Commit 132001e9 authored by Masami Hiramatsu (Google)'s avatar Masami Hiramatsu (Google)
Browse files

selftests/ftrace: Add a testcase for fprobe events on module 

Add a testcase for fprobe events on module, which unloads a kernel
module on which fprobe events are probing and ensure the ftrace
hash map is cleared correctly.

Link: https://lore.kernel.org/all/177669369564.132053.623527664540176496.stgit@mhiramat.tok.corp.google.com/



Signed-off-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
parent 476c5bba

tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe_module.tc

0 → 100644
+87 −0
Original line number Diff line number Diff line 
#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# description: Generic dynamic event - add/remove fprobe events on module

# requires: dynamic_events "f[:[<group>/][<event>]] <func-name>[%return] [<args>]":README enabled_functions



rmmod trace-events-sample ||:

if ! modprobe trace-events-sample ; then

  echo "No trace-events sample module - please make CONFIG_SAMPLE_TRACE_EVENTS=m"

  exit_unresolved;

fi

trap "lsmod | grep -q trace_events_sample && rmmod trace-events-sample" EXIT



echo 0 > events/enable

echo > dynamic_events



FUNC1='foo_bar*'

FUNC2='vfs_read'



:;: "Add an event on the test module" ;:

echo "f:test1 $FUNC1" >> dynamic_events

echo 1 > events/fprobes/test1/enable



:;: "Ensure it is enabled" ;:

funcs=`cat enabled_functions | wc -l`

test $funcs -ne 0



:;: "Check the enabled_functions is cleared on unloading" ;:

rmmod trace-events-sample

funcs=`cat enabled_functions | wc -l`

test $funcs -eq 0



:;: "Check it is kept clean" ;:

modprobe trace-events-sample

echo 1 > events/fprobes/test1/enable || echo "OK"

funcs=`cat enabled_functions | wc -l`

test $funcs -eq 0



:;: "Add another event not on the test module" ;:

echo "f:test2 $FUNC2" >> dynamic_events

echo 1 > events/fprobes/test2/enable



:;: "Ensure it is enabled" ;:

ofuncs=`cat enabled_functions | wc -l`

test $ofuncs -ne 0



:;: "Disable and remove the first event"

echo 0 > events/fprobes/test1/enable

echo "-:fprobes/test1" >> dynamic_events

funcs=`cat enabled_functions | wc -l`

test $ofuncs -eq $funcs



:;: "Disable and remove other events" ;:

echo 0 > events/fprobes/enable

echo > dynamic_events

funcs=`cat enabled_functions | wc -l`

test $funcs -eq 0



rmmod trace-events-sample



:;: "Add events on kernel and test module" ;:

modprobe trace-events-sample

echo "f:test1 $FUNC1" >> dynamic_events

echo 1 > events/fprobes/test1/enable

echo "f:test2 $FUNC2" >> dynamic_events

echo 1 > events/fprobes/test2/enable

ofuncs=`cat enabled_functions | wc -l`

test $ofuncs -ne 0



:;: "Unload module (ftrace entry should be removed)" ;:

rmmod trace-events-sample

funcs=`cat enabled_functions | wc -l`

test $funcs -ne 0

test $ofuncs -ne $funcs



:;: "Disable and remove core-kernel fprobe event" ;:

echo 0 > events/fprobes/test2/enable

echo "-:fprobes/test2" >> dynamic_events



:;: "Ensure ftrace is disabled." ;:

funcs=`cat enabled_functions | wc -l`

test $funcs -eq 0



echo 0 > events/fprobes/enable

echo > dynamic_events



trap "" EXIT

clear_trace