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Subject[tip:perf/core] perf tests: Implement Zstd comp/decomp integration test
Commit-ID:  bdc35cbc35c0b33428922503c7c85259510911a6
Gitweb: https://git.kernel.org/tip/bdc35cbc35c0b33428922503c7c85259510911a6
Author: Alexey Budankov <alexey.budankov@linux.intel.com>
AuthorDate: Mon, 18 Mar 2019 20:46:17 +0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 15 May 2019 16:36:49 -0300

perf tests: Implement Zstd comp/decomp integration test

Introduce a basic integration test for Zstd based record
compression/decompression using 'perf record' and 'perf report'.

Committer notes:

Reduce a bit the freq (from 25 kHz to 5 kHz) and the number of /dev/null
records read (from 1000 to 500), reducing the time it takes to something
more in line with the time existing 'perf test' entries take to run.

With that in place:

$ time perf test zstd
68: Zstd perf.data compression/decompression : Ok

real 0m10.376s
user 0m0.105s
sys 0m0.440s
$ grep "model name" /proc/cpuinfo | head -1
model name : Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz
$

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/dc007ae4-104a-2b7c-316e-275929025f0d@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/tests/shell/record+zstd_comp_decomp.sh | 35 +++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/tools/perf/tests/shell/record+zstd_comp_decomp.sh b/tools/perf/tests/shell/record+zstd_comp_decomp.sh
new file mode 100755
index 000000000000..93a26a87b1f2
--- /dev/null
+++ b/tools/perf/tests/shell/record+zstd_comp_decomp.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+# Zstd perf.data compression/decompression
+
+trace_file=$(mktemp /tmp/perf.data.XXX)
+perf_tool=perf
+output=/dev/null
+
+skip_if_no_z_record() {
+ $perf_tool record -h 2>&1 | grep '\-z, \-\-compression\-level'
+}
+
+collect_z_record() {
+ echo "Collecting compressed record file:"
+ $perf_tool record -o $trace_file -g -z -F 5000 -- \
+ dd count=500 if=/dev/random of=/dev/null > $output 2>&1
+}
+
+check_compressed_stats() {
+ echo "Checking compressed events stats:"
+ $perf_tool report -i $trace_file --header --stats | \
+ grep -E "(# compressed : Zstd,)|(COMPRESSED events:)" > $output 2>&1
+}
+
+check_compressed_output() {
+ $perf_tool inject -i $trace_file -o $trace_file.decomp &&
+ $perf_tool report -i $trace_file --stdio | head -n -3 > $trace_file.comp.output &&
+ $perf_tool report -i $trace_file.decomp --stdio | head -n -3 > $trace_file.decomp.output &&
+ diff $trace_file.comp.output $trace_file.decomp.output > $output 2>&1
+}
+
+skip_if_no_z_record || exit 2
+collect_z_record && check_compressed_stats && check_compressed_output
+err=$?
+rm -f $trace_file*
+exit $err
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