Commit | Line | Data |
---|---|---|
02bcaa8c | 1 | /* |
f5cc024a | 2 | * Clock functions |
02bcaa8c | 3 | */ |
f5cc024a | 4 | |
c223da83 | 5 | #include <math.h> |
02bcaa8c JA |
6 | |
7 | #include "fio.h" | |
7d11f871 | 8 | #include "os/os.h" |
02bcaa8c | 9 | |
dac499a0 AV |
10 | #if defined(ARCH_HAVE_CPU_CLOCK) |
11 | #ifndef ARCH_CPU_CLOCK_CYCLES_PER_USEC | |
cae9edd9 | 12 | static unsigned long long cycles_per_msec; |
6d02b37b VF |
13 | static unsigned long long cycles_start; |
14 | static unsigned long long clock_mult; | |
15 | static unsigned long long max_cycles_mask; | |
16 | static unsigned long long nsecs_for_max_cycles; | |
17 | static unsigned int clock_shift; | |
18 | static unsigned int max_cycles_shift; | |
19 | #define MAX_CLOCK_SEC 60*60 | |
96170421 CE |
20 | #endif |
21 | #ifdef ARCH_CPU_CLOCK_WRAPS | |
6d02b37b | 22 | static unsigned int cycles_wrap; |
09a32402 | 23 | #endif |
dac499a0 | 24 | #endif |
24575392 | 25 | bool tsc_reliable = false; |
5d879392 JA |
26 | |
27 | struct tv_valid { | |
02dcf81c | 28 | int warned; |
5d879392 | 29 | }; |
03be65c9 | 30 | #ifdef ARCH_HAVE_CPU_CLOCK |
67bf9823 | 31 | #ifdef CONFIG_TLS_THREAD |
b4ea84da | 32 | static __thread struct tv_valid static_tv_valid; |
67bf9823 | 33 | #else |
5d879392 | 34 | static pthread_key_t tv_tls_key; |
67bf9823 | 35 | #endif |
03be65c9 | 36 | #endif |
02bcaa8c | 37 | |
16de1bf9 | 38 | enum fio_cs fio_clock_source = FIO_PREFERRED_CLOCK_SOURCE; |
fa80feae | 39 | int fio_clock_source_set = 0; |
10aa136b | 40 | static enum fio_cs fio_clock_source_inited = CS_INVAL; |
c223da83 | 41 | |
02bcaa8c JA |
42 | #ifdef FIO_DEBUG_TIME |
43 | ||
44 | #define HASH_BITS 8 | |
45 | #define HASH_SIZE (1 << HASH_BITS) | |
46 | ||
01743ee1 | 47 | static struct flist_head hash[HASH_SIZE]; |
02bcaa8c JA |
48 | static int gtod_inited; |
49 | ||
50 | struct gtod_log { | |
01743ee1 | 51 | struct flist_head list; |
02bcaa8c JA |
52 | void *caller; |
53 | unsigned long calls; | |
54 | }; | |
55 | ||
56 | static struct gtod_log *find_hash(void *caller) | |
57 | { | |
58 | unsigned long h = hash_ptr(caller, HASH_BITS); | |
01743ee1 | 59 | struct flist_head *entry; |
02bcaa8c | 60 | |
01743ee1 JA |
61 | flist_for_each(entry, &hash[h]) { |
62 | struct gtod_log *log = flist_entry(entry, struct gtod_log, | |
63 | list); | |
02bcaa8c JA |
64 | |
65 | if (log->caller == caller) | |
66 | return log; | |
67 | } | |
68 | ||
69 | return NULL; | |
70 | } | |
71 | ||
d5e16441 | 72 | static void inc_caller(void *caller) |
02bcaa8c JA |
73 | { |
74 | struct gtod_log *log = find_hash(caller); | |
75 | ||
76 | if (!log) { | |
77 | unsigned long h; | |
78 | ||
79 | log = malloc(sizeof(*log)); | |
01743ee1 | 80 | INIT_FLIST_HEAD(&log->list); |
02bcaa8c JA |
81 | log->caller = caller; |
82 | log->calls = 0; | |
83 | ||
84 | h = hash_ptr(caller, HASH_BITS); | |
01743ee1 | 85 | flist_add_tail(&log->list, &hash[h]); |
02bcaa8c JA |
86 | } |
87 | ||
d5e16441 | 88 | log->calls++; |
02bcaa8c JA |
89 | } |
90 | ||
91 | static void gtod_log_caller(void *caller) | |
92 | { | |
d5e16441 JA |
93 | if (gtod_inited) |
94 | inc_caller(caller); | |
02bcaa8c JA |
95 | } |
96 | ||
97 | static void fio_exit fio_dump_gtod(void) | |
98 | { | |
99 | unsigned long total_calls = 0; | |
100 | int i; | |
101 | ||
102 | for (i = 0; i < HASH_SIZE; i++) { | |
01743ee1 | 103 | struct flist_head *entry; |
02bcaa8c JA |
104 | struct gtod_log *log; |
105 | ||
01743ee1 JA |
106 | flist_for_each(entry, &hash[i]) { |
107 | log = flist_entry(entry, struct gtod_log, list); | |
02bcaa8c | 108 | |
5ec10eaa JA |
109 | printf("function %p, calls %lu\n", log->caller, |
110 | log->calls); | |
02bcaa8c JA |
111 | total_calls += log->calls; |
112 | } | |
113 | } | |
114 | ||
115 | printf("Total %lu gettimeofday\n", total_calls); | |
116 | } | |
117 | ||
118 | static void fio_init gtod_init(void) | |
119 | { | |
120 | int i; | |
121 | ||
122 | for (i = 0; i < HASH_SIZE; i++) | |
01743ee1 | 123 | INIT_FLIST_HEAD(&hash[i]); |
02bcaa8c JA |
124 | |
125 | gtod_inited = 1; | |
126 | } | |
127 | ||
128 | #endif /* FIO_DEBUG_TIME */ | |
129 | ||
69212fc4 BVA |
130 | /* |
131 | * Queries the value of the monotonic clock if a monotonic clock is available | |
132 | * or the wall clock time if no monotonic clock is available. Returns 0 if | |
133 | * querying the clock succeeded or -1 if querying the clock failed. | |
134 | */ | |
135 | int fio_get_mono_time(struct timespec *ts) | |
9ff1c070 | 136 | { |
69212fc4 BVA |
137 | int ret; |
138 | ||
139 | #ifdef CONFIG_CLOCK_GETTIME | |
140 | #if defined(CONFIG_CLOCK_MONOTONIC) | |
141 | ret = clock_gettime(CLOCK_MONOTONIC, ts); | |
9ff1c070 | 142 | #else |
69212fc4 | 143 | ret = clock_gettime(CLOCK_REALTIME, ts); |
9ff1c070 | 144 | #endif |
69212fc4 BVA |
145 | #else |
146 | struct timeval tv; | |
147 | ||
148 | ret = gettimeofday(&tv, NULL); | |
149 | if (ret == 0) { | |
150 | ts->tv_sec = tv.tv_sec; | |
151 | ts->tv_nsec = tv.tv_usec * 1000; | |
152 | } | |
1e97cce9 | 153 | #endif |
69212fc4 BVA |
154 | assert(ret <= 0); |
155 | return ret; | |
156 | } | |
67bf9823 | 157 | |
8b6a404c | 158 | static void __fio_gettime(struct timespec *tp) |
02bcaa8c | 159 | { |
c223da83 | 160 | switch (fio_clock_source) { |
67bf9823 | 161 | #ifdef CONFIG_GETTIMEOFDAY |
8b6a404c VF |
162 | case CS_GTOD: { |
163 | struct timeval tv; | |
164 | gettimeofday(&tv, NULL); | |
165 | ||
166 | tp->tv_sec = tv.tv_sec; | |
167 | tp->tv_nsec = tv.tv_usec * 1000; | |
c223da83 | 168 | break; |
8b6a404c | 169 | } |
67bf9823 JA |
170 | #endif |
171 | #ifdef CONFIG_CLOCK_GETTIME | |
c223da83 | 172 | case CS_CGETTIME: { |
69212fc4 BVA |
173 | if (fio_get_mono_time(tp) < 0) { |
174 | log_err("fio: fio_get_mono_time() fails\n"); | |
c223da83 | 175 | assert(0); |
02bcaa8c | 176 | } |
c223da83 JA |
177 | break; |
178 | } | |
67bf9823 | 179 | #endif |
c223da83 JA |
180 | #ifdef ARCH_HAVE_CPU_CLOCK |
181 | case CS_CPUCLOCK: { | |
6d02b37b | 182 | uint64_t nsecs, t, multiples; |
03be65c9 JA |
183 | struct tv_valid *tv; |
184 | ||
185 | #ifdef CONFIG_TLS_THREAD | |
186 | tv = &static_tv_valid; | |
187 | #else | |
188 | tv = pthread_getspecific(tv_tls_key); | |
189 | #endif | |
c223da83 JA |
190 | |
191 | t = get_cpu_clock(); | |
96170421 | 192 | #ifdef ARCH_CPU_CLOCK_WRAPS |
73df3e07 JA |
193 | if (t < cycles_start && !cycles_wrap) |
194 | cycles_wrap = 1; | |
03be65c9 JA |
195 | else if (cycles_wrap && t >= cycles_start && !tv->warned) { |
196 | log_err("fio: double CPU clock wrap\n"); | |
197 | tv->warned = 1; | |
02dcf81c | 198 | } |
96170421 | 199 | #endif |
919e789d | 200 | #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
6d02b37b | 201 | nsecs = t / ARCH_CPU_CLOCK_CYCLES_PER_USEC * 1000; |
919e789d | 202 | #else |
6d02b37b VF |
203 | t -= cycles_start; |
204 | multiples = t >> max_cycles_shift; | |
205 | nsecs = multiples * nsecs_for_max_cycles; | |
206 | nsecs += ((t & max_cycles_mask) * clock_mult) >> clock_shift; | |
919e789d | 207 | #endif |
8b6a404c VF |
208 | tp->tv_sec = nsecs / 1000000000ULL; |
209 | tp->tv_nsec = nsecs % 1000000000ULL; | |
c223da83 JA |
210 | break; |
211 | } | |
212 | #endif | |
213 | default: | |
214 | log_err("fio: invalid clock source %d\n", fio_clock_source); | |
215 | break; | |
02bcaa8c | 216 | } |
67bf9823 JA |
217 | } |
218 | ||
219 | #ifdef FIO_DEBUG_TIME | |
8b6a404c | 220 | void fio_gettime(struct timespec *tp, void *caller) |
67bf9823 | 221 | #else |
8b6a404c | 222 | void fio_gettime(struct timespec *tp, void fio_unused *caller) |
67bf9823 JA |
223 | #endif |
224 | { | |
67bf9823 JA |
225 | #ifdef FIO_DEBUG_TIME |
226 | if (!caller) | |
227 | caller = __builtin_return_address(0); | |
228 | ||
229 | gtod_log_caller(caller); | |
230 | #endif | |
27325ed5 | 231 | if (fio_unlikely(fio_gettime_offload(tp))) |
67bf9823 | 232 | return; |
67bf9823 | 233 | |
9eb271b9 | 234 | __fio_gettime(tp); |
02bcaa8c | 235 | } |
be4ecfdf | 236 | |
919e789d | 237 | #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(ARCH_CPU_CLOCK_CYCLES_PER_USEC) |
2aebc5a1 | 238 | static unsigned long get_cycles_per_msec(void) |
c223da83 | 239 | { |
8b6a404c | 240 | struct timespec s, e; |
ba458c2f | 241 | uint64_t c_s, c_e; |
67bf9823 | 242 | enum fio_cs old_cs = fio_clock_source; |
99afcdb5 | 243 | uint64_t elapsed; |
c223da83 | 244 | |
67bf9823 JA |
245 | #ifdef CONFIG_CLOCK_GETTIME |
246 | fio_clock_source = CS_CGETTIME; | |
247 | #else | |
248 | fio_clock_source = CS_GTOD; | |
249 | #endif | |
250 | __fio_gettime(&s); | |
9ff1c070 | 251 | |
c223da83 JA |
252 | c_s = get_cpu_clock(); |
253 | do { | |
67bf9823 | 254 | __fio_gettime(&e); |
152529ae | 255 | c_e = get_cpu_clock(); |
9ff1c070 | 256 | |
a0318e17 VF |
257 | elapsed = ntime_since(&s, &e); |
258 | if (elapsed >= 1280000) | |
c223da83 | 259 | break; |
c223da83 JA |
260 | } while (1); |
261 | ||
67bf9823 | 262 | fio_clock_source = old_cs; |
a0318e17 | 263 | return (c_e - c_s) * 1000000 / elapsed; |
c223da83 JA |
264 | } |
265 | ||
fa80feae JA |
266 | #define NR_TIME_ITERS 50 |
267 | ||
e259879e | 268 | static int calibrate_cpu_clock(void) |
c223da83 JA |
269 | { |
270 | double delta, mean, S; | |
e51a6629 | 271 | uint64_t minc, maxc, avg, cycles[NR_TIME_ITERS]; |
6d02b37b VF |
272 | int i, samples, sft = 0; |
273 | unsigned long long tmp, max_ticks, max_mult; | |
c223da83 | 274 | |
2aebc5a1 | 275 | cycles[0] = get_cycles_per_msec(); |
c223da83 | 276 | S = delta = mean = 0.0; |
fa80feae | 277 | for (i = 0; i < NR_TIME_ITERS; i++) { |
2aebc5a1 | 278 | cycles[i] = get_cycles_per_msec(); |
c223da83 JA |
279 | delta = cycles[i] - mean; |
280 | if (delta) { | |
281 | mean += delta / (i + 1.0); | |
282 | S += delta * (cycles[i] - mean); | |
283 | } | |
284 | } | |
285 | ||
e259879e JA |
286 | /* |
287 | * The most common platform clock breakage is returning zero | |
288 | * indefinitely. Check for that and return failure. | |
289 | */ | |
290 | if (!cycles[0] && !cycles[NR_TIME_ITERS - 1]) | |
291 | return 1; | |
292 | ||
fa80feae | 293 | S = sqrt(S / (NR_TIME_ITERS - 1.0)); |
c223da83 | 294 | |
e51a6629 JA |
295 | minc = -1ULL; |
296 | maxc = samples = avg = 0; | |
fa80feae | 297 | for (i = 0; i < NR_TIME_ITERS; i++) { |
c223da83 JA |
298 | double this = cycles[i]; |
299 | ||
e51a6629 JA |
300 | minc = min(cycles[i], minc); |
301 | maxc = max(cycles[i], maxc); | |
302 | ||
03e20d68 | 303 | if ((fmax(this, mean) - fmin(this, mean)) > S) |
c223da83 JA |
304 | continue; |
305 | samples++; | |
306 | avg += this; | |
307 | } | |
308 | ||
fa80feae | 309 | S /= (double) NR_TIME_ITERS; |
c223da83 | 310 | |
fa80feae | 311 | for (i = 0; i < NR_TIME_ITERS; i++) |
13aa415a | 312 | dprint(FD_TIME, "cycles[%d]=%llu\n", i, (unsigned long long) cycles[i]); |
c223da83 | 313 | |
d7abad3d | 314 | avg /= samples; |
2aebc5a1 | 315 | cycles_per_msec = avg; |
a0318e17 | 316 | dprint(FD_TIME, "min=%llu, max=%llu, mean=%f, S=%f, N=%d\n", |
e51a6629 | 317 | (unsigned long long) minc, |
a0318e17 VF |
318 | (unsigned long long) maxc, mean, S, NR_TIME_ITERS); |
319 | dprint(FD_TIME, "trimmed mean=%llu, N=%d\n", (unsigned long long) avg, samples); | |
c223da83 | 320 | |
2aebc5a1 | 321 | max_ticks = MAX_CLOCK_SEC * cycles_per_msec * 1000ULL; |
74558486 JA |
322 | max_mult = ULLONG_MAX / max_ticks; |
323 | dprint(FD_TIME, "\n\nmax_ticks=%llu, __builtin_clzll=%d, " | |
324 | "max_mult=%llu\n", max_ticks, | |
325 | __builtin_clzll(max_ticks), max_mult); | |
6d02b37b VF |
326 | |
327 | /* | |
328 | * Find the largest shift count that will produce | |
329 | * a multiplier that does not exceed max_mult | |
330 | */ | |
2aebc5a1 | 331 | tmp = max_mult * cycles_per_msec / 1000000; |
6d02b37b VF |
332 | while (tmp > 1) { |
333 | tmp >>= 1; | |
334 | sft++; | |
335 | dprint(FD_TIME, "tmp=%llu, sft=%u\n", tmp, sft); | |
336 | } | |
337 | ||
74558486 JA |
338 | clock_shift = sft; |
339 | clock_mult = (1ULL << sft) * 1000000 / cycles_per_msec; | |
340 | dprint(FD_TIME, "clock_shift=%u, clock_mult=%llu\n", clock_shift, | |
341 | clock_mult); | |
6d02b37b | 342 | |
74558486 JA |
343 | /* |
344 | * Find the greatest power of 2 clock ticks that is less than the | |
345 | * ticks in MAX_CLOCK_SEC_2STAGE | |
346 | */ | |
6d02b37b | 347 | max_cycles_shift = max_cycles_mask = 0; |
2aebc5a1 | 348 | tmp = MAX_CLOCK_SEC * 1000ULL * cycles_per_msec; |
74558486 JA |
349 | dprint(FD_TIME, "tmp=%llu, max_cycles_shift=%u\n", tmp, |
350 | max_cycles_shift); | |
6d02b37b VF |
351 | while (tmp > 1) { |
352 | tmp >>= 1; | |
353 | max_cycles_shift++; | |
354 | dprint(FD_TIME, "tmp=%llu, max_cycles_shift=%u\n", tmp, max_cycles_shift); | |
355 | } | |
74558486 JA |
356 | /* |
357 | * if use use (1ULL << max_cycles_shift) * 1000 / cycles_per_msec | |
358 | * here we will have a discontinuity every | |
359 | * (1ULL << max_cycles_shift) cycles | |
360 | */ | |
361 | nsecs_for_max_cycles = ((1ULL << max_cycles_shift) * clock_mult) | |
362 | >> clock_shift; | |
6d02b37b | 363 | |
74558486 | 364 | /* Use a bitmask to calculate ticks % (1ULL << max_cycles_shift) */ |
6d02b37b VF |
365 | for (tmp = 0; tmp < max_cycles_shift; tmp++) |
366 | max_cycles_mask |= 1ULL << tmp; | |
367 | ||
74558486 JA |
368 | dprint(FD_TIME, "max_cycles_shift=%u, 2^max_cycles_shift=%llu, " |
369 | "nsecs_for_max_cycles=%llu, " | |
370 | "max_cycles_mask=%016llx\n", | |
371 | max_cycles_shift, (1ULL << max_cycles_shift), | |
372 | nsecs_for_max_cycles, max_cycles_mask); | |
6d02b37b | 373 | |
73df3e07 JA |
374 | cycles_start = get_cpu_clock(); |
375 | dprint(FD_TIME, "cycles_start=%llu\n", cycles_start); | |
e259879e | 376 | return 0; |
09a32402 JA |
377 | } |
378 | #else | |
e259879e | 379 | static int calibrate_cpu_clock(void) |
09a32402 | 380 | { |
919e789d CE |
381 | #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
382 | return 0; | |
383 | #else | |
e259879e | 384 | return 1; |
09a32402 | 385 | #endif |
919e789d CE |
386 | } |
387 | #endif // ARCH_HAVE_CPU_CLOCK | |
09a32402 | 388 | |
f1e3a7da | 389 | #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(CONFIG_TLS_THREAD) |
a0eba820 | 390 | void fio_local_clock_init(void) |
5d879392 JA |
391 | { |
392 | struct tv_valid *t; | |
393 | ||
572cfb3f | 394 | t = calloc(1, sizeof(*t)); |
9eb271b9 | 395 | if (pthread_setspecific(tv_tls_key, t)) { |
5d879392 | 396 | log_err("fio: can't set TLS key\n"); |
9eb271b9 JA |
397 | assert(0); |
398 | } | |
5d879392 JA |
399 | } |
400 | ||
401 | static void kill_tv_tls_key(void *data) | |
402 | { | |
403 | free(data); | |
404 | } | |
67bf9823 | 405 | #else |
a0eba820 | 406 | void fio_local_clock_init(void) |
67bf9823 JA |
407 | { |
408 | } | |
409 | #endif | |
5d879392 | 410 | |
09a32402 JA |
411 | void fio_clock_init(void) |
412 | { | |
01423eae JA |
413 | if (fio_clock_source == fio_clock_source_inited) |
414 | return; | |
415 | ||
f1e3a7da | 416 | #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(CONFIG_TLS_THREAD) |
5d879392 JA |
417 | if (pthread_key_create(&tv_tls_key, kill_tv_tls_key)) |
418 | log_err("fio: can't create TLS key\n"); | |
67bf9823 | 419 | #endif |
5d879392 | 420 | |
01423eae | 421 | fio_clock_source_inited = fio_clock_source; |
e259879e JA |
422 | |
423 | if (calibrate_cpu_clock()) | |
24575392 | 424 | tsc_reliable = false; |
fa80feae JA |
425 | |
426 | /* | |
427 | * If the arch sets tsc_reliable != 0, then it must be good enough | |
428 | * to use as THE clock source. For x86 CPUs, this means the TSC | |
429 | * runs at a constant rate and is synced across CPU cores. | |
430 | */ | |
431 | if (tsc_reliable) { | |
aad918e4 | 432 | if (!fio_clock_source_set && !fio_monotonic_clocktest(0)) |
fa80feae JA |
433 | fio_clock_source = CS_CPUCLOCK; |
434 | } else if (fio_clock_source == CS_CPUCLOCK) | |
435 | log_info("fio: clocksource=cpu may not be reliable\n"); | |
dae89ac9 | 436 | dprint(FD_TIME, "gettime: clocksource=%d\n", (int) fio_clock_source); |
c223da83 JA |
437 | } |
438 | ||
d6bb626e VF |
439 | uint64_t ntime_since(const struct timespec *s, const struct timespec *e) |
440 | { | |
441 | int64_t sec, nsec; | |
442 | ||
443 | sec = e->tv_sec - s->tv_sec; | |
444 | nsec = e->tv_nsec - s->tv_nsec; | |
445 | if (sec > 0 && nsec < 0) { | |
6d02b37b VF |
446 | sec--; |
447 | nsec += 1000000000LL; | |
d6bb626e VF |
448 | } |
449 | ||
450 | /* | |
6d02b37b VF |
451 | * time warp bug on some kernels? |
452 | */ | |
d6bb626e | 453 | if (sec < 0 || (sec == 0 && nsec < 0)) |
6d02b37b | 454 | return 0; |
d6bb626e VF |
455 | |
456 | return nsec + (sec * 1000000000LL); | |
457 | } | |
458 | ||
0410e783 JA |
459 | uint64_t ntime_since_now(const struct timespec *s) |
460 | { | |
461 | struct timespec now; | |
462 | ||
463 | fio_gettime(&now, NULL); | |
464 | return ntime_since(s, &now); | |
465 | } | |
466 | ||
8b6a404c | 467 | uint64_t utime_since(const struct timespec *s, const struct timespec *e) |
be4ecfdf | 468 | { |
90eff1c9 | 469 | int64_t sec, usec; |
39ab7da2 JA |
470 | |
471 | sec = e->tv_sec - s->tv_sec; | |
8b6a404c | 472 | usec = (e->tv_nsec - s->tv_nsec) / 1000; |
39ab7da2 JA |
473 | if (sec > 0 && usec < 0) { |
474 | sec--; | |
475 | usec += 1000000; | |
476 | } | |
477 | ||
478 | /* | |
479 | * time warp bug on some kernels? | |
480 | */ | |
481 | if (sec < 0 || (sec == 0 && usec < 0)) | |
482 | return 0; | |
483 | ||
20ac4e77 | 484 | return usec + (sec * 1000000); |
be4ecfdf JA |
485 | } |
486 | ||
8b6a404c | 487 | uint64_t utime_since_now(const struct timespec *s) |
be4ecfdf | 488 | { |
8b6a404c | 489 | struct timespec t; |
f52e9198 VF |
490 | #ifdef FIO_DEBUG_TIME |
491 | void *p = __builtin_return_address(0); | |
39ab7da2 | 492 | |
f52e9198 VF |
493 | fio_gettime(&t, p); |
494 | #else | |
39ab7da2 | 495 | fio_gettime(&t, NULL); |
f52e9198 VF |
496 | #endif |
497 | ||
39ab7da2 | 498 | return utime_since(s, &t); |
be4ecfdf | 499 | } |
783a3eb1 | 500 | |
8b6a404c | 501 | uint64_t mtime_since_tv(const struct timeval *s, const struct timeval *e) |
783a3eb1 | 502 | { |
8b6a404c | 503 | int64_t sec, usec; |
783a3eb1 | 504 | |
39ab7da2 | 505 | sec = e->tv_sec - s->tv_sec; |
8b6a404c | 506 | usec = (e->tv_usec - s->tv_usec); |
39ab7da2 JA |
507 | if (sec > 0 && usec < 0) { |
508 | sec--; | |
509 | usec += 1000000; | |
783a3eb1 JA |
510 | } |
511 | ||
39ab7da2 JA |
512 | if (sec < 0 || (sec == 0 && usec < 0)) |
513 | return 0; | |
514 | ||
be6bb2b7 Y |
515 | sec *= 1000; |
516 | usec /= 1000; | |
20ac4e77 | 517 | return sec + usec; |
783a3eb1 JA |
518 | } |
519 | ||
8b6a404c | 520 | uint64_t mtime_since_now(const struct timespec *s) |
783a3eb1 | 521 | { |
8b6a404c | 522 | struct timespec t; |
f52e9198 | 523 | #ifdef FIO_DEBUG_TIME |
39ab7da2 | 524 | void *p = __builtin_return_address(0); |
783a3eb1 | 525 | |
39ab7da2 | 526 | fio_gettime(&t, p); |
f52e9198 VF |
527 | #else |
528 | fio_gettime(&t, NULL); | |
529 | #endif | |
530 | ||
39ab7da2 JA |
531 | return mtime_since(s, &t); |
532 | } | |
783a3eb1 | 533 | |
8b6a404c VF |
534 | uint64_t mtime_since(const struct timespec *s, const struct timespec *e) |
535 | { | |
536 | int64_t sec, usec; | |
537 | ||
538 | sec = e->tv_sec - s->tv_sec; | |
539 | usec = (e->tv_nsec - s->tv_nsec) / 1000; | |
540 | if (sec > 0 && usec < 0) { | |
541 | sec--; | |
542 | usec += 1000000; | |
543 | } | |
544 | ||
545 | if (sec < 0 || (sec == 0 && usec < 0)) | |
546 | return 0; | |
547 | ||
548 | sec *= 1000; | |
549 | usec /= 1000; | |
550 | return sec + usec; | |
551 | } | |
552 | ||
553 | uint64_t time_since_now(const struct timespec *s) | |
39ab7da2 JA |
554 | { |
555 | return mtime_since_now(s) / 1000; | |
783a3eb1 | 556 | } |
7d11f871 | 557 | |
67bf9823 | 558 | #if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) && \ |
a250edd0 | 559 | defined(CONFIG_SYNC_SYNC) && defined(CONFIG_CMP_SWAP) |
7d11f871 | 560 | |
aad918e4 | 561 | #define CLOCK_ENTRIES_DEBUG 100000 |
5283741f | 562 | #define CLOCK_ENTRIES_TEST 1000 |
7d11f871 JA |
563 | |
564 | struct clock_entry { | |
58002f9a JA |
565 | uint32_t seq; |
566 | uint32_t cpu; | |
ba458c2f | 567 | uint64_t tsc; |
7d11f871 JA |
568 | }; |
569 | ||
570 | struct clock_thread { | |
571 | pthread_t thread; | |
572 | int cpu; | |
aad918e4 | 573 | int debug; |
17031c6d | 574 | struct fio_sem lock; |
aad918e4 | 575 | unsigned long nr_entries; |
58002f9a | 576 | uint32_t *seq; |
7d11f871 JA |
577 | struct clock_entry *entries; |
578 | }; | |
579 | ||
a250edd0 JA |
580 | static inline uint32_t atomic32_compare_and_swap(uint32_t *ptr, uint32_t old, |
581 | uint32_t new) | |
7d11f871 | 582 | { |
a250edd0 | 583 | return __sync_val_compare_and_swap(ptr, old, new); |
7d11f871 JA |
584 | } |
585 | ||
586 | static void *clock_thread_fn(void *data) | |
587 | { | |
588 | struct clock_thread *t = data; | |
589 | struct clock_entry *c; | |
590 | os_cpu_mask_t cpu_mask; | |
5896d827 | 591 | unsigned long long first; |
7d11f871 JA |
592 | int i; |
593 | ||
c763aea6 | 594 | if (fio_cpuset_init(&cpu_mask)) { |
37e20021 | 595 | int __err = errno; |
c763aea6 JA |
596 | |
597 | log_err("clock cpuset init failed: %s\n", strerror(__err)); | |
598 | goto err_out; | |
599 | } | |
600 | ||
7d11f871 JA |
601 | fio_cpu_set(&cpu_mask, t->cpu); |
602 | ||
603 | if (fio_setaffinity(gettid(), cpu_mask) == -1) { | |
e66d7f90 JA |
604 | int __err = errno; |
605 | ||
606 | log_err("clock setaffinity failed: %s\n", strerror(__err)); | |
c763aea6 | 607 | goto err; |
7d11f871 JA |
608 | } |
609 | ||
17031c6d | 610 | fio_sem_down(&t->lock); |
7d11f871 | 611 | |
5896d827 | 612 | first = get_cpu_clock(); |
7d11f871 | 613 | c = &t->entries[0]; |
aad918e4 | 614 | for (i = 0; i < t->nr_entries; i++, c++) { |
58002f9a JA |
615 | uint32_t seq; |
616 | uint64_t tsc; | |
7d11f871 JA |
617 | |
618 | c->cpu = t->cpu; | |
619 | do { | |
a250edd0 JA |
620 | seq = *t->seq; |
621 | if (seq == UINT_MAX) | |
58002f9a | 622 | break; |
a250edd0 | 623 | __sync_synchronize(); |
7d11f871 | 624 | tsc = get_cpu_clock(); |
a250edd0 JA |
625 | } while (seq != atomic32_compare_and_swap(t->seq, seq, seq + 1)); |
626 | ||
627 | if (seq == UINT_MAX) | |
628 | break; | |
7d11f871 JA |
629 | |
630 | c->seq = seq; | |
631 | c->tsc = tsc; | |
632 | } | |
633 | ||
aad918e4 JA |
634 | if (t->debug) { |
635 | unsigned long long clocks; | |
636 | ||
637 | clocks = t->entries[i - 1].tsc - t->entries[0].tsc; | |
5896d827 JA |
638 | log_info("cs: cpu%3d: %llu clocks seen, first %llu\n", t->cpu, |
639 | clocks, first); | |
aad918e4 | 640 | } |
58002f9a | 641 | |
e259879e JA |
642 | /* |
643 | * The most common platform clock breakage is returning zero | |
644 | * indefinitely. Check for that and return failure. | |
645 | */ | |
a250edd0 | 646 | if (i > 1 && !t->entries[i - 1].tsc && !t->entries[0].tsc) |
c763aea6 | 647 | goto err; |
e259879e | 648 | |
d47d7cb3 | 649 | fio_cpuset_exit(&cpu_mask); |
7d11f871 | 650 | return NULL; |
c763aea6 JA |
651 | err: |
652 | fio_cpuset_exit(&cpu_mask); | |
653 | err_out: | |
654 | return (void *) 1; | |
7d11f871 JA |
655 | } |
656 | ||
657 | static int clock_cmp(const void *p1, const void *p2) | |
658 | { | |
659 | const struct clock_entry *c1 = p1; | |
660 | const struct clock_entry *c2 = p2; | |
661 | ||
b9b3498e JA |
662 | if (c1->seq == c2->seq) |
663 | log_err("cs: bug in atomic sequence!\n"); | |
664 | ||
7d11f871 JA |
665 | return c1->seq - c2->seq; |
666 | } | |
667 | ||
aad918e4 | 668 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 669 | { |
8a1db9a1 | 670 | struct clock_thread *cthreads; |
7d11f871 JA |
671 | unsigned int nr_cpus = cpus_online(); |
672 | struct clock_entry *entries; | |
aad918e4 | 673 | unsigned long nr_entries, tentries, failed = 0; |
80da8a8f | 674 | struct clock_entry *prev, *this; |
58002f9a | 675 | uint32_t seq = 0; |
caa3eb1c | 676 | unsigned int i; |
7d11f871 | 677 | |
aad918e4 JA |
678 | if (debug) { |
679 | log_info("cs: reliable_tsc: %s\n", tsc_reliable ? "yes" : "no"); | |
d5e3f5d8 | 680 | |
b5b571a3 | 681 | #ifdef FIO_INC_DEBUG |
aad918e4 | 682 | fio_debug |= 1U << FD_TIME; |
b5b571a3 | 683 | #endif |
aad918e4 JA |
684 | nr_entries = CLOCK_ENTRIES_DEBUG; |
685 | } else | |
686 | nr_entries = CLOCK_ENTRIES_TEST; | |
687 | ||
4f1d43c2 | 688 | calibrate_cpu_clock(); |
aad918e4 JA |
689 | |
690 | if (debug) { | |
b5b571a3 | 691 | #ifdef FIO_INC_DEBUG |
aad918e4 | 692 | fio_debug &= ~(1U << FD_TIME); |
b5b571a3 | 693 | #endif |
aad918e4 | 694 | } |
4f1d43c2 | 695 | |
8a1db9a1 | 696 | cthreads = malloc(nr_cpus * sizeof(struct clock_thread)); |
aad918e4 | 697 | tentries = nr_entries * nr_cpus; |
7d11f871 JA |
698 | entries = malloc(tentries * sizeof(struct clock_entry)); |
699 | ||
aad918e4 JA |
700 | if (debug) |
701 | log_info("cs: Testing %u CPUs\n", nr_cpus); | |
7d11f871 JA |
702 | |
703 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 704 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
705 | |
706 | t->cpu = i; | |
aad918e4 | 707 | t->debug = debug; |
7d11f871 | 708 | t->seq = &seq; |
aad918e4 JA |
709 | t->nr_entries = nr_entries; |
710 | t->entries = &entries[i * nr_entries]; | |
17031c6d | 711 | __fio_sem_init(&t->lock, FIO_SEM_LOCKED); |
6b0110cd JA |
712 | if (pthread_create(&t->thread, NULL, clock_thread_fn, t)) { |
713 | failed++; | |
714 | nr_cpus = i; | |
715 | break; | |
716 | } | |
7d11f871 JA |
717 | } |
718 | ||
719 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 720 | struct clock_thread *t = &cthreads[i]; |
7d11f871 | 721 | |
17031c6d | 722 | fio_sem_up(&t->lock); |
7d11f871 JA |
723 | } |
724 | ||
814917be | 725 | for (i = 0; i < nr_cpus; i++) { |
8a1db9a1 | 726 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
727 | void *ret; |
728 | ||
729 | pthread_join(t->thread, &ret); | |
730 | if (ret) | |
731 | failed++; | |
17031c6d | 732 | __fio_sem_remove(&t->lock); |
7d11f871 | 733 | } |
8a1db9a1 | 734 | free(cthreads); |
7d11f871 JA |
735 | |
736 | if (failed) { | |
aad918e4 JA |
737 | if (debug) |
738 | log_err("Clocksource test: %lu threads failed\n", failed); | |
7d11f871 JA |
739 | goto err; |
740 | } | |
741 | ||
742 | qsort(entries, tentries, sizeof(struct clock_entry), clock_cmp); | |
743 | ||
a4aa3dc0 JA |
744 | /* silence silly gcc */ |
745 | prev = NULL; | |
7d11f871 | 746 | for (failed = i = 0; i < tentries; i++) { |
80da8a8f | 747 | this = &entries[i]; |
7d11f871 JA |
748 | |
749 | if (!i) { | |
750 | prev = this; | |
751 | continue; | |
752 | } | |
753 | ||
754 | if (prev->tsc > this->tsc) { | |
755 | uint64_t diff = prev->tsc - this->tsc; | |
756 | ||
aad918e4 JA |
757 | if (!debug) { |
758 | failed++; | |
759 | break; | |
760 | } | |
761 | ||
4e0a8fa2 JA |
762 | log_info("cs: CPU clock mismatch (diff=%llu):\n", |
763 | (unsigned long long) diff); | |
764 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", prev->cpu, (unsigned long long) prev->tsc, prev->seq); | |
765 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", this->cpu, (unsigned long long) this->tsc, this->seq); | |
7d11f871 JA |
766 | failed++; |
767 | } | |
768 | ||
769 | prev = this; | |
770 | } | |
771 | ||
aad918e4 JA |
772 | if (debug) { |
773 | if (failed) | |
774 | log_info("cs: Failed: %lu\n", failed); | |
775 | else | |
776 | log_info("cs: Pass!\n"); | |
777 | } | |
7d11f871 JA |
778 | err: |
779 | free(entries); | |
780 | return !!failed; | |
781 | } | |
782 | ||
783 | #else /* defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) */ | |
784 | ||
aad918e4 | 785 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 786 | { |
aad918e4 JA |
787 | if (debug) |
788 | log_info("cs: current platform does not support CPU clocks\n"); | |
789 | return 1; | |
7d11f871 JA |
790 | } |
791 | ||
792 | #endif |