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 |
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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 |
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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]; |
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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 | |
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140 | struct proc_dir_entry *pentry = NULL; |
141 | |
1f5845d5 |
142 | static int p_or_np_reader_thread(void *data, int preemptable) |
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143 | { |
144 | int i; |
145 | int prev, cur; |
146 | unsigned long iter = 0; |
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147 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
148 | delayavg = 0; |
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149 | |
150 | printk("reader_thread/%lu runnning\n", (unsigned long)data); |
151 | do { |
152 | iter++; |
1f5845d5 |
153 | if (!preemptable) |
154 | preempt_disable(); |
68f25f81 |
155 | rdtsc_barrier(); |
7f563886 |
156 | time1 = get_cycles(); |
68f25f81 |
157 | rdtsc_barrier(); |
158 | |
1f5845d5 |
159 | if (!preemptable) |
160 | wrap_read_lock_inatomic(); |
161 | else |
162 | wrap_read_lock(); |
68f25f81 |
163 | |
164 | rdtsc_barrier(); |
7f563886 |
165 | time2 = get_cycles(); |
68f25f81 |
166 | rdtsc_barrier(); |
167 | delay = time2 - time1; |
168 | delaymax = max(delaymax, delay); |
169 | delaymin = min(delaymin, delay); |
170 | delayavg += delay; |
f0a36bb1 |
171 | prev = var[0]; |
172 | for (i = 1; i < NR_VARS; i++) { |
173 | cur = var[i]; |
174 | if (cur != prev) |
175 | printk(KERN_ALERT |
176 | "Unequal cur %d/prev %d at i %d, iter %lu " |
177 | "in thread\n", cur, prev, i, iter); |
178 | } |
cd7cf33d |
179 | |
1f5845d5 |
180 | if (!preemptable) |
181 | wrap_read_unlock_inatomic(); |
182 | else |
183 | wrap_read_unlock(); |
184 | if (!preemptable) |
185 | preempt_enable(); |
4fd25765 |
186 | if (THREAD_READER_DELAY) |
187 | msleep(THREAD_READER_DELAY); |
f0a36bb1 |
188 | } while (!kthread_should_stop()); |
4fd25765 |
189 | if (!iter) { |
190 | printk("reader_thread/%lu iterations : %lu", |
191 | (unsigned long)data, iter); |
192 | } else { |
193 | delayavg /= iter; |
194 | printk("reader_thread/%lu iterations : %lu, " |
195 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
196 | (unsigned long)data, iter, |
197 | calibrate_cycles(delaymin), |
198 | calibrate_cycles(delayavg), |
199 | calibrate_cycles(delaymax)); |
200 | } |
f0a36bb1 |
201 | return 0; |
202 | } |
203 | |
1f5845d5 |
204 | static int preader_thread(void *data) |
205 | { |
206 | return p_or_np_reader_thread(data, 1); |
207 | } |
208 | |
209 | static int npreader_thread(void *data) |
210 | { |
211 | return p_or_np_reader_thread(data, 0); |
212 | } |
213 | |
1c21e42c |
214 | static int trylock_reader_thread(void *data) |
215 | { |
216 | int i; |
217 | int prev, cur; |
218 | unsigned long iter = 0, success_iter = 0; |
219 | |
220 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
221 | do { |
cd7cf33d |
222 | while (!wrap_read_trylock()) |
1c21e42c |
223 | iter++; |
224 | success_iter++; |
225 | prev = var[0]; |
226 | for (i = 1; i < NR_VARS; i++) { |
227 | cur = var[i]; |
228 | if (cur != prev) |
229 | printk(KERN_ALERT |
230 | "Unequal cur %d/prev %d at i %d, iter %lu " |
231 | "in thread\n", cur, prev, i, iter); |
232 | } |
cd7cf33d |
233 | wrap_read_unlock(); |
4fd25765 |
234 | if (THREAD_READER_DELAY) |
235 | msleep(THREAD_READER_DELAY); |
1c21e42c |
236 | } while (!kthread_should_stop()); |
237 | printk("trylock_reader_thread/%lu iterations : %lu, " |
238 | "successful iterations : %lu\n", |
239 | (unsigned long)data, iter, success_iter); |
240 | return 0; |
241 | } |
242 | |
68f25f81 |
243 | DEFINE_PER_CPU(cycles_t, int_delaymin); |
244 | DEFINE_PER_CPU(cycles_t, int_delayavg); |
7f563886 |
245 | DEFINE_PER_CPU(cycles_t, int_delaymax); |
68f25f81 |
246 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
247 | |
f0a36bb1 |
248 | static void interrupt_reader_ipi(void *data) |
249 | { |
250 | int i; |
251 | int prev, cur; |
7f563886 |
252 | cycles_t time1, time2; |
68f25f81 |
253 | cycles_t *delaymax, *delaymin, *delayavg, *ipi_nr, delay; |
7f563886 |
254 | |
255 | /* |
256 | * Skip the ipi caller, not in irq context. |
257 | */ |
258 | if (!in_irq()) |
259 | return; |
f0a36bb1 |
260 | |
7f563886 |
261 | delaymax = &per_cpu(int_delaymax, smp_processor_id()); |
68f25f81 |
262 | delaymin = &per_cpu(int_delaymin, smp_processor_id()); |
263 | delayavg = &per_cpu(int_delayavg, smp_processor_id()); |
264 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
265 | |
266 | rdtsc_barrier(); |
7f563886 |
267 | time1 = get_cycles(); |
68f25f81 |
268 | rdtsc_barrier(); |
269 | |
cd7cf33d |
270 | wrap_read_lock_irq(); |
68f25f81 |
271 | |
272 | rdtsc_barrier(); |
7f563886 |
273 | time2 = get_cycles(); |
68f25f81 |
274 | rdtsc_barrier(); |
275 | delay = time2 - time1; |
276 | *delaymax = max(*delaymax, delay); |
277 | *delaymin = min(*delaymin, delay); |
278 | *delayavg += delay; |
279 | (*ipi_nr)++; |
f0a36bb1 |
280 | prev = var[0]; |
281 | for (i = 1; i < NR_VARS; i++) { |
282 | cur = var[i]; |
283 | if (cur != prev) |
284 | printk(KERN_ALERT |
285 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
286 | cur, prev, i); |
287 | } |
cd7cf33d |
288 | wrap_read_unlock_irq(); |
f0a36bb1 |
289 | } |
290 | |
1c21e42c |
291 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
292 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
293 | |
294 | static void trylock_interrupt_reader_ipi(void *data) |
295 | { |
296 | int i; |
297 | int prev, cur; |
298 | |
299 | /* |
300 | * Skip the ipi caller, not in irq context. |
301 | */ |
302 | if (!in_irq()) |
303 | return; |
304 | |
305 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
306 | while (!wrap_read_trylock_irq()) |
1c21e42c |
307 | per_cpu(trylock_int_iter, smp_processor_id())++; |
308 | per_cpu(trylock_int_success, smp_processor_id())++; |
309 | prev = var[0]; |
310 | for (i = 1; i < NR_VARS; i++) { |
311 | cur = var[i]; |
312 | if (cur != prev) |
313 | printk(KERN_ALERT |
314 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
315 | cur, prev, i); |
316 | } |
cd7cf33d |
317 | wrap_read_unlock_irq(); |
1c21e42c |
318 | } |
319 | |
320 | |
f0a36bb1 |
321 | static int interrupt_reader_thread(void *data) |
322 | { |
323 | unsigned long iter = 0; |
7f563886 |
324 | int i; |
325 | |
68f25f81 |
326 | for_each_online_cpu(i) { |
327 | per_cpu(int_delaymax, i) = 0; |
328 | per_cpu(int_delaymin, i) = ULLONG_MAX; |
329 | per_cpu(int_delayavg, i) = 0; |
330 | per_cpu(int_ipi_nr, i) = 0; |
331 | } |
f0a36bb1 |
332 | do { |
333 | iter++; |
334 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
335 | if (INTERRUPT_READER_DELAY) |
336 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
337 | } while (!kthread_should_stop()); |
338 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
339 | (unsigned long)data, iter); |
7f563886 |
340 | for_each_online_cpu(i) { |
4fd25765 |
341 | if (!per_cpu(int_ipi_nr, i)) |
342 | continue; |
68f25f81 |
343 | per_cpu(int_delayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
344 | printk("interrupt readers on CPU %i, " |
68f25f81 |
345 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
346 | i, |
347 | calibrate_cycles(per_cpu(int_delaymin, i)), |
348 | calibrate_cycles(per_cpu(int_delayavg, i)), |
349 | calibrate_cycles(per_cpu(int_delaymax, i))); |
7f563886 |
350 | } |
f0a36bb1 |
351 | return 0; |
352 | } |
353 | |
1c21e42c |
354 | static int trylock_interrupt_reader_thread(void *data) |
355 | { |
356 | unsigned long iter = 0; |
357 | int i; |
358 | |
359 | do { |
360 | iter++; |
361 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
362 | if (INTERRUPT_READER_DELAY) |
363 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
364 | } while (!kthread_should_stop()); |
365 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
366 | (unsigned long)data, iter); |
367 | for_each_online_cpu(i) { |
368 | printk("trylock interrupt readers on CPU %i, " |
369 | "iterations %lu, " |
370 | "successful iterations : %lu\n", |
371 | i, per_cpu(trylock_int_iter, i), |
372 | per_cpu(trylock_int_success, i)); |
68f25f81 |
373 | per_cpu(trylock_int_iter, i) = 0; |
374 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
375 | } |
376 | return 0; |
377 | } |
378 | |
f0a36bb1 |
379 | static int writer_thread(void *data) |
380 | { |
381 | int i; |
382 | int new; |
383 | unsigned long iter = 0; |
68f25f81 |
384 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
385 | delayavg = 0; |
f0a36bb1 |
386 | |
387 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
388 | do { |
389 | iter++; |
ae4a4ebf |
390 | //preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
391 | rdtsc_barrier(); |
7f563886 |
392 | time1 = get_cycles(); |
68f25f81 |
393 | rdtsc_barrier(); |
394 | |
cd7cf33d |
395 | wrap_write_lock(); |
68f25f81 |
396 | |
397 | rdtsc_barrier(); |
7f563886 |
398 | time2 = get_cycles(); |
68f25f81 |
399 | rdtsc_barrier(); |
400 | delay = time2 - time1; |
401 | delaymax = max(delaymax, delay); |
402 | delaymin = min(delaymin, delay); |
403 | delayavg += delay; |
f0a36bb1 |
404 | new = (int)get_cycles(); |
405 | for (i = 0; i < NR_VARS; i++) { |
406 | var[i] = new; |
407 | } |
cd7cf33d |
408 | |
409 | wrap_write_unlock(); |
410 | |
ae4a4ebf |
411 | //preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
412 | if (WRITER_DELAY > 0) |
4d1751f9 |
413 | udelay(WRITER_DELAY); |
f0a36bb1 |
414 | } while (!kthread_should_stop()); |
68f25f81 |
415 | delayavg /= iter; |
7f563886 |
416 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
417 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
418 | (unsigned long)data, iter, |
419 | calibrate_cycles(delaymin), |
420 | calibrate_cycles(delayavg), |
421 | calibrate_cycles(delaymax)); |
f0a36bb1 |
422 | return 0; |
423 | } |
424 | |
cd7cf33d |
425 | #if (TEST_STD_RWLOCK) |
426 | static int trylock_writer_thread(void *data) |
427 | { |
428 | int i; |
429 | int new; |
430 | unsigned long iter = 0, success = 0, fail = 0; |
431 | |
432 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
433 | do { |
434 | #if (TEST_INTERRUPTS) |
435 | /* std write trylock cannot disable interrupts. */ |
436 | local_irq_disable(); |
437 | #endif |
438 | |
439 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
440 | for (;;) { |
441 | iter++; |
442 | if (write_trylock(&std_rw_lock)) |
443 | goto locked; |
444 | } |
445 | #else |
446 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
447 | iter++; |
448 | if (write_trylock(&std_rw_lock)) |
449 | goto locked; |
450 | } |
451 | #endif |
452 | fail++; |
453 | #if (TEST_INTERRUPTS) |
454 | local_irq_enable(); |
455 | #endif |
456 | goto loop; |
457 | locked: |
458 | success++; |
459 | new = (int)get_cycles(); |
460 | for (i = 0; i < NR_VARS; i++) { |
461 | var[i] = new; |
462 | } |
463 | #if (TEST_INTERRUPTS) |
464 | write_unlock_irq(&std_rw_lock); |
465 | #else |
466 | write_unlock(&std_rw_lock); |
467 | #endif |
468 | loop: |
469 | if (TRYLOCK_WRITER_DELAY > 0) |
470 | udelay(TRYLOCK_WRITER_DELAY); |
471 | } while (!kthread_should_stop()); |
472 | printk("trylock_writer_thread/%lu iterations : " |
473 | "[try,success,fail after %d try], " |
474 | "%lu,%lu,%lu\n", |
475 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
476 | iter, success, fail); |
477 | return 0; |
478 | } |
479 | |
480 | #else /* !TEST_STD_RWLOCK */ |
481 | |
1c21e42c |
482 | static int trylock_writer_thread(void *data) |
483 | { |
484 | int i; |
485 | int new; |
4fd25765 |
486 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
487 | |
488 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
489 | do { |
4fd25765 |
490 | iter++; |
491 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
492 | if (wbias_write_trylock_irq_else_subscribe(&wbiasrwlock)) |
4fd25765 |
493 | #else |
0e0fdeb6 |
494 | if (wbias_write_trylock_else_subscribe(&wbiasrwlock)) |
4fd25765 |
495 | #endif |
496 | goto locked; |
cd7cf33d |
497 | |
4fd25765 |
498 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
499 | for (;;) { |
1c21e42c |
500 | iter++; |
4fd25765 |
501 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
502 | if (wbias_write_trylock_irq_subscribed(&wbiasrwlock)) |
4fd25765 |
503 | #else |
0e0fdeb6 |
504 | if (wbias_write_trylock_subscribed(&wbiasrwlock)) |
4fd25765 |
505 | #endif |
506 | goto locked; |
1c21e42c |
507 | } |
4fd25765 |
508 | #else |
cd7cf33d |
509 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
510 | iter++; |
511 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
512 | if (wbias_write_trylock_irq_subscribed(&wbiasrwlock)) |
4fd25765 |
513 | #else |
0e0fdeb6 |
514 | if (wbias_write_trylock_subscribed(&wbiasrwlock)) |
4fd25765 |
515 | #endif |
516 | goto locked; |
517 | } |
518 | #endif |
519 | fail++; |
0e0fdeb6 |
520 | wbias_write_unsubscribe(&wbiasrwlock); |
4fd25765 |
521 | goto loop; |
522 | locked: |
1c21e42c |
523 | success++; |
1c21e42c |
524 | new = (int)get_cycles(); |
525 | for (i = 0; i < NR_VARS; i++) { |
526 | var[i] = new; |
527 | } |
4fd25765 |
528 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
529 | wbias_write_unlock_irq(&wbiasrwlock); |
4fd25765 |
530 | #else |
0e0fdeb6 |
531 | wbias_write_unlock(&wbiasrwlock); |
4fd25765 |
532 | #endif |
533 | loop: |
534 | if (TRYLOCK_WRITER_DELAY > 0) |
535 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
536 | } while (!kthread_should_stop()); |
4fd25765 |
537 | printk("trylock_writer_thread/%lu iterations : " |
538 | "[try,success,fail after %d try], " |
539 | "%lu,%lu,%lu\n", |
540 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
541 | iter, success, fail); |
1c21e42c |
542 | return 0; |
543 | } |
544 | |
cd7cf33d |
545 | #endif /* TEST_STD_RWLOCK */ |
546 | |
0e0fdeb6 |
547 | static void wbias_rwlock_create(void) |
f0a36bb1 |
548 | { |
549 | unsigned long i; |
550 | |
1f5845d5 |
551 | for (i = 0; i < NR_PREADERS; i++) { |
552 | printk("starting preemptable reader thread %lu\n", i); |
553 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
554 | "wbiasrwlock_preader"); |
555 | BUG_ON(!preader_threads[i]); |
556 | } |
557 | |
558 | for (i = 0; i < NR_NPREADERS; i++) { |
559 | printk("starting non-preemptable reader thread %lu\n", i); |
560 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
561 | "wbiasrwlock_npreader"); |
562 | BUG_ON(!npreader_threads[i]); |
f0a36bb1 |
563 | } |
564 | |
1c21e42c |
565 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
566 | printk("starting trylock reader thread %lu\n", i); |
567 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
0e0fdeb6 |
568 | (void *)i, "wbiasrwlock_trylock_reader"); |
1c21e42c |
569 | BUG_ON(!trylock_reader_threads[i]); |
570 | } |
4fd25765 |
571 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
572 | printk("starting interrupt reader %lu\n", i); |
573 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
574 | (void *)i, |
0e0fdeb6 |
575 | "wbiasrwlock_interrupt_reader"); |
4fd25765 |
576 | } |
577 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
578 | printk("starting trylock interrupt reader %lu\n", i); |
579 | trylock_interrupt_reader[i] = |
580 | kthread_run(trylock_interrupt_reader_thread, |
0e0fdeb6 |
581 | (void *)i, "wbiasrwlock_trylock_interrupt_reader"); |
4fd25765 |
582 | } |
f0a36bb1 |
583 | for (i = 0; i < NR_WRITERS; i++) { |
584 | printk("starting writer thread %lu\n", i); |
585 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
0e0fdeb6 |
586 | "wbiasrwlock_writer"); |
f0a36bb1 |
587 | BUG_ON(!writer_threads[i]); |
588 | } |
1c21e42c |
589 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
590 | printk("starting trylock writer thread %lu\n", i); |
591 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
0e0fdeb6 |
592 | (void *)i, "wbiasrwlock_trylock_writer"); |
1c21e42c |
593 | BUG_ON(!trylock_writer_threads[i]); |
594 | } |
f0a36bb1 |
595 | } |
596 | |
0e0fdeb6 |
597 | static void wbias_rwlock_stop(void) |
f0a36bb1 |
598 | { |
599 | unsigned long i; |
600 | |
1c21e42c |
601 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
602 | kthread_stop(writer_threads[i]); |
1c21e42c |
603 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
604 | kthread_stop(trylock_writer_threads[i]); |
1f5845d5 |
605 | for (i = 0; i < NR_NPREADERS; i++) |
606 | kthread_stop(npreader_threads[i]); |
607 | for (i = 0; i < NR_PREADERS; i++) |
608 | kthread_stop(preader_threads[i]); |
1c21e42c |
609 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
610 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
611 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
612 | kthread_stop(interrupt_reader[i]); |
613 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
614 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
615 | } |
616 | |
617 | |
618 | static void perform_test(const char *name, void (*callback)(void)) |
619 | { |
620 | printk("%s\n", name); |
621 | callback(); |
622 | } |
623 | |
624 | static int my_open(struct inode *inode, struct file *file) |
625 | { |
68f25f81 |
626 | unsigned long i; |
627 | cycles_t time1, time2, delay; |
628 | |
629 | printk("** get_cycles calibration **\n"); |
630 | cycles_calibration_min = ULLONG_MAX; |
631 | cycles_calibration_avg = 0; |
632 | cycles_calibration_max = 0; |
633 | |
634 | local_irq_disable(); |
635 | for (i = 0; i < 10; i++) { |
636 | rdtsc_barrier(); |
637 | time1 = get_cycles(); |
638 | rdtsc_barrier(); |
639 | rdtsc_barrier(); |
640 | time2 = get_cycles(); |
641 | rdtsc_barrier(); |
642 | delay = time2 - time1; |
643 | cycles_calibration_min = min(cycles_calibration_min, delay); |
644 | cycles_calibration_avg += delay; |
645 | cycles_calibration_max = max(cycles_calibration_max, delay); |
646 | } |
647 | cycles_calibration_avg /= 10; |
648 | local_irq_enable(); |
649 | |
650 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
651 | "results calibrated on avg\n", |
652 | cycles_calibration_min, |
653 | cycles_calibration_avg, |
654 | cycles_calibration_max); |
193771da |
655 | printk("\n"); |
68f25f81 |
656 | |
657 | printk("** Single writer test, no contention **\n"); |
dac86829 |
658 | wbias_rwlock_profile_latency_reset(); |
68f25f81 |
659 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
660 | "wbiasrwlock_writer"); |
68f25f81 |
661 | BUG_ON(!writer_threads[0]); |
662 | ssleep(SINGLE_WRITER_TEST_DURATION); |
663 | kthread_stop(writer_threads[0]); |
193771da |
664 | printk("\n"); |
68f25f81 |
665 | |
dac86829 |
666 | wbias_rwlock_profile_latency_print(); |
667 | |
4fd25765 |
668 | printk("** Single trylock writer test, no contention **\n"); |
dac86829 |
669 | wbias_rwlock_profile_latency_reset(); |
4fd25765 |
670 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
671 | (void *)0, |
0e0fdeb6 |
672 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
673 | BUG_ON(!trylock_writer_threads[0]); |
674 | ssleep(SINGLE_WRITER_TEST_DURATION); |
675 | kthread_stop(trylock_writer_threads[0]); |
193771da |
676 | printk("\n"); |
4fd25765 |
677 | |
dac86829 |
678 | wbias_rwlock_profile_latency_print(); |
679 | |
1f5845d5 |
680 | printk("** Single preemptable reader test, no contention **\n"); |
681 | wbias_rwlock_profile_latency_reset(); |
682 | preader_threads[0] = kthread_run(preader_thread, (void *)0, |
683 | "wbiasrwlock_preader"); |
684 | BUG_ON(!preader_threads[0]); |
685 | ssleep(SINGLE_READER_TEST_DURATION); |
686 | kthread_stop(preader_threads[0]); |
687 | printk("\n"); |
688 | |
689 | wbias_rwlock_profile_latency_print(); |
690 | |
691 | printk("** Single non-preemptable reader test, no contention **\n"); |
dac86829 |
692 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
693 | npreader_threads[0] = kthread_run(npreader_thread, (void *)0, |
694 | "wbiasrwlock_npreader"); |
695 | BUG_ON(!npreader_threads[0]); |
68f25f81 |
696 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
697 | kthread_stop(npreader_threads[0]); |
193771da |
698 | printk("\n"); |
68f25f81 |
699 | |
dac86829 |
700 | wbias_rwlock_profile_latency_print(); |
701 | |
1f5845d5 |
702 | printk("** Multiple p/non-p readers test, no contention **\n"); |
dac86829 |
703 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
704 | for (i = 0; i < NR_PREADERS; i++) { |
705 | printk("starting preader thread %lu\n", i); |
706 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
707 | "wbiasrwlock_preader"); |
708 | BUG_ON(!preader_threads[i]); |
709 | } |
710 | for (i = 0; i < NR_NPREADERS; i++) { |
711 | printk("starting npreader thread %lu\n", i); |
712 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
713 | "wbiasrwlock_npreader"); |
714 | BUG_ON(!npreader_threads[i]); |
68f25f81 |
715 | } |
716 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
717 | for (i = 0; i < NR_NPREADERS; i++) |
718 | kthread_stop(npreader_threads[i]); |
719 | for (i = 0; i < NR_PREADERS; i++) |
720 | kthread_stop(preader_threads[i]); |
193771da |
721 | printk("\n"); |
68f25f81 |
722 | |
dac86829 |
723 | wbias_rwlock_profile_latency_print(); |
724 | |
68f25f81 |
725 | printk("** High contention test **\n"); |
dac86829 |
726 | wbias_rwlock_profile_latency_reset(); |
0e0fdeb6 |
727 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
728 | ssleep(TEST_DURATION); |
0e0fdeb6 |
729 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
193771da |
730 | printk("\n"); |
dac86829 |
731 | wbias_rwlock_profile_latency_print(); |
f0a36bb1 |
732 | |
733 | return -EPERM; |
734 | } |
735 | |
736 | |
737 | static struct file_operations my_operations = { |
738 | .open = my_open, |
739 | }; |
740 | |
741 | int init_module(void) |
742 | { |
0e0fdeb6 |
743 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
744 | if (pentry) |
745 | pentry->proc_fops = &my_operations; |
746 | |
ae4a4ebf |
747 | printk("PTHREAD_ROFFSET : %lX\n", PTHREAD_ROFFSET); |
748 | printk("PTHREAD_RMASK : %lX\n", PTHREAD_RMASK); |
882d31aa |
749 | printk("NPTHREAD_ROFFSET : %lX\n", NPTHREAD_ROFFSET); |
750 | printk("NPTHREAD_RMASK : %lX\n", NPTHREAD_RMASK); |
f0a36bb1 |
751 | printk("SOFTIRQ_ROFFSET : %lX\n", SOFTIRQ_ROFFSET); |
752 | printk("SOFTIRQ_RMASK : %lX\n", SOFTIRQ_RMASK); |
f0a36bb1 |
753 | printk("HARDIRQ_ROFFSET : %lX\n", HARDIRQ_ROFFSET); |
754 | printk("HARDIRQ_RMASK : %lX\n", HARDIRQ_RMASK); |
7f563886 |
755 | printk("SUBSCRIBERS_WOFFSET : %lX\n", SUBSCRIBERS_WOFFSET); |
756 | printk("SUBSCRIBERS_WMASK : %lX\n", SUBSCRIBERS_WMASK); |
757 | printk("WRITER_MUTEX : %lX\n", WRITER_MUTEX); |
ae4a4ebf |
758 | printk("NPTHREAD_WMASK : %lX\n", SOFTIRQ_WMASK); |
7f563886 |
759 | printk("SOFTIRQ_WMASK : %lX\n", SOFTIRQ_WMASK); |
f0a36bb1 |
760 | printk("HARDIRQ_WMASK : %lX\n", HARDIRQ_WMASK); |
761 | |
762 | return 0; |
763 | } |
764 | |
765 | void cleanup_module(void) |
766 | { |
0e0fdeb6 |
767 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
768 | } |
769 | |
770 | MODULE_LICENSE("GPL"); |
771 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
772 | MODULE_DESCRIPTION("wbias rwlock test"); |