Commit 579381fc authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Greg Kroah-Hartman

selftests/ftrace: Add snapshot and tracing_on test case

[ 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@devbox

Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Hiraku Toyooka <hiraku.toyooka@cybertrust.co.jp>
Signed-off-by: default avatarMasami 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: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6194fba2
#!/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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