tests/shell/record%2Bzstd_comp_decomp.sh

0001 #!/bin/sh
0002 # Zstd perf.data compression/decompression
0003
0004 # SPDX-License-Identifier: GPL-2.0
0005
0006 trace_file=$(mktemp /tmp/perf.data.XXX)
0007 perf_tool=perf
0008
0009 skip_if_no_z_record() {
0010         $perf_tool record -h 2>&1 | grep -q '\-z, \-\-compression\-level'
0011 }
0012
0013 collect_z_record() {
0014         echo "Collecting compressed record file:"
0015         [ "$(uname -m)" != s390x ] && gflag='-g'
0016         $perf_tool record -o $trace_file $gflag -z -F 5000 -- \
0017                 dd count=500 if=/dev/urandom of=/dev/null
0018 }
0019
0020 check_compressed_stats() {
0021         echo "Checking compressed events stats:"
0022         $perf_tool report -i $trace_file --header --stats | \
0023                 grep -E "(# compressed : Zstd,)|(COMPRESSED events:)"
0024 }
0025
0026 check_compressed_output() {
0027         $perf_tool inject -i $trace_file -o $trace_file.decomp &&
0028         $perf_tool report -i $trace_file --stdio -F comm,dso,sym | head -n -3 > $trace_file.comp.output &&
0029         $perf_tool report -i $trace_file.decomp --stdio -F comm,dso,sym | head -n -3 > $trace_file.decomp.output &&
0030         diff $trace_file.comp.output $trace_file.decomp.output
0031 }
0032
0033 skip_if_no_z_record || exit 2
0034 collect_z_record && check_compressed_stats && check_compressed_output
0035 err=$?
0036 rm -f $trace_file*
0037 exit $err