0e0fdeb6 |
1 | /* test-wbias-rwlock.c |
f0a36bb1 |
2 | * |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/proc_fs.h> |
7 | #include <linux/sched.h> |
8 | #include <linux/timex.h> |
f0a36bb1 |
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 | |
68f25f81 |
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 |
89889f86 |
25 | |
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26 | #define NR_VARS 100 |
1c21e42c |
27 | #define NR_WRITERS 2 |
6ef60a84 |
28 | #define NR_TRYLOCK_WRITERS 2 |
29 | #define NR_NPREADERS 4 |
30 | #define NR_TRYLOCK_READERS 2 |
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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 |
4fd25765 |
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 |
992fbe0f |
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 |
4fd25765 |
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 |
89889f86 |
81 | |
6ef60a84 |
82 | #ifdef CONFIG_PREEMPT |
83 | #define yield_in_non_preempt() |
84 | #else |
85 | #define yield_in_non_preempt() yield() |
86 | #endif |
87 | |
f0a36bb1 |
88 | static int var[NR_VARS]; |
1f5845d5 |
89 | static struct task_struct *preader_threads[NR_PREADERS]; |
90 | static struct task_struct *npreader_threads[NR_NPREADERS]; |
1c21e42c |
91 | static struct task_struct *trylock_reader_threads[NR_TRYLOCK_READERS]; |
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92 | static struct task_struct *writer_threads[NR_WRITERS]; |
1c21e42c |
93 | static struct task_struct *trylock_writer_threads[NR_TRYLOCK_WRITERS]; |
4fd25765 |
94 | static struct task_struct *interrupt_reader[NR_INTERRUPT_READERS]; |
95 | static struct task_struct *trylock_interrupt_reader[NR_TRYLOCK_INTERRUPT_READERS]; |
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96 | |
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97 | #if (TEST_STD_RWLOCK) |
98 | |
99 | static DEFINE_RWLOCK(std_rw_lock); |
100 | |
101 | #define wrap_read_lock() read_lock(&std_rw_lock) |
102 | #define wrap_read_trylock() read_trylock(&std_rw_lock) |
103 | #define wrap_read_unlock() read_unlock(&std_rw_lock) |
104 | |
1f5845d5 |
105 | #define wrap_read_lock_inatomic() read_lock(&std_rw_lock) |
106 | #define wrap_read_trylock_inatomic() read_trylock(&std_rw_lock) |
1f5845d5 |
107 | |
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108 | #define wrap_read_lock_irq() read_lock(&std_rw_lock) |
109 | #define wrap_read_trylock_irq() read_trylock(&std_rw_lock) |
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110 | |
111 | #if (TEST_INTERRUPTS) |
112 | #define wrap_write_lock() write_lock_irq(&std_rw_lock) |
113 | #define wrap_write_unlock() write_unlock_irq(&std_rw_lock) |
114 | #else |
115 | #define wrap_write_lock() write_lock(&std_rw_lock) |
116 | #define wrap_write_unlock() write_unlock(&std_rw_lock) |
117 | #endif |
118 | |
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119 | #define wrap_write_trylock() write_trylock(&std_rw_lock) |
120 | |
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121 | #else |
122 | |
7e9c6d5a |
123 | #if (TEST_INTERRUPTS) |
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124 | #if (TEST_PREEMPT) |
6ef60a84 |
125 | #define WBIASRWLOCKMASK (WB_WPTHREAD | WB_RIRQ | WB_RNPTHREAD | WB_RPTHREAD) |
7e9c6d5a |
126 | #else |
6ef60a84 |
127 | #define WBIASRWLOCKMASK (WB_WNPTHREAD | WB_RIRQ | WB_RNPTHREAD) |
0cb746e2 |
128 | #endif |
129 | #else |
7e9c6d5a |
130 | #if (TEST_PREEMPT) |
6ef60a84 |
131 | #define WBIASRWLOCKMASK (WB_WPTHREAD | WB_RNPTHREAD | WB_RPTHREAD) |
7e9c6d5a |
132 | #else |
6ef60a84 |
133 | #define WBIASRWLOCKMASK (WB_WNPTHREAD | WB_RNPTHREAD) |
7e9c6d5a |
134 | #endif |
135 | #endif |
136 | static DEFINE_WBIAS_RWLOCK(wbiasrwlock, WBIASRWLOCKMASK); |
0cb746e2 |
137 | CHECK_WBIAS_RWLOCK_MAP(wbiasrwlock, WBIASRWLOCKMASK); |
7e9c6d5a |
138 | |
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139 | |
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140 | #if (TEST_PREEMPT) |
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141 | #define wrap_read_lock() wbias_read_lock(&wbiasrwlock) |
142 | #define wrap_read_trylock() wbias_read_trylock(&wbiasrwlock) |
0cb746e2 |
143 | #else |
144 | #define wrap_read_lock() wbias_read_lock_inatomic(&wbiasrwlock) |
145 | #define wrap_read_trylock() wbias_read_trylock_inatomic(&wbiasrwlock) |
0cb746e2 |
146 | #endif |
6ef60a84 |
147 | #define wrap_read_unlock() wbias_read_unlock(&wbiasrwlock) |
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148 | |
1f5845d5 |
149 | #define wrap_read_lock_inatomic() wbias_read_lock_inatomic(&wbiasrwlock) |
6ef60a84 |
150 | #define wrap_read_trylock_inatomic() \ |
1f5845d5 |
151 | wbias_read_trylock_inatomic(&wbiasrwlock) |
1f5845d5 |
152 | |
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153 | #define wrap_read_lock_irq() wbias_read_lock_irq(&wbiasrwlock) |
154 | #define wrap_read_trylock_irq() wbias_read_trylock_irq(&wbiasrwlock) |
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155 | |
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156 | #define wrap_write_lock() \ |
157 | wbias_write_lock(&wbiasrwlock, WBIASRWLOCKMASK) |
158 | #define wrap_write_unlock() \ |
159 | wbias_write_unlock(&wbiasrwlock, WBIASRWLOCKMASK) |
6ef60a84 |
160 | #define wrap_write_trylock() \ |
161 | wbias_write_trylock(&wbiasrwlock, WBIASRWLOCKMASK) |
cd7cf33d |
162 | |
163 | #endif |
164 | |
68f25f81 |
165 | static cycles_t cycles_calibration_min, |
166 | cycles_calibration_avg, |
167 | cycles_calibration_max; |
168 | |
169 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
170 | { |
171 | return cycles - cycles_calibration_avg; |
172 | } |
173 | |
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174 | struct proc_dir_entry *pentry = NULL; |
175 | |
b37c9208 |
176 | static int p_or_np_reader_thread(const char *typename, |
177 | void *data, int preemptable) |
f0a36bb1 |
178 | { |
179 | int i; |
180 | int prev, cur; |
181 | unsigned long iter = 0; |
5b23bc48 |
182 | cycles_t time1, time2, delay; |
183 | cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0; |
184 | cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0; |
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185 | |
b37c9208 |
186 | printk("%s/%lu runnning\n", typename, (unsigned long)data); |
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187 | do { |
188 | iter++; |
1f5845d5 |
189 | if (!preemptable) |
190 | preempt_disable(); |
68f25f81 |
191 | rdtsc_barrier(); |
7f563886 |
192 | time1 = get_cycles(); |
68f25f81 |
193 | rdtsc_barrier(); |
194 | |
1f5845d5 |
195 | if (!preemptable) |
196 | wrap_read_lock_inatomic(); |
197 | else |
198 | wrap_read_lock(); |
68f25f81 |
199 | |
200 | rdtsc_barrier(); |
7f563886 |
201 | time2 = get_cycles(); |
68f25f81 |
202 | rdtsc_barrier(); |
203 | delay = time2 - time1; |
5b23bc48 |
204 | ldelaymax = max(ldelaymax, delay); |
205 | ldelaymin = min(ldelaymin, delay); |
206 | ldelayavg += delay; |
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207 | prev = var[0]; |
208 | for (i = 1; i < NR_VARS; i++) { |
209 | cur = var[i]; |
6ef60a84 |
210 | if (cur != prev) { |
f0a36bb1 |
211 | printk(KERN_ALERT |
212 | "Unequal cur %d/prev %d at i %d, iter %lu " |
6ef60a84 |
213 | "in reader thread\n", |
214 | cur, prev, i, iter); |
215 | } |
f0a36bb1 |
216 | } |
cd7cf33d |
217 | |
5b23bc48 |
218 | rdtsc_barrier(); |
219 | time1 = get_cycles(); |
220 | rdtsc_barrier(); |
221 | |
6ef60a84 |
222 | wrap_read_unlock(); |
223 | |
5b23bc48 |
224 | rdtsc_barrier(); |
225 | time2 = get_cycles(); |
226 | rdtsc_barrier(); |
227 | delay = time2 - time1; |
228 | udelaymax = max(udelaymax, delay); |
229 | udelaymin = min(udelaymin, delay); |
230 | udelayavg += delay; |
231 | |
1f5845d5 |
232 | if (!preemptable) |
233 | preempt_enable(); |
5b23bc48 |
234 | |
4fd25765 |
235 | if (THREAD_READER_DELAY) |
236 | msleep(THREAD_READER_DELAY); |
6ef60a84 |
237 | yield_in_non_preempt(); |
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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, |
4fd25765 |
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 | } |
f0a36bb1 |
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 { |
0cb746e2 |
281 | #if (!TEST_PREEMPT) |
282 | preempt_disable(); |
283 | #endif |
6ef60a84 |
284 | while (!wrap_read_trylock()) { |
285 | cpu_relax(); |
1c21e42c |
286 | iter++; |
6ef60a84 |
287 | } |
1c21e42c |
288 | success_iter++; |
289 | prev = var[0]; |
290 | for (i = 1; i < NR_VARS; i++) { |
291 | cur = var[i]; |
6ef60a84 |
292 | if (cur != prev) { |
1c21e42c |
293 | printk(KERN_ALERT |
294 | "Unequal cur %d/prev %d at i %d, iter %lu " |
6ef60a84 |
295 | "in trylock reader thread\n", |
296 | cur, prev, i, iter); |
297 | } |
1c21e42c |
298 | } |
cd7cf33d |
299 | wrap_read_unlock(); |
0cb746e2 |
300 | #if (!TEST_PREEMPT) |
301 | preempt_enable(); |
302 | #endif |
4fd25765 |
303 | if (THREAD_READER_DELAY) |
304 | msleep(THREAD_READER_DELAY); |
6ef60a84 |
305 | yield_in_non_preempt(); |
1c21e42c |
306 | } while (!kthread_should_stop()); |
307 | printk("trylock_reader_thread/%lu iterations : %lu, " |
308 | "successful iterations : %lu\n", |
309 | (unsigned long)data, iter, success_iter); |
310 | return 0; |
311 | } |
312 | |
5b23bc48 |
313 | DEFINE_PER_CPU(cycles_t, int_ldelaymin); |
314 | DEFINE_PER_CPU(cycles_t, int_ldelayavg); |
315 | DEFINE_PER_CPU(cycles_t, int_ldelaymax); |
316 | DEFINE_PER_CPU(cycles_t, int_udelaymin); |
317 | DEFINE_PER_CPU(cycles_t, int_udelayavg); |
318 | DEFINE_PER_CPU(cycles_t, int_udelaymax); |
68f25f81 |
319 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
320 | |
f0a36bb1 |
321 | static void interrupt_reader_ipi(void *data) |
322 | { |
323 | int i; |
324 | int prev, cur; |
7f563886 |
325 | cycles_t time1, time2; |
5b23bc48 |
326 | cycles_t *ldelaymax, *ldelaymin, *ldelayavg, *ipi_nr, delay; |
327 | cycles_t *udelaymax, *udelaymin, *udelayavg; |
7f563886 |
328 | |
329 | /* |
330 | * Skip the ipi caller, not in irq context. |
331 | */ |
332 | if (!in_irq()) |
333 | return; |
f0a36bb1 |
334 | |
5b23bc48 |
335 | ldelaymax = &per_cpu(int_ldelaymax, smp_processor_id()); |
336 | ldelaymin = &per_cpu(int_ldelaymin, smp_processor_id()); |
337 | ldelayavg = &per_cpu(int_ldelayavg, smp_processor_id()); |
338 | udelaymax = &per_cpu(int_udelaymax, smp_processor_id()); |
339 | udelaymin = &per_cpu(int_udelaymin, smp_processor_id()); |
340 | udelayavg = &per_cpu(int_udelayavg, smp_processor_id()); |
68f25f81 |
341 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
342 | |
343 | rdtsc_barrier(); |
7f563886 |
344 | time1 = get_cycles(); |
68f25f81 |
345 | rdtsc_barrier(); |
346 | |
cd7cf33d |
347 | wrap_read_lock_irq(); |
68f25f81 |
348 | |
349 | rdtsc_barrier(); |
7f563886 |
350 | time2 = get_cycles(); |
68f25f81 |
351 | rdtsc_barrier(); |
352 | delay = time2 - time1; |
5b23bc48 |
353 | *ldelaymax = max(*ldelaymax, delay); |
354 | *ldelaymin = min(*ldelaymin, delay); |
355 | *ldelayavg += delay; |
68f25f81 |
356 | (*ipi_nr)++; |
f0a36bb1 |
357 | prev = var[0]; |
358 | for (i = 1; i < NR_VARS; i++) { |
359 | cur = var[i]; |
360 | if (cur != prev) |
361 | printk(KERN_ALERT |
362 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
363 | cur, prev, i); |
364 | } |
5b23bc48 |
365 | rdtsc_barrier(); |
366 | time1 = get_cycles(); |
367 | rdtsc_barrier(); |
6ef60a84 |
368 | wrap_read_unlock(); |
5b23bc48 |
369 | time2 = get_cycles(); |
370 | rdtsc_barrier(); |
371 | delay = time2 - time1; |
372 | *udelaymax = max(*udelaymax, delay); |
373 | *udelaymin = min(*udelaymin, delay); |
374 | *udelayavg += delay; |
f0a36bb1 |
375 | } |
376 | |
1c21e42c |
377 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
378 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
379 | |
380 | static void trylock_interrupt_reader_ipi(void *data) |
381 | { |
382 | int i; |
383 | int prev, cur; |
384 | |
385 | /* |
386 | * Skip the ipi caller, not in irq context. |
387 | */ |
388 | if (!in_irq()) |
389 | return; |
390 | |
391 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
392 | while (!wrap_read_trylock_irq()) |
1c21e42c |
393 | per_cpu(trylock_int_iter, smp_processor_id())++; |
394 | per_cpu(trylock_int_success, smp_processor_id())++; |
395 | prev = var[0]; |
396 | for (i = 1; i < NR_VARS; i++) { |
397 | cur = var[i]; |
398 | if (cur != prev) |
399 | printk(KERN_ALERT |
400 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
401 | cur, prev, i); |
402 | } |
6ef60a84 |
403 | wrap_read_unlock(); |
1c21e42c |
404 | } |
405 | |
406 | |
f0a36bb1 |
407 | static int interrupt_reader_thread(void *data) |
408 | { |
409 | unsigned long iter = 0; |
7f563886 |
410 | int i; |
411 | |
68f25f81 |
412 | for_each_online_cpu(i) { |
5b23bc48 |
413 | per_cpu(int_ldelaymax, i) = 0; |
414 | per_cpu(int_ldelaymin, i) = ULLONG_MAX; |
415 | per_cpu(int_ldelayavg, i) = 0; |
416 | per_cpu(int_udelaymax, i) = 0; |
417 | per_cpu(int_udelaymin, i) = ULLONG_MAX; |
418 | per_cpu(int_udelayavg, i) = 0; |
68f25f81 |
419 | per_cpu(int_ipi_nr, i) = 0; |
420 | } |
f0a36bb1 |
421 | do { |
422 | iter++; |
423 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
424 | if (INTERRUPT_READER_DELAY) |
425 | msleep(INTERRUPT_READER_DELAY); |
6ef60a84 |
426 | yield_in_non_preempt(); |
f0a36bb1 |
427 | } while (!kthread_should_stop()); |
428 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
429 | (unsigned long)data, iter); |
7f563886 |
430 | for_each_online_cpu(i) { |
4fd25765 |
431 | if (!per_cpu(int_ipi_nr, i)) |
432 | continue; |
8314e111 |
433 | per_cpu(int_ldelayavg, i) /= per_cpu(int_ipi_nr, i); |
434 | per_cpu(int_udelayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
435 | printk("interrupt readers on CPU %i, " |
68f25f81 |
436 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
437 | i, |
5b23bc48 |
438 | calibrate_cycles(per_cpu(int_ldelaymin, i)), |
439 | calibrate_cycles(per_cpu(int_ldelayavg, i)), |
440 | calibrate_cycles(per_cpu(int_ldelaymax, i))); |
441 | printk("interrupt readers on CPU %i, " |
442 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
443 | i, |
444 | calibrate_cycles(per_cpu(int_udelaymin, i)), |
445 | calibrate_cycles(per_cpu(int_udelayavg, i)), |
446 | calibrate_cycles(per_cpu(int_udelaymax, i))); |
7f563886 |
447 | } |
f0a36bb1 |
448 | return 0; |
449 | } |
450 | |
1c21e42c |
451 | static int trylock_interrupt_reader_thread(void *data) |
452 | { |
453 | unsigned long iter = 0; |
454 | int i; |
455 | |
456 | do { |
457 | iter++; |
458 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
459 | if (INTERRUPT_READER_DELAY) |
460 | msleep(INTERRUPT_READER_DELAY); |
6ef60a84 |
461 | yield_in_non_preempt(); |
1c21e42c |
462 | } while (!kthread_should_stop()); |
463 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
464 | (unsigned long)data, iter); |
465 | for_each_online_cpu(i) { |
466 | printk("trylock interrupt readers on CPU %i, " |
467 | "iterations %lu, " |
468 | "successful iterations : %lu\n", |
469 | i, per_cpu(trylock_int_iter, i), |
470 | per_cpu(trylock_int_success, i)); |
68f25f81 |
471 | per_cpu(trylock_int_iter, i) = 0; |
472 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
473 | } |
474 | return 0; |
475 | } |
476 | |
f0a36bb1 |
477 | static int writer_thread(void *data) |
478 | { |
479 | int i; |
6ef60a84 |
480 | int new, prev, cur; |
f0a36bb1 |
481 | unsigned long iter = 0; |
5b23bc48 |
482 | cycles_t time1, time2, delay; |
483 | cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0; |
484 | cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0; |
f0a36bb1 |
485 | |
486 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
487 | do { |
488 | iter++; |
0cb746e2 |
489 | #if (!TEST_PREEMPT) |
490 | preempt_disable(); |
491 | #endif |
68f25f81 |
492 | rdtsc_barrier(); |
7f563886 |
493 | time1 = get_cycles(); |
68f25f81 |
494 | rdtsc_barrier(); |
495 | |
cd7cf33d |
496 | wrap_write_lock(); |
68f25f81 |
497 | |
498 | rdtsc_barrier(); |
7f563886 |
499 | time2 = get_cycles(); |
68f25f81 |
500 | rdtsc_barrier(); |
501 | delay = time2 - time1; |
5b23bc48 |
502 | ldelaymax = max(ldelaymax, delay); |
503 | ldelaymin = min(ldelaymin, delay); |
504 | ldelayavg += delay; |
6ef60a84 |
505 | /* |
506 | * Read the previous values, check that they are coherent. |
507 | */ |
508 | prev = var[0]; |
509 | for (i = 1; i < NR_VARS; i++) { |
510 | cur = var[i]; |
511 | if (cur != prev) |
512 | printk(KERN_ALERT |
513 | "Unequal cur %d/prev %d at i %d, iter %lu " |
514 | "in writer thread\n", |
515 | cur, prev, i, iter); |
516 | } |
f0a36bb1 |
517 | new = (int)get_cycles(); |
518 | for (i = 0; i < NR_VARS; i++) { |
519 | var[i] = new; |
520 | } |
cd7cf33d |
521 | |
5b23bc48 |
522 | rdtsc_barrier(); |
523 | time1 = get_cycles(); |
524 | rdtsc_barrier(); |
525 | |
cd7cf33d |
526 | wrap_write_unlock(); |
527 | |
5b23bc48 |
528 | rdtsc_barrier(); |
529 | time2 = get_cycles(); |
530 | rdtsc_barrier(); |
531 | delay = time2 - time1; |
532 | udelaymax = max(udelaymax, delay); |
533 | udelaymin = min(udelaymin, delay); |
534 | udelayavg += delay; |
535 | |
0cb746e2 |
536 | #if (!TEST_PREEMPT) |
537 | preempt_enable(); |
538 | #endif |
89889f86 |
539 | if (WRITER_DELAY > 0) |
4d1751f9 |
540 | udelay(WRITER_DELAY); |
0cb746e2 |
541 | cpu_relax(); /* |
542 | * make sure we don't busy-loop faster than |
543 | * the lock busy-loop, it would cause reader and |
544 | * writer starvation. |
545 | */ |
6ef60a84 |
546 | yield_in_non_preempt(); |
f0a36bb1 |
547 | } while (!kthread_should_stop()); |
5b23bc48 |
548 | ldelayavg /= iter; |
549 | udelayavg /= iter; |
7f563886 |
550 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
551 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
552 | (unsigned long)data, iter, |
8314e111 |
553 | calibrate_cycles(ldelaymin), |
554 | calibrate_cycles(ldelayavg), |
555 | calibrate_cycles(ldelaymax)); |
5b23bc48 |
556 | printk("writer_thread/%lu iterations : %lu, " |
557 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
558 | (unsigned long)data, iter, |
559 | calibrate_cycles(udelaymin), |
560 | calibrate_cycles(udelayavg), |
561 | calibrate_cycles(udelaymax)); |
f0a36bb1 |
562 | return 0; |
563 | } |
564 | |
cd7cf33d |
565 | static int trylock_writer_thread(void *data) |
566 | { |
567 | int i; |
568 | int new; |
569 | unsigned long iter = 0, success = 0, fail = 0; |
570 | |
571 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
572 | do { |
6ef60a84 |
573 | #if ((!TEST_PREEMPT) && (!TEST_STD_RWLOCK)) |
574 | preempt_disable(); |
575 | #endif |
576 | |
577 | #if (TEST_STD_RWLOCK && TEST_INTERRUPTS) |
cd7cf33d |
578 | /* std write trylock cannot disable interrupts. */ |
579 | local_irq_disable(); |
580 | #endif |
581 | |
582 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
583 | for (;;) { |
584 | iter++; |
6ef60a84 |
585 | if (wrap_write_trylock()) |
cd7cf33d |
586 | goto locked; |
6ef60a84 |
587 | cpu_relax(); |
cd7cf33d |
588 | } |
589 | #else |
590 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
591 | iter++; |
6ef60a84 |
592 | if (wrap_write_trylock()) |
cd7cf33d |
593 | goto locked; |
6ef60a84 |
594 | cpu_relax(); |
cd7cf33d |
595 | } |
596 | #endif |
597 | fail++; |
cd7cf33d |
598 | |
6ef60a84 |
599 | #if (TEST_STD_RWLOCK && TEST_INTERRUPTS) |
600 | local_irq_enable(); |
0cb746e2 |
601 | #endif |
cd7cf33d |
602 | |
6ef60a84 |
603 | #if ((!TEST_PREEMPT) && (!TEST_STD_RWLOCK)) |
604 | preempt_enable(); |
4fd25765 |
605 | #endif |
4fd25765 |
606 | goto loop; |
607 | locked: |
1c21e42c |
608 | success++; |
1c21e42c |
609 | new = (int)get_cycles(); |
610 | for (i = 0; i < NR_VARS; i++) { |
611 | var[i] = new; |
612 | } |
992fbe0f |
613 | wrap_write_unlock(); |
6ef60a84 |
614 | #if ((!TEST_PREEMPT) && (!TEST_STD_RWLOCK)) |
0cb746e2 |
615 | preempt_enable(); |
616 | #endif |
6ef60a84 |
617 | loop: |
4fd25765 |
618 | if (TRYLOCK_WRITER_DELAY > 0) |
619 | udelay(TRYLOCK_WRITER_DELAY); |
0cb746e2 |
620 | cpu_relax(); /* |
621 | * make sure we don't busy-loop faster than |
622 | * the lock busy-loop, it would cause reader and |
623 | * writer starvation. |
624 | */ |
6ef60a84 |
625 | yield_in_non_preempt(); |
1c21e42c |
626 | } while (!kthread_should_stop()); |
4fd25765 |
627 | printk("trylock_writer_thread/%lu iterations : " |
628 | "[try,success,fail after %d try], " |
629 | "%lu,%lu,%lu\n", |
630 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
631 | iter, success, fail); |
1c21e42c |
632 | return 0; |
633 | } |
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 | |
6ef60a84 |
745 | #if (NR_WRITERS) |
68f25f81 |
746 | printk("** Single writer test, no contention **\n"); |
dac86829 |
747 | wbias_rwlock_profile_latency_reset(); |
68f25f81 |
748 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
749 | "wbiasrwlock_writer"); |
68f25f81 |
750 | BUG_ON(!writer_threads[0]); |
751 | ssleep(SINGLE_WRITER_TEST_DURATION); |
752 | kthread_stop(writer_threads[0]); |
193771da |
753 | printk("\n"); |
68f25f81 |
754 | |
dac86829 |
755 | wbias_rwlock_profile_latency_print(); |
6ef60a84 |
756 | #endif |
dac86829 |
757 | |
6ef60a84 |
758 | #if (NR_TRYLOCK_WRITERS) |
4fd25765 |
759 | printk("** Single trylock writer test, no contention **\n"); |
dac86829 |
760 | wbias_rwlock_profile_latency_reset(); |
4fd25765 |
761 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
762 | (void *)0, |
0e0fdeb6 |
763 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
764 | BUG_ON(!trylock_writer_threads[0]); |
765 | ssleep(SINGLE_WRITER_TEST_DURATION); |
766 | kthread_stop(trylock_writer_threads[0]); |
193771da |
767 | printk("\n"); |
4fd25765 |
768 | |
dac86829 |
769 | wbias_rwlock_profile_latency_print(); |
6ef60a84 |
770 | #endif |
dac86829 |
771 | |
6ef60a84 |
772 | #if (TEST_PREEMPT) |
1f5845d5 |
773 | printk("** Single preemptable reader test, no contention **\n"); |
774 | wbias_rwlock_profile_latency_reset(); |
775 | preader_threads[0] = kthread_run(preader_thread, (void *)0, |
776 | "wbiasrwlock_preader"); |
777 | BUG_ON(!preader_threads[0]); |
778 | ssleep(SINGLE_READER_TEST_DURATION); |
779 | kthread_stop(preader_threads[0]); |
780 | printk("\n"); |
781 | |
782 | wbias_rwlock_profile_latency_print(); |
6ef60a84 |
783 | #endif |
1f5845d5 |
784 | |
785 | printk("** Single non-preemptable reader test, no contention **\n"); |
dac86829 |
786 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
787 | npreader_threads[0] = kthread_run(npreader_thread, (void *)0, |
788 | "wbiasrwlock_npreader"); |
789 | BUG_ON(!npreader_threads[0]); |
68f25f81 |
790 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
791 | kthread_stop(npreader_threads[0]); |
193771da |
792 | printk("\n"); |
68f25f81 |
793 | |
dac86829 |
794 | wbias_rwlock_profile_latency_print(); |
795 | |
1f5845d5 |
796 | printk("** Multiple p/non-p readers test, no contention **\n"); |
dac86829 |
797 | wbias_rwlock_profile_latency_reset(); |
0cb746e2 |
798 | #if (TEST_PREEMPT) |
1f5845d5 |
799 | for (i = 0; i < NR_PREADERS; i++) { |
800 | printk("starting preader thread %lu\n", i); |
801 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
802 | "wbiasrwlock_preader"); |
803 | BUG_ON(!preader_threads[i]); |
804 | } |
0cb746e2 |
805 | #endif |
1f5845d5 |
806 | for (i = 0; i < NR_NPREADERS; i++) { |
807 | printk("starting npreader thread %lu\n", i); |
808 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
809 | "wbiasrwlock_npreader"); |
810 | BUG_ON(!npreader_threads[i]); |
68f25f81 |
811 | } |
812 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
813 | for (i = 0; i < NR_NPREADERS; i++) |
814 | kthread_stop(npreader_threads[i]); |
0cb746e2 |
815 | #if (TEST_PREEMPT) |
1f5845d5 |
816 | for (i = 0; i < NR_PREADERS; i++) |
817 | kthread_stop(preader_threads[i]); |
0cb746e2 |
818 | #endif |
193771da |
819 | printk("\n"); |
68f25f81 |
820 | |
dac86829 |
821 | wbias_rwlock_profile_latency_print(); |
822 | |
68f25f81 |
823 | printk("** High contention test **\n"); |
dac86829 |
824 | wbias_rwlock_profile_latency_reset(); |
0e0fdeb6 |
825 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
826 | ssleep(TEST_DURATION); |
0e0fdeb6 |
827 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
193771da |
828 | printk("\n"); |
dac86829 |
829 | wbias_rwlock_profile_latency_print(); |
f0a36bb1 |
830 | |
831 | return -EPERM; |
832 | } |
833 | |
834 | |
835 | static struct file_operations my_operations = { |
836 | .open = my_open, |
837 | }; |
838 | |
839 | int init_module(void) |
840 | { |
0e0fdeb6 |
841 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
842 | if (pentry) |
843 | pentry->proc_fops = &my_operations; |
844 | |
6ef60a84 |
845 | printk("UC_READER_MASK : %08X\n", UC_READER_MASK); |
846 | printk("UC_HARDIRQ_R_MASK: %08X\n", UC_HARDIRQ_READER_MASK); |
847 | printk("UC_SOFTIRQ_R_MASK: %08X\n", UC_SOFTIRQ_READER_MASK); |
848 | printk("UC_NPTHREA_R_MASK: %08X\n", UC_NPTHREAD_READER_MASK); |
849 | printk("UC_PTHREAD_R_MASK: %08X\n", UC_PTHREAD_READER_MASK); |
850 | printk("UC_WRITER : %08X\n", UC_WRITER); |
851 | printk("UC_SLOW_WRITER : %08X\n", UC_SLOW_WRITER); |
852 | printk("UC_WQ_ACTIVE : %08X\n", UC_WQ_ACTIVE); |
853 | printk("WS_MASK : %08X\n", WS_MASK); |
854 | printk("WS_WQ_MUTEX : %08X\n", WS_WQ_MUTEX); |
855 | printk("WS_COUNT_MUTEX : %08X\n", WS_COUNT_MUTEX); |
856 | printk("WS_LOCK_MUTEX : %08X\n", WS_LOCK_MUTEX); |
857 | printk("CTX_RMASK : %016lX\n", CTX_RMASK); |
858 | printk("CTX_WMASK : %016lX\n", CTX_WMASK); |
f0a36bb1 |
859 | |
860 | return 0; |
861 | } |
862 | |
863 | void cleanup_module(void) |
864 | { |
0e0fdeb6 |
865 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
866 | } |
867 | |
868 | MODULE_LICENSE("GPL"); |
869 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
870 | MODULE_DESCRIPTION("wbias rwlock test"); |