add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/perf/Documentation/perf-data.txt
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@@ -27,6 +27,9 @@
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 --to-ctf::
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 	Triggers the CTF conversion, specify the path of CTF data directory.
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+--tod::
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+	Convert time to wall clock time.
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+
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 -i::
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 	Specify input perf data file path.
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