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|
#!/bin/sh
# description: ftrace - function graph filters with stack tracer
# Make sure that function graph filtering works, and is not
# affected by other tracers enabled (like stack tracer)
if ! grep -q function_graph available_tracers; then
echo "no function graph tracer configured"
exit_unsupported
fi
if [ ! -f set_ftrace_filter ]; then
echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
exit_unsupported
fi
do_reset() {
reset_tracer
echo 0 > /proc/sys/kernel/stack_tracer_enabled
enable_tracing
clear_trace
echo > set_ftrace_filter
}
fail() { # msg
do_reset
echo $1
exit -1
}
disable_tracing
clear_trace;
# filter something, schedule is always good
if ! echo "schedule" > set_ftrace_filter; then
# test for powerpc 64
if ! echo ".schedule" > set_ftrace_filter; then
fail "can not enable schedule filter"
fi
fi
echo function_graph > current_tracer
if [ ! -f stack_trace ]; then
echo "Stack tracer not configured"
do_reset
exit_unsupported;
fi
echo "Now testing with stack tracer"
echo 1 > /proc/sys/kernel/stack_tracer_enabled
disable_tracing
clear_trace
enable_tracing
sleep 1
count=`cat trace | grep '()' | grep -v schedule | wc -l`
if [ $count -ne 0 ]; then
fail "Graph filtering not working with stack tracer?"
fi
# Make sure we did find something
count=`cat trace | grep 'schedule()' | wc -l`
if [ $count -eq 0 ]; then
fail "No schedule traces found?"
fi
echo 0 > /proc/sys/kernel/stack_tracer_enabled
clear_trace
sleep 1
count=`cat trace | grep '()' | grep -v schedule | wc -l`
if [ $count -ne 0 ]; then
fail "Graph filtering not working after stack tracer disabled?"
fi
count=`cat trace | grep 'schedule()' | wc -l`
if [ $count -eq 0 ]; then
fail "No schedule traces found?"
fi
do_reset
exit 0
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