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#!/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" "$trace_file.decomp.output"
}
skip_if_no_z_record || exit 2
collect_z_record && check_compressed_stats && check_compressed_output
err=$?
rm -f "$trace_file*"
exit $err
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