#!/bin/bash# perf stat JSON output linter# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)# Checks various perf stat JSON output commands for the# correct number of fields. set -e skip_test=0 shelldir=$(dirname "$0")# shellcheck source=lib/setup_python.sh. "${shelldir}"/lib/setup_python.shpythonchecker=$(dirname $0)/lib/perf_json_output_lint.py stat_output=$(mktemp /tmp/__perf_test.stat_output.json.XXXXX) cleanup() {  rm -f "${stat_output}"   trap - EXIT TERM INT} trap_cleanup() {  cleanup  exit 1}trap trap_cleanup EXIT TERM INT # Return true if perf_event_paranoid is > $1 and not running as root.function ParanoidAndNotRoot(){	 [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]} check_no_args(){	echo -n "Checking json output: no args "	perf stat -j -o "${stat_output}" true	$PYTHON $pythonchecker --no-args --file "${stat_output}"	echo "[Success]"} check_system_wide(){	echo -n "Checking json output: system wide "	if ParanoidAndNotRoot 0	then		echo "[Skip] paranoia and not root"		return	fi	perf stat -j -a -o "${stat_output}" true	$PYTHON $pythonchecker --system-wide --file "${stat_output}"	echo "[Success]"} check_system_wide_no_aggr(){	echo -n "Checking json output: system wide no aggregation "	if ParanoidAndNotRoot 0	then		echo "[Skip] paranoia and not root"		return	fi	perf stat -j -A -a --no-merge -o "${stat_output}" true	$PYTHON $pythonchecker --system-wide-no-aggr --file "${stat_output}"	echo "[Success]"} check_interval(){	echo -n "Checking json output: interval "	perf stat -j -I 1000 -o "${stat_output}" true	$PYTHON $pythonchecker --interval --file "${stat_output}"	echo "[Success]"}  check_event(){	echo -n "Checking json output: event "	perf stat -j -e cpu-clock -o "${stat_output}" true	$PYTHON $pythonchecker --event --file "${stat_output}"	echo "[Success]"} check_per_core(){	echo -n "Checking json output: per core "	if ParanoidAndNotRoot 0	then		echo "[Skip] paranoia and not root"		return	fi	perf stat -j --per-core -a -o "${stat_output}" true	$PYTHON $pythonchecker --per-core --file "${stat_output}"	echo "[Success]"} check_per_thread(){	echo -n "Checking json output: per thread "	if ParanoidAndNotRoot 0	then		echo "[Skip] paranoia and not root"		return	fi	perf stat -j --per-thread -p $$ -o "${stat_output}" true	$PYTHON $pythonchecker --per-thread --file "${stat_output}"	echo "[Success]"} check_per_cache_instance(){	echo -n "Checking json output: per cache_instance "	if ParanoidAndNotRoot 0	then		echo "[Skip] paranoia and not root"		return	fi	perf stat -j --per-cache -a true 2>&1 | $PYTHON $pythonchecker --per-cache	echo "[Success]"} check_per_cluster(){	echo -n "Checking json output: per cluster "	if ParanoidAndNotRoot 0	then		echo "[Skip] paranoia and not root"		return	fi	perf stat -j --per-cluster -a true 2>&1 | $PYTHON $pythonchecker --per-cluster	echo "[Success]"} check_per_die(){	echo -n "Checking json output: per die "	if ParanoidAndNotRoot 0	then		echo "[Skip] paranoia and not root"		return	fi	perf stat -j --per-die -a -o "${stat_output}" true	$PYTHON $pythonchecker --per-die --file "${stat_output}"	echo "[Success]"} check_per_node(){	echo -n "Checking json output: per node "	if ParanoidAndNotRoot 0	then		echo "[Skip] paranoia and not root"		return	fi	perf stat -j --per-node -a -o "${stat_output}" true	$PYTHON $pythonchecker --per-node --file "${stat_output}"	echo "[Success]"} check_per_socket(){	echo -n "Checking json output: per socket "	if ParanoidAndNotRoot 0	then		echo "[Skip] paranoia and not root"		return	fi	perf stat -j --per-socket -a -o "${stat_output}" true	$PYTHON $pythonchecker --per-socket --file "${stat_output}"	echo "[Success]"} check_metric_only(){	echo -n "Checking json output: metric only "	if [ "$(uname -m)" = "s390x" ] && ! grep '^facilities' /proc/cpuinfo  | grep -qw 67	then		echo "[Skip] CPU-measurement counter facility not installed"		return	fi	perf stat -j --metric-only -M page_faults_per_second -o "${stat_output}" true	$PYTHON $pythonchecker --metric-only --file "${stat_output}"	echo "[Success]"} # The perf stat options for per-socket, per-core, per-die# and -A ( no_aggr mode ) uses the info fetched from this# directory: "/sys/devices/system/cpu/cpu*/topology". For# example, socket value is fetched from "physical_package_id"# file in topology directory.# Reference: cpu__get_topology_int in util/cpumap.c# If the platform doesn't expose topology information, values# will be set to -1. For example, incase of pSeries platform# of powerpc, value for  "physical_package_id" is restricted# and set to -1. Check here validates the socket-id read from# topology file before proceeding further FILE_LOC="/sys/devices/system/cpu/cpu*/topology/"FILE_NAME="physical_package_id" check_for_topology(){	if ! ParanoidAndNotRoot 0	then		socket_file=`ls $FILE_LOC/$FILE_NAME | head -n 1`		[ -z $socket_file ] && return 0		socket_id=`cat $socket_file`		[ $socket_id == -1 ] && skip_test=1		return 0	fi} check_for_topologycheck_no_argscheck_system_widecheck_intervalcheck_eventcheck_per_threadcheck_per_nodecheck_metric_onlyif [ $skip_test -ne 1 ]then	check_system_wide_no_aggr	check_per_core	check_per_cache_instance	check_per_cluster	check_per_die	check_per_socketelse	echo "[Skip] Skipping tests for system_wide_no_aggr, per_core, per_die and per_socket since socket id exposed via topology is invalid"ficleanupexit 0