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Commit 43bb45da authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
Browse files

selftests: ftrace: Add a selftest to test event enable/disable func trigger 



This adds a test to enable and disable trace events via the function
triggers. It tests enabling and disabling the sched:sched_switch event via
the the event_enable and event_disable function triggers attached to the
schedule() kernel function.

The test does the following:

 o disable all events

 o disables or enables the sched_switch event

 o writes schedule:event_enable/disable:sched:sched_switch into set_ftrace_filter

 o 5 times it checks to make sure:

    . Writes 0/1 into the sched_switch/enable

    . Checks that the sched_switch/enable goes back to 1/0

 o Resets the events

 o writes schedule:event_enable/disable:sched:sched_switch:3 into set_ftrace_filter

 o Does a loop of 3 to see that sched_switch/enable file gets updated

 o Makes sure the sched_switch/enable stops getting updated

Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 8e5e19c1

tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc

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+113 −0
Original line number Original line Diff line number Diff line 
#!/bin/sh

# description: ftrace - test for function event triggers

#

# Ftrace allows to add triggers to functions, such as enabling or disabling

# tracing, enabling or disabling trace events, or recording a stack trace

# within the ring buffer.

#

# This test is designed to test event triggers

#



# The triggers are set within the set_ftrace_filter file

if [ ! -f set_ftrace_filter ]; then

    echo "set_ftrace_filter not found? Is dynamic ftrace not set?"

    exit_unsupported

fi



do_reset() {

    reset_ftrace_filter

    reset_tracer

    disable_events

    clear_trace

    enable_tracing

}



fail() { # mesg

    do_reset

    echo $1

    exit $FAIL

}



SLEEP_TIME=".1"



do_reset



echo "Testing function probes with events:"



EVENT="sched:sched_switch"

EVENT_ENABLE="events/sched/sched_switch/enable"



cnt_trace() {

    grep -v '^#' trace | wc -l

}



test_event_enabled() {

    val=$1



    e=`cat $EVENT_ENABLE`

    if [ "$e" != $val ]; then

	echo "Expected $val but found $e"

	exit -1

    fi

}



run_enable_disable() {

    enable=$1			# enable

    Enable=$2			# Enable

    check_disable=$3		# 0

    check_enable_star=$4	# 1*

    check_disable_star=$5	# 0*



    cnt=`cnt_trace`

    if [ $cnt -ne 0 ]; then

	fail "Found junk in trace file"

    fi



    echo "$Enable event all the time"



    echo $check_disable > $EVENT_ENABLE

    sleep $SLEEP_TIME



    test_event_enabled $check_disable



    echo "schedule:${enable}_event:$EVENT" > set_ftrace_filter



    echo " make sure it works 5 times"



    for i in `seq 5`; do

	sleep $SLEEP_TIME

	echo "  test $i"

	test_event_enabled $check_enable_star



	echo $check_disable > $EVENT_ENABLE

    done

    sleep $SLEEP_TIME

    echo " make sure it's still works"

    test_event_enabled $check_enable_star



    reset_ftrace_filter



    echo " make sure it only works 3 times"



    echo $check_disable > $EVENT_ENABLE

    sleep $SLEEP_TIME



    echo "schedule:${enable}_event:$EVENT:3" > set_ftrace_filter



    for i in `seq 3`; do

	sleep $SLEEP_TIME

	echo "  test $i"

	test_event_enabled $check_enable_star



	echo $check_disable > $EVENT_ENABLE

    done



    sleep $SLEEP_TIME

    echo " make sure it stop working"

    test_event_enabled $check_disable_star



    do_reset

}



run_enable_disable enable Enable 0 "1*" "0*"

run_enable_disable disable Disable 1 "0*" "1*"