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Subject[PATCH v4] perf test: Introduce script for data symbol testing
Date
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@linaro.org>
---

Channges from v3:
- Add specific testing chunk for AMD CPUs (Ravi).

tools/perf/tests/shell/test_data_symbol.sh | 93 ++++++++++++++++++++++
1 file changed, 93 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..43ab1e37407c
--- /dev/null
+++ b/tools/perf/tests/shell/test_data_symbol.sh
@@ -0,0 +1,93 @@
+#!/bin/bash
+# Test data symbol
+
+# SPDX-License-Identifier: GPL-2.0
+# Leo Yan <leo.yan@linaro.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 "$(command -v cc)" ]; then
+ echo "skip: no compiler, install gcc"
+ exit 2
+fi
+
+TEST_PROGRAM=$(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} -s symbol_daddr -q 2>&1 |
+ awk '/buf1/ { print $4 }')
+
+ # Testing is failed if has no any sample for "buf1"
+ [ -z "$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}
+}
+
+trap cleanup_files exit term int
+
+# compile test program
+echo "Compiling test program..."
+cat << EOF | cc -o ${TEST_PROGRAM} -x c -
+typedef struct _buf {
+ char data1;
+ char reserved[55];
+ char data2;
+} buf __attribute__((aligned(64)));
+
+static buf buf1;
+
+int main(void) {
+ for (;;) {
+ buf1.data1++;
+ buf1.data2 += buf1.data1;
+ }
+ return 0;
+}
+EOF
+
+echo "Recording workload..."
+
+# perf mem/c2c internally uses IBS PMU on AMD CPU which doesn't support
+# user/kernel filtering and per-process monitoring, spin program on
+# specific CPU and test in per-CPU mode.
+is_amd=$(egrep -c 'vendor_id.*AuthenticAMD' /proc/cpuinfo)
+if (($is_amd >= 1)); then
+ perf mem record -o ${PERF_DATA} -- -C 0 -- taskset -c 0 $TEST_PROGRAM &
+else
+ perf mem record --all-user -o ${PERF_DATA} -- $TEST_PROGRAM &
+fi
+
+PERFPID=$!
+
+sleep 1
+
+kill $PERFPID
+wait $PERFPID
+
+check_result
+exit $?
--
2.34.1
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