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 other_task() {
  61     sleep .001 || usleep 1 || sleep 1
  62 }
  63
  64 echo 0 > options/event-fork
  65
  66 do_reset
  67
  68 read mypid rest < /proc/self/stat
  69
  70 echo $mypid > set_event_notrace_pid
  71 grep -q $mypid set_event_notrace_pid
  72
  73 enable_events
  74
  75 yield
  76
  77 echo 0 > tracing_on
  78
  79 cnt=`count_pid $mypid`
  80 if [ $cnt -ne 0 ]; then
  81     fail "Filtered out task has events"
  82 fi
  83
  84 cnt=`count_no_pid $mypid`
  85 if [ $cnt -eq 0 ]; then
  86     fail "No other events were recorded"
  87 fi
  88
  89 do_reset
  90
  91 echo $mypid > set_event_notrace_pid
  92 echo 1 > options/event-fork
  93
  94 enable_events
  95
  96 yield &
  97 child=$!
  98 echo "child = $child"
  99 wait $child
 100
 101 # Be sure some other events will happen for small systems (e.g. 1 core)
 102 other_task
 103
 104 echo 0 > tracing_on
 105
 106 cnt=`count_pid $mypid`
 107 if [ $cnt -ne 0 ]; then
 108     fail "Filtered out task has events"
 109 fi
 110
 111 cnt=`count_pid $child`
 112 if [ $cnt -ne 0 ]; then
 113     fail "Child of filtered out taskhas events"
 114 fi
 115
 116 cnt=`count_no_pid $mypid`
 117 if [ $cnt -eq 0 ]; then
 118     fail "No other events were recorded"
 119 fi
 120
 121 do_reset
 122
 123 exit 0