatomic() read_trylock(&std_rw_lock) |
89 | #define wrap_read_unlock_inatomic() read_unlock(&std_rw_lock) |
90 | |
cd7cf33d |
91 | #define wrap_read_lock_irq() read_lock(&std_rw_lock) |
92 | #define wrap_read_trylock_irq() read_trylock(&std_rw_lock) |
93 | #define wrap_read_unlock_irq() read_unlock(&std_rw_lock) |
94 | |
95 | #if (TEST_INTERRUPTS) |
96 | #define wrap_write_lock() write_lock_irq(&std_rw_lock) |
97 | #define wrap_write_unlock() write_unlock_irq(&std_rw_lock) |
98 | #else |
99 | #define wrap_write_lock() write_lock(&std_rw_lock) |
100 | #define wrap_write_unlock() write_unlock(&std_rw_lock) |
101 | #endif |
102 | |
103 | #else |
104 | |
0e0fdeb6 |
105 | static DEFINE_WBIAS_RWLOCK(wbiasrwlock); |
f0a36bb1 |
106 | |
0e0fdeb6 |
107 | #define wrap_read_lock() wbias_read_lock(&wbiasrwlock) |
108 | #define wrap_read_trylock() wbias_read_trylock(&wbiasrwlock) |
109 | #define wrap_read_unlock() wbias_read_unlock(&wbiasrwlock) |
cd7cf33d |
110 | |
1f5845d5 |
111 | #define wrap_read_lock_inatomic() wbias_read_lock_inatomic(&wbiasrwlock) |
112 | #define wrap_read_trylock_inatomic() \ |
113 | wbias_read_trylock_inatomic(&wbiasrwlock) |
114 | #define wrap_read_unlock_inatomic() \ |
115 | wbias_read_unlock_inatomic(&wbiasrwlock) |
116 | |
0e0fdeb6 |
117 | #define wrap_read_lock_irq() wbias_read_lock_irq(&wbiasrwlock) |
118 | #define wrap_read_trylock_irq() wbias_read_trylock_irq(&wbiasrwlock) |
119 | #define wrap_read_unlock_irq() wbias_read_unlock_irq(&wbiasrwlock) |
cd7cf33d |
120 | |
121 | #if (TEST_INTERRUPTS) |
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122 | #define wrap_write_lock() wbias_write_lock_irq(&wbiasrwlock) |
123 | #define wrap_write_unlock() wbias_write_unlock_irq(&wbiasrwlock) |
cd7cf33d |
124 | #else |
0e0fdeb6 |
125 | #define wrap_write_lock() wbias_write_lock(&wbiasrwlock) |
126 | #define wrap_write_unlock() wbias_write_unlock(&wbiasrwlock) |
cd7cf33d |
127 | #endif |
128 | |
129 | #endif |
130 | |
68f25f81 |
131 | static cycles_t cycles_calibration_min, |
132 | cycles_calibration_avg, |
133 | cycles_calibration_max; |
134 | |
135 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
136 | { |
137 | return cycles - cycles_calibration_avg; |
138 | } |
139 | |
f0a36bb1 |
140 | struct proc_dir_entry *pentry = NULL; |
141 | |
b37c9208 |
142 | static int p_or_np_reader_thread(const char *typename, |
143 | void *data, int preemptable) |
f0a36bb1 |
144 | { |
145 | int i; |
146 | int prev, cur; |
147 | unsigned long iter = 0; |
68f25f81 |
148 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
149 | delayavg = 0; |
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150 | |
b37c9208 |
151 | printk("%s/%lu runnning\n", typename, (unsigned long)data); |
f0a36bb1 |
152 | do { |
153 | iter++; |
1f5845d5 |
154 | if (!preemptable) |
155 | preempt_disable(); |
68f25f81 |
156 | rdtsc_barrier(); |
7f563886 |
157 | time1 = get_cycles(); |
68f25f81 |
158 | rdtsc_barrier(); |
159 | |
1f5845d5 |
160 | if (!preemptable) |
161 | wrap_read_lock_inatomic(); |
162 | else |
163 | wrap_read_lock(); |
68f25f81 |
164 | |
165 | rdtsc_barrier(); |
7f563886 |
166 | time2 = get_cycles(); |
68f25f81 |
167 | rdtsc_barrier(); |
168 | delay = time2 - time1; |
169 | delaymax = max(delaymax, delay); |
170 | delaymin = min(delaymin, delay); |
171 | delayavg += delay; |
f0a36bb1 |
172 | prev = var[0]; |
173 | for (i = 1; i < NR_VARS; i++) { |
174 | cur = var[i]; |
175 | if (cur != prev) |
176 | printk(KERN_ALERT |
177 | "Unequal cur %d/prev %d at i %d, iter %lu " |
178 | "in thread\n", cur, prev, i, iter); |
179 | } |
cd7cf33d |
180 | |
1f5845d5 |
181 | if (!preemptable) |
182 | wrap_read_unlock_inatomic(); |
183 | else |
184 | wrap_read_unlock(); |
185 | if (!preemptable) |
186 | preempt_enable(); |
4fd25765 |
187 | if (THREAD_READER_DELAY) |
188 | msleep(THREAD_READER_DELAY); |
f0a36bb1 |
189 | } while (!kthread_should_stop()); |
4fd25765 |
190 | if (!iter) { |
b37c9208 |
191 | printk("%s/%lu iterations : %lu", typename, |
4fd25765 |
192 | (unsigned long)data, iter); |
193 | } else { |
194 | delayavg /= iter; |
b37c9208 |
195 | printk("%s/%lu iterations : %lu, " |
4fd25765 |
196 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
b37c9208 |
197 | typename, |
4fd25765 |
198 | (unsigned long)data, iter, |
199 | calibrate_cycles(delaymin), |
200 | calibrate_cycles(delayavg), |
201 | calibrate_cycles(delaymax)); |
202 | } |
f0a36bb1 |
203 | return 0; |
204 | } |
205 | |
1f5845d5 |
206 | static int preader_thread(void *data) |
207 | { |
b37c9208 |
208 | return p_or_np_reader_thread("preader_thread", data, 1); |
1f5845d5 |
209 | } |
210 | |
211 | static int npreader_thread(void *data) |
212 | { |
b37c9208 |
213 | return p_or_np_reader_thread("npreader_thread", data, 0); |
1f5845d5 |
214 | } |
215 | |
1c21e42c |
216 | static int trylock_reader_thread(void *data) |
217 | { |
218 | int i; |
219 | int prev, cur; |
220 | unsigned long iter = 0, success_iter = 0; |
221 | |
222 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
223 | do { |
cd7cf33d |
224 | while (!wrap_read_trylock()) |
1c21e42c |
225 | iter++; |
226 | success_iter++; |
227 | prev = var[0]; |
228 | for (i = 1; i < NR_VARS; i++) { |
229 | cur = var[i]; |
230 | if (cur != prev) |
231 | printk(KERN_ALERT |
232 | "Unequal cur %d/prev %d at i %d, iter %lu " |
233 | "in thread\n", cur, prev, i, iter); |
234 | } |
cd7cf33d |
235 | wrap_read_unlock(); |
4fd25765 |
236 | if (THREAD_READER_DELAY) |
237 | msleep(THREAD_READER_DELAY); |
1c21e42c |
238 | } while (!kthread_should_stop()); |
239 | printk("trylock_reader_thread/%lu iterations : %lu, " |
240 | "successful iterations : %lu\n", |
241 | (unsigned long)data, iter, success_iter); |
242 | return 0; |
243 | } |
244 | |
68f25f81 |
245 | DEFINE_PER_CPU(cycles_t, int_delaymin); |
246 | DEFINE_PER_CPU(cycles_t, int_delayavg); |
7f563886 |
247 | DEFINE_PER_CPU(cycles_t, int_delaymax); |
68f25f81 |
248 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
249 | |
f0a36bb1 |
250 | static void interrupt_reader_ipi(void *data) |
251 | { |
252 | int i; |
253 | int prev, cur; |
7f563886 |
254 | cycles_t time1, time2; |
68f25f81 |
255 | cycles_t *delaymax, *delaymin, *delayavg, *ipi_nr, delay; |
7f563886 |
256 | |
257 | /* |
258 | * Skip the ipi caller, not in irq context. |
259 | */ |
260 | if (!in_irq()) |
261 | return; |
f0a36bb1 |
262 | |
7f563886 |
263 | delaymax = &per_cpu(int_delaymax, smp_processor_id()); |
68f25f81 |
264 | delaymin = &per_cpu(int_delaymin, smp_processor_id()); |
265 | delayavg = &per_cpu(int_delayavg, smp_processor_id()); |
266 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
267 | |
268 | rdtsc_barrier(); |
7f563886 |
269 | time1 = get_cycles(); |
68f25f81 |
270 | rdtsc_barrier(); |
271 | |
cd7cf33d |
272 | wrap_read_lock_irq(); |
68f25f81 |
273 | |
274 | rdtsc_barrier(); |
7f563886 |
275 | time2 = get_cycles(); |
68f25f81 |
276 | rdtsc_barrier(); |
277 | delay = time2 - time1; |
278 | *delaymax = max(*delaymax, delay); |
279 | *delaymin = min(*delaymin, delay); |
280 | *delayavg += delay; |
281 | (*ipi_nr)++; |
f0a36bb1 |
282 | prev = var[0]; |
283 | for (i = 1; i < NR_VARS; i++) { |
284 | cur = var[i]; |
285 | if (cur != prev) |
286 | printk(KERN_ALERT |
287 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
288 | cur, prev, i); |
289 | } |
cd7cf33d |
290 | wrap_read_unlock_irq(); |
f0a36bb1 |
291 | } |
292 | |
1c21e42c |
293 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
294 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
295 | |
296 | static void trylock_interrupt_reader_ipi(void *data) |
297 | { |
298 | int i; |
299 | int prev, cur; |
300 | |
301 | /* |
302 | * Skip the ipi caller, not in irq context. |
303 | */ |
304 | if (!in_irq()) |
305 | return; |
306 | |
307 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
308 | while (!wrap_read_trylock_irq()) |
1c21e42c |
309 | per_cpu(trylock_int_iter, smp_processor_id())++; |
310 | per_cpu(trylock_int_success, smp_processor_id())++; |
311 | prev = var[0]; |
312 | for (i = 1; i < NR_VARS; i++) { |
313 | cur = var[i]; |
314 | if (cur != prev) |
315 | printk(KERN_ALERT |
316 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
317 | cur, prev, i); |
318 | } |
cd7cf33d |
319 | wrap_read_unlock_irq(); |
1c21e42c |
320 | } |
321 | |
322 | |
f0a36bb1 |
323 | static int interrupt_reader_thread(void *data) |
324 | { |
325 | unsigned long iter = 0; |
7f563886 |
326 | int i; |
327 | |
68f25f81 |
328 | for_each_online_cpu(i) { |
329 | per_cpu(int_delaymax, i) = 0; |
330 | per_cpu(int_delaymin, i) = ULLONG_MAX; |
331 | per_cpu(int_delayavg, i) = 0; |
332 | per_cpu(int_ipi_nr, i) = 0; |
333 | } |
f0a36bb1 |
334 | do { |
335 | iter++; |
336 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
337 | if (INTERRUPT_READER_DELAY) |
338 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
339 | } while (!kthread_should_stop()); |
340 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
341 | (unsigned long)data, iter); |
7f563886 |
342 | for_each_online_cpu(i) { |
4fd25765 |
343 | if (!per_cpu(int_ipi_nr, i)) |
344 | continue; |
68f25f81 |
345 | per_cpu(int_delayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
346 | printk("interrupt readers on CPU %i, " |
68f25f81 |
347 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
348 | i, |
349 | calibrate_cycles(per_cpu(int_delaymin, i)), |
350 | calibrate_cycles(per_cpu(int_delayavg, i)), |
351 | calibrate_cycles(per_cpu(int_delaymax, i))); |
7f563886 |
352 | } |
f0a36bb1 |
353 | return 0; |
354 | } |
355 | |
1c21e42c |
356 | static int trylock_interrupt_reader_thread(void *data) |
357 | { |
358 | unsigned long iter = 0; |
359 | int i; |
360 | |
361 | do { |
362 | iter++; |
363 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
364 | if (INTERRUPT_READER_DELAY) |
365 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
366 | } while (!kthread_should_stop()); |
367 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
368 | (unsigned long)data, iter); |
369 | for_each_online_cpu(i) { |
370 | printk("trylock interrupt readers on CPU %i, " |
371 | "iterations %lu, " |
372 | "successful iterations : %lu\n", |
373 | i, per_cpu(trylock_int_iter, i), |
374 | per_cpu(trylock_int_success, i)); |
68f25f81 |
375 | per_cpu(trylock_int_iter, i) = 0; |
376 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
377 | } |
378 | return 0; |
379 | } |
380 | |
f0a36bb1 |
381 | static int writer_thread(void *data) |
382 | { |
383 | int i; |
384 | int new; |
385 | unsigned long iter = 0; |
68f25f81 |
386 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
387 | delayavg = 0; |
f0a36bb1 |
388 | |
389 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
390 | do { |
391 | iter++; |
ae4a4ebf |
392 | //preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
393 | rdtsc_barrier(); |
7f563886 |
394 | time1 = get_cycles(); |
68f25f81 |
395 | rdtsc_barrier(); |
396 | |
cd7cf33d |
397 | wrap_write_lock(); |
68f25f81 |
398 | |
399 | rdtsc_barrier(); |
7f563886 |
400 | time2 = get_cycles(); |
68f25f81 |
401 | rdtsc_barrier(); |
402 | delay = time2 - time1; |
403 | delaymax = max(delaymax, delay); |
404 | delaymin = min(delaymin, delay); |
405 | delayavg += delay; |
f0a36bb1 |
406 | new = (int)get_cycles(); |
407 | for (i = 0; i < NR_VARS; i++) { |
408 | var[i] = new; |
409 | } |
cd7cf33d |
410 | |
411 | wrap_write_unlock(); |
412 | |
ae4a4ebf |
413 | //preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
414 | if (WRITER_DELAY > 0) |
4d1751f9 |
415 | udelay(WRITER_DELAY); |
f0a36bb1 |
416 | } while (!kthread_should_stop()); |
68f25f81 |
417 | delayavg /= iter; |
7f563886 |
418 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
419 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
420 | (unsigned long)data, iter, |
421 | calibrate_cycles(delaymin), |
422 | calibrate_cycles(delayavg), |
423 | calibrate_cycles(delaymax)); |
f0a36bb1 |
424 | return 0; |
425 | } |
426 | |
cd7cf33d |
427 | #if (TEST_STD_RWLOCK) |
428 | static int trylock_writer_thread(void *data) |
429 | { |
430 | int i; |
431 | int new; |
432 | unsigned long iter = 0, success = 0, fail = 0; |
433 | |
434 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
435 | do { |
436 | #if (TEST_INTERRUPTS) |
437 | /* std write trylock cannot disable interrupts. */ |
438 | local_irq_disable(); |
439 | #endif |
440 | |
441 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
442 | for (;;) { |
443 | iter++; |
444 | if (write_trylock(&std_rw_lock)) |
445 | goto locked; |
446 | } |
447 | #else |
448 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
449 | iter++; |
450 | if (write_trylock(&std_rw_lock)) |
451 | goto locked; |
452 | } |
453 | #endif |
454 | fail++; |
455 | #if (TEST_INTERRUPTS) |
456 | local_irq_enable(); |
457 | #endif |
458 | goto loop; |
459 | locked: |
460 | success++; |
461 | new = (int)get_cycles(); |
462 | for (i = 0; i < NR_VARS; i++) { |
463 | var[i] = new; |
464 | } |
465 | #if (TEST_INTERRUPTS) |
466 | write_unlock_irq(&std_rw_lock); |
467 | #else |
468 | write_unlock(&std_rw_lock); |
469 | #endif |
470 | loop: |
471 | if (TRYLOCK_WRITER_DELAY > 0) |
472 | udelay(TRYLOCK_WRITER_DELAY); |
473 | } while (!kthread_should_stop()); |
474 | printk("trylock_writer_thread/%lu iterations : " |
475 | "[try,success,fail after %d try], " |
476 | "%lu,%lu,%lu\n", |
477 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
478 | iter, success, fail); |
479 | return 0; |
480 | } |
481 | |
482 | #else /* !TEST_STD_RWLOCK */ |
483 | |
1c21e42c |
484 | static int trylock_writer_thread(void *data) |
485 | { |
486 | int i; |
487 | int new; |
4fd25765 |
488 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
489 | |
490 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
491 | do { |
4fd25765 |
492 | iter++; |
493 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
494 | if (wbias_write_trylock_irq_else_subscribe(&wbiasrwlock)) |
4fd25765 |
495 | #else |
0e0fdeb6 |
496 | if (wbias_write_trylock_else_subscribe(&wbiasrwlock)) |
4fd25765 |
497 | #endif |
498 | goto locked; |
cd7cf33d |
499 | |
4fd25765 |
500 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
501 | for (;;) { |
1c21e42c |
502 | iter++; |
4fd25765 |
503 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
504 | if (wbias_write_trylock_irq_subscribed(&wbiasrwlock)) |
4fd25765 |
505 | #else |
0e0fdeb6 |
506 | if (wbias_write_trylock_subscribed(&wbiasrwlock)) |
4fd25765 |
507 | #endif |
508 | goto locked; |
1c21e42c |
509 | } |
4fd25765 |
510 | #else |
cd7cf33d |
511 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
512 | iter++; |
513 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
514 | if (wbias_write_trylock_irq_subscribed(&wbiasrwlock)) |
4fd25765 |
515 | #else |
0e0fdeb6 |
516 | if (wbias_write_trylock_subscribed(&wbiasrwlock)) |
4fd25765 |
517 | #endif |
518 | goto locked; |
519 | } |
520 | #endif |
521 | fail++; |
0e0fdeb6 |
522 | wbias_write_unsubscribe(&wbiasrwlock); |
4fd25765 |
523 | goto loop; |
524 | locked: |
1c21e42c |
525 | success++; |
1c21e42c |
526 | new = (int)get_cycles(); |
527 | for (i = 0; i < NR_VARS; i++) { |
528 | var[i] = new; |
529 | } |
4fd25765 |
530 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
531 | wbias_write_unlock_irq(&wbiasrwlock); |
4fd25765 |
532 | #else |
0e0fdeb6 |
533 | wbias_write_unlock(&wbiasrwlock); |
4fd25765 |
534 | #endif |
535 | loop: |
536 | if (TRYLOCK_WRITER_DELAY > 0) |
537 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
538 | } while (!kthread_should_stop()); |
4fd25765 |
539 | printk("trylock_writer_thread/%lu iterations : " |
540 | "[try,success,fail after %d try], " |
541 | "%lu,%lu,%lu\n", |
542 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
543 | iter, success, fail); |
1c21e42c |
544 | return 0; |
545 | } |
546 | |
cd7cf33d |
547 | #endif /* TEST_STD_RWLOCK */ |
548 | |
0e0fdeb6 |
549 | static void wbias_rwlock_create(void) |
f0a36bb1 |
550 | { |
551 | unsigned long i; |
552 | |
1f5845d5 |
553 | for (i = 0; i < NR_PREADERS; i++) { |
554 | printk("starting preemptable reader thread %lu\n", i); |
555 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
556 | "wbiasrwlock_preader"); |
557 | BUG_ON(!preader_threads[i]); |
558 | } |
559 | |
560 | for (i = 0; i < NR_NPREADERS; i++) { |
561 | printk("starting non-preemptable reader thread %lu\n", i); |
562 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
563 | "wbiasrwlock_npreader"); |
564 | BUG_ON(!npreader_threads[i]); |
f0a36bb1 |
565 | } |
566 | |
1c21e42c |
567 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
568 | printk("starting trylock reader thread %lu\n", i); |
569 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
0e0fdeb6 |
570 | (void *)i, "wbiasrwlock_trylock_reader"); |
1c21e42c |
571 | BUG_ON(!trylock_reader_threads[i]); |
572 | } |
4fd25765 |
573 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
574 | printk("starting interrupt reader %lu\n", i); |
575 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
576 | (void *)i, |
0e0fdeb6 |
577 | "wbiasrwlock_interrupt_reader"); |
4fd25765 |
578 | } |
579 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
580 | printk("starting trylock interrupt reader %lu\n", i); |
581 | trylock_interrupt_reader[i] = |
582 | kthread_run(trylock_interrupt_reader_thread, |
0e0fdeb6 |
583 | (void *)i, "wbiasrwlock_trylock_interrupt_reader"); |
4fd25765 |
584 | } |
f0a36bb1 |
585 | for (i = 0; i < NR_WRITERS; i++) { |
586 | printk("starting writer thread %lu\n", i); |
587 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
0e0fdeb6 |
588 | "wbiasrwlock_writer"); |
f0a36bb1 |
589 | BUG_ON(!writer_threads[i]); |
590 | } |
1c21e42c |
591 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
592 | printk("starting trylock writer thread %lu\n", i); |
593 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
0e0fdeb6 |
594 | (void *)i, "wbiasrwlock_trylock_writer"); |
1c21e42c |
595 | BUG_ON(!trylock_writer_threads[i]); |
596 | } |
f0a36bb1 |
597 | } |
598 | |
0e0fdeb6 |
599 | static void wbias_rwlock_stop(void) |
f0a36bb1 |
600 | { |
601 | unsigned long i; |
602 | |
1c21e42c |
603 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
604 | kthread_stop(writer_threads[i]); |
1c21e42c |
605 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
606 | kthread_stop(trylock_writer_threads[i]); |
1f5845d5 |
607 | for (i = 0; i < NR_NPREADERS; i++) |
608 | kthread_stop(npreader_threads[i]); |
609 | for (i = 0; i < NR_PREADERS; i++) |
610 | kthread_stop(preader_threads[i]); |
1c21e42c |
611 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
612 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
613 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
614 | kthread_stop(interrupt_reader[i]); |
615 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
616 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
617 | } |
618 | |
619 | |
620 | static void perform_test(const char *name, void (*callback)(void)) |
621 | { |
622 | printk("%s\n", name); |
623 | callback(); |
624 | } |
625 | |
626 | static int my_open(struct inode *inode, struct file *file) |
627 | { |
68f25f81 |
628 | unsigned long i; |
629 | cycles_t time1, time2, delay; |
630 | |
631 | printk("** get_cycles calibration **\n"); |
632 | cycles_calibration_min = ULLONG_MAX; |
633 | cycles_calibration_avg = 0; |
634 | cycles_calibration_max = 0; |
635 | |
636 | local_irq_disable(); |
637 | for (i = 0; i < 10; i++) { |
638 | rdtsc_barrier(); |
639 | time1 = get_cycles(); |
640 | rdtsc_barrier(); |
641 | rdtsc_barrier(); |
642 | time2 = get_cycles(); |
643 | rdtsc_barrier(); |
644 | delay = time2 - time1; |
645 | cycles_calibration_min = min(cycles_calibration_min, delay); |
646 | cycles_calibration_avg += delay; |
647 | cycles_calibration_max = max(cycles_calibration_max, delay); |
648 | } |
649 | cycles_calibration_avg /= 10; |
650 | local_irq_enable(); |
651 | |
652 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
653 | "results calibrated on avg\n", |
654 | cycles_calibration_min, |
655 | cycles_calibration_avg, |
656 | cycles_calibration_max); |
193771da |
657 | printk("\n"); |
68f25f81 |
658 | |
659 | printk("** Single writer test, no contention **\n"); |
dac86829 |
660 | wbias_rwlock_profile_latency_reset(); |
68f25f81 |
661 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
662 | "wbiasrwlock_writer"); |
68f25f81 |
663 | BUG_ON(!writer_threads[0]); |
664 | ssleep(SINGLE_WRITER_TEST_DURATION); |
665 | kthread_stop(writer_threads[0]); |
193771da |
666 | printk("\n"); |
68f25f81 |
667 | |
dac86829 |
668 | wbias_rwlock_profile_latency_print(); |
669 | |
4fd25765 |
670 | printk("** Single trylock writer test, no contention **\n"); |
dac86829 |
671 | wbias_rwlock_profile_latency_reset(); |
4fd25765 |
672 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
673 | (void *)0, |
0e0fdeb6 |
674 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
675 | BUG_ON(!trylock_writer_threads[0]); |
676 | ssleep(SINGLE_WRITER_TEST_DURATION); |
677 | kthread_stop(trylock_writer_threads[0]); |
193771da |
678 | printk("\n"); |
4fd25765 |
679 | |
dac86829 |
680 | wbias_rwlock_profile_latency_print(); |
681 | |
1f5845d5 |
682 | printk("** Single preemptable reader test, no contention **\n"); |
683 | wbias_rwlock_profile_latency_reset(); |
684 | preader_threads[0] = kthread_run(preader_thread, (void *)0, |
685 | "wbiasrwlock_preader"); |
686 | BUG_ON(!preader_threads[0]); |
687 | ssleep(SINGLE_READER_TEST_DURATION); |
688 | kthread_stop(preader_threads[0]); |
689 | printk("\n"); |
690 | |
691 | wbias_rwlock_profile_latency_print(); |
692 | |
693 | printk("** Single non-preemptable reader test, no contention **\n"); |
dac86829 |
694 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
695 | npreader_threads[0] = kthread_run(npreader_thread, (void *)0, |
696 | "wbiasrwlock_npreader"); |
697 | BUG_ON(!npreader_threads[0]); |
68f25f81 |
698 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
699 | kthread_stop(npreader_threads[0]); |
193771da |
700 | printk("\n"); |
68f25f81 |
701 | |
dac86829 |
702 | wbias_rwlock_profile_latency_print(); |
703 | |
1f5845d5 |
704 | printk("** Multiple p/non-p readers test, no contention **\n"); |
dac86829 |
705 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
706 | for (i = 0; i < NR_PREADERS; i++) { |
707 | printk("starting preader thread %lu\n", i); |
708 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
709 | "wbiasrwlock_preader"); |
710 | BUG_ON(!preader_threads[i]); |
711 | } |
712 | for (i = 0; i < NR_NPREADERS; i++) { |
713 | printk("starting npreader thread %lu\n", i); |
714 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
715 | "wbiasrwlock_npreader"); |
716 | BUG_ON(!npreader_threads[i]); |
68f25f81 |
717 | } |
718 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
719 | for (i = 0; i < NR_NPREADERS; i++) |
720 | kthread_stop(npreader_threads[i]); |
721 | for (i = 0; i < NR_PREADERS; i++) |
722 | kthread_stop(preader_threads[i]); |
193771da |
723 | printk("\n"); |
68f25f81 |
724 | |
dac86829 |
725 | wbias_rwlock_profile_latency_print(); |
726 | |
68f25f81 |
727 | printk("** High contention test **\n"); |
dac86829 |
728 | wbias_rwlock_profile_latency_reset(); |
0e0fdeb6 |
729 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
730 | ssleep(TEST_DURATION); |
0e0fdeb6 |
731 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
193771da |
732 | printk("\n"); |
dac86829 |
733 | wbias_rwlock_profile_latency_print(); |
f0a36bb1 |
734 | |
735 | return -EPERM; |
736 | } |
737 | |
738 | |
739 | static struct file_operations my_operations = { |
740 | .open = my_open, |
741 | }; |
742 | |
743 | int init_module(void) |
744 | { |
0e0fdeb6 |
745 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
746 | if (pentry) |
747 | pentry->proc_fops = &my_operations; |
748 | |
d1f36a28 |
749 | printk("PTHREAD_ROFFSET : %016lX\n", PTHREAD_ROFFSET); |
750 | printk("PTHREAD_RMASK : %016lX\n", PTHREAD_RMASK); |
751 | printk("NPTHREAD_ROFFSET : %016lX\n", NPTHREAD_ROFFSET); |
752 | printk("NPTHREAD_RMASK : %016lX\n", NPTHREAD_RMASK); |
753 | printk("SOFTIRQ_ROFFSET : %016lX\n", SOFTIRQ_ROFFSET); |
754 | printk("SOFTIRQ_RMASK : %016lX\n", SOFTIRQ_RMASK); |
755 | printk("HARDIRQ_ROFFSET : %016lX\n", HARDIRQ_ROFFSET); |
756 | printk("HARDIRQ_RMASK : %016lX\n", HARDIRQ_RMASK); |
757 | printk("PTHREAD_WOFFSET : %016lX\n", PTHREAD_WOFFSET); |
758 | printk("PTHREAD_WMASK : %016lX\n", PTHREAD_WMASK); |
759 | printk("NPTHREAD_WOFFSET : %016lX\n", NPTHREAD_WOFFSET); |
760 | printk("NPTHREAD_WMASK : %016lX\n", NPTHREAD_WMASK); |
761 | printk("WRITER_MUTEX : %016lX\n", WRITER_MUTEX); |
762 | printk("SOFTIRQ_WMASK : %016lX\n", SOFTIRQ_WMASK); |
763 | printk("HARDIRQ_WMASK : %016lX\n", HARDIRQ_WMASK); |
f0a36bb1 |
764 | |
765 | return 0; |
766 | } |
767 | |
768 | void cleanup_module(void) |
769 | { |
0e0fdeb6 |
770 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
771 | } |
772 | |
773 | MODULE_LICENSE("GPL"); |
774 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
775 | MODULE_DESCRIPTION("wbias rwlock test"); |