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