tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: ftrace - function graph filters with stack tracer
   4
   5 # Make sure that function graph filtering works, and is not
   6 # affected by other tracers enabled (like stack tracer)
   7
   8 if ! grep -q function_graph available_tracers; then
   9     echo "no function graph tracer configured"
  10     exit_unsupported
  11 fi
  12
  13 check_filter_file set_ftrace_filter
  14
  15 do_reset() {
  16     if [ -e /proc/sys/kernel/stack_tracer_enabled ]; then
  17             echo 0 > /proc/sys/kernel/stack_tracer_enabled
  18     fi
  19 }
  20
  21 fail() { # msg
  22     do_reset
  23     echo $1
  24     exit_fail
  25 }
  26
  27 disable_tracing
  28 clear_trace;
  29
  30 # filter something, schedule is always good
  31 if ! echo "schedule" > set_ftrace_filter; then
  32     # test for powerpc 64
  33     if ! echo ".schedule" > set_ftrace_filter; then
  34         fail "can not enable schedule filter"
  35     fi
  36 fi
  37
  38 echo function_graph > current_tracer
  39
  40 if [ ! -f stack_trace ]; then
  41     echo "Stack tracer not configured"
  42     do_reset
  43     exit_unsupported;
  44 fi
  45
  46 echo "Now testing with stack tracer"
  47
  48 echo 1 > /proc/sys/kernel/stack_tracer_enabled
  49
  50 disable_tracing
  51 clear_trace
  52 enable_tracing
  53 sleep 1
  54
  55 count=`cat trace | grep '()' | grep -v schedule | wc -l`
  56
  57 if [ $count -ne 0 ]; then
  58     fail "Graph filtering not working with stack tracer?"
  59 fi
  60
  61 # Make sure we did find something
  62 count=`cat trace | grep 'schedule()' | wc -l`
  63 if [ $count -eq 0 ]; then
  64     fail "No schedule traces found?"
  65 fi
  66
  67 echo 0 > /proc/sys/kernel/stack_tracer_enabled
  68 clear_trace
  69 sleep 1
  70
  71
  72 count=`cat trace | grep '()' | grep -v schedule | wc -l`
  73
  74 if [ $count -ne 0 ]; then
  75     fail "Graph filtering not working after stack tracer disabled?"
  76 fi
  77
  78 count=`cat trace | grep 'schedule()' | wc -l`
  79 if [ $count -eq 0 ]; then
  80     fail "No schedule traces found?"
  81 fi
  82
  83 do_reset
  84
  85 exit 0