[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
 */
uint64_t usec_spin(unsigned int usec)
{
	struct timeval start;
	uint64_t t;

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

	return t;
}

uint64_t usec_sleep(struct thread_data *td, unsigned long usec)
{
	struct timespec req;
	struct timeval tv;
	uint64_t t = 0;

	do {
		unsigned long ts = usec;

		if (usec < ns_granularity) {
			t += 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);
		t += ts;
		if (ts >= usec)
			break;

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

	return t;
}

uint64_t time_since_genesis(void)
{
	return time_since_now(&genesis);
}

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;
}

static void parent_update_ramp(struct thread_data *td)
{
	struct thread_data *parent = td->parent;

	if (!parent || parent->ramp_time_over)
		return;

	reset_all_stats(parent);
	parent->ramp_time_over = 1;
	td_set_runstate(parent, TD_RAMP);
}

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);
		parent_update_ramp(td);
		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	*/
9cc80b6d	12	uint64_t usec_spin(unsigned int usec)
3c39a379 JA	13	{
3c39a379 JA	14	struct timeval start;
9cc80b6d	15	uint64_t t;
3c39a379	16
02bcaa8c	17	fio_gettime(&start, NULL);
9cc80b6d	18	while ((t = utime_since_now(&start)) < usec)
3c39a379	19	nop;
9cc80b6d JA	20
9cc80b6d JA	21	return t;
3c39a379 JA	22	}
3c39a379 JA	23
9cc80b6d	24	uint64_t usec_sleep(struct thread_data *td, unsigned long usec)
3c39a379	25	{
fd841467 JA	26	struct timespec req;
fd841467 JA	27	struct timeval tv;
9cc80b6d	28	uint64_t t = 0;
3c39a379 JA	29
3c39a379 JA	30	do {
fd841467 JA	31	unsigned long ts = usec;
	32
	33	if (usec < ns_granularity) {
9cc80b6d	34	t += usec_spin(usec);
3c39a379 JA	35	break;
	36	}
	37
fd841467	38	ts = usec - ns_granularity;
3c39a379	39
fd841467 JA	40	if (ts >= 1000000) {
	41	req.tv_sec = ts / 1000000;
	42	ts -= 1000000 * req.tv_sec;
	43	} else
	44	req.tv_sec = 0;
	45
	46	req.tv_nsec = ts * 1000;
	47	fio_gettime(&tv, NULL);
	48
	49	if (nanosleep(&req, NULL) < 0)
3c39a379 JA	50	break;
3c39a379 JA	51
fd841467	52	ts = utime_since_now(&tv);
9cc80b6d	53	t += ts;
fd841467 JA	54	if (ts >= usec)
fd841467 JA	55	break;
3c39a379	56
fd841467	57	usec -= ts;
3c39a379	58	} while (!td->terminate);
9cc80b6d JA	59
9cc80b6d JA	60	return t;
3c39a379 JA	61	}
3c39a379 JA	62
8b22c785 JA	63	uint64_t time_since_genesis(void)
	64	{
	65	return time_since_now(&genesis);
	66	}
	67
aa60bc58	68	uint64_t mtime_since_genesis(void)
263e529f JA	69	{
	70	return mtime_since_now(&genesis);
	71	}
	72
0de5b26f JA	73	uint64_t utime_since_genesis(void)
	74	{
	75	return utime_since_now(&genesis);
	76	}
	77
b29ee5b3 JA	78	int in_ramp_time(struct thread_data *td)
	79	{
	80	return td->o.ramp_time && !td->ramp_time_over;
	81	}
	82
ada8f235 JA	83	static void parent_update_ramp(struct thread_data *td)
	84	{
	85	struct thread_data *parent = td->parent;
	86
	87	if (!parent \|\| parent->ramp_time_over)
	88	return;
	89
	90	reset_all_stats(parent);
	91	parent->ramp_time_over = 1;
	92	td_set_runstate(parent, TD_RAMP);
	93	}
	94
721938ae JA	95	int ramp_time_over(struct thread_data *td)
	96	{
	97	struct timeval tv;
	98
	99	if (!td->o.ramp_time \|\| td->ramp_time_over)
	100	return 1;
	101
	102	fio_gettime(&tv, NULL);
0de5b26f	103	if (utime_since(&td->epoch, &tv) >= td->o.ramp_time) {
721938ae	104	td->ramp_time_over = 1;
b29ee5b3 JA	105	reset_all_stats(td);
b29ee5b3 JA	106	td_set_runstate(td, TD_RAMP);
ada8f235	107	parent_update_ramp(td);
721938ae JA	108	return 1;
	109	}
	110
	111	return 0;
	112	}
	113
03e20d68	114	void fio_time_init(void)
263e529f	115	{
fd841467 JA	116	int i;
fd841467 JA	117
c223da83 JA	118	fio_clock_init();
c223da83 JA	119
fd841467 JA	120	/*
	121	* Check the granularity of the nanosleep function
	122	*/
	123	for (i = 0; i < 10; i++) {
	124	struct timeval tv;
	125	struct timespec ts;
	126	unsigned long elapsed;
	127
	128	fio_gettime(&tv, NULL);
	129	ts.tv_sec = 0;
	130	ts.tv_nsec = 1000;
	131
	132	nanosleep(&ts, NULL);
	133	elapsed = utime_since_now(&tv);
	134
	135	if (elapsed > ns_granularity)
	136	ns_granularity = elapsed;
	137	}
263e529f	138	}
6043c579	139
a2f77c9f JA	140	void set_genesis_time(void)
	141	{
	142	fio_gettime(&genesis, NULL);
	143	}
	144
6043c579 JA	145	void fill_start_time(struct timeval *t)
	146	{
	147	memcpy(t, &genesis, sizeof(genesis));
	148	}