linux-kernel - [PATCH 2/2] kselftests/ftrace: Add a test case for event pid filtering

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Message-Id: <1462891986-3608-2-git-send-email-namhyung@kernel.org>
Date:	Tue, 10 May 2016 23:53:06 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Shuah Khan <shuahkh@....samsung.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-kselftest@...r.kernel.org
Subject: [PATCH 2/2] kselftests/ftrace: Add a test case for event pid filtering

Check event is filtered by set_event_pid and options/event-fork.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 .../selftests/ftrace/test.d/event/event-pid.tc     | 72 ++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/event/event-pid.tc

diff --git a/tools/testing/selftests/ftrace/test.d/event/event-pid.tc b/tools/testing/selftests/ftrace/test.d/event/event-pid.tc
new file mode 100644
index 000000000000..d4ab27b522f8
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/event/event-pid.tc
@@ -0,0 +1,72 @@
+#!/bin/sh
+# description: event tracing - restricts events based on pid
+
+do_reset() {
+    echo > set_event
+    echo > set_event_pid
+    echo 0 > options/event-fork
+    clear_trace
+}
+
+fail() { #msg
+    do_reset
+    echo $1
+    exit $FAIL
+}
+
+yield() {
+    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
+}
+
+if [ ! -f set_event -o ! -d events/sched ]; then
+    echo "event tracing is not supported"
+    exit_unsupported
+fi
+
+if [ ! -f set_event_pid ]; then
+    echo "event pid filtering is not supported"
+    exit_unsupported
+fi
+
+reset_tracer
+do_reset
+
+echo 1 > events/sched/sched_switch/enable
+
+yield
+
+count=`cat trace | grep sched_switch | wc -l`
+if [ $count -eq 0 ]; then
+    fail "sched_switch events are not recorded"
+fi
+
+do_reset
+
+read mypid rest < /proc/self/stat
+
+echo $mypid > set_event_pid
+echo 'sched:sched_switch' > set_event
+
+yield
+
+count=`cat trace | grep sched_switch | grep -v "pid=$mypid" | wc -l`
+if [ $count -ne 0 ]; then
+    fail "sched_switch events from other task are recorded"
+fi
+
+do_reset
+
+echo $mypid > set_event_pid
+echo 1 > options/event-fork
+echo 1 > events/sched/sched_switch/enable
+
+yield
+
+count=`cat trace | grep sched_switch | grep -v "pid=$mypid" | wc -l`
+if [ $count -eq 0 ]; then
+    fail "sched_switch events from other task are not recorded"
+fi
+
+do_reset
+
+exit 0
-- 
2.8.0