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

Add a new test case to verify the standard 'perf stat' output with
different options.
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ahmad Yasin <ahmad.yasin@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20230616031420.3751973-5-kan.liang@linux.intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/stat+std_output.sh

+#!/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