Commit | Line | Data |
---|---|---|
02bcaa8c | 1 | /* |
f5cc024a | 2 | * Clock functions |
02bcaa8c | 3 | */ |
f5cc024a | 4 | |
02bcaa8c | 5 | #include <unistd.h> |
c223da83 | 6 | #include <math.h> |
02bcaa8c | 7 | #include <sys/time.h> |
03e20d68 | 8 | #include <time.h> |
02bcaa8c JA |
9 | |
10 | #include "fio.h" | |
be4ecfdf | 11 | #include "smalloc.h" |
02bcaa8c JA |
12 | |
13 | #include "hash.h" | |
7d11f871 | 14 | #include "os/os.h" |
02bcaa8c | 15 | |
09a32402 | 16 | #ifdef ARCH_HAVE_CPU_CLOCK |
c223da83 | 17 | static unsigned long cycles_per_usec; |
71339117 | 18 | static unsigned long inv_cycles_per_usec; |
09a32402 | 19 | #endif |
4de98eb0 | 20 | int tsc_reliable = 0; |
5d879392 JA |
21 | |
22 | struct tv_valid { | |
23 | struct timeval last_tv; | |
ba458c2f | 24 | uint64_t last_cycles; |
5d879392 JA |
25 | int last_tv_valid; |
26 | }; | |
67bf9823 JA |
27 | #ifdef CONFIG_TLS_THREAD |
28 | static struct tv_valid __thread static_tv_valid; | |
29 | #else | |
5d879392 | 30 | static pthread_key_t tv_tls_key; |
67bf9823 | 31 | #endif |
02bcaa8c | 32 | |
16de1bf9 | 33 | enum fio_cs fio_clock_source = FIO_PREFERRED_CLOCK_SOURCE; |
fa80feae | 34 | int fio_clock_source_set = 0; |
01423eae | 35 | enum fio_cs fio_clock_source_inited = CS_INVAL; |
c223da83 | 36 | |
02bcaa8c JA |
37 | #ifdef FIO_DEBUG_TIME |
38 | ||
39 | #define HASH_BITS 8 | |
40 | #define HASH_SIZE (1 << HASH_BITS) | |
41 | ||
01743ee1 | 42 | static struct flist_head hash[HASH_SIZE]; |
02bcaa8c JA |
43 | static int gtod_inited; |
44 | ||
45 | struct gtod_log { | |
01743ee1 | 46 | struct flist_head list; |
02bcaa8c JA |
47 | void *caller; |
48 | unsigned long calls; | |
49 | }; | |
50 | ||
51 | static struct gtod_log *find_hash(void *caller) | |
52 | { | |
53 | unsigned long h = hash_ptr(caller, HASH_BITS); | |
01743ee1 | 54 | struct flist_head *entry; |
02bcaa8c | 55 | |
01743ee1 JA |
56 | flist_for_each(entry, &hash[h]) { |
57 | struct gtod_log *log = flist_entry(entry, struct gtod_log, | |
58 | list); | |
02bcaa8c JA |
59 | |
60 | if (log->caller == caller) | |
61 | return log; | |
62 | } | |
63 | ||
64 | return NULL; | |
65 | } | |
66 | ||
67 | static struct gtod_log *find_log(void *caller) | |
68 | { | |
69 | struct gtod_log *log = find_hash(caller); | |
70 | ||
71 | if (!log) { | |
72 | unsigned long h; | |
73 | ||
74 | log = malloc(sizeof(*log)); | |
01743ee1 | 75 | INIT_FLIST_HEAD(&log->list); |
02bcaa8c JA |
76 | log->caller = caller; |
77 | log->calls = 0; | |
78 | ||
79 | h = hash_ptr(caller, HASH_BITS); | |
01743ee1 | 80 | flist_add_tail(&log->list, &hash[h]); |
02bcaa8c JA |
81 | } |
82 | ||
83 | return log; | |
84 | } | |
85 | ||
86 | static void gtod_log_caller(void *caller) | |
87 | { | |
88 | if (gtod_inited) { | |
89 | struct gtod_log *log = find_log(caller); | |
90 | ||
91 | log->calls++; | |
92 | } | |
93 | } | |
94 | ||
95 | static void fio_exit fio_dump_gtod(void) | |
96 | { | |
97 | unsigned long total_calls = 0; | |
98 | int i; | |
99 | ||
100 | for (i = 0; i < HASH_SIZE; i++) { | |
01743ee1 | 101 | struct flist_head *entry; |
02bcaa8c JA |
102 | struct gtod_log *log; |
103 | ||
01743ee1 JA |
104 | flist_for_each(entry, &hash[i]) { |
105 | log = flist_entry(entry, struct gtod_log, list); | |
02bcaa8c | 106 | |
5ec10eaa JA |
107 | printf("function %p, calls %lu\n", log->caller, |
108 | log->calls); | |
02bcaa8c JA |
109 | total_calls += log->calls; |
110 | } | |
111 | } | |
112 | ||
113 | printf("Total %lu gettimeofday\n", total_calls); | |
114 | } | |
115 | ||
116 | static void fio_init gtod_init(void) | |
117 | { | |
118 | int i; | |
119 | ||
120 | for (i = 0; i < HASH_SIZE; i++) | |
01743ee1 | 121 | INIT_FLIST_HEAD(&hash[i]); |
02bcaa8c JA |
122 | |
123 | gtod_inited = 1; | |
124 | } | |
125 | ||
126 | #endif /* FIO_DEBUG_TIME */ | |
127 | ||
67bf9823 | 128 | #ifdef CONFIG_CLOCK_GETTIME |
9ff1c070 JA |
129 | static int fill_clock_gettime(struct timespec *ts) |
130 | { | |
67bf9823 | 131 | #ifdef CONFIG_CLOCK_MONOTONIC |
9ff1c070 JA |
132 | return clock_gettime(CLOCK_MONOTONIC, ts); |
133 | #else | |
134 | return clock_gettime(CLOCK_REALTIME, ts); | |
135 | #endif | |
136 | } | |
1e97cce9 | 137 | #endif |
67bf9823 JA |
138 | |
139 | static void *__fio_gettime(struct timeval *tp) | |
02bcaa8c | 140 | { |
93f0b09a | 141 | struct tv_valid *tv; |
5d879392 | 142 | |
67bf9823 JA |
143 | #ifdef CONFIG_TLS_THREAD |
144 | tv = &static_tv_valid; | |
145 | #else | |
93f0b09a | 146 | tv = pthread_getspecific(tv_tls_key); |
67bf9823 | 147 | #endif |
93f0b09a | 148 | |
c223da83 | 149 | switch (fio_clock_source) { |
67bf9823 | 150 | #ifdef CONFIG_GETTIMEOFDAY |
c223da83 | 151 | case CS_GTOD: |
02bcaa8c | 152 | gettimeofday(tp, NULL); |
c223da83 | 153 | break; |
67bf9823 JA |
154 | #endif |
155 | #ifdef CONFIG_CLOCK_GETTIME | |
c223da83 | 156 | case CS_CGETTIME: { |
02bcaa8c JA |
157 | struct timespec ts; |
158 | ||
9ff1c070 | 159 | if (fill_clock_gettime(&ts) < 0) { |
c223da83 JA |
160 | log_err("fio: clock_gettime fails\n"); |
161 | assert(0); | |
02bcaa8c JA |
162 | } |
163 | ||
164 | tp->tv_sec = ts.tv_sec; | |
165 | tp->tv_usec = ts.tv_nsec / 1000; | |
c223da83 JA |
166 | break; |
167 | } | |
67bf9823 | 168 | #endif |
c223da83 JA |
169 | #ifdef ARCH_HAVE_CPU_CLOCK |
170 | case CS_CPUCLOCK: { | |
ba458c2f | 171 | uint64_t usecs, t; |
c223da83 JA |
172 | |
173 | t = get_cpu_clock(); | |
93f0b09a | 174 | if (tv && t < tv->last_cycles) { |
c223da83 | 175 | dprint(FD_TIME, "CPU clock going back in time\n"); |
93f0b09a JA |
176 | t = tv->last_cycles; |
177 | } else if (tv) | |
178 | tv->last_cycles = t; | |
c223da83 | 179 | |
71339117 | 180 | usecs = (t * inv_cycles_per_usec) / 16777216UL; |
c223da83 JA |
181 | tp->tv_sec = usecs / 1000000; |
182 | tp->tv_usec = usecs % 1000000; | |
c223da83 JA |
183 | break; |
184 | } | |
185 | #endif | |
186 | default: | |
187 | log_err("fio: invalid clock source %d\n", fio_clock_source); | |
188 | break; | |
02bcaa8c | 189 | } |
3e488920 | 190 | |
67bf9823 JA |
191 | return tv; |
192 | } | |
193 | ||
194 | #ifdef FIO_DEBUG_TIME | |
195 | void fio_gettime(struct timeval *tp, void *caller) | |
196 | #else | |
197 | void fio_gettime(struct timeval *tp, void fio_unused *caller) | |
198 | #endif | |
199 | { | |
200 | struct tv_valid *tv; | |
201 | ||
202 | #ifdef FIO_DEBUG_TIME | |
203 | if (!caller) | |
204 | caller = __builtin_return_address(0); | |
205 | ||
206 | gtod_log_caller(caller); | |
207 | #endif | |
208 | if (fio_tv) { | |
209 | memcpy(tp, fio_tv, sizeof(*tp)); | |
210 | return; | |
211 | } | |
212 | ||
213 | tv = __fio_gettime(tp); | |
214 | ||
3e488920 JA |
215 | /* |
216 | * If Linux is using the tsc clock on non-synced processors, | |
217 | * sometimes time can appear to drift backwards. Fix that up. | |
218 | */ | |
93f0b09a JA |
219 | if (tv) { |
220 | if (tv->last_tv_valid) { | |
221 | if (tp->tv_sec < tv->last_tv.tv_sec) | |
222 | tp->tv_sec = tv->last_tv.tv_sec; | |
223 | else if (tv->last_tv.tv_sec == tp->tv_sec && | |
224 | tp->tv_usec < tv->last_tv.tv_usec) | |
225 | tp->tv_usec = tv->last_tv.tv_usec; | |
5d879392 | 226 | } |
93f0b09a JA |
227 | tv->last_tv_valid = 1; |
228 | memcpy(&tv->last_tv, tp, sizeof(*tp)); | |
3e488920 | 229 | } |
02bcaa8c | 230 | } |
be4ecfdf | 231 | |
09a32402 | 232 | #ifdef ARCH_HAVE_CPU_CLOCK |
c223da83 JA |
233 | static unsigned long get_cycles_per_usec(void) |
234 | { | |
235 | struct timeval s, e; | |
ba458c2f | 236 | uint64_t c_s, c_e; |
67bf9823 | 237 | enum fio_cs old_cs = fio_clock_source; |
c223da83 | 238 | |
67bf9823 JA |
239 | #ifdef CONFIG_CLOCK_GETTIME |
240 | fio_clock_source = CS_CGETTIME; | |
241 | #else | |
242 | fio_clock_source = CS_GTOD; | |
243 | #endif | |
244 | __fio_gettime(&s); | |
9ff1c070 | 245 | |
c223da83 JA |
246 | c_s = get_cpu_clock(); |
247 | do { | |
ba458c2f | 248 | uint64_t elapsed; |
c223da83 | 249 | |
67bf9823 | 250 | __fio_gettime(&e); |
9ff1c070 | 251 | |
c223da83 | 252 | elapsed = utime_since(&s, &e); |
486332e5 | 253 | if (elapsed >= 1280) { |
c223da83 JA |
254 | c_e = get_cpu_clock(); |
255 | break; | |
256 | } | |
257 | } while (1); | |
258 | ||
67bf9823 | 259 | fio_clock_source = old_cs; |
c011000d | 260 | return (c_e - c_s + 127) >> 7; |
c223da83 JA |
261 | } |
262 | ||
fa80feae JA |
263 | #define NR_TIME_ITERS 50 |
264 | ||
09a32402 | 265 | static void calibrate_cpu_clock(void) |
c223da83 JA |
266 | { |
267 | double delta, mean, S; | |
ba458c2f | 268 | uint64_t avg, cycles[NR_TIME_ITERS]; |
c223da83 JA |
269 | int i, samples; |
270 | ||
c223da83 JA |
271 | cycles[0] = get_cycles_per_usec(); |
272 | S = delta = mean = 0.0; | |
fa80feae | 273 | for (i = 0; i < NR_TIME_ITERS; i++) { |
c223da83 JA |
274 | cycles[i] = get_cycles_per_usec(); |
275 | delta = cycles[i] - mean; | |
276 | if (delta) { | |
277 | mean += delta / (i + 1.0); | |
278 | S += delta * (cycles[i] - mean); | |
279 | } | |
280 | } | |
281 | ||
fa80feae | 282 | S = sqrt(S / (NR_TIME_ITERS - 1.0)); |
c223da83 JA |
283 | |
284 | samples = avg = 0; | |
fa80feae | 285 | for (i = 0; i < NR_TIME_ITERS; i++) { |
c223da83 JA |
286 | double this = cycles[i]; |
287 | ||
03e20d68 | 288 | if ((fmax(this, mean) - fmin(this, mean)) > S) |
c223da83 JA |
289 | continue; |
290 | samples++; | |
291 | avg += this; | |
292 | } | |
293 | ||
fa80feae | 294 | S /= (double) NR_TIME_ITERS; |
89db727d | 295 | mean /= 10.0; |
c223da83 | 296 | |
fa80feae | 297 | for (i = 0; i < NR_TIME_ITERS; i++) |
c223da83 JA |
298 | dprint(FD_TIME, "cycles[%d]=%lu\n", i, cycles[i] / 10); |
299 | ||
d7abad3d | 300 | avg /= samples; |
b0ff22d7 | 301 | avg = (avg + 5) / 10; |
c223da83 JA |
302 | dprint(FD_TIME, "avg: %lu\n", avg); |
303 | dprint(FD_TIME, "mean=%f, S=%f\n", mean, S); | |
304 | ||
305 | cycles_per_usec = avg; | |
71339117 JA |
306 | inv_cycles_per_usec = 16777216UL / cycles_per_usec; |
307 | dprint(FD_TIME, "inv_cycles_per_usec=%lu\n", inv_cycles_per_usec); | |
09a32402 JA |
308 | } |
309 | #else | |
310 | static void calibrate_cpu_clock(void) | |
311 | { | |
312 | } | |
313 | #endif | |
314 | ||
67bf9823 | 315 | #ifndef CONFIG_TLS_THREAD |
5d879392 JA |
316 | void fio_local_clock_init(int is_thread) |
317 | { | |
318 | struct tv_valid *t; | |
319 | ||
320 | t = calloc(sizeof(*t), 1); | |
321 | if (pthread_setspecific(tv_tls_key, t)) | |
322 | log_err("fio: can't set TLS key\n"); | |
323 | } | |
324 | ||
325 | static void kill_tv_tls_key(void *data) | |
326 | { | |
327 | free(data); | |
328 | } | |
67bf9823 JA |
329 | #else |
330 | void fio_local_clock_init(int is_thread) | |
331 | { | |
332 | } | |
333 | #endif | |
5d879392 | 334 | |
09a32402 JA |
335 | void fio_clock_init(void) |
336 | { | |
01423eae JA |
337 | if (fio_clock_source == fio_clock_source_inited) |
338 | return; | |
339 | ||
67bf9823 | 340 | #ifndef CONFIG_TLS_THREAD |
5d879392 JA |
341 | if (pthread_key_create(&tv_tls_key, kill_tv_tls_key)) |
342 | log_err("fio: can't create TLS key\n"); | |
67bf9823 | 343 | #endif |
5d879392 | 344 | |
01423eae | 345 | fio_clock_source_inited = fio_clock_source; |
09a32402 | 346 | calibrate_cpu_clock(); |
fa80feae JA |
347 | |
348 | /* | |
349 | * If the arch sets tsc_reliable != 0, then it must be good enough | |
350 | * to use as THE clock source. For x86 CPUs, this means the TSC | |
351 | * runs at a constant rate and is synced across CPU cores. | |
352 | */ | |
353 | if (tsc_reliable) { | |
354 | if (!fio_clock_source_set) | |
355 | fio_clock_source = CS_CPUCLOCK; | |
356 | } else if (fio_clock_source == CS_CPUCLOCK) | |
357 | log_info("fio: clocksource=cpu may not be reliable\n"); | |
c223da83 JA |
358 | } |
359 | ||
aa60bc58 | 360 | uint64_t utime_since(struct timeval *s, struct timeval *e) |
be4ecfdf | 361 | { |
39ab7da2 | 362 | long sec, usec; |
aa60bc58 | 363 | uint64_t ret; |
39ab7da2 JA |
364 | |
365 | sec = e->tv_sec - s->tv_sec; | |
366 | usec = e->tv_usec - s->tv_usec; | |
367 | if (sec > 0 && usec < 0) { | |
368 | sec--; | |
369 | usec += 1000000; | |
370 | } | |
371 | ||
372 | /* | |
373 | * time warp bug on some kernels? | |
374 | */ | |
375 | if (sec < 0 || (sec == 0 && usec < 0)) | |
376 | return 0; | |
377 | ||
378 | ret = sec * 1000000ULL + usec; | |
379 | ||
380 | return ret; | |
be4ecfdf JA |
381 | } |
382 | ||
aa60bc58 | 383 | uint64_t utime_since_now(struct timeval *s) |
be4ecfdf | 384 | { |
39ab7da2 JA |
385 | struct timeval t; |
386 | ||
387 | fio_gettime(&t, NULL); | |
388 | return utime_since(s, &t); | |
be4ecfdf | 389 | } |
783a3eb1 | 390 | |
aa60bc58 | 391 | uint64_t mtime_since(struct timeval *s, struct timeval *e) |
783a3eb1 | 392 | { |
39ab7da2 | 393 | long sec, usec, ret; |
783a3eb1 | 394 | |
39ab7da2 JA |
395 | sec = e->tv_sec - s->tv_sec; |
396 | usec = e->tv_usec - s->tv_usec; | |
397 | if (sec > 0 && usec < 0) { | |
398 | sec--; | |
399 | usec += 1000000; | |
783a3eb1 JA |
400 | } |
401 | ||
39ab7da2 JA |
402 | if (sec < 0 || (sec == 0 && usec < 0)) |
403 | return 0; | |
404 | ||
405 | sec *= 1000UL; | |
406 | usec /= 1000UL; | |
407 | ret = sec + usec; | |
408 | ||
409 | return ret; | |
783a3eb1 JA |
410 | } |
411 | ||
aa60bc58 | 412 | uint64_t mtime_since_now(struct timeval *s) |
783a3eb1 | 413 | { |
39ab7da2 JA |
414 | struct timeval t; |
415 | void *p = __builtin_return_address(0); | |
783a3eb1 | 416 | |
39ab7da2 JA |
417 | fio_gettime(&t, p); |
418 | return mtime_since(s, &t); | |
419 | } | |
783a3eb1 | 420 | |
aa60bc58 | 421 | uint64_t time_since_now(struct timeval *s) |
39ab7da2 JA |
422 | { |
423 | return mtime_since_now(s) / 1000; | |
783a3eb1 | 424 | } |
7d11f871 | 425 | |
67bf9823 JA |
426 | #if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) && \ |
427 | defined(CONFIG_SFAA) | |
7d11f871 JA |
428 | |
429 | #define CLOCK_ENTRIES 100000 | |
430 | ||
431 | struct clock_entry { | |
ba458c2f JA |
432 | uint64_t seq; |
433 | uint64_t tsc; | |
434 | uint64_t cpu; | |
7d11f871 JA |
435 | }; |
436 | ||
437 | struct clock_thread { | |
438 | pthread_t thread; | |
439 | int cpu; | |
440 | pthread_mutex_t lock; | |
441 | pthread_mutex_t started; | |
442 | uint64_t *seq; | |
443 | struct clock_entry *entries; | |
444 | }; | |
445 | ||
446 | static inline uint64_t atomic64_inc_return(uint64_t *seq) | |
447 | { | |
448 | return 1 + __sync_fetch_and_add(seq, 1); | |
449 | } | |
450 | ||
451 | static void *clock_thread_fn(void *data) | |
452 | { | |
453 | struct clock_thread *t = data; | |
454 | struct clock_entry *c; | |
455 | os_cpu_mask_t cpu_mask; | |
456 | int i; | |
457 | ||
458 | memset(&cpu_mask, 0, sizeof(cpu_mask)); | |
459 | fio_cpu_set(&cpu_mask, t->cpu); | |
460 | ||
461 | if (fio_setaffinity(gettid(), cpu_mask) == -1) { | |
462 | log_err("clock setaffinity failed\n"); | |
463 | return (void *) 1; | |
464 | } | |
465 | ||
7d11f871 | 466 | pthread_mutex_lock(&t->lock); |
b9b3498e | 467 | pthread_mutex_unlock(&t->started); |
7d11f871 JA |
468 | |
469 | c = &t->entries[0]; | |
470 | for (i = 0; i < CLOCK_ENTRIES; i++, c++) { | |
471 | uint64_t seq, tsc; | |
472 | ||
473 | c->cpu = t->cpu; | |
474 | do { | |
475 | seq = atomic64_inc_return(t->seq); | |
476 | tsc = get_cpu_clock(); | |
477 | } while (seq != *t->seq); | |
478 | ||
479 | c->seq = seq; | |
480 | c->tsc = tsc; | |
481 | } | |
482 | ||
483 | log_info("cs: cpu%3d: %lu clocks seen\n", t->cpu, t->entries[CLOCK_ENTRIES - 1].tsc - t->entries[0].tsc); | |
484 | return NULL; | |
485 | } | |
486 | ||
487 | static int clock_cmp(const void *p1, const void *p2) | |
488 | { | |
489 | const struct clock_entry *c1 = p1; | |
490 | const struct clock_entry *c2 = p2; | |
491 | ||
b9b3498e JA |
492 | if (c1->seq == c2->seq) |
493 | log_err("cs: bug in atomic sequence!\n"); | |
494 | ||
7d11f871 JA |
495 | return c1->seq - c2->seq; |
496 | } | |
497 | ||
498 | int fio_monotonic_clocktest(void) | |
499 | { | |
500 | struct clock_thread *threads; | |
501 | unsigned int nr_cpus = cpus_online(); | |
502 | struct clock_entry *entries; | |
503 | unsigned long tentries, failed; | |
504 | uint64_t seq = 0; | |
505 | int i; | |
506 | ||
d5e3f5d8 JA |
507 | log_info("cs: reliable_tsc: %s\n", tsc_reliable ? "yes" : "no"); |
508 | ||
4f1d43c2 JA |
509 | fio_debug |= 1U << FD_TIME; |
510 | calibrate_cpu_clock(); | |
511 | fio_debug &= ~(1U << FD_TIME); | |
512 | ||
7d11f871 JA |
513 | threads = malloc(nr_cpus * sizeof(struct clock_thread)); |
514 | tentries = CLOCK_ENTRIES * nr_cpus; | |
515 | entries = malloc(tentries * sizeof(struct clock_entry)); | |
516 | ||
517 | log_info("cs: Testing %u CPUs\n", nr_cpus); | |
518 | ||
519 | for (i = 0; i < nr_cpus; i++) { | |
520 | struct clock_thread *t = &threads[i]; | |
521 | ||
522 | t->cpu = i; | |
523 | t->seq = &seq; | |
524 | t->entries = &entries[i * CLOCK_ENTRIES]; | |
525 | pthread_mutex_init(&t->lock, NULL); | |
526 | pthread_mutex_init(&t->started, NULL); | |
527 | pthread_mutex_lock(&t->lock); | |
528 | pthread_create(&t->thread, NULL, clock_thread_fn, t); | |
529 | } | |
530 | ||
531 | for (i = 0; i < nr_cpus; i++) { | |
532 | struct clock_thread *t = &threads[i]; | |
533 | ||
534 | pthread_mutex_lock(&t->started); | |
535 | } | |
536 | ||
537 | for (i = 0; i < nr_cpus; i++) { | |
538 | struct clock_thread *t = &threads[i]; | |
539 | ||
540 | pthread_mutex_unlock(&t->lock); | |
541 | } | |
542 | ||
543 | for (failed = i = 0; i < nr_cpus; i++) { | |
544 | struct clock_thread *t = &threads[i]; | |
545 | void *ret; | |
546 | ||
547 | pthread_join(t->thread, &ret); | |
548 | if (ret) | |
549 | failed++; | |
550 | } | |
551 | free(threads); | |
552 | ||
553 | if (failed) { | |
554 | log_err("Clocksource test: %u threads failed\n", failed); | |
555 | goto err; | |
556 | } | |
557 | ||
558 | qsort(entries, tentries, sizeof(struct clock_entry), clock_cmp); | |
559 | ||
560 | for (failed = i = 0; i < tentries; i++) { | |
561 | struct clock_entry *prev, *this = &entries[i]; | |
562 | ||
563 | if (!i) { | |
564 | prev = this; | |
565 | continue; | |
566 | } | |
567 | ||
568 | if (prev->tsc > this->tsc) { | |
569 | uint64_t diff = prev->tsc - this->tsc; | |
570 | ||
571 | log_info("cs: CPU clock mismatch (diff=%lu):\n", diff); | |
572 | log_info("\t CPU%3lu: TSC=%lu, SEQ=%lu\n", prev->cpu, prev->tsc, prev->seq); | |
573 | log_info("\t CPU%3lu: TSC=%lu, SEQ=%lu\n", this->cpu, this->tsc, this->seq); | |
574 | failed++; | |
575 | } | |
576 | ||
577 | prev = this; | |
578 | } | |
579 | ||
580 | if (failed) | |
581 | log_info("cs: Failed: %lu\n", failed); | |
582 | else | |
583 | log_info("cs: Pass!\n"); | |
584 | ||
585 | err: | |
586 | free(entries); | |
587 | return !!failed; | |
588 | } | |
589 | ||
590 | #else /* defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) */ | |
591 | ||
592 | int fio_monotonic_clocktest(void) | |
593 | { | |
594 | log_info("cs: current platform does not support CPU clocks\n"); | |
595 | return 0; | |
596 | } | |
597 | ||
598 | #endif |