perf test: Add test case for the standard 'perf stat' output

#!/bin/bash

# perf stat STD output linter

# SPDX-License-Identifier: GPL-2.0

# Tests various perf stat STD output commands for

# default event and metricgroup

set -e

. $(dirname $0)/lib/stat_output.sh

stat_output=$(mktemp /tmp/__perf_test.stat_output.std.XXXXX)

event_name=(cpu-clock task-clock context-switches cpu-migrations page-faults cycles instructions branches branch-misses stalled-cycles-frontend stalled-cycles-backend)

event_metric=("CPUs utilized" "CPUs utilized" "/sec" "/sec" "/sec" "GHz" "insn per cycle" "/sec" "of all branches" "frontend cycles idle" "backend cycles idle")

metricgroup_name=(TopdownL1 TopdownL2)

cleanup() {

  rm -f "${stat_output}"

  trap - EXIT TERM INT

}

trap_cleanup() {

  cleanup

  exit 1

}

trap trap_cleanup EXIT TERM INT

function commachecker()

{

	local -i cnt=0

	local prefix=1

	case "$1"

	in "--interval")	prefix=2

	;; "--per-thread")	prefix=2

	;; "--system-wide-no-aggr")	prefix=2

	;; "--per-core")	prefix=3

	;; "--per-socket")	prefix=3

	;; "--per-node")	prefix=3

	;; "--per-die")		prefix=3

	;; "--per-cache")	prefix=3

	esac

	while read line

	do

		# Ignore initial "started on" comment.

		x=${line:0:1}

		[ "$x" = "#" ] && continue

		# Ignore initial blank line.

		[ "$line" = "" ] && continue

		# Ignore "Performance counter stats"

		x=${line:0:25}

		[ "$x" = "Performance counter stats" ] && continue

		# Ignore "seconds time elapsed" and break

		[[ "$line" == *"time elapsed"* ]] && break

		main_body=$(echo $line | cut -d' ' -f$prefix-)

		x=${main_body%#*}

		# Check default metricgroup

		y=$(echo $x | tr -d ' ')

		[ "$y" = "" ] && continue

		for i in "${!metricgroup_name[@]}"; do

			[[ "$y" == *"${metricgroup_name[$i]}"* ]] && break

		done

		[[ "$y" == *"${metricgroup_name[$i]}"* ]] && continue

		# Check default event

		for i in "${!event_name[@]}"; do

			[[ "$x" == *"${event_name[$i]}"* ]] && break

		done

		[[ ! "$x" == *"${event_name[$i]}"* ]] && {

			echo "Unknown event name in $line" 1>&2

			exit 1;

		}

		# Check event metric if it exists

		[[ ! "$main_body" == *"#"* ]] && continue

		[[ ! "$main_body" == *"${event_metric[$i]}"* ]] && {

			echo "wrong event metric. expected ${event_metric[$i]} in $line" 1>&2

			exit 1;

		}

	done < "${stat_output}"

	return 0

}

perf_cmd="-o ${stat_output}"

skip_test=$(check_for_topology)

check_no_args "STD" "$perf_cmd"

check_system_wide "STD" "$perf_cmd"

check_interval "STD" "$perf_cmd"

check_per_thread "STD" "$perf_cmd"

check_per_node "STD" "$perf_cmd"

if [ $skip_test -ne 1 ]

then

	check_system_wide_no_aggr "STD" "$perf_cmd"

	check_per_core "STD" "$perf_cmd"

	check_per_cache_instance "STD" "$perf_cmd"

	check_per_die "STD" "$perf_cmd"

	check_per_socket "STD" "$perf_cmd"

else

	echo "[Skip] Skipping tests for system_wide_no_aggr, per_core, per_die and per_socket since socket id exposed via topology is invalid"

fi

cleanup

exit 0