f0a36bb1 |
1 | /* test-fair-rwlock.c |
2 | * |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/proc_fs.h> |
7 | #include <linux/sched.h> |
8 | #include <linux/timex.h> |
9 | #include <linux/fair-rwlock.h> |
10 | #include <linux/kthread.h> |
11 | #include <linux/delay.h> |
12 | #include <linux/hardirq.h> |
13 | #include <linux/module.h> |
7f563886 |
14 | #include <linux/percpu.h> |
f0a36bb1 |
15 | #include <asm/ptrace.h> |
16 | |
7f563886 |
17 | #if (NR_CPUS > 64 && (BITS_PER_LONG == 32 || NR_CPUS > 32768)) |
f0a36bb1 |
18 | #error "fair rwlock needs more bits per long to deal with that many CPUs" |
19 | #endif |
20 | |
68f25f81 |
21 | /* Test with no contention duration, in seconds */ |
22 | #define SINGLE_WRITER_TEST_DURATION 10 |
23 | #define SINGLE_READER_TEST_DURATION 10 |
24 | #define MULTIPLE_READERS_TEST_DURATION 10 |
25 | |
89889f86 |
26 | /* Test duration, in seconds */ |
f36c4112 |
27 | #define TEST_DURATION 60 |
89889f86 |
28 | |
f0a36bb1 |
29 | #define THREAD_ROFFSET 1UL |
30 | #define THREAD_RMASK ((NR_CPUS - 1) * THREAD_ROFFSET) |
31 | #define SOFTIRQ_ROFFSET (THREAD_RMASK + 1) |
32 | #define SOFTIRQ_RMASK ((NR_CPUS - 1) * SOFTIRQ_ROFFSET) |
33 | #define HARDIRQ_ROFFSET ((SOFTIRQ_RMASK | THREAD_RMASK) + 1) |
34 | #define HARDIRQ_RMASK ((NR_CPUS - 1) * HARDIRQ_ROFFSET) |
35 | |
7f563886 |
36 | #define SUBSCRIBERS_WOFFSET \ |
37 | ((HARDIRQ_RMASK | SOFTIRQ_RMASK | THREAD_RMASK) + 1) |
38 | #define SUBSCRIBERS_WMASK \ |
39 | ((NR_CPUS - 1) * SUBSCRIBERS_WOFFSET) |
40 | #define WRITER_MUTEX \ |
41 | ((SUBSCRIBERS_WMASK | HARDIRQ_RMASK | SOFTIRQ_RMASK | THREAD_RMASK) + 1) |
42 | #define SOFTIRQ_WMASK (WRITER_MUTEX << 1) |
43 | #define SOFTIRQ_WOFFSET SOFTIRQ_WMASK |
426d6b67 |
44 | #define HARDIRQ_WMASK (SOFTIRQ_WMASK << 1) |
7f563886 |
45 | #define HARDIRQ_WOFFSET HARDIRQ_WMASK |
f0a36bb1 |
46 | |
47 | #define NR_VARS 100 |
1c21e42c |
48 | #define NR_WRITERS 2 |
49 | #define NR_TRYLOCK_WRITERS 2 |
50 | #define NR_READERS 4 |
51 | #define NR_TRYLOCK_READERS 2 |
4fd25765 |
52 | |
53 | /* |
54 | * 1 : test with thread and interrupt readers. |
55 | * 0 : test only with thread readers. |
56 | */ |
57 | #define TEST_INTERRUPTS 1 |
58 | |
59 | #if (TEST_INTERRUPTS) |
1c21e42c |
60 | #define NR_INTERRUPT_READERS 1 |
61 | #define NR_TRYLOCK_INTERRUPT_READERS 1 |
4fd25765 |
62 | #else |
63 | #define NR_INTERRUPT_READERS 0 |
64 | #define NR_TRYLOCK_INTERRUPT_READERS 0 |
65 | #endif |
f0a36bb1 |
66 | |
4d1751f9 |
67 | /* |
68 | * Writer iteration delay, in us. 0 for busy loop. Caution : writers can |
69 | * starve readers. |
70 | */ |
71 | #define WRITER_DELAY 10 |
4fd25765 |
72 | #define TRYLOCK_WRITER_DELAY 1000 |
73 | |
74 | /* |
75 | * Number of iterations after which a trylock writer fails. |
76 | * -1 for infinite loop. |
77 | */ |
78 | #define TRYLOCK_WRITERS_FAIL_ITER 100 |
79 | |
80 | /* Thread and interrupt reader delay, in ms */ |
81 | #define THREAD_READER_DELAY 0 /* busy loop */ |
82 | #define INTERRUPT_READER_DELAY 100 |
89889f86 |
83 | |
f0a36bb1 |
84 | static int var[NR_VARS]; |
85 | static struct task_struct *reader_threads[NR_READERS]; |
1c21e42c |
86 | static struct task_struct *trylock_reader_threads[NR_TRYLOCK_READERS]; |
f0a36bb1 |
87 | static struct task_struct *writer_threads[NR_WRITERS]; |
1c21e42c |
88 | static struct task_struct *trylock_writer_threads[NR_TRYLOCK_WRITERS]; |
4fd25765 |
89 | static struct task_struct *interrupt_reader[NR_INTERRUPT_READERS]; |
90 | static struct task_struct *trylock_interrupt_reader[NR_TRYLOCK_INTERRUPT_READERS]; |
f0a36bb1 |
91 | |
92 | static struct fair_rwlock frwlock = { |
93 | .value = ATOMIC_LONG_INIT(0), |
f0a36bb1 |
94 | }; |
95 | |
68f25f81 |
96 | static cycles_t cycles_calibration_min, |
97 | cycles_calibration_avg, |
98 | cycles_calibration_max; |
99 | |
100 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
101 | { |
102 | return cycles - cycles_calibration_avg; |
103 | } |
104 | |
f0a36bb1 |
105 | struct proc_dir_entry *pentry = NULL; |
106 | |
107 | static int reader_thread(void *data) |
108 | { |
109 | int i; |
110 | int prev, cur; |
111 | unsigned long iter = 0; |
68f25f81 |
112 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
113 | delayavg = 0; |
f0a36bb1 |
114 | |
115 | printk("reader_thread/%lu runnning\n", (unsigned long)data); |
116 | do { |
117 | iter++; |
7f563886 |
118 | preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
119 | rdtsc_barrier(); |
7f563886 |
120 | time1 = get_cycles(); |
68f25f81 |
121 | rdtsc_barrier(); |
122 | |
f0a36bb1 |
123 | fair_read_lock(&frwlock); |
68f25f81 |
124 | |
125 | rdtsc_barrier(); |
7f563886 |
126 | time2 = get_cycles(); |
68f25f81 |
127 | rdtsc_barrier(); |
128 | delay = time2 - time1; |
129 | delaymax = max(delaymax, delay); |
130 | delaymin = min(delaymin, delay); |
131 | delayavg += delay; |
f0a36bb1 |
132 | prev = var[0]; |
133 | for (i = 1; i < NR_VARS; i++) { |
134 | cur = var[i]; |
135 | if (cur != prev) |
136 | printk(KERN_ALERT |
137 | "Unequal cur %d/prev %d at i %d, iter %lu " |
138 | "in thread\n", cur, prev, i, iter); |
139 | } |
140 | fair_read_unlock(&frwlock); |
7f563886 |
141 | preempt_enable(); /* for get_cycles accuracy */ |
4fd25765 |
142 | if (THREAD_READER_DELAY) |
143 | msleep(THREAD_READER_DELAY); |
f0a36bb1 |
144 | } while (!kthread_should_stop()); |
4fd25765 |
145 | if (!iter) { |
146 | printk("reader_thread/%lu iterations : %lu", |
147 | (unsigned long)data, iter); |
148 | } else { |
149 | delayavg /= iter; |
150 | printk("reader_thread/%lu iterations : %lu, " |
151 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
152 | (unsigned long)data, iter, |
153 | calibrate_cycles(delaymin), |
154 | calibrate_cycles(delayavg), |
155 | calibrate_cycles(delaymax)); |
156 | } |
f0a36bb1 |
157 | return 0; |
158 | } |
159 | |
1c21e42c |
160 | static int trylock_reader_thread(void *data) |
161 | { |
162 | int i; |
163 | int prev, cur; |
164 | unsigned long iter = 0, success_iter = 0; |
165 | |
166 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
167 | do { |
168 | while (!fair_read_trylock(&frwlock)) |
169 | iter++; |
170 | success_iter++; |
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 | } |
179 | fair_read_unlock(&frwlock); |
4fd25765 |
180 | if (THREAD_READER_DELAY) |
181 | msleep(THREAD_READER_DELAY); |
1c21e42c |
182 | } while (!kthread_should_stop()); |
183 | printk("trylock_reader_thread/%lu iterations : %lu, " |
184 | "successful iterations : %lu\n", |
185 | (unsigned long)data, iter, success_iter); |
186 | return 0; |
187 | } |
188 | |
68f25f81 |
189 | DEFINE_PER_CPU(cycles_t, int_delaymin); |
190 | DEFINE_PER_CPU(cycles_t, int_delayavg); |
7f563886 |
191 | DEFINE_PER_CPU(cycles_t, int_delaymax); |
68f25f81 |
192 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
193 | |
f0a36bb1 |
194 | static void interrupt_reader_ipi(void *data) |
195 | { |
196 | int i; |
197 | int prev, cur; |
7f563886 |
198 | cycles_t time1, time2; |
68f25f81 |
199 | cycles_t *delaymax, *delaymin, *delayavg, *ipi_nr, delay; |
7f563886 |
200 | |
201 | /* |
202 | * Skip the ipi caller, not in irq context. |
203 | */ |
204 | if (!in_irq()) |
205 | return; |
f0a36bb1 |
206 | |
7f563886 |
207 | delaymax = &per_cpu(int_delaymax, smp_processor_id()); |
68f25f81 |
208 | delaymin = &per_cpu(int_delaymin, smp_processor_id()); |
209 | delayavg = &per_cpu(int_delayavg, smp_processor_id()); |
210 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
211 | |
212 | rdtsc_barrier(); |
7f563886 |
213 | time1 = get_cycles(); |
68f25f81 |
214 | rdtsc_barrier(); |
215 | |
f0a36bb1 |
216 | fair_read_lock(&frwlock); |
68f25f81 |
217 | |
218 | rdtsc_barrier(); |
7f563886 |
219 | time2 = get_cycles(); |
68f25f81 |
220 | rdtsc_barrier(); |
221 | delay = time2 - time1; |
222 | *delaymax = max(*delaymax, delay); |
223 | *delaymin = min(*delaymin, delay); |
224 | *delayavg += delay; |
225 | (*ipi_nr)++; |
f0a36bb1 |
226 | prev = var[0]; |
227 | for (i = 1; i < NR_VARS; i++) { |
228 | cur = var[i]; |
229 | if (cur != prev) |
230 | printk(KERN_ALERT |
231 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
232 | cur, prev, i); |
233 | } |
234 | fair_read_unlock(&frwlock); |
235 | } |
236 | |
1c21e42c |
237 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
238 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
239 | |
240 | static void trylock_interrupt_reader_ipi(void *data) |
241 | { |
242 | int i; |
243 | int prev, cur; |
244 | |
245 | /* |
246 | * Skip the ipi caller, not in irq context. |
247 | */ |
248 | if (!in_irq()) |
249 | return; |
250 | |
251 | per_cpu(trylock_int_iter, smp_processor_id())++; |
252 | while (!fair_read_trylock(&frwlock)) |
253 | per_cpu(trylock_int_iter, smp_processor_id())++; |
254 | per_cpu(trylock_int_success, smp_processor_id())++; |
255 | prev = var[0]; |
256 | for (i = 1; i < NR_VARS; i++) { |
257 | cur = var[i]; |
258 | if (cur != prev) |
259 | printk(KERN_ALERT |
260 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
261 | cur, prev, i); |
262 | } |
263 | fair_read_unlock(&frwlock); |
264 | } |
265 | |
266 | |
f0a36bb1 |
267 | static int interrupt_reader_thread(void *data) |
268 | { |
269 | unsigned long iter = 0; |
7f563886 |
270 | int i; |
271 | |
68f25f81 |
272 | for_each_online_cpu(i) { |
273 | per_cpu(int_delaymax, i) = 0; |
274 | per_cpu(int_delaymin, i) = ULLONG_MAX; |
275 | per_cpu(int_delayavg, i) = 0; |
276 | per_cpu(int_ipi_nr, i) = 0; |
277 | } |
f0a36bb1 |
278 | do { |
279 | iter++; |
280 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
281 | if (INTERRUPT_READER_DELAY) |
282 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
283 | } while (!kthread_should_stop()); |
284 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
285 | (unsigned long)data, iter); |
7f563886 |
286 | for_each_online_cpu(i) { |
4fd25765 |
287 | if (!per_cpu(int_ipi_nr, i)) |
288 | continue; |
68f25f81 |
289 | per_cpu(int_delayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
290 | printk("interrupt readers on CPU %i, " |
68f25f81 |
291 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
292 | i, |
293 | calibrate_cycles(per_cpu(int_delaymin, i)), |
294 | calibrate_cycles(per_cpu(int_delayavg, i)), |
295 | calibrate_cycles(per_cpu(int_delaymax, i))); |
7f563886 |
296 | } |
f0a36bb1 |
297 | return 0; |
298 | } |
299 | |
1c21e42c |
300 | static int trylock_interrupt_reader_thread(void *data) |
301 | { |
302 | unsigned long iter = 0; |
303 | int i; |
304 | |
305 | do { |
306 | iter++; |
307 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
308 | if (INTERRUPT_READER_DELAY) |
309 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
310 | } while (!kthread_should_stop()); |
311 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
312 | (unsigned long)data, iter); |
313 | for_each_online_cpu(i) { |
314 | printk("trylock interrupt readers on CPU %i, " |
315 | "iterations %lu, " |
316 | "successful iterations : %lu\n", |
317 | i, per_cpu(trylock_int_iter, i), |
318 | per_cpu(trylock_int_success, i)); |
68f25f81 |
319 | per_cpu(trylock_int_iter, i) = 0; |
320 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
321 | } |
322 | return 0; |
323 | } |
324 | |
f0a36bb1 |
325 | static int writer_thread(void *data) |
326 | { |
327 | int i; |
328 | int new; |
329 | unsigned long iter = 0; |
68f25f81 |
330 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
331 | delayavg = 0; |
f0a36bb1 |
332 | |
333 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
334 | do { |
335 | iter++; |
7f563886 |
336 | preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
337 | rdtsc_barrier(); |
7f563886 |
338 | time1 = get_cycles(); |
68f25f81 |
339 | rdtsc_barrier(); |
340 | |
4fd25765 |
341 | #if (TEST_INTERRUPTS) |
f0a36bb1 |
342 | fair_write_lock_irq(&frwlock); |
4fd25765 |
343 | #else |
344 | fair_write_lock(&frwlock); |
345 | #endif |
68f25f81 |
346 | |
347 | rdtsc_barrier(); |
7f563886 |
348 | time2 = get_cycles(); |
68f25f81 |
349 | rdtsc_barrier(); |
350 | delay = time2 - time1; |
351 | delaymax = max(delaymax, delay); |
352 | delaymin = min(delaymin, delay); |
353 | delayavg += delay; |
f0a36bb1 |
354 | new = (int)get_cycles(); |
355 | for (i = 0; i < NR_VARS; i++) { |
356 | var[i] = new; |
357 | } |
4fd25765 |
358 | #if (TEST_INTERRUPTS) |
f0a36bb1 |
359 | fair_write_unlock_irq(&frwlock); |
4fd25765 |
360 | #else |
361 | fair_write_unlock(&frwlock); |
362 | #endif |
7f563886 |
363 | preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
364 | if (WRITER_DELAY > 0) |
4d1751f9 |
365 | udelay(WRITER_DELAY); |
f0a36bb1 |
366 | } while (!kthread_should_stop()); |
68f25f81 |
367 | delayavg /= iter; |
7f563886 |
368 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
369 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
370 | (unsigned long)data, iter, |
371 | calibrate_cycles(delaymin), |
372 | calibrate_cycles(delayavg), |
373 | calibrate_cycles(delaymax)); |
f0a36bb1 |
374 | return 0; |
375 | } |
376 | |
1c21e42c |
377 | static int trylock_writer_thread(void *data) |
378 | { |
379 | int i; |
380 | int new; |
4fd25765 |
381 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
382 | |
383 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
384 | do { |
4fd25765 |
385 | iter++; |
386 | #if (TEST_INTERRUPTS) |
387 | if (fair_write_trylock_irq_else_subscribe(&frwlock)) |
388 | #else |
389 | if (fair_write_trylock_else_subscribe(&frwlock)) |
390 | #endif |
391 | goto locked; |
392 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
393 | for (;;) { |
1c21e42c |
394 | iter++; |
4fd25765 |
395 | #if (TEST_INTERRUPTS) |
396 | if (fair_write_trylock_irq_subscribed(&frwlock)) |
397 | #else |
398 | if (fair_write_trylock_subscribed(&frwlock)) |
399 | #endif |
400 | goto locked; |
1c21e42c |
401 | } |
4fd25765 |
402 | #else |
403 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
404 | iter++; |
405 | #if (TEST_INTERRUPTS) |
406 | if (fair_write_trylock_irq_subscribed(&frwlock)) |
407 | #else |
408 | if (fair_write_trylock_subscribed(&frwlock)) |
409 | #endif |
410 | goto locked; |
411 | } |
412 | #endif |
413 | fail++; |
414 | fair_write_unsubscribe(&frwlock); |
415 | goto loop; |
416 | locked: |
1c21e42c |
417 | success++; |
1c21e42c |
418 | new = (int)get_cycles(); |
419 | for (i = 0; i < NR_VARS; i++) { |
420 | var[i] = new; |
421 | } |
4fd25765 |
422 | #if (TEST_INTERRUPTS) |
1c21e42c |
423 | fair_write_unlock_irq(&frwlock); |
4fd25765 |
424 | #else |
425 | fair_write_unlock(&frwlock); |
426 | #endif |
427 | loop: |
428 | if (TRYLOCK_WRITER_DELAY > 0) |
429 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
430 | } while (!kthread_should_stop()); |
4fd25765 |
431 | printk("trylock_writer_thread/%lu iterations : " |
432 | "[try,success,fail after %d try], " |
433 | "%lu,%lu,%lu\n", |
434 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
435 | iter, success, fail); |
1c21e42c |
436 | return 0; |
437 | } |
438 | |
f0a36bb1 |
439 | static void fair_rwlock_create(void) |
440 | { |
441 | unsigned long i; |
442 | |
443 | for (i = 0; i < NR_READERS; i++) { |
444 | printk("starting reader thread %lu\n", i); |
445 | reader_threads[i] = kthread_run(reader_thread, (void *)i, |
446 | "frwlock_reader"); |
447 | BUG_ON(!reader_threads[i]); |
448 | } |
449 | |
1c21e42c |
450 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
451 | printk("starting trylock reader thread %lu\n", i); |
452 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
453 | (void *)i, "frwlock_trylock_reader"); |
454 | BUG_ON(!trylock_reader_threads[i]); |
455 | } |
4fd25765 |
456 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
457 | printk("starting interrupt reader %lu\n", i); |
458 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
459 | (void *)i, |
460 | "frwlock_interrupt_reader"); |
461 | } |
462 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
463 | printk("starting trylock interrupt reader %lu\n", i); |
464 | trylock_interrupt_reader[i] = |
465 | kthread_run(trylock_interrupt_reader_thread, |
466 | (void *)i, "frwlock_trylock_interrupt_reader"); |
467 | } |
f0a36bb1 |
468 | for (i = 0; i < NR_WRITERS; i++) { |
469 | printk("starting writer thread %lu\n", i); |
470 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
471 | "frwlock_writer"); |
472 | BUG_ON(!writer_threads[i]); |
473 | } |
1c21e42c |
474 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
475 | printk("starting trylock writer thread %lu\n", i); |
476 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
477 | (void *)i, "frwlock_trylock_writer"); |
478 | BUG_ON(!trylock_writer_threads[i]); |
479 | } |
f0a36bb1 |
480 | } |
481 | |
482 | static void fair_rwlock_stop(void) |
483 | { |
484 | unsigned long i; |
485 | |
1c21e42c |
486 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
487 | kthread_stop(writer_threads[i]); |
1c21e42c |
488 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
489 | kthread_stop(trylock_writer_threads[i]); |
490 | for (i = 0; i < NR_READERS; i++) |
f0a36bb1 |
491 | kthread_stop(reader_threads[i]); |
1c21e42c |
492 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
493 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
494 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
495 | kthread_stop(interrupt_reader[i]); |
496 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
497 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
498 | } |
499 | |
500 | |
501 | static void perform_test(const char *name, void (*callback)(void)) |
502 | { |
503 | printk("%s\n", name); |
504 | callback(); |
505 | } |
506 | |
507 | static int my_open(struct inode *inode, struct file *file) |
508 | { |
68f25f81 |
509 | unsigned long i; |
510 | cycles_t time1, time2, delay; |
511 | |
512 | printk("** get_cycles calibration **\n"); |
513 | cycles_calibration_min = ULLONG_MAX; |
514 | cycles_calibration_avg = 0; |
515 | cycles_calibration_max = 0; |
516 | |
517 | local_irq_disable(); |
518 | for (i = 0; i < 10; i++) { |
519 | rdtsc_barrier(); |
520 | time1 = get_cycles(); |
521 | rdtsc_barrier(); |
522 | rdtsc_barrier(); |
523 | time2 = get_cycles(); |
524 | rdtsc_barrier(); |
525 | delay = time2 - time1; |
526 | cycles_calibration_min = min(cycles_calibration_min, delay); |
527 | cycles_calibration_avg += delay; |
528 | cycles_calibration_max = max(cycles_calibration_max, delay); |
529 | } |
530 | cycles_calibration_avg /= 10; |
531 | local_irq_enable(); |
532 | |
533 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
534 | "results calibrated on avg\n", |
535 | cycles_calibration_min, |
536 | cycles_calibration_avg, |
537 | cycles_calibration_max); |
538 | |
539 | printk("** Single writer test, no contention **\n"); |
540 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
541 | "frwlock_writer"); |
542 | BUG_ON(!writer_threads[0]); |
543 | ssleep(SINGLE_WRITER_TEST_DURATION); |
544 | kthread_stop(writer_threads[0]); |
545 | |
4fd25765 |
546 | printk("** Single trylock writer test, no contention **\n"); |
547 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
548 | (void *)0, |
549 | "trylock_frwlock_writer"); |
550 | BUG_ON(!trylock_writer_threads[0]); |
551 | ssleep(SINGLE_WRITER_TEST_DURATION); |
552 | kthread_stop(trylock_writer_threads[0]); |
553 | |
68f25f81 |
554 | printk("** Single reader test, no contention **\n"); |
555 | reader_threads[0] = kthread_run(reader_thread, (void *)0, |
556 | "frwlock_reader"); |
557 | BUG_ON(!reader_threads[0]); |
558 | ssleep(SINGLE_READER_TEST_DURATION); |
559 | kthread_stop(reader_threads[0]); |
560 | |
561 | printk("** Multiple readers test, no contention **\n"); |
562 | for (i = 0; i < NR_READERS; i++) { |
563 | printk("starting reader thread %lu\n", i); |
564 | reader_threads[i] = kthread_run(reader_thread, (void *)i, |
565 | "frwlock_reader"); |
566 | BUG_ON(!reader_threads[i]); |
567 | } |
568 | ssleep(SINGLE_READER_TEST_DURATION); |
569 | for (i = 0; i < NR_READERS; i++) |
570 | kthread_stop(reader_threads[i]); |
571 | |
572 | printk("** High contention test **\n"); |
f0a36bb1 |
573 | perform_test("fair-rwlock-create", fair_rwlock_create); |
f36c4112 |
574 | ssleep(TEST_DURATION); |
f0a36bb1 |
575 | perform_test("fair-rwlock-stop", fair_rwlock_stop); |
576 | |
577 | return -EPERM; |
578 | } |
579 | |
580 | |
581 | static struct file_operations my_operations = { |
582 | .open = my_open, |
583 | }; |
584 | |
585 | int init_module(void) |
586 | { |
587 | pentry = create_proc_entry("testfrwlock", 0444, NULL); |
588 | if (pentry) |
589 | pentry->proc_fops = &my_operations; |
590 | |
591 | printk("NR_CPUS : %d\n", NR_CPUS); |
592 | printk("THREAD_ROFFSET : %lX\n", THREAD_ROFFSET); |
593 | printk("THREAD_RMASK : %lX\n", THREAD_RMASK); |
f0a36bb1 |
594 | printk("SOFTIRQ_ROFFSET : %lX\n", SOFTIRQ_ROFFSET); |
595 | printk("SOFTIRQ_RMASK : %lX\n", SOFTIRQ_RMASK); |
f0a36bb1 |
596 | printk("HARDIRQ_ROFFSET : %lX\n", HARDIRQ_ROFFSET); |
597 | printk("HARDIRQ_RMASK : %lX\n", HARDIRQ_RMASK); |
7f563886 |
598 | printk("SUBSCRIBERS_WOFFSET : %lX\n", SUBSCRIBERS_WOFFSET); |
599 | printk("SUBSCRIBERS_WMASK : %lX\n", SUBSCRIBERS_WMASK); |
600 | printk("WRITER_MUTEX : %lX\n", WRITER_MUTEX); |
601 | printk("SOFTIRQ_WMASK : %lX\n", SOFTIRQ_WMASK); |
f0a36bb1 |
602 | printk("HARDIRQ_WMASK : %lX\n", HARDIRQ_WMASK); |
603 | |
604 | return 0; |
605 | } |
606 | |
607 | void cleanup_module(void) |
608 | { |
609 | remove_proc_entry("testfrwlock", NULL); |
610 | } |
611 | |
612 | MODULE_LICENSE("GPL"); |
613 | MODULE_AUTHOR("Mathieu Desnoyers"); |
614 | MODULE_DESCRIPTION("Fair rwlock test"); |