linux-kernel - Re: [PATCH v1] perf test: Add basic perf diff test

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Date:   Tue, 5 Dec 2023 07:44:17 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        atrajeev@...ux.vnet.ibm.com
Subject: Re: [PATCH v1] perf test: Add basic perf diff test

On 4/12/23 18:00, Ian Rogers wrote:
> On Mon, Nov 20, 2023 at 11:04 AM Ian Rogers <irogers@...gle.com> wrote:
>>
>> There are some old bug reports on perf diff crashing:
>> https://rhaas.blogspot.com/2012/06/perf-good-bad-ugly.html
>>
>> Happening across them I was prompted to add two very basic tests that
>> will give some perf diff coverage.
>>
>> Signed-off-by: Ian Rogers <irogers@...gle.com>
> 
> Ping.
> 
> Thanks,
> Ian
> 
>> ---
>>  tools/perf/tests/shell/diff.sh | 101 +++++++++++++++++++++++++++++++++
>>  1 file changed, 101 insertions(+)
>>  create mode 100755 tools/perf/tests/shell/diff.sh
>>
>> diff --git a/tools/perf/tests/shell/diff.sh b/tools/perf/tests/shell/diff.sh
>> new file mode 100755
>> index 000000000000..213185763688
>> --- /dev/null
>> +++ b/tools/perf/tests/shell/diff.sh
>> @@ -0,0 +1,101 @@
>> +#!/bin/sh
>> +# perf diff tests
>> +# SPDX-License-Identifier: GPL-2.0
>> +
>> +set -e
>> +
>> +err=0
>> +perfdata1=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
>> +perfdata2=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
>> +perfdata3=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
>> +testprog="perf test -w thloop"
>> +testsym="test_loop"

Could it benefit from skip_test_missing_symbol

>> +
>> +cleanup() {
>> +  rm -rf "${perfdata1}"
>> +  rm -rf "${perfdata1}".old
>> +  rm -rf "${perfdata2}"
>> +  rm -rf "${perfdata2}".old
>> +  rm -rf "${perfdata3}"
>> +  rm -rf "${perfdata3}".old
>> +
>> +  trap - EXIT TERM INT
>> +}
>> +
>> +trap_cleanup() {
>> +  cleanup
>> +  exit 1
>> +}
>> +trap trap_cleanup EXIT TERM INT
>> +
>> +make_data() {
>> +  file="$1"
>> +  if ! perf record -o "${file}" ${testprog} 2> /dev/null
>> +  then
>> +    echo "Workload record [Failed record]"
>> +    echo 1
>> +    return
>> +  fi
>> +  if ! perf report -i "${file}" -q | grep -q "${testsym}"
>> +  then
>> +    echo "Workload record [Failed missing output]"
>> +    echo 1
>> +    return
>> +  fi
>> +  echo 0
>> +}
>> +
>> +test_two_files() {
>> +  echo "Basic two file diff test"
>> +  err=$(make_data "${perfdata1}")
>> +  if [ $err != 0 ]
>> +  then
>> +    return
>> +  fi
>> +  err=$(make_data "${perfdata2}")
>> +  if [ $err != 0 ]
>> +  then
>> +    return
>> +  fi
>> +
>> +  if ! perf diff "${perfdata1}" "${perfdata2}" | grep -q "${testsym}"
>> +  then
>> +    echo "Basic two file diff test [Failed diff]"
>> +    err=1
>> +    return
>> +  fi
>> +  echo "Basic two file diff test [Success]"
>> +}
>> +
>> +test_three_files() {
>> +  echo "Basic three file diff test"
>> +  err=$(make_data "${perfdata1}")
>> +  if [ $err != 0 ]
>> +  then
>> +    return
>> +  fi
>> +  err=$(make_data "${perfdata2}")
>> +  if [ $err != 0 ]
>> +  then
>> +    return
>> +  fi
>> +  err=$(make_data "${perfdata3}")
>> +  if [ $err != 0 ]
>> +  then
>> +    return
>> +  fi
>> +
>> +  if ! perf diff "${perfdata1}" "${perfdata2}" "${perfdata3}" | grep -q "${testsym}"
>> +  then
>> +    echo "Basic three file diff test [Failed diff]"
>> +    err=1
>> +    return
>> +  fi
>> +  echo "Basic three file diff test [Success]"
>> +}
>> +
>> +test_two_files
>> +test_three_files
>> +
>> +cleanup
>> +exit $err
>> --
>> 2.43.0.rc1.413.gea7ed67945-goog
>>