selftests/ftrace: Reduce trace buffer checking overhead (1d0864db) · Commits · 戴 / test

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@kernel.org> Signed-off-by:

Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc

+6 −2

Original line number	Diff line number	Diff line
		@@ -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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