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 |
1f5845d5 |
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 | |
7e9c6d5a |
117 | #if (TEST_INTERRUPTS) |
118 | #define WBIASRWLOCKMASK (BW_WPTHREAD | BW_RIRQ | BW_RNPTHREAD | BW_RPTHREAD) |
119 | #else |
120 | #if (TEST_PREEMPT) |
121 | #define WBIASRWLOCKMASK (BW_WPTHREAD | BW_RNPTHREAD | BW_RPTHREAD) |
122 | #else |
123 | #define WBIASRWLOCKMASK (BW_WPTHREAD | BW_RNPTHREAD) |
124 | #endif |
125 | #endif |
126 | static DEFINE_WBIAS_RWLOCK(wbiasrwlock, WBIASRWLOCKMASK); |
127 | CHECK_WBIAS_RWLOCK_MAP(WBIASRWLOCKMASK); |
128 | |
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129 | |
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130 | #define wrap_read_lock() wbias_read_lock(&wbiasrwlock) |
131 | #define wrap_read_trylock() wbias_read_trylock(&wbiasrwlock) |
132 | #define wrap_read_unlock() wbias_read_unlock(&wbiasrwlock) |
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133 | |
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134 | #define wrap_read_lock_inatomic() wbias_read_lock_inatomic(&wbiasrwlock) |
135 | #define wrap_read_trylock_inatomic() \ |
136 | wbias_read_trylock_inatomic(&wbiasrwlock) |
137 | #define wrap_read_unlock_inatomic() \ |
138 | wbias_read_unlock_inatomic(&wbiasrwlock) |
139 | |
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140 | #define wrap_read_lock_irq() wbias_read_lock_irq(&wbiasrwlock) |
141 | #define wrap_read_trylock_irq() wbias_read_trylock_irq(&wbiasrwlock) |
142 | #define wrap_read_unlock_irq() wbias_read_unlock_irq(&wbiasrwlock) |
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143 | |
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144 | #define wrap_write_lock() \ |
145 | wbias_write_lock(&wbiasrwlock, WBIASRWLOCKMASK) |
146 | #define wrap_write_unlock() \ |
147 | wbias_write_unlock(&wbiasrwlock, WBIASRWLOCKMASK) |
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148 | #define wrap_write_trylock_else_subscribe() \ |
7e9c6d5a |
149 | wbias_write_trylock_else_subscribe(&wbiasrwlock, WBIASRWLOCKMASK) |
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150 | #define wrap_write_trylock_subscribed() \ |
7e9c6d5a |
151 | wbias_write_trylock_subscribed(&wbiasrwlock, WBIASRWLOCKMASK) |
5b23bc48 |
152 | #define wrap_write_unsubscribe() \ |
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153 | wbias_write_unsubscribe(&wbiasrwlock, WBIASRWLOCKMASK) |
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154 | |
155 | #endif |
156 | |
68f25f81 |
157 | static cycles_t cycles_calibration_min, |
158 | cycles_calibration_avg, |
159 | cycles_calibration_max; |
160 | |
161 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
162 | { |
163 | return cycles - cycles_calibration_avg; |
164 | } |
165 | |
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166 | struct proc_dir_entry *pentry = NULL; |
167 | |
b37c9208 |
168 | static int p_or_np_reader_thread(const char *typename, |
169 | void *data, int preemptable) |
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170 | { |
171 | int i; |
172 | int prev, cur; |
173 | unsigned long iter = 0; |
5b23bc48 |
174 | cycles_t time1, time2, delay; |
175 | cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0; |
176 | cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0; |
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177 | |
b37c9208 |
178 | printk("%s/%lu runnning\n", typename, (unsigned long)data); |
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179 | do { |
180 | iter++; |
1f5845d5 |
181 | if (!preemptable) |
182 | preempt_disable(); |
68f25f81 |
183 | rdtsc_barrier(); |
7f563886 |
184 | time1 = get_cycles(); |
68f25f81 |
185 | rdtsc_barrier(); |
186 | |
1f5845d5 |
187 | if (!preemptable) |
188 | wrap_read_lock_inatomic(); |
189 | else |
190 | wrap_read_lock(); |
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191 | |
192 | rdtsc_barrier(); |
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193 | time2 = get_cycles(); |
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194 | rdtsc_barrier(); |
195 | delay = time2 - time1; |
5b23bc48 |
196 | ldelaymax = max(ldelaymax, delay); |
197 | ldelaymin = min(ldelaymin, delay); |
198 | ldelayavg += delay; |
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199 | prev = var[0]; |
200 | for (i = 1; i < NR_VARS; i++) { |
201 | cur = var[i]; |
202 | if (cur != prev) |
203 | printk(KERN_ALERT |
204 | "Unequal cur %d/prev %d at i %d, iter %lu " |
205 | "in thread\n", cur, prev, i, iter); |
206 | } |
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207 | |
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208 | rdtsc_barrier(); |
209 | time1 = get_cycles(); |
210 | rdtsc_barrier(); |
211 | |
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212 | if (!preemptable) |
213 | wrap_read_unlock_inatomic(); |
214 | else |
215 | wrap_read_unlock(); |
5b23bc48 |
216 | rdtsc_barrier(); |
217 | time2 = get_cycles(); |
218 | rdtsc_barrier(); |
219 | delay = time2 - time1; |
220 | udelaymax = max(udelaymax, delay); |
221 | udelaymin = min(udelaymin, delay); |
222 | udelayavg += delay; |
223 | |
1f5845d5 |
224 | if (!preemptable) |
225 | preempt_enable(); |
5b23bc48 |
226 | |
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227 | if (THREAD_READER_DELAY) |
228 | msleep(THREAD_READER_DELAY); |
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229 | } while (!kthread_should_stop()); |
4fd25765 |
230 | if (!iter) { |
b37c9208 |
231 | printk("%s/%lu iterations : %lu", typename, |
4fd25765 |
232 | (unsigned long)data, iter); |
233 | } else { |
5b23bc48 |
234 | ldelayavg /= iter; |
235 | udelayavg /= iter; |
b37c9208 |
236 | printk("%s/%lu iterations : %lu, " |
4fd25765 |
237 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
b37c9208 |
238 | typename, |
4fd25765 |
239 | (unsigned long)data, iter, |
5b23bc48 |
240 | calibrate_cycles(ldelaymin), |
241 | calibrate_cycles(ldelayavg), |
242 | calibrate_cycles(ldelaymax)); |
243 | printk("%s/%lu iterations : %lu, " |
244 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
245 | typename, |
246 | (unsigned long)data, iter, |
247 | calibrate_cycles(udelaymin), |
248 | calibrate_cycles(udelayavg), |
249 | calibrate_cycles(udelaymax)); |
4fd25765 |
250 | } |
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251 | return 0; |
252 | } |
253 | |
1f5845d5 |
254 | static int preader_thread(void *data) |
255 | { |
b37c9208 |
256 | return p_or_np_reader_thread("preader_thread", data, 1); |
1f5845d5 |
257 | } |
258 | |
259 | static int npreader_thread(void *data) |
260 | { |
b37c9208 |
261 | return p_or_np_reader_thread("npreader_thread", data, 0); |
1f5845d5 |
262 | } |
263 | |
1c21e42c |
264 | static int trylock_reader_thread(void *data) |
265 | { |
266 | int i; |
267 | int prev, cur; |
268 | unsigned long iter = 0, success_iter = 0; |
269 | |
270 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
271 | do { |
cd7cf33d |
272 | while (!wrap_read_trylock()) |
1c21e42c |
273 | iter++; |
274 | success_iter++; |
275 | prev = var[0]; |
276 | for (i = 1; i < NR_VARS; i++) { |
277 | cur = var[i]; |
278 | if (cur != prev) |
279 | printk(KERN_ALERT |
280 | "Unequal cur %d/prev %d at i %d, iter %lu " |
281 | "in thread\n", cur, prev, i, iter); |
282 | } |
cd7cf33d |
283 | wrap_read_unlock(); |
4fd25765 |
284 | if (THREAD_READER_DELAY) |
285 | msleep(THREAD_READER_DELAY); |
1c21e42c |
286 | } while (!kthread_should_stop()); |
287 | printk("trylock_reader_thread/%lu iterations : %lu, " |
288 | "successful iterations : %lu\n", |
289 | (unsigned long)data, iter, success_iter); |
290 | return 0; |
291 | } |
292 | |
5b23bc48 |
293 | DEFINE_PER_CPU(cycles_t, int_ldelaymin); |
294 | DEFINE_PER_CPU(cycles_t, int_ldelayavg); |
295 | DEFINE_PER_CPU(cycles_t, int_ldelaymax); |
296 | DEFINE_PER_CPU(cycles_t, int_udelaymin); |
297 | DEFINE_PER_CPU(cycles_t, int_udelayavg); |
298 | DEFINE_PER_CPU(cycles_t, int_udelaymax); |
68f25f81 |
299 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
300 | |
f0a36bb1 |
301 | static void interrupt_reader_ipi(void *data) |
302 | { |
303 | int i; |
304 | int prev, cur; |
7f563886 |
305 | cycles_t time1, time2; |
5b23bc48 |
306 | cycles_t *ldelaymax, *ldelaymin, *ldelayavg, *ipi_nr, delay; |
307 | cycles_t *udelaymax, *udelaymin, *udelayavg; |
7f563886 |
308 | |
309 | /* |
310 | * Skip the ipi caller, not in irq context. |
311 | */ |
312 | if (!in_irq()) |
313 | return; |
f0a36bb1 |
314 | |
5b23bc48 |
315 | ldelaymax = &per_cpu(int_ldelaymax, smp_processor_id()); |
316 | ldelaymin = &per_cpu(int_ldelaymin, smp_processor_id()); |
317 | ldelayavg = &per_cpu(int_ldelayavg, smp_processor_id()); |
318 | udelaymax = &per_cpu(int_udelaymax, smp_processor_id()); |
319 | udelaymin = &per_cpu(int_udelaymin, smp_processor_id()); |
320 | udelayavg = &per_cpu(int_udelayavg, smp_processor_id()); |
68f25f81 |
321 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
322 | |
323 | rdtsc_barrier(); |
7f563886 |
324 | time1 = get_cycles(); |
68f25f81 |
325 | rdtsc_barrier(); |
326 | |
cd7cf33d |
327 | wrap_read_lock_irq(); |
68f25f81 |
328 | |
329 | rdtsc_barrier(); |
7f563886 |
330 | time2 = get_cycles(); |
68f25f81 |
331 | rdtsc_barrier(); |
332 | delay = time2 - time1; |
5b23bc48 |
333 | *ldelaymax = max(*ldelaymax, delay); |
334 | *ldelaymin = min(*ldelaymin, delay); |
335 | *ldelayavg += delay; |
68f25f81 |
336 | (*ipi_nr)++; |
f0a36bb1 |
337 | prev = var[0]; |
338 | for (i = 1; i < NR_VARS; i++) { |
339 | cur = var[i]; |
340 | if (cur != prev) |
341 | printk(KERN_ALERT |
342 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
343 | cur, prev, i); |
344 | } |
5b23bc48 |
345 | rdtsc_barrier(); |
346 | time1 = get_cycles(); |
347 | rdtsc_barrier(); |
cd7cf33d |
348 | wrap_read_unlock_irq(); |
5b23bc48 |
349 | time2 = get_cycles(); |
350 | rdtsc_barrier(); |
351 | delay = time2 - time1; |
352 | *udelaymax = max(*udelaymax, delay); |
353 | *udelaymin = min(*udelaymin, delay); |
354 | *udelayavg += delay; |
f0a36bb1 |
355 | } |
356 | |
1c21e42c |
357 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
358 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
359 | |
360 | static void trylock_interrupt_reader_ipi(void *data) |
361 | { |
362 | int i; |
363 | int prev, cur; |
364 | |
365 | /* |
366 | * Skip the ipi caller, not in irq context. |
367 | */ |
368 | if (!in_irq()) |
369 | return; |
370 | |
371 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
372 | while (!wrap_read_trylock_irq()) |
1c21e42c |
373 | per_cpu(trylock_int_iter, smp_processor_id())++; |
374 | per_cpu(trylock_int_success, smp_processor_id())++; |
375 | prev = var[0]; |
376 | for (i = 1; i < NR_VARS; i++) { |
377 | cur = var[i]; |
378 | if (cur != prev) |
379 | printk(KERN_ALERT |
380 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
381 | cur, prev, i); |
382 | } |
cd7cf33d |
383 | wrap_read_unlock_irq(); |
1c21e42c |
384 | } |
385 | |
386 | |
f0a36bb1 |
387 | static int interrupt_reader_thread(void *data) |
388 | { |
389 | unsigned long iter = 0; |
7f563886 |
390 | int i; |
391 | |
68f25f81 |
392 | for_each_online_cpu(i) { |
5b23bc48 |
393 | per_cpu(int_ldelaymax, i) = 0; |
394 | per_cpu(int_ldelaymin, i) = ULLONG_MAX; |
395 | per_cpu(int_ldelayavg, i) = 0; |
396 | per_cpu(int_udelaymax, i) = 0; |
397 | per_cpu(int_udelaymin, i) = ULLONG_MAX; |
398 | per_cpu(int_udelayavg, i) = 0; |
68f25f81 |
399 | per_cpu(int_ipi_nr, i) = 0; |
400 | } |
f0a36bb1 |
401 | do { |
402 | iter++; |
403 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
404 | if (INTERRUPT_READER_DELAY) |
405 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
406 | } while (!kthread_should_stop()); |
407 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
408 | (unsigned long)data, iter); |
7f563886 |
409 | for_each_online_cpu(i) { |
4fd25765 |
410 | if (!per_cpu(int_ipi_nr, i)) |
411 | continue; |
8314e111 |
412 | per_cpu(int_ldelayavg, i) /= per_cpu(int_ipi_nr, i); |
413 | per_cpu(int_udelayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
414 | printk("interrupt readers on CPU %i, " |
68f25f81 |
415 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
416 | i, |
5b23bc48 |
417 | calibrate_cycles(per_cpu(int_ldelaymin, i)), |
418 | calibrate_cycles(per_cpu(int_ldelayavg, i)), |
419 | calibrate_cycles(per_cpu(int_ldelaymax, i))); |
420 | printk("interrupt readers on CPU %i, " |
421 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
422 | i, |
423 | calibrate_cycles(per_cpu(int_udelaymin, i)), |
424 | calibrate_cycles(per_cpu(int_udelayavg, i)), |
425 | calibrate_cycles(per_cpu(int_udelaymax, i))); |
7f563886 |
426 | } |
f0a36bb1 |
427 | return 0; |
428 | } |
429 | |
1c21e42c |
430 | static int trylock_interrupt_reader_thread(void *data) |
431 | { |
432 | unsigned long iter = 0; |
433 | int i; |
434 | |
435 | do { |
436 | iter++; |
437 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
438 | if (INTERRUPT_READER_DELAY) |
439 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
440 | } while (!kthread_should_stop()); |
441 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
442 | (unsigned long)data, iter); |
443 | for_each_online_cpu(i) { |
444 | printk("trylock interrupt readers on CPU %i, " |
445 | "iterations %lu, " |
446 | "successful iterations : %lu\n", |
447 | i, per_cpu(trylock_int_iter, i), |
448 | per_cpu(trylock_int_success, i)); |
68f25f81 |
449 | per_cpu(trylock_int_iter, i) = 0; |
450 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
451 | } |
452 | return 0; |
453 | } |
454 | |
f0a36bb1 |
455 | static int writer_thread(void *data) |
456 | { |
457 | int i; |
458 | int new; |
459 | unsigned long iter = 0; |
5b23bc48 |
460 | cycles_t time1, time2, delay; |
461 | cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0; |
462 | cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0; |
f0a36bb1 |
463 | |
464 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
465 | do { |
466 | iter++; |
ae4a4ebf |
467 | //preempt_disable(); /* for get_cycles accuracy */ |
68f25f81 |
468 | rdtsc_barrier(); |
7f563886 |
469 | time1 = get_cycles(); |
68f25f81 |
470 | rdtsc_barrier(); |
471 | |
cd7cf33d |
472 | wrap_write_lock(); |
68f25f81 |
473 | |
474 | rdtsc_barrier(); |
7f563886 |
475 | time2 = get_cycles(); |
68f25f81 |
476 | rdtsc_barrier(); |
477 | delay = time2 - time1; |
5b23bc48 |
478 | ldelaymax = max(ldelaymax, delay); |
479 | ldelaymin = min(ldelaymin, delay); |
480 | ldelayavg += delay; |
f0a36bb1 |
481 | new = (int)get_cycles(); |
482 | for (i = 0; i < NR_VARS; i++) { |
483 | var[i] = new; |
484 | } |
cd7cf33d |
485 | |
5b23bc48 |
486 | rdtsc_barrier(); |
487 | time1 = get_cycles(); |
488 | rdtsc_barrier(); |
489 | |
cd7cf33d |
490 | wrap_write_unlock(); |
491 | |
5b23bc48 |
492 | rdtsc_barrier(); |
493 | time2 = get_cycles(); |
494 | rdtsc_barrier(); |
495 | delay = time2 - time1; |
496 | udelaymax = max(udelaymax, delay); |
497 | udelaymin = min(udelaymin, delay); |
498 | udelayavg += delay; |
499 | |
ae4a4ebf |
500 | //preempt_enable(); /* for get_cycles accuracy */ |
89889f86 |
501 | if (WRITER_DELAY > 0) |
4d1751f9 |
502 | udelay(WRITER_DELAY); |
f0a36bb1 |
503 | } while (!kthread_should_stop()); |
5b23bc48 |
504 | ldelayavg /= iter; |
505 | udelayavg /= iter; |
7f563886 |
506 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
507 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
508 | (unsigned long)data, iter, |
8314e111 |
509 | calibrate_cycles(ldelaymin), |
510 | calibrate_cycles(ldelayavg), |
511 | calibrate_cycles(ldelaymax)); |
5b23bc48 |
512 | printk("writer_thread/%lu iterations : %lu, " |
513 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
514 | (unsigned long)data, iter, |
515 | calibrate_cycles(udelaymin), |
516 | calibrate_cycles(udelayavg), |
517 | calibrate_cycles(udelaymax)); |
f0a36bb1 |
518 | return 0; |
519 | } |
520 | |
cd7cf33d |
521 | #if (TEST_STD_RWLOCK) |
522 | static int trylock_writer_thread(void *data) |
523 | { |
524 | int i; |
525 | int new; |
526 | unsigned long iter = 0, success = 0, fail = 0; |
527 | |
528 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
529 | do { |
530 | #if (TEST_INTERRUPTS) |
531 | /* std write trylock cannot disable interrupts. */ |
532 | local_irq_disable(); |
533 | #endif |
534 | |
535 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
536 | for (;;) { |
537 | iter++; |
538 | if (write_trylock(&std_rw_lock)) |
539 | goto locked; |
540 | } |
541 | #else |
542 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
543 | iter++; |
544 | if (write_trylock(&std_rw_lock)) |
545 | goto locked; |
546 | } |
547 | #endif |
548 | fail++; |
549 | #if (TEST_INTERRUPTS) |
550 | local_irq_enable(); |
551 | #endif |
552 | goto loop; |
553 | locked: |
554 | success++; |
555 | new = (int)get_cycles(); |
556 | for (i = 0; i < NR_VARS; i++) { |
557 | var[i] = new; |
558 | } |
559 | #if (TEST_INTERRUPTS) |
560 | write_unlock_irq(&std_rw_lock); |
561 | #else |
562 | write_unlock(&std_rw_lock); |
563 | #endif |
564 | loop: |
565 | if (TRYLOCK_WRITER_DELAY > 0) |
566 | udelay(TRYLOCK_WRITER_DELAY); |
567 | } while (!kthread_should_stop()); |
568 | printk("trylock_writer_thread/%lu iterations : " |
569 | "[try,success,fail after %d try], " |
570 | "%lu,%lu,%lu\n", |
571 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
572 | iter, success, fail); |
573 | return 0; |
574 | } |
575 | |
576 | #else /* !TEST_STD_RWLOCK */ |
577 | |
1c21e42c |
578 | static int trylock_writer_thread(void *data) |
579 | { |
580 | int i; |
581 | int new; |
4fd25765 |
582 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
583 | |
584 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
585 | do { |
4fd25765 |
586 | iter++; |
992fbe0f |
587 | if (wrap_write_trylock_else_subscribe()) |
4fd25765 |
588 | goto locked; |
cd7cf33d |
589 | |
4fd25765 |
590 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
591 | for (;;) { |
1c21e42c |
592 | iter++; |
992fbe0f |
593 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
594 | goto locked; |
1c21e42c |
595 | } |
4fd25765 |
596 | #else |
cd7cf33d |
597 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
598 | iter++; |
992fbe0f |
599 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
600 | goto locked; |
601 | } |
602 | #endif |
603 | fail++; |
5b23bc48 |
604 | wrap_write_unsubscribe(); |
4fd25765 |
605 | goto loop; |
606 | locked: |
1c21e42c |
607 | success++; |
1c21e42c |
608 | new = (int)get_cycles(); |
609 | for (i = 0; i < NR_VARS; i++) { |
610 | var[i] = new; |
611 | } |
992fbe0f |
612 | wrap_write_unlock(); |
4fd25765 |
613 | loop: |
614 | if (TRYLOCK_WRITER_DELAY > 0) |
615 | udelay(TRYLOCK_WRITER_DELAY); |
1c21e42c |
616 | } while (!kthread_should_stop()); |
4fd25765 |
617 | printk("trylock_writer_thread/%lu iterations : " |
618 | "[try,success,fail after %d try], " |
619 | "%lu,%lu,%lu\n", |
620 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
621 | iter, success, fail); |
1c21e42c |
622 | return 0; |
623 | } |
624 | |
cd7cf33d |
625 | #endif /* TEST_STD_RWLOCK */ |
626 | |
0e0fdeb6 |
627 | static void wbias_rwlock_create(void) |
f0a36bb1 |
628 | { |
629 | unsigned long i; |
630 | |
1f5845d5 |
631 | for (i = 0; i < NR_PREADERS; i++) { |
632 | printk("starting preemptable reader thread %lu\n", i); |
633 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
634 | "wbiasrwlock_preader"); |
635 | BUG_ON(!preader_threads[i]); |
636 | } |
637 | |
638 | for (i = 0; i < NR_NPREADERS; i++) { |
639 | printk("starting non-preemptable reader thread %lu\n", i); |
640 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
641 | "wbiasrwlock_npreader"); |
642 | BUG_ON(!npreader_threads[i]); |
f0a36bb1 |
643 | } |
644 | |
1c21e42c |
645 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
646 | printk("starting trylock reader thread %lu\n", i); |
647 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
0e0fdeb6 |
648 | (void *)i, "wbiasrwlock_trylock_reader"); |
1c21e42c |
649 | BUG_ON(!trylock_reader_threads[i]); |
650 | } |
4fd25765 |
651 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
652 | printk("starting interrupt reader %lu\n", i); |
653 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
654 | (void *)i, |
0e0fdeb6 |
655 | "wbiasrwlock_interrupt_reader"); |
4fd25765 |
656 | } |
657 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
658 | printk("starting trylock interrupt reader %lu\n", i); |
659 | trylock_interrupt_reader[i] = |
660 | kthread_run(trylock_interrupt_reader_thread, |
0e0fdeb6 |
661 | (void *)i, "wbiasrwlock_trylock_interrupt_reader"); |
4fd25765 |
662 | } |
f0a36bb1 |
663 | for (i = 0; i < NR_WRITERS; i++) { |
664 | printk("starting writer thread %lu\n", i); |
665 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
0e0fdeb6 |
666 | "wbiasrwlock_writer"); |
f0a36bb1 |
667 | BUG_ON(!writer_threads[i]); |
668 | } |
1c21e42c |
669 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
670 | printk("starting trylock writer thread %lu\n", i); |
671 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
0e0fdeb6 |
672 | (void *)i, "wbiasrwlock_trylock_writer"); |
1c21e42c |
673 | BUG_ON(!trylock_writer_threads[i]); |
674 | } |
f0a36bb1 |
675 | } |
676 | |
0e0fdeb6 |
677 | static void wbias_rwlock_stop(void) |
f0a36bb1 |
678 | { |
679 | unsigned long i; |
680 | |
1c21e42c |
681 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
682 | kthread_stop(writer_threads[i]); |
1c21e42c |
683 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
684 | kthread_stop(trylock_writer_threads[i]); |
1f5845d5 |
685 | for (i = 0; i < NR_NPREADERS; i++) |
686 | kthread_stop(npreader_threads[i]); |
687 | for (i = 0; i < NR_PREADERS; i++) |
688 | kthread_stop(preader_threads[i]); |
1c21e42c |
689 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
690 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
691 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
692 | kthread_stop(interrupt_reader[i]); |
693 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
694 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
695 | } |
696 | |
697 | |
698 | static void perform_test(const char *name, void (*callback)(void)) |
699 | { |
700 | printk("%s\n", name); |
701 | callback(); |
702 | } |
703 | |
704 | static int my_open(struct inode *inode, struct file *file) |
705 | { |
68f25f81 |
706 | unsigned long i; |
707 | cycles_t time1, time2, delay; |
708 | |
709 | printk("** get_cycles calibration **\n"); |
710 | cycles_calibration_min = ULLONG_MAX; |
711 | cycles_calibration_avg = 0; |
712 | cycles_calibration_max = 0; |
713 | |
714 | local_irq_disable(); |
715 | for (i = 0; i < 10; i++) { |
716 | rdtsc_barrier(); |
717 | time1 = get_cycles(); |
718 | rdtsc_barrier(); |
719 | rdtsc_barrier(); |
720 | time2 = get_cycles(); |
721 | rdtsc_barrier(); |
722 | delay = time2 - time1; |
723 | cycles_calibration_min = min(cycles_calibration_min, delay); |
724 | cycles_calibration_avg += delay; |
725 | cycles_calibration_max = max(cycles_calibration_max, delay); |
726 | } |
727 | cycles_calibration_avg /= 10; |
728 | local_irq_enable(); |
729 | |
730 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
731 | "results calibrated on avg\n", |
732 | cycles_calibration_min, |
733 | cycles_calibration_avg, |
734 | cycles_calibration_max); |
193771da |
735 | printk("\n"); |
68f25f81 |
736 | |
737 | printk("** Single writer test, no contention **\n"); |
dac86829 |
738 | wbias_rwlock_profile_latency_reset(); |
68f25f81 |
739 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
740 | "wbiasrwlock_writer"); |
68f25f81 |
741 | BUG_ON(!writer_threads[0]); |
742 | ssleep(SINGLE_WRITER_TEST_DURATION); |
743 | kthread_stop(writer_threads[0]); |
193771da |
744 | printk("\n"); |
68f25f81 |
745 | |
dac86829 |
746 | wbias_rwlock_profile_latency_print(); |
747 | |
4fd25765 |
748 | printk("** Single trylock writer test, no contention **\n"); |
dac86829 |
749 | wbias_rwlock_profile_latency_reset(); |
4fd25765 |
750 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
751 | (void *)0, |
0e0fdeb6 |
752 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
753 | BUG_ON(!trylock_writer_threads[0]); |
754 | ssleep(SINGLE_WRITER_TEST_DURATION); |
755 | kthread_stop(trylock_writer_threads[0]); |
193771da |
756 | printk("\n"); |
4fd25765 |
757 | |
dac86829 |
758 | wbias_rwlock_profile_latency_print(); |
759 | |
1f5845d5 |
760 | printk("** Single preemptable reader test, no contention **\n"); |
761 | wbias_rwlock_profile_latency_reset(); |
762 | preader_threads[0] = kthread_run(preader_thread, (void *)0, |
763 | "wbiasrwlock_preader"); |
764 | BUG_ON(!preader_threads[0]); |
765 | ssleep(SINGLE_READER_TEST_DURATION); |
766 | kthread_stop(preader_threads[0]); |
767 | printk("\n"); |
768 | |
769 | wbias_rwlock_profile_latency_print(); |
770 | |
292f0110 |
771 | #if (TEST_PREEMPT) |
1f5845d5 |
772 | printk("** Single non-preemptable reader test, no contention **\n"); |
dac86829 |
773 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
774 | npreader_threads[0] = kthread_run(npreader_thread, (void *)0, |
775 | "wbiasrwlock_npreader"); |
776 | BUG_ON(!npreader_threads[0]); |
68f25f81 |
777 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
778 | kthread_stop(npreader_threads[0]); |
193771da |
779 | printk("\n"); |
68f25f81 |
780 | |
dac86829 |
781 | wbias_rwlock_profile_latency_print(); |
292f0110 |
782 | #endif |
dac86829 |
783 | |
1f5845d5 |
784 | printk("** Multiple p/non-p readers test, no contention **\n"); |
dac86829 |
785 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
786 | for (i = 0; i < NR_PREADERS; i++) { |
787 | printk("starting preader thread %lu\n", i); |
788 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
789 | "wbiasrwlock_preader"); |
790 | BUG_ON(!preader_threads[i]); |
791 | } |
792 | for (i = 0; i < NR_NPREADERS; i++) { |
793 | printk("starting npreader thread %lu\n", i); |
794 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
795 | "wbiasrwlock_npreader"); |
796 | BUG_ON(!npreader_threads[i]); |
68f25f81 |
797 | } |
798 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
799 | for (i = 0; i < NR_NPREADERS; i++) |
800 | kthread_stop(npreader_threads[i]); |
801 | for (i = 0; i < NR_PREADERS; i++) |
802 | kthread_stop(preader_threads[i]); |
193771da |
803 | printk("\n"); |
68f25f81 |
804 | |
dac86829 |
805 | wbias_rwlock_profile_latency_print(); |
806 | |
68f25f81 |
807 | printk("** High contention test **\n"); |
dac86829 |
808 | wbias_rwlock_profile_latency_reset(); |
0e0fdeb6 |
809 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
810 | ssleep(TEST_DURATION); |
0e0fdeb6 |
811 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
193771da |
812 | printk("\n"); |
dac86829 |
813 | wbias_rwlock_profile_latency_print(); |
f0a36bb1 |
814 | |
815 | return -EPERM; |
816 | } |
817 | |
818 | |
819 | static struct file_operations my_operations = { |
820 | .open = my_open, |
821 | }; |
822 | |
823 | int init_module(void) |
824 | { |
0e0fdeb6 |
825 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
826 | if (pentry) |
827 | pentry->proc_fops = &my_operations; |
828 | |
d1f36a28 |
829 | printk("PTHREAD_ROFFSET : %016lX\n", PTHREAD_ROFFSET); |
830 | printk("PTHREAD_RMASK : %016lX\n", PTHREAD_RMASK); |
831 | printk("NPTHREAD_ROFFSET : %016lX\n", NPTHREAD_ROFFSET); |
832 | printk("NPTHREAD_RMASK : %016lX\n", NPTHREAD_RMASK); |
833 | printk("SOFTIRQ_ROFFSET : %016lX\n", SOFTIRQ_ROFFSET); |
834 | printk("SOFTIRQ_RMASK : %016lX\n", SOFTIRQ_RMASK); |
835 | printk("HARDIRQ_ROFFSET : %016lX\n", HARDIRQ_ROFFSET); |
836 | printk("HARDIRQ_RMASK : %016lX\n", HARDIRQ_RMASK); |
837 | printk("PTHREAD_WOFFSET : %016lX\n", PTHREAD_WOFFSET); |
838 | printk("PTHREAD_WMASK : %016lX\n", PTHREAD_WMASK); |
839 | printk("NPTHREAD_WOFFSET : %016lX\n", NPTHREAD_WOFFSET); |
840 | printk("NPTHREAD_WMASK : %016lX\n", NPTHREAD_WMASK); |
841 | printk("WRITER_MUTEX : %016lX\n", WRITER_MUTEX); |
842 | printk("SOFTIRQ_WMASK : %016lX\n", SOFTIRQ_WMASK); |
843 | printk("HARDIRQ_WMASK : %016lX\n", HARDIRQ_WMASK); |
9f10b219 |
844 | printk("WQ_MUTEX : %016lX\n", WQ_MUTEX); |
845 | printk("WQ_ACTIVE : %016lX\n", WQ_ACTIVE); |
f0a36bb1 |
846 | |
847 | return 0; |
848 | } |
849 | |
850 | void cleanup_module(void) |
851 | { |
0e0fdeb6 |
852 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
853 | } |
854 | |
855 | MODULE_LICENSE("GPL"); |
856 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
857 | MODULE_DESCRIPTION("wbias rwlock test"); |