add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/perf/Documentation/perf-mem.txt
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@@ -82,7 +82,7 @@
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 	Be more verbose (show counter open errors, etc)
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 --ldlat <n>::
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-	Specify desired latency for loads event.
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+	Specify desired latency for loads event. (x86 only)
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 In addition, for report all perf report options are valid, and for record
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 all perf record options.