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time.c
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time.c
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#include <time.h>
#include <sys/time.h>
#include "fio.h"
static struct timeval genesis;
static unsigned long ns_granularity;
void timeval_add_msec(struct timeval *tv, unsigned int msec)
{
tv->tv_usec += 1000 * msec;
if (tv->tv_usec >= 1000000) {
tv->tv_usec -= 1000000;
tv->tv_sec++;
}
}
/*
* 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));
}