From mboxrd@z Thu Jan  1 00:00:00 1970
From: mhiramat@kernel.org (Masami Hiramatsu)
Date: Sat, 14 Jul 2018 01:28:44 +0900
Subject: [PATCH 3/3] selftests/ftrace: Add snapshot and tracing_on test case
In-Reply-To: <153149923649.11274.14970833360963898112.stgit@devbox>
References: <153149923649.11274.14970833360963898112.stgit@devbox>
Message-ID: <153149932412.11274.15289227592627901488.stgit@devbox>
Content-Type: text/plain; charset="UTF-8"
Message-ID: <20180713162844.T9yAKJsPOhEWHGFvd0Xs3nd_9FsNFsdvy1uVCt0ZTQ8@z>

Add a testcase for checking snapshot and tracing_on
relationship. This ensures that the snapshotting doesn't
affect current tracing on/off settings.

Signed-off-by: Masami Hiramatsu <mhiramat at kernel.org>
Cc: Steven Rostedt <rostedt at goodmis.org>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Shuah Khan <shuah at kernel.org>
Cc: linux-kselftest at vger.kernel.org
---
 .../selftests/ftrace/test.d/00basic/snapshot.tc    |   28 ++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/snapshot.tc

diff --git a/tools/testing/selftests/ftrace/test.d/00basic/snapshot.tc b/tools/testing/selftests/ftrace/test.d/00basic/snapshot.tc
new file mode 100644
index 000000000000..3b1f45e13a2e
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/00basic/snapshot.tc
@@ -0,0 +1,28 @@
+#!/bin/sh
+# description: Snapshot and tracing setting
+# flags: instance
+
+[ ! -f snapshot ] && exit_unsupported
+
+echo "Set tracing off"
+echo 0 > tracing_on
+
+echo "Allocate and take a snapshot"
+echo 1 > snapshot
+
+# Since trace buffer is empty, snapshot is also empty, but allocated
+grep -q "Snapshot is allocated" snapshot
+
+echo "Ensure keep tracing off"
+test `cat tracing_on` -eq 0
+
+echo "Set tracing on"
+echo 1 > tracing_on
+
+echo "Take a snapshot again"
+echo 1 > snapshot
+
+echo "Ensure keep tracing on"
+test `cat tracing_on` -eq 1
+
+exit 0

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