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Message-ID: <20230804124549.2562977-3-zhengyejian1@huawei.com>
Date: Fri, 4 Aug 2023 20:45:49 +0800
From: Zheng Yejian <zhengyejian1@...wei.com>
To: <rostedt@...dmis.org>, <mhiramat@...nel.org>,
<vnagarnaik@...gle.com>, <shuah@...nel.org>
CC: <linux-kernel@...r.kernel.org>,
<linux-trace-kernel@...r.kernel.org>,
<linux-kselftest@...r.kernel.org>
Subject: [PATCH 2/2] selftests/ftrace: Add a basic testcase for snapshot
This testcase is constrived to reproduce a problem that the cpu buffers
become unavailable which is due to 'record_disabled' of array_buffer and
max_buffer being messed up.
Local test result after bugfix:
# ./ftracetest test.d/00basic/snapshot1.tc
=== Ftrace unit tests ===
[1] Snapshot and tracing_cpumask [PASS]
[2] (instance) Snapshot and tracing_cpumask [PASS]
# of passed: 2
# of failed: 0
# of unresolved: 0
# of untested: 0
# of unsupported: 0
# of xfailed: 0
# of undefined(test bug): 0
Signed-off-by: Zheng Yejian <zhengyejian1@...wei.com>
---
.../ftrace/test.d/00basic/snapshot1.tc | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/snapshot1.tc
diff --git a/tools/testing/selftests/ftrace/test.d/00basic/snapshot1.tc b/tools/testing/selftests/ftrace/test.d/00basic/snapshot1.tc
new file mode 100644
index 000000000000..0d9b84b3adc3
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/00basic/snapshot1.tc
@@ -0,0 +1,17 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Snapshot and tracing_cpumask
+# requires: trace_marker tracing_cpumask snapshot
+# flags: instance
+
+# This testcase is constrived to reproduce a problem that the cpu buffers
+# become unavailable which is due to 'record_disabled' of array_buffer and
+# max_buffer being messed up.
+
+ORIG_CPUMASK=`cat tracing_cpumask`
+echo 0 > tracing_cpumask
+echo 1 > snapshot
+echo ${ORIG_CPUMASK} > tracing_cpumask
+echo "test input 1" > trace_marker
+grep -q "test input 1" trace
+exit 0
--
2.25.1
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