Messages in this thread | | | Date | Fri, 2 Dec 2016 11:08:45 +0000 | From | Will Deacon <> | Subject | Re: [PATCH] trace: extend trace_clock to support arch_arm clock counter |
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On Fri, Dec 02, 2016 at 01:44:55PM +0530, Srinivas Ramana wrote: > Extend the trace_clock to support the arch timer cycle > counter so that we can get the monotonic cycle count > in the traces. This will help in correlating the traces with the > timestamps/events in other subsystems in the soc which share > this common counter for driving their timers.
I'm not sure I follow this reasoning. What's wrong with nanoseconds? In particular, the "perf" trace_clock hangs off sched_clock, which should be backed by the architected counter anyway. What does the cycle counter in isolation tell you, given that the frequency isn't architected?
I think I'm missing something here.
Will
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