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Commit d8b39e1d authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
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selftests: ftrace: Add a test to test function triggers to start and stop tracing 



This adds a test to test the function tiggers traceon and traceoff to make
sure that it starts and stops tracing when a function is hit.

The test performs the following:

 o Enables all events

 o Writes schedule:traceoff into set_ftrace_filter

 o Makes sure the tigger exists in the file

 o Makes sure the trace file no longer grows

 o Makes sure that tracing_on is now zero

 o Clears the trace file

 o Makes sure it's still empty

 o Removes the trigger

 o Makes sure tracing is still off (tracing_on is zero)

 o Writes schedule:traceon into set_ftrace_filter

 o Makes sure the trace file is no longer empty

 o Makes sure that tracing_on file is set to one

 o Removes the trigger

 o Makes sure the trigger is no longer there

 o Writes schedule:traceoff:3 into set_ftrace_filter

 o Makes sure that tracing_on turns off

   . Writes 1 into tracing_on

   . Makes sure that it turns off 2 more times

 o Writes 1 into tracing_on

 o Makes sure that tracing_on is still a one

Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 43bb45da

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

0 → 100644
+171 −0
Original line number Diff line number Diff line 
#!/bin/sh

# description: ftrace - test for function traceon/off 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 enabling and disabling tracing 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 enabling disabling tracing:"



cnt_trace() {

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

}



echo '** DISABLE TRACING'

disable_tracing

clear_trace



cnt=`cnt_trace`

if [ $cnt -ne 0 ]; then

    fail "Found junk in trace"

fi





echo '** ENABLE EVENTS'



echo 1 > events/enable



echo '** ENABLE TRACING'

enable_tracing



cnt=`cnt_trace`

if [ $cnt -eq 0 ]; then

   fail "Nothing found in trace"

fi



# powerpc uses .schedule

func="schedule"

x=`grep '^\.schedule$' available_filter_functions | wc -l`

if [ "$x" -eq 1 ]; then

   func=".schedule"

fi



echo '** SET TRACEOFF'



echo "$func:traceoff" > set_ftrace_filter



cnt=`grep schedule set_ftrace_filter | wc -l`

if [ $cnt -ne 1 ]; then

   fail "Did not find traceoff trigger"

fi



cnt=`cnt_trace`

sleep $SLEEP_TIME

cnt2=`cnt_trace`



if [ $cnt -ne $cnt2 ]; then

   fail "Tracing is not stopped"

fi



on=`cat tracing_on`

if [ $on != "0" ]; then

    fail "Tracing is not off"

fi



line1=`cat trace | tail -1`

sleep $SLEEP_TIME

line2=`cat trace | tail -1`



if [ "$line1" != "$line2" ]; then

    fail "Tracing file is still changing"

fi



clear_trace



cnt=`cnt_trace`

if [ $cnt -ne 0 ]; then

    fail "Tracing is still happeing"

fi



echo "!$func:traceoff" >> set_ftrace_filter



cnt=`grep schedule set_ftrace_filter | wc -l`

if [ $cnt -ne 0 ]; then

    fail "traceoff trigger still exists"

fi



on=`cat tracing_on`

if [ $on != "0" ]; then

    fail "Tracing is started again"

fi



echo "$func:traceon" > set_ftrace_filter



cnt=`grep schedule set_ftrace_filter | wc -l`

if [ $cnt -ne 1 ]; then

    fail "traceon trigger not found"

fi



cnt=`cnt_trace`

if [ $cnt -eq 0 ]; then

   fail "Tracing did not start"

fi



on=`cat tracing_on`

if [ $on != "1" ]; then

    fail "Tracing was not enabled"

fi





echo "!$func:traceon" >> set_ftrace_filter



cnt=`grep schedule set_ftrace_filter | wc -l`

if [ $cnt -ne 0 ]; then

   fail "traceon trigger still exists"

fi



check_sleep() {

    val=$1

    sleep $SLEEP_TIME

    cat set_ftrace_filter

    on=`cat tracing_on`

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

	fail "Expected tracing_on to be $val, but it was $on"

    fi

}





echo "$func:traceoff:3" > set_ftrace_filter

check_sleep "0"

echo 1 > tracing_on

check_sleep "0"

echo 1 > tracing_on

check_sleep "0"

echo 1 > tracing_on

check_sleep "1"

echo "!$func:traceoff:0" > set_ftrace_filter



if grep -e traceon -e traceoff set_ftrace_filter; then

    fail "Tracing on and off triggers still exist"

fi



disable_events



exit 0