diff mbox series

[v3,20/28] selftests/ftrace: Add ringbuffer size changing testcase

Message ID 153563891312.29700.7554628761200928605.stgit@devbox (mailing list archive)
State Accepted
Headers show
Series selftests/ftrace: Improve ftracetest with coverage check | expand

Commit Message

Masami Hiramatsu (Google) Aug. 30, 2018, 2:21 p.m. UTC 
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@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.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 mbox series

Patch

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