Commit 4e78dd6b authored by Masami Hiramatsu (Google)'s avatar Masami Hiramatsu (Google)
Browse files

sefltests/tracing: Add a test for tracepoint events on modules 

Add a test case for tracepoint events on modules. This checks if it can add
and remove the events correctly.

Link: https://lore.kernel.org/all/172397781494.286558.7581515061075998225.stgit@devnote2/



Signed-off-by: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
parent 57a7e6de

tools/testing/selftests/ftrace/config

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ CONFIG_PREEMPT_TRACER=y 
CONFIG_PROBE_EVENTS_BTF_ARGS=y

CONFIG_SAMPLES=y

CONFIG_SAMPLE_FTRACE_DIRECT=m

CONFIG_SAMPLE_TRACE_EVENTS=m

CONFIG_SAMPLE_TRACE_PRINTK=m

CONFIG_SCHED_TRACER=y

CONFIG_STACK_TRACER=y

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

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+61 −0
Original line number Diff line number Diff line 
#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

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

# requires: dynamic_events "t[:[<group>/][<event>]] <tracepoint> [<args>]":README



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 "rmmod trace-events-sample" EXIT



echo 0 > events/enable

echo > dynamic_events



TRACEPOINT1=foo_bar

TRACEPOINT2=foo_bar_with_cond



echo "t:myevent1 $TRACEPOINT1" >> dynamic_events

echo "t:myevent2 $TRACEPOINT2" >> dynamic_events



grep -q myevent1 dynamic_events

grep -q myevent2 dynamic_events

test -d events/tracepoints/myevent1

test -d events/tracepoints/myevent2



echo "-:myevent2" >> dynamic_events



grep -q myevent1 dynamic_events

! grep -q myevent2 dynamic_events



echo > dynamic_events



clear_trace



:;: "Try to put a probe on a tracepoint in non-loaded module" ;:

rmmod trace-events-sample



echo "t:myevent1 $TRACEPOINT1" >> dynamic_events

echo "t:myevent2 $TRACEPOINT2" >> dynamic_events



grep -q myevent1 dynamic_events

grep -q myevent2 dynamic_events

test -d events/tracepoints/myevent1

test -d events/tracepoints/myevent2



echo 1 > events/tracepoints/enable



modprobe trace-events-sample



sleep 2



grep -q "myevent1" trace

grep -q "myevent2" trace



rmmod trace-events-sample

trap "" EXIT



echo 0 > events/tracepoints/enable

echo > dynamic_events

clear_trace