Current event/toplevel-enable.tc checking the trace
buffer by dumping all events while recording events.
However, this makes system very busy.
To reduce this overhead comes from reading trace buffer
and recording trace buffer, use head instead of cat
and stop tracing while reading.
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
---
.../ftrace/test.d/event/toplevel-enable.tc | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc b/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc
index 0bb5df3..15e2d3f 100644
--- a/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc
+++ b/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc
@@ -28,7 +28,9 @@ echo '*:*' > set_event
yield
-count=`cat trace | grep -v ^# | wc -l`
+echo 0 > tracing_on
+
+count=`head -n 128 trace | grep -v ^# | wc -l`
if [ $count -eq 0 ]; then
fail "none of events are recorded"
fi
@@ -36,10 +38,12 @@ fi
do_reset
echo 1 > events/enable
+echo 1 > tracing_on
yield
-count=`cat trace | grep -v ^# | wc -l`
+echo 0 > tracing_on
+count=`head -n 128 trace | grep -v ^# | wc -l`
if [ $count -eq 0 ]; then
fail "none of events are recorded"
fi
--
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