Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 093be89a authored by Namhyung Kim's avatar Namhyung Kim Committed by Steven Rostedt (VMware)
Browse files

selftests: ftrace: Add a testcase for function PID filter 

Like event pid filtering test, add function pid filtering test with the
new "function-fork" option.  It also tests it on an instance directory
so that it can verify the bug related pid filtering on instances.

Link: http://lkml.kernel.org/r/20170417024430.21194-5-namhyung@kernel.org



Cc: Ingo Molnar <mingo@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent d879d0b8

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc

0 → 100644
+98 −0
Original line number Diff line number Diff line 
#!/bin/sh

# description: ftrace - function pid filters



# Make sure that function pid matching filter works.

# Also test it on an instance directory



if ! grep -q function available_tracers; then

    echo "no function tracer configured"

    exit_unsupported

fi



if [ ! -f set_ftrace_pid ]; then

    echo "set_ftrace_pid not found? Is function tracer not set?"

    exit_unsupported

fi



if [ ! -f set_ftrace_filter ]; then

    echo "set_ftrace_filter not found? Is function tracer not set?"

    exit_unsupported

fi



read PID _ < /proc/self/stat



# default value of function-fork option

orig_value=`grep function-fork trace_options`



do_reset() {

    reset_tracer

    clear_trace

    enable_tracing

    echo > set_ftrace_filter

    echo > set_ftrace_pid



    echo $orig_value > trace_options

}



fail() { # msg

    do_reset

    echo $1

    exit $FAIL

}



yield() {

    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1

}



do_test() {

    disable_tracing



    echo do_execve* > set_ftrace_filter

    echo *do_fork >> set_ftrace_filter



    echo $PID > set_ftrace_pid

    echo function > current_tracer



    # don't allow children to be traced

    echo nofunction-fork > trace_options



    enable_tracing

    yield



    count_pid=`cat trace | grep -v ^# | grep $PID | wc -l`

    count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l`



    # count_other should be 0

    if [ $count_pid -eq 0 -o $count_other -ne 0 ]; then

	fail "PID filtering not working?"

    fi



    disable_tracing

    clear_trace



    # allow children to be traced

    echo function-fork > trace_options



    enable_tracing

    yield



    count_pid=`cat trace | grep -v ^# | grep $PID | wc -l`

    count_other=`cat trace | grep -v ^# | grep -v $PID | wc -l`



    # count_other should NOT be 0

    if [ $count_pid -eq 0 -o $count_other -eq 0 ]; then

	fail "PID filtering not following fork?"

    fi

}



do_test



mkdir instances/foo

cd instances/foo

do_test

cd ../../

rmdir instances/foo



do_reset



exit 0