[fio.git] / time.c

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

#include "fio.h"

static struct timeval genesis;

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

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

	sec *= (double) 1000000;

	return sec + usec;
}

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

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

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

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

	sec *= (double) 1000;
	usec /= (double) 1000;

	return sec + usec;
}

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

	gettimeofday(&t, NULL);
	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_sleep(unsigned int usec)
{
	struct timeval start;

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

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

	req.tv_sec = usec / 1000000;
	req.tv_nsec = usec * 1000 - req.tv_sec * 1000000;

	do {
		if (usec < 5000) {
			__usec_sleep(usec);
			break;
		}

		rem.tv_sec = rem.tv_nsec = 0;
		if (nanosleep(&req, &rem) < 0)
			break;

		if ((rem.tv_sec + rem.tv_nsec) == 0)
			break;

		req.tv_nsec = rem.tv_nsec;
		req.tv_sec = rem.tv_sec;

		usec = rem.tv_sec * 1000000 + rem.tv_nsec / 1000;
	} while (!td->terminate);
}

void rate_throttle(struct thread_data *td, unsigned long time_spent,
		   unsigned int bytes)
{
	unsigned long usec_cycle;

	if (!td->rate)
		return;

	usec_cycle = td->rate_usec_cycle * (bytes / td->min_bs);

	if (time_spent < usec_cycle) {
		unsigned long s = usec_cycle - time_spent;

		td->rate_pending_usleep += s;
		if (td->rate_pending_usleep >= 100000) {
			usec_sleep(td, td->rate_pending_usleep);
			td->rate_pending_usleep = 0;
		}
	} else {
		long overtime = time_spent - usec_cycle;

		td->rate_pending_usleep -= overtime;
	}
}

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

void time_init(void)
{
	gettimeofday(&genesis, NULL);
}
Commit	Line	Data
3c39a379 JA	1	#include <time.h>
	2	#include <sys/time.h>
	3
	4	#include "fio.h"
	5
263e529f JA	6	static struct timeval genesis;
263e529f JA	7
3c39a379 JA	8	unsigned long utime_since(struct timeval s, struct timeval e)
	9	{
	10	double sec, usec;
	11
	12	sec = e->tv_sec - s->tv_sec;
	13	usec = e->tv_usec - s->tv_usec;
	14	if (sec > 0 && usec < 0) {
	15	sec--;
	16	usec += 1000000;
	17	}
	18
	19	sec *= (double) 1000000;
	20
	21	return sec + usec;
	22	}
	23
	24	static unsigned long utime_since_now(struct timeval *s)
	25	{
	26	struct timeval t;
	27
	28	gettimeofday(&t, NULL);
	29	return utime_since(s, &t);
	30	}
	31
	32	unsigned long mtime_since(struct timeval s, struct timeval e)
	33	{
	34	double sec, usec;
	35
	36	sec = e->tv_sec - s->tv_sec;
	37	usec = e->tv_usec - s->tv_usec;
	38	if (sec > 0 && usec < 0) {
	39	sec--;
	40	usec += 1000000;
	41	}
	42
	43	sec *= (double) 1000;
	44	usec /= (double) 1000;
	45
	46	return sec + usec;
	47	}
	48
	49	unsigned long mtime_since_now(struct timeval *s)
	50	{
	51	struct timeval t;
	52
	53	gettimeofday(&t, NULL);
	54	return mtime_since(s, &t);
	55	}
	56
	57	unsigned long time_since_now(struct timeval *s)
	58	{
	59	return mtime_since_now(s) / 1000;
	60	}
	61
	62	/*
	63	* busy looping version for the last few usec
	64	*/
b990b5c0	65	void __usec_sleep(unsigned int usec)
3c39a379 JA	66	{
	67	struct timeval start;
	68
	69	gettimeofday(&start, NULL);
	70	while (utime_since_now(&start) < usec)
	71	nop;
	72	}
	73
	74	void usec_sleep(struct thread_data *td, unsigned long usec)
	75	{
	76	struct timespec req, rem;
	77
	78	req.tv_sec = usec / 1000000;
	79	req.tv_nsec = usec * 1000 - req.tv_sec * 1000000;
	80
	81	do {
	82	if (usec < 5000) {
	83	__usec_sleep(usec);
	84	break;
	85	}
	86
	87	rem.tv_sec = rem.tv_nsec = 0;
	88	if (nanosleep(&req, &rem) < 0)
	89	break;
	90
	91	if ((rem.tv_sec + rem.tv_nsec) == 0)
	92	break;
	93
	94	req.tv_nsec = rem.tv_nsec;
	95	req.tv_sec = rem.tv_sec;
	96
	97	usec = rem.tv_sec * 1000000 + rem.tv_nsec / 1000;
	98	} while (!td->terminate);
	99	}
	100
	101	void rate_throttle(struct thread_data *td, unsigned long time_spent,
	102	unsigned int bytes)
	103	{
	104	unsigned long usec_cycle;
	105
	106	if (!td->rate)
	107	return;
	108
	109	usec_cycle = td->rate_usec_cycle * (bytes / td->min_bs);
	110
	111	if (time_spent < usec_cycle) {
	112	unsigned long s = usec_cycle - time_spent;
	113
	114	td->rate_pending_usleep += s;
	115	if (td->rate_pending_usleep >= 100000) {
	116	usec_sleep(td, td->rate_pending_usleep);
	117	td->rate_pending_usleep = 0;
	118	}
	119	} else {
	120	long overtime = time_spent - usec_cycle;
	121
	122	td->rate_pending_usleep -= overtime;
	123	}
	124	}
263e529f JA	125
	126	unsigned long mtime_since_genesis(void)
	127	{
	128	return mtime_since_now(&genesis);
	129	}
	130
	131	void time_init(void)
	132	{
	133	gettimeofday(&genesis, NULL);
	134	}