From 2c0cb9f56020d2ea006589434d5eb4e702110124 Mon Sep 17 00:00:00 2001 From: Song Liu Date: Tue, 23 Mar 2021 17:42:47 -0300 Subject: [PATCH] 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: Song Liu Requested-by: Arnaldo Carvalho de Melo Tested-by: Arnaldo Carvalho de Melo Acked-by: Namhyung Kim Cc: Jiri Olsa Link: http://lore.kernel.org/lkml/EC00E37D-8587-4662-8E30-7AD5F874FA84@fb.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/tests/shell/stat_bpf_counters.sh | 31 +++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100755 tools/perf/tests/shell/stat_bpf_counters.sh diff --git a/tools/perf/tests/shell/stat_bpf_counters.sh b/tools/perf/tests/shell/stat_bpf_counters.sh new file mode 100755 index 000000000000..22eb31e48ca7 --- /dev/null +++ b/tools/perf/tests/shell/stat_bpf_counters.sh @@ -0,0 +1,31 @@ +#!/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 -- 2.20.1