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 | |
dac499a0 AV |
16 | #if defined(ARCH_HAVE_CPU_CLOCK) |
17 | #ifndef ARCH_CPU_CLOCK_CYCLES_PER_USEC | |
c223da83 | 18 | static unsigned long cycles_per_usec; |
71339117 | 19 | static unsigned long inv_cycles_per_usec; |
b3fa625b | 20 | static uint64_t max_cycles_for_mult; |
96170421 CE |
21 | #endif |
22 | #ifdef ARCH_CPU_CLOCK_WRAPS | |
73df3e07 | 23 | static unsigned long long cycles_start, cycles_wrap; |
09a32402 | 24 | #endif |
dac499a0 | 25 | #endif |
4de98eb0 | 26 | int tsc_reliable = 0; |
5d879392 JA |
27 | |
28 | struct tv_valid { | |
ba458c2f | 29 | uint64_t last_cycles; |
02dcf81c JA |
30 | int last_tv_valid; |
31 | int warned; | |
5d879392 | 32 | }; |
03be65c9 | 33 | #ifdef ARCH_HAVE_CPU_CLOCK |
67bf9823 | 34 | #ifdef CONFIG_TLS_THREAD |
b4ea84da | 35 | static __thread struct tv_valid static_tv_valid; |
67bf9823 | 36 | #else |
5d879392 | 37 | static pthread_key_t tv_tls_key; |
67bf9823 | 38 | #endif |
03be65c9 | 39 | #endif |
02bcaa8c | 40 | |
16de1bf9 | 41 | enum fio_cs fio_clock_source = FIO_PREFERRED_CLOCK_SOURCE; |
fa80feae | 42 | int fio_clock_source_set = 0; |
10aa136b | 43 | static enum fio_cs fio_clock_source_inited = CS_INVAL; |
c223da83 | 44 | |
02bcaa8c JA |
45 | #ifdef FIO_DEBUG_TIME |
46 | ||
47 | #define HASH_BITS 8 | |
48 | #define HASH_SIZE (1 << HASH_BITS) | |
49 | ||
01743ee1 | 50 | static struct flist_head hash[HASH_SIZE]; |
02bcaa8c JA |
51 | static int gtod_inited; |
52 | ||
53 | struct gtod_log { | |
01743ee1 | 54 | struct flist_head list; |
02bcaa8c JA |
55 | void *caller; |
56 | unsigned long calls; | |
57 | }; | |
58 | ||
59 | static struct gtod_log *find_hash(void *caller) | |
60 | { | |
61 | unsigned long h = hash_ptr(caller, HASH_BITS); | |
01743ee1 | 62 | struct flist_head *entry; |
02bcaa8c | 63 | |
01743ee1 JA |
64 | flist_for_each(entry, &hash[h]) { |
65 | struct gtod_log *log = flist_entry(entry, struct gtod_log, | |
66 | list); | |
02bcaa8c JA |
67 | |
68 | if (log->caller == caller) | |
69 | return log; | |
70 | } | |
71 | ||
72 | return NULL; | |
73 | } | |
74 | ||
d5e16441 | 75 | static void inc_caller(void *caller) |
02bcaa8c JA |
76 | { |
77 | struct gtod_log *log = find_hash(caller); | |
78 | ||
79 | if (!log) { | |
80 | unsigned long h; | |
81 | ||
82 | log = malloc(sizeof(*log)); | |
01743ee1 | 83 | INIT_FLIST_HEAD(&log->list); |
02bcaa8c JA |
84 | log->caller = caller; |
85 | log->calls = 0; | |
86 | ||
87 | h = hash_ptr(caller, HASH_BITS); | |
01743ee1 | 88 | flist_add_tail(&log->list, &hash[h]); |
02bcaa8c JA |
89 | } |
90 | ||
d5e16441 | 91 | log->calls++; |
02bcaa8c JA |
92 | } |
93 | ||
94 | static void gtod_log_caller(void *caller) | |
95 | { | |
d5e16441 JA |
96 | if (gtod_inited) |
97 | inc_caller(caller); | |
02bcaa8c JA |
98 | } |
99 | ||
100 | static void fio_exit fio_dump_gtod(void) | |
101 | { | |
102 | unsigned long total_calls = 0; | |
103 | int i; | |
104 | ||
105 | for (i = 0; i < HASH_SIZE; i++) { | |
01743ee1 | 106 | struct flist_head *entry; |
02bcaa8c JA |
107 | struct gtod_log *log; |
108 | ||
01743ee1 JA |
109 | flist_for_each(entry, &hash[i]) { |
110 | log = flist_entry(entry, struct gtod_log, list); | |
02bcaa8c | 111 | |
5ec10eaa JA |
112 | printf("function %p, calls %lu\n", log->caller, |
113 | log->calls); | |
02bcaa8c JA |
114 | total_calls += log->calls; |
115 | } | |
116 | } | |
117 | ||
118 | printf("Total %lu gettimeofday\n", total_calls); | |
119 | } | |
120 | ||
121 | static void fio_init gtod_init(void) | |
122 | { | |
123 | int i; | |
124 | ||
125 | for (i = 0; i < HASH_SIZE; i++) | |
01743ee1 | 126 | INIT_FLIST_HEAD(&hash[i]); |
02bcaa8c JA |
127 | |
128 | gtod_inited = 1; | |
129 | } | |
130 | ||
131 | #endif /* FIO_DEBUG_TIME */ | |
132 | ||
67bf9823 | 133 | #ifdef CONFIG_CLOCK_GETTIME |
9ff1c070 JA |
134 | static int fill_clock_gettime(struct timespec *ts) |
135 | { | |
67bf9823 | 136 | #ifdef CONFIG_CLOCK_MONOTONIC |
9ff1c070 JA |
137 | return clock_gettime(CLOCK_MONOTONIC, ts); |
138 | #else | |
139 | return clock_gettime(CLOCK_REALTIME, ts); | |
140 | #endif | |
141 | } | |
1e97cce9 | 142 | #endif |
67bf9823 | 143 | |
9eb271b9 | 144 | static void __fio_gettime(struct timeval *tp) |
02bcaa8c | 145 | { |
c223da83 | 146 | switch (fio_clock_source) { |
67bf9823 | 147 | #ifdef CONFIG_GETTIMEOFDAY |
c223da83 | 148 | case CS_GTOD: |
02bcaa8c | 149 | gettimeofday(tp, NULL); |
c223da83 | 150 | break; |
67bf9823 JA |
151 | #endif |
152 | #ifdef CONFIG_CLOCK_GETTIME | |
c223da83 | 153 | case CS_CGETTIME: { |
02bcaa8c JA |
154 | struct timespec ts; |
155 | ||
9ff1c070 | 156 | if (fill_clock_gettime(&ts) < 0) { |
c223da83 JA |
157 | log_err("fio: clock_gettime fails\n"); |
158 | assert(0); | |
02bcaa8c JA |
159 | } |
160 | ||
161 | tp->tv_sec = ts.tv_sec; | |
162 | tp->tv_usec = ts.tv_nsec / 1000; | |
c223da83 JA |
163 | break; |
164 | } | |
67bf9823 | 165 | #endif |
c223da83 JA |
166 | #ifdef ARCH_HAVE_CPU_CLOCK |
167 | case CS_CPUCLOCK: { | |
ba458c2f | 168 | uint64_t usecs, t; |
03be65c9 JA |
169 | struct tv_valid *tv; |
170 | ||
171 | #ifdef CONFIG_TLS_THREAD | |
172 | tv = &static_tv_valid; | |
173 | #else | |
174 | tv = pthread_getspecific(tv_tls_key); | |
175 | #endif | |
c223da83 JA |
176 | |
177 | t = get_cpu_clock(); | |
96170421 | 178 | #ifdef ARCH_CPU_CLOCK_WRAPS |
73df3e07 JA |
179 | if (t < cycles_start && !cycles_wrap) |
180 | cycles_wrap = 1; | |
03be65c9 JA |
181 | else if (cycles_wrap && t >= cycles_start && !tv->warned) { |
182 | log_err("fio: double CPU clock wrap\n"); | |
183 | tv->warned = 1; | |
02dcf81c | 184 | } |
c223da83 | 185 | |
73df3e07 | 186 | t -= cycles_start; |
96170421 | 187 | #endif |
9eb271b9 JA |
188 | tv->last_cycles = t; |
189 | tv->last_tv_valid = 1; | |
919e789d CE |
190 | #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
191 | usecs = t / ARCH_CPU_CLOCK_CYCLES_PER_USEC; | |
192 | #else | |
b3fa625b JA |
193 | if (t < max_cycles_for_mult) |
194 | usecs = (t * inv_cycles_per_usec) / 16777216UL; | |
195 | else | |
196 | usecs = t / cycles_per_usec; | |
919e789d | 197 | #endif |
c223da83 JA |
198 | tp->tv_sec = usecs / 1000000; |
199 | tp->tv_usec = usecs % 1000000; | |
c223da83 JA |
200 | break; |
201 | } | |
202 | #endif | |
203 | default: | |
204 | log_err("fio: invalid clock source %d\n", fio_clock_source); | |
205 | break; | |
02bcaa8c | 206 | } |
67bf9823 JA |
207 | } |
208 | ||
209 | #ifdef FIO_DEBUG_TIME | |
210 | void fio_gettime(struct timeval *tp, void *caller) | |
211 | #else | |
212 | void fio_gettime(struct timeval *tp, void fio_unused *caller) | |
213 | #endif | |
214 | { | |
67bf9823 JA |
215 | #ifdef FIO_DEBUG_TIME |
216 | if (!caller) | |
217 | caller = __builtin_return_address(0); | |
218 | ||
219 | gtod_log_caller(caller); | |
220 | #endif | |
27325ed5 | 221 | if (fio_unlikely(fio_gettime_offload(tp))) |
67bf9823 | 222 | return; |
67bf9823 | 223 | |
9eb271b9 | 224 | __fio_gettime(tp); |
02bcaa8c | 225 | } |
be4ecfdf | 226 | |
919e789d | 227 | #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(ARCH_CPU_CLOCK_CYCLES_PER_USEC) |
c223da83 JA |
228 | static unsigned long get_cycles_per_usec(void) |
229 | { | |
230 | struct timeval s, e; | |
ba458c2f | 231 | uint64_t c_s, c_e; |
67bf9823 | 232 | enum fio_cs old_cs = fio_clock_source; |
c223da83 | 233 | |
67bf9823 JA |
234 | #ifdef CONFIG_CLOCK_GETTIME |
235 | fio_clock_source = CS_CGETTIME; | |
236 | #else | |
237 | fio_clock_source = CS_GTOD; | |
238 | #endif | |
239 | __fio_gettime(&s); | |
9ff1c070 | 240 | |
c223da83 JA |
241 | c_s = get_cpu_clock(); |
242 | do { | |
ba458c2f | 243 | uint64_t elapsed; |
c223da83 | 244 | |
67bf9823 | 245 | __fio_gettime(&e); |
9ff1c070 | 246 | |
c223da83 | 247 | elapsed = utime_since(&s, &e); |
486332e5 | 248 | if (elapsed >= 1280) { |
c223da83 JA |
249 | c_e = get_cpu_clock(); |
250 | break; | |
251 | } | |
252 | } while (1); | |
253 | ||
67bf9823 | 254 | fio_clock_source = old_cs; |
c011000d | 255 | return (c_e - c_s + 127) >> 7; |
c223da83 JA |
256 | } |
257 | ||
fa80feae JA |
258 | #define NR_TIME_ITERS 50 |
259 | ||
e259879e | 260 | static int calibrate_cpu_clock(void) |
c223da83 JA |
261 | { |
262 | double delta, mean, S; | |
e51a6629 | 263 | uint64_t minc, maxc, avg, cycles[NR_TIME_ITERS]; |
c223da83 JA |
264 | int i, samples; |
265 | ||
c223da83 JA |
266 | cycles[0] = get_cycles_per_usec(); |
267 | S = delta = mean = 0.0; | |
fa80feae | 268 | for (i = 0; i < NR_TIME_ITERS; i++) { |
c223da83 JA |
269 | cycles[i] = get_cycles_per_usec(); |
270 | delta = cycles[i] - mean; | |
271 | if (delta) { | |
272 | mean += delta / (i + 1.0); | |
273 | S += delta * (cycles[i] - mean); | |
274 | } | |
275 | } | |
276 | ||
e259879e JA |
277 | /* |
278 | * The most common platform clock breakage is returning zero | |
279 | * indefinitely. Check for that and return failure. | |
280 | */ | |
281 | if (!cycles[0] && !cycles[NR_TIME_ITERS - 1]) | |
282 | return 1; | |
283 | ||
fa80feae | 284 | S = sqrt(S / (NR_TIME_ITERS - 1.0)); |
c223da83 | 285 | |
e51a6629 JA |
286 | minc = -1ULL; |
287 | maxc = samples = avg = 0; | |
fa80feae | 288 | for (i = 0; i < NR_TIME_ITERS; i++) { |
c223da83 JA |
289 | double this = cycles[i]; |
290 | ||
e51a6629 JA |
291 | minc = min(cycles[i], minc); |
292 | maxc = max(cycles[i], maxc); | |
293 | ||
03e20d68 | 294 | if ((fmax(this, mean) - fmin(this, mean)) > S) |
c223da83 JA |
295 | continue; |
296 | samples++; | |
297 | avg += this; | |
298 | } | |
299 | ||
fa80feae | 300 | S /= (double) NR_TIME_ITERS; |
89db727d | 301 | mean /= 10.0; |
c223da83 | 302 | |
fa80feae | 303 | for (i = 0; i < NR_TIME_ITERS; i++) |
4b91ee8f JA |
304 | dprint(FD_TIME, "cycles[%d]=%llu\n", i, |
305 | (unsigned long long) cycles[i] / 10); | |
c223da83 | 306 | |
d7abad3d | 307 | avg /= samples; |
b0ff22d7 | 308 | avg = (avg + 5) / 10; |
e51a6629 JA |
309 | minc /= 10; |
310 | maxc /= 10; | |
4b91ee8f | 311 | dprint(FD_TIME, "avg: %llu\n", (unsigned long long) avg); |
e51a6629 JA |
312 | dprint(FD_TIME, "min=%llu, max=%llu, mean=%f, S=%f\n", |
313 | (unsigned long long) minc, | |
314 | (unsigned long long) maxc, mean, S); | |
c223da83 JA |
315 | |
316 | cycles_per_usec = avg; | |
71339117 | 317 | inv_cycles_per_usec = 16777216UL / cycles_per_usec; |
b3fa625b | 318 | max_cycles_for_mult = ~0ULL / inv_cycles_per_usec; |
71339117 | 319 | dprint(FD_TIME, "inv_cycles_per_usec=%lu\n", inv_cycles_per_usec); |
96170421 | 320 | #ifdef ARCH_CPU_CLOCK_WRAPS |
73df3e07 JA |
321 | cycles_start = get_cpu_clock(); |
322 | dprint(FD_TIME, "cycles_start=%llu\n", cycles_start); | |
96170421 | 323 | #endif |
e259879e | 324 | return 0; |
09a32402 JA |
325 | } |
326 | #else | |
e259879e | 327 | static int calibrate_cpu_clock(void) |
09a32402 | 328 | { |
919e789d CE |
329 | #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
330 | return 0; | |
331 | #else | |
e259879e | 332 | return 1; |
09a32402 | 333 | #endif |
919e789d CE |
334 | } |
335 | #endif // ARCH_HAVE_CPU_CLOCK | |
09a32402 | 336 | |
67bf9823 | 337 | #ifndef CONFIG_TLS_THREAD |
5d879392 JA |
338 | void fio_local_clock_init(int is_thread) |
339 | { | |
340 | struct tv_valid *t; | |
341 | ||
572cfb3f | 342 | t = calloc(1, sizeof(*t)); |
9eb271b9 | 343 | if (pthread_setspecific(tv_tls_key, t)) { |
5d879392 | 344 | log_err("fio: can't set TLS key\n"); |
9eb271b9 JA |
345 | assert(0); |
346 | } | |
5d879392 JA |
347 | } |
348 | ||
349 | static void kill_tv_tls_key(void *data) | |
350 | { | |
351 | free(data); | |
352 | } | |
67bf9823 JA |
353 | #else |
354 | void fio_local_clock_init(int is_thread) | |
355 | { | |
356 | } | |
357 | #endif | |
5d879392 | 358 | |
09a32402 JA |
359 | void fio_clock_init(void) |
360 | { | |
01423eae JA |
361 | if (fio_clock_source == fio_clock_source_inited) |
362 | return; | |
363 | ||
67bf9823 | 364 | #ifndef CONFIG_TLS_THREAD |
5d879392 JA |
365 | if (pthread_key_create(&tv_tls_key, kill_tv_tls_key)) |
366 | log_err("fio: can't create TLS key\n"); | |
67bf9823 | 367 | #endif |
5d879392 | 368 | |
01423eae | 369 | fio_clock_source_inited = fio_clock_source; |
e259879e JA |
370 | |
371 | if (calibrate_cpu_clock()) | |
372 | tsc_reliable = 0; | |
fa80feae JA |
373 | |
374 | /* | |
375 | * If the arch sets tsc_reliable != 0, then it must be good enough | |
376 | * to use as THE clock source. For x86 CPUs, this means the TSC | |
377 | * runs at a constant rate and is synced across CPU cores. | |
378 | */ | |
379 | if (tsc_reliable) { | |
aad918e4 | 380 | if (!fio_clock_source_set && !fio_monotonic_clocktest(0)) |
fa80feae JA |
381 | fio_clock_source = CS_CPUCLOCK; |
382 | } else if (fio_clock_source == CS_CPUCLOCK) | |
383 | log_info("fio: clocksource=cpu may not be reliable\n"); | |
c223da83 JA |
384 | } |
385 | ||
1f440ece | 386 | uint64_t utime_since(const struct timeval *s, const struct timeval *e) |
be4ecfdf | 387 | { |
39ab7da2 | 388 | long sec, usec; |
aa60bc58 | 389 | uint64_t ret; |
39ab7da2 JA |
390 | |
391 | sec = e->tv_sec - s->tv_sec; | |
392 | usec = e->tv_usec - s->tv_usec; | |
393 | if (sec > 0 && usec < 0) { | |
394 | sec--; | |
395 | usec += 1000000; | |
396 | } | |
397 | ||
398 | /* | |
399 | * time warp bug on some kernels? | |
400 | */ | |
401 | if (sec < 0 || (sec == 0 && usec < 0)) | |
402 | return 0; | |
403 | ||
404 | ret = sec * 1000000ULL + usec; | |
405 | ||
406 | return ret; | |
be4ecfdf JA |
407 | } |
408 | ||
1f440ece | 409 | uint64_t utime_since_now(const struct timeval *s) |
be4ecfdf | 410 | { |
39ab7da2 JA |
411 | struct timeval t; |
412 | ||
413 | fio_gettime(&t, NULL); | |
414 | return utime_since(s, &t); | |
be4ecfdf | 415 | } |
783a3eb1 | 416 | |
1f440ece | 417 | uint64_t mtime_since(const struct timeval *s, const struct timeval *e) |
783a3eb1 | 418 | { |
39ab7da2 | 419 | long sec, usec, ret; |
783a3eb1 | 420 | |
39ab7da2 JA |
421 | sec = e->tv_sec - s->tv_sec; |
422 | usec = e->tv_usec - s->tv_usec; | |
423 | if (sec > 0 && usec < 0) { | |
424 | sec--; | |
425 | usec += 1000000; | |
783a3eb1 JA |
426 | } |
427 | ||
39ab7da2 JA |
428 | if (sec < 0 || (sec == 0 && usec < 0)) |
429 | return 0; | |
430 | ||
431 | sec *= 1000UL; | |
432 | usec /= 1000UL; | |
433 | ret = sec + usec; | |
434 | ||
435 | return ret; | |
783a3eb1 JA |
436 | } |
437 | ||
1f440ece | 438 | uint64_t mtime_since_now(const struct timeval *s) |
783a3eb1 | 439 | { |
39ab7da2 JA |
440 | struct timeval t; |
441 | void *p = __builtin_return_address(0); | |
783a3eb1 | 442 | |
39ab7da2 JA |
443 | fio_gettime(&t, p); |
444 | return mtime_since(s, &t); | |
445 | } | |
783a3eb1 | 446 | |
1f440ece | 447 | uint64_t time_since_now(const struct timeval *s) |
39ab7da2 JA |
448 | { |
449 | return mtime_since_now(s) / 1000; | |
783a3eb1 | 450 | } |
7d11f871 | 451 | |
67bf9823 JA |
452 | #if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) && \ |
453 | defined(CONFIG_SFAA) | |
7d11f871 | 454 | |
aad918e4 JA |
455 | #define CLOCK_ENTRIES_DEBUG 100000 |
456 | #define CLOCK_ENTRIES_TEST 10000 | |
7d11f871 JA |
457 | |
458 | struct clock_entry { | |
58002f9a JA |
459 | uint32_t seq; |
460 | uint32_t cpu; | |
ba458c2f | 461 | uint64_t tsc; |
7d11f871 JA |
462 | }; |
463 | ||
464 | struct clock_thread { | |
465 | pthread_t thread; | |
466 | int cpu; | |
aad918e4 | 467 | int debug; |
7d11f871 JA |
468 | pthread_mutex_t lock; |
469 | pthread_mutex_t started; | |
aad918e4 | 470 | unsigned long nr_entries; |
58002f9a | 471 | uint32_t *seq; |
7d11f871 JA |
472 | struct clock_entry *entries; |
473 | }; | |
474 | ||
58002f9a | 475 | static inline uint32_t atomic32_inc_return(uint32_t *seq) |
7d11f871 JA |
476 | { |
477 | return 1 + __sync_fetch_and_add(seq, 1); | |
478 | } | |
479 | ||
480 | static void *clock_thread_fn(void *data) | |
481 | { | |
482 | struct clock_thread *t = data; | |
483 | struct clock_entry *c; | |
484 | os_cpu_mask_t cpu_mask; | |
58002f9a | 485 | uint32_t last_seq; |
7d11f871 JA |
486 | int i; |
487 | ||
c763aea6 | 488 | if (fio_cpuset_init(&cpu_mask)) { |
37e20021 | 489 | int __err = errno; |
c763aea6 JA |
490 | |
491 | log_err("clock cpuset init failed: %s\n", strerror(__err)); | |
492 | goto err_out; | |
493 | } | |
494 | ||
7d11f871 JA |
495 | fio_cpu_set(&cpu_mask, t->cpu); |
496 | ||
497 | if (fio_setaffinity(gettid(), cpu_mask) == -1) { | |
e66d7f90 JA |
498 | int __err = errno; |
499 | ||
500 | log_err("clock setaffinity failed: %s\n", strerror(__err)); | |
c763aea6 | 501 | goto err; |
7d11f871 JA |
502 | } |
503 | ||
7d11f871 | 504 | pthread_mutex_lock(&t->lock); |
b9b3498e | 505 | pthread_mutex_unlock(&t->started); |
7d11f871 | 506 | |
58002f9a | 507 | last_seq = 0; |
7d11f871 | 508 | c = &t->entries[0]; |
aad918e4 | 509 | for (i = 0; i < t->nr_entries; i++, c++) { |
58002f9a JA |
510 | uint32_t seq; |
511 | uint64_t tsc; | |
7d11f871 JA |
512 | |
513 | c->cpu = t->cpu; | |
514 | do { | |
58002f9a JA |
515 | seq = atomic32_inc_return(t->seq); |
516 | if (seq < last_seq) | |
517 | break; | |
7d11f871 JA |
518 | tsc = get_cpu_clock(); |
519 | } while (seq != *t->seq); | |
520 | ||
521 | c->seq = seq; | |
522 | c->tsc = tsc; | |
523 | } | |
524 | ||
aad918e4 JA |
525 | if (t->debug) { |
526 | unsigned long long clocks; | |
527 | ||
528 | clocks = t->entries[i - 1].tsc - t->entries[0].tsc; | |
529 | log_info("cs: cpu%3d: %llu clocks seen\n", t->cpu, clocks); | |
530 | } | |
58002f9a | 531 | |
e259879e JA |
532 | /* |
533 | * The most common platform clock breakage is returning zero | |
534 | * indefinitely. Check for that and return failure. | |
535 | */ | |
58002f9a | 536 | if (!t->entries[i - 1].tsc && !t->entries[0].tsc) |
c763aea6 | 537 | goto err; |
e259879e | 538 | |
d47d7cb3 | 539 | fio_cpuset_exit(&cpu_mask); |
7d11f871 | 540 | return NULL; |
c763aea6 JA |
541 | err: |
542 | fio_cpuset_exit(&cpu_mask); | |
543 | err_out: | |
544 | return (void *) 1; | |
7d11f871 JA |
545 | } |
546 | ||
547 | static int clock_cmp(const void *p1, const void *p2) | |
548 | { | |
549 | const struct clock_entry *c1 = p1; | |
550 | const struct clock_entry *c2 = p2; | |
551 | ||
b9b3498e JA |
552 | if (c1->seq == c2->seq) |
553 | log_err("cs: bug in atomic sequence!\n"); | |
554 | ||
7d11f871 JA |
555 | return c1->seq - c2->seq; |
556 | } | |
557 | ||
aad918e4 | 558 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 559 | { |
8a1db9a1 | 560 | struct clock_thread *cthreads; |
7d11f871 JA |
561 | unsigned int nr_cpus = cpus_online(); |
562 | struct clock_entry *entries; | |
aad918e4 | 563 | unsigned long nr_entries, tentries, failed = 0; |
80da8a8f | 564 | struct clock_entry *prev, *this; |
58002f9a | 565 | uint32_t seq = 0; |
caa3eb1c | 566 | unsigned int i; |
7d11f871 | 567 | |
aad918e4 JA |
568 | if (debug) { |
569 | log_info("cs: reliable_tsc: %s\n", tsc_reliable ? "yes" : "no"); | |
d5e3f5d8 | 570 | |
b5b571a3 | 571 | #ifdef FIO_INC_DEBUG |
aad918e4 | 572 | fio_debug |= 1U << FD_TIME; |
b5b571a3 | 573 | #endif |
aad918e4 JA |
574 | nr_entries = CLOCK_ENTRIES_DEBUG; |
575 | } else | |
576 | nr_entries = CLOCK_ENTRIES_TEST; | |
577 | ||
4f1d43c2 | 578 | calibrate_cpu_clock(); |
aad918e4 JA |
579 | |
580 | if (debug) { | |
b5b571a3 | 581 | #ifdef FIO_INC_DEBUG |
aad918e4 | 582 | fio_debug &= ~(1U << FD_TIME); |
b5b571a3 | 583 | #endif |
aad918e4 | 584 | } |
4f1d43c2 | 585 | |
8a1db9a1 | 586 | cthreads = malloc(nr_cpus * sizeof(struct clock_thread)); |
aad918e4 | 587 | tentries = nr_entries * nr_cpus; |
7d11f871 JA |
588 | entries = malloc(tentries * sizeof(struct clock_entry)); |
589 | ||
aad918e4 JA |
590 | if (debug) |
591 | log_info("cs: Testing %u CPUs\n", nr_cpus); | |
7d11f871 JA |
592 | |
593 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 594 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
595 | |
596 | t->cpu = i; | |
aad918e4 | 597 | t->debug = debug; |
7d11f871 | 598 | t->seq = &seq; |
aad918e4 JA |
599 | t->nr_entries = nr_entries; |
600 | t->entries = &entries[i * nr_entries]; | |
7d11f871 JA |
601 | pthread_mutex_init(&t->lock, NULL); |
602 | pthread_mutex_init(&t->started, NULL); | |
603 | pthread_mutex_lock(&t->lock); | |
6b0110cd JA |
604 | if (pthread_create(&t->thread, NULL, clock_thread_fn, t)) { |
605 | failed++; | |
606 | nr_cpus = i; | |
607 | break; | |
608 | } | |
7d11f871 JA |
609 | } |
610 | ||
611 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 612 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
613 | |
614 | pthread_mutex_lock(&t->started); | |
615 | } | |
616 | ||
617 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 618 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
619 | |
620 | pthread_mutex_unlock(&t->lock); | |
621 | } | |
622 | ||
814917be | 623 | for (i = 0; i < nr_cpus; i++) { |
8a1db9a1 | 624 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
625 | void *ret; |
626 | ||
627 | pthread_join(t->thread, &ret); | |
628 | if (ret) | |
629 | failed++; | |
630 | } | |
8a1db9a1 | 631 | free(cthreads); |
7d11f871 JA |
632 | |
633 | if (failed) { | |
aad918e4 JA |
634 | if (debug) |
635 | log_err("Clocksource test: %lu threads failed\n", failed); | |
7d11f871 JA |
636 | goto err; |
637 | } | |
638 | ||
639 | qsort(entries, tentries, sizeof(struct clock_entry), clock_cmp); | |
640 | ||
641 | for (failed = i = 0; i < tentries; i++) { | |
80da8a8f | 642 | this = &entries[i]; |
7d11f871 JA |
643 | |
644 | if (!i) { | |
645 | prev = this; | |
646 | continue; | |
647 | } | |
648 | ||
649 | if (prev->tsc > this->tsc) { | |
650 | uint64_t diff = prev->tsc - this->tsc; | |
651 | ||
aad918e4 JA |
652 | if (!debug) { |
653 | failed++; | |
654 | break; | |
655 | } | |
656 | ||
4e0a8fa2 JA |
657 | log_info("cs: CPU clock mismatch (diff=%llu):\n", |
658 | (unsigned long long) diff); | |
659 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", prev->cpu, (unsigned long long) prev->tsc, prev->seq); | |
660 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", this->cpu, (unsigned long long) this->tsc, this->seq); | |
7d11f871 JA |
661 | failed++; |
662 | } | |
663 | ||
664 | prev = this; | |
665 | } | |
666 | ||
aad918e4 JA |
667 | if (debug) { |
668 | if (failed) | |
669 | log_info("cs: Failed: %lu\n", failed); | |
670 | else | |
671 | log_info("cs: Pass!\n"); | |
672 | } | |
7d11f871 JA |
673 | err: |
674 | free(entries); | |
675 | return !!failed; | |
676 | } | |
677 | ||
678 | #else /* defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) */ | |
679 | ||
aad918e4 | 680 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 681 | { |
aad918e4 JA |
682 | if (debug) |
683 | log_info("cs: current platform does not support CPU clocks\n"); | |
684 | return 1; | |
7d11f871 JA |
685 | } |
686 | ||
687 | #endif |