KTR_SYSC
KTR_STOP4(KTR_SYSC, "syscall", syscallname(p, sa->code),
KTR_START4(KTR_SYSC, "syscall", syscallname(p, sa->code),
CTR3(KTR_SYSC, "ast: thread %p (pid %d, %s)", td,
CTR3(KTR_SYSC, "userret: thread %p (pid %d, %s)", td, p->p_pid,