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]; |
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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 | |
7e9c6d5a |
117 | #if (TEST_INTERRUPTS) |
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118 | #if (TEST_PREEMPT) |
7e9c6d5a |
119 | #define WBIASRWLOCKMASK (BW_WPTHREAD | BW_RIRQ | BW_RNPTHREAD | BW_RPTHREAD) |
120 | #else |
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121 | #define WBIASRWLOCKMASK (BW_WNPTHREAD | BW_RIRQ | BW_RNPTHREAD) |
122 | #endif |
123 | #else |
7e9c6d5a |
124 | #if (TEST_PREEMPT) |
125 | #define WBIASRWLOCKMASK (BW_WPTHREAD | BW_RNPTHREAD | BW_RPTHREAD) |
126 | #else |
0cb746e2 |
127 | #define WBIASRWLOCKMASK (BW_WNPTHREAD | BW_RNPTHREAD) |
7e9c6d5a |
128 | #endif |
129 | #endif |
130 | static DEFINE_WBIAS_RWLOCK(wbiasrwlock, WBIASRWLOCKMASK); |
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131 | CHECK_WBIAS_RWLOCK_MAP(wbiasrwlock, WBIASRWLOCKMASK); |
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132 | |
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133 | |
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134 | #if (TEST_PREEMPT) |
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135 | #define wrap_read_lock() wbias_read_lock(&wbiasrwlock) |
136 | #define wrap_read_trylock() wbias_read_trylock(&wbiasrwlock) |
137 | #define wrap_read_unlock() wbias_read_unlock(&wbiasrwlock) |
0cb746e2 |
138 | #else |
139 | #define wrap_read_lock() wbias_read_lock_inatomic(&wbiasrwlock) |
140 | #define wrap_read_trylock() wbias_read_trylock_inatomic(&wbiasrwlock) |
141 | #define wrap_read_unlock() wbias_read_unlock_inatomic(&wbiasrwlock) |
142 | #endif |
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143 | |
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144 | #define wrap_read_lock_inatomic() wbias_read_lock_inatomic(&wbiasrwlock) |
145 | #define wrap_read_trylock_inatomic() \ |
146 | wbias_read_trylock_inatomic(&wbiasrwlock) |
147 | #define wrap_read_unlock_inatomic() \ |
148 | wbias_read_unlock_inatomic(&wbiasrwlock) |
149 | |
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150 | #define wrap_read_lock_irq() wbias_read_lock_irq(&wbiasrwlock) |
151 | #define wrap_read_trylock_irq() wbias_read_trylock_irq(&wbiasrwlock) |
152 | #define wrap_read_unlock_irq() wbias_read_unlock_irq(&wbiasrwlock) |
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153 | |
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154 | #define wrap_write_lock() \ |
155 | wbias_write_lock(&wbiasrwlock, WBIASRWLOCKMASK) |
156 | #define wrap_write_unlock() \ |
157 | wbias_write_unlock(&wbiasrwlock, WBIASRWLOCKMASK) |
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158 | #define wrap_write_trylock_else_subscribe() \ |
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159 | wbias_write_trylock_else_subscribe(&wbiasrwlock, WBIASRWLOCKMASK) |
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160 | #define wrap_write_trylock_subscribed() \ |
7e9c6d5a |
161 | wbias_write_trylock_subscribed(&wbiasrwlock, WBIASRWLOCKMASK) |
5b23bc48 |
162 | #define wrap_write_unsubscribe() \ |
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163 | wbias_write_unsubscribe(&wbiasrwlock, WBIASRWLOCKMASK) |
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164 | |
165 | #endif |
166 | |
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167 | static cycles_t cycles_calibration_min, |
168 | cycles_calibration_avg, |
169 | cycles_calibration_max; |
170 | |
171 | static inline cycles_t calibrate_cycles(cycles_t cycles) |
172 | { |
173 | return cycles - cycles_calibration_avg; |
174 | } |
175 | |
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176 | struct proc_dir_entry *pentry = NULL; |
177 | |
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178 | static int p_or_np_reader_thread(const char *typename, |
179 | void *data, int preemptable) |
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180 | { |
181 | int i; |
182 | int prev, cur; |
183 | unsigned long iter = 0; |
5b23bc48 |
184 | cycles_t time1, time2, delay; |
185 | cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0; |
186 | cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0; |
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187 | |
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188 | printk("%s/%lu runnning\n", typename, (unsigned long)data); |
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189 | do { |
190 | iter++; |
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191 | if (!preemptable) |
192 | preempt_disable(); |
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193 | rdtsc_barrier(); |
7f563886 |
194 | time1 = get_cycles(); |
68f25f81 |
195 | rdtsc_barrier(); |
196 | |
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197 | if (!preemptable) |
198 | wrap_read_lock_inatomic(); |
199 | else |
200 | wrap_read_lock(); |
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201 | |
202 | rdtsc_barrier(); |
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203 | time2 = get_cycles(); |
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204 | rdtsc_barrier(); |
205 | delay = time2 - time1; |
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206 | ldelaymax = max(ldelaymax, delay); |
207 | ldelaymin = min(ldelaymin, delay); |
208 | ldelayavg += delay; |
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209 | prev = var[0]; |
210 | for (i = 1; i < NR_VARS; i++) { |
211 | cur = var[i]; |
212 | if (cur != prev) |
213 | printk(KERN_ALERT |
214 | "Unequal cur %d/prev %d at i %d, iter %lu " |
215 | "in thread\n", cur, prev, i, iter); |
216 | } |
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217 | |
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218 | rdtsc_barrier(); |
219 | time1 = get_cycles(); |
220 | rdtsc_barrier(); |
221 | |
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222 | if (!preemptable) |
223 | wrap_read_unlock_inatomic(); |
224 | else |
225 | wrap_read_unlock(); |
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226 | rdtsc_barrier(); |
227 | time2 = get_cycles(); |
228 | rdtsc_barrier(); |
229 | delay = time2 - time1; |
230 | udelaymax = max(udelaymax, delay); |
231 | udelaymin = min(udelaymin, delay); |
232 | udelayavg += delay; |
233 | |
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234 | if (!preemptable) |
235 | preempt_enable(); |
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236 | |
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237 | if (THREAD_READER_DELAY) |
238 | msleep(THREAD_READER_DELAY); |
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239 | } while (!kthread_should_stop()); |
4fd25765 |
240 | if (!iter) { |
b37c9208 |
241 | printk("%s/%lu iterations : %lu", typename, |
4fd25765 |
242 | (unsigned long)data, iter); |
243 | } else { |
5b23bc48 |
244 | ldelayavg /= iter; |
245 | udelayavg /= iter; |
b37c9208 |
246 | printk("%s/%lu iterations : %lu, " |
4fd25765 |
247 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
b37c9208 |
248 | typename, |
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249 | (unsigned long)data, iter, |
5b23bc48 |
250 | calibrate_cycles(ldelaymin), |
251 | calibrate_cycles(ldelayavg), |
252 | calibrate_cycles(ldelaymax)); |
253 | printk("%s/%lu iterations : %lu, " |
254 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
255 | typename, |
256 | (unsigned long)data, iter, |
257 | calibrate_cycles(udelaymin), |
258 | calibrate_cycles(udelayavg), |
259 | calibrate_cycles(udelaymax)); |
4fd25765 |
260 | } |
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261 | return 0; |
262 | } |
263 | |
1f5845d5 |
264 | static int preader_thread(void *data) |
265 | { |
b37c9208 |
266 | return p_or_np_reader_thread("preader_thread", data, 1); |
1f5845d5 |
267 | } |
268 | |
269 | static int npreader_thread(void *data) |
270 | { |
b37c9208 |
271 | return p_or_np_reader_thread("npreader_thread", data, 0); |
1f5845d5 |
272 | } |
273 | |
1c21e42c |
274 | static int trylock_reader_thread(void *data) |
275 | { |
276 | int i; |
277 | int prev, cur; |
278 | unsigned long iter = 0, success_iter = 0; |
279 | |
280 | printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data); |
281 | do { |
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282 | #if (!TEST_PREEMPT) |
283 | preempt_disable(); |
284 | #endif |
cd7cf33d |
285 | while (!wrap_read_trylock()) |
1c21e42c |
286 | iter++; |
287 | success_iter++; |
288 | prev = var[0]; |
289 | for (i = 1; i < NR_VARS; i++) { |
290 | cur = var[i]; |
291 | if (cur != prev) |
292 | printk(KERN_ALERT |
293 | "Unequal cur %d/prev %d at i %d, iter %lu " |
294 | "in thread\n", cur, prev, i, iter); |
295 | } |
cd7cf33d |
296 | wrap_read_unlock(); |
0cb746e2 |
297 | #if (!TEST_PREEMPT) |
298 | preempt_enable(); |
299 | #endif |
4fd25765 |
300 | if (THREAD_READER_DELAY) |
301 | msleep(THREAD_READER_DELAY); |
1c21e42c |
302 | } while (!kthread_should_stop()); |
303 | printk("trylock_reader_thread/%lu iterations : %lu, " |
304 | "successful iterations : %lu\n", |
305 | (unsigned long)data, iter, success_iter); |
306 | return 0; |
307 | } |
308 | |
5b23bc48 |
309 | DEFINE_PER_CPU(cycles_t, int_ldelaymin); |
310 | DEFINE_PER_CPU(cycles_t, int_ldelayavg); |
311 | DEFINE_PER_CPU(cycles_t, int_ldelaymax); |
312 | DEFINE_PER_CPU(cycles_t, int_udelaymin); |
313 | DEFINE_PER_CPU(cycles_t, int_udelayavg); |
314 | DEFINE_PER_CPU(cycles_t, int_udelaymax); |
68f25f81 |
315 | DEFINE_PER_CPU(cycles_t, int_ipi_nr); |
7f563886 |
316 | |
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317 | static void interrupt_reader_ipi(void *data) |
318 | { |
319 | int i; |
320 | int prev, cur; |
7f563886 |
321 | cycles_t time1, time2; |
5b23bc48 |
322 | cycles_t *ldelaymax, *ldelaymin, *ldelayavg, *ipi_nr, delay; |
323 | cycles_t *udelaymax, *udelaymin, *udelayavg; |
7f563886 |
324 | |
325 | /* |
326 | * Skip the ipi caller, not in irq context. |
327 | */ |
328 | if (!in_irq()) |
329 | return; |
f0a36bb1 |
330 | |
5b23bc48 |
331 | ldelaymax = &per_cpu(int_ldelaymax, smp_processor_id()); |
332 | ldelaymin = &per_cpu(int_ldelaymin, smp_processor_id()); |
333 | ldelayavg = &per_cpu(int_ldelayavg, smp_processor_id()); |
334 | udelaymax = &per_cpu(int_udelaymax, smp_processor_id()); |
335 | udelaymin = &per_cpu(int_udelaymin, smp_processor_id()); |
336 | udelayavg = &per_cpu(int_udelayavg, smp_processor_id()); |
68f25f81 |
337 | ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id()); |
338 | |
339 | rdtsc_barrier(); |
7f563886 |
340 | time1 = get_cycles(); |
68f25f81 |
341 | rdtsc_barrier(); |
342 | |
cd7cf33d |
343 | wrap_read_lock_irq(); |
68f25f81 |
344 | |
345 | rdtsc_barrier(); |
7f563886 |
346 | time2 = get_cycles(); |
68f25f81 |
347 | rdtsc_barrier(); |
348 | delay = time2 - time1; |
5b23bc48 |
349 | *ldelaymax = max(*ldelaymax, delay); |
350 | *ldelaymin = min(*ldelaymin, delay); |
351 | *ldelayavg += delay; |
68f25f81 |
352 | (*ipi_nr)++; |
f0a36bb1 |
353 | prev = var[0]; |
354 | for (i = 1; i < NR_VARS; i++) { |
355 | cur = var[i]; |
356 | if (cur != prev) |
357 | printk(KERN_ALERT |
358 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
359 | cur, prev, i); |
360 | } |
5b23bc48 |
361 | rdtsc_barrier(); |
362 | time1 = get_cycles(); |
363 | rdtsc_barrier(); |
cd7cf33d |
364 | wrap_read_unlock_irq(); |
5b23bc48 |
365 | time2 = get_cycles(); |
366 | rdtsc_barrier(); |
367 | delay = time2 - time1; |
368 | *udelaymax = max(*udelaymax, delay); |
369 | *udelaymin = min(*udelaymin, delay); |
370 | *udelayavg += delay; |
f0a36bb1 |
371 | } |
372 | |
1c21e42c |
373 | DEFINE_PER_CPU(unsigned long, trylock_int_iter); |
374 | DEFINE_PER_CPU(unsigned long, trylock_int_success); |
375 | |
376 | static void trylock_interrupt_reader_ipi(void *data) |
377 | { |
378 | int i; |
379 | int prev, cur; |
380 | |
381 | /* |
382 | * Skip the ipi caller, not in irq context. |
383 | */ |
384 | if (!in_irq()) |
385 | return; |
386 | |
387 | per_cpu(trylock_int_iter, smp_processor_id())++; |
cd7cf33d |
388 | while (!wrap_read_trylock_irq()) |
1c21e42c |
389 | per_cpu(trylock_int_iter, smp_processor_id())++; |
390 | per_cpu(trylock_int_success, smp_processor_id())++; |
391 | prev = var[0]; |
392 | for (i = 1; i < NR_VARS; i++) { |
393 | cur = var[i]; |
394 | if (cur != prev) |
395 | printk(KERN_ALERT |
396 | "Unequal cur %d/prev %d at i %d in interrupt\n", |
397 | cur, prev, i); |
398 | } |
cd7cf33d |
399 | wrap_read_unlock_irq(); |
1c21e42c |
400 | } |
401 | |
402 | |
f0a36bb1 |
403 | static int interrupt_reader_thread(void *data) |
404 | { |
405 | unsigned long iter = 0; |
7f563886 |
406 | int i; |
407 | |
68f25f81 |
408 | for_each_online_cpu(i) { |
5b23bc48 |
409 | per_cpu(int_ldelaymax, i) = 0; |
410 | per_cpu(int_ldelaymin, i) = ULLONG_MAX; |
411 | per_cpu(int_ldelayavg, i) = 0; |
412 | per_cpu(int_udelaymax, i) = 0; |
413 | per_cpu(int_udelaymin, i) = ULLONG_MAX; |
414 | per_cpu(int_udelayavg, i) = 0; |
68f25f81 |
415 | per_cpu(int_ipi_nr, i) = 0; |
416 | } |
f0a36bb1 |
417 | do { |
418 | iter++; |
419 | on_each_cpu(interrupt_reader_ipi, NULL, 0); |
4fd25765 |
420 | if (INTERRUPT_READER_DELAY) |
421 | msleep(INTERRUPT_READER_DELAY); |
f0a36bb1 |
422 | } while (!kthread_should_stop()); |
423 | printk("interrupt_reader_thread/%lu iterations : %lu\n", |
424 | (unsigned long)data, iter); |
7f563886 |
425 | for_each_online_cpu(i) { |
4fd25765 |
426 | if (!per_cpu(int_ipi_nr, i)) |
427 | continue; |
8314e111 |
428 | per_cpu(int_ldelayavg, i) /= per_cpu(int_ipi_nr, i); |
429 | per_cpu(int_udelayavg, i) /= per_cpu(int_ipi_nr, i); |
7f563886 |
430 | printk("interrupt readers on CPU %i, " |
68f25f81 |
431 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
432 | i, |
5b23bc48 |
433 | calibrate_cycles(per_cpu(int_ldelaymin, i)), |
434 | calibrate_cycles(per_cpu(int_ldelayavg, i)), |
435 | calibrate_cycles(per_cpu(int_ldelaymax, i))); |
436 | printk("interrupt readers on CPU %i, " |
437 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
438 | i, |
439 | calibrate_cycles(per_cpu(int_udelaymin, i)), |
440 | calibrate_cycles(per_cpu(int_udelayavg, i)), |
441 | calibrate_cycles(per_cpu(int_udelaymax, i))); |
7f563886 |
442 | } |
f0a36bb1 |
443 | return 0; |
444 | } |
445 | |
1c21e42c |
446 | static int trylock_interrupt_reader_thread(void *data) |
447 | { |
448 | unsigned long iter = 0; |
449 | int i; |
450 | |
451 | do { |
452 | iter++; |
453 | on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0); |
4fd25765 |
454 | if (INTERRUPT_READER_DELAY) |
455 | msleep(INTERRUPT_READER_DELAY); |
1c21e42c |
456 | } while (!kthread_should_stop()); |
457 | printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n", |
458 | (unsigned long)data, iter); |
459 | for_each_online_cpu(i) { |
460 | printk("trylock interrupt readers on CPU %i, " |
461 | "iterations %lu, " |
462 | "successful iterations : %lu\n", |
463 | i, per_cpu(trylock_int_iter, i), |
464 | per_cpu(trylock_int_success, i)); |
68f25f81 |
465 | per_cpu(trylock_int_iter, i) = 0; |
466 | per_cpu(trylock_int_success, i) = 0; |
1c21e42c |
467 | } |
468 | return 0; |
469 | } |
470 | |
f0a36bb1 |
471 | static int writer_thread(void *data) |
472 | { |
473 | int i; |
474 | int new; |
475 | unsigned long iter = 0; |
5b23bc48 |
476 | cycles_t time1, time2, delay; |
477 | cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0; |
478 | cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0; |
f0a36bb1 |
479 | |
480 | printk("writer_thread/%lu runnning\n", (unsigned long)data); |
481 | do { |
482 | iter++; |
0cb746e2 |
483 | #if (!TEST_PREEMPT) |
484 | preempt_disable(); |
485 | #endif |
68f25f81 |
486 | rdtsc_barrier(); |
7f563886 |
487 | time1 = get_cycles(); |
68f25f81 |
488 | rdtsc_barrier(); |
489 | |
cd7cf33d |
490 | wrap_write_lock(); |
68f25f81 |
491 | |
492 | rdtsc_barrier(); |
7f563886 |
493 | time2 = get_cycles(); |
68f25f81 |
494 | rdtsc_barrier(); |
495 | delay = time2 - time1; |
5b23bc48 |
496 | ldelaymax = max(ldelaymax, delay); |
497 | ldelaymin = min(ldelaymin, delay); |
498 | ldelayavg += delay; |
f0a36bb1 |
499 | new = (int)get_cycles(); |
500 | for (i = 0; i < NR_VARS; i++) { |
501 | var[i] = new; |
502 | } |
cd7cf33d |
503 | |
5b23bc48 |
504 | rdtsc_barrier(); |
505 | time1 = get_cycles(); |
506 | rdtsc_barrier(); |
507 | |
cd7cf33d |
508 | wrap_write_unlock(); |
509 | |
5b23bc48 |
510 | rdtsc_barrier(); |
511 | time2 = get_cycles(); |
512 | rdtsc_barrier(); |
513 | delay = time2 - time1; |
514 | udelaymax = max(udelaymax, delay); |
515 | udelaymin = min(udelaymin, delay); |
516 | udelayavg += delay; |
517 | |
0cb746e2 |
518 | #if (!TEST_PREEMPT) |
519 | preempt_enable(); |
520 | #endif |
89889f86 |
521 | if (WRITER_DELAY > 0) |
4d1751f9 |
522 | udelay(WRITER_DELAY); |
0cb746e2 |
523 | cpu_relax(); /* |
524 | * make sure we don't busy-loop faster than |
525 | * the lock busy-loop, it would cause reader and |
526 | * writer starvation. |
527 | */ |
f0a36bb1 |
528 | } while (!kthread_should_stop()); |
5b23bc48 |
529 | ldelayavg /= iter; |
530 | udelayavg /= iter; |
7f563886 |
531 | printk("writer_thread/%lu iterations : %lu, " |
68f25f81 |
532 | "lock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
533 | (unsigned long)data, iter, |
8314e111 |
534 | calibrate_cycles(ldelaymin), |
535 | calibrate_cycles(ldelayavg), |
536 | calibrate_cycles(ldelaymax)); |
5b23bc48 |
537 | printk("writer_thread/%lu iterations : %lu, " |
538 | "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n", |
539 | (unsigned long)data, iter, |
540 | calibrate_cycles(udelaymin), |
541 | calibrate_cycles(udelayavg), |
542 | calibrate_cycles(udelaymax)); |
f0a36bb1 |
543 | return 0; |
544 | } |
545 | |
cd7cf33d |
546 | #if (TEST_STD_RWLOCK) |
547 | static int trylock_writer_thread(void *data) |
548 | { |
549 | int i; |
550 | int new; |
551 | unsigned long iter = 0, success = 0, fail = 0; |
552 | |
553 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
554 | do { |
555 | #if (TEST_INTERRUPTS) |
556 | /* std write trylock cannot disable interrupts. */ |
557 | local_irq_disable(); |
558 | #endif |
559 | |
560 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
561 | for (;;) { |
562 | iter++; |
563 | if (write_trylock(&std_rw_lock)) |
564 | goto locked; |
565 | } |
566 | #else |
567 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) { |
568 | iter++; |
569 | if (write_trylock(&std_rw_lock)) |
570 | goto locked; |
571 | } |
572 | #endif |
573 | fail++; |
574 | #if (TEST_INTERRUPTS) |
575 | local_irq_enable(); |
576 | #endif |
577 | goto loop; |
578 | locked: |
579 | success++; |
580 | new = (int)get_cycles(); |
581 | for (i = 0; i < NR_VARS; i++) { |
582 | var[i] = new; |
583 | } |
584 | #if (TEST_INTERRUPTS) |
585 | write_unlock_irq(&std_rw_lock); |
586 | #else |
587 | write_unlock(&std_rw_lock); |
588 | #endif |
589 | loop: |
590 | if (TRYLOCK_WRITER_DELAY > 0) |
591 | udelay(TRYLOCK_WRITER_DELAY); |
0cb746e2 |
592 | cpu_relax(); /* |
593 | * make sure we don't busy-loop faster than |
594 | * the lock busy-loop, it would cause reader and |
595 | * writer starvation. |
596 | */ |
cd7cf33d |
597 | } while (!kthread_should_stop()); |
598 | printk("trylock_writer_thread/%lu iterations : " |
599 | "[try,success,fail after %d try], " |
600 | "%lu,%lu,%lu\n", |
601 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
602 | iter, success, fail); |
603 | return 0; |
604 | } |
605 | |
606 | #else /* !TEST_STD_RWLOCK */ |
607 | |
1c21e42c |
608 | static int trylock_writer_thread(void *data) |
609 | { |
610 | int i; |
611 | int new; |
4fd25765 |
612 | unsigned long iter = 0, success = 0, fail = 0; |
1c21e42c |
613 | |
614 | printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data); |
615 | do { |
4fd25765 |
616 | iter++; |
0cb746e2 |
617 | #if (!TEST_PREEMPT) |
618 | preempt_disable(); |
619 | #endif |
992fbe0f |
620 | if (wrap_write_trylock_else_subscribe()) |
4fd25765 |
621 | goto locked; |
cd7cf33d |
622 | |
4fd25765 |
623 | #if (TRYLOCK_WRITERS_FAIL_ITER == -1) |
624 | for (;;) { |
1c21e42c |
625 | iter++; |
992fbe0f |
626 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
627 | goto locked; |
1c21e42c |
628 | } |
4fd25765 |
629 | #else |
cd7cf33d |
630 | for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER - 1; i++) { |
4fd25765 |
631 | iter++; |
992fbe0f |
632 | if (wrap_write_trylock_subscribed()) |
4fd25765 |
633 | goto locked; |
634 | } |
635 | #endif |
636 | fail++; |
5b23bc48 |
637 | wrap_write_unsubscribe(); |
4fd25765 |
638 | goto loop; |
639 | locked: |
1c21e42c |
640 | success++; |
1c21e42c |
641 | new = (int)get_cycles(); |
642 | for (i = 0; i < NR_VARS; i++) { |
643 | var[i] = new; |
644 | } |
992fbe0f |
645 | wrap_write_unlock(); |
4fd25765 |
646 | loop: |
0cb746e2 |
647 | #if (!TEST_PREEMPT) |
648 | preempt_enable(); |
649 | #endif |
4fd25765 |
650 | if (TRYLOCK_WRITER_DELAY > 0) |
651 | udelay(TRYLOCK_WRITER_DELAY); |
0cb746e2 |
652 | cpu_relax(); /* |
653 | * make sure we don't busy-loop faster than |
654 | * the lock busy-loop, it would cause reader and |
655 | * writer starvation. |
656 | */ |
1c21e42c |
657 | } while (!kthread_should_stop()); |
4fd25765 |
658 | printk("trylock_writer_thread/%lu iterations : " |
659 | "[try,success,fail after %d try], " |
660 | "%lu,%lu,%lu\n", |
661 | (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER, |
662 | iter, success, fail); |
1c21e42c |
663 | return 0; |
664 | } |
665 | |
cd7cf33d |
666 | #endif /* TEST_STD_RWLOCK */ |
667 | |
0e0fdeb6 |
668 | static void wbias_rwlock_create(void) |
f0a36bb1 |
669 | { |
670 | unsigned long i; |
671 | |
1f5845d5 |
672 | for (i = 0; i < NR_PREADERS; i++) { |
673 | printk("starting preemptable reader thread %lu\n", i); |
674 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
675 | "wbiasrwlock_preader"); |
676 | BUG_ON(!preader_threads[i]); |
677 | } |
678 | |
679 | for (i = 0; i < NR_NPREADERS; i++) { |
680 | printk("starting non-preemptable reader thread %lu\n", i); |
681 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
682 | "wbiasrwlock_npreader"); |
683 | BUG_ON(!npreader_threads[i]); |
f0a36bb1 |
684 | } |
685 | |
1c21e42c |
686 | for (i = 0; i < NR_TRYLOCK_READERS; i++) { |
687 | printk("starting trylock reader thread %lu\n", i); |
688 | trylock_reader_threads[i] = kthread_run(trylock_reader_thread, |
0e0fdeb6 |
689 | (void *)i, "wbiasrwlock_trylock_reader"); |
1c21e42c |
690 | BUG_ON(!trylock_reader_threads[i]); |
691 | } |
4fd25765 |
692 | for (i = 0; i < NR_INTERRUPT_READERS; i++) { |
693 | printk("starting interrupt reader %lu\n", i); |
694 | interrupt_reader[i] = kthread_run(interrupt_reader_thread, |
695 | (void *)i, |
0e0fdeb6 |
696 | "wbiasrwlock_interrupt_reader"); |
4fd25765 |
697 | } |
698 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) { |
699 | printk("starting trylock interrupt reader %lu\n", i); |
700 | trylock_interrupt_reader[i] = |
701 | kthread_run(trylock_interrupt_reader_thread, |
0e0fdeb6 |
702 | (void *)i, "wbiasrwlock_trylock_interrupt_reader"); |
4fd25765 |
703 | } |
f0a36bb1 |
704 | for (i = 0; i < NR_WRITERS; i++) { |
705 | printk("starting writer thread %lu\n", i); |
706 | writer_threads[i] = kthread_run(writer_thread, (void *)i, |
0e0fdeb6 |
707 | "wbiasrwlock_writer"); |
f0a36bb1 |
708 | BUG_ON(!writer_threads[i]); |
709 | } |
1c21e42c |
710 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) { |
711 | printk("starting trylock writer thread %lu\n", i); |
712 | trylock_writer_threads[i] = kthread_run(trylock_writer_thread, |
0e0fdeb6 |
713 | (void *)i, "wbiasrwlock_trylock_writer"); |
1c21e42c |
714 | BUG_ON(!trylock_writer_threads[i]); |
715 | } |
f0a36bb1 |
716 | } |
717 | |
0e0fdeb6 |
718 | static void wbias_rwlock_stop(void) |
f0a36bb1 |
719 | { |
720 | unsigned long i; |
721 | |
1c21e42c |
722 | for (i = 0; i < NR_WRITERS; i++) |
7f563886 |
723 | kthread_stop(writer_threads[i]); |
1c21e42c |
724 | for (i = 0; i < NR_TRYLOCK_WRITERS; i++) |
725 | kthread_stop(trylock_writer_threads[i]); |
1f5845d5 |
726 | for (i = 0; i < NR_NPREADERS; i++) |
727 | kthread_stop(npreader_threads[i]); |
728 | for (i = 0; i < NR_PREADERS; i++) |
729 | kthread_stop(preader_threads[i]); |
1c21e42c |
730 | for (i = 0; i < NR_TRYLOCK_READERS; i++) |
731 | kthread_stop(trylock_reader_threads[i]); |
4fd25765 |
732 | for (i = 0; i < NR_INTERRUPT_READERS; i++) |
733 | kthread_stop(interrupt_reader[i]); |
734 | for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) |
735 | kthread_stop(trylock_interrupt_reader[i]); |
f0a36bb1 |
736 | } |
737 | |
738 | |
739 | static void perform_test(const char *name, void (*callback)(void)) |
740 | { |
741 | printk("%s\n", name); |
742 | callback(); |
743 | } |
744 | |
745 | static int my_open(struct inode *inode, struct file *file) |
746 | { |
68f25f81 |
747 | unsigned long i; |
748 | cycles_t time1, time2, delay; |
749 | |
750 | printk("** get_cycles calibration **\n"); |
751 | cycles_calibration_min = ULLONG_MAX; |
752 | cycles_calibration_avg = 0; |
753 | cycles_calibration_max = 0; |
754 | |
755 | local_irq_disable(); |
756 | for (i = 0; i < 10; i++) { |
757 | rdtsc_barrier(); |
758 | time1 = get_cycles(); |
759 | rdtsc_barrier(); |
760 | rdtsc_barrier(); |
761 | time2 = get_cycles(); |
762 | rdtsc_barrier(); |
763 | delay = time2 - time1; |
764 | cycles_calibration_min = min(cycles_calibration_min, delay); |
765 | cycles_calibration_avg += delay; |
766 | cycles_calibration_max = max(cycles_calibration_max, delay); |
767 | } |
768 | cycles_calibration_avg /= 10; |
769 | local_irq_enable(); |
770 | |
771 | printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, " |
772 | "results calibrated on avg\n", |
773 | cycles_calibration_min, |
774 | cycles_calibration_avg, |
775 | cycles_calibration_max); |
193771da |
776 | printk("\n"); |
68f25f81 |
777 | |
778 | printk("** Single writer test, no contention **\n"); |
dac86829 |
779 | wbias_rwlock_profile_latency_reset(); |
68f25f81 |
780 | writer_threads[0] = kthread_run(writer_thread, (void *)0, |
0e0fdeb6 |
781 | "wbiasrwlock_writer"); |
68f25f81 |
782 | BUG_ON(!writer_threads[0]); |
783 | ssleep(SINGLE_WRITER_TEST_DURATION); |
784 | kthread_stop(writer_threads[0]); |
193771da |
785 | printk("\n"); |
68f25f81 |
786 | |
dac86829 |
787 | wbias_rwlock_profile_latency_print(); |
788 | |
4fd25765 |
789 | printk("** Single trylock writer test, no contention **\n"); |
dac86829 |
790 | wbias_rwlock_profile_latency_reset(); |
4fd25765 |
791 | trylock_writer_threads[0] = kthread_run(trylock_writer_thread, |
792 | (void *)0, |
0e0fdeb6 |
793 | "trylock_wbiasrwlock_writer"); |
4fd25765 |
794 | BUG_ON(!trylock_writer_threads[0]); |
795 | ssleep(SINGLE_WRITER_TEST_DURATION); |
796 | kthread_stop(trylock_writer_threads[0]); |
193771da |
797 | printk("\n"); |
4fd25765 |
798 | |
dac86829 |
799 | wbias_rwlock_profile_latency_print(); |
800 | |
1f5845d5 |
801 | printk("** Single preemptable reader test, no contention **\n"); |
802 | wbias_rwlock_profile_latency_reset(); |
803 | preader_threads[0] = kthread_run(preader_thread, (void *)0, |
804 | "wbiasrwlock_preader"); |
805 | BUG_ON(!preader_threads[0]); |
806 | ssleep(SINGLE_READER_TEST_DURATION); |
807 | kthread_stop(preader_threads[0]); |
808 | printk("\n"); |
809 | |
810 | wbias_rwlock_profile_latency_print(); |
811 | |
292f0110 |
812 | #if (TEST_PREEMPT) |
1f5845d5 |
813 | printk("** Single non-preemptable reader test, no contention **\n"); |
dac86829 |
814 | wbias_rwlock_profile_latency_reset(); |
1f5845d5 |
815 | npreader_threads[0] = kthread_run(npreader_thread, (void *)0, |
816 | "wbiasrwlock_npreader"); |
817 | BUG_ON(!npreader_threads[0]); |
68f25f81 |
818 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
819 | kthread_stop(npreader_threads[0]); |
193771da |
820 | printk("\n"); |
68f25f81 |
821 | |
dac86829 |
822 | wbias_rwlock_profile_latency_print(); |
292f0110 |
823 | #endif |
dac86829 |
824 | |
1f5845d5 |
825 | printk("** Multiple p/non-p readers test, no contention **\n"); |
dac86829 |
826 | wbias_rwlock_profile_latency_reset(); |
0cb746e2 |
827 | #if (TEST_PREEMPT) |
1f5845d5 |
828 | for (i = 0; i < NR_PREADERS; i++) { |
829 | printk("starting preader thread %lu\n", i); |
830 | preader_threads[i] = kthread_run(preader_thread, (void *)i, |
831 | "wbiasrwlock_preader"); |
832 | BUG_ON(!preader_threads[i]); |
833 | } |
0cb746e2 |
834 | #endif |
1f5845d5 |
835 | for (i = 0; i < NR_NPREADERS; i++) { |
836 | printk("starting npreader thread %lu\n", i); |
837 | npreader_threads[i] = kthread_run(npreader_thread, (void *)i, |
838 | "wbiasrwlock_npreader"); |
839 | BUG_ON(!npreader_threads[i]); |
68f25f81 |
840 | } |
841 | ssleep(SINGLE_READER_TEST_DURATION); |
1f5845d5 |
842 | for (i = 0; i < NR_NPREADERS; i++) |
843 | kthread_stop(npreader_threads[i]); |
0cb746e2 |
844 | #if (TEST_PREEMPT) |
1f5845d5 |
845 | for (i = 0; i < NR_PREADERS; i++) |
846 | kthread_stop(preader_threads[i]); |
0cb746e2 |
847 | #endif |
193771da |
848 | printk("\n"); |
68f25f81 |
849 | |
dac86829 |
850 | wbias_rwlock_profile_latency_print(); |
851 | |
68f25f81 |
852 | printk("** High contention test **\n"); |
dac86829 |
853 | wbias_rwlock_profile_latency_reset(); |
0e0fdeb6 |
854 | perform_test("wbias-rwlock-create", wbias_rwlock_create); |
f36c4112 |
855 | ssleep(TEST_DURATION); |
0e0fdeb6 |
856 | perform_test("wbias-rwlock-stop", wbias_rwlock_stop); |
193771da |
857 | printk("\n"); |
dac86829 |
858 | wbias_rwlock_profile_latency_print(); |
f0a36bb1 |
859 | |
860 | return -EPERM; |
861 | } |
862 | |
863 | |
864 | static struct file_operations my_operations = { |
865 | .open = my_open, |
866 | }; |
867 | |
868 | int init_module(void) |
869 | { |
0e0fdeb6 |
870 | pentry = create_proc_entry("testwbiasrwlock", 0444, NULL); |
f0a36bb1 |
871 | if (pentry) |
872 | pentry->proc_fops = &my_operations; |
873 | |
d1f36a28 |
874 | printk("PTHREAD_ROFFSET : %016lX\n", PTHREAD_ROFFSET); |
875 | printk("PTHREAD_RMASK : %016lX\n", PTHREAD_RMASK); |
876 | printk("NPTHREAD_ROFFSET : %016lX\n", NPTHREAD_ROFFSET); |
877 | printk("NPTHREAD_RMASK : %016lX\n", NPTHREAD_RMASK); |
878 | printk("SOFTIRQ_ROFFSET : %016lX\n", SOFTIRQ_ROFFSET); |
879 | printk("SOFTIRQ_RMASK : %016lX\n", SOFTIRQ_RMASK); |
880 | printk("HARDIRQ_ROFFSET : %016lX\n", HARDIRQ_ROFFSET); |
881 | printk("HARDIRQ_RMASK : %016lX\n", HARDIRQ_RMASK); |
882 | printk("PTHREAD_WOFFSET : %016lX\n", PTHREAD_WOFFSET); |
883 | printk("PTHREAD_WMASK : %016lX\n", PTHREAD_WMASK); |
884 | printk("NPTHREAD_WOFFSET : %016lX\n", NPTHREAD_WOFFSET); |
885 | printk("NPTHREAD_WMASK : %016lX\n", NPTHREAD_WMASK); |
886 | printk("WRITER_MUTEX : %016lX\n", WRITER_MUTEX); |
887 | printk("SOFTIRQ_WMASK : %016lX\n", SOFTIRQ_WMASK); |
888 | printk("HARDIRQ_WMASK : %016lX\n", HARDIRQ_WMASK); |
9f10b219 |
889 | printk("WQ_MUTEX : %016lX\n", WQ_MUTEX); |
890 | printk("WQ_ACTIVE : %016lX\n", WQ_ACTIVE); |
f0a36bb1 |
891 | |
892 | return 0; |
893 | } |
894 | |
895 | void cleanup_module(void) |
896 | { |
0e0fdeb6 |
897 | remove_proc_entry("testwbiasrwlock", NULL); |
f0a36bb1 |
898 | } |
899 | |
900 | MODULE_LICENSE("GPL"); |
901 | MODULE_AUTHOR("Mathieu Desnoyers"); |
0e0fdeb6 |
902 | MODULE_DESCRIPTION("wbias rwlock test"); |