0e0fdeb6 |
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 | |
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 |
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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 | */ |
292f0110 |
56 | #define TEST_PREEMPT 1 |
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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 | */ |
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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]; |
1f5845d5 |
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 |
992fbe0f |
149 | #define wrap_write_lock() wbias_write_lock_atomic(&wbiasrwlock) |
150 | #define wrap_write_unlock() wbias_write_unlock_atomic(&wbiasrwlock) |
151 | #define wrap_write_trylock_else_subscribe() \ |
152 | wbias_write_trylock_atomic_else_subscribe(&wbiasrwlock) |
153 | #define wrap_write_trylock_subscribed() \ |
154 | wbias_write_trylock_atomic_subscribed(&wbiasrwlock) |
155 | #endif |
cd7cf33d |
156 | #endif |
157 | |
158 | #endif |
159 | |
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160 | static cycles_t cycles_calibration_min, |
161 | cycles_calibration_avg, |
162 | cycles_calibration_max; |
163 | |
164 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
165 | { |
166 | return cycles - cycles_calibration_avg; |
167 | } |
168 | |
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169 | struct proc_dir_entry *pentry = NULL; |
170 | |
b37c9208 |
171 | static int p_or_np_reader_thread(const char *typename, |
172 | void *data, int preemptable) |
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173 | { |
174 | int i; |
175 | int prev, cur; |
176 | unsigned long iter = 0; |
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177 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
178 | delayavg = 0; |
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179 | |
b37c9208 |
180 | printk("%s/%lu runnning\n", typename, (unsigned long)data); |
f0a36bb1 |
181 | do { |
182 | iter++; |
1f5845d5 |
183 | if (!preemptable) |
184 | preempt_disable(); |
68f25f81 |
185 | rdtsc_barrier(); |
7f563886 |
186 | time1 = get_cycles(); |
68f25f81 |
187 | rdtsc_barrier(); |
188 | |
1f5845d5 |
189 | if (!preemptable) |
190 | wrap_read_lock_inatomic(); |
191 | else |
192 | wrap_read_lock(); |
68f25f81 |
193 | |
194 | rdtsc_barrier(); |
7f563886 |
195 | time2 = get_cycles(); |
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196 | rdtsc_barrier(); |
197 | delay = time2 - time1; |
198 | delaymax = max(delaymax, delay); |
199 | delaymin = min(delaymin, delay); |
200 | delayavg += delay; |
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201 | prev = var[0]; |
202 | for (i = 1; i < NR_VARS; i++) { |
203 | cur = var[i]; |
204 | if (cur != prev) |
205 | printk(KERN_ALERT |
206 | "Unequal cur %d/prev %d at i %d, iter %lu " |
207 | "in thread\n", cur, prev, i, iter); |
208 | } |
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209 | |
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210 | if (!preemptable) |
211 | wrap_read_unlock_inatomic(); |
212 | else |
213 | wrap_read_unlock(); |
214 | if (!preemptable) |
215 | preempt_enable(); |
4fd25765 |
216 | if (THREAD_READER_DELAY) |
217 | msleep(THREAD_READER_DELAY); |
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218 | } while (!kthread_should_stop()); |
4fd25765 |
219 | if (!iter) { |
b37c9208 |
220 | printk("%s/%lu iterations : %lu", typename, |
4fd25765 |
221 | (unsigned long)data, iter); |
222 | } else { |
223 | delayavg /= iter; |
b37c9208 |
224 | printk("%s/%lu iterations : %lu, " |
4fd25765 |
225 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
b37c9208 |
226 | typename, |
4fd25765 |
227 | (unsigned long)data, iter, |
228 | calibrate_cycles(delaymin), |
229 | calibrate_cycles(delayavg), |
230 | calibrate_cycles(delaymax)); |
231 | } |
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232 | return 0; |
233 | } |
234 | |
1f5845d5 |
235 | static int preader_thread(void *data) |
236 | { |
b37c9208 |
237 | return p_or_np_reader_thread("preader_thread", data, 1); |
1f5845d5 |
238 | } |
239 | |
240 | static int npreader_thread(void *data) |
241 | { |
b37c9208 |
242 | return p_or_np_reader_thread("npreader_thread", data, 0); |
1f5845d5 |
243 | } |
244 | |
1c21e42c |
245 | static int trylock_reader_thread(void *data) |
246 | { |
247 | int i; |
248 | int prev, cur; |
249 | unsigned long iter = 0, success_iter = 0; |
250 | |
251 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
252 | do { |
cd7cf33d |
253 | while (!wrap_read_trylock()) |
1c21e42c |
254 | iter++; |
255 | success_iter++; |
256 | prev = var[0]; |
257 | for (i = 1; i < NR_VARS; i++) { |
258 | cur = var[i]; |
259 | if (cur != prev) |
260 | printk(KERN_ALERT |
261 | "Unequal cur %d/prev %d at i %d, iter %lu " |
262 | "in thread\n", cur, prev, i, iter); |
263 | } |
cd7cf33d |
264 | wrap_read_unlock(); |
4fd25765 |
265 | if (THREAD_READER_DELAY) |
266 | msleep(THREAD_READER_DELAY); |
1c21e42c |
267 | } while (!kthread_should_stop()); |
268 | printk("trylock_reader_thread/%lu iterations : %lu, " |
269 | "successful iterations : %lu\n", |
270 | (unsigned long)data, iter, success_iter); |
271 | return 0; |
272 | } |
273 | |
68f25f81 |
274 | DEFINE_PER_CPU(cycles_t, int_delaymin); |
275 | DEFINE_PER_CPU(cycles_t, int_delayavg); |
7f563886 |
276 | DEFINE_PER_CPU(cycles_t, int_delaymax); |
68f25f81 |
277 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
278 | |
f0a36bb1 |
279 | static void interrupt_reader_ipi(void *data) |
280 | { |
281 | int i; |
282 | int prev, cur; |
7f563886 |
283 | cycles_t time1, time2; |
68f25f81 |
284 | cycles_t *delaymax, *delaymin, *delayavg, *ipi_nr, delay; |
7f563886 |
285 | |
286 | /* |
287 | * Skip the ipi caller, not in irq context. |
288 | */ |
289 | if (!in_irq()) |
290 | return; |
f0a36bb1 |
291 | |
7f563886 |
292 | delaymax = &per_cpu(int_delaymax, smp_processor_id()); |
68f25f81 |
293 | delaymin = &per_cpu(int_delaymin, smp_processor_id()); |
294 | delayavg = &per_cpu(int_delayavg, smp_processor_id()); |
295 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
296 | |
297 | rdtsc_barrier(); |
7f563886 |
298 | time1 = get_cycles(); |
68f25f81 |
299 | rdtsc_barrier(); |
300 | |
cd7cf33d |
301 | wrap_read_lock_irq(); |
68f25f81 |
302 | |
303 | rdtsc_barrier(); |
7f563886 |
304 | time2 = get_cycles(); |
68f25f81 |
305 | rdtsc_barrier(); |
306 | delay = time2 - time1; |
307 | *delaymax = max(*delaymax, delay); |
308 | *delaymin = min(*delaymin, delay); |
309 | *delayavg += delay; |
310 | (*ipi_nr)++; |
f0a36bb1 |
311 | prev = var[0]; |
312 | for (i = 1; i < NR_VARS; i++) { |
313 | cur = var[i]; |
314 | if (cur != prev) |
315 | printk(KERN_ALERT |
316 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
317 | cur, prev, i); |
318 | } |
cd7cf33d |
319 | wrap_read_unlock_irq(); |
f0a36bb1 |
320 | } |
321 | |
1c21e42c |
322 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
323 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
324 | |
325 | static void trylock_interrupt_reader_ipi(void *data) |
326 | { |
327 | int i; |
328 | int prev, cur; |
329 | |
330 | /* |
331 | * Skip the ipi caller, not in irq context. |
332 | */ |
333 | if (!in_irq()) |
334 | return; |
335 | |
336 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
337 | while (!wrap_read_trylock_irq()) |
1c21e42c |
338 | per_cpu(trylock_int_iter, smp_processor_id())++; |
339 | per_cpu(trylock_int_success, smp_processor_id())++; |
340 | prev = var[0]; |
341 | for (i = 1; i < NR_VARS; i++) { |
342 | cur = var[i]; |
343 | if (cur != prev) |
344 | printk(KERN_ALERT |
345 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
346 | cur, prev, i); |
347 | } |
cd7cf33d |
348 | wrap_read_unlock_irq(); |
1c21e42c |
349 | } |
350 | |
351 | |
f0a36bb1 |
352 | static int interrupt_reader_thread(void *data) |
353 | { |
354 | unsigned long iter = 0; |
7f563886 |
355 | int i; |
356 | |
68f25f81 |
357 | for_each_online_cpu(i) { |
358 | per_cpu(int_delaymax, i) = 0; |
359 | per_cpu(int_delaymin, i) = ULLONG_MAX; |
360 | per_cpu(int_delayavg, i) = 0; |
361 | per_cpu(int_ipi_nr, i) = 0; |
362 | } |
f0a36bb1 |
363 | do { |
364 | iter++; |
365 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
366 | if (INTERRUPT_READER_DELAY) |
367 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
368 | } while (!kthread_should_stop()); |
369 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
370 | (unsigned long)data, iter); |
7f563886 |
371 | for_each_online_cpu(i) { |
4fd25765 |
372 | if (!per_cpu(int_ipi_nr, i)) |
373 | continue; |
68f25f81 |
374 | per_cpu(int_delayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
375 | printk("interrupt readers on CPU %i, " |
68f25f81 |
376 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
377 | i, |
378 | calibrate_cycles(per_cpu(int_delaymin, i)), |
379 | calibrate_cycles(per_cpu(int_delayavg, i)), |
380 | calibrate_cycles(per_cpu(int_delaymax, i))); |
7f563886 |
381 | } |
f0a36bb1 |
382 | return 0; |
383 | } |
384 | |
1c21e42c |
385 | static int trylock_interrupt_reader_thread(void *data) |
386 | { |
387 | unsigned long iter = 0; |
388 | int i; |
389 | |
390 | do { |
391 | iter++; |
392 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
393 | if (INTERRUPT_READER_DELAY) |
394 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
395 | } while (!kthread_should_stop()); |
396 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
397 | (unsigned long)data, iter); |
398 | for_each_online_cpu(i) { |
399 | printk("trylock interrupt readers on CPU %i, " |
400 | "iterations %lu, " |
401 | "successful iterations : %lu\n", |
402 | i, per_cpu(trylock_int_iter, i), |
403 | per_cpu(trylock_int_success, i)); |
68f25f81 |
404 | per_cpu(trylock_int_iter, i) = 0; |
405 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
406 | } |
407 | return 0; |
408 | } |
409 | |
f0a36bb1 |
410 | static int writer_thread(void *data) |
411 | { |
412 | int i; |
413 | int new; |
414 | unsigned long iter = 0; |
68f25f81 |
415 | cycles_t time1, time2, delay, delaymax = 0, delaymin = ULLONG_MAX, |
416 | delayavg = 0; |
f0a36bb1 |
417 | |
418 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
419 | do { |
420 | iter++; |
ae4a4ebf |
421 | //preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
422 | rdtsc_barrier(); |
7f563886 |
423 | time1 = get_cycles(); |
68f25f81 |
424 | rdtsc_barrier(); |
425 | |
cd7cf33d |
426 | wrap_write_lock(); |
68f25f81 |
427 | |
428 | rdtsc_barrier(); |
7f563886 |
429 | time2 = get_cycles(); |
68f25f81 |
430 | rdtsc_barrier(); |
431 | delay = time2 - time1; |
432 | delaymax = max(delaymax, delay); |
433 | delaymin = min(delaymin, delay); |
434 | delayavg += delay; |
f0a36bb1 |
435 | new = (int)get_cycles(); |
436 | for (i = 0; i < NR_VARS; i++) { |
437 | var[i] = new; |
438 | } |
cd7cf33d |
439 | |
440 | wrap_write_unlock(); |
441 | |
ae4a4ebf |
442 | //preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
443 | if (WRITER_DELAY > 0) |
4d1751f9 |
444 | udelay(WRITER_DELAY); |
f0a36bb1 |
445 | } while (!kthread_should_stop()); |
68f25f81 |
446 | delayavg /= iter; |
7f563886 |
447 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
448 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
449 | (unsigned long)data, iter, |
450 | calibrate_cycles(delaymin), |
451 | calibrate_cycles(delayavg), |
452 | calibrate_cycles(delaymax)); |
f0a36bb1 |
453 | return 0; |
454 | } |
455 | |
cd7cf33d |
456 | #if (TEST_STD_RWLOCK) |
457 | static int trylock_writer_thread(void *data) |
458 | { |
459 | int i; |
460 | int new; |
461 | unsigned long iter = 0, success = 0, fail = 0; |
462 | |
463 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
464 | do { |
465 | #if (TEST_INTERRUPTS) |
466 | /* std write trylock cannot disable interrupts. */ |
467 | local_irq_disable(); |
468 | #endif |
469 | |
470 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
471 | for (;;) { |
472 | iter++; |
473 | if (write_trylock(&std_rw_lock)) |
474 | goto locked; |
475 | } |
476 | #else |
477 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
478 | iter++; |
479 | if (write_trylock(&std_rw_lock)) |
480 | goto locked; |
481 | } |
482 | #endif |
483 | fail++; |
484 | #if (TEST_INTERRUPTS) |
485 | local_irq_enable(); |
486 | #endif |
487 | goto loop; |
488 | locked: |
489 | success++; |
490 | new = (int)get_cycles(); |
491 | for (i = 0; i < NR_VARS; i++) { |
492 | var[i] = new; |
493 | } |
494 | #if (TEST_INTERRUPTS) |
495 | write_unlock_irq(&std_rw_lock); |
496 | #else |
497 | write_unlock(&std_rw_lock); |
498 | #endif |
499 | loop: |
500 | if (TRYLOCK_WRITER_DELAY > 0) |
501 | udelay(TRYLOCK_WRITER_DELAY); |
502 | } while (!kthread_should_stop()); |
503 | printk("trylock_writer_thread/%lu iterations : " |
504 | "[try,success,fail after %d try], " |
505 | "%lu,%lu,%lu\n", |
506 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
507 | iter, success, fail); |
508 | return 0; |
509 | } |
510 | |
511 | #else /* !TEST_STD_RWLOCK */ |
512 | |
1c21e42c |
513 | static int trylock_writer_thread(void *data) |
514 | { |
515 | int i; |
516 | int new; |
4fd25765 |
517 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
518 | |
519 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
520 | do { |
4fd25765 |
521 | iter++; |
992fbe0f |
522 | if (wrap_write_trylock_else_subscribe()) |
4fd25765 |
523 | goto locked; |
cd7cf33d |
524 | |
4fd25765 |
525 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
526 | for (;;) { |
1c21e42c |
527 | iter++; |
992fbe0f |
528 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
529 | goto locked; |
1c21e42c |
530 | } |
4fd25765 |
531 | #else |
cd7cf33d |
532 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
533 | iter++; |
992fbe0f |
534 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
535 | goto locked; |
536 | } |
537 | #endif |
538 | fail++; |
0e0fdeb6 |
539 | wbias_write_unsubscribe(&wbiasrwlock); |
4fd25765 |
540 | goto loop; |
541 | locked: |
1c21e42c |
542 | success++; |
1c21e42c |
543 | new = (int)get_cycles(); |
544 | for (i = 0; i < NR_VARS; i++) { |
545 | var[i] = new; |
546 | } |
992fbe0f |
547 | wrap_write_unlock(); |
4fd25765 |
548 | loop: |
549 | if (TRYLOCK_WRITER_DELAY > 0) |
550 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
551 | } while (!kthread_should_stop()); |
4fd25765 |
552 | printk("trylock_writer_thread/%lu iterations : " |
553 | "[try,success,fail after %d try], " |
554 | "%lu,%lu,%lu\n", |
555 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
556 | iter, success, fail); |
1c21e42c |
557 | return 0; |
558 | } |
559 | |
cd7cf33d |
560 | #endif /* TEST_STD_RWLOCK */ |
561 | |
0e0fdeb6 |
562 | static void wbias_rwlock_create(void) |
f0a36bb1 |
563 | { |
564 | unsigned long i; |
565 | |
1f5845d5 |
566 | for (i = 0; i < NR_PREADERS; i++) { |
567 | printk("starting preemptable reader thread %lu\n", i); |
568 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
569 | "wbiasrwlock_preader"); |
570 | BUG_ON(!preader_threads[i]); |
571 | } |
572 | |
573 | for (i = 0; i < NR_NPREADERS; i++) { |
574 | printk("starting non-preemptable reader thread %lu\n", i); |
575 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
576 | "wbiasrwlock_npreader"); |
577 | BUG_ON(!npreader_threads[i]); |
f0a36bb1 |
578 | } |
579 | |
1c21e42c |
580 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
581 | printk("starting trylock reader thread %lu\n", i); |
582 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
0e0fdeb6 |
583 | (void *)i, "wbiasrwlock_trylock_reader"); |
1c21e42c |
584 | BUG_ON(!trylock_reader_threads[i]); |
585 | } |
4fd25765 |
586 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
587 | printk("starting interrupt reader %lu\n", i); |
588 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
589 | (void *)i, |
0e0fdeb6 |
590 | "wbiasrwlock_interrupt_reader"); |
4fd25765 |
591 | } |
592 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
593 | printk("starting trylock interrupt reader %lu\n", i); |
594 | trylock_interrupt_reader[i] = |
595 | kthread_run(trylock_interrupt_reader_thread, |
0e0fdeb6 |
596 | (void *)i, "wbiasrwlock_trylock_interrupt_reader"); |
4fd25765 |
597 | } |
f0a36bb1 |
598 | for (i = 0; i < NR_WRITERS; i++) { |
599 | printk("starting writer thread %lu\n", i); |
600 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
0e0fdeb6 |
601 | "wbiasrwlock_writer"); |
f0a36bb1 |
602 | BUG_ON(!writer_threads[i]); |
603 | } |
1c21e42c |
604 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
605 | printk("starting trylock writer thread %lu\n", i); |
606 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
0e0fdeb6 |
607 | (void *)i, "wbiasrwlock_trylock_writer"); |
1c21e42c |
608 | BUG_ON(!trylock_writer_threads[i]); |
609 | } |
f0a36bb1 |
610 | } |
611 | |
0e0fdeb6 |
612 | static void wbias_rwlock_stop(void) |
f0a36bb1 |
613 | { |
614 | unsigned long i; |
615 | |
1c21e42c |
616 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
617 | kthread_stop(writer_threads[i]); |
1c21e42c |
618 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
619 | kthread_stop(trylock_writer_threads[i]); |
1f5845d5 |
620 | for (i = 0; i < NR_NPREADERS; i++) |
621 | kthread_stop(npreader_threads[i]); |
622 | for (i = 0; i < NR_PREADERS; i++) |
623 | kthread_stop(preader_threads[i]); |
1c21e42c |
624 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
625 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
626 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
627 | kthread_stop(interrupt_reader[i]); |
628 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
629 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
630 | } |
631 | |
632 | |
633 | static void perform_test(const char *name, void (*callback)(void)) |
634 | { |
635 | printk("%s\n", name); |
636 | callback(); |
637 | } |
638 | |
639 | static int my_open(struct inode *inode, struct file *file) |
640 | { |
68f25f81 |
641 | unsigned long i; |
642 | cycles_t time1, time2, delay; |
643 | |
644 | printk("** get_cycles calibration **\n"); |
645 | cycles_calibration_min = ULLONG_MAX; |
646 | cycles_calibration_avg = 0; |
647 | cycles_calibration_max = 0; |
648 | |
649 | local_irq_disable(); |
650 | for (i = 0; i < 10; i++) { |
651 | rdtsc_barrier(); |
652 | time1 = get_cycles(); |
653 | rdtsc_barrier(); |
654 | rdtsc_barrier(); |
655 | time2 = get_cycles(); |
656 | rdtsc_barrier(); |
657 | delay = time2 - time1; |
658 | cycles_calibration_min = min(cycles_calibration_min, delay); |
659 | cycles_calibration_avg += delay; |
660 | cycles_calibration_max = max(cycles_calibration_max, delay); |
661 | } |
662 | cycles_calibration_avg /= 10; |
663 | local_irq_enable(); |
664 | |
665 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
666 | "results calibrated on avg\n", |
667 | cycles_calibration_min, |
668 | cycles_calibration_avg, |
669 | cycles_calibration_max); |
193771da |
670 | printk("\n"); |
68f25f81 |
671 | |
672 | printk("** Single writer test, no contention **\n"); |
dac86829 |
673 | wbias_rwlock_profile_latency_reset(); |
68f25f81 |
674 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
675 | "wbiasrwlock_writer"); |
68f25f81 |
676 | BUG_ON(!writer_threads[0]); |
677 | ssleep(SINGLE_WRITER_TEST_DURATION); |
678 | kthread_stop(writer_threads[0]); |
193771da |
679 | printk("\n"); |
68f25f81 |
680 | |
dac86829 |
681 | wbias_rwlock_profile_latency_print(); |
682 | |
4fd25765 |
683 | printk("** Single trylock writer test, no contention **\n"); |
dac86829 |
684 | wbias_rwlock_profile_latency_reset(); |
4fd25765 |
685 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
686 | (void *)0, |
0e0fdeb6 |
687 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
688 | BUG_ON(!trylock_writer_threads[0]); |
689 | ssleep(SINGLE_WRITER_TEST_DURATION); |
690 | kthread_stop(trylock_writer_threads[0]); |
193771da |
691 | printk("\n"); |
4fd25765 |
692 | |
dac86829 |
693 | wbias_rwlock_profile_latency_print(); |
694 | |
1f5845d5 |
695 | printk("** Single preemptable reader test, no contention **\n"); |
696 | wbias_rwlock_profile_latency_reset(); |
697 | preader_threads[0] = kthread_run(preader_thread, (void *)0, |
698 | "wbiasrwlock_preader"); |
699 | BUG_ON(!preader_threads[0]); |
700 | ssleep(SINGLE_READER_TEST_DURATION); |
701 | kthread_stop(preader_threads[0]); |
702 | printk("\n"); |
703 | |
704 | wbias_rwlock_profile_latency_print(); |
705 | |
292f0110 |
706 | #if (TEST_PREEMPT) |
1f5845d5 |
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(); |
292f0110 |
717 | #endif |
dac86829 |
718 | |
1f5845d5 |
719 | printk("** Multiple p/non-p readers test, no contention **\n"); |
dac86829 |
720 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
721 | for (i = 0; i < NR_PREADERS; i++) { |
722 | printk("starting preader thread %lu\n", i); |
723 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
724 | "wbiasrwlock_preader"); |
725 | BUG_ON(!preader_threads[i]); |
726 | } |
727 | for (i = 0; i < NR_NPREADERS; i++) { |
728 | printk("starting npreader thread %lu\n", i); |
729 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
730 | "wbiasrwlock_npreader"); |
731 | BUG_ON(!npreader_threads[i]); |
68f25f81 |
732 | } |
733 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
734 | for (i = 0; i < NR_NPREADERS; i++) |
735 | kthread_stop(npreader_threads[i]); |
736 | for (i = 0; i < NR_PREADERS; i++) |
737 | kthread_stop(preader_threads[i]); |
193771da |
738 | printk("\n"); |
68f25f81 |
739 | |
dac86829 |
740 | wbias_rwlock_profile_latency_print(); |
741 | |
68f25f81 |
742 | printk("** High contention test **\n"); |
dac86829 |
743 | wbias_rwlock_profile_latency_reset(); |
0e0fdeb6 |
744 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
745 | ssleep(TEST_DURATION); |
0e0fdeb6 |
746 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
193771da |
747 | printk("\n"); |
dac86829 |
748 | wbias_rwlock_profile_latency_print(); |
f0a36bb1 |
749 | |
750 | return -EPERM; |
751 | } |
752 | |
753 | |
754 | static struct file_operations my_operations = { |
755 | .open = my_open, |
756 | }; |
757 | |
758 | int init_module(void) |
759 | { |
0e0fdeb6 |
760 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
761 | if (pentry) |
762 | pentry->proc_fops = &my_operations; |
763 | |
d1f36a28 |
764 | printk("PTHREAD_ROFFSET : %016lX\n", PTHREAD_ROFFSET); |
765 | printk("PTHREAD_RMASK : %016lX\n", PTHREAD_RMASK); |
766 | printk("NPTHREAD_ROFFSET : %016lX\n", NPTHREAD_ROFFSET); |
767 | printk("NPTHREAD_RMASK : %016lX\n", NPTHREAD_RMASK); |
768 | printk("SOFTIRQ_ROFFSET : %016lX\n", SOFTIRQ_ROFFSET); |
769 | printk("SOFTIRQ_RMASK : %016lX\n", SOFTIRQ_RMASK); |
770 | printk("HARDIRQ_ROFFSET : %016lX\n", HARDIRQ_ROFFSET); |
771 | printk("HARDIRQ_RMASK : %016lX\n", HARDIRQ_RMASK); |
772 | printk("PTHREAD_WOFFSET : %016lX\n", PTHREAD_WOFFSET); |
773 | printk("PTHREAD_WMASK : %016lX\n", PTHREAD_WMASK); |
774 | printk("NPTHREAD_WOFFSET : %016lX\n", NPTHREAD_WOFFSET); |
775 | printk("NPTHREAD_WMASK : %016lX\n", NPTHREAD_WMASK); |
776 | printk("WRITER_MUTEX : %016lX\n", WRITER_MUTEX); |
777 | printk("SOFTIRQ_WMASK : %016lX\n", SOFTIRQ_WMASK); |
778 | printk("HARDIRQ_WMASK : %016lX\n", HARDIRQ_WMASK); |
f0a36bb1 |
779 | |
780 | return 0; |
781 | } |
782 | |
783 | void cleanup_module(void) |
784 | { |
0e0fdeb6 |
785 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
786 | } |
787 | |
788 | MODULE_LICENSE("GPL"); |
789 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
790 | MODULE_DESCRIPTION("wbias rwlock test"); |