#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: ftrace - function profiler with function tracing
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# There was a bug after a rewrite of the ftrace infrastructure that
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# caused the function_profiler not to be able to run with the function
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# tracer, because the function_profiler used the function_graph tracer
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# and it was assumed the two could not run simultaneously.
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#
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# There was another related bug where the solution to the first bug
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# broke the way filtering of the function tracer worked.
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#
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# This test triggers those bugs on those kernels.
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#
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# We need function_graph and profiling to to run this test
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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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if [ ! -f function_profile_enabled ]; then
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echo "function_profile_enabled not found, function profiling enabled?"
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exit_unsupported
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fi
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fail() { # mesg
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reset_tracer
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echo > set_ftrace_filter
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echo $1
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exit_fail
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}
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echo "Testing function tracer with profiler:"
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echo "enable function tracer"
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echo function > current_tracer
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echo "enable profiler"
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echo 1 > function_profile_enabled
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sleep 1
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echo "Now filter on just schedule"
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echo '*schedule' > set_ftrace_filter
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clear_trace
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echo "Now disable function profiler"
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echo 0 > function_profile_enabled
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sleep 1
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# make sure only schedule functions exist
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echo "testing if only schedule is being traced"
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if grep -v -e '^#' -e 'schedule' trace; then
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fail "more than schedule was found"
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fi
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echo "Make sure schedule was traced"
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if ! grep -e 'schedule' trace > /dev/null; then
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cat trace
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fail "can not find schedule in trace"
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fi
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echo > set_ftrace_filter
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clear_trace
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sleep 1
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echo "make sure something other than scheduler is being traced"
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if ! grep -v -e '^#' -e 'schedule' trace > /dev/null; then
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cat trace
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fail "no other functions besides schedule was found"
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fi
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reset_tracer
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exit 0
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