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