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

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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 <howardchu95@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Benjamin Peterson <benjamin@engflow.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/lkml/ZzdknoHqrJbojb6P@x1
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2024-11-14 18:13:17 -03:00
parent f72bcb92e9
commit 7ca41faa5f
1 changed files with 22 additions and 2 deletions
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24
tools/perf/tests/shell/trace_exit_race.sh
View File

@ -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