linux-kernel - Re: [PATCH v1] perf test: Skip diff test if test

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Date:   Tue, 5 Dec 2023 21:22:14 +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-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf test: Skip diff test if test_loop is missing

On 5/12/23 18:49, Ian Rogers wrote:
> The diff test depends on finding the symbol test_loop in perf and will
> fail if perf has been stripped and no debug object is available. In
> that case, skip the test instead.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/tests/shell/diff.sh | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/tools/perf/tests/shell/diff.sh b/tools/perf/tests/shell/diff.sh
> index 213185763688..14b87af88703 100755
> --- a/tools/perf/tests/shell/diff.sh
> +++ b/tools/perf/tests/shell/diff.sh
> @@ -9,8 +9,15 @@ perfdata1=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
>  perfdata2=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
>  perfdata3=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
>  testprog="perf test -w thloop"
> +
> +shelldir=$(dirname "$0")
> +# shellcheck source=lib/perf_has_symbol.sh
> +. "${shelldir}"/lib/perf_has_symbol.sh
> +
>  testsym="test_loop"
>  
> +skip_test_missing_symbol ${testsym}
> +
>  cleanup() {
>    rm -rf "${perfdata1}"
>    rm -rf "${perfdata1}".old

The verbose output in the error case could also
be tweaked.

Before patch:

 $ strip tools/perf/perf
 $ tools/perf/perf buildid-cache -p $(realpath tools/perf/perf)
 $ tools/perf/perf test -v 'diff test'
  85: perf diff tests                                                 :
 --- start ---
 test child forked, pid 8621
 Basic two file diff test
 ./tools/perf/tests/shell/diff.sh: 51: [: Workload: unexpected operator
 ./tools/perf/tests/shell/diff.sh: 56: [: Workload: unexpected operator
 Basic two file diff test [Failed diff]
 Basic three file diff test
 ./tools/perf/tests/shell/diff.sh: 73: [: Workload: unexpected operator
 ./tools/perf/tests/shell/diff.sh: 78: [: Workload: unexpected operator
 ./tools/perf/tests/shell/diff.sh: 83: [: Workload: unexpected operator
 Basic three file diff test [Failed diff]
 test child finished with -1
 ---- end ----
 perf diff tests: FAILED!

After patch:

 $ tools/perf/perf test -v 'diff test'
  85: perf diff tests                                                 :
 --- start ---
 test child forked, pid 8853
 perf does not have symbol 'test_loop'
 perf is missing symbols - skipping test
 test child finished with -2
 ---- end ----
 perf diff tests: Skip

 and with symbols:

 $ tools/perf/perf test -v 'diff test'
  85: perf diff tests                                                 :
 --- start ---
 test child forked, pid 10122
  103e20-103e60 g test_loop
 perf does have symbol 'test_loop'
 Basic two file diff test
 Basic two file diff test [Success]
 Basic three file diff test
 Basic three file diff test [Success]
 test child finished with 0
 ---- end ----
 perf diff tests: Ok



Tested-by: Adrian Hunter <adrian.hunter@...el.com>