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Commit d20058f6 authored by Heiko Carstens's avatar Heiko Carstens Committed by Steven Rostedt
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ftracetest: Add kprobes on ftrace testcase 

Add a kprobes on ftrace testcase. The testcase verifies that
- enabling and disabling function tracing works on a function which
  already contains a dynamic kprobe
- adding and removing a dynamic kprobe works on a function which is
  already enabled for function tracing

Link: http://lkml.kernel.org/p/1413802323-5297-2-git-send-email-heiko.carstens@de.ibm.com



Acked-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent e7dbb489

tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc

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+55 −0
Original line number Diff line number Diff line 
#!/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