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; |
6d02b37b VF |
19 | static unsigned long long cycles_start; |
20 | static unsigned long long clock_mult; | |
21 | static unsigned long long max_cycles_mask; | |
22 | static unsigned long long nsecs_for_max_cycles; | |
23 | static unsigned int clock_shift; | |
24 | static unsigned int max_cycles_shift; | |
25 | #define MAX_CLOCK_SEC 60*60 | |
96170421 CE |
26 | #endif |
27 | #ifdef ARCH_CPU_CLOCK_WRAPS | |
6d02b37b | 28 | static unsigned int cycles_wrap; |
09a32402 | 29 | #endif |
dac499a0 | 30 | #endif |
4de98eb0 | 31 | int tsc_reliable = 0; |
5d879392 JA |
32 | |
33 | struct tv_valid { | |
ba458c2f | 34 | uint64_t last_cycles; |
02dcf81c JA |
35 | int last_tv_valid; |
36 | int warned; | |
5d879392 | 37 | }; |
03be65c9 | 38 | #ifdef ARCH_HAVE_CPU_CLOCK |
67bf9823 | 39 | #ifdef CONFIG_TLS_THREAD |
b4ea84da | 40 | static __thread struct tv_valid static_tv_valid; |
67bf9823 | 41 | #else |
5d879392 | 42 | static pthread_key_t tv_tls_key; |
67bf9823 | 43 | #endif |
03be65c9 | 44 | #endif |
02bcaa8c | 45 | |
16de1bf9 | 46 | enum fio_cs fio_clock_source = FIO_PREFERRED_CLOCK_SOURCE; |
fa80feae | 47 | int fio_clock_source_set = 0; |
10aa136b | 48 | static enum fio_cs fio_clock_source_inited = CS_INVAL; |
c223da83 | 49 | |
02bcaa8c JA |
50 | #ifdef FIO_DEBUG_TIME |
51 | ||
52 | #define HASH_BITS 8 | |
53 | #define HASH_SIZE (1 << HASH_BITS) | |
54 | ||
01743ee1 | 55 | static struct flist_head hash[HASH_SIZE]; |
02bcaa8c JA |
56 | static int gtod_inited; |
57 | ||
58 | struct gtod_log { | |
01743ee1 | 59 | struct flist_head list; |
02bcaa8c JA |
60 | void *caller; |
61 | unsigned long calls; | |
62 | }; | |
63 | ||
64 | static struct gtod_log *find_hash(void *caller) | |
65 | { | |
66 | unsigned long h = hash_ptr(caller, HASH_BITS); | |
01743ee1 | 67 | struct flist_head *entry; |
02bcaa8c | 68 | |
01743ee1 JA |
69 | flist_for_each(entry, &hash[h]) { |
70 | struct gtod_log *log = flist_entry(entry, struct gtod_log, | |
71 | list); | |
02bcaa8c JA |
72 | |
73 | if (log->caller == caller) | |
74 | return log; | |
75 | } | |
76 | ||
77 | return NULL; | |
78 | } | |
79 | ||
d5e16441 | 80 | static void inc_caller(void *caller) |
02bcaa8c JA |
81 | { |
82 | struct gtod_log *log = find_hash(caller); | |
83 | ||
84 | if (!log) { | |
85 | unsigned long h; | |
86 | ||
87 | log = malloc(sizeof(*log)); | |
01743ee1 | 88 | INIT_FLIST_HEAD(&log->list); |
02bcaa8c JA |
89 | log->caller = caller; |
90 | log->calls = 0; | |
91 | ||
92 | h = hash_ptr(caller, HASH_BITS); | |
01743ee1 | 93 | flist_add_tail(&log->list, &hash[h]); |
02bcaa8c JA |
94 | } |
95 | ||
d5e16441 | 96 | log->calls++; |
02bcaa8c JA |
97 | } |
98 | ||
99 | static void gtod_log_caller(void *caller) | |
100 | { | |
d5e16441 JA |
101 | if (gtod_inited) |
102 | inc_caller(caller); | |
02bcaa8c JA |
103 | } |
104 | ||
105 | static void fio_exit fio_dump_gtod(void) | |
106 | { | |
107 | unsigned long total_calls = 0; | |
108 | int i; | |
109 | ||
110 | for (i = 0; i < HASH_SIZE; i++) { | |
01743ee1 | 111 | struct flist_head *entry; |
02bcaa8c JA |
112 | struct gtod_log *log; |
113 | ||
01743ee1 JA |
114 | flist_for_each(entry, &hash[i]) { |
115 | log = flist_entry(entry, struct gtod_log, list); | |
02bcaa8c | 116 | |
5ec10eaa JA |
117 | printf("function %p, calls %lu\n", log->caller, |
118 | log->calls); | |
02bcaa8c JA |
119 | total_calls += log->calls; |
120 | } | |
121 | } | |
122 | ||
123 | printf("Total %lu gettimeofday\n", total_calls); | |
124 | } | |
125 | ||
126 | static void fio_init gtod_init(void) | |
127 | { | |
128 | int i; | |
129 | ||
130 | for (i = 0; i < HASH_SIZE; i++) | |
01743ee1 | 131 | INIT_FLIST_HEAD(&hash[i]); |
02bcaa8c JA |
132 | |
133 | gtod_inited = 1; | |
134 | } | |
135 | ||
136 | #endif /* FIO_DEBUG_TIME */ | |
137 | ||
67bf9823 | 138 | #ifdef CONFIG_CLOCK_GETTIME |
9ff1c070 JA |
139 | static int fill_clock_gettime(struct timespec *ts) |
140 | { | |
c544f604 SN |
141 | #if defined(CONFIG_CLOCK_MONOTONIC_RAW) |
142 | return clock_gettime(CLOCK_MONOTONIC_RAW, ts); | |
143 | #elif defined(CONFIG_CLOCK_MONOTONIC) | |
9ff1c070 JA |
144 | return clock_gettime(CLOCK_MONOTONIC, ts); |
145 | #else | |
146 | return clock_gettime(CLOCK_REALTIME, ts); | |
147 | #endif | |
148 | } | |
1e97cce9 | 149 | #endif |
67bf9823 | 150 | |
8b6a404c | 151 | static void __fio_gettime(struct timespec *tp) |
02bcaa8c | 152 | { |
c223da83 | 153 | switch (fio_clock_source) { |
67bf9823 | 154 | #ifdef CONFIG_GETTIMEOFDAY |
8b6a404c VF |
155 | case CS_GTOD: { |
156 | struct timeval tv; | |
157 | gettimeofday(&tv, NULL); | |
158 | ||
159 | tp->tv_sec = tv.tv_sec; | |
160 | tp->tv_nsec = tv.tv_usec * 1000; | |
c223da83 | 161 | break; |
8b6a404c | 162 | } |
67bf9823 JA |
163 | #endif |
164 | #ifdef CONFIG_CLOCK_GETTIME | |
c223da83 | 165 | case CS_CGETTIME: { |
8b6a404c | 166 | if (fill_clock_gettime(tp) < 0) { |
c223da83 JA |
167 | log_err("fio: clock_gettime fails\n"); |
168 | assert(0); | |
02bcaa8c | 169 | } |
c223da83 JA |
170 | break; |
171 | } | |
67bf9823 | 172 | #endif |
c223da83 JA |
173 | #ifdef ARCH_HAVE_CPU_CLOCK |
174 | case CS_CPUCLOCK: { | |
6d02b37b | 175 | uint64_t nsecs, t, multiples; |
03be65c9 JA |
176 | struct tv_valid *tv; |
177 | ||
178 | #ifdef CONFIG_TLS_THREAD | |
179 | tv = &static_tv_valid; | |
180 | #else | |
181 | tv = pthread_getspecific(tv_tls_key); | |
182 | #endif | |
c223da83 JA |
183 | |
184 | t = get_cpu_clock(); | |
96170421 | 185 | #ifdef ARCH_CPU_CLOCK_WRAPS |
73df3e07 JA |
186 | if (t < cycles_start && !cycles_wrap) |
187 | cycles_wrap = 1; | |
03be65c9 JA |
188 | else if (cycles_wrap && t >= cycles_start && !tv->warned) { |
189 | log_err("fio: double CPU clock wrap\n"); | |
190 | tv->warned = 1; | |
02dcf81c | 191 | } |
96170421 | 192 | #endif |
919e789d | 193 | #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
6d02b37b | 194 | nsecs = t / ARCH_CPU_CLOCK_CYCLES_PER_USEC * 1000; |
919e789d | 195 | #else |
6d02b37b VF |
196 | t -= cycles_start; |
197 | multiples = t >> max_cycles_shift; | |
198 | nsecs = multiples * nsecs_for_max_cycles; | |
199 | nsecs += ((t & max_cycles_mask) * clock_mult) >> clock_shift; | |
919e789d | 200 | #endif |
6d02b37b VF |
201 | tv->last_cycles = t; |
202 | tv->last_tv_valid = 1; | |
203 | ||
8b6a404c VF |
204 | tp->tv_sec = nsecs / 1000000000ULL; |
205 | tp->tv_nsec = nsecs % 1000000000ULL; | |
c223da83 JA |
206 | break; |
207 | } | |
208 | #endif | |
209 | default: | |
210 | log_err("fio: invalid clock source %d\n", fio_clock_source); | |
211 | break; | |
02bcaa8c | 212 | } |
67bf9823 JA |
213 | } |
214 | ||
215 | #ifdef FIO_DEBUG_TIME | |
8b6a404c | 216 | void fio_gettime(struct timespec *tp, void *caller) |
67bf9823 | 217 | #else |
8b6a404c | 218 | void fio_gettime(struct timespec *tp, void fio_unused *caller) |
67bf9823 JA |
219 | #endif |
220 | { | |
67bf9823 JA |
221 | #ifdef FIO_DEBUG_TIME |
222 | if (!caller) | |
223 | caller = __builtin_return_address(0); | |
224 | ||
225 | gtod_log_caller(caller); | |
226 | #endif | |
27325ed5 | 227 | if (fio_unlikely(fio_gettime_offload(tp))) |
67bf9823 | 228 | return; |
67bf9823 | 229 | |
9eb271b9 | 230 | __fio_gettime(tp); |
02bcaa8c | 231 | } |
be4ecfdf | 232 | |
919e789d | 233 | #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(ARCH_CPU_CLOCK_CYCLES_PER_USEC) |
c223da83 JA |
234 | static unsigned long get_cycles_per_usec(void) |
235 | { | |
8b6a404c | 236 | struct timespec s, e; |
ba458c2f | 237 | uint64_t c_s, c_e; |
67bf9823 | 238 | enum fio_cs old_cs = fio_clock_source; |
99afcdb5 | 239 | uint64_t elapsed; |
c223da83 | 240 | |
67bf9823 JA |
241 | #ifdef CONFIG_CLOCK_GETTIME |
242 | fio_clock_source = CS_CGETTIME; | |
243 | #else | |
244 | fio_clock_source = CS_GTOD; | |
245 | #endif | |
246 | __fio_gettime(&s); | |
9ff1c070 | 247 | |
c223da83 JA |
248 | c_s = get_cpu_clock(); |
249 | do { | |
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; |
13aa415a | 260 | return (c_e - c_s) / elapsed; |
c223da83 JA |
261 | } |
262 | ||
fa80feae JA |
263 | #define NR_TIME_ITERS 50 |
264 | ||
e259879e | 265 | static int calibrate_cpu_clock(void) |
c223da83 JA |
266 | { |
267 | double delta, mean, S; | |
e51a6629 | 268 | uint64_t minc, maxc, avg, cycles[NR_TIME_ITERS]; |
6d02b37b VF |
269 | int i, samples, sft = 0; |
270 | unsigned long long tmp, max_ticks, max_mult; | |
c223da83 | 271 | |
c223da83 JA |
272 | cycles[0] = get_cycles_per_usec(); |
273 | S = delta = mean = 0.0; | |
fa80feae | 274 | for (i = 0; i < NR_TIME_ITERS; i++) { |
c223da83 JA |
275 | cycles[i] = get_cycles_per_usec(); |
276 | delta = cycles[i] - mean; | |
277 | if (delta) { | |
278 | mean += delta / (i + 1.0); | |
279 | S += delta * (cycles[i] - mean); | |
280 | } | |
281 | } | |
282 | ||
e259879e JA |
283 | /* |
284 | * The most common platform clock breakage is returning zero | |
285 | * indefinitely. Check for that and return failure. | |
286 | */ | |
287 | if (!cycles[0] && !cycles[NR_TIME_ITERS - 1]) | |
288 | return 1; | |
289 | ||
fa80feae | 290 | S = sqrt(S / (NR_TIME_ITERS - 1.0)); |
c223da83 | 291 | |
e51a6629 JA |
292 | minc = -1ULL; |
293 | maxc = samples = avg = 0; | |
fa80feae | 294 | for (i = 0; i < NR_TIME_ITERS; i++) { |
c223da83 JA |
295 | double this = cycles[i]; |
296 | ||
e51a6629 JA |
297 | minc = min(cycles[i], minc); |
298 | maxc = max(cycles[i], maxc); | |
299 | ||
03e20d68 | 300 | if ((fmax(this, mean) - fmin(this, mean)) > S) |
c223da83 JA |
301 | continue; |
302 | samples++; | |
303 | avg += this; | |
304 | } | |
305 | ||
fa80feae | 306 | S /= (double) NR_TIME_ITERS; |
c223da83 | 307 | |
fa80feae | 308 | for (i = 0; i < NR_TIME_ITERS; i++) |
13aa415a | 309 | dprint(FD_TIME, "cycles[%d]=%llu\n", i, (unsigned long long) cycles[i]); |
c223da83 | 310 | |
d7abad3d | 311 | avg /= samples; |
6d02b37b | 312 | cycles_per_usec = avg; |
4b91ee8f | 313 | dprint(FD_TIME, "avg: %llu\n", (unsigned long long) avg); |
e51a6629 JA |
314 | dprint(FD_TIME, "min=%llu, max=%llu, mean=%f, S=%f\n", |
315 | (unsigned long long) minc, | |
316 | (unsigned long long) maxc, mean, S); | |
c223da83 | 317 | |
6d02b37b VF |
318 | max_ticks = MAX_CLOCK_SEC * cycles_per_usec * 1000000ULL; |
319 | max_mult = ULLONG_MAX / max_ticks; | |
320 | dprint(FD_TIME, "\n\nmax_ticks=%llu, __builtin_clzll=%d, max_mult=%llu\n", | |
321 | max_ticks, __builtin_clzll(max_ticks), max_mult); | |
322 | ||
323 | /* | |
324 | * Find the largest shift count that will produce | |
325 | * a multiplier that does not exceed max_mult | |
326 | */ | |
327 | tmp = max_mult * cycles_per_usec / 1000; | |
328 | while (tmp > 1) { | |
329 | tmp >>= 1; | |
330 | sft++; | |
331 | dprint(FD_TIME, "tmp=%llu, sft=%u\n", tmp, sft); | |
332 | } | |
333 | ||
334 | clock_shift = sft; | |
335 | clock_mult = (1ULL << sft) * 1000 / cycles_per_usec; | |
336 | dprint(FD_TIME, "clock_shift=%u, clock_mult=%llu\n", clock_shift, clock_mult); | |
337 | ||
338 | // Find the greatest power of 2 clock ticks that is less than the ticks in MAX_CLOCK_SEC_2STAGE | |
339 | max_cycles_shift = max_cycles_mask = 0; | |
340 | tmp = MAX_CLOCK_SEC * 1000000ULL * cycles_per_usec; | |
341 | dprint(FD_TIME, "tmp=%llu, max_cycles_shift=%u\n", tmp, max_cycles_shift); | |
342 | while (tmp > 1) { | |
343 | tmp >>= 1; | |
344 | max_cycles_shift++; | |
345 | dprint(FD_TIME, "tmp=%llu, max_cycles_shift=%u\n", tmp, max_cycles_shift); | |
346 | } | |
347 | // if use use (1ULL << max_cycles_shift) * 1000 / cycles_per_usec here we will | |
348 | // have a discontinuity every (1ULL << max_cycles_shift) cycles | |
349 | nsecs_for_max_cycles = ((1ULL << max_cycles_shift) * clock_mult) >> clock_shift; | |
350 | ||
351 | // Use a bitmask to calculate ticks % (1ULL << max_cycles_shift) | |
352 | for (tmp = 0; tmp < max_cycles_shift; tmp++) | |
353 | max_cycles_mask |= 1ULL << tmp; | |
354 | ||
355 | dprint(FD_TIME, "max_cycles_shift=%u, 2^max_cycles_shift=%llu, nsecs_for_max_cycles=%llu, max_cycles_mask=%016llx\n", | |
356 | max_cycles_shift, (1ULL << max_cycles_shift), | |
357 | nsecs_for_max_cycles, max_cycles_mask); | |
358 | ||
73df3e07 JA |
359 | cycles_start = get_cpu_clock(); |
360 | dprint(FD_TIME, "cycles_start=%llu\n", cycles_start); | |
e259879e | 361 | return 0; |
09a32402 JA |
362 | } |
363 | #else | |
e259879e | 364 | static int calibrate_cpu_clock(void) |
09a32402 | 365 | { |
919e789d CE |
366 | #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
367 | return 0; | |
368 | #else | |
e259879e | 369 | return 1; |
09a32402 | 370 | #endif |
919e789d CE |
371 | } |
372 | #endif // ARCH_HAVE_CPU_CLOCK | |
09a32402 | 373 | |
67bf9823 | 374 | #ifndef CONFIG_TLS_THREAD |
5d879392 JA |
375 | void fio_local_clock_init(int is_thread) |
376 | { | |
377 | struct tv_valid *t; | |
378 | ||
572cfb3f | 379 | t = calloc(1, sizeof(*t)); |
9eb271b9 | 380 | if (pthread_setspecific(tv_tls_key, t)) { |
5d879392 | 381 | log_err("fio: can't set TLS key\n"); |
9eb271b9 JA |
382 | assert(0); |
383 | } | |
5d879392 JA |
384 | } |
385 | ||
386 | static void kill_tv_tls_key(void *data) | |
387 | { | |
388 | free(data); | |
389 | } | |
67bf9823 JA |
390 | #else |
391 | void fio_local_clock_init(int is_thread) | |
392 | { | |
393 | } | |
394 | #endif | |
5d879392 | 395 | |
09a32402 JA |
396 | void fio_clock_init(void) |
397 | { | |
01423eae JA |
398 | if (fio_clock_source == fio_clock_source_inited) |
399 | return; | |
400 | ||
67bf9823 | 401 | #ifndef CONFIG_TLS_THREAD |
5d879392 JA |
402 | if (pthread_key_create(&tv_tls_key, kill_tv_tls_key)) |
403 | log_err("fio: can't create TLS key\n"); | |
67bf9823 | 404 | #endif |
5d879392 | 405 | |
01423eae | 406 | fio_clock_source_inited = fio_clock_source; |
e259879e JA |
407 | |
408 | if (calibrate_cpu_clock()) | |
409 | tsc_reliable = 0; | |
fa80feae JA |
410 | |
411 | /* | |
412 | * If the arch sets tsc_reliable != 0, then it must be good enough | |
413 | * to use as THE clock source. For x86 CPUs, this means the TSC | |
414 | * runs at a constant rate and is synced across CPU cores. | |
415 | */ | |
416 | if (tsc_reliable) { | |
aad918e4 | 417 | if (!fio_clock_source_set && !fio_monotonic_clocktest(0)) |
fa80feae JA |
418 | fio_clock_source = CS_CPUCLOCK; |
419 | } else if (fio_clock_source == CS_CPUCLOCK) | |
420 | log_info("fio: clocksource=cpu may not be reliable\n"); | |
c223da83 JA |
421 | } |
422 | ||
d6bb626e VF |
423 | uint64_t ntime_since(const struct timespec *s, const struct timespec *e) |
424 | { | |
425 | int64_t sec, nsec; | |
426 | ||
427 | sec = e->tv_sec - s->tv_sec; | |
428 | nsec = e->tv_nsec - s->tv_nsec; | |
429 | if (sec > 0 && nsec < 0) { | |
6d02b37b VF |
430 | sec--; |
431 | nsec += 1000000000LL; | |
d6bb626e VF |
432 | } |
433 | ||
434 | /* | |
6d02b37b VF |
435 | * time warp bug on some kernels? |
436 | */ | |
d6bb626e | 437 | if (sec < 0 || (sec == 0 && nsec < 0)) |
6d02b37b | 438 | return 0; |
d6bb626e VF |
439 | |
440 | return nsec + (sec * 1000000000LL); | |
441 | } | |
442 | ||
8b6a404c | 443 | uint64_t utime_since(const struct timespec *s, const struct timespec *e) |
be4ecfdf | 444 | { |
90eff1c9 | 445 | int64_t sec, usec; |
39ab7da2 JA |
446 | |
447 | sec = e->tv_sec - s->tv_sec; | |
8b6a404c | 448 | usec = (e->tv_nsec - s->tv_nsec) / 1000; |
39ab7da2 JA |
449 | if (sec > 0 && usec < 0) { |
450 | sec--; | |
451 | usec += 1000000; | |
452 | } | |
453 | ||
454 | /* | |
455 | * time warp bug on some kernels? | |
456 | */ | |
457 | if (sec < 0 || (sec == 0 && usec < 0)) | |
458 | return 0; | |
459 | ||
20ac4e77 | 460 | return usec + (sec * 1000000); |
be4ecfdf JA |
461 | } |
462 | ||
8b6a404c | 463 | uint64_t utime_since_now(const struct timespec *s) |
be4ecfdf | 464 | { |
8b6a404c | 465 | struct timespec t; |
f52e9198 VF |
466 | #ifdef FIO_DEBUG_TIME |
467 | void *p = __builtin_return_address(0); | |
39ab7da2 | 468 | |
f52e9198 VF |
469 | fio_gettime(&t, p); |
470 | #else | |
39ab7da2 | 471 | fio_gettime(&t, NULL); |
f52e9198 VF |
472 | #endif |
473 | ||
39ab7da2 | 474 | return utime_since(s, &t); |
be4ecfdf | 475 | } |
783a3eb1 | 476 | |
8b6a404c | 477 | uint64_t mtime_since_tv(const struct timeval *s, const struct timeval *e) |
783a3eb1 | 478 | { |
8b6a404c | 479 | int64_t sec, usec; |
783a3eb1 | 480 | |
39ab7da2 | 481 | sec = e->tv_sec - s->tv_sec; |
8b6a404c | 482 | usec = (e->tv_usec - s->tv_usec); |
39ab7da2 JA |
483 | if (sec > 0 && usec < 0) { |
484 | sec--; | |
485 | usec += 1000000; | |
783a3eb1 JA |
486 | } |
487 | ||
39ab7da2 JA |
488 | if (sec < 0 || (sec == 0 && usec < 0)) |
489 | return 0; | |
490 | ||
be6bb2b7 Y |
491 | sec *= 1000; |
492 | usec /= 1000; | |
20ac4e77 | 493 | return sec + usec; |
783a3eb1 JA |
494 | } |
495 | ||
8b6a404c | 496 | uint64_t mtime_since_now(const struct timespec *s) |
783a3eb1 | 497 | { |
8b6a404c | 498 | struct timespec t; |
f52e9198 | 499 | #ifdef FIO_DEBUG_TIME |
39ab7da2 | 500 | void *p = __builtin_return_address(0); |
783a3eb1 | 501 | |
39ab7da2 | 502 | fio_gettime(&t, p); |
f52e9198 VF |
503 | #else |
504 | fio_gettime(&t, NULL); | |
505 | #endif | |
506 | ||
39ab7da2 JA |
507 | return mtime_since(s, &t); |
508 | } | |
783a3eb1 | 509 | |
8b6a404c VF |
510 | uint64_t mtime_since(const struct timespec *s, const struct timespec *e) |
511 | { | |
512 | int64_t sec, usec; | |
513 | ||
514 | sec = e->tv_sec - s->tv_sec; | |
515 | usec = (e->tv_nsec - s->tv_nsec) / 1000; | |
516 | if (sec > 0 && usec < 0) { | |
517 | sec--; | |
518 | usec += 1000000; | |
519 | } | |
520 | ||
521 | if (sec < 0 || (sec == 0 && usec < 0)) | |
522 | return 0; | |
523 | ||
524 | sec *= 1000; | |
525 | usec /= 1000; | |
526 | return sec + usec; | |
527 | } | |
528 | ||
529 | uint64_t time_since_now(const struct timespec *s) | |
39ab7da2 JA |
530 | { |
531 | return mtime_since_now(s) / 1000; | |
783a3eb1 | 532 | } |
7d11f871 | 533 | |
67bf9823 JA |
534 | #if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) && \ |
535 | defined(CONFIG_SFAA) | |
7d11f871 | 536 | |
aad918e4 JA |
537 | #define CLOCK_ENTRIES_DEBUG 100000 |
538 | #define CLOCK_ENTRIES_TEST 10000 | |
7d11f871 JA |
539 | |
540 | struct clock_entry { | |
58002f9a JA |
541 | uint32_t seq; |
542 | uint32_t cpu; | |
ba458c2f | 543 | uint64_t tsc; |
7d11f871 JA |
544 | }; |
545 | ||
546 | struct clock_thread { | |
547 | pthread_t thread; | |
548 | int cpu; | |
aad918e4 | 549 | int debug; |
7d11f871 JA |
550 | pthread_mutex_t lock; |
551 | pthread_mutex_t started; | |
aad918e4 | 552 | unsigned long nr_entries; |
58002f9a | 553 | uint32_t *seq; |
7d11f871 JA |
554 | struct clock_entry *entries; |
555 | }; | |
556 | ||
58002f9a | 557 | static inline uint32_t atomic32_inc_return(uint32_t *seq) |
7d11f871 JA |
558 | { |
559 | return 1 + __sync_fetch_and_add(seq, 1); | |
560 | } | |
561 | ||
562 | static void *clock_thread_fn(void *data) | |
563 | { | |
564 | struct clock_thread *t = data; | |
565 | struct clock_entry *c; | |
566 | os_cpu_mask_t cpu_mask; | |
58002f9a | 567 | uint32_t last_seq; |
5896d827 | 568 | unsigned long long first; |
7d11f871 JA |
569 | int i; |
570 | ||
c763aea6 | 571 | if (fio_cpuset_init(&cpu_mask)) { |
37e20021 | 572 | int __err = errno; |
c763aea6 JA |
573 | |
574 | log_err("clock cpuset init failed: %s\n", strerror(__err)); | |
575 | goto err_out; | |
576 | } | |
577 | ||
7d11f871 JA |
578 | fio_cpu_set(&cpu_mask, t->cpu); |
579 | ||
580 | if (fio_setaffinity(gettid(), cpu_mask) == -1) { | |
e66d7f90 JA |
581 | int __err = errno; |
582 | ||
583 | log_err("clock setaffinity failed: %s\n", strerror(__err)); | |
c763aea6 | 584 | goto err; |
7d11f871 JA |
585 | } |
586 | ||
7d11f871 | 587 | pthread_mutex_lock(&t->lock); |
b9b3498e | 588 | pthread_mutex_unlock(&t->started); |
7d11f871 | 589 | |
5896d827 | 590 | first = get_cpu_clock(); |
58002f9a | 591 | last_seq = 0; |
7d11f871 | 592 | c = &t->entries[0]; |
aad918e4 | 593 | for (i = 0; i < t->nr_entries; i++, c++) { |
58002f9a JA |
594 | uint32_t seq; |
595 | uint64_t tsc; | |
7d11f871 JA |
596 | |
597 | c->cpu = t->cpu; | |
598 | do { | |
58002f9a JA |
599 | seq = atomic32_inc_return(t->seq); |
600 | if (seq < last_seq) | |
601 | break; | |
7d11f871 JA |
602 | tsc = get_cpu_clock(); |
603 | } while (seq != *t->seq); | |
604 | ||
605 | c->seq = seq; | |
606 | c->tsc = tsc; | |
607 | } | |
608 | ||
aad918e4 JA |
609 | if (t->debug) { |
610 | unsigned long long clocks; | |
611 | ||
612 | clocks = t->entries[i - 1].tsc - t->entries[0].tsc; | |
5896d827 JA |
613 | log_info("cs: cpu%3d: %llu clocks seen, first %llu\n", t->cpu, |
614 | clocks, first); | |
aad918e4 | 615 | } |
58002f9a | 616 | |
e259879e JA |
617 | /* |
618 | * The most common platform clock breakage is returning zero | |
619 | * indefinitely. Check for that and return failure. | |
620 | */ | |
58002f9a | 621 | if (!t->entries[i - 1].tsc && !t->entries[0].tsc) |
c763aea6 | 622 | goto err; |
e259879e | 623 | |
d47d7cb3 | 624 | fio_cpuset_exit(&cpu_mask); |
7d11f871 | 625 | return NULL; |
c763aea6 JA |
626 | err: |
627 | fio_cpuset_exit(&cpu_mask); | |
628 | err_out: | |
629 | return (void *) 1; | |
7d11f871 JA |
630 | } |
631 | ||
632 | static int clock_cmp(const void *p1, const void *p2) | |
633 | { | |
634 | const struct clock_entry *c1 = p1; | |
635 | const struct clock_entry *c2 = p2; | |
636 | ||
b9b3498e JA |
637 | if (c1->seq == c2->seq) |
638 | log_err("cs: bug in atomic sequence!\n"); | |
639 | ||
7d11f871 JA |
640 | return c1->seq - c2->seq; |
641 | } | |
642 | ||
aad918e4 | 643 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 644 | { |
8a1db9a1 | 645 | struct clock_thread *cthreads; |
7d11f871 JA |
646 | unsigned int nr_cpus = cpus_online(); |
647 | struct clock_entry *entries; | |
aad918e4 | 648 | unsigned long nr_entries, tentries, failed = 0; |
80da8a8f | 649 | struct clock_entry *prev, *this; |
58002f9a | 650 | uint32_t seq = 0; |
caa3eb1c | 651 | unsigned int i; |
7d11f871 | 652 | |
aad918e4 JA |
653 | if (debug) { |
654 | log_info("cs: reliable_tsc: %s\n", tsc_reliable ? "yes" : "no"); | |
d5e3f5d8 | 655 | |
b5b571a3 | 656 | #ifdef FIO_INC_DEBUG |
aad918e4 | 657 | fio_debug |= 1U << FD_TIME; |
b5b571a3 | 658 | #endif |
aad918e4 JA |
659 | nr_entries = CLOCK_ENTRIES_DEBUG; |
660 | } else | |
661 | nr_entries = CLOCK_ENTRIES_TEST; | |
662 | ||
4f1d43c2 | 663 | calibrate_cpu_clock(); |
aad918e4 JA |
664 | |
665 | if (debug) { | |
b5b571a3 | 666 | #ifdef FIO_INC_DEBUG |
aad918e4 | 667 | fio_debug &= ~(1U << FD_TIME); |
b5b571a3 | 668 | #endif |
aad918e4 | 669 | } |
4f1d43c2 | 670 | |
8a1db9a1 | 671 | cthreads = malloc(nr_cpus * sizeof(struct clock_thread)); |
aad918e4 | 672 | tentries = nr_entries * nr_cpus; |
7d11f871 JA |
673 | entries = malloc(tentries * sizeof(struct clock_entry)); |
674 | ||
aad918e4 JA |
675 | if (debug) |
676 | log_info("cs: Testing %u CPUs\n", nr_cpus); | |
7d11f871 JA |
677 | |
678 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 679 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
680 | |
681 | t->cpu = i; | |
aad918e4 | 682 | t->debug = debug; |
7d11f871 | 683 | t->seq = &seq; |
aad918e4 JA |
684 | t->nr_entries = nr_entries; |
685 | t->entries = &entries[i * nr_entries]; | |
7d11f871 JA |
686 | pthread_mutex_init(&t->lock, NULL); |
687 | pthread_mutex_init(&t->started, NULL); | |
688 | pthread_mutex_lock(&t->lock); | |
6b0110cd JA |
689 | if (pthread_create(&t->thread, NULL, clock_thread_fn, t)) { |
690 | failed++; | |
691 | nr_cpus = i; | |
692 | break; | |
693 | } | |
7d11f871 JA |
694 | } |
695 | ||
696 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 697 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
698 | |
699 | pthread_mutex_lock(&t->started); | |
700 | } | |
701 | ||
702 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 703 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
704 | |
705 | pthread_mutex_unlock(&t->lock); | |
706 | } | |
707 | ||
814917be | 708 | for (i = 0; i < nr_cpus; i++) { |
8a1db9a1 | 709 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
710 | void *ret; |
711 | ||
712 | pthread_join(t->thread, &ret); | |
713 | if (ret) | |
714 | failed++; | |
715 | } | |
8a1db9a1 | 716 | free(cthreads); |
7d11f871 JA |
717 | |
718 | if (failed) { | |
aad918e4 JA |
719 | if (debug) |
720 | log_err("Clocksource test: %lu threads failed\n", failed); | |
7d11f871 JA |
721 | goto err; |
722 | } | |
723 | ||
724 | qsort(entries, tentries, sizeof(struct clock_entry), clock_cmp); | |
725 | ||
a4aa3dc0 JA |
726 | /* silence silly gcc */ |
727 | prev = NULL; | |
7d11f871 | 728 | for (failed = i = 0; i < tentries; i++) { |
80da8a8f | 729 | this = &entries[i]; |
7d11f871 JA |
730 | |
731 | if (!i) { | |
732 | prev = this; | |
733 | continue; | |
734 | } | |
735 | ||
736 | if (prev->tsc > this->tsc) { | |
737 | uint64_t diff = prev->tsc - this->tsc; | |
738 | ||
aad918e4 JA |
739 | if (!debug) { |
740 | failed++; | |
741 | break; | |
742 | } | |
743 | ||
4e0a8fa2 JA |
744 | log_info("cs: CPU clock mismatch (diff=%llu):\n", |
745 | (unsigned long long) diff); | |
746 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", prev->cpu, (unsigned long long) prev->tsc, prev->seq); | |
747 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", this->cpu, (unsigned long long) this->tsc, this->seq); | |
7d11f871 JA |
748 | failed++; |
749 | } | |
750 | ||
751 | prev = this; | |
752 | } | |
753 | ||
aad918e4 JA |
754 | if (debug) { |
755 | if (failed) | |
756 | log_info("cs: Failed: %lu\n", failed); | |
757 | else | |
758 | log_info("cs: Pass!\n"); | |
759 | } | |
7d11f871 JA |
760 | err: |
761 | free(entries); | |
762 | return !!failed; | |
763 | } | |
764 | ||
765 | #else /* defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) */ | |
766 | ||
aad918e4 | 767 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 768 | { |
aad918e4 JA |
769 | if (debug) |
770 | log_info("cs: current platform does not support CPU clocks\n"); | |
771 | return 1; | |
7d11f871 JA |
772 | } |
773 | ||
774 | #endif |