From: gregkh@linuxfoundation.org (Greg Kroah-Hartman) Date: Mon, 3 Sep 2018 18:55:40 +0200 Subject: [PATCH 4.14 054/165] selftests/ftrace: Add snapshot and tracing_on test case In-Reply-To: <20180903165655.003605184@linuxfoundation.org> References: <20180903165655.003605184@linuxfoundation.org> Message-ID: <20180903165657.845228106@linuxfoundation.org> Content-Type: text/plain; charset="UTF-8" Message-ID: <20180903165540.FNx-3DVnec47aAR1nrP5NdLhiPR02QO_eb66aXG60LA@z> 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Masami Hiramatsu [ Upstream commit 82f4f3e69c5c29bce940dd87a2c0f16c51d48d17 ] Add a testcase for checking snapshot and tracing_on relationship. This ensures that the snapshotting doesn't affect current tracing on/off settings. Link: http://lkml.kernel.org/r/153149932412.11274.15289227592627901488.stgit at devbox Cc: Tom Zanussi Cc: Hiraku Toyooka Signed-off-by: Masami Hiramatsu Cc: Ingo Molnar Cc: Shuah Khan Cc: linux-kselftest at vger.kernel.org Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- tools/testing/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 --- /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