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selftests/ftrace: fix event-no-pid on 1-core machine

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[ Upstream commit 07b60713b57a8f952d029a2b6849d003d9c16108 ]

When running event-no-pid test on small machines (e.g. cloud 1-core
instance), other events might not happen:

    + cat trace
    + cnt=0
    + [ 0 -eq 0 ]
    + fail No other events were recorded
    [15] event tracing - restricts events based on pid notrace filtering [FAIL]

Schedule a simple sleep task to be sure that some other process events
get recorded.

Fixes: ebed9628f5c2 ("selftests/ftrace: Add test to test new set_event_notrace_pid file")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2021-06-23 15:43:15 +02:00 committed by Greg Kroah-Hartman
parent 57e49a0bc4
commit 786461739a
1 changed files with 7 additions and 0 deletions
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7
tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc
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@ -57,6 +57,10 @@ enable_events() {
echo 1 > tracing_on
}
other_task() {
sleep .001 || usleep 1 || sleep 1
}
echo 0 > options/event-fork
do_reset
@ -94,6 +98,9 @@ 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`