tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 # description: event tracing - restricts events based on pid notrace filtering
   4 # requires: set_event events/sched set_event_pid set_event_notrace_pid
   5 # flags: instance
   6
   7 do_reset() {
   8     echo > set_event
   9     echo > set_event_pid
  10     echo > set_event_notrace_pid
  11     echo 0 > options/event-fork
  12     echo 0 > events/enable
  13     clear_trace
  14     echo 1 > tracing_on
  15 }
  16
  17 fail() { #msg
  18     cat trace
  19     do_reset
  20     echo $1
  21     exit_fail
  22 }
  23
  24 count_pid() {
  25     pid=$@
  26     cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep $pid | wc -l
  27 }
  28
  29 count_no_pid() {
  30     pid=$1
  31     cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep -v $pid | wc -l
  32 }
  33
  34 enable_system() {
  35     system=$1
  36
  37     if [ -d events/$system ]; then
  38         echo 1 > events/$system/enable
  39     fi
  40 }
  41
  42 enable_events() {
  43     echo 0 > tracing_on
  44     # Enable common groups of events, as all events can allow for
  45     # events to be traced via scheduling that we don't care to test.
  46     enable_system syscalls
  47     enable_system rcu
  48     enable_system block
  49     enable_system exceptions
  50     enable_system irq
  51     enable_system net
  52     enable_system power
  53     enable_system signal
  54     enable_system sock
  55     enable_system timer
  56     enable_system thermal
  57     echo 1 > tracing_on
  58 }
  59
  60 echo 0 > options/event-fork
  61
  62 do_reset
  63
  64 read mypid rest < /proc/self/stat
  65
  66 echo $mypid > set_event_notrace_pid
  67 grep -q $mypid set_event_notrace_pid
  68
  69 enable_events
  70
  71 yield
  72
  73 echo 0 > tracing_on
  74
  75 cnt=`count_pid $mypid`
  76 if [ $cnt -ne 0 ]; then
  77     fail "Filtered out task has events"
  78 fi
  79
  80 cnt=`count_no_pid $mypid`
  81 if [ $cnt -eq 0 ]; then
  82     fail "No other events were recorded"
  83 fi
  84
  85 do_reset
  86
  87 echo $mypid > set_event_notrace_pid
  88 echo 1 > options/event-fork
  89
  90 enable_events
  91
  92 yield &
  93 child=$!
  94 echo "child = $child"
  95 wait $child
  96
  97 echo 0 > tracing_on
  98
  99 cnt=`count_pid $mypid`
 100 if [ $cnt -ne 0 ]; then
 101     fail "Filtered out task has events"
 102 fi
 103
 104 cnt=`count_pid $child`
 105 if [ $cnt -ne 0 ]; then
 106     fail "Child of filtered out taskhas events"
 107 fi
 108
 109 cnt=`count_no_pid $mypid`
 110 if [ $cnt -eq 0 ]; then
 111     fail "No other events were recorded"
 112 fi
 113
 114 do_reset
 115
 116 exit 0