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    Subject[PATCH 5.13 748/800] selftests/ftrace: fix event-no-pid on 1-core machine
    Date
    From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

    [ 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>
    ---
    .../testing/selftests/ftrace/test.d/event/event-no-pid.tc | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc b/tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc
    index e6eb78f0b954..9933ed24f901 100644
    --- a/tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc
    +++ b/tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc
    @@ -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`
    --
    2.30.2


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