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 | { | |
c544f604 SN |
136 | #if defined(CONFIG_CLOCK_MONOTONIC_RAW) |
137 | return clock_gettime(CLOCK_MONOTONIC_RAW, ts); | |
138 | #elif defined(CONFIG_CLOCK_MONOTONIC) | |
9ff1c070 JA |
139 | return clock_gettime(CLOCK_MONOTONIC, ts); |
140 | #else | |
141 | return clock_gettime(CLOCK_REALTIME, ts); | |
142 | #endif | |
143 | } | |
1e97cce9 | 144 | #endif |
67bf9823 | 145 | |
9eb271b9 | 146 | static void __fio_gettime(struct timeval *tp) |
02bcaa8c | 147 | { |
c223da83 | 148 | switch (fio_clock_source) { |
67bf9823 | 149 | #ifdef CONFIG_GETTIMEOFDAY |
c223da83 | 150 | case CS_GTOD: |
02bcaa8c | 151 | gettimeofday(tp, NULL); |
c223da83 | 152 | break; |
67bf9823 JA |
153 | #endif |
154 | #ifdef CONFIG_CLOCK_GETTIME | |
c223da83 | 155 | case CS_CGETTIME: { |
02bcaa8c JA |
156 | struct timespec ts; |
157 | ||
9ff1c070 | 158 | if (fill_clock_gettime(&ts) < 0) { |
c223da83 JA |
159 | log_err("fio: clock_gettime fails\n"); |
160 | assert(0); | |
02bcaa8c JA |
161 | } |
162 | ||
163 | tp->tv_sec = ts.tv_sec; | |
164 | tp->tv_usec = ts.tv_nsec / 1000; | |
c223da83 JA |
165 | break; |
166 | } | |
67bf9823 | 167 | #endif |
c223da83 JA |
168 | #ifdef ARCH_HAVE_CPU_CLOCK |
169 | case CS_CPUCLOCK: { | |
ba458c2f | 170 | uint64_t usecs, t; |
03be65c9 JA |
171 | struct tv_valid *tv; |
172 | ||
173 | #ifdef CONFIG_TLS_THREAD | |
174 | tv = &static_tv_valid; | |
175 | #else | |
176 | tv = pthread_getspecific(tv_tls_key); | |
177 | #endif | |
c223da83 JA |
178 | |
179 | t = get_cpu_clock(); | |
96170421 | 180 | #ifdef ARCH_CPU_CLOCK_WRAPS |
73df3e07 JA |
181 | if (t < cycles_start && !cycles_wrap) |
182 | cycles_wrap = 1; | |
03be65c9 JA |
183 | else if (cycles_wrap && t >= cycles_start && !tv->warned) { |
184 | log_err("fio: double CPU clock wrap\n"); | |
185 | tv->warned = 1; | |
02dcf81c | 186 | } |
c223da83 | 187 | |
73df3e07 | 188 | t -= cycles_start; |
96170421 | 189 | #endif |
9eb271b9 JA |
190 | tv->last_cycles = t; |
191 | tv->last_tv_valid = 1; | |
919e789d CE |
192 | #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
193 | usecs = t / ARCH_CPU_CLOCK_CYCLES_PER_USEC; | |
194 | #else | |
b3fa625b JA |
195 | if (t < max_cycles_for_mult) |
196 | usecs = (t * inv_cycles_per_usec) / 16777216UL; | |
197 | else | |
198 | usecs = t / cycles_per_usec; | |
919e789d | 199 | #endif |
c223da83 JA |
200 | tp->tv_sec = usecs / 1000000; |
201 | tp->tv_usec = usecs % 1000000; | |
c223da83 JA |
202 | break; |
203 | } | |
204 | #endif | |
205 | default: | |
206 | log_err("fio: invalid clock source %d\n", fio_clock_source); | |
207 | break; | |
02bcaa8c | 208 | } |
67bf9823 JA |
209 | } |
210 | ||
211 | #ifdef FIO_DEBUG_TIME | |
212 | void fio_gettime(struct timeval *tp, void *caller) | |
213 | #else | |
214 | void fio_gettime(struct timeval *tp, void fio_unused *caller) | |
215 | #endif | |
216 | { | |
67bf9823 JA |
217 | #ifdef FIO_DEBUG_TIME |
218 | if (!caller) | |
219 | caller = __builtin_return_address(0); | |
220 | ||
221 | gtod_log_caller(caller); | |
222 | #endif | |
27325ed5 | 223 | if (fio_unlikely(fio_gettime_offload(tp))) |
67bf9823 | 224 | return; |
67bf9823 | 225 | |
9eb271b9 | 226 | __fio_gettime(tp); |
02bcaa8c | 227 | } |
be4ecfdf | 228 | |
919e789d | 229 | #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(ARCH_CPU_CLOCK_CYCLES_PER_USEC) |
c223da83 JA |
230 | static unsigned long get_cycles_per_usec(void) |
231 | { | |
232 | struct timeval s, e; | |
ba458c2f | 233 | uint64_t c_s, c_e; |
67bf9823 | 234 | enum fio_cs old_cs = fio_clock_source; |
99afcdb5 | 235 | uint64_t elapsed; |
c223da83 | 236 | |
67bf9823 JA |
237 | #ifdef CONFIG_CLOCK_GETTIME |
238 | fio_clock_source = CS_CGETTIME; | |
239 | #else | |
240 | fio_clock_source = CS_GTOD; | |
241 | #endif | |
242 | __fio_gettime(&s); | |
9ff1c070 | 243 | |
c223da83 JA |
244 | c_s = get_cpu_clock(); |
245 | do { | |
67bf9823 | 246 | __fio_gettime(&e); |
9ff1c070 | 247 | |
c223da83 | 248 | elapsed = utime_since(&s, &e); |
486332e5 | 249 | if (elapsed >= 1280) { |
c223da83 JA |
250 | c_e = get_cpu_clock(); |
251 | break; | |
252 | } | |
253 | } while (1); | |
254 | ||
67bf9823 | 255 | fio_clock_source = old_cs; |
13aa415a | 256 | return (c_e - c_s) / elapsed; |
c223da83 JA |
257 | } |
258 | ||
fa80feae JA |
259 | #define NR_TIME_ITERS 50 |
260 | ||
e259879e | 261 | static int calibrate_cpu_clock(void) |
c223da83 JA |
262 | { |
263 | double delta, mean, S; | |
e51a6629 | 264 | uint64_t minc, maxc, avg, cycles[NR_TIME_ITERS]; |
c223da83 JA |
265 | int i, samples; |
266 | ||
c223da83 JA |
267 | cycles[0] = get_cycles_per_usec(); |
268 | S = delta = mean = 0.0; | |
fa80feae | 269 | for (i = 0; i < NR_TIME_ITERS; i++) { |
c223da83 JA |
270 | cycles[i] = get_cycles_per_usec(); |
271 | delta = cycles[i] - mean; | |
272 | if (delta) { | |
273 | mean += delta / (i + 1.0); | |
274 | S += delta * (cycles[i] - mean); | |
275 | } | |
276 | } | |
277 | ||
e259879e JA |
278 | /* |
279 | * The most common platform clock breakage is returning zero | |
280 | * indefinitely. Check for that and return failure. | |
281 | */ | |
282 | if (!cycles[0] && !cycles[NR_TIME_ITERS - 1]) | |
283 | return 1; | |
284 | ||
fa80feae | 285 | S = sqrt(S / (NR_TIME_ITERS - 1.0)); |
c223da83 | 286 | |
e51a6629 JA |
287 | minc = -1ULL; |
288 | maxc = samples = avg = 0; | |
fa80feae | 289 | for (i = 0; i < NR_TIME_ITERS; i++) { |
c223da83 JA |
290 | double this = cycles[i]; |
291 | ||
e51a6629 JA |
292 | minc = min(cycles[i], minc); |
293 | maxc = max(cycles[i], maxc); | |
294 | ||
03e20d68 | 295 | if ((fmax(this, mean) - fmin(this, mean)) > S) |
c223da83 JA |
296 | continue; |
297 | samples++; | |
298 | avg += this; | |
299 | } | |
300 | ||
fa80feae | 301 | S /= (double) NR_TIME_ITERS; |
c223da83 | 302 | |
fa80feae | 303 | for (i = 0; i < NR_TIME_ITERS; i++) |
13aa415a | 304 | dprint(FD_TIME, "cycles[%d]=%llu\n", i, (unsigned long long) cycles[i]); |
c223da83 | 305 | |
d7abad3d | 306 | avg /= samples; |
4b91ee8f | 307 | dprint(FD_TIME, "avg: %llu\n", (unsigned long long) avg); |
e51a6629 JA |
308 | dprint(FD_TIME, "min=%llu, max=%llu, mean=%f, S=%f\n", |
309 | (unsigned long long) minc, | |
310 | (unsigned long long) maxc, mean, S); | |
c223da83 JA |
311 | |
312 | cycles_per_usec = avg; | |
71339117 | 313 | inv_cycles_per_usec = 16777216UL / cycles_per_usec; |
b3fa625b | 314 | max_cycles_for_mult = ~0ULL / inv_cycles_per_usec; |
71339117 | 315 | dprint(FD_TIME, "inv_cycles_per_usec=%lu\n", inv_cycles_per_usec); |
96170421 | 316 | #ifdef ARCH_CPU_CLOCK_WRAPS |
73df3e07 JA |
317 | cycles_start = get_cpu_clock(); |
318 | dprint(FD_TIME, "cycles_start=%llu\n", cycles_start); | |
96170421 | 319 | #endif |
e259879e | 320 | return 0; |
09a32402 JA |
321 | } |
322 | #else | |
e259879e | 323 | static int calibrate_cpu_clock(void) |
09a32402 | 324 | { |
919e789d CE |
325 | #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
326 | return 0; | |
327 | #else | |
e259879e | 328 | return 1; |
09a32402 | 329 | #endif |
919e789d CE |
330 | } |
331 | #endif // ARCH_HAVE_CPU_CLOCK | |
09a32402 | 332 | |
67bf9823 | 333 | #ifndef CONFIG_TLS_THREAD |
5d879392 JA |
334 | void fio_local_clock_init(int is_thread) |
335 | { | |
336 | struct tv_valid *t; | |
337 | ||
572cfb3f | 338 | t = calloc(1, sizeof(*t)); |
9eb271b9 | 339 | if (pthread_setspecific(tv_tls_key, t)) { |
5d879392 | 340 | log_err("fio: can't set TLS key\n"); |
9eb271b9 JA |
341 | assert(0); |
342 | } | |
5d879392 JA |
343 | } |
344 | ||
345 | static void kill_tv_tls_key(void *data) | |
346 | { | |
347 | free(data); | |
348 | } | |
67bf9823 JA |
349 | #else |
350 | void fio_local_clock_init(int is_thread) | |
351 | { | |
352 | } | |
353 | #endif | |
5d879392 | 354 | |
09a32402 JA |
355 | void fio_clock_init(void) |
356 | { | |
01423eae JA |
357 | if (fio_clock_source == fio_clock_source_inited) |
358 | return; | |
359 | ||
67bf9823 | 360 | #ifndef CONFIG_TLS_THREAD |
5d879392 JA |
361 | if (pthread_key_create(&tv_tls_key, kill_tv_tls_key)) |
362 | log_err("fio: can't create TLS key\n"); | |
67bf9823 | 363 | #endif |
5d879392 | 364 | |
01423eae | 365 | fio_clock_source_inited = fio_clock_source; |
e259879e JA |
366 | |
367 | if (calibrate_cpu_clock()) | |
368 | tsc_reliable = 0; | |
fa80feae JA |
369 | |
370 | /* | |
371 | * If the arch sets tsc_reliable != 0, then it must be good enough | |
372 | * to use as THE clock source. For x86 CPUs, this means the TSC | |
373 | * runs at a constant rate and is synced across CPU cores. | |
374 | */ | |
375 | if (tsc_reliable) { | |
aad918e4 | 376 | if (!fio_clock_source_set && !fio_monotonic_clocktest(0)) |
fa80feae JA |
377 | fio_clock_source = CS_CPUCLOCK; |
378 | } else if (fio_clock_source == CS_CPUCLOCK) | |
379 | log_info("fio: clocksource=cpu may not be reliable\n"); | |
c223da83 JA |
380 | } |
381 | ||
1f440ece | 382 | uint64_t utime_since(const struct timeval *s, const struct timeval *e) |
be4ecfdf | 383 | { |
39ab7da2 | 384 | long sec, usec; |
aa60bc58 | 385 | uint64_t ret; |
39ab7da2 JA |
386 | |
387 | sec = e->tv_sec - s->tv_sec; | |
388 | usec = e->tv_usec - s->tv_usec; | |
389 | if (sec > 0 && usec < 0) { | |
390 | sec--; | |
391 | usec += 1000000; | |
392 | } | |
393 | ||
394 | /* | |
395 | * time warp bug on some kernels? | |
396 | */ | |
397 | if (sec < 0 || (sec == 0 && usec < 0)) | |
398 | return 0; | |
399 | ||
400 | ret = sec * 1000000ULL + usec; | |
401 | ||
402 | return ret; | |
be4ecfdf JA |
403 | } |
404 | ||
1f440ece | 405 | uint64_t utime_since_now(const struct timeval *s) |
be4ecfdf | 406 | { |
39ab7da2 JA |
407 | struct timeval t; |
408 | ||
409 | fio_gettime(&t, NULL); | |
410 | return utime_since(s, &t); | |
be4ecfdf | 411 | } |
783a3eb1 | 412 | |
1f440ece | 413 | uint64_t mtime_since(const struct timeval *s, const struct timeval *e) |
783a3eb1 | 414 | { |
39ab7da2 | 415 | long sec, usec, ret; |
783a3eb1 | 416 | |
39ab7da2 JA |
417 | sec = e->tv_sec - s->tv_sec; |
418 | usec = e->tv_usec - s->tv_usec; | |
419 | if (sec > 0 && usec < 0) { | |
420 | sec--; | |
421 | usec += 1000000; | |
783a3eb1 JA |
422 | } |
423 | ||
39ab7da2 JA |
424 | if (sec < 0 || (sec == 0 && usec < 0)) |
425 | return 0; | |
426 | ||
427 | sec *= 1000UL; | |
428 | usec /= 1000UL; | |
429 | ret = sec + usec; | |
430 | ||
431 | return ret; | |
783a3eb1 JA |
432 | } |
433 | ||
1f440ece | 434 | uint64_t mtime_since_now(const struct timeval *s) |
783a3eb1 | 435 | { |
39ab7da2 JA |
436 | struct timeval t; |
437 | void *p = __builtin_return_address(0); | |
783a3eb1 | 438 | |
39ab7da2 JA |
439 | fio_gettime(&t, p); |
440 | return mtime_since(s, &t); | |
441 | } | |
783a3eb1 | 442 | |
1f440ece | 443 | uint64_t time_since_now(const struct timeval *s) |
39ab7da2 JA |
444 | { |
445 | return mtime_since_now(s) / 1000; | |
783a3eb1 | 446 | } |
7d11f871 | 447 | |
67bf9823 JA |
448 | #if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) && \ |
449 | defined(CONFIG_SFAA) | |
7d11f871 | 450 | |
aad918e4 JA |
451 | #define CLOCK_ENTRIES_DEBUG 100000 |
452 | #define CLOCK_ENTRIES_TEST 10000 | |
7d11f871 JA |
453 | |
454 | struct clock_entry { | |
58002f9a JA |
455 | uint32_t seq; |
456 | uint32_t cpu; | |
ba458c2f | 457 | uint64_t tsc; |
7d11f871 JA |
458 | }; |
459 | ||
460 | struct clock_thread { | |
461 | pthread_t thread; | |
462 | int cpu; | |
aad918e4 | 463 | int debug; |
7d11f871 JA |
464 | pthread_mutex_t lock; |
465 | pthread_mutex_t started; | |
aad918e4 | 466 | unsigned long nr_entries; |
58002f9a | 467 | uint32_t *seq; |
7d11f871 JA |
468 | struct clock_entry *entries; |
469 | }; | |
470 | ||
58002f9a | 471 | static inline uint32_t atomic32_inc_return(uint32_t *seq) |
7d11f871 JA |
472 | { |
473 | return 1 + __sync_fetch_and_add(seq, 1); | |
474 | } | |
475 | ||
476 | static void *clock_thread_fn(void *data) | |
477 | { | |
478 | struct clock_thread *t = data; | |
479 | struct clock_entry *c; | |
480 | os_cpu_mask_t cpu_mask; | |
58002f9a | 481 | uint32_t last_seq; |
5896d827 | 482 | unsigned long long first; |
7d11f871 JA |
483 | int i; |
484 | ||
c763aea6 | 485 | if (fio_cpuset_init(&cpu_mask)) { |
37e20021 | 486 | int __err = errno; |
c763aea6 JA |
487 | |
488 | log_err("clock cpuset init failed: %s\n", strerror(__err)); | |
489 | goto err_out; | |
490 | } | |
491 | ||
7d11f871 JA |
492 | fio_cpu_set(&cpu_mask, t->cpu); |
493 | ||
494 | if (fio_setaffinity(gettid(), cpu_mask) == -1) { | |
e66d7f90 JA |
495 | int __err = errno; |
496 | ||
497 | log_err("clock setaffinity failed: %s\n", strerror(__err)); | |
c763aea6 | 498 | goto err; |
7d11f871 JA |
499 | } |
500 | ||
7d11f871 | 501 | pthread_mutex_lock(&t->lock); |
b9b3498e | 502 | pthread_mutex_unlock(&t->started); |
7d11f871 | 503 | |
5896d827 | 504 | first = get_cpu_clock(); |
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; | |
5896d827 JA |
527 | log_info("cs: cpu%3d: %llu clocks seen, first %llu\n", t->cpu, |
528 | clocks, first); | |
aad918e4 | 529 | } |
58002f9a | 530 | |
e259879e JA |
531 | /* |
532 | * The most common platform clock breakage is returning zero | |
533 | * indefinitely. Check for that and return failure. | |
534 | */ | |
58002f9a | 535 | if (!t->entries[i - 1].tsc && !t->entries[0].tsc) |
c763aea6 | 536 | goto err; |
e259879e | 537 | |
d47d7cb3 | 538 | fio_cpuset_exit(&cpu_mask); |
7d11f871 | 539 | return NULL; |
c763aea6 JA |
540 | err: |
541 | fio_cpuset_exit(&cpu_mask); | |
542 | err_out: | |
543 | return (void *) 1; | |
7d11f871 JA |
544 | } |
545 | ||
546 | static int clock_cmp(const void *p1, const void *p2) | |
547 | { | |
548 | const struct clock_entry *c1 = p1; | |
549 | const struct clock_entry *c2 = p2; | |
550 | ||
b9b3498e JA |
551 | if (c1->seq == c2->seq) |
552 | log_err("cs: bug in atomic sequence!\n"); | |
553 | ||
7d11f871 JA |
554 | return c1->seq - c2->seq; |
555 | } | |
556 | ||
aad918e4 | 557 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 558 | { |
8a1db9a1 | 559 | struct clock_thread *cthreads; |
7d11f871 JA |
560 | unsigned int nr_cpus = cpus_online(); |
561 | struct clock_entry *entries; | |
aad918e4 | 562 | unsigned long nr_entries, tentries, failed = 0; |
80da8a8f | 563 | struct clock_entry *prev, *this; |
58002f9a | 564 | uint32_t seq = 0; |
caa3eb1c | 565 | unsigned int i; |
7d11f871 | 566 | |
aad918e4 JA |
567 | if (debug) { |
568 | log_info("cs: reliable_tsc: %s\n", tsc_reliable ? "yes" : "no"); | |
d5e3f5d8 | 569 | |
b5b571a3 | 570 | #ifdef FIO_INC_DEBUG |
aad918e4 | 571 | fio_debug |= 1U << FD_TIME; |
b5b571a3 | 572 | #endif |
aad918e4 JA |
573 | nr_entries = CLOCK_ENTRIES_DEBUG; |
574 | } else | |
575 | nr_entries = CLOCK_ENTRIES_TEST; | |
576 | ||
4f1d43c2 | 577 | calibrate_cpu_clock(); |
aad918e4 JA |
578 | |
579 | if (debug) { | |
b5b571a3 | 580 | #ifdef FIO_INC_DEBUG |
aad918e4 | 581 | fio_debug &= ~(1U << FD_TIME); |
b5b571a3 | 582 | #endif |
aad918e4 | 583 | } |
4f1d43c2 | 584 | |
8a1db9a1 | 585 | cthreads = malloc(nr_cpus * sizeof(struct clock_thread)); |
aad918e4 | 586 | tentries = nr_entries * nr_cpus; |
7d11f871 JA |
587 | entries = malloc(tentries * sizeof(struct clock_entry)); |
588 | ||
aad918e4 JA |
589 | if (debug) |
590 | log_info("cs: Testing %u CPUs\n", nr_cpus); | |
7d11f871 JA |
591 | |
592 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 593 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
594 | |
595 | t->cpu = i; | |
aad918e4 | 596 | t->debug = debug; |
7d11f871 | 597 | t->seq = &seq; |
aad918e4 JA |
598 | t->nr_entries = nr_entries; |
599 | t->entries = &entries[i * nr_entries]; | |
7d11f871 JA |
600 | pthread_mutex_init(&t->lock, NULL); |
601 | pthread_mutex_init(&t->started, NULL); | |
602 | pthread_mutex_lock(&t->lock); | |
6b0110cd JA |
603 | if (pthread_create(&t->thread, NULL, clock_thread_fn, t)) { |
604 | failed++; | |
605 | nr_cpus = i; | |
606 | break; | |
607 | } | |
7d11f871 JA |
608 | } |
609 | ||
610 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 611 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
612 | |
613 | pthread_mutex_lock(&t->started); | |
614 | } | |
615 | ||
616 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 617 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
618 | |
619 | pthread_mutex_unlock(&t->lock); | |
620 | } | |
621 | ||
814917be | 622 | for (i = 0; i < nr_cpus; i++) { |
8a1db9a1 | 623 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
624 | void *ret; |
625 | ||
626 | pthread_join(t->thread, &ret); | |
627 | if (ret) | |
628 | failed++; | |
629 | } | |
8a1db9a1 | 630 | free(cthreads); |
7d11f871 JA |
631 | |
632 | if (failed) { | |
aad918e4 JA |
633 | if (debug) |
634 | log_err("Clocksource test: %lu threads failed\n", failed); | |
7d11f871 JA |
635 | goto err; |
636 | } | |
637 | ||
638 | qsort(entries, tentries, sizeof(struct clock_entry), clock_cmp); | |
639 | ||
a4aa3dc0 JA |
640 | /* silence silly gcc */ |
641 | prev = NULL; | |
7d11f871 | 642 | for (failed = i = 0; i < tentries; i++) { |
80da8a8f | 643 | this = &entries[i]; |
7d11f871 JA |
644 | |
645 | if (!i) { | |
646 | prev = this; | |
647 | continue; | |
648 | } | |
649 | ||
650 | if (prev->tsc > this->tsc) { | |
651 | uint64_t diff = prev->tsc - this->tsc; | |
652 | ||
aad918e4 JA |
653 | if (!debug) { |
654 | failed++; | |
655 | break; | |
656 | } | |
657 | ||
4e0a8fa2 JA |
658 | log_info("cs: CPU clock mismatch (diff=%llu):\n", |
659 | (unsigned long long) diff); | |
660 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", prev->cpu, (unsigned long long) prev->tsc, prev->seq); | |
661 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", this->cpu, (unsigned long long) this->tsc, this->seq); | |
7d11f871 JA |
662 | failed++; |
663 | } | |
664 | ||
665 | prev = this; | |
666 | } | |
667 | ||
aad918e4 JA |
668 | if (debug) { |
669 | if (failed) | |
670 | log_info("cs: Failed: %lu\n", failed); | |
671 | else | |
672 | log_info("cs: Pass!\n"); | |
673 | } | |
7d11f871 JA |
674 | err: |
675 | free(entries); | |
676 | return !!failed; | |
677 | } | |
678 | ||
679 | #else /* defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) */ | |
680 | ||
aad918e4 | 681 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 682 | { |
aad918e4 JA |
683 | if (debug) |
684 | log_info("cs: current platform does not support CPU clocks\n"); | |
685 | return 1; | |
7d11f871 JA |
686 | } |
687 | ||
688 | #endif |