[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
	1	#include <time.h>
	2	#include <sys/time.h>
	3
	4	#include "fio.h"
	5
	6	static struct timeval genesis;
	7	static unsigned long ns_granularity;
	8
	9	/*
	10	* busy looping version for the last few usec
	11	*/
	12	uint64_t usec_spin(unsigned int usec)
	13	{
	14	struct timeval start;
	15	uint64_t t;
	16
	17	fio_gettime(&start, NULL);
	18	while ((t = utime_since_now(&start)) < usec)
	19	nop;
	20
	21	return t;
	22	}
	23
	24	uint64_t usec_sleep(struct thread_data *td, unsigned long usec)
	25	{
	26	struct timespec req;
	27	struct timeval tv;
	28	uint64_t t = 0;
	29
	30	do {
	31	unsigned long ts = usec;
	32
	33	if (usec < ns_granularity) {
	34	t += usec_spin(usec);
	35	break;
	36	}
	37
	38	ts = usec - ns_granularity;
	39
	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)
	50	break;
	51
	52	ts = utime_since_now(&tv);
	53	t += ts;
	54	if (ts >= usec)
	55	break;
	56
	57	usec -= ts;
	58	} while (!td->terminate);
	59
	60	return t;
	61	}
	62
	63	uint64_t time_since_genesis(void)
	64	{
	65	return time_since_now(&genesis);
	66	}
	67
	68	uint64_t mtime_since_genesis(void)
	69	{
	70	return mtime_since_now(&genesis);
	71	}
	72
	73	uint64_t utime_since_genesis(void)
	74	{
	75	return utime_since_now(&genesis);
	76	}
	77
	78	int in_ramp_time(struct thread_data *td)
	79	{
	80	return td->o.ramp_time && !td->ramp_time_over;
	81	}
	82
	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
	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);
	103	if (utime_since(&td->epoch, &tv) >= td->o.ramp_time) {
	104	td->ramp_time_over = 1;
	105	reset_all_stats(td);
	106	td_set_runstate(td, TD_RAMP);
	107	parent_update_ramp(td);
	108	return 1;
	109	}
	110
	111	return 0;
	112	}
	113
	114	void fio_time_init(void)
	115	{
	116	int i;
	117
	118	fio_clock_init();
	119
	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	}
	138	}
	139
	140	void set_genesis_time(void)
	141	{
	142	fio_gettime(&genesis, NULL);
	143	}
	144
	145	void fill_start_time(struct timeval *t)
	146	{
	147	memcpy(t, &genesis, sizeof(genesis));
	148	}