can direct ftrace to file

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hi all:
usually I use
cat /sys/kernel/debug/tracing/trace
to look the ftrace result.

Is it possible
1. direct trace to some file
2. enable ftrace
3. starting tracing what I interested
4. stop ftrace
5. open the file of #1 I directed

that mean I can see whole trace log from #2 to #4
-- 
Regards,

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