1#!/bin/sh
2# perf stat --bpf-counters test
3# SPDX-License-Identifier: GPL-2.0
4
5set -e
6
7# check whether $2 is within +/- 10% of $1
8compare_number()
9{
10       first_num=$1
11       second_num=$2
12
13       # upper bound is first_num * 110%
14       upper=$(( $first_num + $first_num / 10 ))
15       # lower bound is first_num * 90%
16       lower=$(( $first_num - $first_num / 10 ))
17
18       if [ $second_num -gt $upper ] || [ $second_num -lt $lower ]; then
19               echo "The difference between $first_num and $second_num are greater than 10%."
20               exit 1
21       fi
22}
23
24# skip if --bpf-counters is not supported
25perf stat --bpf-counters true > /dev/null 2>&1 || exit 2
26
27base_cycles=$(perf stat --no-big-num -e cycles -- perf bench sched messaging -g 1 -l 100 -t 2>&1 | awk '/cycles/ {print $1}')
28bpf_cycles=$(perf stat --no-big-num --bpf-counters -e cycles -- perf bench sched messaging -g 1 -l 100 -t 2>&1 | awk '/cycles/ {print $1}')
29
30compare_number $base_cycles $bpf_cycles
31exit 0
32