In dt(4) add an offset of 100000 to the thread ID. This also happens

in other places where the TID is copied from kernel to userland.
So in btrace(8) the filter and action tid variable has the same
value as ps(1) output.
OK anton@ mpi@

sys/dev/dt/dt_dev.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: dt_dev.c,v 1.13 2021/04/23 07:21:02 bluhm Exp $ */
+/*	$OpenBSD: dt_dev.c,v 1.14 2021/05/22 21:25:38 bluhm Exp $ */
 
 /*
  * Copyright (c) 2019 Martin Pieuchot <[email protected]>
@@ -565,7 +565,7 @@ dt_pcb_filter(struct dt_pcb *dp)
 		var = p->p_p->ps_pid;
 		break;
 	case DT_FV_TID:
-		var = p->p_tid;
+		var = p->p_tid + THREAD_PID_OFFSET;
 		break;
 	case DT_FV_NONE:
 		break;
@@ -621,7 +621,7 @@ dt_pcb_ring_get(struct dt_pcb *dp, int profiling)
 	dtev->dtev_pbn = dp->dp_dtp->dtp_pbn;
 	dtev->dtev_cpu = cpu_number();
 	dtev->dtev_pid = p->p_p->ps_pid;
-	dtev->dtev_tid = p->p_tid;
+	dtev->dtev_tid = p->p_tid + THREAD_PID_OFFSET;
 	nanotime(&dtev->dtev_tsp);
 
 	if (ISSET(dp->dp_evtflags, DTEVT_EXECNAME))