boottrace
SYSCTL_NODE(_kern, OID_AUTO, boottrace, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
SYSCTL_PROC(_kern_boottrace, OID_AUTO, boottrace,
SYSINIT(boottrace, SI_SUB_CPU, SI_ORDER_ANY, boottrace_init, NULL);
(void)boottrace(tdname, __VA_ARGS__); \
int boottrace(const char *_tdname, const char *_eventfmt, ...)