linux-kernel - [PATCH 3/3] perf test: Add kernel lock contention test

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Date:   Fri, 23 Sep 2022 17:42:21 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org
Subject: [PATCH 3/3] perf test: Add kernel lock contention test

Add a new shell test to check if both normal perf lock record +
contention and BPF (with -b) option are working.  Use perf bench
sched messaging as a workload since it'd create some contention for
sending and receiving messages.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/tests/shell/lock_contention.sh | 73 +++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100755 tools/perf/tests/shell/lock_contention.sh

diff --git a/tools/perf/tests/shell/lock_contention.sh b/tools/perf/tests/shell/lock_contention.sh
new file mode 100755
index 000000000000..04bf604e3c6f
--- /dev/null
+++ b/tools/perf/tests/shell/lock_contention.sh
@@ -0,0 +1,73 @@
+#!/bin/sh
+# kernel lock contention analysis test
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+err=0
+perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
+result=$(mktemp /tmp/__perf_test.result.XXXXX)
+
+cleanup() {
+	rm -f ${perfdata}
+	rm -f ${result}
+	trap - exit term int
+}
+
+trap_cleanup() {
+	cleanup
+	exit ${err}
+}
+trap trap_cleanup exit term int
+
+check() {
+	if [ `id -u` != 0 ]; then
+		echo "[Skip] No root permission"
+		err=2
+		exit
+	fi
+
+	if ! perf list | grep -q lock:contention_begin; then
+		echo "[Skip] No lock contention tracepoints"
+		err=2
+		exit
+	fi
+}
+
+test_record()
+{
+	echo "Testing perf lock record and perf lock contention"
+	perf lock record -o ${perfdata} -- perf bench sched messaging > /dev/null 2>&1
+	# the output goes to the stderr and we expect only 1 output (-E 1)
+	perf lock contention -i ${perfdata} -E 1 -q 2> ${result}
+	if [ $(cat "${result}" | wc -l) != "1" ]; then
+		echo "[Fail] Recorded result count is not 1:" $(cat "${result}" | wc -l)
+		err=1
+		exit
+	fi
+}
+
+test_bpf()
+{
+	echo "Testing perf lock contention --use-bpf"
+
+	if ! perf lock con -b true > /dev/null 2>&1 ; then
+		echo "[Skip] No BPF support"
+		exit
+	fi
+
+	# the perf lock contention output goes to the stderr
+	perf lock con -a -b -E 1 -q -- perf bench sched messaging > /dev/null 2> ${result}
+	if [ $(cat "${result}" | wc -l) != "1" ]; then
+		echo "[Fail] BPF result count is not 1:" $(cat "${result}" | wc -l)
+		err=1
+		exit
+	fi
+}
+
+check
+
+test_record
+test_bpf
+
+exit ${err}
-- 
2.37.3.998.g577e59143f-goog