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ftracetest: Add kprobes on ftrace testcase

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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: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Heiko Carstens 2014-10-20 12:52:02 +02:00 committed by Steven Rostedt
parent e7dbb48958
commit d20058f674
1 changed files with 55 additions and 0 deletions
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55
tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc Normal file
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#!/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