kinst: Add a rudimentary regression test case

The test instruments a number of large, frequently called kernel
functions while generating load in the background.

MFC after:	3 months

cddl/contrib/opensolaris/cmd/dtrace/test/tst/amd64/kinst/tst.basic.ksh

@@ -0,0 +1,46 @@
+#!/usr/bin/ksh
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright (c) 2022 Mark Johnston <markj@FreeBSD.org>
+#
+
+script()
+{
+	$dtrace -q -s /dev/stdin <<__EOF__
+kinst::vm_fault: {}
+kinst::amd64_syscall: {}
+kinst::exit1: {}
+
+tick-10s {exit(0);}
+__EOF__
+}
+
+spin()
+{
+	while true; do
+		ls -la / >/dev/null 2>&1
+	done
+}
+
+if [ $# != 1 ]; then
+	echo expected one argument: '<'dtrace-path'>'
+	exit 2
+fi
+
+dtrace=$1
+
+spin &
+child=$!
+
+script
+exit $?

cddl/usr.sbin/dtrace/tests/amd64/Makefile

@@ -1,7 +1,8 @@
 # $FreeBSD$
 
 TESTSDIR=	${TESTSBASE}/cddl/usr.sbin/dtrace/amd64
-TESTS_SUBDIRS+= arrays
+TESTS_SUBDIRS+= arrays \
+		kinst
 
 .PATH:		${.CURDIR:H:H:H:H:H}/tests
 KYUAFILE=	YES

cddl/usr.sbin/dtrace/tests/amd64/kinst/Makefile

@@ -0,0 +1,19 @@
+# $FreeBSD$
+
+#
+# This Makefile was generated by $srcdir/cddl/usr.sbin/dtrace/tests/tools/genmakefiles.sh.
+#
+
+PACKAGE=	tests
+
+${PACKAGE}FILES= \
+     tst.basic.ksh  \
+
+TESTEXES= \
+
+
+CFILES= \
+
+
+
+.include "../../dtrace.test.mk"

etc/mtree/BSD.tests.dist

@@ -253,6 +253,8 @@
                 amd64
                     arrays
                     ..
+                    kinst
+                    ..
                 ..
             ..
             zfsd