2 # SPDX-License-Identifier: GPL-2.0
3 # description: ftrace - Max stack tracer
4 # Test the basic function of max-stack usage tracing
6 if [ ! -f stack_trace ]; then
7 echo "Max stack tracer is not supported - please make CONFIG_STACK_TRACER=y"
11 check_filter_file stack_trace_filter
13 echo > stack_trace_filter
14 echo 0 > stack_max_size
15 echo 1 > /proc/sys/kernel/stack_tracer_enabled
17 : "Fork and wait for the first entry become !lock"
19 while [ $timeout -ne 0 ]; do
21 FL=`grep " 0)" stack_trace`
22 echo $FL | grep -q "lock" || break;
23 timeout=$((timeout - 1))
25 echo 0 > /proc/sys/kernel/stack_tracer_enabled
27 echo '*lock*' > stack_trace_filter
28 test `cat stack_trace_filter | wc -l` -eq `grep lock stack_trace_filter | wc -l`
30 echo 0 > stack_max_size
31 echo 1 > /proc/sys/kernel/stack_tracer_enabled
33 : "Fork and always the first entry including lock"
35 while [ $timeout -ne 0 ]; do
37 FL=`grep " 0)" stack_trace`
38 echo $FL | grep -q "lock"
39 timeout=$((timeout - 1))
41 echo 0 > /proc/sys/kernel/stack_tracer_enabled