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 |
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25 | |
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26 | #define NR_VARS 100 |
1c21e42c |
27 | #define NR_WRITERS 2 |
ca935c46 |
28 | #define NR_TRYLOCK_WRITERS 1 |
1c21e42c |
29 | #define NR_READERS 4 |
ca935c46 |
30 | #define NR_TRYLOCK_READERS 1 |
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31 | |
32 | /* |
33 | * 1 : test standard rwlock |
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34 | * 0 : test wbiasrwlock |
cd7cf33d |
35 | */ |
36 | #define TEST_STD_RWLOCK 0 |
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37 | |
38 | /* |
39 | * 1 : test with thread and interrupt readers. |
40 | * 0 : test only with thread readers. |
41 | */ |
42 | #define TEST_INTERRUPTS 1 |
43 | |
44 | #if (TEST_INTERRUPTS) |
1c21e42c |
45 | #define NR_INTERRUPT_READERS 1 |
46 | #define NR_TRYLOCK_INTERRUPT_READERS 1 |
4fd25765 |
47 | #else |
48 | #define NR_INTERRUPT_READERS 0 |
49 | #define NR_TRYLOCK_INTERRUPT_READERS 0 |
50 | #endif |
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51 | |
4d1751f9 |
52 | /* |
53 | * Writer iteration delay, in us. 0 for busy loop. Caution : writers can |
54 | * starve readers. |
55 | */ |
cd7cf33d |
56 | #define WRITER_DELAY 100 |
4fd25765 |
57 | #define TRYLOCK_WRITER_DELAY 1000 |
58 | |
59 | /* |
60 | * Number of iterations after which a trylock writer fails. |
61 | * -1 for infinite loop. |
62 | */ |
63 | #define TRYLOCK_WRITERS_FAIL_ITER 100 |
64 | |
65 | /* Thread and interrupt reader delay, in ms */ |
66 | #define THREAD_READER_DELAY 0 /* busy loop */ |
67 | #define INTERRUPT_READER_DELAY 100 |
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68 | |
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69 | static int var[NR_VARS]; |
70 | static struct task_struct *reader_threads[NR_READERS]; |
1c21e42c |
71 | static struct task_struct *trylock_reader_threads[NR_TRYLOCK_READERS]; |
f0a36bb1 |
72 | static struct task_struct *writer_threads[NR_WRITERS]; |
1c21e42c |
73 | static struct task_struct *trylock_writer_threads[NR_TRYLOCK_WRITERS]; |
4fd25765 |
74 | static struct task_struct *interrupt_reader[NR_INTERRUPT_READERS]; |
75 | static struct task_struct *trylock_interrupt_reader[NR_TRYLOCK_INTERRUPT_READERS]; |
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76 | |
cd7cf33d |
77 | #if (TEST_STD_RWLOCK) |
78 | |
79 | static DEFINE_RWLOCK(std_rw_lock); |
80 | |
81 | #define wrap_read_lock() read_lock(&std_rw_lock) |
82 | #define wrap_read_trylock() read_trylock(&std_rw_lock) |
83 | #define wrap_read_unlock() read_unlock(&std_rw_lock) |
84 | |
85 | #define wrap_read_lock_irq() read_lock(&std_rw_lock) |
86 | #define wrap_read_trylock_irq() read_trylock(&std_rw_lock) |
87 | #define wrap_read_unlock_irq() read_unlock(&std_rw_lock) |
88 | |
89 | #if (TEST_INTERRUPTS) |
90 | #define wrap_write_lock() write_lock_irq(&std_rw_lock) |
91 | #define wrap_write_unlock() write_unlock_irq(&std_rw_lock) |
92 | #else |
93 | #define wrap_write_lock() write_lock(&std_rw_lock) |
94 | #define wrap_write_unlock() write_unlock(&std_rw_lock) |
95 | #endif |
96 | |
97 | #else |
98 | |
0e0fdeb6 |
99 | static DEFINE_WBIAS_RWLOCK(wbiasrwlock); |
f0a36bb1 |
100 | |
0e0fdeb6 |
101 | #define wrap_read_lock() wbias_read_lock(&wbiasrwlock) |
102 | #define wrap_read_trylock() wbias_read_trylock(&wbiasrwlock) |
103 | #define wrap_read_unlock() wbias_read_unlock(&wbiasrwlock) |
cd7cf33d |
104 | |
0e0fdeb6 |
105 | #define wrap_read_lock_irq() wbias_read_lock_irq(&wbiasrwlock) |
106 | #define wrap_read_trylock_irq() wbias_read_trylock_irq(&wbiasrwlock) |
107 | #define wrap_read_unlock_irq() wbias_read_unlock_irq(&wbiasrwlock) |
cd7cf33d |
108 | |
109 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
110 | #define wrap_write_lock() wbias_write_lock_irq(&wbiasrwlock) |
111 | #define wrap_write_unlock() wbias_write_unlock_irq(&wbiasrwlock) |
cd7cf33d |
112 | #else |
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113 | #define wrap_write_lock() wbias_write_lock(&wbiasrwlock) |
114 | #define wrap_write_unlock() wbias_write_unlock(&wbiasrwlock) |
cd7cf33d |
115 | #endif |
116 | |
117 | #endif |
118 | |
68f25f81 |
119 | static cycles_t cycles_calibration_min, |
120 | cycles_calibration_avg, |
121 | cycles_calibration_max; |
122 | |
123 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
124 | { |
125 | return cycles - cycles_calibration_avg; |
126 | } |
127 | |
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128 | struct proc_dir_entry *pentry = NULL; |
129 | |
130 | static int reader_thread(void *data) |
131 | { |
132 | int i; |
133 | int prev, cur; |
134 | unsigned long iter = 0; |
68f25f81 |
135 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
136 | delayavg = 0; |
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137 | |
138 | printk("reader_thread/%lu runnning\n", (unsigned long)data); |
139 | do { |
140 | iter++; |
7f563886 |
141 | preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
142 | rdtsc_barrier(); |
7f563886 |
143 | time1 = get_cycles(); |
68f25f81 |
144 | rdtsc_barrier(); |
145 | |
cd7cf33d |
146 | wrap_read_lock(); |
68f25f81 |
147 | |
148 | rdtsc_barrier(); |
7f563886 |
149 | time2 = get_cycles(); |
68f25f81 |
150 | rdtsc_barrier(); |
151 | delay = time2 - time1; |
152 | delaymax = max(delaymax, delay); |
153 | delaymin = min(delaymin, delay); |
154 | delayavg += delay; |
f0a36bb1 |
155 | prev = var[0]; |
156 | for (i = 1; i < NR_VARS; i++) { |
157 | cur = var[i]; |
158 | if (cur != prev) |
159 | printk(KERN_ALERT |
160 | "Unequal cur %d/prev %d at i %d, iter %lu " |
161 | "in thread\n", cur, prev, i, iter); |
162 | } |
cd7cf33d |
163 | |
164 | wrap_read_unlock(); |
165 | |
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166 | preempt_enable(); /* for get_cycles accuracy */ |
4fd25765 |
167 | if (THREAD_READER_DELAY) |
168 | msleep(THREAD_READER_DELAY); |
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169 | } while (!kthread_should_stop()); |
4fd25765 |
170 | if (!iter) { |
171 | printk("reader_thread/%lu iterations : %lu", |
172 | (unsigned long)data, iter); |
173 | } else { |
174 | delayavg /= iter; |
175 | printk("reader_thread/%lu iterations : %lu, " |
176 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
177 | (unsigned long)data, iter, |
178 | calibrate_cycles(delaymin), |
179 | calibrate_cycles(delayavg), |
180 | calibrate_cycles(delaymax)); |
181 | } |
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182 | return 0; |
183 | } |
184 | |
1c21e42c |
185 | static int trylock_reader_thread(void *data) |
186 | { |
187 | int i; |
188 | int prev, cur; |
189 | unsigned long iter = 0, success_iter = 0; |
190 | |
191 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
192 | do { |
cd7cf33d |
193 | while (!wrap_read_trylock()) |
1c21e42c |
194 | iter++; |
195 | success_iter++; |
196 | prev = var[0]; |
197 | for (i = 1; i < NR_VARS; i++) { |
198 | cur = var[i]; |
199 | if (cur != prev) |
200 | printk(KERN_ALERT |
201 | "Unequal cur %d/prev %d at i %d, iter %lu " |
202 | "in thread\n", cur, prev, i, iter); |
203 | } |
cd7cf33d |
204 | wrap_read_unlock(); |
4fd25765 |
205 | if (THREAD_READER_DELAY) |
206 | msleep(THREAD_READER_DELAY); |
1c21e42c |
207 | } while (!kthread_should_stop()); |
208 | printk("trylock_reader_thread/%lu iterations : %lu, " |
209 | "successful iterations : %lu\n", |
210 | (unsigned long)data, iter, success_iter); |
211 | return 0; |
212 | } |
213 | |
68f25f81 |
214 | DEFINE_PER_CPU(cycles_t, int_delaymin); |
215 | DEFINE_PER_CPU(cycles_t, int_delayavg); |
7f563886 |
216 | DEFINE_PER_CPU(cycles_t, int_delaymax); |
68f25f81 |
217 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
218 | |
f0a36bb1 |
219 | static void interrupt_reader_ipi(void *data) |
220 | { |
221 | int i; |
222 | int prev, cur; |
7f563886 |
223 | cycles_t time1, time2; |
68f25f81 |
224 | cycles_t *delaymax, *delaymin, *delayavg, *ipi_nr, delay; |
7f563886 |
225 | |
226 | /* |
227 | * Skip the ipi caller, not in irq context. |
228 | */ |
229 | if (!in_irq()) |
230 | return; |
f0a36bb1 |
231 | |
7f563886 |
232 | delaymax = &per_cpu(int_delaymax, smp_processor_id()); |
68f25f81 |
233 | delaymin = &per_cpu(int_delaymin, smp_processor_id()); |
234 | delayavg = &per_cpu(int_delayavg, smp_processor_id()); |
235 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
236 | |
237 | rdtsc_barrier(); |
7f563886 |
238 | time1 = get_cycles(); |
68f25f81 |
239 | rdtsc_barrier(); |
240 | |
cd7cf33d |
241 | wrap_read_lock_irq(); |
68f25f81 |
242 | |
243 | rdtsc_barrier(); |
7f563886 |
244 | time2 = get_cycles(); |
68f25f81 |
245 | rdtsc_barrier(); |
246 | delay = time2 - time1; |
247 | *delaymax = max(*delaymax, delay); |
248 | *delaymin = min(*delaymin, delay); |
249 | *delayavg += delay; |
250 | (*ipi_nr)++; |
f0a36bb1 |
251 | prev = var[0]; |
252 | for (i = 1; i < NR_VARS; i++) { |
253 | cur = var[i]; |
254 | if (cur != prev) |
255 | printk(KERN_ALERT |
256 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
257 | cur, prev, i); |
258 | } |
cd7cf33d |
259 | wrap_read_unlock_irq(); |
f0a36bb1 |
260 | } |
261 | |
1c21e42c |
262 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
263 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
264 | |
265 | static void trylock_interrupt_reader_ipi(void *data) |
266 | { |
267 | int i; |
268 | int prev, cur; |
269 | |
270 | /* |
271 | * Skip the ipi caller, not in irq context. |
272 | */ |
273 | if (!in_irq()) |
274 | return; |
275 | |
276 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
277 | while (!wrap_read_trylock_irq()) |
1c21e42c |
278 | per_cpu(trylock_int_iter, smp_processor_id())++; |
279 | per_cpu(trylock_int_success, smp_processor_id())++; |
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(); |
1c21e42c |
289 | } |
290 | |
291 | |
f0a36bb1 |
292 | static int interrupt_reader_thread(void *data) |
293 | { |
294 | unsigned long iter = 0; |
7f563886 |
295 | int i; |
296 | |
68f25f81 |
297 | for_each_online_cpu(i) { |
298 | per_cpu(int_delaymax, i) = 0; |
299 | per_cpu(int_delaymin, i) = ULLONG_MAX; |
300 | per_cpu(int_delayavg, i) = 0; |
301 | per_cpu(int_ipi_nr, i) = 0; |
302 | } |
f0a36bb1 |
303 | do { |
304 | iter++; |
305 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
306 | if (INTERRUPT_READER_DELAY) |
307 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
308 | } while (!kthread_should_stop()); |
309 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
310 | (unsigned long)data, iter); |
7f563886 |
311 | for_each_online_cpu(i) { |
4fd25765 |
312 | if (!per_cpu(int_ipi_nr, i)) |
313 | continue; |
68f25f81 |
314 | per_cpu(int_delayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
315 | printk("interrupt readers on CPU %i, " |
68f25f81 |
316 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
317 | i, |
318 | calibrate_cycles(per_cpu(int_delaymin, i)), |
319 | calibrate_cycles(per_cpu(int_delayavg, i)), |
320 | calibrate_cycles(per_cpu(int_delaymax, i))); |
7f563886 |
321 | } |
f0a36bb1 |
322 | return 0; |
323 | } |
324 | |
1c21e42c |
325 | static int trylock_interrupt_reader_thread(void *data) |
326 | { |
327 | unsigned long iter = 0; |
328 | int i; |
329 | |
330 | do { |
331 | iter++; |
332 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
333 | if (INTERRUPT_READER_DELAY) |
334 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
335 | } while (!kthread_should_stop()); |
336 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
337 | (unsigned long)data, iter); |
338 | for_each_online_cpu(i) { |
339 | printk("trylock interrupt readers on CPU %i, " |
340 | "iterations %lu, " |
341 | "successful iterations : %lu\n", |
342 | i, per_cpu(trylock_int_iter, i), |
343 | per_cpu(trylock_int_success, i)); |
68f25f81 |
344 | per_cpu(trylock_int_iter, i) = 0; |
345 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
346 | } |
347 | return 0; |
348 | } |
349 | |
f0a36bb1 |
350 | static int writer_thread(void *data) |
351 | { |
352 | int i; |
353 | int new; |
354 | unsigned long iter = 0; |
68f25f81 |
355 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
356 | delayavg = 0; |
f0a36bb1 |
357 | |
358 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
359 | do { |
360 | iter++; |
7f563886 |
361 | preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
362 | rdtsc_barrier(); |
7f563886 |
363 | time1 = get_cycles(); |
68f25f81 |
364 | rdtsc_barrier(); |
365 | |
cd7cf33d |
366 | wrap_write_lock(); |
68f25f81 |
367 | |
368 | rdtsc_barrier(); |
7f563886 |
369 | time2 = get_cycles(); |
68f25f81 |
370 | rdtsc_barrier(); |
371 | delay = time2 - time1; |
372 | delaymax = max(delaymax, delay); |
373 | delaymin = min(delaymin, delay); |
374 | delayavg += delay; |
f0a36bb1 |
375 | new = (int)get_cycles(); |
376 | for (i = 0; i < NR_VARS; i++) { |
377 | var[i] = new; |
378 | } |
cd7cf33d |
379 | |
380 | wrap_write_unlock(); |
381 | |
7f563886 |
382 | preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
383 | if (WRITER_DELAY > 0) |
4d1751f9 |
384 | udelay(WRITER_DELAY); |
f0a36bb1 |
385 | } while (!kthread_should_stop()); |
68f25f81 |
386 | delayavg /= iter; |
7f563886 |
387 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
388 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
389 | (unsigned long)data, iter, |
390 | calibrate_cycles(delaymin), |
391 | calibrate_cycles(delayavg), |
392 | calibrate_cycles(delaymax)); |
f0a36bb1 |
393 | return 0; |
394 | } |
395 | |
cd7cf33d |
396 | #if (TEST_STD_RWLOCK) |
397 | static int trylock_writer_thread(void *data) |
398 | { |
399 | int i; |
400 | int new; |
401 | unsigned long iter = 0, success = 0, fail = 0; |
402 | |
403 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
404 | do { |
405 | #if (TEST_INTERRUPTS) |
406 | /* std write trylock cannot disable interrupts. */ |
407 | local_irq_disable(); |
408 | #endif |
409 | |
410 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
411 | for (;;) { |
412 | iter++; |
413 | if (write_trylock(&std_rw_lock)) |
414 | goto locked; |
415 | } |
416 | #else |
417 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
418 | iter++; |
419 | if (write_trylock(&std_rw_lock)) |
420 | goto locked; |
421 | } |
422 | #endif |
423 | fail++; |
424 | #if (TEST_INTERRUPTS) |
425 | local_irq_enable(); |
426 | #endif |
427 | goto loop; |
428 | locked: |
429 | success++; |
430 | new = (int)get_cycles(); |
431 | for (i = 0; i < NR_VARS; i++) { |
432 | var[i] = new; |
433 | } |
434 | #if (TEST_INTERRUPTS) |
435 | write_unlock_irq(&std_rw_lock); |
436 | #else |
437 | write_unlock(&std_rw_lock); |
438 | #endif |
439 | loop: |
440 | if (TRYLOCK_WRITER_DELAY > 0) |
441 | udelay(TRYLOCK_WRITER_DELAY); |
442 | } while (!kthread_should_stop()); |
443 | printk("trylock_writer_thread/%lu iterations : " |
444 | "[try,success,fail after %d try], " |
445 | "%lu,%lu,%lu\n", |
446 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
447 | iter, success, fail); |
448 | return 0; |
449 | } |
450 | |
451 | #else /* !TEST_STD_RWLOCK */ |
452 | |
1c21e42c |
453 | static int trylock_writer_thread(void *data) |
454 | { |
455 | int i; |
456 | int new; |
4fd25765 |
457 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
458 | |
459 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
460 | do { |
4fd25765 |
461 | iter++; |
462 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
463 | if (wbias_write_trylock_irq_else_subscribe(&wbiasrwlock)) |
4fd25765 |
464 | #else |
0e0fdeb6 |
465 | if (wbias_write_trylock_else_subscribe(&wbiasrwlock)) |
4fd25765 |
466 | #endif |
467 | goto locked; |
cd7cf33d |
468 | |
4fd25765 |
469 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
470 | for (;;) { |
1c21e42c |
471 | iter++; |
4fd25765 |
472 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
473 | if (wbias_write_trylock_irq_subscribed(&wbiasrwlock)) |
4fd25765 |
474 | #else |
0e0fdeb6 |
475 | if (wbias_write_trylock_subscribed(&wbiasrwlock)) |
4fd25765 |
476 | #endif |
477 | goto locked; |
1c21e42c |
478 | } |
4fd25765 |
479 | #else |
cd7cf33d |
480 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
481 | iter++; |
482 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
483 | if (wbias_write_trylock_irq_subscribed(&wbiasrwlock)) |
4fd25765 |
484 | #else |
0e0fdeb6 |
485 | if (wbias_write_trylock_subscribed(&wbiasrwlock)) |
4fd25765 |
486 | #endif |
487 | goto locked; |
488 | } |
489 | #endif |
490 | fail++; |
0e0fdeb6 |
491 | wbias_write_unsubscribe(&wbiasrwlock); |
4fd25765 |
492 | goto loop; |
493 | locked: |
1c21e42c |
494 | success++; |
1c21e42c |
495 | new = (int)get_cycles(); |
496 | for (i = 0; i < NR_VARS; i++) { |
497 | var[i] = new; |
498 | } |
4fd25765 |
499 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
500 | wbias_write_unlock_irq(&wbiasrwlock); |
4fd25765 |
501 | #else |
0e0fdeb6 |
502 | wbias_write_unlock(&wbiasrwlock); |
4fd25765 |
503 | #endif |
504 | loop: |
505 | if (TRYLOCK_WRITER_DELAY > 0) |
506 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
507 | } while (!kthread_should_stop()); |
4fd25765 |
508 | printk("trylock_writer_thread/%lu iterations : " |
509 | "[try,success,fail after %d try], " |
510 | "%lu,%lu,%lu\n", |
511 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
512 | iter, success, fail); |
1c21e42c |
513 | return 0; |
514 | } |
515 | |
cd7cf33d |
516 | #endif /* TEST_STD_RWLOCK */ |
517 | |
0e0fdeb6 |
518 | static void wbias_rwlock_create(void) |
f0a36bb1 |
519 | { |
520 | unsigned long i; |
521 | |
522 | for (i = 0; i < NR_READERS; i++) { |
523 | printk("starting reader thread %lu\n", i); |
524 | reader_threads[i] = kthread_run(reader_thread, (void *)i, |
0e0fdeb6 |
525 | "wbiasrwlock_reader"); |
f0a36bb1 |
526 | BUG_ON(!reader_threads[i]); |
527 | } |
528 | |
1c21e42c |
529 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
530 | printk("starting trylock reader thread %lu\n", i); |
531 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
0e0fdeb6 |
532 | (void *)i, "wbiasrwlock_trylock_reader"); |
1c21e42c |
533 | BUG_ON(!trylock_reader_threads[i]); |
534 | } |
4fd25765 |
535 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
536 | printk("starting interrupt reader %lu\n", i); |
537 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
538 | (void *)i, |
0e0fdeb6 |
539 | "wbiasrwlock_interrupt_reader"); |
4fd25765 |
540 | } |
541 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
542 | printk("starting trylock interrupt reader %lu\n", i); |
543 | trylock_interrupt_reader[i] = |
544 | kthread_run(trylock_interrupt_reader_thread, |
0e0fdeb6 |
545 | (void *)i, "wbiasrwlock_trylock_interrupt_reader"); |
4fd25765 |
546 | } |
f0a36bb1 |
547 | for (i = 0; i < NR_WRITERS; i++) { |
548 | printk("starting writer thread %lu\n", i); |
549 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
0e0fdeb6 |
550 | "wbiasrwlock_writer"); |
f0a36bb1 |
551 | BUG_ON(!writer_threads[i]); |
552 | } |
1c21e42c |
553 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
554 | printk("starting trylock writer thread %lu\n", i); |
555 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
0e0fdeb6 |
556 | (void *)i, "wbiasrwlock_trylock_writer"); |
1c21e42c |
557 | BUG_ON(!trylock_writer_threads[i]); |
558 | } |
f0a36bb1 |
559 | } |
560 | |
0e0fdeb6 |
561 | static void wbias_rwlock_stop(void) |
f0a36bb1 |
562 | { |
563 | unsigned long i; |
564 | |
1c21e42c |
565 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
566 | kthread_stop(writer_threads[i]); |
1c21e42c |
567 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
568 | kthread_stop(trylock_writer_threads[i]); |
569 | for (i = 0; i < NR_READERS; i++) |
f0a36bb1 |
570 | kthread_stop(reader_threads[i]); |
1c21e42c |
571 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
572 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
573 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
574 | kthread_stop(interrupt_reader[i]); |
575 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
576 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
577 | } |
578 | |
579 | |
580 | static void perform_test(const char *name, void (*callback)(void)) |
581 | { |
582 | printk("%s\n", name); |
583 | callback(); |
584 | } |
585 | |
586 | static int my_open(struct inode *inode, struct file *file) |
587 | { |
68f25f81 |
588 | unsigned long i; |
589 | cycles_t time1, time2, delay; |
590 | |
591 | printk("** get_cycles calibration **\n"); |
592 | cycles_calibration_min = ULLONG_MAX; |
593 | cycles_calibration_avg = 0; |
594 | cycles_calibration_max = 0; |
595 | |
596 | local_irq_disable(); |
597 | for (i = 0; i < 10; i++) { |
598 | rdtsc_barrier(); |
599 | time1 = get_cycles(); |
600 | rdtsc_barrier(); |
601 | rdtsc_barrier(); |
602 | time2 = get_cycles(); |
603 | rdtsc_barrier(); |
604 | delay = time2 - time1; |
605 | cycles_calibration_min = min(cycles_calibration_min, delay); |
606 | cycles_calibration_avg += delay; |
607 | cycles_calibration_max = max(cycles_calibration_max, delay); |
608 | } |
609 | cycles_calibration_avg /= 10; |
610 | local_irq_enable(); |
611 | |
612 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
613 | "results calibrated on avg\n", |
614 | cycles_calibration_min, |
615 | cycles_calibration_avg, |
616 | cycles_calibration_max); |
617 | |
618 | printk("** Single writer test, no contention **\n"); |
619 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
620 | "wbiasrwlock_writer"); |
68f25f81 |
621 | BUG_ON(!writer_threads[0]); |
622 | ssleep(SINGLE_WRITER_TEST_DURATION); |
623 | kthread_stop(writer_threads[0]); |
624 | |
4fd25765 |
625 | printk("** Single trylock writer test, no contention **\n"); |
626 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
627 | (void *)0, |
0e0fdeb6 |
628 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
629 | BUG_ON(!trylock_writer_threads[0]); |
630 | ssleep(SINGLE_WRITER_TEST_DURATION); |
631 | kthread_stop(trylock_writer_threads[0]); |
632 | |
68f25f81 |
633 | printk("** Single reader test, no contention **\n"); |
634 | reader_threads[0] = kthread_run(reader_thread, (void *)0, |
0e0fdeb6 |
635 | "wbiasrwlock_reader"); |
68f25f81 |
636 | BUG_ON(!reader_threads[0]); |
637 | ssleep(SINGLE_READER_TEST_DURATION); |
638 | kthread_stop(reader_threads[0]); |
639 | |
640 | printk("** Multiple readers test, no contention **\n"); |
641 | for (i = 0; i < NR_READERS; i++) { |
642 | printk("starting reader thread %lu\n", i); |
643 | reader_threads[i] = kthread_run(reader_thread, (void *)i, |
0e0fdeb6 |
644 | "wbiasrwlock_reader"); |
68f25f81 |
645 | BUG_ON(!reader_threads[i]); |
646 | } |
647 | ssleep(SINGLE_READER_TEST_DURATION); |
648 | for (i = 0; i < NR_READERS; i++) |
649 | kthread_stop(reader_threads[i]); |
650 | |
651 | printk("** High contention test **\n"); |
0e0fdeb6 |
652 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
653 | ssleep(TEST_DURATION); |
0e0fdeb6 |
654 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
f0a36bb1 |
655 | |
656 | return -EPERM; |
657 | } |
658 | |
659 | |
660 | static struct file_operations my_operations = { |
661 | .open = my_open, |
662 | }; |
663 | |
664 | int init_module(void) |
665 | { |
0e0fdeb6 |
666 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
667 | if (pentry) |
668 | pentry->proc_fops = &my_operations; |
669 | |
ca935c46 |
670 | printk("pow2cpus : %lu\n", pow2cpus); |
f0a36bb1 |
671 | printk("THREAD_ROFFSET : %lX\n", THREAD_ROFFSET); |
672 | printk("THREAD_RMASK : %lX\n", THREAD_RMASK); |
f0a36bb1 |
673 | printk("SOFTIRQ_ROFFSET : %lX\n", SOFTIRQ_ROFFSET); |
674 | printk("SOFTIRQ_RMASK : %lX\n", SOFTIRQ_RMASK); |
f0a36bb1 |
675 | printk("HARDIRQ_ROFFSET : %lX\n", HARDIRQ_ROFFSET); |
676 | printk("HARDIRQ_RMASK : %lX\n", HARDIRQ_RMASK); |
7f563886 |
677 | printk("SUBSCRIBERS_WOFFSET : %lX\n", SUBSCRIBERS_WOFFSET); |
678 | printk("SUBSCRIBERS_WMASK : %lX\n", SUBSCRIBERS_WMASK); |
679 | printk("WRITER_MUTEX : %lX\n", WRITER_MUTEX); |
680 | printk("SOFTIRQ_WMASK : %lX\n", SOFTIRQ_WMASK); |
f0a36bb1 |
681 | printk("HARDIRQ_WMASK : %lX\n", HARDIRQ_WMASK); |
682 | |
683 | return 0; |
684 | } |
685 | |
686 | void cleanup_module(void) |
687 | { |
0e0fdeb6 |
688 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
689 | } |
690 | |
691 | MODULE_LICENSE("GPL"); |
692 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
693 | MODULE_DESCRIPTION("wbias rwlock test"); |