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#!/bin/sh
# perf stat --bpf-counters test
# SPDX-License-Identifier: GPL-2.0
set -e
# check whether $2 is within +/- 20% of $1
compare_number()
{
first_num=$1
second_num=$2
# upper bound is first_num * 120%
upper=$(expr $first_num + $first_num / 5 )
# lower bound is first_num * 80%
lower=$(expr $first_num - $first_num / 5 )
if [ $second_num -gt $upper ] || [ $second_num -lt $lower ]; then
echo "The difference between $first_num and $second_num are greater than 20%."
exit 1
fi
}
# skip if --bpf-counters is not supported
if ! perf stat -e cycles --bpf-counters true > /dev/null 2>&1; then
if [ "$1" = "-v" ]; then
echo "Skipping: --bpf-counters not supported"
perf --no-pager stat -e cycles --bpf-counters true || true
fi
exit 2
fi
base_cycles=$(perf stat --no-big-num -e cycles -- perf bench sched messaging -g 1 -l 100 -t 2>&1 | awk '/cycles/ {print $1}')
if [ "$base_cycles" = "<not" ]; then
echo "Skipping: cycles event not counted"
exit 2
fi
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 $1}')
if [ "$bpf_cycles" = "<not" ]; then
echo "Failed: cycles not counted with --bpf-counters"
exit 1
fi
compare_number $base_cycles $bpf_cycles
exit 0
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