ftrace
cd /sys/kernel/debug/tracing
echo 1 > events/tlb/enable
echo 1 > events/sched/enable
echo 1 > tracing_on
cat trace_pipe > /tmp/trace.log
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cd /sys/kernel/debug/tracing
echo 1 > events/tlb/enable
echo 1 > events/sched/enable
echo 1 > tracing_on
cat trace_pipe > /tmp/trace.log