selftests/mm: dump a summary in run_vmtests.sh

Dump a summary after running whatever test specified.  Useful for human
runners to identify any kind of failures (besides exit code).

Link: https://lkml.kernel.org/r/20230412164117.327720-1-peterx@redhat.comSigned-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

tools/testing/selftests/mm/run_vmtests.sh

@@ -5,6 +5,9 @@
 # Kselftest framework requirement - SKIP code is 4.
 ksft_skip=4
 
+count_pass=0
+count_fail=0
+count_skip=0
 exitcode=0
 
 usage() {
@@ -149,11 +152,14 @@ run_test() {
 		"$@"
 		local ret=$?
 		if [ $ret -eq 0 ]; then
+			count_pass=$(( count_pass + 1 ))
 			echo "[PASS]"
 		elif [ $ret -eq $ksft_skip ]; then
+			count_skip=$(( count_skip + 1 ))
 			echo "[SKIP]"
 			exitcode=$ksft_skip
 		else
+			count_fail=$(( count_fail + 1 ))
 			echo "[FAIL]"
 			exitcode=1
 		fi
@@ -279,4 +285,6 @@ CATEGORY="soft_dirty" run_test ./soft-dirty
 # COW tests
 CATEGORY="cow" run_test ./cow
 
+echo "SUMMARY: PASS=${count_pass} SKIP=${count_skip} FAIL=${count_fail}"
+
 exit $exitcode