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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 | */ |
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]; |
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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 | |
1f5845d5 |
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 | |
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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) |
5b23bc48 |
140 | #define wrap_write_unsubscribe() \ |
141 | wbias_write_unsubscribe_irq(&wbiasrwlock) |
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142 | #else |
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143 | #if (TEST_PREEMPT) |
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144 | #define wrap_write_lock() wbias_write_lock(&wbiasrwlock) |
145 | #define wrap_write_unlock() wbias_write_unlock(&wbiasrwlock) |
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146 | #define wrap_write_trylock_else_subscribe() \ |
147 | wbias_write_trylock_else_subscribe(&wbiasrwlock) |
148 | #define wrap_write_trylock_subscribed() \ |
149 | wbias_write_trylock_subscribed(&wbiasrwlock) |
5b23bc48 |
150 | #define wrap_write_unsubscribe() \ |
151 | wbias_write_unsubscribe(&wbiasrwlock) |
992fbe0f |
152 | #else |
992fbe0f |
153 | #define wrap_write_lock() wbias_write_lock_atomic(&wbiasrwlock) |
154 | #define wrap_write_unlock() wbias_write_unlock_atomic(&wbiasrwlock) |
155 | #define wrap_write_trylock_else_subscribe() \ |
156 | wbias_write_trylock_atomic_else_subscribe(&wbiasrwlock) |
157 | #define wrap_write_trylock_subscribed() \ |
158 | wbias_write_trylock_atomic_subscribed(&wbiasrwlock) |
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159 | #define wrap_write_unsubscribe() \ |
160 | wbias_write_unsubscribe_atomic(&wbiasrwlock) |
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161 | #endif |
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162 | #endif |
163 | |
164 | #endif |
165 | |
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166 | static cycles_t cycles_calibration_min, |
167 | cycles_calibration_avg, |
168 | cycles_calibration_max; |
169 | |
170 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
171 | { |
172 | return cycles - cycles_calibration_avg; |
173 | } |
174 | |
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175 | struct proc_dir_entry *pentry = NULL; |
176 | |
b37c9208 |
177 | static int p_or_np_reader_thread(const char *typename, |
178 | void *data, int preemptable) |
f0a36bb1 |
179 | { |
180 | int i; |
181 | int prev, cur; |
182 | unsigned long iter = 0; |
5b23bc48 |
183 | cycles_t time1, time2, delay; |
184 | cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0; |
185 | cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0; |
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186 | |
b37c9208 |
187 | printk("%s/%lu runnning\n", typename, (unsigned long)data); |
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188 | do { |
189 | iter++; |
1f5845d5 |
190 | if (!preemptable) |
191 | preempt_disable(); |
68f25f81 |
192 | rdtsc_barrier(); |
7f563886 |
193 | time1 = get_cycles(); |
68f25f81 |
194 | rdtsc_barrier(); |
195 | |
1f5845d5 |
196 | if (!preemptable) |
197 | wrap_read_lock_inatomic(); |
198 | else |
199 | wrap_read_lock(); |
68f25f81 |
200 | |
201 | rdtsc_barrier(); |
7f563886 |
202 | time2 = get_cycles(); |
68f25f81 |
203 | rdtsc_barrier(); |
204 | delay = time2 - time1; |
5b23bc48 |
205 | ldelaymax = max(ldelaymax, delay); |
206 | ldelaymin = min(ldelaymin, delay); |
207 | ldelayavg += delay; |
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208 | prev = var[0]; |
209 | for (i = 1; i < NR_VARS; i++) { |
210 | cur = var[i]; |
211 | if (cur != prev) |
212 | printk(KERN_ALERT |
213 | "Unequal cur %d/prev %d at i %d, iter %lu " |
214 | "in thread\n", cur, prev, i, iter); |
215 | } |
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216 | |
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217 | rdtsc_barrier(); |
218 | time1 = get_cycles(); |
219 | rdtsc_barrier(); |
220 | |
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221 | if (!preemptable) |
222 | wrap_read_unlock_inatomic(); |
223 | else |
224 | wrap_read_unlock(); |
5b23bc48 |
225 | rdtsc_barrier(); |
226 | time2 = get_cycles(); |
227 | rdtsc_barrier(); |
228 | delay = time2 - time1; |
229 | udelaymax = max(udelaymax, delay); |
230 | udelaymin = min(udelaymin, delay); |
231 | udelayavg += delay; |
232 | |
1f5845d5 |
233 | if (!preemptable) |
234 | preempt_enable(); |
5b23bc48 |
235 | |
4fd25765 |
236 | if (THREAD_READER_DELAY) |
237 | msleep(THREAD_READER_DELAY); |
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238 | } while (!kthread_should_stop()); |
4fd25765 |
239 | if (!iter) { |
b37c9208 |
240 | printk("%s/%lu iterations : %lu", typename, |
4fd25765 |
241 | (unsigned long)data, iter); |
242 | } else { |
5b23bc48 |
243 | ldelayavg /= iter; |
244 | udelayavg /= iter; |
b37c9208 |
245 | printk("%s/%lu iterations : %lu, " |
4fd25765 |
246 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
b37c9208 |
247 | typename, |
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248 | (unsigned long)data, iter, |
5b23bc48 |
249 | calibrate_cycles(ldelaymin), |
250 | calibrate_cycles(ldelayavg), |
251 | calibrate_cycles(ldelaymax)); |
252 | printk("%s/%lu iterations : %lu, " |
253 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
254 | typename, |
255 | (unsigned long)data, iter, |
256 | calibrate_cycles(udelaymin), |
257 | calibrate_cycles(udelayavg), |
258 | calibrate_cycles(udelaymax)); |
4fd25765 |
259 | } |
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260 | return 0; |
261 | } |
262 | |
1f5845d5 |
263 | static int preader_thread(void *data) |
264 | { |
b37c9208 |
265 | return p_or_np_reader_thread("preader_thread", data, 1); |
1f5845d5 |
266 | } |
267 | |
268 | static int npreader_thread(void *data) |
269 | { |
b37c9208 |
270 | return p_or_np_reader_thread("npreader_thread", data, 0); |
1f5845d5 |
271 | } |
272 | |
1c21e42c |
273 | static int trylock_reader_thread(void *data) |
274 | { |
275 | int i; |
276 | int prev, cur; |
277 | unsigned long iter = 0, success_iter = 0; |
278 | |
279 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
280 | do { |
cd7cf33d |
281 | while (!wrap_read_trylock()) |
1c21e42c |
282 | iter++; |
283 | success_iter++; |
284 | prev = var[0]; |
285 | for (i = 1; i < NR_VARS; i++) { |
286 | cur = var[i]; |
287 | if (cur != prev) |
288 | printk(KERN_ALERT |
289 | "Unequal cur %d/prev %d at i %d, iter %lu " |
290 | "in thread\n", cur, prev, i, iter); |
291 | } |
cd7cf33d |
292 | wrap_read_unlock(); |
4fd25765 |
293 | if (THREAD_READER_DELAY) |
294 | msleep(THREAD_READER_DELAY); |
1c21e42c |
295 | } while (!kthread_should_stop()); |
296 | printk("trylock_reader_thread/%lu iterations : %lu, " |
297 | "successful iterations : %lu\n", |
298 | (unsigned long)data, iter, success_iter); |
299 | return 0; |
300 | } |
301 | |
5b23bc48 |
302 | DEFINE_PER_CPU(cycles_t, int_ldelaymin); |
303 | DEFINE_PER_CPU(cycles_t, int_ldelayavg); |
304 | DEFINE_PER_CPU(cycles_t, int_ldelaymax); |
305 | DEFINE_PER_CPU(cycles_t, int_udelaymin); |
306 | DEFINE_PER_CPU(cycles_t, int_udelayavg); |
307 | DEFINE_PER_CPU(cycles_t, int_udelaymax); |
68f25f81 |
308 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
309 | |
f0a36bb1 |
310 | static void interrupt_reader_ipi(void *data) |
311 | { |
312 | int i; |
313 | int prev, cur; |
7f563886 |
314 | cycles_t time1, time2; |
5b23bc48 |
315 | cycles_t *ldelaymax, *ldelaymin, *ldelayavg, *ipi_nr, delay; |
316 | cycles_t *udelaymax, *udelaymin, *udelayavg; |
7f563886 |
317 | |
318 | /* |
319 | * Skip the ipi caller, not in irq context. |
320 | */ |
321 | if (!in_irq()) |
322 | return; |
f0a36bb1 |
323 | |
5b23bc48 |
324 | ldelaymax = &per_cpu(int_ldelaymax, smp_processor_id()); |
325 | ldelaymin = &per_cpu(int_ldelaymin, smp_processor_id()); |
326 | ldelayavg = &per_cpu(int_ldelayavg, smp_processor_id()); |
327 | udelaymax = &per_cpu(int_udelaymax, smp_processor_id()); |
328 | udelaymin = &per_cpu(int_udelaymin, smp_processor_id()); |
329 | udelayavg = &per_cpu(int_udelayavg, smp_processor_id()); |
68f25f81 |
330 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
331 | |
332 | rdtsc_barrier(); |
7f563886 |
333 | time1 = get_cycles(); |
68f25f81 |
334 | rdtsc_barrier(); |
335 | |
cd7cf33d |
336 | wrap_read_lock_irq(); |
68f25f81 |
337 | |
338 | rdtsc_barrier(); |
7f563886 |
339 | time2 = get_cycles(); |
68f25f81 |
340 | rdtsc_barrier(); |
341 | delay = time2 - time1; |
5b23bc48 |
342 | *ldelaymax = max(*ldelaymax, delay); |
343 | *ldelaymin = min(*ldelaymin, delay); |
344 | *ldelayavg += delay; |
68f25f81 |
345 | (*ipi_nr)++; |
f0a36bb1 |
346 | prev = var[0]; |
347 | for (i = 1; i < NR_VARS; i++) { |
348 | cur = var[i]; |
349 | if (cur != prev) |
350 | printk(KERN_ALERT |
351 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
352 | cur, prev, i); |
353 | } |
5b23bc48 |
354 | rdtsc_barrier(); |
355 | time1 = get_cycles(); |
356 | rdtsc_barrier(); |
cd7cf33d |
357 | wrap_read_unlock_irq(); |
5b23bc48 |
358 | time2 = get_cycles(); |
359 | rdtsc_barrier(); |
360 | delay = time2 - time1; |
361 | *udelaymax = max(*udelaymax, delay); |
362 | *udelaymin = min(*udelaymin, delay); |
363 | *udelayavg += delay; |
f0a36bb1 |
364 | } |
365 | |
1c21e42c |
366 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
367 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
368 | |
369 | static void trylock_interrupt_reader_ipi(void *data) |
370 | { |
371 | int i; |
372 | int prev, cur; |
373 | |
374 | /* |
375 | * Skip the ipi caller, not in irq context. |
376 | */ |
377 | if (!in_irq()) |
378 | return; |
379 | |
380 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
381 | while (!wrap_read_trylock_irq()) |
1c21e42c |
382 | per_cpu(trylock_int_iter, smp_processor_id())++; |
383 | per_cpu(trylock_int_success, smp_processor_id())++; |
384 | prev = var[0]; |
385 | for (i = 1; i < NR_VARS; i++) { |
386 | cur = var[i]; |
387 | if (cur != prev) |
388 | printk(KERN_ALERT |
389 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
390 | cur, prev, i); |
391 | } |
cd7cf33d |
392 | wrap_read_unlock_irq(); |
1c21e42c |
393 | } |
394 | |
395 | |
f0a36bb1 |
396 | static int interrupt_reader_thread(void *data) |
397 | { |
398 | unsigned long iter = 0; |
7f563886 |
399 | int i; |
400 | |
68f25f81 |
401 | for_each_online_cpu(i) { |
5b23bc48 |
402 | per_cpu(int_ldelaymax, i) = 0; |
403 | per_cpu(int_ldelaymin, i) = ULLONG_MAX; |
404 | per_cpu(int_ldelayavg, i) = 0; |
405 | per_cpu(int_udelaymax, i) = 0; |
406 | per_cpu(int_udelaymin, i) = ULLONG_MAX; |
407 | per_cpu(int_udelayavg, i) = 0; |
68f25f81 |
408 | per_cpu(int_ipi_nr, i) = 0; |
409 | } |
f0a36bb1 |
410 | do { |
411 | iter++; |
412 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
413 | if (INTERRUPT_READER_DELAY) |
414 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
415 | } while (!kthread_should_stop()); |
416 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
417 | (unsigned long)data, iter); |
7f563886 |
418 | for_each_online_cpu(i) { |
4fd25765 |
419 | if (!per_cpu(int_ipi_nr, i)) |
420 | continue; |
68f25f81 |
421 | per_cpu(int_delayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
422 | printk("interrupt readers on CPU %i, " |
68f25f81 |
423 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
424 | i, |
5b23bc48 |
425 | calibrate_cycles(per_cpu(int_ldelaymin, i)), |
426 | calibrate_cycles(per_cpu(int_ldelayavg, i)), |
427 | calibrate_cycles(per_cpu(int_ldelaymax, i))); |
428 | printk("interrupt readers on CPU %i, " |
429 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
430 | i, |
431 | calibrate_cycles(per_cpu(int_udelaymin, i)), |
432 | calibrate_cycles(per_cpu(int_udelayavg, i)), |
433 | calibrate_cycles(per_cpu(int_udelaymax, i))); |
7f563886 |
434 | } |
f0a36bb1 |
435 | return 0; |
436 | } |
437 | |
1c21e42c |
438 | static int trylock_interrupt_reader_thread(void *data) |
439 | { |
440 | unsigned long iter = 0; |
441 | int i; |
442 | |
443 | do { |
444 | iter++; |
445 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
446 | if (INTERRUPT_READER_DELAY) |
447 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
448 | } while (!kthread_should_stop()); |
449 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
450 | (unsigned long)data, iter); |
451 | for_each_online_cpu(i) { |
452 | printk("trylock interrupt readers on CPU %i, " |
453 | "iterations %lu, " |
454 | "successful iterations : %lu\n", |
455 | i, per_cpu(trylock_int_iter, i), |
456 | per_cpu(trylock_int_success, i)); |
68f25f81 |
457 | per_cpu(trylock_int_iter, i) = 0; |
458 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
459 | } |
460 | return 0; |
461 | } |
462 | |
f0a36bb1 |
463 | static int writer_thread(void *data) |
464 | { |
465 | int i; |
466 | int new; |
467 | unsigned long iter = 0; |
5b23bc48 |
468 | cycles_t time1, time2, delay; |
469 | cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0; |
470 | cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0; |
f0a36bb1 |
471 | |
472 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
473 | do { |
474 | iter++; |
ae4a4ebf |
475 | //preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
476 | rdtsc_barrier(); |
7f563886 |
477 | time1 = get_cycles(); |
68f25f81 |
478 | rdtsc_barrier(); |
479 | |
cd7cf33d |
480 | wrap_write_lock(); |
68f25f81 |
481 | |
482 | rdtsc_barrier(); |
7f563886 |
483 | time2 = get_cycles(); |
68f25f81 |
484 | rdtsc_barrier(); |
485 | delay = time2 - time1; |
5b23bc48 |
486 | ldelaymax = max(ldelaymax, delay); |
487 | ldelaymin = min(ldelaymin, delay); |
488 | ldelayavg += delay; |
f0a36bb1 |
489 | new = (int)get_cycles(); |
490 | for (i = 0; i < NR_VARS; i++) { |
491 | var[i] = new; |
492 | } |
cd7cf33d |
493 | |
5b23bc48 |
494 | rdtsc_barrier(); |
495 | time1 = get_cycles(); |
496 | rdtsc_barrier(); |
497 | |
cd7cf33d |
498 | wrap_write_unlock(); |
499 | |
5b23bc48 |
500 | rdtsc_barrier(); |
501 | time2 = get_cycles(); |
502 | rdtsc_barrier(); |
503 | delay = time2 - time1; |
504 | udelaymax = max(udelaymax, delay); |
505 | udelaymin = min(udelaymin, delay); |
506 | udelayavg += delay; |
507 | |
ae4a4ebf |
508 | //preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
509 | if (WRITER_DELAY > 0) |
4d1751f9 |
510 | udelay(WRITER_DELAY); |
f0a36bb1 |
511 | } while (!kthread_should_stop()); |
5b23bc48 |
512 | ldelayavg /= iter; |
513 | udelayavg /= iter; |
7f563886 |
514 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
515 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
516 | (unsigned long)data, iter, |
517 | calibrate_cycles(delaymin), |
518 | calibrate_cycles(delayavg), |
519 | calibrate_cycles(delaymax)); |
5b23bc48 |
520 | printk("writer_thread/%lu iterations : %lu, " |
521 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
522 | (unsigned long)data, iter, |
523 | calibrate_cycles(udelaymin), |
524 | calibrate_cycles(udelayavg), |
525 | calibrate_cycles(udelaymax)); |
f0a36bb1 |
526 | return 0; |
527 | } |
528 | |
cd7cf33d |
529 | #if (TEST_STD_RWLOCK) |
530 | static int trylock_writer_thread(void *data) |
531 | { |
532 | int i; |
533 | int new; |
534 | unsigned long iter = 0, success = 0, fail = 0; |
535 | |
536 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
537 | do { |
538 | #if (TEST_INTERRUPTS) |
539 | /* std write trylock cannot disable interrupts. */ |
540 | local_irq_disable(); |
541 | #endif |
542 | |
543 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
544 | for (;;) { |
545 | iter++; |
546 | if (write_trylock(&std_rw_lock)) |
547 | goto locked; |
548 | } |
549 | #else |
550 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
551 | iter++; |
552 | if (write_trylock(&std_rw_lock)) |
553 | goto locked; |
554 | } |
555 | #endif |
556 | fail++; |
557 | #if (TEST_INTERRUPTS) |
558 | local_irq_enable(); |
559 | #endif |
560 | goto loop; |
561 | locked: |
562 | success++; |
563 | new = (int)get_cycles(); |
564 | for (i = 0; i < NR_VARS; i++) { |
565 | var[i] = new; |
566 | } |
567 | #if (TEST_INTERRUPTS) |
568 | write_unlock_irq(&std_rw_lock); |
569 | #else |
570 | write_unlock(&std_rw_lock); |
571 | #endif |
572 | loop: |
573 | if (TRYLOCK_WRITER_DELAY > 0) |
574 | udelay(TRYLOCK_WRITER_DELAY); |
575 | } while (!kthread_should_stop()); |
576 | printk("trylock_writer_thread/%lu iterations : " |
577 | "[try,success,fail after %d try], " |
578 | "%lu,%lu,%lu\n", |
579 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
580 | iter, success, fail); |
581 | return 0; |
582 | } |
583 | |
584 | #else /* !TEST_STD_RWLOCK */ |
585 | |
1c21e42c |
586 | static int trylock_writer_thread(void *data) |
587 | { |
588 | int i; |
589 | int new; |
4fd25765 |
590 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
591 | |
592 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
593 | do { |
4fd25765 |
594 | iter++; |
992fbe0f |
595 | if (wrap_write_trylock_else_subscribe()) |
4fd25765 |
596 | goto locked; |
cd7cf33d |
597 | |
4fd25765 |
598 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
599 | for (;;) { |
1c21e42c |
600 | iter++; |
992fbe0f |
601 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
602 | goto locked; |
1c21e42c |
603 | } |
4fd25765 |
604 | #else |
cd7cf33d |
605 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
606 | iter++; |
992fbe0f |
607 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
608 | goto locked; |
609 | } |
610 | #endif |
611 | fail++; |
5b23bc48 |
612 | wrap_write_unsubscribe(); |
4fd25765 |
613 | goto loop; |
614 | locked: |
1c21e42c |
615 | success++; |
1c21e42c |
616 | new = (int)get_cycles(); |
617 | for (i = 0; i < NR_VARS; i++) { |
618 | var[i] = new; |
619 | } |
992fbe0f |
620 | wrap_write_unlock(); |
4fd25765 |
621 | loop: |
622 | if (TRYLOCK_WRITER_DELAY > 0) |
623 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
624 | } while (!kthread_should_stop()); |
4fd25765 |
625 | printk("trylock_writer_thread/%lu iterations : " |
626 | "[try,success,fail after %d try], " |
627 | "%lu,%lu,%lu\n", |
628 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
629 | iter, success, fail); |
1c21e42c |
630 | return 0; |
631 | } |
632 | |
cd7cf33d |
633 | #endif /* TEST_STD_RWLOCK */ |
634 | |
0e0fdeb6 |
635 | static void wbias_rwlock_create(void) |
f0a36bb1 |
636 | { |
637 | unsigned long i; |
638 | |
1f5845d5 |
639 | for (i = 0; i < NR_PREADERS; i++) { |
640 | printk("starting preemptable reader thread %lu\n", i); |
641 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
642 | "wbiasrwlock_preader"); |
643 | BUG_ON(!preader_threads[i]); |
644 | } |
645 | |
646 | for (i = 0; i < NR_NPREADERS; i++) { |
647 | printk("starting non-preemptable reader thread %lu\n", i); |
648 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
649 | "wbiasrwlock_npreader"); |
650 | BUG_ON(!npreader_threads[i]); |
f0a36bb1 |
651 | } |
652 | |
1c21e42c |
653 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
654 | printk("starting trylock reader thread %lu\n", i); |
655 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
0e0fdeb6 |
656 | (void *)i, "wbiasrwlock_trylock_reader"); |
1c21e42c |
657 | BUG_ON(!trylock_reader_threads[i]); |
658 | } |
4fd25765 |
659 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
660 | printk("starting interrupt reader %lu\n", i); |
661 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
662 | (void *)i, |
0e0fdeb6 |
663 | "wbiasrwlock_interrupt_reader"); |
4fd25765 |
664 | } |
665 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
666 | printk("starting trylock interrupt reader %lu\n", i); |
667 | trylock_interrupt_reader[i] = |
668 | kthread_run(trylock_interrupt_reader_thread, |
0e0fdeb6 |
669 | (void *)i, "wbiasrwlock_trylock_interrupt_reader"); |
4fd25765 |
670 | } |
f0a36bb1 |
671 | for (i = 0; i < NR_WRITERS; i++) { |
672 | printk("starting writer thread %lu\n", i); |
673 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
0e0fdeb6 |
674 | "wbiasrwlock_writer"); |
f0a36bb1 |
675 | BUG_ON(!writer_threads[i]); |
676 | } |
1c21e42c |
677 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
678 | printk("starting trylock writer thread %lu\n", i); |
679 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
0e0fdeb6 |
680 | (void *)i, "wbiasrwlock_trylock_writer"); |
1c21e42c |
681 | BUG_ON(!trylock_writer_threads[i]); |
682 | } |
f0a36bb1 |
683 | } |
684 | |
0e0fdeb6 |
685 | static void wbias_rwlock_stop(void) |
f0a36bb1 |
686 | { |
687 | unsigned long i; |
688 | |
1c21e42c |
689 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
690 | kthread_stop(writer_threads[i]); |
1c21e42c |
691 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
692 | kthread_stop(trylock_writer_threads[i]); |
1f5845d5 |
693 | for (i = 0; i < NR_NPREADERS; i++) |
694 | kthread_stop(npreader_threads[i]); |
695 | for (i = 0; i < NR_PREADERS; i++) |
696 | kthread_stop(preader_threads[i]); |
1c21e42c |
697 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
698 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
699 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
700 | kthread_stop(interrupt_reader[i]); |
701 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
702 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
703 | } |
704 | |
705 | |
706 | static void perform_test(const char *name, void (*callback)(void)) |
707 | { |
708 | printk("%s\n", name); |
709 | callback(); |
710 | } |
711 | |
712 | static int my_open(struct inode *inode, struct file *file) |
713 | { |
68f25f81 |
714 | unsigned long i; |
715 | cycles_t time1, time2, delay; |
716 | |
717 | printk("** get_cycles calibration **\n"); |
718 | cycles_calibration_min = ULLONG_MAX; |
719 | cycles_calibration_avg = 0; |
720 | cycles_calibration_max = 0; |
721 | |
722 | local_irq_disable(); |
723 | for (i = 0; i < 10; i++) { |
724 | rdtsc_barrier(); |
725 | time1 = get_cycles(); |
726 | rdtsc_barrier(); |
727 | rdtsc_barrier(); |
728 | time2 = get_cycles(); |
729 | rdtsc_barrier(); |
730 | delay = time2 - time1; |
731 | cycles_calibration_min = min(cycles_calibration_min, delay); |
732 | cycles_calibration_avg += delay; |
733 | cycles_calibration_max = max(cycles_calibration_max, delay); |
734 | } |
735 | cycles_calibration_avg /= 10; |
736 | local_irq_enable(); |
737 | |
738 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
739 | "results calibrated on avg\n", |
740 | cycles_calibration_min, |
741 | cycles_calibration_avg, |
742 | cycles_calibration_max); |
193771da |
743 | printk("\n"); |
68f25f81 |
744 | |
745 | printk("** Single writer test, no contention **\n"); |
dac86829 |
746 | wbias_rwlock_profile_latency_reset(); |
68f25f81 |
747 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
748 | "wbiasrwlock_writer"); |
68f25f81 |
749 | BUG_ON(!writer_threads[0]); |
750 | ssleep(SINGLE_WRITER_TEST_DURATION); |
751 | kthread_stop(writer_threads[0]); |
193771da |
752 | printk("\n"); |
68f25f81 |
753 | |
dac86829 |
754 | wbias_rwlock_profile_latency_print(); |
755 | |
4fd25765 |
756 | printk("** Single trylock writer test, no contention **\n"); |
dac86829 |
757 | wbias_rwlock_profile_latency_reset(); |
4fd25765 |
758 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
759 | (void *)0, |
0e0fdeb6 |
760 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
761 | BUG_ON(!trylock_writer_threads[0]); |
762 | ssleep(SINGLE_WRITER_TEST_DURATION); |
763 | kthread_stop(trylock_writer_threads[0]); |
193771da |
764 | printk("\n"); |
4fd25765 |
765 | |
dac86829 |
766 | wbias_rwlock_profile_latency_print(); |
767 | |
1f5845d5 |
768 | printk("** Single preemptable reader test, no contention **\n"); |
769 | wbias_rwlock_profile_latency_reset(); |
770 | preader_threads[0] = kthread_run(preader_thread, (void *)0, |
771 | "wbiasrwlock_preader"); |
772 | BUG_ON(!preader_threads[0]); |
773 | ssleep(SINGLE_READER_TEST_DURATION); |
774 | kthread_stop(preader_threads[0]); |
775 | printk("\n"); |
776 | |
777 | wbias_rwlock_profile_latency_print(); |
778 | |
292f0110 |
779 | #if (TEST_PREEMPT) |
1f5845d5 |
780 | printk("** Single non-preemptable reader test, no contention **\n"); |
dac86829 |
781 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
782 | npreader_threads[0] = kthread_run(npreader_thread, (void *)0, |
783 | "wbiasrwlock_npreader"); |
784 | BUG_ON(!npreader_threads[0]); |
68f25f81 |
785 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
786 | kthread_stop(npreader_threads[0]); |
193771da |
787 | printk("\n"); |
68f25f81 |
788 | |
dac86829 |
789 | wbias_rwlock_profile_latency_print(); |
292f0110 |
790 | #endif |
dac86829 |
791 | |
1f5845d5 |
792 | printk("** Multiple p/non-p readers test, no contention **\n"); |
dac86829 |
793 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
794 | for (i = 0; i < NR_PREADERS; i++) { |
795 | printk("starting preader thread %lu\n", i); |
796 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
797 | "wbiasrwlock_preader"); |
798 | BUG_ON(!preader_threads[i]); |
799 | } |
800 | for (i = 0; i < NR_NPREADERS; i++) { |
801 | printk("starting npreader thread %lu\n", i); |
802 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
803 | "wbiasrwlock_npreader"); |
804 | BUG_ON(!npreader_threads[i]); |
68f25f81 |
805 | } |
806 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
807 | for (i = 0; i < NR_NPREADERS; i++) |
808 | kthread_stop(npreader_threads[i]); |
809 | for (i = 0; i < NR_PREADERS; i++) |
810 | kthread_stop(preader_threads[i]); |
193771da |
811 | printk("\n"); |
68f25f81 |
812 | |
dac86829 |
813 | wbias_rwlock_profile_latency_print(); |
814 | |
68f25f81 |
815 | printk("** High contention test **\n"); |
dac86829 |
816 | wbias_rwlock_profile_latency_reset(); |
0e0fdeb6 |
817 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
818 | ssleep(TEST_DURATION); |
0e0fdeb6 |
819 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
193771da |
820 | printk("\n"); |
dac86829 |
821 | wbias_rwlock_profile_latency_print(); |
f0a36bb1 |
822 | |
823 | return -EPERM; |
824 | } |
825 | |
826 | |
827 | static struct file_operations my_operations = { |
828 | .open = my_open, |
829 | }; |
830 | |
831 | int init_module(void) |
832 | { |
0e0fdeb6 |
833 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
834 | if (pentry) |
835 | pentry->proc_fops = &my_operations; |
836 | |
d1f36a28 |
837 | printk("PTHREAD_ROFFSET : %016lX\n", PTHREAD_ROFFSET); |
838 | printk("PTHREAD_RMASK : %016lX\n", PTHREAD_RMASK); |
839 | printk("NPTHREAD_ROFFSET : %016lX\n", NPTHREAD_ROFFSET); |
840 | printk("NPTHREAD_RMASK : %016lX\n", NPTHREAD_RMASK); |
841 | printk("SOFTIRQ_ROFFSET : %016lX\n", SOFTIRQ_ROFFSET); |
842 | printk("SOFTIRQ_RMASK : %016lX\n", SOFTIRQ_RMASK); |
843 | printk("HARDIRQ_ROFFSET : %016lX\n", HARDIRQ_ROFFSET); |
844 | printk("HARDIRQ_RMASK : %016lX\n", HARDIRQ_RMASK); |
845 | printk("PTHREAD_WOFFSET : %016lX\n", PTHREAD_WOFFSET); |
846 | printk("PTHREAD_WMASK : %016lX\n", PTHREAD_WMASK); |
847 | printk("NPTHREAD_WOFFSET : %016lX\n", NPTHREAD_WOFFSET); |
848 | printk("NPTHREAD_WMASK : %016lX\n", NPTHREAD_WMASK); |
849 | printk("WRITER_MUTEX : %016lX\n", WRITER_MUTEX); |
850 | printk("SOFTIRQ_WMASK : %016lX\n", SOFTIRQ_WMASK); |
851 | printk("HARDIRQ_WMASK : %016lX\n", HARDIRQ_WMASK); |
9f10b219 |
852 | printk("WQ_MUTEX : %016lX\n", WQ_MUTEX); |
853 | printk("WQ_ACTIVE : %016lX\n", WQ_ACTIVE); |
f0a36bb1 |
854 | |
855 | return 0; |
856 | } |
857 | |
858 | void cleanup_module(void) |
859 | { |
0e0fdeb6 |
860 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
861 | } |
862 | |
863 | MODULE_LICENSE("GPL"); |
864 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
865 | MODULE_DESCRIPTION("wbias rwlock test"); |