tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc

   1 #!/bin/sh
   2 # description: Kprobe dynamic event with function tracer
   3
   4 [ -f kprobe_events ] || exit_unsupported # this is configurable
   5 grep function available_tracers || exit_unsupported # this is configurable
   6
   7 # prepare
   8 echo nop > current_tracer
   9 echo _do_fork > set_ftrace_filter
  10 echo 0 > events/enable
  11 echo > kprobe_events
  12 echo 'p:testprobe _do_fork' > kprobe_events
  13
  14 # kprobe on / ftrace off
  15 echo 1 > events/kprobes/testprobe/enable
  16 echo > trace
  17 ( echo "forked")
  18 grep testprobe trace
  19 ! grep '_do_fork <-' trace
  20
  21 # kprobe on / ftrace on
  22 echo function > current_tracer
  23 echo > trace
  24 ( echo "forked")
  25 grep testprobe trace
  26 grep '_do_fork <-' trace
  27
  28 # kprobe off / ftrace on
  29 echo 0 > events/kprobes/testprobe/enable
  30 echo > trace
  31 ( echo "forked")
  32 ! grep testprobe trace
  33 grep '_do_fork <-' trace
  34
  35 # kprobe on / ftrace on
  36 echo 1 > events/kprobes/testprobe/enable
  37 echo function > current_tracer
  38 echo > trace
  39 ( echo "forked")
  40 grep testprobe trace
  41 grep '_do_fork <-' trace
  42
  43 # kprobe on / ftrace off
  44 echo nop > current_tracer
  45 echo > trace
  46 ( echo "forked")
  47 grep testprobe trace
  48 ! grep '_do_fork <-' trace
  49
  50 # cleanup
  51 echo nop > current_tracer
  52 echo > set_ftrace_filter
  53 echo 0 > events/kprobes/testprobe/enable
  54 echo > kprobe_events
  55 echo > trace