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selftests/ftrace: Add max stack tracer testcase

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Add a testcase for max stack tracer, which checks basic
max stack usage tracing and its filter feature.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
This commit is contained in:
Masami Hiramatsu 2018-08-30 23:22:49 +09:00 committed by Shuah Khan (Samsung OSG)
parent 5b56a07b9c
commit 47c509d30d
1 changed files with 39 additions and 0 deletions
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39
tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc Normal file
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: ftrace - Max stack tracer
# Test the basic function of max-stack usage tracing
if [ ! -f stack_trace ]; then
echo "Max stack tracer is not supported - please make CONFIG_STACK_TRACER=y"
exit_unsupported
fi
echo > stack_trace_filter
echo 0 > stack_max_size
echo 1 > /proc/sys/kernel/stack_tracer_enabled
: "Fork and wait for the first entry become !lock"
timeout=10
while [ $timeout -ne 0 ]; do
( echo "forked" )
FL=`grep " 0)" stack_trace`
echo $FL | grep -q "lock" || break;
timeout=$((timeout - 1))
done
echo 0 > /proc/sys/kernel/stack_tracer_enabled
echo '*lock*' > stack_trace_filter
test `cat stack_trace_filter | wc -l` -eq `grep lock stack_trace_filter | wc -l`
echo 0 > stack_max_size
echo 1 > /proc/sys/kernel/stack_tracer_enabled
: "Fork and always the first entry including lock"
timeout=10
while [ $timeout -ne 0 ]; do
( echo "forked" )
FL=`grep " 0)" stack_trace`
echo $FL | grep -q "lock"
timeout=$((timeout - 1))
done
echo 0 > /proc/sys/kernel/stack_tracer_enabled