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
  7do_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
 17fail() { #msg
 18    cat trace
 19    do_reset
 20    echo $1
 21    exit_fail
 22}
 23
 24count_pid() {
 25    pid=$@
 26    cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep $pid | wc -l
 27}
 28
 29count_no_pid() {
 30    pid=$1
 31    cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep -v $pid | wc -l
 32}
 33
 34enable_system() {
 35    system=$1
 36
 37    if [ -d events/$system ]; then
 38	echo 1 > events/$system/enable
 39    fi
 40}
 41
 42enable_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
 60other_task() {
 61    sleep .001 || usleep 1 || sleep 1
 62}
 63
 64echo 0 > options/event-fork
 65
 66do_reset
 67
 68read mypid rest < /proc/self/stat
 69
 70echo $mypid > set_event_notrace_pid
 71grep -q $mypid set_event_notrace_pid
 72
 73enable_events
 74
 75yield
 76
 77echo 0 > tracing_on
 78
 79cnt=`count_pid $mypid`
 80if [ $cnt -ne 0 ]; then
 81    fail "Filtered out task has events"
 82fi
 83
 84cnt=`count_no_pid $mypid`
 85if [ $cnt -eq 0 ]; then
 86    fail "No other events were recorded"
 87fi
 88
 89do_reset
 90
 91echo $mypid > set_event_notrace_pid
 92echo 1 > options/event-fork
 93
 94enable_events
 95
 96yield &
 97child=$!
 98echo "child = $child"
 99wait $child
100
101# Be sure some other events will happen for small systems (e.g. 1 core)
102other_task
103
104echo 0 > tracing_on
105
106cnt=`count_pid $mypid`
107if [ $cnt -ne 0 ]; then
108    fail "Filtered out task has events"
109fi
110
111cnt=`count_pid $child`
112if [ $cnt -ne 0 ]; then
113    fail "Child of filtered out taskhas events"
114fi
115
116cnt=`count_no_pid $mypid`
117if [ $cnt -eq 0 ]; then
118    fail "No other events were recorded"
119fi
120
121do_reset
122
123exit 0