From: Masami Hiramatsu mhiramat@kernel.org

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@devbo...

Cc: Tom Zanussi tom.zanussi@linux.intel.com Cc: Hiraku Toyooka hiraku.toyooka@cybertrust.co.jp Signed-off-by: Masami Hiramatsu mhiramat@kernel.org Cc: Ingo Molnar mingo@redhat.com Cc: Shuah Khan shuah@kernel.org Cc: linux-kselftest@vger.kernel.org Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org --- .../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