[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);
}

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_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
b29ee5b3 JA	61	int in_ramp_time(struct thread_data *td)
	62	{
	63	return td->o.ramp_time && !td->ramp_time_over;
	64	}
	65
721938ae JA	66	int ramp_time_over(struct thread_data *td)
	67	{
	68	struct timeval tv;
	69
	70	if (!td->o.ramp_time \|\| td->ramp_time_over)
	71	return 1;
	72
	73	fio_gettime(&tv, NULL);
	74	if (mtime_since(&td->epoch, &tv) >= td->o.ramp_time * 1000) {
	75	td->ramp_time_over = 1;
b29ee5b3 JA	76	reset_all_stats(td);
b29ee5b3 JA	77	td_set_runstate(td, TD_RAMP);
721938ae JA	78	return 1;
	79	}
	80
	81	return 0;
	82	}
	83
03e20d68	84	void fio_time_init(void)
263e529f	85	{
fd841467 JA	86	int i;
fd841467 JA	87
c223da83 JA	88	fio_clock_init();
c223da83 JA	89
fd841467 JA	90	/*
	91	* Check the granularity of the nanosleep function
	92	*/
	93	for (i = 0; i < 10; i++) {
	94	struct timeval tv;
	95	struct timespec ts;
	96	unsigned long elapsed;
	97
	98	fio_gettime(&tv, NULL);
	99	ts.tv_sec = 0;
	100	ts.tv_nsec = 1000;
	101
	102	nanosleep(&ts, NULL);
	103	elapsed = utime_since_now(&tv);
	104
	105	if (elapsed > ns_granularity)
	106	ns_granularity = elapsed;
	107	}
263e529f	108	}
6043c579	109
a2f77c9f JA	110	void set_genesis_time(void)
	111	{
	112	fio_gettime(&genesis, NULL);
	113	}
	114
6043c579 JA	115	void fill_start_time(struct timeval *t)
	116	{
	117	memcpy(t, &genesis, sizeof(genesis));
	118	}