[SRU][G][H][I][UNSTABLE][PATCH 1/1] selftests/ftrace: fix event-no-pid on 1-core machine
Krzysztof Kozlowski
krzysztof.kozlowski at canonical.com
Mon Jul 5 15:47:33 UTC 2021
BugLink: https://bugs.launchpad.net/bugs/1927749
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 at canonical.com>
Acked-by: Steven Rostedt (VMware) <rostedt at goodmis.org>
Signed-off-by: Shuah Khan <skhan at linuxfoundation.org>
(cherry picked from commit 07b60713b57a8f952d029a2b6849d003d9c16108)
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski at 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
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