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> |
cd7cf33d |
15 | #include <linux/spinlock.h> |
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16 | #include <asm/ptrace.h> |
17 | |
7f563886 |
18 | #if (NR_CPUS > 64 && (BITS_PER_LONG == 32 || NR_CPUS > 32768)) |
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19 | #error "writer-biased rwlock needs more bits per long to deal with so many CPUs" |
f0a36bb1 |
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 |
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29 | |
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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 |
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41 | * 0 : test wbiasrwlock |
cd7cf33d |
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 |
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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 | |
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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]; |
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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 | |
0e0fdeb6 |
106 | static DEFINE_WBIAS_RWLOCK(wbiasrwlock); |
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107 | |
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108 | #define wrap_read_lock() wbias_read_lock(&wbiasrwlock) |
109 | #define wrap_read_trylock() wbias_read_trylock(&wbiasrwlock) |
110 | #define wrap_read_unlock() wbias_read_unlock(&wbiasrwlock) |
cd7cf33d |
111 | |
0e0fdeb6 |
112 | #define wrap_read_lock_irq() wbias_read_lock_irq(&wbiasrwlock) |
113 | #define wrap_read_trylock_irq() wbias_read_trylock_irq(&wbiasrwlock) |
114 | #define wrap_read_unlock_irq() wbias_read_unlock_irq(&wbiasrwlock) |
cd7cf33d |
115 | |
116 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
117 | #define wrap_write_lock() wbias_write_lock_irq(&wbiasrwlock) |
118 | #define wrap_write_unlock() wbias_write_unlock_irq(&wbiasrwlock) |
cd7cf33d |
119 | #else |
0e0fdeb6 |
120 | #define wrap_write_lock() wbias_write_lock(&wbiasrwlock) |
121 | #define wrap_write_unlock() wbias_write_unlock(&wbiasrwlock) |
cd7cf33d |
122 | #endif |
123 | |
124 | #endif |
125 | |
68f25f81 |
126 | static cycles_t cycles_calibration_min, |
127 | cycles_calibration_avg, |
128 | cycles_calibration_max; |
129 | |
130 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
131 | { |
132 | return cycles - cycles_calibration_avg; |
133 | } |
134 | |
f0a36bb1 |
135 | struct proc_dir_entry *pentry = NULL; |
136 | |
137 | static int reader_thread(void *data) |
138 | { |
139 | int i; |
140 | int prev, cur; |
141 | unsigned long iter = 0; |
68f25f81 |
142 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
143 | delayavg = 0; |
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144 | |
145 | printk("reader_thread/%lu runnning\n", (unsigned long)data); |
146 | do { |
147 | iter++; |
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148 | preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
149 | rdtsc_barrier(); |
7f563886 |
150 | time1 = get_cycles(); |
68f25f81 |
151 | rdtsc_barrier(); |
152 | |
cd7cf33d |
153 | wrap_read_lock(); |
68f25f81 |
154 | |
155 | rdtsc_barrier(); |
7f563886 |
156 | time2 = get_cycles(); |
68f25f81 |
157 | rdtsc_barrier(); |
158 | delay = time2 - time1; |
159 | delaymax = max(delaymax, delay); |
160 | delaymin = min(delaymin, delay); |
161 | delayavg += delay; |
f0a36bb1 |
162 | prev = var[0]; |
163 | for (i = 1; i < NR_VARS; i++) { |
164 | cur = var[i]; |
165 | if (cur != prev) |
166 | printk(KERN_ALERT |
167 | "Unequal cur %d/prev %d at i %d, iter %lu " |
168 | "in thread\n", cur, prev, i, iter); |
169 | } |
cd7cf33d |
170 | |
171 | wrap_read_unlock(); |
172 | |
7f563886 |
173 | preempt_enable(); /* for get_cycles accuracy */ |
4fd25765 |
174 | if (THREAD_READER_DELAY) |
175 | msleep(THREAD_READER_DELAY); |
f0a36bb1 |
176 | } while (!kthread_should_stop()); |
4fd25765 |
177 | if (!iter) { |
178 | printk("reader_thread/%lu iterations : %lu", |
179 | (unsigned long)data, iter); |
180 | } else { |
181 | delayavg /= iter; |
182 | printk("reader_thread/%lu iterations : %lu, " |
183 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
184 | (unsigned long)data, iter, |
185 | calibrate_cycles(delaymin), |
186 | calibrate_cycles(delayavg), |
187 | calibrate_cycles(delaymax)); |
188 | } |
f0a36bb1 |
189 | return 0; |
190 | } |
191 | |
1c21e42c |
192 | static int trylock_reader_thread(void *data) |
193 | { |
194 | int i; |
195 | int prev, cur; |
196 | unsigned long iter = 0, success_iter = 0; |
197 | |
198 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
199 | do { |
cd7cf33d |
200 | while (!wrap_read_trylock()) |
1c21e42c |
201 | iter++; |
202 | success_iter++; |
203 | prev = var[0]; |
204 | for (i = 1; i < NR_VARS; i++) { |
205 | cur = var[i]; |
206 | if (cur != prev) |
207 | printk(KERN_ALERT |
208 | "Unequal cur %d/prev %d at i %d, iter %lu " |
209 | "in thread\n", cur, prev, i, iter); |
210 | } |
cd7cf33d |
211 | wrap_read_unlock(); |
4fd25765 |
212 | if (THREAD_READER_DELAY) |
213 | msleep(THREAD_READER_DELAY); |
1c21e42c |
214 | } while (!kthread_should_stop()); |
215 | printk("trylock_reader_thread/%lu iterations : %lu, " |
216 | "successful iterations : %lu\n", |
217 | (unsigned long)data, iter, success_iter); |
218 | return 0; |
219 | } |
220 | |
68f25f81 |
221 | DEFINE_PER_CPU(cycles_t, int_delaymin); |
222 | DEFINE_PER_CPU(cycles_t, int_delayavg); |
7f563886 |
223 | DEFINE_PER_CPU(cycles_t, int_delaymax); |
68f25f81 |
224 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
225 | |
f0a36bb1 |
226 | static void interrupt_reader_ipi(void *data) |
227 | { |
228 | int i; |
229 | int prev, cur; |
7f563886 |
230 | cycles_t time1, time2; |
68f25f81 |
231 | cycles_t *delaymax, *delaymin, *delayavg, *ipi_nr, delay; |
7f563886 |
232 | |
233 | /* |
234 | * Skip the ipi caller, not in irq context. |
235 | */ |
236 | if (!in_irq()) |
237 | return; |
f0a36bb1 |
238 | |
7f563886 |
239 | delaymax = &per_cpu(int_delaymax, smp_processor_id()); |
68f25f81 |
240 | delaymin = &per_cpu(int_delaymin, smp_processor_id()); |
241 | delayavg = &per_cpu(int_delayavg, smp_processor_id()); |
242 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
243 | |
244 | rdtsc_barrier(); |
7f563886 |
245 | time1 = get_cycles(); |
68f25f81 |
246 | rdtsc_barrier(); |
247 | |
cd7cf33d |
248 | wrap_read_lock_irq(); |
68f25f81 |
249 | |
250 | rdtsc_barrier(); |
7f563886 |
251 | time2 = get_cycles(); |
68f25f81 |
252 | rdtsc_barrier(); |
253 | delay = time2 - time1; |
254 | *delaymax = max(*delaymax, delay); |
255 | *delaymin = min(*delaymin, delay); |
256 | *delayavg += delay; |
257 | (*ipi_nr)++; |
f0a36bb1 |
258 | prev = var[0]; |
259 | for (i = 1; i < NR_VARS; i++) { |
260 | cur = var[i]; |
261 | if (cur != prev) |
262 | printk(KERN_ALERT |
263 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
264 | cur, prev, i); |
265 | } |
cd7cf33d |
266 | wrap_read_unlock_irq(); |
f0a36bb1 |
267 | } |
268 | |
1c21e42c |
269 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
270 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
271 | |
272 | static void trylock_interrupt_reader_ipi(void *data) |
273 | { |
274 | int i; |
275 | int prev, cur; |
276 | |
277 | /* |
278 | * Skip the ipi caller, not in irq context. |
279 | */ |
280 | if (!in_irq()) |
281 | return; |
282 | |
283 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
284 | while (!wrap_read_trylock_irq()) |
1c21e42c |
285 | per_cpu(trylock_int_iter, smp_processor_id())++; |
286 | per_cpu(trylock_int_success, smp_processor_id())++; |
287 | prev = var[0]; |
288 | for (i = 1; i < NR_VARS; i++) { |
289 | cur = var[i]; |
290 | if (cur != prev) |
291 | printk(KERN_ALERT |
292 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
293 | cur, prev, i); |
294 | } |
cd7cf33d |
295 | wrap_read_unlock_irq(); |
1c21e42c |
296 | } |
297 | |
298 | |
f0a36bb1 |
299 | static int interrupt_reader_thread(void *data) |
300 | { |
301 | unsigned long iter = 0; |
7f563886 |
302 | int i; |
303 | |
68f25f81 |
304 | for_each_online_cpu(i) { |
305 | per_cpu(int_delaymax, i) = 0; |
306 | per_cpu(int_delaymin, i) = ULLONG_MAX; |
307 | per_cpu(int_delayavg, i) = 0; |
308 | per_cpu(int_ipi_nr, i) = 0; |
309 | } |
f0a36bb1 |
310 | do { |
311 | iter++; |
312 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
313 | if (INTERRUPT_READER_DELAY) |
314 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
315 | } while (!kthread_should_stop()); |
316 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
317 | (unsigned long)data, iter); |
7f563886 |
318 | for_each_online_cpu(i) { |
4fd25765 |
319 | if (!per_cpu(int_ipi_nr, i)) |
320 | continue; |
68f25f81 |
321 | per_cpu(int_delayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
322 | printk("interrupt readers on CPU %i, " |
68f25f81 |
323 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
324 | i, |
325 | calibrate_cycles(per_cpu(int_delaymin, i)), |
326 | calibrate_cycles(per_cpu(int_delayavg, i)), |
327 | calibrate_cycles(per_cpu(int_delaymax, i))); |
7f563886 |
328 | } |
f0a36bb1 |
329 | return 0; |
330 | } |
331 | |
1c21e42c |
332 | static int trylock_interrupt_reader_thread(void *data) |
333 | { |
334 | unsigned long iter = 0; |
335 | int i; |
336 | |
337 | do { |
338 | iter++; |
339 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
340 | if (INTERRUPT_READER_DELAY) |
341 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
342 | } while (!kthread_should_stop()); |
343 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
344 | (unsigned long)data, iter); |
345 | for_each_online_cpu(i) { |
346 | printk("trylock interrupt readers on CPU %i, " |
347 | "iterations %lu, " |
348 | "successful iterations : %lu\n", |
349 | i, per_cpu(trylock_int_iter, i), |
350 | per_cpu(trylock_int_success, i)); |
68f25f81 |
351 | per_cpu(trylock_int_iter, i) = 0; |
352 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
353 | } |
354 | return 0; |
355 | } |
356 | |
f0a36bb1 |
357 | static int writer_thread(void *data) |
358 | { |
359 | int i; |
360 | int new; |
361 | unsigned long iter = 0; |
68f25f81 |
362 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
363 | delayavg = 0; |
f0a36bb1 |
364 | |
365 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
366 | do { |
367 | iter++; |
7f563886 |
368 | preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
369 | rdtsc_barrier(); |
7f563886 |
370 | time1 = get_cycles(); |
68f25f81 |
371 | rdtsc_barrier(); |
372 | |
cd7cf33d |
373 | wrap_write_lock(); |
68f25f81 |
374 | |
375 | rdtsc_barrier(); |
7f563886 |
376 | time2 = get_cycles(); |
68f25f81 |
377 | rdtsc_barrier(); |
378 | delay = time2 - time1; |
379 | delaymax = max(delaymax, delay); |
380 | delaymin = min(delaymin, delay); |
381 | delayavg += delay; |
f0a36bb1 |
382 | new = (int)get_cycles(); |
383 | for (i = 0; i < NR_VARS; i++) { |
384 | var[i] = new; |
385 | } |
cd7cf33d |
386 | |
387 | wrap_write_unlock(); |
388 | |
7f563886 |
389 | preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
390 | if (WRITER_DELAY > 0) |
4d1751f9 |
391 | udelay(WRITER_DELAY); |
f0a36bb1 |
392 | } while (!kthread_should_stop()); |
68f25f81 |
393 | delayavg /= iter; |
7f563886 |
394 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
395 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
396 | (unsigned long)data, iter, |
397 | calibrate_cycles(delaymin), |
398 | calibrate_cycles(delayavg), |
399 | calibrate_cycles(delaymax)); |
f0a36bb1 |
400 | return 0; |
401 | } |
402 | |
cd7cf33d |
403 | #if (TEST_STD_RWLOCK) |
404 | static int trylock_writer_thread(void *data) |
405 | { |
406 | int i; |
407 | int new; |
408 | unsigned long iter = 0, success = 0, fail = 0; |
409 | |
410 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
411 | do { |
412 | #if (TEST_INTERRUPTS) |
413 | /* std write trylock cannot disable interrupts. */ |
414 | local_irq_disable(); |
415 | #endif |
416 | |
417 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
418 | for (;;) { |
419 | iter++; |
420 | if (write_trylock(&std_rw_lock)) |
421 | goto locked; |
422 | } |
423 | #else |
424 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
425 | iter++; |
426 | if (write_trylock(&std_rw_lock)) |
427 | goto locked; |
428 | } |
429 | #endif |
430 | fail++; |
431 | #if (TEST_INTERRUPTS) |
432 | local_irq_enable(); |
433 | #endif |
434 | goto loop; |
435 | locked: |
436 | success++; |
437 | new = (int)get_cycles(); |
438 | for (i = 0; i < NR_VARS; i++) { |
439 | var[i] = new; |
440 | } |
441 | #if (TEST_INTERRUPTS) |
442 | write_unlock_irq(&std_rw_lock); |
443 | #else |
444 | write_unlock(&std_rw_lock); |
445 | #endif |
446 | loop: |
447 | if (TRYLOCK_WRITER_DELAY > 0) |
448 | udelay(TRYLOCK_WRITER_DELAY); |
449 | } while (!kthread_should_stop()); |
450 | printk("trylock_writer_thread/%lu iterations : " |
451 | "[try,success,fail after %d try], " |
452 | "%lu,%lu,%lu\n", |
453 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
454 | iter, success, fail); |
455 | return 0; |
456 | } |
457 | |
458 | #else /* !TEST_STD_RWLOCK */ |
459 | |
1c21e42c |
460 | static int trylock_writer_thread(void *data) |
461 | { |
462 | int i; |
463 | int new; |
4fd25765 |
464 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
465 | |
466 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
467 | do { |
4fd25765 |
468 | iter++; |
469 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
470 | if (wbias_write_trylock_irq_else_subscribe(&wbiasrwlock)) |
4fd25765 |
471 | #else |
0e0fdeb6 |
472 | if (wbias_write_trylock_else_subscribe(&wbiasrwlock)) |
4fd25765 |
473 | #endif |
474 | goto locked; |
cd7cf33d |
475 | |
4fd25765 |
476 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
477 | for (;;) { |
1c21e42c |
478 | iter++; |
4fd25765 |
479 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
480 | if (wbias_write_trylock_irq_subscribed(&wbiasrwlock)) |
4fd25765 |
481 | #else |
0e0fdeb6 |
482 | if (wbias_write_trylock_subscribed(&wbiasrwlock)) |
4fd25765 |
483 | #endif |
484 | goto locked; |
1c21e42c |
485 | } |
4fd25765 |
486 | #else |
cd7cf33d |
487 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
488 | iter++; |
489 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
490 | if (wbias_write_trylock_irq_subscribed(&wbiasrwlock)) |
4fd25765 |
491 | #else |
0e0fdeb6 |
492 | if (wbias_write_trylock_subscribed(&wbiasrwlock)) |
4fd25765 |
493 | #endif |
494 | goto locked; |
495 | } |
496 | #endif |
497 | fail++; |
0e0fdeb6 |
498 | wbias_write_unsubscribe(&wbiasrwlock); |
4fd25765 |
499 | goto loop; |
500 | locked: |
1c21e42c |
501 | success++; |
1c21e42c |
502 | new = (int)get_cycles(); |
503 | for (i = 0; i < NR_VARS; i++) { |
504 | var[i] = new; |
505 | } |
4fd25765 |
506 | #if (TEST_INTERRUPTS) |
0e0fdeb6 |
507 | wbias_write_unlock_irq(&wbiasrwlock); |
4fd25765 |
508 | #else |
0e0fdeb6 |
509 | wbias_write_unlock(&wbiasrwlock); |
4fd25765 |
510 | #endif |
511 | loop: |
512 | if (TRYLOCK_WRITER_DELAY > 0) |
513 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
514 | } while (!kthread_should_stop()); |
4fd25765 |
515 | printk("trylock_writer_thread/%lu iterations : " |
516 | "[try,success,fail after %d try], " |
517 | "%lu,%lu,%lu\n", |
518 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
519 | iter, success, fail); |
1c21e42c |
520 | return 0; |
521 | } |
522 | |
cd7cf33d |
523 | #endif /* TEST_STD_RWLOCK */ |
524 | |
0e0fdeb6 |
525 | static void wbias_rwlock_create(void) |
f0a36bb1 |
526 | { |
527 | unsigned long i; |
528 | |
529 | for (i = 0; i < NR_READERS; i++) { |
530 | printk("starting reader thread %lu\n", i); |
531 | reader_threads[i] = kthread_run(reader_thread, (void *)i, |
0e0fdeb6 |
532 | "wbiasrwlock_reader"); |
f0a36bb1 |
533 | BUG_ON(!reader_threads[i]); |
534 | } |
535 | |
1c21e42c |
536 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
537 | printk("starting trylock reader thread %lu\n", i); |
538 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
0e0fdeb6 |
539 | (void *)i, "wbiasrwlock_trylock_reader"); |
1c21e42c |
540 | BUG_ON(!trylock_reader_threads[i]); |
541 | } |
4fd25765 |
542 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
543 | printk("starting interrupt reader %lu\n", i); |
544 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
545 | (void *)i, |
0e0fdeb6 |
546 | "wbiasrwlock_interrupt_reader"); |
4fd25765 |
547 | } |
548 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
549 | printk("starting trylock interrupt reader %lu\n", i); |
550 | trylock_interrupt_reader[i] = |
551 | kthread_run(trylock_interrupt_reader_thread, |
0e0fdeb6 |
552 | (void *)i, "wbiasrwlock_trylock_interrupt_reader"); |
4fd25765 |
553 | } |
f0a36bb1 |
554 | for (i = 0; i < NR_WRITERS; i++) { |
555 | printk("starting writer thread %lu\n", i); |
556 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
0e0fdeb6 |
557 | "wbiasrwlock_writer"); |
f0a36bb1 |
558 | BUG_ON(!writer_threads[i]); |
559 | } |
1c21e42c |
560 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
561 | printk("starting trylock writer thread %lu\n", i); |
562 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
0e0fdeb6 |
563 | (void *)i, "wbiasrwlock_trylock_writer"); |
1c21e42c |
564 | BUG_ON(!trylock_writer_threads[i]); |
565 | } |
f0a36bb1 |
566 | } |
567 | |
0e0fdeb6 |
568 | static void wbias_rwlock_stop(void) |
f0a36bb1 |
569 | { |
570 | unsigned long i; |
571 | |
1c21e42c |
572 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
573 | kthread_stop(writer_threads[i]); |
1c21e42c |
574 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
575 | kthread_stop(trylock_writer_threads[i]); |
576 | for (i = 0; i < NR_READERS; i++) |
f0a36bb1 |
577 | kthread_stop(reader_threads[i]); |
1c21e42c |
578 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
579 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
580 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
581 | kthread_stop(interrupt_reader[i]); |
582 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
583 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
584 | } |
585 | |
586 | |
587 | static void perform_test(const char *name, void (*callback)(void)) |
588 | { |
589 | printk("%s\n", name); |
590 | callback(); |
591 | } |
592 | |
593 | static int my_open(struct inode *inode, struct file *file) |
594 | { |
68f25f81 |
595 | unsigned long i; |
596 | cycles_t time1, time2, delay; |
597 | |
598 | printk("** get_cycles calibration **\n"); |
599 | cycles_calibration_min = ULLONG_MAX; |
600 | cycles_calibration_avg = 0; |
601 | cycles_calibration_max = 0; |
602 | |
603 | local_irq_disable(); |
604 | for (i = 0; i < 10; i++) { |
605 | rdtsc_barrier(); |
606 | time1 = get_cycles(); |
607 | rdtsc_barrier(); |
608 | rdtsc_barrier(); |
609 | time2 = get_cycles(); |
610 | rdtsc_barrier(); |
611 | delay = time2 - time1; |
612 | cycles_calibration_min = min(cycles_calibration_min, delay); |
613 | cycles_calibration_avg += delay; |
614 | cycles_calibration_max = max(cycles_calibration_max, delay); |
615 | } |
616 | cycles_calibration_avg /= 10; |
617 | local_irq_enable(); |
618 | |
619 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
620 | "results calibrated on avg\n", |
621 | cycles_calibration_min, |
622 | cycles_calibration_avg, |
623 | cycles_calibration_max); |
624 | |
625 | printk("** Single writer test, no contention **\n"); |
626 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
627 | "wbiasrwlock_writer"); |
68f25f81 |
628 | BUG_ON(!writer_threads[0]); |
629 | ssleep(SINGLE_WRITER_TEST_DURATION); |
630 | kthread_stop(writer_threads[0]); |
631 | |
4fd25765 |
632 | printk("** Single trylock writer test, no contention **\n"); |
633 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
634 | (void *)0, |
0e0fdeb6 |
635 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
636 | BUG_ON(!trylock_writer_threads[0]); |
637 | ssleep(SINGLE_WRITER_TEST_DURATION); |
638 | kthread_stop(trylock_writer_threads[0]); |
639 | |
68f25f81 |
640 | printk("** Single reader test, no contention **\n"); |
641 | reader_threads[0] = kthread_run(reader_thread, (void *)0, |
0e0fdeb6 |
642 | "wbiasrwlock_reader"); |
68f25f81 |
643 | BUG_ON(!reader_threads[0]); |
644 | ssleep(SINGLE_READER_TEST_DURATION); |
645 | kthread_stop(reader_threads[0]); |
646 | |
647 | printk("** Multiple readers test, no contention **\n"); |
648 | for (i = 0; i < NR_READERS; i++) { |
649 | printk("starting reader thread %lu\n", i); |
650 | reader_threads[i] = kthread_run(reader_thread, (void *)i, |
0e0fdeb6 |
651 | "wbiasrwlock_reader"); |
68f25f81 |
652 | BUG_ON(!reader_threads[i]); |
653 | } |
654 | ssleep(SINGLE_READER_TEST_DURATION); |
655 | for (i = 0; i < NR_READERS; i++) |
656 | kthread_stop(reader_threads[i]); |
657 | |
658 | printk("** High contention test **\n"); |
0e0fdeb6 |
659 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
660 | ssleep(TEST_DURATION); |
0e0fdeb6 |
661 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
f0a36bb1 |
662 | |
663 | return -EPERM; |
664 | } |
665 | |
666 | |
667 | static struct file_operations my_operations = { |
668 | .open = my_open, |
669 | }; |
670 | |
671 | int init_module(void) |
672 | { |
0e0fdeb6 |
673 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
674 | if (pentry) |
675 | pentry->proc_fops = &my_operations; |
676 | |
677 | printk("NR_CPUS : %d\n", NR_CPUS); |
678 | printk("THREAD_ROFFSET : %lX\n", THREAD_ROFFSET); |
679 | printk("THREAD_RMASK : %lX\n", THREAD_RMASK); |
f0a36bb1 |
680 | printk("SOFTIRQ_ROFFSET : %lX\n", SOFTIRQ_ROFFSET); |
681 | printk("SOFTIRQ_RMASK : %lX\n", SOFTIRQ_RMASK); |
f0a36bb1 |
682 | printk("HARDIRQ_ROFFSET : %lX\n", HARDIRQ_ROFFSET); |
683 | printk("HARDIRQ_RMASK : %lX\n", HARDIRQ_RMASK); |
7f563886 |
684 | printk("SUBSCRIBERS_WOFFSET : %lX\n", SUBSCRIBERS_WOFFSET); |
685 | printk("SUBSCRIBERS_WMASK : %lX\n", SUBSCRIBERS_WMASK); |
686 | printk("WRITER_MUTEX : %lX\n", WRITER_MUTEX); |
687 | printk("SOFTIRQ_WMASK : %lX\n", SOFTIRQ_WMASK); |
f0a36bb1 |
688 | printk("HARDIRQ_WMASK : %lX\n", HARDIRQ_WMASK); |
689 | |
690 | return 0; |
691 | } |
692 | |
693 | void cleanup_module(void) |
694 | { |
0e0fdeb6 |
695 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
696 | } |
697 | |
698 | MODULE_LICENSE("GPL"); |
699 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
700 | MODULE_DESCRIPTION("wbias rwlock test"); |