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

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: Kprobe dynamic event with function tracer
   4
   5 [ -f kprobe_events ] || exit_unsupported # this is configurable
   6 grep "function" available_tracers || exit_unsupported # this is configurable
   7
   8 # prepare
   9 echo nop > current_tracer
  10 echo _do_fork > set_ftrace_filter
  11 echo 'p:testprobe _do_fork' > kprobe_events
  12
  13 # kprobe on / ftrace off
  14 echo 1 > events/kprobes/testprobe/enable
  15 echo > trace
  16 ( echo "forked")
  17 grep testprobe trace
  18 ! grep '_do_fork <-' trace
  19
  20 # kprobe on / ftrace on
  21 echo function > current_tracer
  22 echo > trace
  23 ( echo "forked")
  24 grep testprobe trace
  25 grep '_do_fork <-' trace
  26
  27 # kprobe off / ftrace on
  28 echo 0 > events/kprobes/testprobe/enable
  29 echo > trace
  30 ( echo "forked")
  31 ! grep testprobe trace
  32 grep '_do_fork <-' trace
  33
  34 # kprobe on / ftrace on
  35 echo 1 > events/kprobes/testprobe/enable
  36 echo function > current_tracer
  37 echo > trace
  38 ( echo "forked")
  39 grep testprobe trace
  40 grep '_do_fork <-' trace
  41
  42 # kprobe on / ftrace off
  43 echo nop > current_tracer
  44 echo > trace
  45 ( echo "forked")
  46 grep testprobe trace
  47 ! grep '_do_fork <-' trace