tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: ftrace - function profiler with function tracing
   4
   5 # There was a bug after a rewrite of the ftrace infrastructure that
   6 # caused the function_profiler not to be able to run with the function
   7 # tracer, because the function_profiler used the function_graph tracer
   8 # and it was assumed the two could not run simultaneously.
   9 #
  10 # There was another related bug where the solution to the first bug
  11 # broke the way filtering of the function tracer worked.
  12 #
  13 # This test triggers those bugs on those kernels.
  14 #
  15 # We need function_graph and profiling to to run this test
  16 if ! grep -q function_graph available_tracers; then
  17     echo "no function graph tracer configured"
  18     exit_unsupported;
  19 fi
  20
  21 if [ ! -f set_ftrace_filter ]; then
  22     echo "set_ftrace_filter not found? Is dynamic ftrace not set?"
  23     exit_unsupported
  24 fi
  25
  26 if [ ! -f function_profile_enabled ]; then
  27     echo "function_profile_enabled not found, function profiling enabled?"
  28     exit_unsupported
  29 fi
  30
  31 fail() { # mesg
  32     reset_tracer
  33     echo > set_ftrace_filter
  34     echo $1
  35     exit $FAIL
  36 }
  37
  38 echo "Testing function tracer with profiler:"
  39 echo "enable function tracer"
  40 echo function > current_tracer
  41 echo "enable profiler"
  42 echo 1 > function_profile_enabled
  43
  44 sleep 1
  45
  46 echo "Now filter on just schedule"
  47 echo '*schedule' > set_ftrace_filter
  48 clear_trace
  49
  50 echo "Now disable function profiler"
  51 echo 0 > function_profile_enabled
  52
  53 sleep 1
  54
  55 # make sure only schedule functions exist
  56
  57 echo "testing if only schedule is being traced"
  58 if grep -v -e '^#' -e 'schedule' trace; then
  59         fail "more than schedule was found"
  60 fi
  61
  62 echo "Make sure schedule was traced"
  63 if ! grep -e 'schedule' trace > /dev/null; then
  64         cat trace
  65         fail "can not find schedule in trace"
  66 fi
  67
  68 echo > set_ftrace_filter
  69 clear_trace
  70
  71 sleep 1
  72
  73 echo "make sure something other than scheduler is being traced"
  74 if ! grep -v -e '^#' -e 'schedule' trace > /dev/null; then
  75         cat trace
  76         fail "no other functions besides schedule was found"
  77 fi
  78
  79 reset_tracer
  80
  81 exit 0