From: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
To: Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>, Shuah Khan <shuah@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] selftests/ftrace: fix event-no-pid on 1-core machine
Date: Wed, 23 Jun 2021 09:04:31 +0200 [thread overview]
Message-ID: <20210623070431.16592-1-krzysztof.kozlowski@canonical.com> (raw)
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]
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@canonical.com>
---
.../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`
--
2.27.0
next reply other threads:[~2021-06-23 7:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-23 7:04 Krzysztof Kozlowski [this message]
2021-06-23 12:52 ` [PATCH] selftests/ftrace: fix event-no-pid on 1-core machine Steven Rostedt
2021-06-23 13:36 ` Krzysztof Kozlowski
2021-06-23 13:39 ` Steven Rostedt
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