selftests/ftrace: Limit length in subsystem-enable tests
While sched* events being traced and sched* events continuously happen, "[xx] event tracing - enable/disable with subsystem level files" would not stop as on some slower systems it seems to take forever. Select the first 100 lines of output would be enough to judge whether there are more than 3 types of sched events. Fixes: 815b18ea66d6 ("ftracetest: Add basic event tracing test cases") Cc: stable@vger.kernel.org Signed-off-by: Yuanhe Shu <xiangzao@linux.alibaba.com> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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@ -18,7 +18,7 @@ echo 'sched:*' > set_event
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yield
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count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
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count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
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if [ $count -lt 3 ]; then
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fail "at least fork, exec and exit events should be recorded"
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fi
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@ -29,7 +29,7 @@ echo 1 > events/sched/enable
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yield
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count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
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count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
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if [ $count -lt 3 ]; then
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fail "at least fork, exec and exit events should be recorded"
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fi
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@ -40,7 +40,7 @@ echo 0 > events/sched/enable
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yield
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count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
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count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
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if [ $count -ne 0 ]; then
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fail "any of scheduler events should not be recorded"
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fi
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