[fio.git] / time.c

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

#include "fio.h"

static struct timeval genesis;
static unsigned long ns_granularity;

/*
 * 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);
}

uint64_t mtime_since_genesis(void)
{
	return mtime_since_now(&genesis);
}

uint64_t utime_since_genesis(void)
{
	return utime_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 (utime_since(&td->epoch, &tv) >= td->o.ramp_time) {
		td->ramp_time_over = 1;
		reset_all_stats(td);
		td_set_runstate(td, TD_RAMP);
		return 1;
	}

	return 0;
}

void 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);
}

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;
263e529f	8
3c39a379 JA	9	/*
	10	* busy looping version for the last few usec
	11	*/
6dd6f2cd	12	void usec_spin(unsigned int usec)
3c39a379 JA	13	{
	14	struct timeval start;
	15
02bcaa8c	16	fio_gettime(&start, NULL);
3c39a379 JA	17	while (utime_since_now(&start) < usec)
	18	nop;
	19	}
	20
	21	void usec_sleep(struct thread_data *td, unsigned long usec)
	22	{
fd841467 JA	23	struct timespec req;
fd841467 JA	24	struct timeval tv;
3c39a379 JA	25
3c39a379 JA	26	do {
fd841467 JA	27	unsigned long ts = usec;
	28
	29	if (usec < ns_granularity) {
6dd6f2cd	30	usec_spin(usec);
3c39a379 JA	31	break;
	32	}
	33
fd841467	34	ts = usec - ns_granularity;
3c39a379	35
fd841467 JA	36	if (ts >= 1000000) {
	37	req.tv_sec = ts / 1000000;
	38	ts -= 1000000 * req.tv_sec;
	39	} else
	40	req.tv_sec = 0;
	41
	42	req.tv_nsec = ts * 1000;
	43	fio_gettime(&tv, NULL);
	44
	45	if (nanosleep(&req, NULL) < 0)
3c39a379 JA	46	break;
3c39a379 JA	47
fd841467 JA	48	ts = utime_since_now(&tv);
	49	if (ts >= usec)
	50	break;
3c39a379	51
fd841467	52	usec -= ts;
3c39a379 JA	53	} while (!td->terminate);
	54	}
	55
aa60bc58	56	uint64_t mtime_since_genesis(void)
263e529f JA	57	{
	58	return mtime_since_now(&genesis);
	59	}
	60
0de5b26f JA	61	uint64_t utime_since_genesis(void)
	62	{
	63	return utime_since_now(&genesis);
	64	}
	65
b29ee5b3 JA	66	int in_ramp_time(struct thread_data *td)
	67	{
	68	return td->o.ramp_time && !td->ramp_time_over;
	69	}
	70
721938ae JA	71	int ramp_time_over(struct thread_data *td)
	72	{
	73	struct timeval tv;
	74
	75	if (!td->o.ramp_time \|\| td->ramp_time_over)
	76	return 1;
	77
	78	fio_gettime(&tv, NULL);
0de5b26f	79	if (utime_since(&td->epoch, &tv) >= td->o.ramp_time) {
721938ae	80	td->ramp_time_over = 1;
b29ee5b3 JA	81	reset_all_stats(td);
b29ee5b3 JA	82	td_set_runstate(td, TD_RAMP);
721938ae JA	83	return 1;
	84	}
	85
	86	return 0;
	87	}
	88
03e20d68	89	void fio_time_init(void)
263e529f	90	{
fd841467 JA	91	int i;
fd841467 JA	92
c223da83 JA	93	fio_clock_init();
c223da83 JA	94
fd841467 JA	95	/*
	96	* Check the granularity of the nanosleep function
	97	*/
	98	for (i = 0; i < 10; i++) {
	99	struct timeval tv;
	100	struct timespec ts;
	101	unsigned long elapsed;
	102
	103	fio_gettime(&tv, NULL);
	104	ts.tv_sec = 0;
	105	ts.tv_nsec = 1000;
	106
	107	nanosleep(&ts, NULL);
	108	elapsed = utime_since_now(&tv);
	109
	110	if (elapsed > ns_granularity)
	111	ns_granularity = elapsed;
	112	}
263e529f	113	}
6043c579	114
a2f77c9f JA	115	void set_genesis_time(void)
	116	{
	117	fio_gettime(&genesis, NULL);
	118	}
	119
6043c579 JA	120	void fill_start_time(struct timeval *t)
	121	{
	122	memcpy(t, &genesis, sizeof(genesis));
	123	}