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author | Masami Hiramatsu <mhiramat@kernel.org> | 2018-08-30 23:22:49 +0900 |
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committer | Shuah Khan (Samsung OSG) <shuah@kernel.org> | 2018-10-24 14:49:36 -0600 |
commit | 47c509d30db4cef11a406f87279633cd21380163 (patch) | |
tree | 170cb46ec258066d7944b0d691159e656d0b7b0b /tools/testing/selftests/ftrace | |
parent | 5b56a07b9c461bb4db26797c82d6ac3be0f83a94 (diff) | |
download | linux-47c509d30db4cef11a406f87279633cd21380163.tar.gz linux-47c509d30db4cef11a406f87279633cd21380163.tar.bz2 linux-47c509d30db4cef11a406f87279633cd21380163.zip |
selftests/ftrace: Add max stack tracer testcase
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>
Diffstat (limited to 'tools/testing/selftests/ftrace')
-rw-r--r-- | tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc new file mode 100644 index 000000000000..b414f0e3c646 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc @@ -0,0 +1,39 @@ +#!/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 |