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1 | /* test-wbias-rwlock.c |
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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/kthread.h> |
10 | #include <linux/delay.h> |
11 | #include <linux/hardirq.h> |
12 | #include <linux/module.h> |
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13 | #include <linux/percpu.h> |
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14 | #include <linux/spinlock.h> |
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15 | #include <asm/ptrace.h> |
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16 | #include <linux/wbias-rwlock.h> |
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17 | |
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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 | |
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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 |
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29 | #define NR_NPREADERS 2 |
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 |
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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 |
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47 | #else |
48 | #define NR_INTERRUPT_READERS 0 |
49 | #define NR_TRYLOCK_INTERRUPT_READERS 0 |
50 | #endif |
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51 | |
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52 | /* |
53 | * 1 : test with thread preemption readers. |
54 | * 0 : test only with non-preemptable thread readers. |
55 | */ |
56 | #define TEST_PREEMPT 1 |
57 | |
58 | #if (TEST_PREEMPT) |
59 | #define NR_PREADERS 2 |
60 | #else |
61 | #define NR_PREADERS 0 |
62 | #endif |
63 | |
64 | |
4d1751f9 |
65 | /* |
66 | * Writer iteration delay, in us. 0 for busy loop. Caution : writers can |
67 | * starve readers. |
68 | */ |
cd7cf33d |
69 | #define WRITER_DELAY 100 |
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70 | #define TRYLOCK_WRITER_DELAY 1000 |
71 | |
72 | /* |
73 | * Number of iterations after which a trylock writer fails. |
74 | * -1 for infinite loop. |
75 | */ |
76 | #define TRYLOCK_WRITERS_FAIL_ITER 100 |
77 | |
78 | /* Thread and interrupt reader delay, in ms */ |
79 | #define THREAD_READER_DELAY 0 /* busy loop */ |
80 | #define INTERRUPT_READER_DELAY 100 |
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81 | |
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82 | static int var[NR_VARS]; |
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83 | static struct task_struct *preader_threads[NR_PREADERS]; |
84 | static struct task_struct *npreader_threads[NR_NPREADERS]; |
1c21e42c |
85 | static struct task_struct *trylock_reader_threads[NR_TRYLOCK_READERS]; |
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86 | static struct task_struct *writer_threads[NR_WRITERS]; |
1c21e42c |
87 | static struct task_struct *trylock_writer_threads[NR_TRYLOCK_WRITERS]; |
4fd25765 |
88 | static struct task_struct *interrupt_reader[NR_INTERRUPT_READERS]; |
89 | static struct task_struct *trylock_interrupt_reader[NR_TRYLOCK_INTERRUPT_READERS]; |
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90 | |
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91 | #if (TEST_STD_RWLOCK) |
92 | |
93 | static DEFINE_RWLOCK(std_rw_lock); |
94 | |
95 | #define wrap_read_lock() read_lock(&std_rw_lock) |
96 | #define wrap_read_trylock() read_trylock(&std_rw_lock) |
97 | #define wrap_read_unlock() read_unlock(&std_rw_lock) |
98 | |
1f5845d5 |
99 | #define wrap_read_lock_inatomic() read_lock(&std_rw_lock) |
100 | #define wrap_read_trylock_inatomic() read_trylock(&std_rw_lock) |
101 | #define wrap_read_unlock_inatomic() read_unlock(&std_rw_lock) |
102 | |
cd7cf33d |
103 | #define wrap_read_lock_irq() read_lock(&std_rw_lock) |
104 | #define wrap_read_trylock_irq() read_trylock(&std_rw_lock) |
105 | #define wrap_read_unlock_irq() read_unlock(&std_rw_lock) |
106 | |
107 | #if (TEST_INTERRUPTS) |
108 | #define wrap_write_lock() write_lock_irq(&std_rw_lock) |
109 | #define wrap_write_unlock() write_unlock_irq(&std_rw_lock) |
110 | #else |
111 | #define wrap_write_lock() write_lock(&std_rw_lock) |
112 | #define wrap_write_unlock() write_unlock(&std_rw_lock) |
113 | #endif |
114 | |
115 | #else |
116 | |
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117 | static DEFINE_WBIAS_RWLOCK(wbiasrwlock); |
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118 | |
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119 | #define wrap_read_lock() wbias_read_lock(&wbiasrwlock) |
120 | #define wrap_read_trylock() wbias_read_trylock(&wbiasrwlock) |
121 | #define wrap_read_unlock() wbias_read_unlock(&wbiasrwlock) |
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122 | |
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123 | #define wrap_read_lock_inatomic() wbias_read_lock_inatomic(&wbiasrwlock) |
124 | #define wrap_read_trylock_inatomic() \ |
125 | wbias_read_trylock_inatomic(&wbiasrwlock) |
126 | #define wrap_read_unlock_inatomic() \ |
127 | wbias_read_unlock_inatomic(&wbiasrwlock) |
128 | |
0e0fdeb6 |
129 | #define wrap_read_lock_irq() wbias_read_lock_irq(&wbiasrwlock) |
130 | #define wrap_read_trylock_irq() wbias_read_trylock_irq(&wbiasrwlock) |
131 | #define wrap_read_unlock_irq() wbias_read_unlock_irq(&wbiasrwlock) |
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132 | |
133 | #if (TEST_INTERRUPTS) |
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134 | #define wrap_write_lock() wbias_write_lock_irq(&wbiasrwlock) |
135 | #define wrap_write_unlock() wbias_write_unlock_irq(&wbiasrwlock) |
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136 | #define wrap_write_trylock_else_subscribe() \ |
137 | wbias_write_trylock_irq_else_subscribe(&wbiasrwlock) |
138 | #define wrap_write_trylock_subscribed() \ |
139 | wbias_write_trylock_irq_subscribed(&wbiasrwlock) |
cd7cf33d |
140 | #else |
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141 | #if (TEST_PREEMPT) |
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142 | #define wrap_write_lock() wbias_write_lock(&wbiasrwlock) |
143 | #define wrap_write_unlock() wbias_write_unlock(&wbiasrwlock) |
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144 | #define wrap_write_trylock_else_subscribe() \ |
145 | wbias_write_trylock_else_subscribe(&wbiasrwlock) |
146 | #define wrap_write_trylock_subscribed() \ |
147 | wbias_write_trylock_subscribed(&wbiasrwlock) |
148 | #else |
149 | #else |
150 | #define wrap_write_lock() wbias_write_lock_atomic(&wbiasrwlock) |
151 | #define wrap_write_unlock() wbias_write_unlock_atomic(&wbiasrwlock) |
152 | #define wrap_write_trylock_else_subscribe() \ |
153 | wbias_write_trylock_atomic_else_subscribe(&wbiasrwlock) |
154 | #define wrap_write_trylock_subscribed() \ |
155 | wbias_write_trylock_atomic_subscribed(&wbiasrwlock) |
156 | #endif |
cd7cf33d |
157 | #endif |
158 | |
159 | #endif |
160 | |
68f25f81 |
161 | static cycles_t cycles_calibration_min, |
162 | cycles_calibration_avg, |
163 | cycles_calibration_max; |
164 | |
165 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
166 | { |
167 | return cycles - cycles_calibration_avg; |
168 | } |
169 | |
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170 | struct proc_dir_entry *pentry = NULL; |
171 | |
b37c9208 |
172 | static int p_or_np_reader_thread(const char *typename, |
173 | void *data, int preemptable) |
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174 | { |
175 | int i; |
176 | int prev, cur; |
177 | unsigned long iter = 0; |
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178 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
179 | delayavg = 0; |
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180 | |
b37c9208 |
181 | printk("%s/%lu runnning\n", typename, (unsigned long)data); |
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182 | do { |
183 | iter++; |
1f5845d5 |
184 | if (!preemptable) |
185 | preempt_disable(); |
68f25f81 |
186 | rdtsc_barrier(); |
7f563886 |
187 | time1 = get_cycles(); |
68f25f81 |
188 | rdtsc_barrier(); |
189 | |
1f5845d5 |
190 | if (!preemptable) |
191 | wrap_read_lock_inatomic(); |
192 | else |
193 | wrap_read_lock(); |
68f25f81 |
194 | |
195 | rdtsc_barrier(); |
7f563886 |
196 | time2 = get_cycles(); |
68f25f81 |
197 | rdtsc_barrier(); |
198 | delay = time2 - time1; |
199 | delaymax = max(delaymax, delay); |
200 | delaymin = min(delaymin, delay); |
201 | delayavg += delay; |
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202 | prev = var[0]; |
203 | for (i = 1; i < NR_VARS; i++) { |
204 | cur = var[i]; |
205 | if (cur != prev) |
206 | printk(KERN_ALERT |
207 | "Unequal cur %d/prev %d at i %d, iter %lu " |
208 | "in thread\n", cur, prev, i, iter); |
209 | } |
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210 | |
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211 | if (!preemptable) |
212 | wrap_read_unlock_inatomic(); |
213 | else |
214 | wrap_read_unlock(); |
215 | if (!preemptable) |
216 | preempt_enable(); |
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217 | if (THREAD_READER_DELAY) |
218 | msleep(THREAD_READER_DELAY); |
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219 | } while (!kthread_should_stop()); |
4fd25765 |
220 | if (!iter) { |
b37c9208 |
221 | printk("%s/%lu iterations : %lu", typename, |
4fd25765 |
222 | (unsigned long)data, iter); |
223 | } else { |
224 | delayavg /= iter; |
b37c9208 |
225 | printk("%s/%lu iterations : %lu, " |
4fd25765 |
226 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
b37c9208 |
227 | typename, |
4fd25765 |
228 | (unsigned long)data, iter, |
229 | calibrate_cycles(delaymin), |
230 | calibrate_cycles(delayavg), |
231 | calibrate_cycles(delaymax)); |
232 | } |
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233 | return 0; |
234 | } |
235 | |
1f5845d5 |
236 | static int preader_thread(void *data) |
237 | { |
b37c9208 |
238 | return p_or_np_reader_thread("preader_thread", data, 1); |
1f5845d5 |
239 | } |
240 | |
241 | static int npreader_thread(void *data) |
242 | { |
b37c9208 |
243 | return p_or_np_reader_thread("npreader_thread", data, 0); |
1f5845d5 |
244 | } |
245 | |
1c21e42c |
246 | static int trylock_reader_thread(void *data) |
247 | { |
248 | int i; |
249 | int prev, cur; |
250 | unsigned long iter = 0, success_iter = 0; |
251 | |
252 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
253 | do { |
cd7cf33d |
254 | while (!wrap_read_trylock()) |
1c21e42c |
255 | iter++; |
256 | success_iter++; |
257 | prev = var[0]; |
258 | for (i = 1; i < NR_VARS; i++) { |
259 | cur = var[i]; |
260 | if (cur != prev) |
261 | printk(KERN_ALERT |
262 | "Unequal cur %d/prev %d at i %d, iter %lu " |
263 | "in thread\n", cur, prev, i, iter); |
264 | } |
cd7cf33d |
265 | wrap_read_unlock(); |
4fd25765 |
266 | if (THREAD_READER_DELAY) |
267 | msleep(THREAD_READER_DELAY); |
1c21e42c |
268 | } while (!kthread_should_stop()); |
269 | printk("trylock_reader_thread/%lu iterations : %lu, " |
270 | "successful iterations : %lu\n", |
271 | (unsigned long)data, iter, success_iter); |
272 | return 0; |
273 | } |
274 | |
68f25f81 |
275 | DEFINE_PER_CPU(cycles_t, int_delaymin); |
276 | DEFINE_PER_CPU(cycles_t, int_delayavg); |
7f563886 |
277 | DEFINE_PER_CPU(cycles_t, int_delaymax); |
68f25f81 |
278 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
279 | |
f0a36bb1 |
280 | static void interrupt_reader_ipi(void *data) |
281 | { |
282 | int i; |
283 | int prev, cur; |
7f563886 |
284 | cycles_t time1, time2; |
68f25f81 |
285 | cycles_t *delaymax, *delaymin, *delayavg, *ipi_nr, delay; |
7f563886 |
286 | |
287 | /* |
288 | * Skip the ipi caller, not in irq context. |
289 | */ |
290 | if (!in_irq()) |
291 | return; |
f0a36bb1 |
292 | |
7f563886 |
293 | delaymax = &per_cpu(int_delaymax, smp_processor_id()); |
68f25f81 |
294 | delaymin = &per_cpu(int_delaymin, smp_processor_id()); |
295 | delayavg = &per_cpu(int_delayavg, smp_processor_id()); |
296 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
297 | |
298 | rdtsc_barrier(); |
7f563886 |
299 | time1 = get_cycles(); |
68f25f81 |
300 | rdtsc_barrier(); |
301 | |
cd7cf33d |
302 | wrap_read_lock_irq(); |
68f25f81 |
303 | |
304 | rdtsc_barrier(); |
7f563886 |
305 | time2 = get_cycles(); |
68f25f81 |
306 | rdtsc_barrier(); |
307 | delay = time2 - time1; |
308 | *delaymax = max(*delaymax, delay); |
309 | *delaymin = min(*delaymin, delay); |
310 | *delayavg += delay; |
311 | (*ipi_nr)++; |
f0a36bb1 |
312 | prev = var[0]; |
313 | for (i = 1; i < NR_VARS; i++) { |
314 | cur = var[i]; |
315 | if (cur != prev) |
316 | printk(KERN_ALERT |
317 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
318 | cur, prev, i); |
319 | } |
cd7cf33d |
320 | wrap_read_unlock_irq(); |
f0a36bb1 |
321 | } |
322 | |
1c21e42c |
323 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
324 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
325 | |
326 | static void trylock_interrupt_reader_ipi(void *data) |
327 | { |
328 | int i; |
329 | int prev, cur; |
330 | |
331 | /* |
332 | * Skip the ipi caller, not in irq context. |
333 | */ |
334 | if (!in_irq()) |
335 | return; |
336 | |
337 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
338 | while (!wrap_read_trylock_irq()) |
1c21e42c |
339 | per_cpu(trylock_int_iter, smp_processor_id())++; |
340 | per_cpu(trylock_int_success, smp_processor_id())++; |
341 | prev = var[0]; |
342 | for (i = 1; i < NR_VARS; i++) { |
343 | cur = var[i]; |
344 | if (cur != prev) |
345 | printk(KERN_ALERT |
346 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
347 | cur, prev, i); |
348 | } |
cd7cf33d |
349 | wrap_read_unlock_irq(); |
1c21e42c |
350 | } |
351 | |
352 | |
f0a36bb1 |
353 | static int interrupt_reader_thread(void *data) |
354 | { |
355 | unsigned long iter = 0; |
7f563886 |
356 | int i; |
357 | |
68f25f81 |
358 | for_each_online_cpu(i) { |
359 | per_cpu(int_delaymax, i) = 0; |
360 | per_cpu(int_delaymin, i) = ULLONG_MAX; |
361 | per_cpu(int_delayavg, i) = 0; |
362 | per_cpu(int_ipi_nr, i) = 0; |
363 | } |
f0a36bb1 |
364 | do { |
365 | iter++; |
366 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
367 | if (INTERRUPT_READER_DELAY) |
368 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
369 | } while (!kthread_should_stop()); |
370 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
371 | (unsigned long)data, iter); |
7f563886 |
372 | for_each_online_cpu(i) { |
4fd25765 |
373 | if (!per_cpu(int_ipi_nr, i)) |
374 | continue; |
68f25f81 |
375 | per_cpu(int_delayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
376 | printk("interrupt readers on CPU %i, " |
68f25f81 |
377 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
378 | i, |
379 | calibrate_cycles(per_cpu(int_delaymin, i)), |
380 | calibrate_cycles(per_cpu(int_delayavg, i)), |
381 | calibrate_cycles(per_cpu(int_delaymax, i))); |
7f563886 |
382 | } |
f0a36bb1 |
383 | return 0; |
384 | } |
385 | |
1c21e42c |
386 | static int trylock_interrupt_reader_thread(void *data) |
387 | { |
388 | unsigned long iter = 0; |
389 | int i; |
390 | |
391 | do { |
392 | iter++; |
393 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
394 | if (INTERRUPT_READER_DELAY) |
395 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
396 | } while (!kthread_should_stop()); |
397 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
398 | (unsigned long)data, iter); |
399 | for_each_online_cpu(i) { |
400 | printk("trylock interrupt readers on CPU %i, " |
401 | "iterations %lu, " |
402 | "successful iterations : %lu\n", |
403 | i, per_cpu(trylock_int_iter, i), |
404 | per_cpu(trylock_int_success, i)); |
68f25f81 |
405 | per_cpu(trylock_int_iter, i) = 0; |
406 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
407 | } |
408 | return 0; |
409 | } |
410 | |
f0a36bb1 |
411 | static int writer_thread(void *data) |
412 | { |
413 | int i; |
414 | int new; |
415 | unsigned long iter = 0; |
68f25f81 |
416 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
417 | delayavg = 0; |
f0a36bb1 |
418 | |
419 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
420 | do { |
421 | iter++; |
ae4a4ebf |
422 | //preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
423 | rdtsc_barrier(); |
7f563886 |
424 | time1 = get_cycles(); |
68f25f81 |
425 | rdtsc_barrier(); |
426 | |
cd7cf33d |
427 | wrap_write_lock(); |
68f25f81 |
428 | |
429 | rdtsc_barrier(); |
7f563886 |
430 | time2 = get_cycles(); |
68f25f81 |
431 | rdtsc_barrier(); |
432 | delay = time2 - time1; |
433 | delaymax = max(delaymax, delay); |
434 | delaymin = min(delaymin, delay); |
435 | delayavg += delay; |
f0a36bb1 |
436 | new = (int)get_cycles(); |
437 | for (i = 0; i < NR_VARS; i++) { |
438 | var[i] = new; |
439 | } |
cd7cf33d |
440 | |
441 | wrap_write_unlock(); |
442 | |
ae4a4ebf |
443 | //preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
444 | if (WRITER_DELAY > 0) |
4d1751f9 |
445 | udelay(WRITER_DELAY); |
f0a36bb1 |
446 | } while (!kthread_should_stop()); |
68f25f81 |
447 | delayavg /= iter; |
7f563886 |
448 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
449 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
450 | (unsigned long)data, iter, |
451 | calibrate_cycles(delaymin), |
452 | calibrate_cycles(delayavg), |
453 | calibrate_cycles(delaymax)); |
f0a36bb1 |
454 | return 0; |
455 | } |
456 | |
cd7cf33d |
457 | #if (TEST_STD_RWLOCK) |
458 | static int trylock_writer_thread(void *data) |
459 | { |
460 | int i; |
461 | int new; |
462 | unsigned long iter = 0, success = 0, fail = 0; |
463 | |
464 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
465 | do { |
466 | #if (TEST_INTERRUPTS) |
467 | /* std write trylock cannot disable interrupts. */ |
468 | local_irq_disable(); |
469 | #endif |
470 | |
471 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
472 | for (;;) { |
473 | iter++; |
474 | if (write_trylock(&std_rw_lock)) |
475 | goto locked; |
476 | } |
477 | #else |
478 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
479 | iter++; |
480 | if (write_trylock(&std_rw_lock)) |
481 | goto locked; |
482 | } |
483 | #endif |
484 | fail++; |
485 | #if (TEST_INTERRUPTS) |
486 | local_irq_enable(); |
487 | #endif |
488 | goto loop; |
489 | locked: |
490 | success++; |
491 | new = (int)get_cycles(); |
492 | for (i = 0; i < NR_VARS; i++) { |
493 | var[i] = new; |
494 | } |
495 | #if (TEST_INTERRUPTS) |
496 | write_unlock_irq(&std_rw_lock); |
497 | #else |
498 | write_unlock(&std_rw_lock); |
499 | #endif |
500 | loop: |
501 | if (TRYLOCK_WRITER_DELAY > 0) |
502 | udelay(TRYLOCK_WRITER_DELAY); |
503 | } while (!kthread_should_stop()); |
504 | printk("trylock_writer_thread/%lu iterations : " |
505 | "[try,success,fail after %d try], " |
506 | "%lu,%lu,%lu\n", |
507 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
508 | iter, success, fail); |
509 | return 0; |
510 | } |
511 | |
512 | #else /* !TEST_STD_RWLOCK */ |
513 | |
1c21e42c |
514 | static int trylock_writer_thread(void *data) |
515 | { |
516 | int i; |
517 | int new; |
4fd25765 |
518 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
519 | |
520 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
521 | do { |
4fd25765 |
522 | iter++; |
992fbe0f |
523 | if (wrap_write_trylock_else_subscribe()) |
4fd25765 |
524 | goto locked; |
cd7cf33d |
525 | |
4fd25765 |
526 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
527 | for (;;) { |
1c21e42c |
528 | iter++; |
992fbe0f |
529 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
530 | goto locked; |
1c21e42c |
531 | } |
4fd25765 |
532 | #else |
cd7cf33d |
533 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
534 | iter++; |
992fbe0f |
535 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
536 | goto locked; |
537 | } |
538 | #endif |
539 | fail++; |
0e0fdeb6 |
540 | wbias_write_unsubscribe(&wbiasrwlock); |
4fd25765 |
541 | goto loop; |
542 | locked: |
1c21e42c |
543 | success++; |
1c21e42c |
544 | new = (int)get_cycles(); |
545 | for (i = 0; i < NR_VARS; i++) { |
546 | var[i] = new; |
547 | } |
992fbe0f |
548 | wrap_write_unlock(); |
4fd25765 |
549 | loop: |
550 | if (TRYLOCK_WRITER_DELAY > 0) |
551 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
552 | } while (!kthread_should_stop()); |
4fd25765 |
553 | printk("trylock_writer_thread/%lu iterations : " |
554 | "[try,success,fail after %d try], " |
555 | "%lu,%lu,%lu\n", |
556 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
557 | iter, success, fail); |
1c21e42c |
558 | return 0; |
559 | } |
560 | |
cd7cf33d |
561 | #endif /* TEST_STD_RWLOCK */ |
562 | |
0e0fdeb6 |
563 | static void wbias_rwlock_create(void) |
f0a36bb1 |
564 | { |
565 | unsigned long i; |
566 | |
1f5845d5 |
567 | for (i = 0; i < NR_PREADERS; i++) { |
568 | printk("starting preemptable reader thread %lu\n", i); |
569 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
570 | "wbiasrwlock_preader"); |
571 | BUG_ON(!preader_threads[i]); |
572 | } |
573 | |
574 | for (i = 0; i < NR_NPREADERS; i++) { |
575 | printk("starting non-preemptable reader thread %lu\n", i); |
576 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
577 | "wbiasrwlock_npreader"); |
578 | BUG_ON(!npreader_threads[i]); |
f0a36bb1 |
579 | } |
580 | |
1c21e42c |
581 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
582 | printk("starting trylock reader thread %lu\n", i); |
583 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
0e0fdeb6 |
584 | (void *)i, "wbiasrwlock_trylock_reader"); |
1c21e42c |
585 | BUG_ON(!trylock_reader_threads[i]); |
586 | } |
4fd25765 |
587 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
588 | printk("starting interrupt reader %lu\n", i); |
589 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
590 | (void *)i, |
0e0fdeb6 |
591 | "wbiasrwlock_interrupt_reader"); |
4fd25765 |
592 | } |
593 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
594 | printk("starting trylock interrupt reader %lu\n", i); |
595 | trylock_interrupt_reader[i] = |
596 | kthread_run(trylock_interrupt_reader_thread, |
0e0fdeb6 |
597 | (void *)i, "wbiasrwlock_trylock_interrupt_reader"); |
4fd25765 |
598 | } |
f0a36bb1 |
599 | for (i = 0; i < NR_WRITERS; i++) { |
600 | printk("starting writer thread %lu\n", i); |
601 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
0e0fdeb6 |
602 | "wbiasrwlock_writer"); |
f0a36bb1 |
603 | BUG_ON(!writer_threads[i]); |
604 | } |
1c21e42c |
605 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
606 | printk("starting trylock writer thread %lu\n", i); |
607 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
0e0fdeb6 |
608 | (void *)i, "wbiasrwlock_trylock_writer"); |
1c21e42c |
609 | BUG_ON(!trylock_writer_threads[i]); |
610 | } |
f0a36bb1 |
611 | } |
612 | |
0e0fdeb6 |
613 | static void wbias_rwlock_stop(void) |
f0a36bb1 |
614 | { |
615 | unsigned long i; |
616 | |
1c21e42c |
617 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
618 | kthread_stop(writer_threads[i]); |
1c21e42c |
619 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
620 | kthread_stop(trylock_writer_threads[i]); |
1f5845d5 |
621 | for (i = 0; i < NR_NPREADERS; i++) |
622 | kthread_stop(npreader_threads[i]); |
623 | for (i = 0; i < NR_PREADERS; i++) |
624 | kthread_stop(preader_threads[i]); |
1c21e42c |
625 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
626 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
627 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
628 | kthread_stop(interrupt_reader[i]); |
629 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
630 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
631 | } |
632 | |
633 | |
634 | static void perform_test(const char *name, void (*callback)(void)) |
635 | { |
636 | printk("%s\n", name); |
637 | callback(); |
638 | } |
639 | |
640 | static int my_open(struct inode *inode, struct file *file) |
641 | { |
68f25f81 |
642 | unsigned long i; |
643 | cycles_t time1, time2, delay; |
644 | |
645 | printk("** get_cycles calibration **\n"); |
646 | cycles_calibration_min = ULLONG_MAX; |
647 | cycles_calibration_avg = 0; |
648 | cycles_calibration_max = 0; |
649 | |
650 | local_irq_disable(); |
651 | for (i = 0; i < 10; i++) { |
652 | rdtsc_barrier(); |
653 | time1 = get_cycles(); |
654 | rdtsc_barrier(); |
655 | rdtsc_barrier(); |
656 | time2 = get_cycles(); |
657 | rdtsc_barrier(); |
658 | delay = time2 - time1; |
659 | cycles_calibration_min = min(cycles_calibration_min, delay); |
660 | cycles_calibration_avg += delay; |
661 | cycles_calibration_max = max(cycles_calibration_max, delay); |
662 | } |
663 | cycles_calibration_avg /= 10; |
664 | local_irq_enable(); |
665 | |
666 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
667 | "results calibrated on avg\n", |
668 | cycles_calibration_min, |
669 | cycles_calibration_avg, |
670 | cycles_calibration_max); |
193771da |
671 | printk("\n"); |
68f25f81 |
672 | |
673 | printk("** Single writer test, no contention **\n"); |
dac86829 |
674 | wbias_rwlock_profile_latency_reset(); |
68f25f81 |
675 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
676 | "wbiasrwlock_writer"); |
68f25f81 |
677 | BUG_ON(!writer_threads[0]); |
678 | ssleep(SINGLE_WRITER_TEST_DURATION); |
679 | kthread_stop(writer_threads[0]); |
193771da |
680 | printk("\n"); |
68f25f81 |
681 | |
dac86829 |
682 | wbias_rwlock_profile_latency_print(); |
683 | |
4fd25765 |
684 | printk("** Single trylock writer test, no contention **\n"); |
dac86829 |
685 | wbias_rwlock_profile_latency_reset(); |
4fd25765 |
686 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
687 | (void *)0, |
0e0fdeb6 |
688 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
689 | BUG_ON(!trylock_writer_threads[0]); |
690 | ssleep(SINGLE_WRITER_TEST_DURATION); |
691 | kthread_stop(trylock_writer_threads[0]); |
193771da |
692 | printk("\n"); |
4fd25765 |
693 | |
dac86829 |
694 | wbias_rwlock_profile_latency_print(); |
695 | |
1f5845d5 |
696 | printk("** Single preemptable reader test, no contention **\n"); |
697 | wbias_rwlock_profile_latency_reset(); |
698 | preader_threads[0] = kthread_run(preader_thread, (void *)0, |
699 | "wbiasrwlock_preader"); |
700 | BUG_ON(!preader_threads[0]); |
701 | ssleep(SINGLE_READER_TEST_DURATION); |
702 | kthread_stop(preader_threads[0]); |
703 | printk("\n"); |
704 | |
705 | wbias_rwlock_profile_latency_print(); |
706 | |
707 | printk("** Single non-preemptable reader test, no contention **\n"); |
dac86829 |
708 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
709 | npreader_threads[0] = kthread_run(npreader_thread, (void *)0, |
710 | "wbiasrwlock_npreader"); |
711 | BUG_ON(!npreader_threads[0]); |
68f25f81 |
712 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
713 | kthread_stop(npreader_threads[0]); |
193771da |
714 | printk("\n"); |
68f25f81 |
715 | |
dac86829 |
716 | wbias_rwlock_profile_latency_print(); |
717 | |
1f5845d5 |
718 | printk("** Multiple p/non-p readers test, no contention **\n"); |
dac86829 |
719 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
720 | for (i = 0; i < NR_PREADERS; i++) { |
721 | printk("starting preader thread %lu\n", i); |
722 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
723 | "wbiasrwlock_preader"); |
724 | BUG_ON(!preader_threads[i]); |
725 | } |
726 | for (i = 0; i < NR_NPREADERS; i++) { |
727 | printk("starting npreader thread %lu\n", i); |
728 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
729 | "wbiasrwlock_npreader"); |
730 | BUG_ON(!npreader_threads[i]); |
68f25f81 |
731 | } |
732 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
733 | for (i = 0; i < NR_NPREADERS; i++) |
734 | kthread_stop(npreader_threads[i]); |
735 | for (i = 0; i < NR_PREADERS; i++) |
736 | kthread_stop(preader_threads[i]); |
193771da |
737 | printk("\n"); |
68f25f81 |
738 | |
dac86829 |
739 | wbias_rwlock_profile_latency_print(); |
740 | |
68f25f81 |
741 | printk("** High contention test **\n"); |
dac86829 |
742 | wbias_rwlock_profile_latency_reset(); |
0e0fdeb6 |
743 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
744 | ssleep(TEST_DURATION); |
0e0fdeb6 |
745 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
193771da |
746 | printk("\n"); |
dac86829 |
747 | wbias_rwlock_profile_latency_print(); |
f0a36bb1 |
748 | |
749 | return -EPERM; |
750 | } |
751 | |
752 | |
753 | static struct file_operations my_operations = { |
754 | .open = my_open, |
755 | }; |
756 | |
757 | int init_module(void) |
758 | { |
0e0fdeb6 |
759 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
760 | if (pentry) |
761 | pentry->proc_fops = &my_operations; |
762 | |
d1f36a28 |
763 | printk("PTHREAD_ROFFSET : %016lX\n", PTHREAD_ROFFSET); |
764 | printk("PTHREAD_RMASK : %016lX\n", PTHREAD_RMASK); |
765 | printk("NPTHREAD_ROFFSET : %016lX\n", NPTHREAD_ROFFSET); |
766 | printk("NPTHREAD_RMASK : %016lX\n", NPTHREAD_RMASK); |
767 | printk("SOFTIRQ_ROFFSET : %016lX\n", SOFTIRQ_ROFFSET); |
768 | printk("SOFTIRQ_RMASK : %016lX\n", SOFTIRQ_RMASK); |
769 | printk("HARDIRQ_ROFFSET : %016lX\n", HARDIRQ_ROFFSET); |
770 | printk("HARDIRQ_RMASK : %016lX\n", HARDIRQ_RMASK); |
771 | printk("PTHREAD_WOFFSET : %016lX\n", PTHREAD_WOFFSET); |
772 | printk("PTHREAD_WMASK : %016lX\n", PTHREAD_WMASK); |
773 | printk("NPTHREAD_WOFFSET : %016lX\n", NPTHREAD_WOFFSET); |
774 | printk("NPTHREAD_WMASK : %016lX\n", NPTHREAD_WMASK); |
775 | printk("WRITER_MUTEX : %016lX\n", WRITER_MUTEX); |
776 | printk("SOFTIRQ_WMASK : %016lX\n", SOFTIRQ_WMASK); |
777 | printk("HARDIRQ_WMASK : %016lX\n", HARDIRQ_WMASK); |
f0a36bb1 |
778 | |
779 | return 0; |
780 | } |
781 | |
782 | void cleanup_module(void) |
783 | { |
0e0fdeb6 |
784 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
785 | } |
786 | |
787 | MODULE_LICENSE("GPL"); |
788 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
789 | MODULE_DESCRIPTION("wbias rwlock test"); |