On Wed, 23 Jun 2021 09:04:31 +0200
Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx> wrote:
> When running event-no-pid test on a 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]
Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Shua, do you want to take this?
-- Steve
>
> Schedule a simple sleep task to be sure that some other process events
> get recorder.
>
> Fixes: ebed9628f5c2 ("selftests/ftrace: Add test to test new set_event_notrace_pid file")
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
> ---
> .../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`
