[fio.git] / time.c

#include <time.h>
#include <sys/time.h>

#include "fio.h"

static struct timeval genesis;
static unsigned long ns_granularity;
unsigned long long genesis_cycles;

unsigned long long utime_since(struct timeval *s, struct timeval *e)
{
	long sec, usec;
	unsigned long long ret;

	sec = e->tv_sec - s->tv_sec;
	usec = e->tv_usec - s->tv_usec;
	if (sec > 0 && usec < 0) {
		sec--;
		usec += 1000000;
	}

	/*
	 * time warp bug on some kernels?
	 */
	if (sec < 0 || (sec == 0 && usec < 0))
		return 0;

	ret = sec * 1000000ULL + usec;

	return ret;
}

unsigned long long utime_since_now(struct timeval *s)
{
	struct timeval t;

	fio_gettime(&t, NULL);
	return utime_since(s, &t);
}

unsigned long mtime_since(struct timeval *s, struct timeval *e)
{
	long sec, usec, ret;

	sec = e->tv_sec - s->tv_sec;
	usec = e->tv_usec - s->tv_usec;
	if (sec > 0 && usec < 0) {
		sec--;
		usec += 1000000;
	}

	sec *= 1000UL;
	usec /= 1000UL;
	ret = sec + usec;

	/*
	 * time warp bug on some kernels?
	 */
	if (ret < 0)
		ret = 0;

	return ret;
}

unsigned long mtime_since_now(struct timeval *s)
{
	struct timeval t;
	void *p = __builtin_return_address(0);

	fio_gettime(&t, p);
	return mtime_since(s, &t);
}

unsigned long time_since_now(struct timeval *s)
{
	return mtime_since_now(s) / 1000;
}

/*
 * busy looping version for the last few usec
 */
void usec_spin(unsigned int usec)
{
	struct timeval start;

	fio_gettime(&start, NULL);
	while (utime_since_now(&start) < usec)
		nop;
}

void usec_sleep(struct thread_data *td, unsigned long usec)
{
	struct timespec req;
	struct timeval tv;

	do {
		unsigned long ts = usec;

		if (usec < ns_granularity) {
			usec_spin(usec);
			break;
		}

		ts = usec - ns_granularity;

		if (ts >= 1000000) {
			req.tv_sec = ts / 1000000;
			ts -= 1000000 * req.tv_sec;
		} else
			req.tv_sec = 0;

		req.tv_nsec = ts * 1000;
		fio_gettime(&tv, NULL);

		if (nanosleep(&req, NULL) < 0)
			break;

		ts = utime_since_now(&tv);
		if (ts >= usec)
			break;

		usec -= ts;
	} while (!td->terminate);
}

unsigned long mtime_since_genesis(void)
{
	return mtime_since_now(&genesis);
}

int in_ramp_time(struct thread_data *td)
{
	return td->o.ramp_time && !td->ramp_time_over;
}

int ramp_time_over(struct thread_data *td)
{
	struct timeval tv;

	if (!td->o.ramp_time || td->ramp_time_over)
		return 1;

	fio_gettime(&tv, NULL);
	if (mtime_since(&td->epoch, &tv) >= td->o.ramp_time * 1000) {
		td->ramp_time_over = 1;
		reset_all_stats(td);
		td_set_runstate(td, TD_RAMP);
		return 1;
	}

	return 0;
}

void fio_init fio_time_init(void)
{
	int i;

	fio_clock_init();

	/*
	 * Check the granularity of the nanosleep function
	 */
	for (i = 0; i < 10; i++) {
		struct timeval tv;
		struct timespec ts;
		unsigned long elapsed;

		fio_gettime(&tv, NULL);
		ts.tv_sec = 0;
		ts.tv_nsec = 1000;

		nanosleep(&ts, NULL);
		elapsed = utime_since_now(&tv);

		if (elapsed > ns_granularity)
			ns_granularity = elapsed;
	}
}

void set_genesis_time(void)
{
	fio_gettime(&genesis, NULL);
	genesis_cycles = get_cpu_clock();
}

void fill_start_time(struct timeval *t)
{
	memcpy(t, &genesis, sizeof(genesis));
}
Commit	Line	Data
3c39a379 JA	1	#include <time.h>
	2	#include <sys/time.h>
	3
	4	#include "fio.h"
	5
263e529f	6	static struct timeval genesis;
fd841467	7	static unsigned long ns_granularity;
c223da83	8	unsigned long long genesis_cycles;
263e529f	9
10927316	10	unsigned long long utime_since(struct timeval s, struct timeval e)
3c39a379	11	{
10927316 SL	12	long sec, usec;
10927316 SL	13	unsigned long long ret;
5ec10eaa	14
3c39a379 JA	15	sec = e->tv_sec - s->tv_sec;
	16	usec = e->tv_usec - s->tv_usec;
	17	if (sec > 0 && usec < 0) {
	18	sec--;
	19	usec += 1000000;
	20	}
	21
2bfe24bd JA	22	/*
	23	* time warp bug on some kernels?
	24	*/
10927316 SL	25	if (sec < 0 \|\| (sec == 0 && usec < 0))
10927316 SL	26	return 0;
5ec10eaa	27
10927316	28	ret = sec * 1000000ULL + usec;
5ec10eaa	29
2bfe24bd	30	return ret;
3c39a379 JA	31	}
3c39a379 JA	32
10927316	33	unsigned long long utime_since_now(struct timeval *s)
3c39a379 JA	34	{
	35	struct timeval t;
	36
02bcaa8c	37	fio_gettime(&t, NULL);
3c39a379 JA	38	return utime_since(s, &t);
	39	}
	40
	41	unsigned long mtime_since(struct timeval s, struct timeval e)
	42	{
2bfe24bd	43	long sec, usec, ret;
3c39a379 JA	44
	45	sec = e->tv_sec - s->tv_sec;
	46	usec = e->tv_usec - s->tv_usec;
	47	if (sec > 0 && usec < 0) {
	48	sec--;
	49	usec += 1000000;
	50	}
	51
64b18e12 JA	52	sec *= 1000UL;
64b18e12 JA	53	usec /= 1000UL;
2bfe24bd JA	54	ret = sec + usec;
	55
	56	/*
	57	* time warp bug on some kernels?
	58	*/
	59	if (ret < 0)
	60	ret = 0;
3c39a379	61
2bfe24bd	62	return ret;
3c39a379 JA	63	}
	64
	65	unsigned long mtime_since_now(struct timeval *s)
	66	{
	67	struct timeval t;
02bcaa8c	68	void *p = __builtin_return_address(0);
3c39a379	69
02bcaa8c	70	fio_gettime(&t, p);
3c39a379 JA	71	return mtime_since(s, &t);
	72	}
	73
	74	unsigned long time_since_now(struct timeval *s)
	75	{
	76	return mtime_since_now(s) / 1000;
	77	}
	78
	79	/*
	80	* busy looping version for the last few usec
	81	*/
6dd6f2cd	82	void usec_spin(unsigned int usec)
3c39a379 JA	83	{
	84	struct timeval start;
	85
02bcaa8c	86	fio_gettime(&start, NULL);
3c39a379 JA	87	while (utime_since_now(&start) < usec)
	88	nop;
	89	}
	90
	91	void usec_sleep(struct thread_data *td, unsigned long usec)
	92	{
fd841467 JA	93	struct timespec req;
fd841467 JA	94	struct timeval tv;
3c39a379 JA	95
3c39a379 JA	96	do {
fd841467 JA	97	unsigned long ts = usec;
	98
	99	if (usec < ns_granularity) {
6dd6f2cd	100	usec_spin(usec);
3c39a379 JA	101	break;
	102	}
	103
fd841467	104	ts = usec - ns_granularity;
3c39a379	105
fd841467 JA	106	if (ts >= 1000000) {
	107	req.tv_sec = ts / 1000000;
	108	ts -= 1000000 * req.tv_sec;
	109	} else
	110	req.tv_sec = 0;
	111
	112	req.tv_nsec = ts * 1000;
	113	fio_gettime(&tv, NULL);
	114
	115	if (nanosleep(&req, NULL) < 0)
3c39a379 JA	116	break;
3c39a379 JA	117
fd841467 JA	118	ts = utime_since_now(&tv);
	119	if (ts >= usec)
	120	break;
3c39a379	121
fd841467	122	usec -= ts;
3c39a379 JA	123	} while (!td->terminate);
	124	}
	125
263e529f JA	126	unsigned long mtime_since_genesis(void)
	127	{
	128	return mtime_since_now(&genesis);
	129	}
	130
b29ee5b3 JA	131	int in_ramp_time(struct thread_data *td)
	132	{
	133	return td->o.ramp_time && !td->ramp_time_over;
	134	}
	135
721938ae JA	136	int ramp_time_over(struct thread_data *td)
	137	{
	138	struct timeval tv;
	139
	140	if (!td->o.ramp_time \|\| td->ramp_time_over)
	141	return 1;
	142
	143	fio_gettime(&tv, NULL);
	144	if (mtime_since(&td->epoch, &tv) >= td->o.ramp_time * 1000) {
	145	td->ramp_time_over = 1;
b29ee5b3 JA	146	reset_all_stats(td);
b29ee5b3 JA	147	td_set_runstate(td, TD_RAMP);
721938ae JA	148	return 1;
	149	}
	150
	151	return 0;
	152	}
	153
c223da83	154	void fio_init fio_time_init(void)
263e529f	155	{
fd841467 JA	156	int i;
fd841467 JA	157
c223da83 JA	158	fio_clock_init();
c223da83 JA	159
fd841467 JA	160	/*
	161	* Check the granularity of the nanosleep function
	162	*/
	163	for (i = 0; i < 10; i++) {
	164	struct timeval tv;
	165	struct timespec ts;
	166	unsigned long elapsed;
	167
	168	fio_gettime(&tv, NULL);
	169	ts.tv_sec = 0;
	170	ts.tv_nsec = 1000;
	171
	172	nanosleep(&ts, NULL);
	173	elapsed = utime_since_now(&tv);
	174
	175	if (elapsed > ns_granularity)
	176	ns_granularity = elapsed;
	177	}
263e529f	178	}
6043c579	179
a2f77c9f JA	180	void set_genesis_time(void)
	181	{
	182	fio_gettime(&genesis, NULL);
c223da83	183	genesis_cycles = get_cpu_clock();
a2f77c9f JA	184	}
a2f77c9f JA	185
6043c579 JA	186	void fill_start_time(struct timeval *t)
	187	{
	188	memcpy(t, &genesis, sizeof(genesis));
	189	}