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