From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

Add a new ftrace test that creates three threads. One that creates and
removes an ftrace instance, one that reads the instance, and one that enables
and disables events in the instance. This is a stress test for accessing and
removing instances at the same time.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 .../ftrace/test.d/instances/instance-event.tc      | 143 +++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/instances/instance-event.tc

diff --git a/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc b/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
new file mode 100644
index 000000000000..5f2abd03f16b
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
@@ -0,0 +1,143 @@
+#!/bin/sh
+# description: Test creation and deletion of trace instances while setting an event
+
+if [ ! -d instances ] ; then
+    echo "no instance directory with this kernel"
+    exit_unsupported;
+fi
+
+fail() { # mesg
+    rmdir foo 2>/dev/null
+    echo $1
+    set -e
+    exit $FAIL
+}
+
+cd instances
+
+# we don't want to fail on error
+set +e
+
+mkdir x
+rmdir x
+result=$?
+
+if [ $result -ne 0 ]; then
+    echo "instance rmdir not supported"
+    exit_unsupported
+fi
+
+instance_slam() {
+        while :; do
+                mkdir foo 2> /dev/null
+                rmdir foo 2> /dev/null
+        done
+}
+
+instance_read() {
+        while :; do
+                cat foo/trace 1> /dev/null 2>&1
+        done
+}
+
+instance_set() {
+        while :; do
+                echo 1 > foo/events/sched/sched_switch
+        done 2> /dev/null
+}
+
+instance_slam &
+p1=$!
+echo $p1
+
+instance_set &
+p2=$!
+echo $p2
+
+instance_read &
+p3=$!
+echo $p3
+
+sleep 1
+
+kill -1 $p3
+kill -1 $p2
+kill -1 $p1
+
+echo "Wait for processes to finish"
+wait $p1 $p2 $p3
+echo "all processes finished, wait for cleanup"
+sleep 1
+
+mkdir foo
+ls foo > /dev/null
+rmdir foo
+if [ -d foo ]; then
+        fail "foo still exists"
+fi
+exit 0
+
+
+
+
+instance_slam() {
+    while :; do
+	mkdir x
+	mkdir y
+	mkdir z
+	rmdir x
+	rmdir y
+	rmdir z
+    done 2>/dev/null
+}
+
+instance_slam &
+x=`jobs -l`
+p1=`echo $x | cut -d' ' -f2`
+echo $p1
+
+instance_slam &
+x=`jobs -l | tail -1`
+p2=`echo $x | cut -d' ' -f2`
+echo $p2
+
+instance_slam &
+x=`jobs -l | tail -1`
+p3=`echo $x | cut -d' ' -f2`
+echo $p3
+
+instance_slam &
+x=`jobs -l | tail -1`
+p4=`echo $x | cut -d' ' -f2`
+echo $p4
+
+instance_slam &
+x=`jobs -l | tail -1`
+p5=`echo $x | cut -d' ' -f2`
+echo $p5
+
+ls -lR >/dev/null
+sleep 1
+
+kill -1 $p1
+kill -1 $p2
+kill -1 $p3
+kill -1 $p4
+kill -1 $p5
+
+echo "Wait for processes to finish"
+wait $p1 $p2 $p3 $p4 $p5
+echo "all processes finished, wait for cleanup"
+
+mkdir x y z
+ls x y z
+rmdir x y z
+for d in x y z; do
+        if [ -d $d ]; then
+                fail "instance $d still exists"
+        fi
+done
+
+set -e
+
+exit 0
-- 
2.8.0.rc3