#!/bin/bash# perf stat --bpf-counters test (exclusive)# SPDX-License-Identifier: GPL-2.0 set -e # Get the first allowed CPUCPU=$(taskset -c -p $$ | awk -F': ' '{print $2}' | awk -F'[,-]' '{print $1}')if [ -z "$CPU" ]; then	CPU=0fiworkload=(taskset -c "$CPU" awk 'BEGIN { for (i=0; i<10000000; i++) sum+=i }') # check whether $2 is within +/- 15% of $1compare_number(){	first_num=$1	second_num=$2 	# upper bound is first_num * 115%	upper=$(expr $first_num + $first_num / 20 \* 3 )	# lower bound is first_num * 85%	lower=$(expr $first_num - $first_num / 20 \* 3 ) 	if [ $second_num -gt $upper ] || [ $second_num -lt $lower ]; then		echo "The difference between $first_num and $second_num are greater than 15%."		exit 1	fi} check_counts(){	base_instructions=$1	bpf_instructions=$2 	if [ "$base_instructions" = "<not" ]; then		echo "Skipping: instructions event not counted"		exit 2	fi	if [ "$bpf_instructions" = "<not" ]; then		echo "Failed: instructions not counted with --bpf-counters"		exit 1	fi} test_bpf_counters(){	printf "Testing --bpf-counters "	base_instructions=$(perf stat --no-big-num -e instructions:u -- "${workload[@]}" 2>&1 | \				awk -v i=0 -v c=0 '/instructions/ { \					if ($1 != "<not") { i++; c += $1 } \				} END { if (i > 0) printf "%.0f", c; else print "<not" }')	bpf_instructions=$(perf stat --no-big-num --bpf-counters -e instructions:u \				-- "${workload[@]}"  2>&1 | \				awk -v i=0 -v c=0 '/instructions/ { \					if ($1 != "<not") { i++; c += $1 } \				} END { if (i > 0) printf "%.0f", c; else print "<not" }')	check_counts $base_instructions $bpf_instructions	compare_number $base_instructions $bpf_instructions	echo "[Success]"} test_bpf_modifier(){	printf "Testing bpf event modifier "	stat_output=$(perf stat --no-big-num \		-e instructions/name=base_instructions/u,instructions/name=bpf_instructions/bu \		-- "${workload[@]}" 2>&1)	base_instructions=$(echo "$stat_output"| \				awk -v i=0 -v c=0 '/base_instructions/ { \					if ($1 != "<not") { i++; c += $1 } \				} END { if (i > 0) printf "%.0f", c; else print "<not" }')	bpf_instructions=$(echo "$stat_output"| \				awk -v i=0 -v c=0 '/bpf_instructions/ { \					if ($1 != "<not") { i++; c += $1 } \				} END { if (i > 0) printf "%.0f", c; else print "<not" }')	check_counts $base_instructions $bpf_instructions	compare_number $base_instructions $bpf_instructions	echo "[Success]"} # skip if --bpf-counters is not supportedif ! perf stat -e instructions --bpf-counters true > /dev/null 2>&1; then	if [ "$1" = "-v" ]; then		echo "Skipping: --bpf-counters not supported"		perf --no-pager stat -e instructions --bpf-counters true || true	fi	exit 2fi test_bpf_counterstest_bpf_modifier exit 0