#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: ftrace - function graph filters with stack tracer
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# Make sure that function graph filtering works, and is not
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# affected by other tracers enabled (like stack tracer)
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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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if [ ! -f set_ftrace_filter ]; then
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echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
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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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if [ -e /proc/sys/kernel/stack_tracer_enabled ]; then
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echo 0 > /proc/sys/kernel/stack_tracer_enabled
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fi
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enable_tracing
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clear_trace
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echo > set_ftrace_filter
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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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if [ ! -f stack_trace ]; then
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echo "Stack tracer not configured"
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do_reset
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exit_unsupported;
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fi
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echo "Now testing with stack tracer"
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echo 1 > /proc/sys/kernel/stack_tracer_enabled
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disable_tracing
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clear_trace
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enable_tracing
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sleep 1
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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 with stack tracer?"
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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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echo 0 > /proc/sys/kernel/stack_tracer_enabled
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clear_trace
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sleep 1
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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 after stack tracer disabled?"
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fi
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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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