1#!/bin/sh
 2# Zstd perf.data compression/decompression
 3
 4# SPDX-License-Identifier: GPL-2.0
 5
 6trace_file=$(mktemp /tmp/perf.data.XXX)
 7perf_tool=perf
 8
 9skip_if_no_z_record() {
10	$perf_tool record -h 2>&1 | grep -q '\-z, \-\-compression\-level'
11}
12
13collect_z_record() {
14	echo "Collecting compressed record file:"
15	[ "$(uname -m)" != s390x ] && gflag='-g'
16	$perf_tool record -o "$trace_file" $gflag -z -F 5000 -- \
17		dd count=500 if=/dev/urandom of=/dev/null
18}
19
20check_compressed_stats() {
21	echo "Checking compressed events stats:"
22	$perf_tool report -i "$trace_file" --header --stats | \
23		grep -E "(# compressed : Zstd,)|(COMPRESSED events:)"
24}
25
26check_compressed_output() {
27	$perf_tool inject -i "$trace_file" -o "$trace_file.decomp" &&
28	$perf_tool report -i "$trace_file" --stdio -F comm,dso,sym | head -n -3 > "$trace_file.comp.output" &&
29	$perf_tool report -i "$trace_file.decomp" --stdio -F comm,dso,sym | head -n -3 > "$trace_file.decomp.output" &&
30	diff "$trace_file.comp.output" "$trace_file.decomp.output"
31}
32
33skip_if_no_z_record || exit 2
34collect_z_record && check_compressed_stats && check_compressed_output
35err=$?
36rm -f "$trace_file*"
37exit $err