Function lockstat_nsecs

freebsd/kern/kern_lockstat.c:77–92

volatile bool __read_frequently lockstat_enabled;

uint64_t 
lockstat_nsecs(struct lock_object *lo)
{
	struct bintime bt;
	uint64_t ns;

	if (!lockstat_enabled)
		return (0);
	if ((lo->lo_flags & LO_NOPROFILE) != 0)
		return (0);

	binuptime(&bt);
	ns = bt.sec * (uint64_t)1000000000;
	ns += ((uint64_t)1000000000 * (uint32_t)(bt.frac >> 32)) >> 32;
	return (ns);
}