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#!/bin/sh
# description: ftrace - function graph filters
# Make sure that function graph filtering works
if ! grep -q function_graph available_tracers; then
echo "no function graph tracer configured"
exit_unsupported
fi
do_reset() {
reset_tracer
enable_tracing
clear_trace
}
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
enable_tracing
sleep 1
# search for functions (has "()" on the line), and make sure
# that only the schedule function was found
count=`cat trace | grep '()' | grep -v schedule | wc -l`
if [ $count -ne 0 ]; then
fail "Graph filtering not working by itself?"
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
do_reset
exit 0
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