#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: ftrace - function graph filters
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# Make sure that function graph filtering works
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if ! grep -q function_graph available_tracers; then
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echo "no function graph tracer configured"
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exit_unsupported
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fi
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do_reset() {
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reset_tracer
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enable_tracing
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clear_trace
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}
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fail() { # msg
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do_reset
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echo $1
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exit_fail
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}
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disable_tracing
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clear_trace
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# filter something, schedule is always good
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if ! echo "schedule" > set_ftrace_filter; then
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# test for powerpc 64
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if ! echo ".schedule" > set_ftrace_filter; then
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fail "can not enable schedule filter"
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fi
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fi
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echo function_graph > current_tracer
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enable_tracing
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sleep 1
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# search for functions (has "()" on the line), and make sure
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# that only the schedule function was found
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count=`cat trace | grep '()' | grep -v schedule | wc -l`
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if [ $count -ne 0 ]; then
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fail "Graph filtering not working by itself?"
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fi
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# Make sure we did find something
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count=`cat trace | grep 'schedule()' | wc -l`
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if [ $count -eq 0 ]; then
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fail "No schedule traces found?"
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fi
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do_reset
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exit 0
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