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Jens Axboe02bcaa82006-11-24 10:42:00 +01001/*
Jens Axboef5cc0242006-11-24 10:47:40 +01002 * Clock functions
Jens Axboe02bcaa82006-11-24 10:42:00 +01003 */
Jens Axboef5cc0242006-11-24 10:47:40 +01004
Jens Axboe02bcaa82006-11-24 10:42:00 +01005#include <unistd.h>
Jens Axboec223da82010-03-24 13:23:53 +01006#include <math.h>
Jens Axboe02bcaa82006-11-24 10:42:00 +01007#include <sys/time.h>
Bruce Cran03e20d62011-01-02 20:14:54 +01008#include <time.h>
Jens Axboe02bcaa82006-11-24 10:42:00 +01009
10#include "fio.h"
Jens Axboebe4ecfd2008-12-08 14:10:52 +010011#include "smalloc.h"
Jens Axboe02bcaa82006-11-24 10:42:00 +010012
13#include "hash.h"
Jens Axboe7d11f872012-12-17 12:03:29 +010014#include "os/os.h"
Jens Axboe02bcaa82006-11-24 10:42:00 +010015
Jens Axboe09a32402010-08-15 15:01:51 -040016#ifdef ARCH_HAVE_CPU_CLOCK
Jens Axboec223da82010-03-24 13:23:53 +010017static unsigned long cycles_per_usec;
Jens Axboe71339112012-12-21 22:54:56 +010018static unsigned long inv_cycles_per_usec;
Jens Axboe09a32402010-08-15 15:01:51 -040019#endif
Jens Axboe4de98eb2013-01-01 10:59:04 +010020int tsc_reliable = 0;
Jens Axboe5d879392012-12-18 09:12:27 +010021
22struct tv_valid {
23 struct timeval last_tv;
Jens Axboeba458c22013-01-21 05:38:22 -070024 uint64_t last_cycles;
Jens Axboe5d879392012-12-18 09:12:27 +010025 int last_tv_valid;
26};
Jens Axboe67bf9822013-01-10 11:23:19 +010027#ifdef CONFIG_TLS_THREAD
28static struct tv_valid __thread static_tv_valid;
29#else
Jens Axboe5d879392012-12-18 09:12:27 +010030static pthread_key_t tv_tls_key;
Jens Axboe67bf9822013-01-10 11:23:19 +010031#endif
Jens Axboe02bcaa82006-11-24 10:42:00 +010032
Bruce Cran16de1bf2012-02-20 17:07:32 +000033enum fio_cs fio_clock_source = FIO_PREFERRED_CLOCK_SOURCE;
Jens Axboefa80fea2012-12-09 20:29:00 +010034int fio_clock_source_set = 0;
Jens Axboe01423ea2012-12-14 20:37:06 +010035enum fio_cs fio_clock_source_inited = CS_INVAL;
Jens Axboec223da82010-03-24 13:23:53 +010036
Jens Axboe02bcaa82006-11-24 10:42:00 +010037#ifdef FIO_DEBUG_TIME
38
39#define HASH_BITS 8
40#define HASH_SIZE (1 << HASH_BITS)
41
Jens Axboe01743ee2008-06-02 12:19:19 +020042static struct flist_head hash[HASH_SIZE];
Jens Axboe02bcaa82006-11-24 10:42:00 +010043static int gtod_inited;
44
45struct gtod_log {
Jens Axboe01743ee2008-06-02 12:19:19 +020046 struct flist_head list;
Jens Axboe02bcaa82006-11-24 10:42:00 +010047 void *caller;
48 unsigned long calls;
49};
50
51static struct gtod_log *find_hash(void *caller)
52{
53 unsigned long h = hash_ptr(caller, HASH_BITS);
Jens Axboe01743ee2008-06-02 12:19:19 +020054 struct flist_head *entry;
Jens Axboe02bcaa82006-11-24 10:42:00 +010055
Jens Axboe01743ee2008-06-02 12:19:19 +020056 flist_for_each(entry, &hash[h]) {
57 struct gtod_log *log = flist_entry(entry, struct gtod_log,
58 list);
Jens Axboe02bcaa82006-11-24 10:42:00 +010059
60 if (log->caller == caller)
61 return log;
62 }
63
64 return NULL;
65}
66
67static struct gtod_log *find_log(void *caller)
68{
69 struct gtod_log *log = find_hash(caller);
70
71 if (!log) {
72 unsigned long h;
73
74 log = malloc(sizeof(*log));
Jens Axboe01743ee2008-06-02 12:19:19 +020075 INIT_FLIST_HEAD(&log->list);
Jens Axboe02bcaa82006-11-24 10:42:00 +010076 log->caller = caller;
77 log->calls = 0;
78
79 h = hash_ptr(caller, HASH_BITS);
Jens Axboe01743ee2008-06-02 12:19:19 +020080 flist_add_tail(&log->list, &hash[h]);
Jens Axboe02bcaa82006-11-24 10:42:00 +010081 }
82
83 return log;
84}
85
86static void gtod_log_caller(void *caller)
87{
88 if (gtod_inited) {
89 struct gtod_log *log = find_log(caller);
90
91 log->calls++;
92 }
93}
94
95static void fio_exit fio_dump_gtod(void)
96{
97 unsigned long total_calls = 0;
98 int i;
99
100 for (i = 0; i < HASH_SIZE; i++) {
Jens Axboe01743ee2008-06-02 12:19:19 +0200101 struct flist_head *entry;
Jens Axboe02bcaa82006-11-24 10:42:00 +0100102 struct gtod_log *log;
103
Jens Axboe01743ee2008-06-02 12:19:19 +0200104 flist_for_each(entry, &hash[i]) {
105 log = flist_entry(entry, struct gtod_log, list);
Jens Axboe02bcaa82006-11-24 10:42:00 +0100106
Jens Axboe5ec10ea2008-03-06 15:42:00 +0100107 printf("function %p, calls %lu\n", log->caller,
108 log->calls);
Jens Axboe02bcaa82006-11-24 10:42:00 +0100109 total_calls += log->calls;
110 }
111 }
112
113 printf("Total %lu gettimeofday\n", total_calls);
114}
115
116static void fio_init gtod_init(void)
117{
118 int i;
119
120 for (i = 0; i < HASH_SIZE; i++)
Jens Axboe01743ee2008-06-02 12:19:19 +0200121 INIT_FLIST_HEAD(&hash[i]);
Jens Axboe02bcaa82006-11-24 10:42:00 +0100122
123 gtod_inited = 1;
124}
125
126#endif /* FIO_DEBUG_TIME */
127
Jens Axboe67bf9822013-01-10 11:23:19 +0100128#ifdef CONFIG_CLOCK_GETTIME
Jens Axboe9ff1c072012-12-20 15:17:57 +0100129static int fill_clock_gettime(struct timespec *ts)
130{
Jens Axboe67bf9822013-01-10 11:23:19 +0100131#ifdef CONFIG_CLOCK_MONOTONIC
Jens Axboe9ff1c072012-12-20 15:17:57 +0100132 return clock_gettime(CLOCK_MONOTONIC, ts);
133#else
134 return clock_gettime(CLOCK_REALTIME, ts);
135#endif
136}
Jens Axboe1e97cce2006-12-05 11:44:16 +0100137#endif
Jens Axboe67bf9822013-01-10 11:23:19 +0100138
139static void *__fio_gettime(struct timeval *tp)
Jens Axboe02bcaa82006-11-24 10:42:00 +0100140{
Jens Axboe93f0b092012-12-18 09:41:59 +0100141 struct tv_valid *tv;
Jens Axboe5d879392012-12-18 09:12:27 +0100142
Jens Axboe67bf9822013-01-10 11:23:19 +0100143#ifdef CONFIG_TLS_THREAD
144 tv = &static_tv_valid;
145#else
Jens Axboe93f0b092012-12-18 09:41:59 +0100146 tv = pthread_getspecific(tv_tls_key);
Jens Axboe67bf9822013-01-10 11:23:19 +0100147#endif
Jens Axboe93f0b092012-12-18 09:41:59 +0100148
Jens Axboec223da82010-03-24 13:23:53 +0100149 switch (fio_clock_source) {
Jens Axboe67bf9822013-01-10 11:23:19 +0100150#ifdef CONFIG_GETTIMEOFDAY
Jens Axboec223da82010-03-24 13:23:53 +0100151 case CS_GTOD:
Jens Axboe02bcaa82006-11-24 10:42:00 +0100152 gettimeofday(tp, NULL);
Jens Axboec223da82010-03-24 13:23:53 +0100153 break;
Jens Axboe67bf9822013-01-10 11:23:19 +0100154#endif
155#ifdef CONFIG_CLOCK_GETTIME
Jens Axboec223da82010-03-24 13:23:53 +0100156 case CS_CGETTIME: {
Jens Axboe02bcaa82006-11-24 10:42:00 +0100157 struct timespec ts;
158
Jens Axboe9ff1c072012-12-20 15:17:57 +0100159 if (fill_clock_gettime(&ts) < 0) {
Jens Axboec223da82010-03-24 13:23:53 +0100160 log_err("fio: clock_gettime fails\n");
161 assert(0);
Jens Axboe02bcaa82006-11-24 10:42:00 +0100162 }
163
164 tp->tv_sec = ts.tv_sec;
165 tp->tv_usec = ts.tv_nsec / 1000;
Jens Axboec223da82010-03-24 13:23:53 +0100166 break;
167 }
Jens Axboe67bf9822013-01-10 11:23:19 +0100168#endif
Jens Axboec223da82010-03-24 13:23:53 +0100169#ifdef ARCH_HAVE_CPU_CLOCK
170 case CS_CPUCLOCK: {
Jens Axboeba458c22013-01-21 05:38:22 -0700171 uint64_t usecs, t;
Jens Axboec223da82010-03-24 13:23:53 +0100172
173 t = get_cpu_clock();
Jens Axboe93f0b092012-12-18 09:41:59 +0100174 if (tv && t < tv->last_cycles) {
Jens Axboec223da82010-03-24 13:23:53 +0100175 dprint(FD_TIME, "CPU clock going back in time\n");
Jens Axboe93f0b092012-12-18 09:41:59 +0100176 t = tv->last_cycles;
177 } else if (tv)
178 tv->last_cycles = t;
Jens Axboec223da82010-03-24 13:23:53 +0100179
Jens Axboe71339112012-12-21 22:54:56 +0100180 usecs = (t * inv_cycles_per_usec) / 16777216UL;
Jens Axboec223da82010-03-24 13:23:53 +0100181 tp->tv_sec = usecs / 1000000;
182 tp->tv_usec = usecs % 1000000;
Jens Axboec223da82010-03-24 13:23:53 +0100183 break;
184 }
185#endif
186 default:
187 log_err("fio: invalid clock source %d\n", fio_clock_source);
188 break;
Jens Axboe02bcaa82006-11-24 10:42:00 +0100189 }
Jens Axboe3e488922008-11-13 12:07:20 +0100190
Jens Axboe67bf9822013-01-10 11:23:19 +0100191 return tv;
192}
193
194#ifdef FIO_DEBUG_TIME
195void fio_gettime(struct timeval *tp, void *caller)
196#else
197void fio_gettime(struct timeval *tp, void fio_unused *caller)
198#endif
199{
200 struct tv_valid *tv;
201
202#ifdef FIO_DEBUG_TIME
203 if (!caller)
204 caller = __builtin_return_address(0);
205
206 gtod_log_caller(caller);
207#endif
208 if (fio_tv) {
209 memcpy(tp, fio_tv, sizeof(*tp));
210 return;
211 }
212
213 tv = __fio_gettime(tp);
214
Jens Axboe3e488922008-11-13 12:07:20 +0100215 /*
216 * If Linux is using the tsc clock on non-synced processors,
217 * sometimes time can appear to drift backwards. Fix that up.
218 */
Jens Axboe93f0b092012-12-18 09:41:59 +0100219 if (tv) {
220 if (tv->last_tv_valid) {
221 if (tp->tv_sec < tv->last_tv.tv_sec)
222 tp->tv_sec = tv->last_tv.tv_sec;
223 else if (tv->last_tv.tv_sec == tp->tv_sec &&
224 tp->tv_usec < tv->last_tv.tv_usec)
225 tp->tv_usec = tv->last_tv.tv_usec;
Jens Axboe5d879392012-12-18 09:12:27 +0100226 }
Jens Axboe93f0b092012-12-18 09:41:59 +0100227 tv->last_tv_valid = 1;
228 memcpy(&tv->last_tv, tp, sizeof(*tp));
Jens Axboe3e488922008-11-13 12:07:20 +0100229 }
Jens Axboe02bcaa82006-11-24 10:42:00 +0100230}
Jens Axboebe4ecfd2008-12-08 14:10:52 +0100231
Jens Axboe09a32402010-08-15 15:01:51 -0400232#ifdef ARCH_HAVE_CPU_CLOCK
Jens Axboec223da82010-03-24 13:23:53 +0100233static unsigned long get_cycles_per_usec(void)
234{
235 struct timeval s, e;
Jens Axboeba458c22013-01-21 05:38:22 -0700236 uint64_t c_s, c_e;
Jens Axboe67bf9822013-01-10 11:23:19 +0100237 enum fio_cs old_cs = fio_clock_source;
Jens Axboec223da82010-03-24 13:23:53 +0100238
Jens Axboe67bf9822013-01-10 11:23:19 +0100239#ifdef CONFIG_CLOCK_GETTIME
240 fio_clock_source = CS_CGETTIME;
241#else
242 fio_clock_source = CS_GTOD;
243#endif
244 __fio_gettime(&s);
Jens Axboe9ff1c072012-12-20 15:17:57 +0100245
Jens Axboec223da82010-03-24 13:23:53 +0100246 c_s = get_cpu_clock();
247 do {
Jens Axboeba458c22013-01-21 05:38:22 -0700248 uint64_t elapsed;
Jens Axboec223da82010-03-24 13:23:53 +0100249
Jens Axboe67bf9822013-01-10 11:23:19 +0100250 __fio_gettime(&e);
Jens Axboe9ff1c072012-12-20 15:17:57 +0100251
Jens Axboec223da82010-03-24 13:23:53 +0100252 elapsed = utime_since(&s, &e);
Jens Axboe486332e2012-12-10 08:07:14 +0100253 if (elapsed >= 1280) {
Jens Axboec223da82010-03-24 13:23:53 +0100254 c_e = get_cpu_clock();
255 break;
256 }
257 } while (1);
258
Jens Axboe67bf9822013-01-10 11:23:19 +0100259 fio_clock_source = old_cs;
Jens Axboec0110002012-12-10 08:29:03 +0100260 return (c_e - c_s + 127) >> 7;
Jens Axboec223da82010-03-24 13:23:53 +0100261}
262
Jens Axboefa80fea2012-12-09 20:29:00 +0100263#define NR_TIME_ITERS 50
264
Jens Axboee2598792013-02-24 21:29:35 +0100265static int calibrate_cpu_clock(void)
Jens Axboec223da82010-03-24 13:23:53 +0100266{
267 double delta, mean, S;
Jens Axboeba458c22013-01-21 05:38:22 -0700268 uint64_t avg, cycles[NR_TIME_ITERS];
Jens Axboec223da82010-03-24 13:23:53 +0100269 int i, samples;
270
Jens Axboec223da82010-03-24 13:23:53 +0100271 cycles[0] = get_cycles_per_usec();
272 S = delta = mean = 0.0;
Jens Axboefa80fea2012-12-09 20:29:00 +0100273 for (i = 0; i < NR_TIME_ITERS; i++) {
Jens Axboec223da82010-03-24 13:23:53 +0100274 cycles[i] = get_cycles_per_usec();
275 delta = cycles[i] - mean;
276 if (delta) {
277 mean += delta / (i + 1.0);
278 S += delta * (cycles[i] - mean);
279 }
280 }
281
Jens Axboee2598792013-02-24 21:29:35 +0100282 /*
283 * The most common platform clock breakage is returning zero
284 * indefinitely. Check for that and return failure.
285 */
286 if (!cycles[0] && !cycles[NR_TIME_ITERS - 1])
287 return 1;
288
Jens Axboefa80fea2012-12-09 20:29:00 +0100289 S = sqrt(S / (NR_TIME_ITERS - 1.0));
Jens Axboec223da82010-03-24 13:23:53 +0100290
291 samples = avg = 0;
Jens Axboefa80fea2012-12-09 20:29:00 +0100292 for (i = 0; i < NR_TIME_ITERS; i++) {
Jens Axboec223da82010-03-24 13:23:53 +0100293 double this = cycles[i];
294
Bruce Cran03e20d62011-01-02 20:14:54 +0100295 if ((fmax(this, mean) - fmin(this, mean)) > S)
Jens Axboec223da82010-03-24 13:23:53 +0100296 continue;
297 samples++;
298 avg += this;
299 }
300
Jens Axboefa80fea2012-12-09 20:29:00 +0100301 S /= (double) NR_TIME_ITERS;
Jens Axboe89db7272012-12-10 08:29:56 +0100302 mean /= 10.0;
Jens Axboec223da82010-03-24 13:23:53 +0100303
Jens Axboefa80fea2012-12-09 20:29:00 +0100304 for (i = 0; i < NR_TIME_ITERS; i++)
Jens Axboe4b91ee82013-02-25 10:18:33 +0100305 dprint(FD_TIME, "cycles[%d]=%llu\n", i,
306 (unsigned long long) cycles[i] / 10);
Jens Axboec223da82010-03-24 13:23:53 +0100307
Jens Axboed7abad32012-12-10 10:15:59 +0100308 avg /= samples;
Jens Axboeb0ff22d2013-01-01 13:38:18 +0100309 avg = (avg + 5) / 10;
Jens Axboe4b91ee82013-02-25 10:18:33 +0100310 dprint(FD_TIME, "avg: %llu\n", (unsigned long long) avg);
Jens Axboec223da82010-03-24 13:23:53 +0100311 dprint(FD_TIME, "mean=%f, S=%f\n", mean, S);
312
313 cycles_per_usec = avg;
Jens Axboe71339112012-12-21 22:54:56 +0100314 inv_cycles_per_usec = 16777216UL / cycles_per_usec;
315 dprint(FD_TIME, "inv_cycles_per_usec=%lu\n", inv_cycles_per_usec);
Jens Axboee2598792013-02-24 21:29:35 +0100316 return 0;
Jens Axboe09a32402010-08-15 15:01:51 -0400317}
318#else
Jens Axboee2598792013-02-24 21:29:35 +0100319static int calibrate_cpu_clock(void)
Jens Axboe09a32402010-08-15 15:01:51 -0400320{
Jens Axboee2598792013-02-24 21:29:35 +0100321 return 1;
Jens Axboe09a32402010-08-15 15:01:51 -0400322}
323#endif
324
Jens Axboe67bf9822013-01-10 11:23:19 +0100325#ifndef CONFIG_TLS_THREAD
Jens Axboe5d879392012-12-18 09:12:27 +0100326void fio_local_clock_init(int is_thread)
327{
328 struct tv_valid *t;
329
330 t = calloc(sizeof(*t), 1);
331 if (pthread_setspecific(tv_tls_key, t))
332 log_err("fio: can't set TLS key\n");
333}
334
335static void kill_tv_tls_key(void *data)
336{
337 free(data);
338}
Jens Axboe67bf9822013-01-10 11:23:19 +0100339#else
340void fio_local_clock_init(int is_thread)
341{
342}
343#endif
Jens Axboe5d879392012-12-18 09:12:27 +0100344
Jens Axboe09a32402010-08-15 15:01:51 -0400345void fio_clock_init(void)
346{
Jens Axboe01423ea2012-12-14 20:37:06 +0100347 if (fio_clock_source == fio_clock_source_inited)
348 return;
349
Jens Axboe67bf9822013-01-10 11:23:19 +0100350#ifndef CONFIG_TLS_THREAD
Jens Axboe5d879392012-12-18 09:12:27 +0100351 if (pthread_key_create(&tv_tls_key, kill_tv_tls_key))
352 log_err("fio: can't create TLS key\n");
Jens Axboe67bf9822013-01-10 11:23:19 +0100353#endif
Jens Axboe5d879392012-12-18 09:12:27 +0100354
Jens Axboe01423ea2012-12-14 20:37:06 +0100355 fio_clock_source_inited = fio_clock_source;
Jens Axboee2598792013-02-24 21:29:35 +0100356
357 if (calibrate_cpu_clock())
358 tsc_reliable = 0;
Jens Axboefa80fea2012-12-09 20:29:00 +0100359
360 /*
361 * If the arch sets tsc_reliable != 0, then it must be good enough
362 * to use as THE clock source. For x86 CPUs, this means the TSC
363 * runs at a constant rate and is synced across CPU cores.
364 */
365 if (tsc_reliable) {
366 if (!fio_clock_source_set)
367 fio_clock_source = CS_CPUCLOCK;
368 } else if (fio_clock_source == CS_CPUCLOCK)
369 log_info("fio: clocksource=cpu may not be reliable\n");
Jens Axboec223da82010-03-24 13:23:53 +0100370}
371
Jens Axboeaa60bc52013-01-04 13:24:52 +0100372uint64_t utime_since(struct timeval *s, struct timeval *e)
Jens Axboebe4ecfd2008-12-08 14:10:52 +0100373{
Jens Axboe39ab7da2012-11-06 22:10:43 +0100374 long sec, usec;
Jens Axboeaa60bc52013-01-04 13:24:52 +0100375 uint64_t ret;
Jens Axboebe4ecfd2008-12-08 14:10:52 +0100376
Jens Axboe39ab7da2012-11-06 22:10:43 +0100377 sec = e->tv_sec - s->tv_sec;
378 usec = e->tv_usec - s->tv_usec;
379 if (sec > 0 && usec < 0) {
380 sec--;
381 usec += 1000000;
382 }
Jens Axboe783a3eb2012-02-09 10:27:10 +0100383
384 /*
Jens Axboe39ab7da2012-11-06 22:10:43 +0100385 * time warp bug on some kernels?
Jens Axboe783a3eb2012-02-09 10:27:10 +0100386 */
Jens Axboe39ab7da2012-11-06 22:10:43 +0100387 if (sec < 0 || (sec == 0 && usec < 0))
388 return 0;
Jens Axboe783a3eb2012-02-09 10:27:10 +0100389
Jens Axboe39ab7da2012-11-06 22:10:43 +0100390 ret = sec * 1000000ULL + usec;
391
392 return ret;
Jens Axboe783a3eb2012-02-09 10:27:10 +0100393}
394
Jens Axboeaa60bc52013-01-04 13:24:52 +0100395uint64_t utime_since_now(struct timeval *s)
Jens Axboe783a3eb2012-02-09 10:27:10 +0100396{
Jens Axboe39ab7da2012-11-06 22:10:43 +0100397 struct timeval t;
Jens Axboe783a3eb2012-02-09 10:27:10 +0100398
Jens Axboe39ab7da2012-11-06 22:10:43 +0100399 fio_gettime(&t, NULL);
400 return utime_since(s, &t);
401}
Jens Axboe783a3eb2012-02-09 10:27:10 +0100402
Jens Axboeaa60bc52013-01-04 13:24:52 +0100403uint64_t mtime_since(struct timeval *s, struct timeval *e)
Jens Axboe39ab7da2012-11-06 22:10:43 +0100404{
405 long sec, usec, ret;
406
407 sec = e->tv_sec - s->tv_sec;
408 usec = e->tv_usec - s->tv_usec;
409 if (sec > 0 && usec < 0) {
410 sec--;
411 usec += 1000000;
Jens Axboe783a3eb2012-02-09 10:27:10 +0100412 }
413
Jens Axboe39ab7da2012-11-06 22:10:43 +0100414 if (sec < 0 || (sec == 0 && usec < 0))
415 return 0;
Jens Axboe783a3eb2012-02-09 10:27:10 +0100416
Jens Axboe39ab7da2012-11-06 22:10:43 +0100417 sec *= 1000UL;
418 usec /= 1000UL;
419 ret = sec + usec;
420
Jens Axboe783a3eb2012-02-09 10:27:10 +0100421 return ret;
422}
Jens Axboe39ab7da2012-11-06 22:10:43 +0100423
Jens Axboeaa60bc52013-01-04 13:24:52 +0100424uint64_t mtime_since_now(struct timeval *s)
Jens Axboe39ab7da2012-11-06 22:10:43 +0100425{
426 struct timeval t;
427 void *p = __builtin_return_address(0);
428
429 fio_gettime(&t, p);
430 return mtime_since(s, &t);
431}
432
Jens Axboeaa60bc52013-01-04 13:24:52 +0100433uint64_t time_since_now(struct timeval *s)
Jens Axboe39ab7da2012-11-06 22:10:43 +0100434{
435 return mtime_since_now(s) / 1000;
436}
Jens Axboe7d11f872012-12-17 12:03:29 +0100437
Jens Axboe67bf9822013-01-10 11:23:19 +0100438#if defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) && \
439 defined(CONFIG_SFAA)
Jens Axboe7d11f872012-12-17 12:03:29 +0100440
441#define CLOCK_ENTRIES 100000
442
443struct clock_entry {
Jens Axboe58002f92013-02-25 10:23:58 +0100444 uint32_t seq;
445 uint32_t cpu;
Jens Axboeba458c22013-01-21 05:38:22 -0700446 uint64_t tsc;
Jens Axboe7d11f872012-12-17 12:03:29 +0100447};
448
449struct clock_thread {
450 pthread_t thread;
451 int cpu;
452 pthread_mutex_t lock;
453 pthread_mutex_t started;
Jens Axboe58002f92013-02-25 10:23:58 +0100454 uint32_t *seq;
Jens Axboe7d11f872012-12-17 12:03:29 +0100455 struct clock_entry *entries;
456};
457
Jens Axboe58002f92013-02-25 10:23:58 +0100458static inline uint32_t atomic32_inc_return(uint32_t *seq)
Jens Axboe7d11f872012-12-17 12:03:29 +0100459{
460 return 1 + __sync_fetch_and_add(seq, 1);
461}
462
463static void *clock_thread_fn(void *data)
464{
465 struct clock_thread *t = data;
466 struct clock_entry *c;
467 os_cpu_mask_t cpu_mask;
Jens Axboe58002f92013-02-25 10:23:58 +0100468 uint32_t last_seq;
Jens Axboe7d11f872012-12-17 12:03:29 +0100469 int i;
470
471 memset(&cpu_mask, 0, sizeof(cpu_mask));
472 fio_cpu_set(&cpu_mask, t->cpu);
473
474 if (fio_setaffinity(gettid(), cpu_mask) == -1) {
475 log_err("clock setaffinity failed\n");
476 return (void *) 1;
477 }
478
Jens Axboe7d11f872012-12-17 12:03:29 +0100479 pthread_mutex_lock(&t->lock);
Jens Axboeb9b34982012-12-17 14:23:47 +0100480 pthread_mutex_unlock(&t->started);
Jens Axboe7d11f872012-12-17 12:03:29 +0100481
Jens Axboe58002f92013-02-25 10:23:58 +0100482 last_seq = 0;
Jens Axboe7d11f872012-12-17 12:03:29 +0100483 c = &t->entries[0];
484 for (i = 0; i < CLOCK_ENTRIES; i++, c++) {
Jens Axboe58002f92013-02-25 10:23:58 +0100485 uint32_t seq;
486 uint64_t tsc;
Jens Axboe7d11f872012-12-17 12:03:29 +0100487
488 c->cpu = t->cpu;
489 do {
Jens Axboe58002f92013-02-25 10:23:58 +0100490 seq = atomic32_inc_return(t->seq);
491 if (seq < last_seq)
492 break;
Jens Axboe7d11f872012-12-17 12:03:29 +0100493 tsc = get_cpu_clock();
494 } while (seq != *t->seq);
495
496 c->seq = seq;
497 c->tsc = tsc;
498 }
499
Jens Axboe0f78b222013-02-26 13:54:20 +0100500 log_info("cs: cpu%3d: %llu clocks seen\n", t->cpu,
501 (unsigned long long) t->entries[i - 1].tsc - t->entries[0].tsc);
Jens Axboe58002f92013-02-25 10:23:58 +0100502
Jens Axboee2598792013-02-24 21:29:35 +0100503 /*
504 * The most common platform clock breakage is returning zero
505 * indefinitely. Check for that and return failure.
506 */
Jens Axboe58002f92013-02-25 10:23:58 +0100507 if (!t->entries[i - 1].tsc && !t->entries[0].tsc)
Jens Axboee2598792013-02-24 21:29:35 +0100508 return (void *) 1;
509
Jens Axboe7d11f872012-12-17 12:03:29 +0100510 return NULL;
511}
512
513static int clock_cmp(const void *p1, const void *p2)
514{
515 const struct clock_entry *c1 = p1;
516 const struct clock_entry *c2 = p2;
517
Jens Axboeb9b34982012-12-17 14:23:47 +0100518 if (c1->seq == c2->seq)
519 log_err("cs: bug in atomic sequence!\n");
520
Jens Axboe7d11f872012-12-17 12:03:29 +0100521 return c1->seq - c2->seq;
522}
523
524int fio_monotonic_clocktest(void)
525{
526 struct clock_thread *threads;
527 unsigned int nr_cpus = cpus_online();
528 struct clock_entry *entries;
529 unsigned long tentries, failed;
Bruce Cran80da8a82013-02-21 14:16:17 +0100530 struct clock_entry *prev, *this;
Jens Axboe58002f92013-02-25 10:23:58 +0100531 uint32_t seq = 0;
Jens Axboe7d11f872012-12-17 12:03:29 +0100532 int i;
533
Jens Axboed5e3f5d2013-01-18 20:13:45 +0100534 log_info("cs: reliable_tsc: %s\n", tsc_reliable ? "yes" : "no");
535
Jens Axboe4f1d43c2012-12-17 14:29:28 +0100536 fio_debug |= 1U << FD_TIME;
537 calibrate_cpu_clock();
538 fio_debug &= ~(1U << FD_TIME);
539
Jens Axboe7d11f872012-12-17 12:03:29 +0100540 threads = malloc(nr_cpus * sizeof(struct clock_thread));
541 tentries = CLOCK_ENTRIES * nr_cpus;
542 entries = malloc(tentries * sizeof(struct clock_entry));
543
544 log_info("cs: Testing %u CPUs\n", nr_cpus);
545
546 for (i = 0; i < nr_cpus; i++) {
547 struct clock_thread *t = &threads[i];
548
549 t->cpu = i;
550 t->seq = &seq;
551 t->entries = &entries[i * CLOCK_ENTRIES];
552 pthread_mutex_init(&t->lock, NULL);
553 pthread_mutex_init(&t->started, NULL);
554 pthread_mutex_lock(&t->lock);
555 pthread_create(&t->thread, NULL, clock_thread_fn, t);
556 }
557
558 for (i = 0; i < nr_cpus; i++) {
559 struct clock_thread *t = &threads[i];
560
561 pthread_mutex_lock(&t->started);
562 }
563
564 for (i = 0; i < nr_cpus; i++) {
565 struct clock_thread *t = &threads[i];
566
567 pthread_mutex_unlock(&t->lock);
568 }
569
570 for (failed = i = 0; i < nr_cpus; i++) {
571 struct clock_thread *t = &threads[i];
572 void *ret;
573
574 pthread_join(t->thread, &ret);
575 if (ret)
576 failed++;
577 }
578 free(threads);
579
580 if (failed) {
581 log_err("Clocksource test: %u threads failed\n", failed);
582 goto err;
583 }
584
585 qsort(entries, tentries, sizeof(struct clock_entry), clock_cmp);
586
587 for (failed = i = 0; i < tentries; i++) {
Bruce Cran80da8a82013-02-21 14:16:17 +0100588 this = &entries[i];
Jens Axboe7d11f872012-12-17 12:03:29 +0100589
590 if (!i) {
591 prev = this;
592 continue;
593 }
594
595 if (prev->tsc > this->tsc) {
596 uint64_t diff = prev->tsc - this->tsc;
597
598 log_info("cs: CPU clock mismatch (diff=%lu):\n", diff);
599 log_info("\t CPU%3lu: TSC=%lu, SEQ=%lu\n", prev->cpu, prev->tsc, prev->seq);
600 log_info("\t CPU%3lu: TSC=%lu, SEQ=%lu\n", this->cpu, this->tsc, this->seq);
601 failed++;
602 }
603
604 prev = this;
605 }
606
607 if (failed)
608 log_info("cs: Failed: %lu\n", failed);
609 else
610 log_info("cs: Pass!\n");
611
612err:
613 free(entries);
614 return !!failed;
615}
616
617#else /* defined(FIO_HAVE_CPU_AFFINITY) && defined(ARCH_HAVE_CPU_CLOCK) */
618
619int fio_monotonic_clocktest(void)
620{
621 log_info("cs: current platform does not support CPU clocks\n");
622 return 0;
623}
624
625#endif