linux-kernel - [PATCH] selftests: ftrace: Use md5sum to take less time of checking logs

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Date:   Tue, 27 Jun 2017 19:28:32 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     linux-kselftest@...r.kernel.org, shuah@...nel.org,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     mhiramat@...nel.org, Ingo Molnar <mingo@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] selftests: ftrace: Use md5sum to take less time of checking logs

Use md5sum so that it takes less time of checking
trace logs update. Since busybox tail/cat takes too
long time to read the trace log, this uses md5sum
to check whether trace log is updated or not.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 .../test.d/ftrace/func_traceonoff_triggers.tc      |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc
index 9cf3852..7a9ab4f 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc
@@ -103,11 +103,11 @@ if [ $on != "0" ]; then
     fail "Tracing is not off"
 fi
 
-line1=`cat trace | tail -1`
+csum1=`md5sum trace`
 sleep $SLEEP_TIME
-line2=`cat trace | tail -1`
+csum2=`md5sum trace`
 
-if [ "$line1" != "$line2" ]; then
+if [ "$csum1" != "$csum2" ]; then
     fail "Tracing file is still changing"
 fi