perf test shell trace_exit_race: Show what went wrong in verbose mode

If it fails we need to check what was the reason, what were the lines
that didn't match the expected format, so:

  root@number:~# perf test -v "trace exit race"
  --- start ---
  test child forked, pid 2028724
  Lines not matching the expected regexp: ' +[0-9]+\.[0-9]+ +true/[0-9]+ syscalls:sys_enter_exit_group\(\)$':
       0.000 :2028750/2028750 syscalls:sys_enter_exit_group()
  ---- end(-1) ----
  110: perf trace exit race                                            : FAILED!
  root@number:~#

In this case we're not resolving the process COMM for some reason and
fallback to printing just the pid/tid, this will be fixed in a followup
patch.

Howard Chu spotted a problem with single code surrounding a regexp, that
made the test always fail, but since there were some failures when I
tested (COMM not being resolved in some of the results) the end inverse
grep would show some lines and thus didn't notice the single quote
problem.

He also provided a patch to test if less than the number of expected
matches took place but all of them with the expected output, in which
case the inverse grep wouldn't show anything, confusing the tester.

Reviewed-by: Howard Chu <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Benjamin Peterson <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/lkml/ZzdknoHqrJbojb6P@x1
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: acmel

tools/perf/tests/shell/trace_exit_race.sh

@@ -11,11 +11,19 @@
 
 skip_if_no_perf_trace || exit 2
 
+if [ "$1" = "-v" ]; then
+	verbose="1"
+fi
+
+iter=10
+regexp=" +[0-9]+\.[0-9]+ +true/[0-9]+ syscalls:sys_enter_exit_group\(\)$"
+
 trace_shutdown_race() {
-	for _ in $(seq 10); do
+	for _ in $(seq $iter); do
 		perf trace -e syscalls:sys_enter_exit_group true 2>>$file
 	done
-	[ "$(grep -c -E ' +[0-9]+\.[0-9]+ +true/[0-9]+ syscalls:sys_enter_exit_group\(\)$' $file)" = "10" ]
+	result="$(grep -c -E "$regexp" $file)"
+	[ $result = $iter ]
 }
 
 
@@ -27,5 +35,17 @@ export PERF_CONFIG=/dev/null
 
 trace_shutdown_race
 err=$?
+
+if [ $err != 0 ] && [ "${verbose}" = "1" ]; then
+	lines_not_matching=$(mktemp /tmp/temporary_file.XXXXX)
+	if grep -v -E "$regexp" $file > $lines_not_matching ; then
+		echo "Lines not matching the expected regexp: '$regexp':"
+		cat $lines_not_matching
+	else
+		echo "Missing output, expected $iter but only got $result"
+	fi
+	rm -f $lines_not_matching
+fi
+
 rm -f ${file}
 exit $err