Commit 2c0cb9f5 authored by Song Liu's avatar Song Liu Committed by Arnaldo Carvalho de Melo
Browse files

perf test: Add a shell test for 'perf stat --bpf-counters' new option 



Add a test to compare the output of perf-stat with and without option
--bpf-counters. If the difference is more than 10%, the test is considered
as failed.

Committer testing:

  # perf test bpf-counters
  86: perf stat --bpf-counters test                                   : Ok
  # perf test -v bpf-counters
  86: perf stat --bpf-counters test                                   :
  --- start ---
  test child forked, pid 2433339
  test child finished with 0
  ---- end ----
  perf stat --bpf-counters test: Ok
  #

Signed-off-by: default avatarSong Liu <songliubraving@fb.com>
Requested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/EC00E37D-8587-4662-8E30-7AD5F874FA84@fb.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 435b46ef

tools/perf/tests/shell/stat_bpf_counters.sh

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+31 −0
Original line number Diff line number Diff line 
#!/bin/sh

# perf stat --bpf-counters test

# SPDX-License-Identifier: GPL-2.0



set -e



# check whether $2 is within +/- 10% of $1

compare_number()

{

       first_num=$1

       second_num=$2



       # upper bound is first_num * 110%

       upper=$(( $first_num + $first_num / 10 ))

       # lower bound is first_num * 90%

       lower=$(( $first_num - $first_num / 10 ))



       if [ $second_num -gt $upper ] || [ $second_num -lt $lower ]; then

               echo "The difference between $first_num and $second_num are greater than 10%."

               exit 1

       fi

}



# skip if --bpf-counters is not supported

perf stat --bpf-counters true > /dev/null 2>&1 || exit 2



base_cycles=$(perf stat --no-big-num -e cycles -- perf bench sched messaging -g 1 -l 100 -t 2>&1 | awk '/cycles/ {print $1}')

bpf_cycles=$(perf stat --no-big-num --bpf-counters -e cycles -- perf bench sched messaging -g 1 -l 100 -t 2>&1 | awk '/cycles/ {print $1}')



compare_number $base_cycles $bpf_cycles

exit 0