#!/bin/bash# Zstd perf.data compression/decompression # SPDX-License-Identifier: GPL-2.0 trace_file=$(mktemp /tmp/perf.data.XXX)perf_tool=perf skip_if_no_z_record() {	$perf_tool record -h 2>&1 | grep -q '\-z, \-\-compression\-level'} collect_z_record() {	echo "Collecting compressed record file:"	[ "$(uname -m)" != s390x ] && gflag='-g'	$perf_tool record -o "$trace_file" $gflag -z -F 5000 -- \		dd count=500 if=/dev/urandom of=/dev/null} check_compressed_stats() {	echo "Checking compressed events stats:"	$perf_tool report -i "$trace_file" --header --stats | \		grep -E "(# compressed : Zstd,)|(COMPRESSED events:)"} check_compressed_output() {	$perf_tool inject -i "$trace_file" -o "$trace_file.decomp" &&	$perf_tool report -i "$trace_file" --stdio -F comm,dso,sym | head -n -3 > "$trace_file.comp.output" &&	$perf_tool report -i "$trace_file.decomp" --stdio -F comm,dso,sym | head -n -3 > "$trace_file.decomp.output" &&	diff "$trace_file.comp.output" "$trace_file.decomp.output"} skip_if_no_z_record || exit 2collect_z_record && check_compressed_stats && check_compressed_outputerr=$?rm -f "$trace_file*"exit $err