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