linux-kernel - Re: [PATCH v2 7/7] perf test: Add test case for record sideband events

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Date:   Wed, 19 Jul 2023 09:48:19 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Yang Jihong <yangjihong1@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org, adrian.hunter@...el.com,
        kan.liang@...ux.intel.com, james.clark@....com,
        tmricht@...ux.ibm.com, ak@...ux.intel.com,
        anshuman.khandual@....com, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 7/7] perf test: Add test case for record sideband events

On Fri, Jul 14, 2023 at 8:31 PM Yang Jihong <yangjihong1@...wei.com> wrote:
>
> Add a new test case to record sideband events for all CPUs when tracing
> selected CPUs
>
> Test result:
>
>   # ./perf test list 2>&1 | grep 'perf record sideband tests'
>    95: perf record sideband tests
>   # ./perf test 95
>    95: perf record sideband tests                                      : Ok
>
> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
> ---
>  tools/perf/tests/shell/record_tracking.sh | 44 +++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
>  create mode 100755 tools/perf/tests/shell/record_tracking.sh
>
> diff --git a/tools/perf/tests/shell/record_tracking.sh b/tools/perf/tests/shell/record_tracking.sh

Could this be record_sideband.sh ? It will be more consistent with the
test output...

Thanks,
Ian

> new file mode 100755
> index 000000000000..44fc0af92f81
> --- /dev/null
> +++ b/tools/perf/tests/shell/record_tracking.sh
> @@ -0,0 +1,44 @@
> +#!/bin/sh
> +# perf record sideband tests
> +# SPDX-License-Identifier: GPL-2.0
> +
> +set -e
> +
> +err=0
> +perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
> +
> +can_cpu_wide()
> +{
> +    if ! perf record -o ${perfdata} -BN --no-bpf-event -e dummy:u -C $1 true 2>&1 >/dev/null
> +    then
> +        echo "record sideband test [Skipped cannot record cpu$1]"
> +        err=2
> +    fi
> +
> +    rm -f ${perfdata}
> +    return $err
> +}
> +
> +test_system_wide_tracking()
> +{
> +    # Need CPU 0 and CPU 1
> +    can_cpu_wide 0 || return 0
> +    can_cpu_wide 1 || return 0
> +
> +    # Record on CPU 0 a task running on CPU 1
> +    perf record -BN --no-bpf-event -o ${perfdata} -e dummy:u -C 0 -- taskset --cpu-list 1 true
> +
> +    # Should get MMAP events from CPU 1
> +    mmap_cnt=`perf script -i ${perfdata} --show-mmap-events -C 1 2>/dev/null | grep MMAP | wc -l`
> +
> +    rm -f ${perfdata}
> +
> +    if [ ${mmap_cnt} -gt 0 ] ; then
> +        return 0
> +    fi
> +
> +    echo "Failed to record MMAP events on CPU 1 when tracing CPU 0"
> +    return 1
> +}
> +
> +test_system_wide_tracking
> --
> 2.30.GIT
>