linux-kernel - Re: [PATCH 4/4] perf tests: Add leader sampling test in record tests

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Date: Tue, 2 Jul 2024 14:07:47 -0400
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Dapeng Mi <dapeng1.mi@...ux.intel.com>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
 Adrian Hunter <adrian.hunter@...el.com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 Yanfei Xu <yanfei.xu@...el.com>, Dapeng Mi <dapeng1.mi@...el.com>
Subject: Re: [PATCH 4/4] perf tests: Add leader sampling test in record tests



On 2024-07-02 6:40 p.m., Dapeng Mi wrote:
> Add leader sampling test to validate event counts are captured into
> record and the count value is consistent.
> 
> Suggested-by: Kan Liang <kan.liang@...ux.intel.com>
> Signed-off-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
> ---
>  tools/perf/tests/shell/record.sh | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh
> index 3d1a7759a7b2..8e3e66780fed 100755
> --- a/tools/perf/tests/shell/record.sh
> +++ b/tools/perf/tests/shell/record.sh
> @@ -17,6 +17,7 @@ skip_test_missing_symbol ${testsym}
>  
>  err=0
>  perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
> +script_output=$(mktemp /tmp/__perf_test.perf.data.XXXXX.script)
>  testprog="perf test -w thloop"
>  cpu_pmu_dir="/sys/bus/event_source/devices/cpu*"
>  br_cntr_file="/caps/branch_counter_nr"
> @@ -190,11 +191,38 @@ test_branch_counter() {
>    echo "Basic branch counter test [Success]"
>  }
>  
> +test_leader_sampling() {
> +  echo "Basic leader sampling test"
> +  if ! perf record -o "${perfdata}" -e "{branches,branches}:Su" perf test -w brstack 2> /dev/null

I think we still need a case to verify the topdown fix you did in the
patch set.
Since the topdown is platform specific, you may want to skip it on the
platform which doesn't support perf metrics. For example, check if the
slots event exists in the event folder.

Thanks,
Kan
> +  then
> +    echo "Leader sampling [Failed record]"
> +    err=1
> +    return
> +  fi
> +  index=0
> +  perf script -i "${perfdata}" > $script_output
> +  while IFS= read -r line
> +  do
> +    # Check if the two branches counts are equal in each record
> +    branches=$(echo $line | awk '{for(i=1;i<=NF;i++) if($i=="branches:") print $(i-1)}')
> +    if [ $(($index%2)) -ne 0 ] && [ ${branches}x != ${prev_branches}x ]
> +    then
> +      echo "Leader sampling [Failed inconsistent branches count]"
> +      err=1
> +      return
> +    fi
> +    index=$(($index+1))
> +    prev_branches=$branches
> +  done < $script_output
> +  echo "Basic leader sampling test [Success]"
> +}
> +
>  test_per_thread
>  test_register_capture
>  test_system_wide
>  test_workload
>  test_branch_counter
> +test_leader_sampling
>  
>  cleanup
>  exit $err