linux-kernel - [PATCH v2] perf test: Introduce script for data symbol testing

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Message-Id: <20220806033234.121781-1-leo.yan@linaro.org>
Date:   Sat,  6 Aug 2022 11:32:34 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v2] perf test: Introduce script for data symbol testing

This commit introduces a shell script for data symbol testing.

The testing is designed a data structure with 64-byte alignment, it has
two fields "data1" and "data2", and other fields are reserved.

Using "perf mem" command, we can record and report memory samples for a
self-contained workload with 1 second duration.  If have no any memory
sample for the data structure "buf1", it reports failure;  and by
checking the offset in structure "buf1", if any memory accessing is not
for "data1" and "data2" fields, it means wrong data symbol parsing and
returns failure.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
---

Changes from v1:
- Removed "killall" since the test has no child process (Ian);
- Used "char" instead of "long" in the buf structure.

 tools/perf/tests/shell/test_data_symbol.sh | 92 ++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100755 tools/perf/tests/shell/test_data_symbol.sh

diff --git a/tools/perf/tests/shell/test_data_symbol.sh b/tools/perf/tests/shell/test_data_symbol.sh
new file mode 100755
index 000000000000..d007513ecfbe
--- /dev/null
+++ b/tools/perf/tests/shell/test_data_symbol.sh
@@ -0,0 +1,92 @@
+#!/bin/bash
+# Test data symbol
+
+# SPDX-License-Identifier: GPL-2.0
+# Leo Yan <leo.yan@...aro.org>, 2022
+
+skip_if_no_mem_event() {
+	perf mem record -e list 2>&1 | egrep -q 'available' && return 0
+	return 2
+}
+
+skip_if_no_mem_event || exit 2
+
+# skip if there's no compiler
+if ! [ -x "$(command -v cc)" ]; then
+	echo "skip: no compiler, install gcc"
+	exit 2
+fi
+
+TEST_PROGRAM_SOURCE=$(mktemp /tmp/__perf_test.program.XXXXX.c)
+TEST_PROGRAM=$(mktemp /tmp/__perf_test.program.XXXXX)
+PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
+
+check_result() {
+	# The memory report format is as below:
+	#    99.92%  ...  [.] buf1+0x38  ...
+	result=$(perf mem report -i ${PERF_DATA} --stdio 2>&1 | egrep "buf1" | \
+		awk '{ for (i = 1; i <= NF; i++) { if ($i ~ /^buf1/) { print $i; break; } } }')
+
+	# Testing is failed if has no any sample for "buf1"
+	[ -z "$result" ] && return 1
+
+	while IFS= read -r line; do
+		# The "data1" and "data2" fields in structure "buf1" have
+		# offset "0x0" and "0x38", returns failure if detect any
+		# other offset value.
+		if [ "$line" != "buf1+0x0" ] && [ "$line" != "buf1+0x38" ]; then
+			return 1
+		fi
+	done <<< "$result"
+
+	return 0
+}
+
+cleanup_files()
+{
+	echo "Cleaning up files..."
+	rm -f ${PERF_DATA}
+	rm -f ${TEST_PROGRAM_SOURCE}
+	rm -f ${TEST_PROGRAM}
+}
+
+trap cleanup_files exit term int
+
+# compile test program
+cat << EOF > $TEST_PROGRAM_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+typedef struct _buf {
+	char data1;
+	char reserved[55];
+	char data2;
+} buf __attribute__((aligned(64)));
+
+static buf buf1;
+
+int main() {
+	int i;
+	for (;;) {
+		buf1.data1++;
+		buf1.data2 += buf1.data1;
+	}
+	return 0;
+}
+EOF
+
+echo "Compiling test program..."
+cc $TEST_PROGRAM_SOURCE -o $TEST_PROGRAM || exit 1
+
+echo "Recording workload..."
+perf mem record --all-user -o ${PERF_DATA} -- $TEST_PROGRAM &
+PERFPID=$!
+
+sleep 1
+
+kill $PERFPID
+wait $PERFPID
+
+check_result
+exit $?
-- 
2.25.1