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

   1 #!/bin/sh
   2 # description: ftrace - function graph filters with stack tracer
   3
   4 # Make sure that function graph filtering works, and is not
   5 # affected by other tracers enabled (like stack tracer)
   6
   7 if ! grep -q function_graph available_tracers; then
   8     echo "no function graph tracer configured"
   9     exit_unsupported
  10 fi
  11
  12 if [ ! -f set_ftrace_filter ]; then
  13     echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
  14     exit_unsupported
  15 fi
  16
  17 do_reset() {
  18     reset_tracer
  19     if [ -e /proc/sys/kernel/stack_tracer_enabled ]; then
  20             echo 0 > /proc/sys/kernel/stack_tracer_enabled
  21     fi
  22     enable_tracing
  23     clear_trace
  24     echo > set_ftrace_filter
  25 }
  26
  27 fail() { # msg
  28     do_reset
  29     echo $1
  30     exit $FAIL
  31 }
  32
  33 disable_tracing
  34 clear_trace;
  35
  36 # filter something, schedule is always good
  37 if ! echo "schedule" > set_ftrace_filter; then
  38     # test for powerpc 64
  39     if ! echo ".schedule" > set_ftrace_filter; then
  40         fail "can not enable schedule filter"
  41     fi
  42 fi
  43
  44 echo function_graph > current_tracer
  45
  46 if [ ! -f stack_trace ]; then
  47     echo "Stack tracer not configured"
  48     do_reset
  49     exit_unsupported;
  50 fi
  51
  52 echo "Now testing with stack tracer"
  53
  54 echo 1 > /proc/sys/kernel/stack_tracer_enabled
  55
  56 disable_tracing
  57 clear_trace
  58 enable_tracing
  59 sleep 1
  60
  61 count=`cat trace | grep '()' | grep -v schedule | wc -l`
  62
  63 if [ $count -ne 0 ]; then
  64     fail "Graph filtering not working with stack tracer?"
  65 fi
  66
  67 # Make sure we did find something
  68 count=`cat trace | grep 'schedule()' | wc -l`
  69 if [ $count -eq 0 ]; then
  70     fail "No schedule traces found?"
  71 fi
  72
  73 echo 0 > /proc/sys/kernel/stack_tracer_enabled
  74 clear_trace
  75 sleep 1
  76
  77
  78 count=`cat trace | grep '()' | grep -v schedule | wc -l`
  79
  80 if [ $count -ne 0 ]; then
  81     fail "Graph filtering not working after stack tracer disabled?"
  82 fi
  83
  84 count=`cat trace | grep 'schedule()' | wc -l`
  85 if [ $count -eq 0 ]; then
  86     fail "No schedule traces found?"
  87 fi
  88
  89 do_reset
  90
  91 exit 0