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: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-04-17 17:33:50 -04:00
parent 8e5e19c1b9
commit 43bb45da82
1 changed files with 113 additions and 0 deletions

View File

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#!/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*"