[fio.git] / time.c

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

#include "fio.h"

static struct timeval genesis;
static unsigned long ns_granularity;

unsigned long utime_since(struct timeval *s, struct timeval *e)
{
	long 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 *= 1000000UL;

	return sec + usec;
}

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

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

unsigned long mtime_since(struct timeval *s, struct timeval *e)
{
	long 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 *= 1000UL;
	usec /= 1000UL;

	return sec + usec;
}

unsigned long mtime_since_now(struct timeval *s)
{
	struct timeval t;
	void *p = __builtin_return_address(0);

	fio_gettime(&t, p);
	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;

	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_sleep(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);
}

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

	if (!td->o.rate && !td->o.rate_iops)
		return;

	if (td_rw(td))
		bs = td->o.rw_min_bs;
	else if (td_read(td))
		bs = td->o.min_bs[DDIR_READ];
	else
		bs = td->o.min_bs[DDIR_WRITE];

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

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

		td->rate_pending_usleep += s;

		if (td->rate_pending_usleep >= 100000) {
			struct timeval t;

			fio_gettime(&t, NULL);
			usec_sleep(td, td->rate_pending_usleep);
			td->rate_pending_usleep -= utime_since_now(&t);
		}
	} else {
		long overtime = time_spent - usec_cycle;

		td->rate_pending_usleep -= overtime;
	}
}

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

static void fio_init time_init(void)
{
	int i;

	/*
	 * 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	unsigned long utime_since(struct timeval s, struct timeval e)
3c39a379 JA	10	{
1e97cce9	11	long sec, usec;
3c39a379 JA	12
	13	sec = e->tv_sec - s->tv_sec;
	14	usec = e->tv_usec - s->tv_usec;
	15	if (sec > 0 && usec < 0) {
	16	sec--;
	17	usec += 1000000;
	18	}
	19
64b18e12	20	sec *= 1000000UL;
3c39a379 JA	21
	22	return sec + usec;
	23	}
	24
69008999	25	unsigned long utime_since_now(struct timeval *s)
3c39a379 JA	26	{
	27	struct timeval t;
	28
02bcaa8c	29	fio_gettime(&t, NULL);
3c39a379 JA	30	return utime_since(s, &t);
	31	}
	32
	33	unsigned long mtime_since(struct timeval s, struct timeval e)
	34	{
1e97cce9	35	long sec, usec;
3c39a379 JA	36
	37	sec = e->tv_sec - s->tv_sec;
	38	usec = e->tv_usec - s->tv_usec;
	39	if (sec > 0 && usec < 0) {
	40	sec--;
	41	usec += 1000000;
	42	}
	43
64b18e12 JA	44	sec *= 1000UL;
64b18e12 JA	45	usec /= 1000UL;
3c39a379 JA	46
	47	return sec + usec;
	48	}
	49
	50	unsigned long mtime_since_now(struct timeval *s)
	51	{
	52	struct timeval t;
02bcaa8c	53	void *p = __builtin_return_address(0);
3c39a379	54
02bcaa8c	55	fio_gettime(&t, p);
3c39a379 JA	56	return mtime_since(s, &t);
	57	}
	58
	59	unsigned long time_since_now(struct timeval *s)
	60	{
	61	return mtime_since_now(s) / 1000;
	62	}
	63
	64	/*
	65	* busy looping version for the last few usec
	66	*/
b990b5c0	67	void __usec_sleep(unsigned int usec)
3c39a379 JA	68	{
	69	struct timeval start;
	70
02bcaa8c	71	fio_gettime(&start, NULL);
3c39a379 JA	72	while (utime_since_now(&start) < usec)
	73	nop;
	74	}
	75
	76	void usec_sleep(struct thread_data *td, unsigned long usec)
	77	{
fd841467 JA	78	struct timespec req;
fd841467 JA	79	struct timeval tv;
3c39a379 JA	80
3c39a379 JA	81	do {
fd841467 JA	82	unsigned long ts = usec;
	83
	84	if (usec < ns_granularity) {
3c39a379 JA	85	__usec_sleep(usec);
	86	break;
	87	}
	88
fd841467	89	ts = usec - ns_granularity;
3c39a379	90
fd841467 JA	91	if (ts >= 1000000) {
	92	req.tv_sec = ts / 1000000;
	93	ts -= 1000000 * req.tv_sec;
	94	} else
	95	req.tv_sec = 0;
	96
	97	req.tv_nsec = ts * 1000;
	98	fio_gettime(&tv, NULL);
	99
	100	if (nanosleep(&req, NULL) < 0)
3c39a379 JA	101	break;
3c39a379 JA	102
fd841467 JA	103	ts = utime_since_now(&tv);
	104	if (ts >= usec)
	105	break;
3c39a379	106
fd841467	107	usec -= ts;
3c39a379 JA	108	} while (!td->terminate);
	109	}
	110
	111	void rate_throttle(struct thread_data *td, unsigned long time_spent,
413dd459	112	unsigned int bytes)
3c39a379 JA	113	{
3c39a379 JA	114	unsigned long usec_cycle;
c3852ae2	115	unsigned int bs;
3c39a379	116
2dc1bbeb	117	if (!td->o.rate && !td->o.rate_iops)
3c39a379 JA	118	return;
3c39a379 JA	119
c3852ae2	120	if (td_rw(td))
2dc1bbeb	121	bs = td->o.rw_min_bs;
c3852ae2	122	else if (td_read(td))
2dc1bbeb	123	bs = td->o.min_bs[DDIR_READ];
c3852ae2	124	else
2dc1bbeb	125	bs = td->o.min_bs[DDIR_WRITE];
c3852ae2 JA	126
c3852ae2 JA	127	usec_cycle = td->rate_usec_cycle * (bytes / bs);
3c39a379 JA	128
	129	if (time_spent < usec_cycle) {
	130	unsigned long s = usec_cycle - time_spent;
	131
	132	td->rate_pending_usleep += s;
a998c869	133
3c39a379	134	if (td->rate_pending_usleep >= 100000) {
a998c869 JA	135	struct timeval t;
	136
	137	fio_gettime(&t, NULL);
3c39a379	138	usec_sleep(td, td->rate_pending_usleep);
a998c869	139	td->rate_pending_usleep -= utime_since_now(&t);
3c39a379 JA	140	}
	141	} else {
	142	long overtime = time_spent - usec_cycle;
	143
	144	td->rate_pending_usleep -= overtime;
	145	}
	146	}
263e529f JA	147
	148	unsigned long mtime_since_genesis(void)
	149	{
	150	return mtime_since_now(&genesis);
	151	}
	152
02bcaa8c	153	static void fio_init time_init(void)
263e529f	154	{
fd841467 JA	155	int i;
fd841467 JA	156
fd841467 JA	157	/*
	158	* Check the granularity of the nanosleep function
	159	*/
	160	for (i = 0; i < 10; i++) {
	161	struct timeval tv;
	162	struct timespec ts;
	163	unsigned long elapsed;
	164
	165	fio_gettime(&tv, NULL);
	166	ts.tv_sec = 0;
	167	ts.tv_nsec = 1000;
	168
	169	nanosleep(&ts, NULL);
	170	elapsed = utime_since_now(&tv);
	171
	172	if (elapsed > ns_granularity)
	173	ns_granularity = elapsed;
	174	}
263e529f	175	}
6043c579	176
a2f77c9f JA	177	void set_genesis_time(void)
	178	{
	179	fio_gettime(&genesis, NULL);
	180	}
	181
6043c579 JA	182	void fill_start_time(struct timeval *t)
	183	{
	184	memcpy(t, &genesis, sizeof(genesis));
	185	}