| #!/bin/sh |
| # SPDX-License-Identifier: GPL-2.0 |
| # description: ftrace - function graph filters |
| |
| # Make sure that function graph filtering works |
| |
| if ! grep -q function_graph available_tracers; then |
| echo "no function graph tracer configured" |
| exit_unsupported |
| fi |
| |
| do_reset() { |
| reset_tracer |
| enable_tracing |
| clear_trace |
| } |
| |
| fail() { # msg |
| do_reset |
| echo $1 |
| exit $FAIL |
| } |
| |
| disable_tracing |
| clear_trace |
| |
| # filter something, schedule is always good |
| if ! echo "schedule" > set_ftrace_filter; then |
| # test for powerpc 64 |
| if ! echo ".schedule" > set_ftrace_filter; then |
| fail "can not enable schedule filter" |
| fi |
| fi |
| |
| echo function_graph > current_tracer |
| enable_tracing |
| sleep 1 |
| # search for functions (has "()" on the line), and make sure |
| # that only the schedule function was found |
| count=`cat trace | grep '()' | grep -v schedule | wc -l` |
| if [ $count -ne 0 ]; then |
| fail "Graph filtering not working by itself?" |
| fi |
| |
| # Make sure we did find something |
| count=`cat trace | grep 'schedule()' | wc -l` |
| if [ $count -eq 0 ]; then |
| fail "No schedule traces found?" |
| fi |
| |
| do_reset |
| |
| exit 0 |
