ftracetest: Add kprobes on ftrace testcase

#!/bin/sh

# description: Kprobe dynamic event with function tracer

[ -f kprobe_events ] || exit_unsupported # this is configurable

grep function available_tracers || exit_unsupported # this is configurable

# prepare

echo nop > current_tracer

echo do_fork > set_ftrace_filter

echo 0 > events/enable

echo > kprobe_events

echo 'p:testprobe do_fork' > kprobe_events

# kprobe on / ftrace off

echo 1 > events/kprobes/testprobe/enable

echo > trace

( echo "forked")

grep testprobe trace

! grep 'do_fork <-' trace

# kprobe on / ftrace on

echo function > current_tracer

echo > trace

( echo "forked")

grep testprobe trace

grep 'do_fork <-' trace

# kprobe off / ftrace on

echo 0 > events/kprobes/testprobe/enable

echo > trace

( echo "forked")

! grep testprobe trace

grep 'do_fork <-' trace

# kprobe on / ftrace on

echo 1 > events/kprobes/testprobe/enable

echo function > current_tracer

echo > trace

( echo "forked")

grep testprobe trace

grep 'do_fork <-' trace

# kprobe on / ftrace off

echo nop > current_tracer

echo > trace

( echo "forked")

grep testprobe trace

! grep 'do_fork <-' trace

# cleanup

echo nop > current_tracer

echo > set_ftrace_filter

echo 0 > events/kprobes/testprobe/enable

echo > kprobe_events

echo > trace