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 if [ ! -f set_ftrace_filter ]; then
  14     echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
  15     exit_unsupported
  16 fi
  17
  18 do_reset() {
  19     reset_tracer
  20     if [ -e /proc/sys/kernel/stack_tracer_enabled ]; then
  21             echo 0 > /proc/sys/kernel/stack_tracer_enabled
  22     fi
  23     enable_tracing
  24     clear_trace
  25     echo > set_ftrace_filter
  26 }
  27
  28 fail() { # msg
  29     do_reset
  30     echo $1
  31     exit $FAIL
  32 }
  33
  34 disable_tracing
  35 clear_trace;
  36
  37 # filter something, schedule is always good
  38 if ! echo "schedule" > set_ftrace_filter; then
  39     # test for powerpc 64
  40     if ! echo ".schedule" > set_ftrace_filter; then
  41         fail "can not enable schedule filter"
  42     fi
  43 fi
  44
  45 echo function_graph > current_tracer
  46
  47 if [ ! -f stack_trace ]; then
  48     echo "Stack tracer not configured"
  49     do_reset
  50     exit_unsupported;
  51 fi
  52
  53 echo "Now testing with stack tracer"
  54
  55 echo 1 > /proc/sys/kernel/stack_tracer_enabled
  56
  57 disable_tracing
  58 clear_trace
  59 enable_tracing
  60 sleep 1
  61
  62 count=`cat trace | grep '()' | grep -v schedule | wc -l`
  63
  64 if [ $count -ne 0 ]; then
  65     fail "Graph filtering not working with stack tracer?"
  66 fi
  67
  68 # Make sure we did find something
  69 count=`cat trace | grep 'schedule()' | wc -l`
  70 if [ $count -eq 0 ]; then
  71     fail "No schedule traces found?"
  72 fi
  73
  74 echo 0 > /proc/sys/kernel/stack_tracer_enabled
  75 clear_trace
  76 sleep 1
  77
  78
  79 count=`cat trace | grep '()' | grep -v schedule | wc -l`
  80
  81 if [ $count -ne 0 ]; then
  82     fail "Graph filtering not working after stack tracer disabled?"
  83 fi
  84
  85 count=`cat trace | grep 'schedule()' | wc -l`
  86 if [ $count -eq 0 ]; then
  87     fail "No schedule traces found?"
  88 fi
  89
  90 do_reset
  91
  92 exit 0