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kernel
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linux
selftests/ftrace: Add test to test new set_event_notrace_pid file
A new file was added to the tracing directory that will allow a user to
place a PID into it and the task associated to that PID will not have its
events traced. If the event-fork option is enabled, then neither will the
children of that task have its events traced.
Cc: linux-kselftest@vger.kernel.org
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc
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tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc
···
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: event tracing - restricts events based on pid notrace filtering
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# flags: instance
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do_reset() {
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echo > set_event
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echo > set_event_pid
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echo > set_event_notrace_pid
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echo 0 > options/event-fork
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echo 0 > events/enable
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clear_trace
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echo 1 > tracing_on
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}
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fail() { #msg
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cat trace
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do_reset
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echo $1
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exit_fail
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}
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count_pid() {
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pid=$@
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cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep $pid | wc -l
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}
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count_no_pid() {
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pid=$1
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cat trace | grep -v '^#' | sed -e 's/[^-]*-\([0-9]*\).*/\1/' | grep -v $pid | wc -l
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}
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enable_system() {
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system=$1
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if [ -d events/$system ]; then
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echo 1 > events/$system/enable
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fi
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}
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enable_events() {
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echo 0 > tracing_on
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# Enable common groups of events, as all events can allow for
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# events to be traced via scheduling that we don't care to test.
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enable_system syscalls
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enable_system rcu
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enable_system block
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enable_system exceptions
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enable_system irq
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enable_system net
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enable_system power
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enable_system signal
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enable_system sock
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enable_system timer
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enable_system thermal
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echo 1 > tracing_on
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}
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if [ ! -f set_event -o ! -d events/sched ]; then
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echo "event tracing is not supported"
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exit_unsupported
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fi
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if [ ! -f set_event_pid -o ! -f set_event_notrace_pid ]; then
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echo "event pid notrace filtering is not supported"
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exit_unsupported
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fi
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echo 0 > options/event-fork
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do_reset
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read mypid rest < /proc/self/stat
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echo $mypid > set_event_notrace_pid
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grep -q $mypid set_event_notrace_pid
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enable_events
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yield
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echo 0 > tracing_on
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cnt=`count_pid $mypid`
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if [ $cnt -ne 0 ]; then
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fail "Filtered out task has events"
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fi
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cnt=`count_no_pid $mypid`
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if [ $cnt -eq 0 ]; then
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fail "No other events were recorded"
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fi
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do_reset
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echo $mypid > set_event_notrace_pid
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echo 1 > options/event-fork
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enable_events
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yield &
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child=$!
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echo "child = $child"
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wait $child
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echo 0 > tracing_on
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cnt=`count_pid $mypid`
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if [ $cnt -ne 0 ]; then
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fail "Filtered out task has events"
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fi
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cnt=`count_pid $child`
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if [ $cnt -ne 0 ]; then
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fail "Child of filtered out taskhas events"
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fi
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cnt=`count_no_pid $mypid`
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if [ $cnt -eq 0 ]; then
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fail "No other events were recorded"
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fi
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do_reset
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exit 0