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 | ||
67bf9823 | 130 | #ifdef CONFIG_CLOCK_GETTIME |
9ff1c070 JA |
131 | static int fill_clock_gettime(struct timespec *ts) |
132 | { | |
c544f604 SN |
133 | #if defined(CONFIG_CLOCK_MONOTONIC_RAW) |
134 | return clock_gettime(CLOCK_MONOTONIC_RAW, ts); | |
135 | #elif defined(CONFIG_CLOCK_MONOTONIC) | |
9ff1c070 JA |
136 | return clock_gettime(CLOCK_MONOTONIC, ts); |
137 | #else | |
138 | return clock_gettime(CLOCK_REALTIME, ts); | |
139 | #endif | |
140 | } | |
1e97cce9 | 141 | #endif |
67bf9823 | 142 | |
8b6a404c | 143 | static void __fio_gettime(struct timespec *tp) |
02bcaa8c | 144 | { |
c223da83 | 145 | switch (fio_clock_source) { |
67bf9823 | 146 | #ifdef CONFIG_GETTIMEOFDAY |
8b6a404c VF |
147 | case CS_GTOD: { |
148 | struct timeval tv; | |
149 | gettimeofday(&tv, NULL); | |
150 | ||
151 | tp->tv_sec = tv.tv_sec; | |
152 | tp->tv_nsec = tv.tv_usec * 1000; | |
c223da83 | 153 | break; |
8b6a404c | 154 | } |
67bf9823 JA |
155 | #endif |
156 | #ifdef CONFIG_CLOCK_GETTIME | |
c223da83 | 157 | case CS_CGETTIME: { |
8b6a404c | 158 | if (fill_clock_gettime(tp) < 0) { |
c223da83 JA |
159 | log_err("fio: clock_gettime fails\n"); |
160 | assert(0); | |
02bcaa8c | 161 | } |
c223da83 JA |
162 | break; |
163 | } | |
67bf9823 | 164 | #endif |
c223da83 JA |
165 | #ifdef ARCH_HAVE_CPU_CLOCK |
166 | case CS_CPUCLOCK: { | |
6d02b37b | 167 | uint64_t nsecs, t, multiples; |
03be65c9 JA |
168 | struct tv_valid *tv; |
169 | ||
170 | #ifdef CONFIG_TLS_THREAD | |
171 | tv = &static_tv_valid; | |
172 | #else | |
173 | tv = pthread_getspecific(tv_tls_key); | |
174 | #endif | |
c223da83 JA |
175 | |
176 | t = get_cpu_clock(); | |
96170421 | 177 | #ifdef ARCH_CPU_CLOCK_WRAPS |
73df3e07 JA |
178 | if (t < cycles_start && !cycles_wrap) |
179 | cycles_wrap = 1; | |
03be65c9 JA |
180 | else if (cycles_wrap && t >= cycles_start && !tv->warned) { |
181 | log_err("fio: double CPU clock wrap\n"); | |
182 | tv->warned = 1; | |
02dcf81c | 183 | } |
96170421 | 184 | #endif |
919e789d | 185 | #ifdef ARCH_CPU_CLOCK_CYCLES_PER_USEC |
6d02b37b | 186 | nsecs = t / ARCH_CPU_CLOCK_CYCLES_PER_USEC * 1000; |
919e789d | 187 | #else |
6d02b37b VF |
188 | t -= cycles_start; |
189 | multiples = t >> max_cycles_shift; | |
190 | nsecs = multiples * nsecs_for_max_cycles; | |
191 | nsecs += ((t & max_cycles_mask) * clock_mult) >> clock_shift; | |
919e789d | 192 | #endif |
8b6a404c VF |
193 | tp->tv_sec = nsecs / 1000000000ULL; |
194 | tp->tv_nsec = nsecs % 1000000000ULL; | |
c223da83 JA |
195 | break; |
196 | } | |
197 | #endif | |
198 | default: | |
199 | log_err("fio: invalid clock source %d\n", fio_clock_source); | |
200 | break; | |
02bcaa8c | 201 | } |
67bf9823 JA |
202 | } |
203 | ||
204 | #ifdef FIO_DEBUG_TIME | |
8b6a404c | 205 | void fio_gettime(struct timespec *tp, void *caller) |
67bf9823 | 206 | #else |
8b6a404c | 207 | void fio_gettime(struct timespec *tp, void fio_unused *caller) |
67bf9823 JA |
208 | #endif |
209 | { | |
67bf9823 JA |
210 | #ifdef FIO_DEBUG_TIME |
211 | if (!caller) | |
212 | caller = __builtin_return_address(0); | |
213 | ||
214 | gtod_log_caller(caller); | |
215 | #endif | |
27325ed5 | 216 | if (fio_unlikely(fio_gettime_offload(tp))) |
67bf9823 | 217 | return; |
67bf9823 | 218 | |
9eb271b9 | 219 | __fio_gettime(tp); |
02bcaa8c | 220 | } |
be4ecfdf | 221 | |
919e789d | 222 | #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(ARCH_CPU_CLOCK_CYCLES_PER_USEC) |
2aebc5a1 | 223 | static unsigned long get_cycles_per_msec(void) |
c223da83 | 224 | { |
8b6a404c | 225 | struct timespec s, e; |
ba458c2f | 226 | uint64_t c_s, c_e; |
67bf9823 | 227 | enum fio_cs old_cs = fio_clock_source; |
99afcdb5 | 228 | uint64_t elapsed; |
c223da83 | 229 | |
67bf9823 JA |
230 | #ifdef CONFIG_CLOCK_GETTIME |
231 | fio_clock_source = CS_CGETTIME; | |
232 | #else | |
233 | fio_clock_source = CS_GTOD; | |
234 | #endif | |
235 | __fio_gettime(&s); | |
9ff1c070 | 236 | |
c223da83 JA |
237 | c_s = get_cpu_clock(); |
238 | do { | |
67bf9823 | 239 | __fio_gettime(&e); |
152529ae | 240 | c_e = get_cpu_clock(); |
9ff1c070 | 241 | |
a0318e17 VF |
242 | elapsed = ntime_since(&s, &e); |
243 | if (elapsed >= 1280000) | |
c223da83 | 244 | break; |
c223da83 JA |
245 | } while (1); |
246 | ||
67bf9823 | 247 | fio_clock_source = old_cs; |
a0318e17 | 248 | return (c_e - c_s) * 1000000 / elapsed; |
c223da83 JA |
249 | } |
250 | ||
fa80feae JA |
251 | #define NR_TIME_ITERS 50 |
252 | ||
e259879e | 253 | static int calibrate_cpu_clock(void) |
c223da83 JA |
254 | { |
255 | double delta, mean, S; | |
e51a6629 | 256 | uint64_t minc, maxc, avg, cycles[NR_TIME_ITERS]; |
6d02b37b VF |
257 | int i, samples, sft = 0; |
258 | unsigned long long tmp, max_ticks, max_mult; | |
c223da83 | 259 | |
2aebc5a1 | 260 | cycles[0] = get_cycles_per_msec(); |
c223da83 | 261 | S = delta = mean = 0.0; |
fa80feae | 262 | for (i = 0; i < NR_TIME_ITERS; i++) { |
2aebc5a1 | 263 | cycles[i] = get_cycles_per_msec(); |
c223da83 JA |
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; |
c223da83 | 295 | |
fa80feae | 296 | for (i = 0; i < NR_TIME_ITERS; i++) |
13aa415a | 297 | dprint(FD_TIME, "cycles[%d]=%llu\n", i, (unsigned long long) cycles[i]); |
c223da83 | 298 | |
d7abad3d | 299 | avg /= samples; |
2aebc5a1 | 300 | cycles_per_msec = avg; |
a0318e17 | 301 | dprint(FD_TIME, "min=%llu, max=%llu, mean=%f, S=%f, N=%d\n", |
e51a6629 | 302 | (unsigned long long) minc, |
a0318e17 VF |
303 | (unsigned long long) maxc, mean, S, NR_TIME_ITERS); |
304 | dprint(FD_TIME, "trimmed mean=%llu, N=%d\n", (unsigned long long) avg, samples); | |
c223da83 | 305 | |
2aebc5a1 | 306 | max_ticks = MAX_CLOCK_SEC * cycles_per_msec * 1000ULL; |
74558486 JA |
307 | max_mult = ULLONG_MAX / max_ticks; |
308 | dprint(FD_TIME, "\n\nmax_ticks=%llu, __builtin_clzll=%d, " | |
309 | "max_mult=%llu\n", max_ticks, | |
310 | __builtin_clzll(max_ticks), max_mult); | |
6d02b37b VF |
311 | |
312 | /* | |
313 | * Find the largest shift count that will produce | |
314 | * a multiplier that does not exceed max_mult | |
315 | */ | |
2aebc5a1 | 316 | tmp = max_mult * cycles_per_msec / 1000000; |
6d02b37b VF |
317 | while (tmp > 1) { |
318 | tmp >>= 1; | |
319 | sft++; | |
320 | dprint(FD_TIME, "tmp=%llu, sft=%u\n", tmp, sft); | |
321 | } | |
322 | ||
74558486 JA |
323 | clock_shift = sft; |
324 | clock_mult = (1ULL << sft) * 1000000 / cycles_per_msec; | |
325 | dprint(FD_TIME, "clock_shift=%u, clock_mult=%llu\n", clock_shift, | |
326 | clock_mult); | |
6d02b37b | 327 | |
74558486 JA |
328 | /* |
329 | * Find the greatest power of 2 clock ticks that is less than the | |
330 | * ticks in MAX_CLOCK_SEC_2STAGE | |
331 | */ | |
6d02b37b | 332 | max_cycles_shift = max_cycles_mask = 0; |
2aebc5a1 | 333 | tmp = MAX_CLOCK_SEC * 1000ULL * cycles_per_msec; |
74558486 JA |
334 | dprint(FD_TIME, "tmp=%llu, max_cycles_shift=%u\n", tmp, |
335 | max_cycles_shift); | |
6d02b37b VF |
336 | while (tmp > 1) { |
337 | tmp >>= 1; | |
338 | max_cycles_shift++; | |
339 | dprint(FD_TIME, "tmp=%llu, max_cycles_shift=%u\n", tmp, max_cycles_shift); | |
340 | } | |
74558486 JA |
341 | /* |
342 | * if use use (1ULL << max_cycles_shift) * 1000 / cycles_per_msec | |
343 | * here we will have a discontinuity every | |
344 | * (1ULL << max_cycles_shift) cycles | |
345 | */ | |
346 | nsecs_for_max_cycles = ((1ULL << max_cycles_shift) * clock_mult) | |
347 | >> clock_shift; | |
6d02b37b | 348 | |
74558486 | 349 | /* Use a bitmask to calculate ticks % (1ULL << max_cycles_shift) */ |
6d02b37b VF |
350 | for (tmp = 0; tmp < max_cycles_shift; tmp++) |
351 | max_cycles_mask |= 1ULL << tmp; | |
352 | ||
74558486 JA |
353 | dprint(FD_TIME, "max_cycles_shift=%u, 2^max_cycles_shift=%llu, " |
354 | "nsecs_for_max_cycles=%llu, " | |
355 | "max_cycles_mask=%016llx\n", | |
356 | max_cycles_shift, (1ULL << max_cycles_shift), | |
357 | nsecs_for_max_cycles, max_cycles_mask); | |
6d02b37b | 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 | |
f1e3a7da | 374 | #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(CONFIG_TLS_THREAD) |
a0eba820 | 375 | void fio_local_clock_init(void) |
5d879392 JA |
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 | 390 | #else |
a0eba820 | 391 | void fio_local_clock_init(void) |
67bf9823 JA |
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 | ||
f1e3a7da | 401 | #if defined(ARCH_HAVE_CPU_CLOCK) && !defined(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()) | |
24575392 | 409 | tsc_reliable = false; |
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"); | |
dae89ac9 | 421 | dprint(FD_TIME, "gettime: clocksource=%d\n", (int) fio_clock_source); |
c223da83 JA |
422 | } |
423 | ||
d6bb626e VF |
424 | uint64_t ntime_since(const struct timespec *s, const struct timespec *e) |
425 | { | |
426 | int64_t sec, nsec; | |
427 | ||
428 | sec = e->tv_sec - s->tv_sec; | |
429 | nsec = e->tv_nsec - s->tv_nsec; | |
430 | if (sec > 0 && nsec < 0) { | |
6d02b37b VF |
431 | sec--; |
432 | nsec += 1000000000LL; | |
d6bb626e VF |
433 | } |
434 | ||
435 | /* | |
6d02b37b VF |
436 | * time warp bug on some kernels? |
437 | */ | |
d6bb626e | 438 | if (sec < 0 || (sec == 0 && nsec < 0)) |
6d02b37b | 439 | return 0; |
d6bb626e VF |
440 | |
441 | return nsec + (sec * 1000000000LL); | |
442 | } | |
443 | ||
0410e783 JA |
444 | uint64_t ntime_since_now(const struct timespec *s) |
445 | { | |
446 | struct timespec now; | |
447 | ||
448 | fio_gettime(&now, NULL); | |
449 | return ntime_since(s, &now); | |
450 | } | |
451 | ||
8b6a404c | 452 | uint64_t utime_since(const struct timespec *s, const struct timespec *e) |
be4ecfdf | 453 | { |
90eff1c9 | 454 | int64_t sec, usec; |
39ab7da2 JA |
455 | |
456 | sec = e->tv_sec - s->tv_sec; | |
8b6a404c | 457 | usec = (e->tv_nsec - s->tv_nsec) / 1000; |
39ab7da2 JA |
458 | if (sec > 0 && usec < 0) { |
459 | sec--; | |
460 | usec += 1000000; | |
461 | } | |
462 | ||
463 | /* | |
464 | * time warp bug on some kernels? | |
465 | */ | |
466 | if (sec < 0 || (sec == 0 && usec < 0)) | |
467 | return 0; | |
468 | ||
20ac4e77 | 469 | return usec + (sec * 1000000); |
be4ecfdf JA |
470 | } |
471 | ||
8b6a404c | 472 | uint64_t utime_since_now(const struct timespec *s) |
be4ecfdf | 473 | { |
8b6a404c | 474 | struct timespec t; |
f52e9198 VF |
475 | #ifdef FIO_DEBUG_TIME |
476 | void *p = __builtin_return_address(0); | |
39ab7da2 | 477 | |
f52e9198 VF |
478 | fio_gettime(&t, p); |
479 | #else | |
39ab7da2 | 480 | fio_gettime(&t, NULL); |
f52e9198 VF |
481 | #endif |
482 | ||
39ab7da2 | 483 | return utime_since(s, &t); |
be4ecfdf | 484 | } |
783a3eb1 | 485 | |
8b6a404c | 486 | uint64_t mtime_since_tv(const struct timeval *s, const struct timeval *e) |
783a3eb1 | 487 | { |
8b6a404c | 488 | int64_t sec, usec; |
783a3eb1 | 489 | |
39ab7da2 | 490 | sec = e->tv_sec - s->tv_sec; |
8b6a404c | 491 | usec = (e->tv_usec - s->tv_usec); |
39ab7da2 JA |
492 | if (sec > 0 && usec < 0) { |
493 | sec--; | |
494 | usec += 1000000; | |
783a3eb1 JA |
495 | } |
496 | ||
39ab7da2 JA |
497 | if (sec < 0 || (sec == 0 && usec < 0)) |
498 | return 0; | |
499 | ||
be6bb2b7 Y |
500 | sec *= 1000; |
501 | usec /= 1000; | |
20ac4e77 | 502 | return sec + usec; |
783a3eb1 JA |
503 | } |
504 | ||
8b6a404c | 505 | uint64_t mtime_since_now(const struct timespec *s) |
783a3eb1 | 506 | { |
8b6a404c | 507 | struct timespec t; |
f52e9198 | 508 | #ifdef FIO_DEBUG_TIME |
39ab7da2 | 509 | void *p = __builtin_return_address(0); |
783a3eb1 | 510 | |
39ab7da2 | 511 | fio_gettime(&t, p); |
f52e9198 VF |
512 | #else |
513 | fio_gettime(&t, NULL); | |
514 | #endif | |
515 | ||
39ab7da2 JA |
516 | return mtime_since(s, &t); |
517 | } | |
783a3eb1 | 518 | |
8b6a404c VF |
519 | uint64_t mtime_since(const struct timespec *s, const struct timespec *e) |
520 | { | |
521 | int64_t sec, usec; | |
522 | ||
523 | sec = e->tv_sec - s->tv_sec; | |
524 | usec = (e->tv_nsec - s->tv_nsec) / 1000; | |
525 | if (sec > 0 && usec < 0) { | |
526 | sec--; | |
527 | usec += 1000000; | |
528 | } | |
529 | ||
530 | if (sec < 0 || (sec == 0 && usec < 0)) | |
531 | return 0; | |
532 | ||
533 | sec *= 1000; | |
534 | usec /= 1000; | |
535 | return sec + usec; | |
536 | } | |
537 | ||
538 | uint64_t time_since_now(const struct timespec *s) | |
39ab7da2 JA |
539 | { |
540 | return mtime_since_now(s) / 1000; | |
783a3eb1 | 541 | } |
7d11f871 | 542 | |
67bf9823 | 543 | #if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) && \ |
a250edd0 | 544 | defined(CONFIG_SYNC_SYNC) && defined(CONFIG_CMP_SWAP) |
7d11f871 | 545 | |
aad918e4 | 546 | #define CLOCK_ENTRIES_DEBUG 100000 |
5283741f | 547 | #define CLOCK_ENTRIES_TEST 1000 |
7d11f871 JA |
548 | |
549 | struct clock_entry { | |
58002f9a JA |
550 | uint32_t seq; |
551 | uint32_t cpu; | |
ba458c2f | 552 | uint64_t tsc; |
7d11f871 JA |
553 | }; |
554 | ||
555 | struct clock_thread { | |
556 | pthread_t thread; | |
557 | int cpu; | |
aad918e4 | 558 | int debug; |
17031c6d | 559 | struct fio_sem lock; |
aad918e4 | 560 | unsigned long nr_entries; |
58002f9a | 561 | uint32_t *seq; |
7d11f871 JA |
562 | struct clock_entry *entries; |
563 | }; | |
564 | ||
a250edd0 JA |
565 | static inline uint32_t atomic32_compare_and_swap(uint32_t *ptr, uint32_t old, |
566 | uint32_t new) | |
7d11f871 | 567 | { |
a250edd0 | 568 | return __sync_val_compare_and_swap(ptr, old, new); |
7d11f871 JA |
569 | } |
570 | ||
571 | static void *clock_thread_fn(void *data) | |
572 | { | |
573 | struct clock_thread *t = data; | |
574 | struct clock_entry *c; | |
575 | os_cpu_mask_t cpu_mask; | |
5896d827 | 576 | unsigned long long first; |
7d11f871 JA |
577 | int i; |
578 | ||
c763aea6 | 579 | if (fio_cpuset_init(&cpu_mask)) { |
37e20021 | 580 | int __err = errno; |
c763aea6 JA |
581 | |
582 | log_err("clock cpuset init failed: %s\n", strerror(__err)); | |
583 | goto err_out; | |
584 | } | |
585 | ||
7d11f871 JA |
586 | fio_cpu_set(&cpu_mask, t->cpu); |
587 | ||
588 | if (fio_setaffinity(gettid(), cpu_mask) == -1) { | |
e66d7f90 JA |
589 | int __err = errno; |
590 | ||
591 | log_err("clock setaffinity failed: %s\n", strerror(__err)); | |
c763aea6 | 592 | goto err; |
7d11f871 JA |
593 | } |
594 | ||
17031c6d | 595 | fio_sem_down(&t->lock); |
7d11f871 | 596 | |
5896d827 | 597 | first = get_cpu_clock(); |
7d11f871 | 598 | c = &t->entries[0]; |
aad918e4 | 599 | for (i = 0; i < t->nr_entries; i++, c++) { |
58002f9a JA |
600 | uint32_t seq; |
601 | uint64_t tsc; | |
7d11f871 JA |
602 | |
603 | c->cpu = t->cpu; | |
604 | do { | |
a250edd0 JA |
605 | seq = *t->seq; |
606 | if (seq == UINT_MAX) | |
58002f9a | 607 | break; |
a250edd0 | 608 | __sync_synchronize(); |
7d11f871 | 609 | tsc = get_cpu_clock(); |
a250edd0 JA |
610 | } while (seq != atomic32_compare_and_swap(t->seq, seq, seq + 1)); |
611 | ||
612 | if (seq == UINT_MAX) | |
613 | break; | |
7d11f871 JA |
614 | |
615 | c->seq = seq; | |
616 | c->tsc = tsc; | |
617 | } | |
618 | ||
aad918e4 JA |
619 | if (t->debug) { |
620 | unsigned long long clocks; | |
621 | ||
622 | clocks = t->entries[i - 1].tsc - t->entries[0].tsc; | |
5896d827 JA |
623 | log_info("cs: cpu%3d: %llu clocks seen, first %llu\n", t->cpu, |
624 | clocks, first); | |
aad918e4 | 625 | } |
58002f9a | 626 | |
e259879e JA |
627 | /* |
628 | * The most common platform clock breakage is returning zero | |
629 | * indefinitely. Check for that and return failure. | |
630 | */ | |
a250edd0 | 631 | if (i > 1 && !t->entries[i - 1].tsc && !t->entries[0].tsc) |
c763aea6 | 632 | goto err; |
e259879e | 633 | |
d47d7cb3 | 634 | fio_cpuset_exit(&cpu_mask); |
7d11f871 | 635 | return NULL; |
c763aea6 JA |
636 | err: |
637 | fio_cpuset_exit(&cpu_mask); | |
638 | err_out: | |
639 | return (void *) 1; | |
7d11f871 JA |
640 | } |
641 | ||
642 | static int clock_cmp(const void *p1, const void *p2) | |
643 | { | |
644 | const struct clock_entry *c1 = p1; | |
645 | const struct clock_entry *c2 = p2; | |
646 | ||
b9b3498e JA |
647 | if (c1->seq == c2->seq) |
648 | log_err("cs: bug in atomic sequence!\n"); | |
649 | ||
7d11f871 JA |
650 | return c1->seq - c2->seq; |
651 | } | |
652 | ||
aad918e4 | 653 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 654 | { |
8a1db9a1 | 655 | struct clock_thread *cthreads; |
7d11f871 JA |
656 | unsigned int nr_cpus = cpus_online(); |
657 | struct clock_entry *entries; | |
aad918e4 | 658 | unsigned long nr_entries, tentries, failed = 0; |
80da8a8f | 659 | struct clock_entry *prev, *this; |
58002f9a | 660 | uint32_t seq = 0; |
caa3eb1c | 661 | unsigned int i; |
7d11f871 | 662 | |
aad918e4 JA |
663 | if (debug) { |
664 | log_info("cs: reliable_tsc: %s\n", tsc_reliable ? "yes" : "no"); | |
d5e3f5d8 | 665 | |
b5b571a3 | 666 | #ifdef FIO_INC_DEBUG |
aad918e4 | 667 | fio_debug |= 1U << FD_TIME; |
b5b571a3 | 668 | #endif |
aad918e4 JA |
669 | nr_entries = CLOCK_ENTRIES_DEBUG; |
670 | } else | |
671 | nr_entries = CLOCK_ENTRIES_TEST; | |
672 | ||
4f1d43c2 | 673 | calibrate_cpu_clock(); |
aad918e4 JA |
674 | |
675 | if (debug) { | |
b5b571a3 | 676 | #ifdef FIO_INC_DEBUG |
aad918e4 | 677 | fio_debug &= ~(1U << FD_TIME); |
b5b571a3 | 678 | #endif |
aad918e4 | 679 | } |
4f1d43c2 | 680 | |
8a1db9a1 | 681 | cthreads = malloc(nr_cpus * sizeof(struct clock_thread)); |
aad918e4 | 682 | tentries = nr_entries * nr_cpus; |
7d11f871 JA |
683 | entries = malloc(tentries * sizeof(struct clock_entry)); |
684 | ||
aad918e4 JA |
685 | if (debug) |
686 | log_info("cs: Testing %u CPUs\n", nr_cpus); | |
7d11f871 JA |
687 | |
688 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 689 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
690 | |
691 | t->cpu = i; | |
aad918e4 | 692 | t->debug = debug; |
7d11f871 | 693 | t->seq = &seq; |
aad918e4 JA |
694 | t->nr_entries = nr_entries; |
695 | t->entries = &entries[i * nr_entries]; | |
17031c6d | 696 | __fio_sem_init(&t->lock, FIO_SEM_LOCKED); |
6b0110cd JA |
697 | if (pthread_create(&t->thread, NULL, clock_thread_fn, t)) { |
698 | failed++; | |
699 | nr_cpus = i; | |
700 | break; | |
701 | } | |
7d11f871 JA |
702 | } |
703 | ||
704 | for (i = 0; i < nr_cpus; i++) { | |
8a1db9a1 | 705 | struct clock_thread *t = &cthreads[i]; |
7d11f871 | 706 | |
17031c6d | 707 | fio_sem_up(&t->lock); |
7d11f871 JA |
708 | } |
709 | ||
814917be | 710 | for (i = 0; i < nr_cpus; i++) { |
8a1db9a1 | 711 | struct clock_thread *t = &cthreads[i]; |
7d11f871 JA |
712 | void *ret; |
713 | ||
714 | pthread_join(t->thread, &ret); | |
715 | if (ret) | |
716 | failed++; | |
17031c6d | 717 | __fio_sem_remove(&t->lock); |
7d11f871 | 718 | } |
8a1db9a1 | 719 | free(cthreads); |
7d11f871 JA |
720 | |
721 | if (failed) { | |
aad918e4 JA |
722 | if (debug) |
723 | log_err("Clocksource test: %lu threads failed\n", failed); | |
7d11f871 JA |
724 | goto err; |
725 | } | |
726 | ||
727 | qsort(entries, tentries, sizeof(struct clock_entry), clock_cmp); | |
728 | ||
a4aa3dc0 JA |
729 | /* silence silly gcc */ |
730 | prev = NULL; | |
7d11f871 | 731 | for (failed = i = 0; i < tentries; i++) { |
80da8a8f | 732 | this = &entries[i]; |
7d11f871 JA |
733 | |
734 | if (!i) { | |
735 | prev = this; | |
736 | continue; | |
737 | } | |
738 | ||
739 | if (prev->tsc > this->tsc) { | |
740 | uint64_t diff = prev->tsc - this->tsc; | |
741 | ||
aad918e4 JA |
742 | if (!debug) { |
743 | failed++; | |
744 | break; | |
745 | } | |
746 | ||
4e0a8fa2 JA |
747 | log_info("cs: CPU clock mismatch (diff=%llu):\n", |
748 | (unsigned long long) diff); | |
749 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", prev->cpu, (unsigned long long) prev->tsc, prev->seq); | |
750 | log_info("\t CPU%3u: TSC=%llu, SEQ=%u\n", this->cpu, (unsigned long long) this->tsc, this->seq); | |
7d11f871 JA |
751 | failed++; |
752 | } | |
753 | ||
754 | prev = this; | |
755 | } | |
756 | ||
aad918e4 JA |
757 | if (debug) { |
758 | if (failed) | |
759 | log_info("cs: Failed: %lu\n", failed); | |
760 | else | |
761 | log_info("cs: Pass!\n"); | |
762 | } | |
7d11f871 JA |
763 | err: |
764 | free(entries); | |
765 | return !!failed; | |
766 | } | |
767 | ||
768 | #else /* defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) */ | |
769 | ||
aad918e4 | 770 | int fio_monotonic_clocktest(int debug) |
7d11f871 | 771 | { |
aad918e4 JA |
772 | if (debug) |
773 | log_info("cs: current platform does not support CPU clocks\n"); | |
774 | return 1; | |
7d11f871 JA |
775 | } |
776 | ||
777 | #endif |