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#include <time.h>
#include <sys/time.h>
#include "fio.h"
static struct timeval genesis;
static unsigned long ns_granularity;
unsigned long long utime_since(struct timeval *s, struct timeval *e)
{
long sec, usec;
unsigned long long ret;
sec = e->tv_sec - s->tv_sec;
usec = e->tv_usec - s->tv_usec;
if (sec > 0 && usec < 0) {
sec--;
usec += 1000000;
}
/*
* time warp bug on some kernels?
*/
if (sec < 0 || (sec == 0 && usec < 0))
return 0;
ret = sec * 1000000ULL + usec;
return ret;
}
unsigned long 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, ret;
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;
ret = sec + usec;
/*
* time warp bug on some kernels?
*/
if (ret < 0)
ret = 0;
return ret;
}
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_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);
}
unsigned long 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;
}
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));
}
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