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Message-Id: <153563891312.29700.7554628761200928605.stgit@devbox>
Date: Thu, 30 Aug 2018 23:21:53 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Shuah Khan <shuah@...nel.org>, Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 20/28] selftests/ftrace: Add ringbuffer size changing testcase
Add a testcase for changing ringbuffer size. This tests
not only ringbuffer size but also tests the imbalance
per-cpu buffer size change too.
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
Changes in v3:
- Run test on an instance too.
---
.../ftrace/test.d/00basic/ringbuffer_size.tc | 22 ++++++++++++++++++++
1 file changed, 22 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc
diff --git a/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc
new file mode 100644
index 000000000000..ab70f0077c35
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc
@@ -0,0 +1,22 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Change the ringbuffer size
+# flags: instance
+
+rb_size_test() {
+ORIG=`cat buffer_size_kb`
+
+expr $ORIG / 2 > buffer_size_kb
+
+expr $ORIG \* 2 > buffer_size_kb
+
+echo $ORIG > buffer_size_kb
+}
+
+rb_size_test
+
+: "If per-cpu buffer is supported, imbalance it"
+if [ -d per_cpu/cpu0 ]; then
+ cd per_cpu/cpu0
+ rb_size_test
+fi
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