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|
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: event tracing - restricts events based on pid notrace filtering
# requires: set_event events/sched set_event_pid set_event_notrace_pid
# flags: instance
do_reset() {
echo > set_event
echo > set_event_pid
echo > set_event_notrace_pid
echo 0 > options/event-fork
echo 0 > events/enable
clear_trace
echo 1 > tracing_on
}
fail() { #msg
cat trace
do_reset
echo $1
exit_fail
}
count_pid() {
pid=$@
cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep $pid | wc -l
}
count_no_pid() {
pid=$1
cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep -v $pid | wc -l
}
enable_system() {
system=$1
if [ -d events/$system ]; then
echo 1 > events/$system/enable
fi
}
enable_events() {
echo 0 > tracing_on
# Enable common groups of events, as all events can allow for
# events to be traced via scheduling that we don't care to test.
enable_system syscalls
enable_system rcu
enable_system block
enable_system exceptions
enable_system irq
enable_system net
enable_system power
enable_system signal
enable_system sock
enable_system timer
enable_system thermal
echo 1 > tracing_on
}
other_task() {
sleep .001 || usleep 1 || sleep 1
}
echo 0 > options/event-fork
do_reset
read mypid rest < /proc/self/stat
echo $mypid > set_event_notrace_pid
grep -q $mypid set_event_notrace_pid
enable_events
yield
echo 0 > tracing_on
cnt=`count_pid $mypid`
if [ $cnt -ne 0 ]; then
fail "Filtered out task has events"
fi
cnt=`count_no_pid $mypid`
if [ $cnt -eq 0 ]; then
fail "No other events were recorded"
fi
do_reset
echo $mypid > set_event_notrace_pid
echo 1 > options/event-fork
enable_events
yield &
child=$!
echo "child = $child"
wait $child
# Be sure some other events will happen for small systems (e.g. 1 core)
other_task
echo 0 > tracing_on
cnt=`count_pid $mypid`
if [ $cnt -ne 0 ]; then
fail "Filtered out task has events"
fi
cnt=`count_pid $child`
if [ $cnt -ne 0 ]; then
fail "Child of filtered out taskhas events"
fi
cnt=`count_no_pid $mypid`
if [ $cnt -eq 0 ]; then
fail "No other events were recorded"
fi
do_reset
exit 0
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