I am currently using ftrace to trace a variety of events on the local system both within my application and the graphics drivers. But, this is a multi-computer setup. And I'm trying to trace things locally. I know precisely when an event happened on a remote computer relative to my current time in microseconds. I.e. "This event happened 2,385us ago." but I can't figure out a way to log into trace_marker such that this offset is recognized by systems that ingest the ftrace logs.
How can I modify the time an event in ftrace happened in? Specifically how can I say "this event actually happened XXXus ago.